JP2010028957A - Inductor and inductor pole-number switching system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve a structure that strikes a balance between a high torque at lower-speed operation and favorable performance at high-speed operation without causing a large increase of cost, in an inductor. <P>SOLUTION: An induction electric motor 12 serving as an inductor includes a stator 22 having stator windings 28u, 28v and 28w which are three-phase concentrated windings, and a rotor 24 opposing the stator 22. The number of poles can be switched by changing the drive frequencies of currents flowing to the stator windings 28u, 28v and 28w according to magnetomotive force harmonic order components of the stator windings 28u, 28v and 28w of the stator 22. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an induction machine including a stator having three-phase concentrated windings and a rotor facing the stator, and an induction machine pole number switching system.

Conventionally, in a rotating electrical machine such as an induction motor or a synchronous motor, a winding type rotating electrical machine having a stator with a winding is known. For example, Non-Patent Document 1, a stator winding is wound in concentrated winding constituting the stator, the number of slots stator and Z _1, the pole pairs of the rotor and Z _2, the number of phases in the case of the m , A magnet motor having a concentrated winding fractional slot in which q (q = Z ₁ / (2Z ₂ m)), which is the number of slots per phase, is a fraction, and the number of slots Z ₁ is 24, and the poles of the rotor A magnet motor having 28 poles is described. According to such a magnet motor, it has excellent characteristics as a low-speed large-torque motor, and since the concentrated winding coil end is short, the motor size including the coil end can be reduced.

In Non-Patent Document 2, the number of phases is six and the number of poles can be switched between 8 poles and 4 poles using a 6-phase inverter. The frequency for switching the poles is efficient for both 8 poles and 4 poles. A six-phase pole number switching induction motor having a high frequency, that is, 8 poles 100 Hz, 4 poles 50 Hz, is described.
As prior art documents related to the present invention, there are Patent Documents 1 to 3 in addition to Non-Patent Documents 1 and 2.

Shintaro Chinen, two others, “Comparative study of distributed winding PM vernier motor and concentrated winding fraction slot PM motor”, 2006 IEEJ National Conference 5-131, 2006, Volume 5, p. 190 Yasuhiro Tani, 3 others, “Switching the number of poles during high-efficiency operation of a six-phase pole-switching induction motor for EV”, 2005 Annual Conference of the Institute of Electrical Engineers of Japan, 5-137, 2005, Volume 5, p. 190-191 JP-A-8-223999 Japanese Patent Laid-Open No. 11-18382 JP 2002-369468 A

  However, in the case of the concentrated winding fraction slot magnet motor described in Non-Patent Document 1, the number of poles of the motor is determined by the number of poles of the permanent magnet on the rotor side. Although it is sometimes possible to increase the torque, high frequency and high voltage are required during high-speed operation, so that it is difficult to exhibit good electrical performance.

  In the case of the six-phase pole number switching induction motor described in Non-Patent Document 2, it is possible to switch the number of poles of the induction motor, but both armature windings and inverters are required for six phases. Cause the cost to rise significantly. For this reason, it is inferior both in terms of production and practical use compared with a general induction motor that has been conventionally considered. Moreover, since it is necessary to control the inverter for six phases, controllability is complicated.

  Under such circumstances, by enabling switching of the number of poles without causing a significant increase in cost, it is possible to exhibit high torque at low speed operation and to exhibit good performance at high speed operation. Realization of an induction machine that can achieve both is desired. Such induction machines are not disclosed in any of Patent Documents 1 to 3 described above.

  The object of the present invention is to exhibit high torque at low speed operation and good performance at high speed operation without incurring a significant increase in cost in the induction machine and induction machine pole number switching system. It is to realize an induction machine that can achieve both.

  An induction machine according to the present invention is an induction machine including a stator having three-phase concentrated windings and a rotor facing the stator, and a magnetomotive harmonic order component possessed by the concentrated windings of the stator. The induction machine is characterized in that the number of poles can be switched by changing the drive frequency of the current passed through each concentrated winding in accordance with the above. Throughout the specification and claims, the “drive frequency” means not the switching frequency of the inverter that drives the induction machine but the frequency of the three-phase alternating current supplied to the stator.

  According to the induction machine, it is possible to easily change the number of poles according to the operation state of the induction machine. In other words, by changing the drive frequency, the number of poles can be increased during low-speed operation, or the number of poles can be reduced during high-speed operation, exhibiting high torque at low-speed operation and good performance at high-speed operation. It is possible to realize an induction machine that can achieve both of the above and a multi-function induction machine with a high degree of freedom. Further, since it is not necessary to provide the stator windings and the inverter for driving the induction machine for six phases, it is possible to prevent the cost from being significantly increased.

  In the induction machine according to the present invention, preferably, the number of slots at an electrical angle of 360 degrees of the stator is any one of 9, 12, 15, 18, 21, 24, 27, 30, 33, and 36. .

  In the induction machine according to the present invention, preferably, the stator has a permanent magnet type rotating electrical machine having a rotor with 10 poles at an electrical angle of 360 degrees with 12 slots at an electrical angle of 360 degrees. The arrangement of concentrated windings is the same as that of the stator for a permanent magnet type rotating electrical machine that can be used for both the permanent magnet type rotating electrical machine having a 14 pole permanent magnet rotor.

  According to the above induction machine, the magnetomotive force waveform of the stator as the armature includes many spatial harmonic order components including the primary component. Among these, the magnetomotive force amplitude increases in the order of the harmonic order from the fifth order, the seventh order, and the first order. Therefore, an induction machine driven with 10 poles can be realized by using the fifth component of the stator magnetomotive force wave, and an induction machine driven with 14 poles can be realized by using the seventh component of the stator magnetomotive force wave. realizable. In any case, an induction machine driven by 10 poles and an induction machine driven by 14 poles can be realized with the same stator arrangement and the same stator winding connection, and the driving frequency of the current flowing through the stator and the current flowing through the stator By changing the order of the energized phases, which is the order of the phases, the 10-pole drive and the 14-pole drive can be changed.

  In the induction machine according to the present invention, preferably, the stator has a permanent magnet type rotating electric machine having a rotor with an 8-pole permanent magnet at an electrical angle of 360 degrees with nine slots at an electrical angle of 360 degrees. It has the same arrangement of concentrated windings as the stator for a permanent magnet type rotating electrical machine that can be used for both the permanent magnet type rotating electrical machine having a 10-pole rotor with a permanent magnet.

  According to the above induction machine, the magnetomotive force waveform of the stator as the armature includes many spatial harmonic order components including the primary component. Among these, the magnetomotive force amplitude becomes large when the harmonic order is 4th or 5th. For this reason, an induction machine driven with 8 poles can be realized by using the fourth order component of the stator magnetomotive force wave, and an induction machine driven with 10 poles can be realized by using the fifth order component of the stator magnetomotive force wave. realizable. In any case, an induction machine driven by 8 poles and an induction machine driven by 10 poles can be realized with the same stator arrangement and the same stator winding connection, and the drive frequency of the current flowing through the stator and the current flowing through the stator By changing the order of the energized phases, which is the order of the phases, the 8-pole drive and the 10-pole drive can be changed.

  In the induction machine according to the present invention, preferably, the stator has a permanent magnet type rotating electrical machine having a rotor number with a permanent magnet of 10 poles with an electrical angle of 360 degrees and 18 slots at an electrical angle of 360 degrees. The same concentrated winding as the stator for a permanent magnet type rotating electrical machine that can be used for all of the permanent magnet type rotating electrical machine having a 14 pole permanent magnet rotor and the permanent magnet type rotating electrical machine having a 22 pole permanent magnet rotor It has a line arrangement.

  According to the above induction machine, the magnetomotive force waveform of the stator as the armature includes many spatial harmonic order components including the primary component. Among them, the magnetomotive force amplitude becomes large when the harmonic order is 5th, 7th, and 11th. Therefore, an induction machine driven with 10 poles can be realized by using the fifth component of the stator magnetomotive force wave, and an induction machine driven with 14 poles can be realized by using the seventh component of the stator magnetomotive force wave. An induction machine driven with 22 poles can be realized by using the 11th-order component of the stator magnetomotive force wave. In any case, an induction machine driven by 10 poles, an induction machine driven by 14 poles and an induction machine driven by 22 poles can be realized with the same stator arrangement and the same stator winding connection, By changing the drive frequency and the energization phase order that is the order of the phases of the currents flowing through the stator, it is possible to change between 10-pole drive, 14-pole drive, and 22-pole drive.

  In the induction machine according to the present invention, preferably, the rotor has a plate-like conductor or a squirrel-cage conductor having holes penetrating in the axial direction at a plurality of locations in the circumferential direction.

  In addition, the induction machine pole number switching system according to the present invention includes the induction machine according to the present invention and the drive frequency of the current flowing through each concentrated winding, the magnetomotive force harmonic order component of the rotating magnetic flux generated by the stator. And a switching control unit capable of switching to any one of a plurality of selected frequencies according to the induction machine pole number switching system.

  Further, in the induction machine pole number switching system according to the present invention, preferably, the switching control unit sets the drive frequency of the current flowing through each concentrated winding to a plurality of selected frequency ranges according to the rotational speed of the rotor of the induction machine. Switch to any one of the following.

  Moreover, the induction machine pole number switching system according to the present invention preferably includes an energized phase sequence switching unit capable of switching the phase sequence of the power source of the current flowing through each concentrated winding.

  According to the induction machine pole number switching system, it is possible to more effectively increase the number of poles that can be switched.

  According to the induction machine and induction machine pole number switching system according to the present invention, it is possible to exhibit high torque at low speed operation and to exhibit good performance at high speed operation without causing a significant increase in cost. An induction machine that can achieve both is realized.

[First Embodiment]

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 10 show a first embodiment of the present invention. FIG. 1 is a schematic configuration diagram illustrating an induction machine pole number switching system according to a first embodiment. FIG. 2 is a diagram showing in detail the configuration of the energized phase sequence switching unit shown in FIG. FIG. 3 is a half schematic cross-sectional view showing the stator and rotor constituting the induction motor, which is the induction machine according to the first embodiment. FIG. 4 is a schematic diagram showing the circumferential direction of the stator in a lateral direction for explaining the winding arrangement of the stator shown in FIG. FIG. 5 is a diagram showing the relationship between the electrical angle and the magnetomotive force in one state of the magnetomotive force waveform of the stator in the first embodiment. FIG. 6 is a diagram illustrating the magnetomotive force amplitude of the stator in the first embodiment, broken down by the harmonic order. FIG. 7 is a diagram illustrating a torque characteristic with respect to a drive frequency, which is an input frequency of a current flowing through the stator winding, in the first embodiment. FIG. 8 is a diagram showing a time change of the magnetomotive force waveform of the primary component of the stator in the first embodiment when an alternating current is passed in the order of the U phase, the V phase, and the W phase. FIG. 9 is a diagram illustrating the time change of the magnetomotive force waveform of the fifth-order component of the stator in the first embodiment when an alternating current is passed in the order of the U phase, the V phase, and the W phase. FIG. 10 is a diagram illustrating a time change of the magnetomotive force waveform of the seventh-order component of the stator in the first embodiment when an alternating current is passed in the order of the U phase, the V phase, and the W phase.

  As shown in FIG. 1, an induction machine pole number switching system 10 according to the present embodiment is supplied from an induction motor 12 that is a rotating electric machine and an induction machine, a secondary battery 14 that is a power source, and a secondary battery 14. The DC phase current is converted into an R phase, S phase, and T phase three-phase AC current, and the energized phase sequence of the three-phase AC current supplied from the inverter 16 is switched to the U phase, V phase, and W phase. 2 for switching to a three-phase AC current and outputting the same to the induction motor 12, and a switching element (not shown) included in the inverter 16 (FIG. 1) and PWM in the energized phase sequence switching unit 18 shown in detail in FIG. A controller 20 (FIG. 1), which is a switching control unit that controls driving of the induction motor 12 by outputting a control signal such as a signal, is provided. The controller 20 also controls the switch switching state of the energized phase sequence switching unit 18. In addition, in this Embodiment, as shown in FIG. 1, the structure containing the secondary battery 14 and the inverter 16 is demonstrated as the induction motor pole number switching system 10, but this invention is added to such a structure, For example, a fuel cell may be included in addition to the secondary battery 14, and for example, a system main relay, a low voltage battery, a DC / DC converter, a smoothing capacitor, and the like may be included. The configuration of the energized phase sequence switching unit 18 will be described in detail later.

  In the case of the present embodiment, the number of poles of the induction motor 12 can be switched by changing the driving frequency of the current flowing through the stator windings constituting the induction motor 12 and the current phase sequence of the current flowing through the stator windings. Yes. That is, as shown in FIG. 3, the induction motor 12 includes a stator 22 fixed inside a casing (not shown) and a rotor that is disposed so as to face the inside of the stator 22 in a radial direction and is rotatable with respect to the stator 22. 24. The rotor 24 is provided on the outer diameter side of a rotating shaft (not shown) that is rotatably supported with respect to the casing. That is, the induction motor 12 of the present embodiment is a radial type induction motor 12 in which the stator 22 and the rotor 24 are arranged so as to face each other in the radial direction. The induction motor 12 may be a motor generator that can also be used as a generator. The motor generator functions as an electric motor when electric power is supplied, and functions as a generator during braking.

  The stator 22 is a stator core 26 composed of an iron core or the like constructed by laminating a plurality of electromagnetic steel plates and the like, and a stator that is a multi-phase, U-phase, V-phase, and W-phase concentrated winding. Windings 28u, 28v, 28w are provided. The stator core 26 is provided with a plurality of teeth 30 protruding radially inward at intervals in the circumferential direction, and slots 32 are formed between the teeth 30. That is, with respect to the circumferential direction of the stator 22, so-called 12-slot stators are formed by providing slots 32 at 12 locations with an electrical angle of 360 degrees. That is, 24 slots 32 are provided on the entire circumference of the stator 22. The stator windings 28u, 28v, 28w of each phase pass through the slot 32 and are wound around the teeth 30 by concentrated winding. By passing a three-phase alternating current through the stator windings 28u, 28v, 28w of each phase, the teeth 30 are magnetized and a rotating magnetic field that rotates in the circumferential direction of the stator 22 is generated. The stator 22 has a mechanical angle of 180 degrees, that is, a semi-circular portion, which is a half portion, and an electrical angle of 360 degrees.

  On the other hand, the rotor 24 includes a squirrel-cage conductor 34 made of copper, aluminum, or the like, and a rotor core 36 made of an iron core or the like that is formed by stacking a plurality of steel plates. The squirrel-cage conductor 34 has a configuration similar to that of a squirrel-cage conductor that has been conventionally used for induction motors, and a plurality of, for example, 40, holes are provided in a plurality of holes provided in the circumferential direction of the rotor core 36. A column portion is inserted, and both ends of each column portion are connected to a plurality of circumferential positions of a pair of short-circuit rings (not shown) provided on both sides in the axial direction. The cage conductor can be integrally formed by casting aluminum.

  Further, the winding direction of the stator windings 28u, 28v, 28w is varied depending on the electrical angle. FIG. 4 shows the circumferential direction of the stator 22 expanded in the left-right direction in order to explain the arrangement of the stator windings 28u, 28v, 28w in more detail. 3 and 4, two stator windings 28u, 28v, 28w of the same phase are arranged adjacent to each other in the circumferential direction to form one stator winding set, and each set of stator windings 28u, 28v. , 28w, the winding directions are different from each other. In FIGS. 3 and 4, the symbols indicated by “・” or “x” in the circles inside the stator windings 28 u, 28 v, 28 w indicate the direction of the current flowing through the stator windings 28 u, 28 v, 28 w. In the circles, “·” indicates that current flows on the front side of the figure, and “x” indicates that current flows on the back side of the figure (FIG. 13 described later). To FIG. 15). In FIG. 4, CW has the stator windings 28u, 28v, 28w wound around the teeth 30 in the forward direction, and CCW has the windings 28u, 28v, 28w wound around the teeth 30 in the opposite direction. Represents.

  For this configuration, the stator 22 has a permanent magnet type rotating electrical machine having a rotor with 10 poles and a permanent magnet type rotor having 14 poles at an electrical angle of 360 degrees with 12 slots at an electrical angle of 360 degrees. It has the same arrangement of stator windings as a permanent magnet type rotating electrical machine stator that can be used for both a permanent magnet type rotating electrical machine having a magnet rotor. U-phase, V-phase, and W-phase alternating currents are supplied to the U-phase, V-phase, and W-phase stator windings 28u, 28v, and 28w from the inverter 16 (FIG. 1) side.

  In such an induction motor 12, the number of poles can be switched by changing the drive frequency of the current flowing through each stator winding 28u, 28v, 28w in accordance with the rotating magnetic flux generated by the stator 22. That is, among the magnetomotive force harmonic order components of the rotating magnetic flux generated by the stator 22, each stator winding 28 u according to the magnetomotive force harmonic order component in which the magnetomotive force amplitude is larger than the magnetomotive force amplitude of the primary component. , 28v, 28w, the number of poles of the induction motor 12 can be switched by changing the driving frequency of the current flowing to the driving frequency corresponding to the primary component. That is, the number of poles can be reduced by changing the drive frequency of the current flowing through each stator winding 28u, 28v, 28w according to the magnetomotive harmonic order component of the stator windings 28u, 28v, 28w of the stator 22. Switchable. The reason for this will be described in detail below. In the following description, the same elements as those shown in FIGS. 1 to 4 are denoted by the same reference numerals. In the present embodiment, the magnetomotive force distribution that generates the rotating magnetic field in the stator 22 is not a fundamental wave, that is, a sine wave distribution of only the primary component, but includes a harmonic component. In particular, when the stator windings 28u, 28v, 28w of the present embodiment are arranged, the magnetomotive force distribution with respect to the electrical angle in one state generated by the stator 22 is as shown in FIG. In FIG. u represents a dimensionless unit (the same applies to FIG. 6). As shown in FIG. 6, when the magnetomotive force is decomposed by the harmonic order, the magnetomotive force amplitude increases in the order of the fifth-order component, the seventh-order component, and the first-order component. The harmonic component generated in the magnetomotive force due to the arrangement of the stator windings 28u, 28v, 28w is called a spatial harmonic. For this reason, a rotating magnetic field is generated in the stator 22 by supplying to the stator windings 28u, 28v, 28w a current having a frequency synchronized with the primary component magnetomotive force, that is, the primary component of the magnetomotive force wave of the stator 22. In this case, the stator 22 has two poles with an electrical angle of 360 degrees. That is, the stator 22 functions as having four poles around the entire circumference.

  Further, by supplying a current having a frequency synchronized with the magnetomotive force of the fifth component, that is, the fifth component of the magnetomotive wave of the stator 22, to the stator windings 28u, 28v, 28w, a rotating magnetic field is generated in the stator 22, In this case, the stator 22 has 10 poles with an electrical angle of 360 degrees. That is, the stator 22 functions as having 20 poles on the entire circumference.

  Further, by supplying a current of a frequency synchronized with the magnetomotive force of the seventh component, that is, the seventh component of the magnetomotive wave of the stator 22 to the stator windings 28u, 28v, 28w, a rotating magnetic field is generated in the stator 22, In this case, the stator 22 has 14 poles with an electrical angle of 360 degrees. That is, the stator 22 functions as having 28 poles all around.

  In any case, when the number of poles of the stator 22 is one of two poles, ten poles, and fourteen poles at an electrical angle of 360 degrees, the pole number of the rotor 24 also changes to the same pole number as that of the stator 22. Then, an induction current is generated in the cage conductor 34 and the induction motor 12 is driven. In this case, as shown in FIG. 7, for example, when the induction motor 12 is rotated at the same rotational speed of about 25 rotations / second, the stator windings 28u, 28v, 28w have a frequency slightly higher than 50 Hz (for example, 60 Hz). ), The induction motor 12 is driven as having a pole number of 2 poles with an electrical angle of 360 degrees and a total of 4 poles. Further, by passing a current having a frequency slightly higher than 250 Hz through the stator windings 28u, 28v, 28w, the induction motor 12 is driven as having 10 poles at an electrical angle of 360 degrees and a total of 20 poles. . In addition, the induction motor 12 is driven with a pole number of 14 poles at an electrical angle of 360 degrees and a total of 28 poles by supplying a power source current having a frequency slightly higher than 350 Hz to the stator windings 28u, 28v, 28w. To do.

  In addition, when a low frequency current is input to the stator 22 so as to drive with two poles at an electrical angle of 360 degrees, the applied voltage can be low, and it is easy to ensure good performance at high speed rotation. On the other hand, when a high-frequency current is input to the stator 22 so as to drive at 10 or 14 poles at an electrical angle of 360 degrees, as is apparent from FIG. The induction motor 12 can be driven by torque. In the present embodiment, V / F constant control is performed so that V / F, which is the ratio of voltage V input to stator 22 and drive frequency F, is constant during high-speed rotation. On the other hand, in low speed rotation, the drive of the induction motor 12 is controlled only by changing the frequency. The number of poles shown in FIG. 7 represents the number of poles of the entire stator 22.

  On the other hand, when an electric current is input to the stator 22 so as to be driven by 10 poles at an electrical angle of 360 degrees, in both cases of inputting current to the stator 22 so as to be driven by 2 poles and 4 poles In contrast, when an alternating current is passed in the order of the U-phase, V-phase, and W-phase stator windings 28u, 28v, and 28w, the induction motor 12 rotates in the reverse direction. In the present embodiment, in consideration of such circumstances, a case where a current is input to the stator 22 so as to drive with two poles, a case where a current is input to the stator 22 so as to drive with four poles, and 10 In order to cause the induction motor 12 to rotate in the positive direction in all cases where current is input to the stator 22 so as to be driven by poles, an energized phase sequence switching unit 18 is provided in the induction motor pole number switching system 10. . Next, this will be described in detail.

  8 shows the time course of the magnetomotive force component of the primary component of the stator 22, FIG. 9 shows the time course of the magnetomotive force component of the fifth order component of the stator 22, and FIG. 10 shows the time course of the seventh order component of the stator 22. The time course of the magnetic component is shown respectively. 8 to 10 show the case where the current flowing through the stator 22 is input in the order of the U phase, the V phase, and the W phase. The alternate long and short dash line represents the time course of the magnetomotive force wave of the stator 22 that actually occurs after the synthesis of all components. As shown in FIGS. 8 to 10, the magnetomotive force components of the primary component and the seventh component of the stator 22 rotate in the positive direction when a current is passed through the stator 22 in the order of the U phase, the V phase, and the W phase. That is, it moves to the right direction of FIG. 8, FIG. On the other hand, the magnetomotive force component of the fifth-order component of the stator 22 rotates in the opposite direction when current flows through the stator 22 in the order of the U phase, V phase, and W phase, that is, in the left direction in FIG. Transition. Therefore, when the induction motor 12 is rotated in the positive direction by using the magnetomotive force component of the fifth order, that is, in the case of rotating in the positive direction as having 10 poles with an electrical angle of 360 degrees, the U phase, W It is necessary to pass current through the stator 22 in the order of phase and V phase. On the other hand, using the magnetomotive force component of the primary component, the induction motor 12 is rotated in the positive direction, that is, rotating in the positive direction as having two poles with an electrical angle of 360 degrees, and the occurrence of the seventh component. In both the case where the induction motor 12 is rotated in the positive direction using the magnetic force component, that is, in the case where the induction motor 12 is rotated in the positive direction as having 14 poles with an electrical angle of 360 degrees, the U phase, V phase, and W phase What is necessary is just to flow an electric current through the stator 22 in order.

  Therefore, as shown in FIGS. 1 and 2, in the induction motor pole number switching system 10 of the present embodiment, the energized phase sequence switching unit 18 is provided, and the stator 22 (FIG. 3) of the induction motor 12 is provided. Depending on the frequency of the current to flow or the switching of the number of poles to be realized, the current is switched in the order of the U phase, the V phase, and the W phase, or the current is switched in the order of the U phase, the W phase, and the V phase. The induction motor pole number switching system 10 includes an inverter 16, a controller 20, and an angle sensor 40 such as a resolver that can detect the rotation angle of the induction motor 12. The controller 20 has a rotation speed calculation unit that calculates the rotation speed of the rotor 24 of the induction motor 12. When the detection signal from the angle sensor 40 is input to the controller 20, the rotation speed calculation unit The rotation speed of the rotor 24 of the induction motor 12 is calculated from the rotation angle of the rotor 24.

  Further, the controller 20 includes a current frequency switching control unit 42 and an energized phase sequence switching control unit 44, and the current frequency switching control unit 42 is a predetermined speed at which the rotation speed of the rotor 24 of the induction motor 12 is set in advance. In the case of a low rotational speed less than v1, the inverter 16 is controlled such that the frequency of the current flowing through the stator 22 is a high frequency at which the induction motor 12 is driven at 10 or 14 poles with an electrical angle of 360 degrees. . That is, among the magnetomotive force harmonic order components of the rotating magnetic flux generated by the stator 22, the fifth order component or 7 which is the magnetomotive force harmonic order component in which the magnetomotive force amplitude is larger than the magnetomotive force amplitude of the primary component. The drive frequency of the current flowing through each stator winding 28u, 28v, 28w is changed by controlling the inverter 16 so as to have a frequency according to the next component. Further, the current frequency switching control unit 42 is configured such that when the rotation speed of the induction motor 12 is a high rotation speed equal to or higher than the predetermined speed v1, the frequency of the current flowing through the stator 22 is an electrical angle of 360 degrees for the induction motor 12. The inverter 16 is controlled so as to have a low frequency lower than the high frequency driven by the pole. That is, the drive frequency of the current flowing through each stator winding 28 u, 28 v, 28 w is changed by controlling the inverter 16 so that the frequency corresponds to the primary component of the rotating magnetic flux generated by the stator 22. Even at the same drive frequency, the relationship between the rotational speed of the induction motor 12 and the number of poles is determined by the magnitude of the current flowing through the stator 22.

  In this way, the current frequency switching control unit 42 selects the drive frequency of the current flowing through each stator winding 28u, 28v, 28w from any of a plurality of selectable selection frequency ranges according to the rotational speed of the rotor 24 of the induction motor 12. Or has a function of switching to 1. That is, the current frequency switching control unit 42 sets the drive frequency of the current flowing through each stator winding 28u, 28v, 28w when the rotational speed of the rotor 24 of the induction motor 12 is higher than a predetermined speed set in advance. When the rotational speed of the rotor 24 of the induction motor 12 is lower than a predetermined speed set in advance, the selected frequency range is set to a higher frequency than the low frequency. It has a function to switch. That is, the current frequency switching control unit 42 sets the driving frequency of the current flowing through each of the stator windings 28u, 28v, and 28w to a magnetomotive force amplitude of the magnetomotive force harmonic order component of the rotating magnetic flux generated by the stator 22. It has a function that can be switched to any one of a plurality of selection frequencies corresponding to a magnetomotive harmonic order component that is larger than the magnetomotive force amplitude of the next component and the primary component. FIG. 7 shows a case where the induction motor 12 having 4 poles, 20 poles, and 28 poles as a whole is rotated at the same speed, and the torque characteristic with respect to the drive frequency changes according to the rotation speed of the induction motor 12. To do.

  Returning to FIG. 2, the energized phase sequence switching unit 18 can switch the energized phase sequence of the current flowing through the stator windings 28 u, 28 v, 28 w (FIGS. 3 and 4), and from the inverter 16 (FIG. 1). The R-phase, S-phase, and T-phase AC currents that are output are input, and the switch S1 is turned on and the switch S2 is turned off, so that the R-phase, S-phase, and T-phase AC currents are respectively A three-phase alternating current of U phase, V phase, and W phase is set. For this reason, when an alternating current flows in the order of R phase, S phase, and T phase, a current flows in the stator 22 in the order of U phase, V phase, and W phase. In contrast, when the switch S1 is turned off and the switch S2 is turned on, the R-phase, S-phase, and T-phase AC currents are converted into U-phase, W-phase, and V-phase three-phase AC currents, respectively. Become. For this reason, when an alternating current flows in the order of R phase, S phase, and T phase, a current flows in the stator 22 in the order of U phase, W phase, and V phase.

  The energized phase sequence switching control unit 44 shown in FIG. 1 is used when the rotational speed of the induction motor 12 is a speed corresponding to a case where the induction motor 12 is driven with two poles at an electrical angle of 360 degrees or a case where the induction motor 12 is driven with 14 poles. 2 to turn on the switch S1 and turn off the switch S2, that is, so that the current flows through the stator 22 (FIG. 3) in the order of the U phase, the V phase, and the W phase. 18 is controlled.

  Further, the energized phase sequence switching control unit 44 shown in FIG. 1 switches the switch S1 shown in FIG. 2 when the rotational speed of the induction motor 12 is a speed corresponding to driving with 10 poles at an electrical angle of 360 degrees. Is switched off and the switch S2 is turned on, that is, the energized phase sequence switching unit 18 is controlled so that current flows through the stator 22 (FIG. 3) in the order of U phase, W phase, and V phase. With such a configuration, when the current is input to the stator 22 so that the induction motor 12 is driven with two poles, when the current is input to the stator 22 so that the induction motor 12 is driven with 10 poles, the induction motor The induction motor 12 rotates in the positive direction in all cases where current is input to the stator 22 so that 12 is driven with 14 poles. Further, the number of poles is switched according to the rotational speed of the rotor 24 of the induction motor 12. That is, among the magnetomotive force harmonic order components of the rotating magnetic flux generated by the stator 22, each stator winding 28 u according to the magnetomotive force harmonic order component in which the magnetomotive force amplitude is larger than the magnetomotive force amplitude of the primary component. , 28v, 28w, the number of poles of the induction motor 12 can be switched by changing the driving frequency of the current flowing to the driving frequency corresponding to the primary component.

  According to the induction motor 12 of this embodiment, the magnetomotive force amplitude of the rotating magnetic flux generated by the stator 22 is greater than the magnetomotive force amplitude of the primary component among the magnetomotive harmonic order components. The number of poles can be switched by changing the drive frequency of the current flowing through each stator winding 28u, 28v, 28w according to the magnetic harmonic order component with respect to the drive frequency corresponding to the primary component. For this reason, the magnetomotive force waveform of the stator 22, which is an armature, includes many spatial harmonic order components including a primary component. For this reason, by using magnetomotive force components of orders other than the primary component of the magnetomotive wave of the stator 22, induction motors that are driven with different poles by the same arrangement of the stator 22 and the connection of the same stator windings 28u, 28v, 28w. 12 can be realized, and the number of poles of the induction motor 12 can be changed by changing the driving frequency of the current flowing through the stator 22 and the energization phase sequence of the current flowing through the stator 22. On the other hand, by using a rotor 24 for an induction motor having a squirrel-cage conductor as the rotor 24 opposed to the stator 22, the number of poles of the rotor 24 depends on the number of poles determined due to the magnetomotive force wave of the stator 22. An induced current is generated in the rotor 24 by the magnetomotive force of the stator 22. That is, unlike the rotor with magnet, the magnetic pole of the rotor 24 is not mechanically fixed to 1, but has magnetic flexibility that is changed by the magnetomotive force of the stator 22. For this reason, the variable pole number induction motor in which the number of poles can be changed by changing the drive frequency of the current flowing through the stator 22 and the order of the energized phases can be realized.

  Thus, according to the induction motor 12 of the present embodiment, it is possible to easily change the number of poles according to the operating state of the induction motor 12. In other words, by changing the drive frequency, the number of poles can be increased during low-speed operation, or the number of poles can be reduced during high-speed operation, exhibiting high torque at low-speed operation and good performance at high-speed operation. Thus, the induction motor 12 that can be compatible with the above can be realized, and the multifunction induction motor 12 having a high degree of freedom can be realized. Further, since it is not necessary to provide any of the stator windings 28u, 28v, 28w constituting the induction motor 12 and the inverter 16 for driving the induction motor 12, it is possible to prevent the cost from being significantly increased. As a result, it is possible to realize the induction motor 12 capable of achieving both high torque at low speed operation and good performance at high speed operation without causing a significant increase in cost.

In addition, the stator 22 has 12 slots 32 at an electrical angle of 360 degrees, a permanent magnet type rotating electrical machine having a 10 pole permanent magnet rotor, and a permanent magnet type rotating electrical machine having a 14 pole permanent magnet rotor. The arrangement of concentrated windings is the same as that of a permanent magnet type rotating electrical machine stator that can be used for both. For this reason, the magnetomotive force waveform of the stator 22, which is an armature, includes many spatial harmonic order components including a primary component. Among these, the magnetomotive force amplitude increases in the order of the harmonic order from the fifth order, the seventh order, and the first order. For this reason, the induction motor 12 driven by 10 poles can be realized by using the fifth order component of the magnetomotive force wave of the stator 22, and the 14th pole can be obtained by using the seventh order component of the magnetomotive force wave of the stator 22. The driven induction motor 12 can be realized. In any case, the induction motor 12 driven by 2 poles, the induction motor 12 driven by 10 poles, and the induction motor 12 driven by 14 poles are connected with the same stator 22 arrangement and the same stator windings 28u, 28v, 28w. The two-pole drive, the ten-pole drive, and the four-pole drive can be changed by changing the drive frequency of the current that flows to the stator 22 and the energization phase order that is the order of the phases of the current that flows to the stator 22. it can. In the present embodiment, among the magnetomotive force harmonic order components of the rotating magnetic flux generated by the stator 22, the magnetomotive force harmonic order component whose magnetomotive force amplitude is larger than the magnetomotive force amplitude of the primary component is 5 The case where there are two orders, the next and the seventh, has been described. However, in the present invention, the number of poles can be changed by changing the drive frequency even when there is only one or three or more magnetomotive harmonic order components whose magnetomotive force amplitude is larger than the magnetomotive force amplitude of the primary component. Can be converted.
[Second Embodiment]

  Next, a second embodiment of the present invention will be described. Prior to the description of the present embodiment, the types of poles that can be converted with respect to the number of slots of the stator in the induction machine according to the present invention will be described with reference to FIGS. FIG. 11 is a diagram illustrating the number of poles that can be converted by the induction machine when the number of slots of the stator is any one of 9, 12, and 18. In FIG. 11, black portions indicate that the motor can be driven, that is, an electric motor capable of generating torque can be realized. Further, the portion indicated by the oblique lattice indicates that it can be used by arranging two stator windings when the number of slots of the stator is nine. For example, as in the case of the first embodiment shown in FIGS. 1 to 10 described above, when the number of slots of the stator 22 is 12, two poles and ten poles at an electrical angle of 360 degrees. An induction machine that can be driven with 14 poles can be realized. In this case, the induction machine has both an electrical angle of 360 degrees and a permanent magnet type rotating electrical machine having a 10 pole permanent magnet rotor and a permanent magnet type rotating electrical machine having a 14 pole permanent magnet rotor. The stator windings 28u, 28v and 28w are arranged in the same concentrated winding as the usable permanent magnet type rotating electrical machine stator.

  When the number of slots of the stator is 9, an induction machine that can be driven with 2 poles, 4 poles, 8 poles, and 10 poles at an electrical angle of 360 degrees can be realized. In this case, the induction machine has an electrical angle of 360 degrees, a permanent magnet type rotating electrical machine having a rotor with a 4-pole permanent magnet, a permanent magnet type rotating electrical machine having a rotor with an 8-pole permanent magnet, and 10 poles. The stator winding arrangement is the same concentrated winding as the permanent magnet type rotating electrical machine stator that can be used for all the permanent magnet type rotating electrical machines having the permanent magnet rotor.

  When the number of slots of the stator is 18, an induction machine that can be driven with 2 poles, 10 poles, 14 poles, and 22 poles at an electrical angle of 360 degrees can be realized. In this case, the induction machine has an electrical angle of 360 degrees, a permanent magnet type rotating electrical machine having a rotor with a 10 pole permanent magnet, a permanent magnet type rotating electrical machine having a rotor with a 14 pole permanent magnet, and 22 poles. The stator winding arrangement is the same concentrated winding as the permanent magnet type rotating electrical machine stator that can be used for all the permanent magnet type rotating electrical machines having the permanent magnet rotor.

  FIG. 12 is a diagram similar to FIG. 11, and shows the frequency ratio of the energization current to the stator and the energization phase order when the rotation frequency of the rotor is 1 when the induction machine can be driven. FIG. In FIG. 12, the portions described as x1, x2,... Represent the magnification of the frequency of the energization current to the stator when the rotation frequency of the rotor is 1 when the induction machine can be driven. ing. In FIG. 12, “UVW” represents a positive energized phase sequence in which current flows through the stator in the order of U, V, and W with respect to the rotation direction of the rotor, and “UWV” represents the rotor direction. It represents that the energized phase is in the reverse direction in which current flows through the stator in the order of U, W, and V with respect to the rotation direction. The hatched portion indicates that the stator winding arrangement can be used by arranging two stator winding arrangements when the number of stator slots is nine.

  In the present embodiment, first, an induction machine capable of switching the number of poles, in which the number of stator slots is 9, will be described. In the third and fourth embodiments described later, the number of stator slots is described. Two examples of induction machines capable of switching the number of poles, which is 18 will be described.

  FIG. 13 is a view similar to FIG. 4 for explaining the winding arrangement of the stator constituting the induction motor, which is the induction machine of the present embodiment. As shown in FIG. 13, in the present embodiment, the stator 22a has nine slots 32 with an electrical angle of 360 degrees, and stator windings 28u, 28v that are concentrated windings on the teeth 30 and are concentrated windings. , 28w, and U-phase, V-phase, and W-phase stator windings 28u, 28v, 28w are adjacent to each other in the circumferential direction by three stator windings 28u, 28v, 28w. One set is arranged in a row, and each set is arranged adjacent to each other in the circumferential direction. Further, the winding directions of the stator windings 28u, 28v, 28w are different between adjacent ones in each group. In FIG. 13, CW indicates that the stator windings 28u, 28v, and 28w are wound around the teeth 30 in the forward direction, and CCW indicates that the stator windings 28u, 28v, and 28w are wound around the teeth 30 in the opposite direction. (The same applies to FIGS. 14 and 15 described later). Further, adjacent stator windings 28u, 28v, 28w are wound around the teeth 30 in the same positive direction in adjacent groups.

  For this configuration, the stator 22a has 9 slots 32 at an electrical angle of 360 degrees, a permanent magnet type rotating electrical machine having a rotor with a 4-pole permanent magnet, and a permanent having a rotor with an 8-pole permanent magnet. A stator winding arrangement, which is the same concentrated winding as a permanent magnet type rotating electrical machine stator that can be used for all of a magnet type rotating electrical machine and a permanent magnet type rotating electrical machine having a rotor with a 10-pole permanent magnet. Have.

  Further, as shown in FIG. 12, the stator 22a is supplied with currents in the order of the U phase, the V phase, and the W phase in both the case of driving the induction motor of this embodiment with two poles and the case of driving with eight poles. In both the case of driving with 4 poles and the case of driving with 10 poles, current is passed through the stator 22a in the order of U phase, W phase, and V phase. In addition, the frequency of the energization current to the stator 22a is doubled when the case of driving with 2 poles is 1, when driving with 4 poles, driving with 8 poles, and driving with 10 poles. The frequency is 4 times or 5 times. Switching of the energized current frequency by the inverter 16 (see FIG. 1) and switching of the energized phase sequence by the energized phase sequence switching unit 18 (see FIG. 1) are controlled by the controller 20 (see FIG. 1).

According to the induction motor of this embodiment, the magnetomotive force waveform of the stator 22a that is an armature includes many spatial harmonic order components including a primary component. Among these, the magnetomotive force amplitude becomes large when the harmonic order is 4th or 5th. For this reason, an induction motor driven with 8 poles can be realized by using the quaternary component of the magnetomotive wave of the stator 22a, and driven with 10 poles by using the quintic component of the magnetomotive wave of the stator 22a. An induction motor can be realized. In any case, an induction motor driven by 2 poles, an induction motor driven by 8 poles, and an induction motor driven by 10 poles are arranged with the same stator 22a and the same stator windings 28u, 28v, 28w. This can be realized, and the two-pole drive, the eight-pole drive, and the ten-pole drive can be changed by changing the driving frequency of the current flowing through the stator 22a and the energization phase sequence of the current flowing through the stator 22. Since other configurations and operations are the same as those in the first embodiment, the same parts are denoted by the same reference numerals, and overlapping illustrations and descriptions are omitted.
[Third Embodiment]

  FIG. 14 is a view similar to FIG. 4 for explaining the winding arrangement of the stator constituting the induction motor, which is the induction machine of the third embodiment of the present invention. As shown in FIG. 14, in the present embodiment, the stator 22b has 18 slots 32 with an electrical angle of 360 degrees, and the stator windings 28u and 28v that are concentrated windings on the teeth 30 as concentrated windings. , 28w, and U-phase, W-phase, and V-phase stator windings 28u, 28w, and 28v are adjacent to each other in the circumferential direction by three stator windings 28u, 28w, and 28v. One set is arranged in a row, and each set is arranged adjacent to each other in the circumferential direction. Further, the winding directions of the stator windings 28u, 28w, 28v adjacent to each other are different from each other. The adjacent stator windings 28u, 28w, 28v of the adjacent sets are also different in winding direction.

  Because of this configuration, the stator 22b has 18 slots 32 at an electrical angle of 360 degrees, a permanent magnet type rotating electrical machine having a 10-pole permanent magnet rotor, and a permanent magnet having a 14-pole permanent magnet rotor. A stator winding arrangement that is the same concentrated winding as a permanent magnet type rotating electrical machine stator that can be used for both a magnet type rotating electrical machine and a permanent magnet type rotating electrical machine having a rotor with a permanent magnet of 22 poles. Have.

  Also, as shown in FIG. 12 above, the stator 22b has a U-phase, V-phase, and W-phase in both the case of driving the induction motor of the present embodiment with two poles and the case of driving with 14 poles. The current is passed in order, and the current is passed through the stator 22b in the order of the U phase, the W phase, and the V phase in both the case of driving with 10 poles and the case of driving with 22 poles. In addition, the frequency of the energizing current to the stator 22b is 5 times when driving with 2 poles, when driving with 10 poles, driving with 14 poles, and driving with 22 poles. , 7 times and 11 times the frequency. Switching of the energized current frequency by the inverter 16 (see FIG. 1) and switching of the energized phase sequence by the energized phase sequence switching unit 18 (see FIG. 1) are controlled by the controller 20 (see FIG. 1).

According to the induction motor of this embodiment, the magnetomotive force waveform of the stator 22b that is an armature includes many spatial harmonic order components including the primary component. Among them, the magnetomotive force amplitude becomes large when the harmonic order is 5th, 7th, and 11th. For this reason, an induction motor driven with 10 poles can be realized by using the fifth component of the magnetomotive wave of the stator 22b, and driven with 14 poles by using the seventh component of the magnetomotive wave of the stator 22b. An induction motor driven by 22 poles can be realized by using the 11th-order component of the magnetomotive force wave of the stator 22b. In any case, an induction motor driven by 2 poles, an induction motor driven by 10 poles, an induction motor driven by 14 poles, and an induction motor driven by 22 poles have the same arrangement of the stator 22b and the same stator winding 28u. , 28v, and 28w, and by changing the driving frequency of the current flowing through the stator 22b and the energization phase sequence of the current flowing through the stator 22b, two-pole driving, ten-pole driving, four-pole driving, and twenty-two-pole driving And can be changed. Since other configurations and operations are the same as those of the first embodiment shown in FIGS. 1 to 10 described above, the same parts are denoted by the same reference numerals, and overlapping illustrations and descriptions are omitted.
[Fourth Embodiment]

  FIG. 15 is a view similar to FIG. 4 for explaining the winding arrangement of the stator constituting the induction motor, which is the induction machine of the fourth embodiment of the present invention. As shown in FIG. 15, in the present embodiment, the stator 22c has 18 slots 32 with an electrical angle of 360 degrees, and the stator windings 28u and 28v that are concentrated windings on the teeth 30 as concentrated windings. 28w, and U-phase, W-phase, and V-phase stator windings 28u, 28v, and 28w are adjacent to each other in the circumferential direction by two stator windings 28u, 28v, and 28w of the respective phases. Are arranged in a circumferential direction, and each group is arranged adjacent to each other in the circumferential direction. Between adjacent groups, stator windings 28u, 28v, 28w of phases different from both of the adjacent groups are set to 1. They are arranged one by one. Further, the winding directions of the stator windings 28u, 28v, 28w of each set are different from each other. Further, the three stator windings 28u, 28v, 28w, which are arranged adjacent to each other and have different phases, have the same winding direction.

  Because of this configuration, the stator 22c has 18 slots 32 at an electrical angle of 360 degrees, a permanent magnet type rotating electrical machine having a 10 pole permanent magnet rotor, and a permanent magnet having a 14 pole permanent magnet rotor. A stator winding arrangement that is the same concentrated winding as a permanent magnet type rotating electrical machine stator that can be used for both a magnet type rotating electrical machine and a permanent magnet type rotating electrical machine having a rotor with a permanent magnet of 22 poles. Have.

  Other configurations and operations are the same as those of the third embodiment shown in FIG. In the present embodiment, the amplitude of the magnetomotive force wave generated in the stator 22c is high and the high amplitude harmonic order is the same as in the case of the third embodiment described above, but the respective high frequency harmonic orders are the same. The amplitude and phase of the magnetomotive force component of the amplitude harmonic order are different.

  FIG. 16 is a diagram showing the number of poles that can be converted by the induction machine, corresponding to the number of slots of the stator, including the cases of the above embodiments. In FIG. 16, black portions indicate that the motor can be driven, that is, an electric motor capable of generating torque can be realized. The shaded portion indicates that the motor can be driven but the torque generation efficiency is not high. For example, when the number of slots of the stator is 15, an induction machine that can be driven by 14 poles and 16 poles at an electrical angle of 360 degrees can be realized. In this case, the induction machine has an electrical angle of 360 degrees, and both a permanent magnet type rotating electric machine having a rotor with 14 poles and a permanent magnet type rotating electric machine having a rotor with a 16 pole permanent magnet. The stator winding arrangement is the same concentrated winding as the usable permanent magnet type rotating electrical machine stator. Similarly, when the number of slots at an electrical angle of 360 degrees is any one of 21, 24, 27, 30, 33, and 36, the stator constituting the induction machine is a rotor with a permanent magnet having a different number of poles. The stator winding arrangement is the same concentrated winding as the permanent magnet type rotating electrical machine stator that can be used for different permanent magnet type rotating electrical machines having the stator, and the rotor for the induction machine is opposed to the stator. In other words, an electric motor using a permanent magnet, which is a configuration deviating from the present invention, is configured by combining a rotor with a permanent magnet having the number of poles shown in FIG. 16 and a stator having the number of slots shown in FIG. The induction machine according to the present invention is configured by combining such a stator with a rotor for induction machines.

  In each of the above embodiments, the rotor 24 constituting the induction motor 12 is not limited to the one having the squirrel-cage conductor 34. For example, as the rotor 24, a plate-like conductor having holes penetrating in the axial direction at a plurality of locations in the circumferential direction, a laminate of a plurality of plate-like conductors, or a magnetic material in the holes of these plate-like conductors It is also possible to use a configuration in which a manufactured core part is arranged. In addition, the induction machine which concerns on this invention is not limited to what is used as the induction motor 12 like said each embodiment, The thing used as a generator can also be implemented.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram which shows the induction machine pole number switching system of the 1st Embodiment of this invention. It is a figure which shows in detail the structure of the energization phase order switching part shown in FIG. FIG. 3 is a half schematic cross-sectional view showing a stator and a rotor that constitute the induction machine according to the first embodiment. FIG. 2 is a schematic diagram showing the circumferential direction of the stator in a lateral direction for explaining the winding arrangement of the stator shown in FIG. 1. In 1st Embodiment, it is a figure which shows the relationship between the electrical angle and magnetomotive force in 1 state of the magnetomotive force waveform of a stator. In 1st Embodiment, it is a figure which decomposes | disassembles and shows the magnetomotive force amplitude of a stator by a harmonic order. In 1st Embodiment, it is a figure which shows the torque characteristic with respect to the drive frequency which is the input frequency of the electric current sent through a stator winding. In 1st Embodiment, it is a figure which shows the time change of the magnetomotive force waveform of the primary component of a stator in the case where an alternating current is sent in order of U phase, V phase, and W phase. In 1st Embodiment, it is a figure which shows the time change of the magnetomotive force waveform of the quintic component of a stator in the case where an alternating current is sent in order of U phase, V phase, and W phase. In 1st Embodiment, it is a figure which shows the time change of the magnetomotive force waveform of the 7th-order component of a stator in the case of flowing an alternating current in order of U phase, V phase, and W phase. It is a figure which shows the pole number which can convert the induction machine in case the slot number of a stator is any one of 9,12,18. It is a figure similar to FIG. 11, and is a figure which shows the magnification of the frequency of the energization current to the stator when the rotation frequency of the rotor is 1, and the energization phase order when the induction machine can be driven. It is a figure similar to FIG. 4 for demonstrating the winding arrangement | positioning of the stator which comprises the induction machine of the 2nd Embodiment of this invention. It is a figure similar to FIG. 4 for demonstrating the winding arrangement | positioning of the stator which comprises the induction machine of the 3rd Embodiment of this invention. It is a figure similar to FIG. 4 for demonstrating the winding arrangement | positioning of the stator which comprises the induction machine of the 4th Embodiment of this invention. It is a figure which shows the number of poles which can convert an induction machine corresponding to the number of slots of a stator.

Explanation of symbols

  10 induction machine pole number switching system, 12 induction motor, 14 secondary battery, 16 inverter, 18 energized phase sequence switching unit, 20 controller, 22, 22a, 22b, 22c stator, 24 rotor, 26 stator core, 28 stator winding, 30 teeth, 32 slots, 34 cage conductor, 36 rotor core, 38 pillar, 40 angle sensor, 42 current frequency switching control unit, 44 energized phase sequence switching control unit.

Claims (9)

A stator having three-phase concentrated windings;
A induction machine including a rotor facing the stator,
An induction machine characterized in that the number of poles can be switched by changing the driving frequency of the current flowing through each concentrated winding in accordance with the magnetomotive harmonic order component of the concentrated winding of the stator. The induction machine according to claim 1,
An induction machine characterized in that the number of slots at an electrical angle of 360 degrees of the stator is any one of 9, 12, 15, 18, 21, 24, 27, 30, 33, and 36. The induction machine according to claim 1,
The stator has 12 slots at an electrical angle of 360 degrees, a permanent magnet type rotating electrical machine having a rotor with 10 poles and a permanent magnet type having a rotor with 14 poles and an electrical angle of 360 degrees. An induction machine having the same arrangement of concentrated windings as a stator for a permanent magnet type rotating electrical machine that can be used with both rotating electrical machines. The induction machine according to claim 1,
The stator has nine slots at an electrical angle of 360 degrees, a permanent magnet type rotating electrical machine having a rotor with an 8-pole permanent magnet, and a permanent magnet type having a rotor with a 10-pole permanent magnet at an electrical angle of 360 degrees. An induction machine having the same arrangement of concentrated windings as a stator for a permanent magnet type rotating electrical machine that can be used with both rotating electrical machines. The induction machine according to claim 1,
The stator has 18 slots at an electrical angle of 360 degrees, a permanent magnet type rotating electrical machine having a rotor with 10 poles and a permanent magnet type having a rotor with 14 poles and an electrical angle of 360 degrees. An induction machine having the same arrangement of concentrated windings as a stator for a permanent magnet type rotating electrical machine that can be used for all of the rotating electrical machine and a permanent magnet type rotating electrical machine having a rotor with a permanent magnet with 22 poles. . In the induction machine according to any one of claims 1 to 5,
The rotor includes a plate-like conductor having a hole portion penetrating in an axial direction at a plurality of locations in the circumferential direction, or a squirrel-cage conductor. The induction machine according to any one of claims 1 to 6,
A switching control unit capable of switching a drive frequency of a current flowing through each concentrated winding to any one of a plurality of selection frequencies according to a magnetomotive harmonic order component of the rotating magnetic flux generated by the stator. A feature induction system pole number switching system. In the induction machine pole number switching system according to claim 7,
The switching control unit switches the driving frequency of the current flowing through each concentrated winding to any one of a plurality of selected frequency ranges according to the rotational speed of the rotor of the induction machine. . In the induction machine pole number switching system according to claim 7 or claim 8,
An induction machine pole number switching system comprising an energized phase sequence switching unit capable of switching a phase sequence of a power source of current flowing through each concentrated winding.

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