JP2014168320A - Pole change permanent magnet dynamo-electric machine and drive system thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pole change permanent magnet dynamo-electric machine drive system which can be operated to high-speed rotation range without performing flux-weakening control, while saving power, and in which connection switching of an armature winding is not required for pole change of a rotor.SOLUTION: A permanent magnet dynamo-electric machine drive system includes a permanent magnet dynamo-electric machine 1 constituted of a stator 10 having an armature winding 12 generating a rotating magnetic field of a plurality of types of pole number, and a rotor 20 having permanent magnets 22L being magnetized by a magnetic field generated by the armature current of the stator, and a drive unit 2 for converting the pole number of the rotor by magnetizing the permanent magnets 22L, and rotating the rotor 20 by the pole number thus converted.

Description

  The present invention relates to a pole conversion permanent magnet type rotating electrical machine without switching windings and a drive system thereof.

  Due to environmental and energy issues, plug-in hybrid vehicles and electric vehicles are rapidly being put into practical use, and there is a need for low power consumption, high output, and high efficiency motors in all operating areas. Rare earth element permanent magnets generate a magnetic force several tens of times that of conventional magnets, so that a high output and high efficiency motor can be obtained. In such a motor, in order to drive the motor in the middle to high speed rotation range under the limitation of the power supply voltage, inverter control is used to form a magnetic force in the opposite direction to the magnetic force (magnetic flux) of the permanent magnet, which is called weak magnetic flux control. The magnetic force (voltage) is controlled. The embedded permanent magnet motor (IPM motor) is a permanent magnet motor having a magnetic structure in which this control is effective.

  However, when the flux-weakening control is used, the copper loss and the harmonic iron loss due to the control current that does not become an output are generated, and the efficiency is greatly reduced. Therefore, when this permanent magnet type motor is mounted on a hybrid vehicle, there is a problem that fuel efficiency is reduced in the high-speed rotation range of the motor. When this permanent magnet motor is mounted on a train, the train shifts to a coasting operation mode in which no driving force is obtained from the motor when traveling at high speed between stations. However, even in the coasting operation mode, the rotor of the motor is rotated by the high-speed rotation of the wheels, whereby a high induced voltage is applied to the inverter by the permanent magnet embedded in the rotor. Therefore, although flux weakening control is performed to protect the inverter, it is necessary to consume power for the flux weakening control in the coasting operation mode that does not require a driving force, and there is a problem that energy is not saved.

Naoyoshi Hashimoto, Satoshi Kuramochi, Kazuhito Tsuji: “Permanent magnet motor that can change the number of poles and change the device constant”, 2012 IEEJ, No. 5, 18 pages, 2012.

  The present invention makes the induced voltage variable by converting the number of poles of the rotor according to the rotational speed, and lowers the induced voltage by switching to a low number of poles in the high-speed rotation range, and does not weaken the high-speed rotation range and control the magnetic flux. It is an object of the present invention to provide a pole conversion permanent magnet type rotating electric machine and its drive system that can be operated in an energy saving manner and that do not require connection switching of armature windings for rotor pole number conversion. .

  One feature of the present invention is a permanent magnet type rotating electrical machine including a stator having an armature winding for generating a rotating magnetic field having a plurality of types of poles, and a rotor having a permanent magnet magnetized by an external magnetic field. is there.

  Another feature of the present invention is a stator having an armature winding that generates a rotating magnetic field having a plurality of types of poles, and a rotor having a permanent magnet that is magnetized by a magnetic field generated by the armature current of the stator. Is a permanent magnet type rotating electrical machine.

  Another feature of the present invention is a permanent magnet type rotation comprising a stator having an armature winding that generates a rotating magnetic field having a plurality of types of poles, and a rotor having a permanent magnet magnetized by an external magnetic field. A permanent magnet type rotating electrical machine drive system including an electric machine and a drive device that converts the number of poles of the rotor by magnetizing the permanent magnet and rotates the rotor by the number of poles after the conversion.

  Still another feature of the present invention is that a stator having an armature winding that generates a rotating magnetic field having a plurality of types of poles, and a rotor having a permanent magnet that is magnetized by a magnetic field generated by an armature current of the stator. And a drive device for converting the number of poles of the rotor by magnetizing the permanent magnet and rotating the rotor by the number of poles after the conversion. This is a rotary electric machine drive system.

  According to the present invention, the induced voltage is made variable by changing the number of poles of the rotor according to the rotational speed, and the induced voltage is lowered by switching to a low number of poles in the high-speed rotation range, and the magnetic flux control is weakened to the high-speed rotation range. Therefore, it is possible to realize a pole conversion permanent magnet type rotating electric machine and its drive system that can be operated without energy saving, can save energy, and do not need to switch the connection of the armature windings to convert the number of poles of the rotor.

Explanatory drawing of pole number conversion suitable for operation in a low speed range and a high speed range. 1 is a block diagram of a permanent magnet motor drive system according to a first embodiment of the present invention. 3A is a cross-sectional view showing the permanent magnet magnetization state of the rotor in the 8-pole mode, and FIG. 3B is a cross-sectional view showing the permanent magnet magnetization state of the rotor in the 4-pole mode. FIG. 3 is a specification diagram of the pole number conversion permanent magnet motor of the embodiment. The analysis figure which shows the no-load magnetic flux density distribution in 8-pole mode in the permanent magnet type motor of the said embodiment. The analysis figure which shows the no-load magnetic flux density distribution in 4 pole mode in the permanent magnet type motor of the said embodiment. The graph of the induced voltage of each UVW phase in the 8-pole mode of the permanent magnet motor of the embodiment. The graph of the induced voltage of each UVW phase in the 4-pole mode of the permanent magnet type motor of the said embodiment. The graph of the intensity | strength for every harmonic component of the induced voltage in the 8-pole mode and 4-pole mode of the permanent magnet type motor of the said embodiment. The characteristic diagram of the torque-current phase in the 8-pole mode and 4-pole mode of the permanent magnet motor of the embodiment. The graph which shows the iron loss according to rotation speed in the 8-pole mode and 4-pole mode of the permanent magnet type motor of the said embodiment. The block diagram of the permanent magnet type motor drive system of the 2nd Embodiment of this invention. Explanatory drawing which shows the state of the magnetization magnetic flux at the time of converting a rotor from 8 poles to 4 poles in the permanent magnet type motor of the said embodiment. The block diagram of the permanent-magnet-type motor drive system of the 3rd Embodiment of this invention. The figure which shows the operation | movement which carries out pole number conversion into 8 poles and 4 poles of the rotor of the permanent magnet type motor of the said embodiment. The torque characteristic figure at the time of the rotation in the 8-pole mode and the 4-pole mode of the permanent magnet type motor with the 8-pole main coil arrangement of the above embodiment. The torque characteristic figure at the time of the rotation in the 8-pole mode and the 4-pole mode of the permanent magnet type motor with a 4-pole main coil arrangement of the above embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
One embodiment of the present invention is a 6-slot non-switching pole-changing permanent magnet motor that can generate an 8-pole magnetic field and a 4-pole magnetic field without switching windings, and a drive system thereof. Its basic configuration, operating principle, and basic characteristics are as follows.

[Configuration of the pole conversion permanent magnet motor drive system without winding switching]
As shown in FIG. 1, the pole conversion permanent magnet motor operates as 8 poles in the low speed area, and as 4 poles in the medium to high speed area. Let Thus, by converting the number of poles according to the driving situation, the motor can always be operated in an efficient region.

  FIG. 2 shows a basic configuration of a pole-converting permanent magnet motor drive system without winding switching according to the embodiment. The permanent magnet motor 1 includes a stator 10, a rotor 20, and a rotating shaft 30 fixed at the center of the rotor 20. A drive device 2 including an inverter IV that performs phase sequence switching of the armature winding of the stator 10 and AC power supply and an encoder EN that detects the rotational position of the rotor 20 is connected.

  The stator 10 of the permanent magnet motor 1 is wound with an armature winding 13 so that two types of rotating magnetic fields can be generated using six slots 12 formed on the inner peripheral side of a cylindrical stator core 11. It is. The armature winding 13 is a fractional slot winding, and can generate both 8-pole and 4-pole rotating magnetic fields by switching the phase sequence by the drive device 2. As a result, a mechanical mechanism for changing the connection of the Δ-Y connection of the armature winding by a mechanical electromagnetic contactor, such as a conventional pole conversion induction motor, or changing the connection of the armature winding electronically There is no need for a mechanism (electronic mechanism) that switches to create 8 and 4 poles.

  The rotor 20 has a high coercive force (1600 kA / m) magnet (hereinafter referred to as a fixed magnetic force magnet) 22H1, 22H2 and a low coercive force (420 kA / m) in the rotor core 21 or circumferentially on the circumferential surface. ) Magnets (hereinafter referred to as variable magnetic magnets) 22L1 and 22L2 are arranged so as to be adjacent to each other. For example, during one round clockwise from the left end in FIG. 2, the fixed magnetic magnet 22H2, the variable magnetic magnet 22L1, the variable magnetic magnet 22L2, the fixed magnetic magnet 22H1, the fixed magnetic magnet 22H2,. Each of the four 22H magnets and the four variable magnetic force magnets 22L are arranged so that they are alternately arranged two by two. The low coercivity magnets 22L1 and 22L2 can change the magnetization direction by causing the drive device 2 to pass a short pulse d-axis current to the armature winding 13, thereby reversing the NS poles. The magnitude of the pulsed d-axis current for the magnetization that the drive device 2 flows is large enough to irreversibly change the magnetization direction of the variable magnetic magnets 22L1, 22L2, and the fixed magnetic magnet 22H1, The size is such that 22H2 is not irreversibly demagnetized. In each figure, the permanent magnets 22H and 22L are shown as being affixed to the outer periphery of the rotor core 21, but the permanent magnet is embedded near the circumference of the rotor core 21. It can also be.

  The drive device 2 converts the phase order of the UVW three-phase power flowing through the armature winding 13 of the motor 1 between U-V-W and U-W-V, thereby reducing the total number of poles of the motor to eight. And the number of poles between 4 poles. In this way, only the phase sequence of the voltage applied to the armature winding 13 is switched by the inverter IV included in the drive device 2, and the winding is not switched by switching.

  FIG. 3 shows the formation of magnetic poles by the variable magnetic force magnets 22L1 and 22L2. Regarding the fixed magnetic magnets 22H1 and 22H2, the fixed magnetic magnet 22H1 is fixed at S on the air gap side and N at the rotation center side, and the fixed magnetic magnet 22H2 is fixed at N on the air gap side and S at the rotation center side. (Hereinafter, in the description of N and S in the rotor 20, the magnetic pole appearing on the air gap side is referred to as N or S.) And, when the rotor 20 is switched from 4 poles to 8 poles, it is shown in FIG. As described above, the armature winding 13 is switched to the 8-pole phase sequence, and a positive d-axis current several times the rated value is passed in a pulse manner to magnetize the left variable magnetic magnet 22L1 to N and the right variable magnetic magnet 22L2 to S. Let And it operates as an 8-pole motor by letting a drive current flow in the phase order of 8 poles.

  As shown in FIG. 3 (b), when the rotor 20 is switched from the 8-pole to the 4-pole, a negative d-axis current is made to flow in a pulsed manner in the reverse order of the 8-pole phase sequence, The variable magnetic magnet 22L is magnetized to S and the right variable magnetic magnet 22L2 is magnetized to N. Then, the number of poles is converted to a four-pole motor by changing the phase sequence of the drive current flowing through the armature winding 13 to four poles.

  Alternatively, the pole number conversion is also possible as follows. When switching the rotor 20 from 4 poles to 8 poles, as shown in FIG. 3A, the armature winding 13 is switched in the order of the 8 poles in the same manner as described above, and a positive d that is several times the rated value. An axial current is applied in a pulse manner to magnetize the left variable magnetic magnet 22L1 to N and the right variable magnetic magnet 22L2 to S. And it operates as an 8-pole motor by letting a drive current flow in the phase order of 8 poles. When the rotor 20 is switched from the 8-pole to the 4-pole, the phase of the pulse current at the time of the 8-pole conversion is changed. A pulse current shifted by 180 degrees from the phase of the pulse current at the time of octapole conversion is passed, and the left variable magnetic magnet 22L is magnetized to S and the right variable magnetic magnet 22L2 is magnetized to N as shown in FIG. Then, the number of poles is converted to a four-pole motor by changing the phase sequence of the drive current flowing through the armature winding 13 to four poles.

  As another method, when converting the rotor 20 from 8 poles to 4 poles, the armature windings 13 are switched in order of the 4 poles in the state of the 8 pole rotor of FIG. A positive d-axis current several times as large as the current is pulsed to magnetize the left variable magnetic magnet 22L1 to S and the right variable magnetic magnet 22L2 to N as shown in FIG. And it operates as a 4-pole motor by letting a drive current flow in the phase order of 4 poles.

[Pole conversion characteristics]
The specifications of the embodiment are shown in FIG. FIG. 5 and FIG. 6 show the magnetic flux density distribution when no load is applied to the 8-pole and 4-pole by this specification motor. FIGS. 7 and 8 show induced voltage waveforms when no load is applied to the 8-pole and 4-pole. Thus, it can be confirmed that the number of poles has been changed from eight to four by converting the polarities of the variable magnetic magnets 22L1 and 22L2.

  FIG. 9 shows harmonic components of the induced voltage waveform when no load is applied to the 8-pole and 4-pole. The amplitude value of the fundamental wave component at 8 poles is 223.4V, and 182.7V at 4 poles. Therefore, when the number of poles is converted from 8 poles to 4 poles, the induced voltage can be reduced from 100% to 82%. Thereby, by switching from 8 poles to 4 poles, it is possible to widen the rotation range without weakening the magnetic flux control to a higher speed range.

  FIG. 10 shows the torque-current phase characteristics. The maximum torque of 8 poles is 60 Nm at a current phase of about 90 degrees, and the maximum torque of 4 poles is 44.3 Nm at a current phase of 114 degrees, and a reluctance torque component is also used. The 8-pole average torque is 61.3 Nm, and the 4-pole average torque is 34.8 Nm.

  Iron loss was analyzed in order to confirm the possibility of improving the efficiency in the high-speed rotation range by changing the number of poles of the motor. FIG. 11 shows the iron loss characteristics of the stator when there is no load. By converting from 8 poles to 4 poles in the entire operating range, iron loss is reduced by 60%. As a result, the iron loss is large, and the iron loss is reduced by converting from 8 poles to 4 poles in a high speed range that does not require high torque, so that the efficiency is improved.

  According to the pole number conversion permanent magnet motor drive system of the present embodiment, the number of poles can be converted from eight poles to four poles by changing the magnetization direction of the permanent magnet without switching the windings. As a result, the induced voltage can be kept low by converting the number of poles from 8 poles to 4 poles in the high speed range, a wide variable speed operation range can be obtained, and the iron loss can be reduced by about 60%. High-efficiency operation over a wide range is possible.

[Second Embodiment]
The pole number variable permanent magnet type motor drive system with no coil switching of the second embodiment shown in FIG. 12 is a 9-slot coil without switching coil that creates an octupole magnetic field and a quadrupole magnetic field without coil switching. It is composed of a conversion permanent magnet motor 1A and its drive device 2.

  The pole conversion permanent magnet motor 1A is also operated with 8 poles in the low speed rotation range and 4 poles in the medium to high speed rotation range, and is inserted through the stator 10A and the rotor 20 and the center of the rotor 20. A drive device 2 including an inverter IV that performs phase switching of the armature winding of the stator 10A and AC power supply and an encoder EN that detects the rotational position of the rotor 20 is connected to the rotary shaft 30. ing.

  The stator 10A of the permanent magnet motor 1A has an armature winding 13A wound so that two types of rotating magnetic fields can be generated using nine slots 12 formed on the inner peripheral side of the cylindrical stator core 11. It is. The armature winding 13A is also a fractional slot winding, and can generate both 8-pole and 4-pole rotating magnetic fields by switching the phase order by the drive device 2, and constitutes the armature winding. A mechanism for making the 8-pole and 4-pole by mechanically or electronically switching the connection is unnecessary.

  The configuration of the rotor 20 in the present embodiment is the same as that of the first embodiment shown in FIG. 2, and therefore, in FIG. 12, elements common to FIG. It is. The low coercivity magnets 22L1 and 22L2 cause the NS direction to be reversed by changing the magnetization direction by causing the drive device 2 to pass a short pulse d-axis current through the armature winding 13A.

  The drive device 2 converts the phase order of the UVW three-phase power source flowing through the armature winding 13A of the motor 1 between U-V-W and U-W-V, thereby reducing the total number of poles of the motor to eight. And the number of poles between 4 poles. This is the same as that of the first embodiment, and only the phase sequence of the voltage applied to the armature winding 13A by the inverter IV is switched, and mechanical or electronic winding switching is not required.

  FIG. 12 shows a state in which the rotor 20 has eight poles. In FIG. 12, the left fixed magnetic magnet 22H1 of the fixed magnetic magnets 22H1 and 22H2 directly above both sides has an N pole on the air gap side, and the right fixed magnetic magnet 22H2 has an S pole on the air gap side. . The fixed magnetic magnets 22H1, 22H2 on both sides just below are also arranged 180 degrees symmetrically with the fixed magnetic magnets 22H1, 22H2 on both sides just above. When the rotor 20 is switched from 4 poles to 8 poles, the armature winding 13A is switched in order of the 8 pole phases, and a positive d-axis current several times the rated value is passed in a pulsed manner to change the upper left variable magnetic magnet. 22L2 is magnetized to S and the variable magnet 22L1 on the lower left side is magnetized to N. Similarly, the upper right variable magnetic magnet 22L2 is magnetized to N, and the lower right variable magnetic magnet 22L1 is magnetized to S. The drive device 2 is operated as an 8-pole motor by causing a drive current to flow in the 8-pole phase sequence.

  As shown in FIG. 13, when the rotor 20 is switched from 8 poles to 4 poles, the drive device 2 causes the negative d-axis current to flow in the pulse direction in the 8-pole phase sequence, The upper left variable magnetic magnet 22L2 is magnetized to N, and the lower left variable magnetic magnet 22L1 is magnetized to S. Similarly, the upper right variable magnetic magnet 22L2 is magnetized to S and the lower right variable magnetic magnet 22L1 is magnetized to N. The drive device 2 converts the number of poles into a four-pole motor by changing the phase sequence of the drive current flowing through the armature winding 13A to four poles.

  Here, pole number conversion from 4 poles to 8 poles and vice versa can also be performed by another method similar to that of the first embodiment.

  Even in the permanent magnet type motor drive system of the present embodiment, the number of poles can be changed from 8 poles to 4 poles by changing the magnetization of the permanent magnets without switching the windings. This reduces the induced voltage by converting the number of poles from 8 poles to 4 poles in the high speed range, and a wide variable speed operating range can be obtained, iron loss can be reduced, and a wide range from low speed to high speed can be obtained. Highly efficient operation is possible.

[Third Embodiment]
The fluid device system such as wind power generation requires characteristics opposite to those described above. That is, a low torque is required in the low speed rotation range, and a high torque is required in the high speed rotation range. Even in such a use, the present invention can obtain an excellent characteristic that is not present in the past due to a similar action, although the characteristic is opposite to that described above.

  A third embodiment is shown in FIGS. In each figure, the same or similar components as those in the first embodiment are denoted by the same or similar reference numerals.

  The stator 10 is configured as a three-phase 18-slot fractional groove winding, and is converted into 8-pole and 4-pole. The arrangement of the coil 12 is an eight-pole coil arrangement. The 8-pole main body is an arrangement in which the coil pitch is close to the pole pitch when there are 8 poles, and the coil pitch becomes shorter when there are 4 poles. Conversely, the arrangement of the coil 12 may be a four-pole coil arrangement. The 4-pole main body is an arrangement in which the coil pitch is close to the pole pitch when there are 4 poles, and the coil pitch is shortened when there are 8 poles.

  The rotor 20 has a configuration in which four high coercive force permanent magnets (fixed magnetic force magnets) 22 </ b> H and four low coercive force permanent magnets (variable magnetic force magnets) 22 </ b> L are installed on the outer periphery of the rotor core 21. Two fixed magnetic magnets 22H and two variable magnetic magnets 22L are arranged next to each other, and eight permanent magnets are arranged in total.

  As shown in FIG. 15, when the rotor 20 is converted from 8 poles to 4 poles, the upper left magnetic variable magnet 22L is magnetized and the polarity is inverted from N to S in the circled figure, and the upper right The variable magnetic magnet 22L is magnetized to reverse the polarity from S to N. The same applies to the lower left variable magnetic magnet 22L and the lower right variable magnetic magnet 22L not shown. Conversely, when the rotor 20 is converted from 4 poles to 8 poles, the polarity is reversed by the reverse magnetization.

  FIG. 16 shows torque characteristics at the time of pole number conversion in the rotating electrical machine of the present embodiment in which the coil arrangement is mainly composed of eight poles. A curve 51 shows torque characteristics at the time of 8-pole load, a curve 53 shows torque characteristics at the time of 4-pole load, a straight line 52 shows average torque at the time of 8 poles, and a straight line 54 shows average torque at the time of 4 poles. In the 8-pole mode used in the low-speed rotation region, the torques 51 and 52 are large, and in the 4-pole mode in the high-speed rotation region, the torques 53 and 54 are small. Characteristics close to the constant output characteristics required for motors such as electric cars and trains can be obtained.

  On the other hand, FIG. 17 shows the torque characteristics when changing the number of poles in the rotating electrical machine of the present embodiment in which the coil arrangement is mainly composed of four poles. A curve 61 shows torque characteristics at the time of 4-pole load, a curve 63 shows torque characteristics at the time of 8-pole load, a straight line 62 shows average torque at the time of 4 poles, and a straight line 64 shows average torque at the time of 8 poles. In the 8-pole mode used in the low-speed rotation region, the torques 63 and 64 are small, and in the 4-pole mode in the high-speed rotation region, the torques 61 and 62 are large. Characteristics close to the reduced torque characteristics required for fluid generators such as wind power generation, ocean current power generation, and hydroelectric power generation for rivers and drainage can be obtained.

  The present invention is not limited to the above-described embodiments, and is widely applied to permanent magnet type motors and their drive systems, and permanent magnet type rotating electrical machines such as permanent magnet type generators and power generation systems therefor, and their drive systems. Applicable. Further, the number of variable magnetic permanent magnets of the rotor, the number of slots of the stator, and the number of armature coils can be changed. Furthermore, in the above embodiment, the rotor 20 has a configuration in which two types of magnets, that is, high coercive force magnets (fixed magnetic force magnets) 22H1, 22H2 and low coercive force magnets (variable magnetic force magnets) 22L1, 22L2, are installed. A configuration with only a low coercive force variable magnet is also possible. However, the magnetic field for magnetizing the permanent magnet is a magnetic field having the same number of poles as the number of poles to be changed.

DESCRIPTION OF SYMBOLS 1,1A Permanent magnet type motor 2 Drive apparatus 10 Stator 11 Stator core 12 Slot 13, 13A Armature winding 20 Rotor 21 Rotor core 22H, 22H1, 22H2 Fixed magnetic magnet 22L, 22L1, 22L2 Variable magnetic magnet 30 Rotating shaft IV Inverter EN Encoder

Claims (14)

A stator having an armature winding that generates a rotating magnetic field of a plurality of types of poles;
A permanent magnet type rotating electrical machine comprising a rotor having a permanent magnet magnetized by an external magnetic field. A stator having an armature winding that generates a rotating magnetic field of a plurality of types of poles;
A permanent magnet type rotating electric machine comprising: a rotor having a permanent magnet magnetized by a magnetic field generated by an armature current of the stator.   3. The permanent magnet type rotating electric machine according to claim 1, wherein the armature winding of the stator is composed of a fractional slot armature winding that generates a rotating magnetic field having a plurality of types of poles.   The first winding number is a first winding pitch that is close to the pole pitch, and the second winding number that is shorter than the first winding pitch is a second winding pitch that is shorter than the first winding pitch. The permanent magnet type rotating electric machine according to any one of claims 1 to 3, further comprising a configured armature winding.   The first winding number is a first winding pitch that is close to the pole pitch, and the second winding number that is greater than the first pole number is a second winding pitch that is shorter than the first winding pitch. The permanent magnet type rotating electric machine according to any one of claims 1 to 3, further comprising a configured armature winding.   The number of poles of the rotor is changed by magnetizing the permanent magnet by a magnetic field generated by the armature current of the current phase after the change due to the change of the current phase of the armature current. The permanent magnet type rotating electrical machine according to any one of 5.   The permanent magnet rotation according to any one of claims 1 to 6, wherein a coercive force of a permanent magnet magnetized by the external magnetic field or a magnetic field generated by an armature current is 500 kA / m or less. Electric. A permanent magnet type rotating electric machine composed of a stator having an armature winding that generates a rotating magnetic field having a plurality of types of poles, and a rotor having a permanent magnet magnetized by an external magnetic field;
A permanent magnet type rotating electrical machine drive system comprising: a drive device that converts the number of poles of the rotor by magnetizing the permanent magnet and rotates the rotor by the number of poles after the conversion. Permanent magnet rotation comprising a stator having an armature winding that generates a rotating magnetic field having a plurality of types of poles, and a rotor having a permanent magnet magnetized by a magnetic field generated by an armature current of the stator Electric
A permanent magnet type rotating electrical machine drive system comprising: a drive device that converts the number of poles of the rotor by magnetizing the permanent magnet and rotates the rotor by the number of poles after the conversion.   10. The permanent magnet type rotary electric machine drive according to claim 8, wherein the armature winding of the stator is composed of a fractional slot armature winding that generates a rotating magnetic field having a plurality of types of poles. system.   The first winding number is a first winding pitch that is close to the pole pitch, and the second winding number that is shorter than the first winding pitch is a second winding pitch that is shorter than the first winding pitch. The permanent magnet type rotating electrical machine drive system according to any one of claims 8 to 10, further comprising a configured armature winding.   The first winding number is a first winding pitch that is close to the pole pitch, and the second winding number that is greater than the first pole number is a second winding pitch that is shorter than the first winding pitch. The permanent magnet type rotating electrical machine drive system according to any one of claims 8 to 10, further comprising a configured armature winding.   The current phase of the armature current is changed, and the permanent magnet is magnetized by a magnetic field generated by the armature current of the current phase to change the number of poles of the rotor. A permanent magnet type rotating electrical machine drive system according to claim 1.   The permanent magnet rotation according to any one of claims 8 to 13, wherein a coercive force of a permanent magnet magnetized by the external magnetic field or a magnetic field generated by an armature current is 500 kA / m or less. Electric drive system.