JP2017077133A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine that is excellent in cost and resource supply, and that can improve a torque density by increasing a torque generation surface.SOLUTION: A stator 100 has: an annular stator core 110 having stator teeth 130 arranged at a predetermined interval in a circumferential direction; and an armature coil 140 wound toroidally between the adjacent stator teeth 130 of the stator core 110. A rotor 200 has: a rotor core 210 that has first rotor teeth and second rotor teeth opposed to the stator teeth 130 at both surface sides in an axial direction of the stator core 110, and third rotor teeth opposed to the stator teeth 130 at an outer surface side in a radial direction of the stator core 110; an induction coil I that induces an induction current by interlinkage of a magnetic flux generated at the stator 100 side; and a field coil F that generates the magnetic field by energization of the induction current.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotating electrical machine provided with a plurality of rotor torque generating surfaces for a stator.

  In Patent Document 1, an annular stator having a stator core in which an armature winding is toroidally wound, a radial rotor facing radially inward with respect to the stator, and one axial direction of a rotating shaft with respect to the stator There is disclosed a rotating electrical machine that includes two axial rotors facing each other on the side and the other side, and has three rotor torque generating surfaces with respect to the stator.

  In each of the radial rotor and the two axial rotors of the rotating electrical machine disclosed in Patent Document 1, permanent magnets are arranged at predetermined intervals in the circumferential direction. This rotating electrical machine generates torque in the radial rotor and the two axial rotors by the interaction between the rotating magnetic field generated in the stator and the field magnetic fluxes of the permanent magnets of the radial rotor and the two axial rotors.

JP 2010-226808 A

  However, the rotating electrical machine disclosed in Patent Document 1 uses permanent magnets to form magnetic poles in the radial rotor and the two axial rotors. For this reason, when a rare earth magnet with a small recoverable reserve and uneven mine location is used as the permanent magnet provided on the radial rotor and the two axial rotors, the material cost increases or a stable resource There is a risk that supply cannot be secured.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a rotating electrical machine that is excellent in terms of cost and resource supply and that can improve torque density by increasing the torque generation surface. .

  One aspect of the invention of a rotating electrical machine that solves the above problems is a rotating electrical machine that includes a stator that generates magnetic flux by energizing a coil, and a rotor that rotates when the magnetic flux passes through the stator. An annular stator core having stator teeth arranged at a predetermined interval; and an armature coil wound toroidally between adjacent stator teeth of the annular stator core, wherein the rotor is in the axial direction of the stator core A rotor core having a rotor tooth facing the stator teeth on both sides of the stator core, and a rotor tooth facing the stator teeth on a radially outer surface side of the stator core, and wound on the rotor teeth, the stator side An induction coil for inducing an induced current by linkage of magnetic flux generated in the rotor, and the rotor teeth It rolled and have a magnetic coil field for generating a magnetic field by energization of the induction current.

  According to one embodiment of the present invention, it is possible to provide a rotating electrical machine that is excellent in terms of cost and resource supply and that can improve torque density by increasing the torque generation surface.

FIG. 1 is a diagram showing a rotating electrical machine according to an embodiment of the present invention, and is a perspective view showing an overall configuration of the rotating electrical machine. FIG. 2 is a diagram illustrating the rotating electrical machine according to the embodiment of the present invention, and is a cross-sectional view of the rotating electrical machine cut along a plane passing through the rotating shaft. FIG. 3 is a diagram showing a rotating electrical machine according to an embodiment of the present invention, and is a perspective view of a stator. FIG. 4 is a view showing a rotating electrical machine according to an embodiment of the present invention, and is a perspective view of a stator core. FIG. 5 is a view showing a rotating electrical machine according to an embodiment of the present invention, and is a perspective view of an armature coil. FIG. 6 is a diagram illustrating a rotating electrical machine according to an embodiment of the present invention, and is a diagram illustrating a magnetic flux distribution of a stator. FIG. 7 is a view showing a rotating electrical machine according to an embodiment of the present invention, and is a perspective view of a rotor. FIG. 8 is a diagram showing a rotating electrical machine according to an embodiment of the present invention, and is a perspective view of a rotor core. FIG. 9 is a view showing another example of the stator holding structure in the rotating electrical machine according to the embodiment of the present invention, and is a cross-sectional view of the rotating electrical machine cut along a plane passing through the rotating shaft.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIGS. 1-9 is a figure explaining the rotary electric machine which concerns on one Embodiment of this invention.

(Schematic configuration of rotating electrical machine)
1 and 2, the rotating electrical machine 1 includes a stator 100 that generates a magnetic flux by energizing a coil, and a rotor 200 that rotates by the passage of the magnetic flux. The stator 100 is disposed closer to the rotating shaft 1C than the rotor 200. The rotation shaft 1 </ b> C is a rotation center line of the rotor 200.

  The rotating electrical machine 1 includes a shaft 20 on the rotating shaft 1C. The shaft 20 is fixed to the inner peripheral portion of the rotor 200 and rotates integrally with the rotor 200.

  The rotating electrical machine 1 includes a case 10 that covers the stator 100 and the rotor 200. The inner peripheral edge of the case 10 on one side in the axial direction of the rotating electrical machine 1 supports the shaft 20 via the bearing 2 so as to be rotatable. In addition, the inner peripheral edge of the case 10 on the other side in the axial direction of the rotating electrical machine 1 supports the shaft 20 via the bearing 3 so as to be rotatable. Here, in FIGS. 1, 3, 4, 7, and 8, the lower side is one side in the axial direction of the rotating electrical machine 1 and the upper side is the other side in the axial direction of the rotating electrical machine 1.

  Furthermore, the case 10 includes a holding portion 10A. The holding portion 10A extends from one side in the axial direction to the other side in the inner peripheral edge of the case 10, and then holds the stator core 110 of the stator 100 from the inner peripheral side. doing. As described above, the case 10 holds the stator 100 in a stationary state by holding the stator 100 from the inner peripheral side by the holding portion 10A.

  As will be described later in detail, the rotating electrical machine 1 generates an induced current in the induction coil I of the rotor 200 by a rotating magnetic field generated by energizing the armature coil 140 of the stator 100. And the rotary electric machine 1 makes the rotor 200 function as an electromagnet by energizing the field coil F of the rotor 200 with this induced current as a field current, and generates torque. Thus, the rotating electrical machine 1 is configured as a magnet-free self-excited wound field synchronous motor.

(Stator)
1, 2, 3, and 4, the stator 100 includes an annular stator core 110 and an armature coil 140 wound around the stator core 110. The stator core 110 is made of a high permeability magnetic material formed in an annular shape concentric with the rotating shaft 1C.

  The stator core 110 includes an annular stator yoke 120 and a plurality of stator teeth 130 provided on the stator yoke 120 at predetermined intervals in the circumferential direction. The stator yoke 120 has a circular or oval cross-sectional shape.

  The stator teeth 130 protrude from the surface of the stator yoke 120 and are formed in a trapezoidal shape when viewed from the axial direction of the rotating electrical machine 1 and a rectangular cross section in the circumferential direction of the rotating electrical machine 1. Twelve stator teeth 130 are provided at predetermined intervals in the circumferential direction on the stator yoke 120.

  Specifically, the stator tooth 130 includes a first stator tooth 131, a second stator tooth 132, and a third stator tooth 133.

  The first stator teeth 131 are provided on one side of the stator yoke 120 in the axial direction of the rotating electrical machine 1, and project from the stator yoke 120 to one side of the rotating electrical machine 1 in the axial direction.

  The second stator teeth 132 are provided on the other side of the stator yoke 120 in the axial direction of the rotating electrical machine 1 and protrude from the stator yoke 120 to the other side of the rotating electrical machine 1 in the axial direction.

  The third stator teeth 133 are provided on the outer peripheral surface side of the rotating electrical machine 1 in the stator yoke 120 and project from the stator yoke 120 to the outer peripheral surface side of the rotating electrical machine 1.

  In the present embodiment, the stator core 110 is not divided and has an integral (one-piece) annular structure. For this reason, the mechanical strength of the stator core 110 can be improved as compared with the case where the stator core 110 is divided. Further, the stator core 110 can have sufficient resistance against excitation vibration due to the improved mechanical strength.

  Armature coil 140 is toroidally wound around annular stator yoke 120 with a slot between adjacent stator teeth 130 of stator core 110 as a slot. The toroidal winding is a method in which the winding 141 is wound around the stator yoke 120 alternately through the inside and the outside of the ring of the stator yoke 120.

  Thus, by adopting the structure in which the armature coil 140 is toroidally wound on the stator yoke 120, the stator core 110 can be integrated with the stator yoke 120, and the mechanical strength of the stator core 110 can be improved. Can do.

  The armature coil 140 is disposed between the stator teeth 130 and an intermediate position between the stator teeth 130 that are adjacent to the stator teeth 130 in the circumferential direction. The armature coil 140 corresponds to any of the U-phase, V-phase, and W-phase of three-phase alternating current.

  The pair of armature coils 140 facing in the circumferential direction across the stator teeth 130 is composed of magnetic flux generated from one armature coil 140 and magnetic flux generated from the other armature coil 140, and the direction of the magnetic flux is circumferential. The winding direction and energization direction are set so as to be opposite to each other.

  Thus, for example, when one armature coil 140 is in the U + phase and the other armature coil 140 is in the U− phase, the magnetic flux from one armature coil 140 and the other armature coil 140 toward the stator teeth 130 is increased. Occur.

  In FIG. 5, the winding 141 of the armature coil 140 is a rectangular wire having a rectangular cross section. The armature coil 140 is wound around the stator yoke 120 of the stator core 110 with the winding 141 in a toroidal winding state by edgewise winding. The edgewise winding is a method in which the winding 141 is wound vertically with the short side of the winding 141 facing the inner side and the outer side of the rotating electric machine 1 with respect to the stator yoke 120.

  Thereby, since the windings 141 adjacent in the winding pitch direction are in surface contact with each other on the long side, the number of turns can be increased while ensuring a cross-sectional area corresponding to the current, so the space factor of the armature coil 140 can be improved, The magnetomotive force of the stator 100 can be increased.

  Further, since the windings 141 adjacent to each other in the winding pitch direction are in surface contact with each other with long sides, heat conduction can be performed uniformly with a large area between the windings 141. Thereby, heat conduction is dispersed and heat dissipation can be improved.

  In addition, since both end portions 141A and 141B that are the beginning or end of winding of the winding 141 can be arranged on the same surface on the inner peripheral side of the stator 100, connection of the plurality of armature coils 140 can be facilitated.

(Magnetic flux distribution of stator)
FIG. 6 is a diagram showing the magnetic flux distribution of the stator 100 obtained by electromagnetic field analysis. In FIG. 6, the stator core 110 and the rotor 200 are shown in a straight line for easy explanation. In FIG. 6, the first stator teeth 131, the second stator teeth 132, or the third stator teeth 133 are simply indicated as the stator teeth 130 without being distinguished from each other. FIG. 6 shows an analysis result when the current is supplied with the current amplitude of the V phase set to 1 as the reference value and the current amplitude values of the U phase and the W phase set to −0.5, respectively.

  In FIG. 6, when one of the pair of armature coils 140 adjacent in the circumferential direction with the stator teeth 130 interposed therebetween is the V + phase and the other is the V− phase, the magnetic flux generated from the pair of armature coils 140 is a pair of armature coils 140. This occurs toward the stator teeth 130 sandwiched by the armature coils 140 and collides with the stator teeth 130. Then, the magnetic flux generated in the stator teeth 130 changes its direction in a direction perpendicular to the stator yoke 120 and travels from the stator teeth 130 to the rotor 200.

  A part of the magnetic flux directed toward the rotor 200 passes through a rotor core 210 (to be described later) of the rotor 200, and then travels toward the stator teeth 130 sandwiched between the pair of armature coils 140 of the W + phase and the W− phase. Further, the remaining part of the magnetic flux directed toward the rotor 200 passes through a rotor core 210 (to be described later) of the rotor 200, and then proceeds to the stator teeth 130 sandwiched between a pair of armature coils 140 of U + phase and U− phase.

  Thus, the magnetic circuit of the magnetic flux generated by the armature coil 140 is formed on the surface where the stator teeth 130 and the rotor 200 face each other. The rotating electrical machine 1 uses a surface on which the stator teeth 130 and the rotor 200 face each other as a torque generating surface.

  For this reason, the torque density can be increased by effectively using the magnetic flux generated by the armature coil 140 as the torque generation surface increases. Torque density means the magnitude of torque per volume.

  The rotor 200 includes three torque generation surfaces including both the axial side surfaces and the outer peripheral surface side of the rotating electrical machine 1 to increase the torque density. In this way, by increasing the torque generating surface, the rotating electrical machine 1 is small and can generate high torque, so that it can be particularly excellent as a rotating electrical machine mounted on a hybrid vehicle or the like.

(Rotor)
1, 2, 7, and 8, the rotor 200 includes a rotor core 210, an induction coil I, and a field coil F.

  The rotor core 210 has two disk-shaped disk portions 211 and 212, and a cylindrical cylindrical portion 213 that is continuous with the outer extension of the disk portions 211 and 212.

  The disk parts 211 and 212 are arranged on a plane orthogonal to the rotary shaft 1C so as to cover the stator core 110 from one side and the other side in the axial direction. Through holes 211A and 212A are provided in the center of the disk portions 211 and 212, respectively, and the shaft 20 passes through the through holes 211A and 212A.

  The cylindrical portion 213 is disposed so as to cover the stator core 110 from the outside in the radial direction. The rotor core 210 is made of a high permeability magnetic material.

  Thus, the rotor core 210 is formed in a cylindrical shape as a whole so as to cover the stator 100 on the three surfaces of the stator 100 on both sides in the axial direction and the outer surface in the radial direction.

  In other words, the rotor core 210 is formed in a cylindrical shape having a U-shaped cross section with the two disk portions 211 and 212 and the cylindrical portion 213 as sides, and the stator core 110 is directed from the outer peripheral side toward the inner peripheral side. Covered.

  An induction coil I and a field coil F are disposed on the surface of the rotor core 210 on the stator core 110 side, as will be described later. For this reason, since the induction coil I and the field coil F can be supported on the inner peripheral surface of the rotor core 210, it is possible to prevent the induction coil I and the field coil F from jumping out due to centrifugal force. The strength can be improved.

  In addition, the rotor core 210 includes a first rotor tooth 231, a second rotor tooth 232, and a third rotor tooth 233 at the same circumferential position.

  The first rotor teeth 231, the second rotor teeth 232, and the third rotor teeth 233 have torque generation surfaces between the first stator teeth 131, the second stator teeth 132, and the third stator teeth 133 of the stator 100, respectively. Forming.

  The first rotor teeth 231 are provided on the other surface in the axial direction of the disk portion 211, and protrude from the disk portion 211 toward the other side in the axial direction toward the stator core 110. The first rotor teeth 231 face the first stator teeth 131 in the axial direction with a predetermined air gap.

  The second rotor teeth 232 are provided on one surface of the disk portion 212 in the axial direction, and protrude from the disk portion 212 toward the stator core 110 on one side in the axial direction. The second rotor teeth 232 are opposed to the second stator teeth 132 in the axial direction with a predetermined air gap therebetween.

  The third rotor teeth 233 are provided on the radially inner surface of the cylindrical portion 213, and protrude inward in the radial direction from the cylindrical portion 213 toward the stator core 110. The third rotor teeth 233 are opposed to the third stator teeth 133 in the radial direction with a predetermined air gap therebetween.

  The radially outer end portion of the first rotor teeth 231 is continuous with the end portion on the one side in the axial direction of the third rotor teeth 233. Further, the radially outer end portion of the second rotor teeth 232 is continuous with the end portion on the other side in the axial direction of the third rotor teeth 233.

  Thus, the rotor core 210 is provided with a plurality of rotor teeth 230 at equal intervals in the circumferential direction.

(Divided structure of rotor core)
Since the rotor core 210 has a U-shape that covers the stator core 110 from the outer peripheral side, in this embodiment, the rotor core 210 is divided so that the rotating electrical machine 1 can be assembled.

  In the present embodiment, the rotor core 210 is divided into a first rotor core 210A on one side in the axial direction and a second rotor core 210B on the other side in the axial direction at an intermediate position in the axial direction.

  Thereby, the rotary electric machine 1 can be assembled by connecting the divided first rotor core 210A and second rotor core 210B so as to sandwich the stator core 110 in the axial direction.

  In addition, since the first rotor core 210A and the second rotor core 210B can be formed in the same shape by dividing the rotor core 210 at the intermediate position in the axial direction, all or part of the manufacturing process of the first rotor core 210A and the second rotor core 210B. Can be made common.

  The rotating electrical machine 1 includes a holding ring 4B. The retaining core 4 </ b> B is fitted or screwed into the shaft 20, so that the rotor core 210 is fixed to the shaft 20.

  Key grooves (not shown) are formed in the inner peripheral portion of the rotor core 210 and the outer peripheral portion of the shaft 20. The rotor core 210 is prevented from rotating with respect to the shaft 20 when the key is inserted into the key groove, and can rotate integrally.

(Induction coil, field coil)
The winding Iw of the induction coil I and the winding Fw of the field coil F are made of a flat wire in which a copper wire having a rectangular cross section is covered with an insulating material. The induction coil I and the field coil F are constituted by winding the windings Iw and Fw by α. Here, the α winding is a method in which the winding start and the winding end of the windings Iw and Fw are simultaneously wound outward.

  The induction coil I and the field coil F wound in this way have an improved space factor because the winding start side ends of the windings Iw and Fw are not left inside, and both ends of the windings Iw and Fw are improved. Since the part is arranged outside the induction coil I and the field coil F, the connection can be easily performed.

  In the present embodiment, the winding Iw of the induction coil I is wound in two rows in the winding pitch direction, and the end of the first row and the end of the second row of the winding Iw are on the same surface in the rotor 200. Pulled out to the side.

  Further, the winding Fw of the field coil F is wound in two rows in the winding pitch direction, and the end of the first row and the end of the second row of the winding Fw are on the same surface side in the rotor 200. Has been pulled out.

  Since the induction coil I and the field coil F wound in this way can be arranged with the ends of the windings Iw and Fw being drawn out to the same inner surface (inner surface) of the rotor 200, By using connection parts such as a connection board (not shown) arranged on the inner peripheral surface side, connection can be easily performed on the same surface.

  Further, by arranging the end portions of the windings Iw and Fw of the induction coil I and the field coil F on the inner peripheral surface side of the rotor 200, the end portions of the windings Iw and Fw protrude toward the outer peripheral surface side of the rotor 200. Therefore, the physique of the rotating electrical machine 1 can be reduced.

  Since the induction coil I and the field coil F are wound by α, the space factor can be improved and the copper loss can be reduced.

  Further, the induction coil I and the field coil F are wound so that the short sides of Iw and Fw made of a rectangular wire are perpendicular to the magnetic flux generation direction.

  Thereby, the eddy current loss which generate | occur | produces with the induction coil I and the field coil F can be reduced.

  The induction coil I and the field coil F are formed in a shape obtained by bending α-wound windings Iw and Fw into a U-shape.

  Specifically, the field coil F is bent in a U shape along the inner surface of the U-shaped rotor core 210 and around the base end portion of the rotor teeth 230.

  On the other hand, the induction coil I is bent in a U shape along the inner surface of the U-shaped field coil F and around the tip of the rotor teeth 230.

  As described above, the induction coil I and the field coil F are arranged such that the induction coil I and the field coil F are arranged on the front end side and the base end side of the same rotor tooth 230, respectively. Arranged in layers. For this reason, the induction coil I is disposed closer to the stator 100 side of the rotor teeth 230 than the field coil F.

The induction coil I configured as described above induces an induced current by linkage of magnetic flux generated on the stator 100 side when a rotating magnetic field is generated in the armature coil 140.
(Rectifier circuit)

  Here, a diode (not shown) is provided as a rectifier in the rotor 200, and the diode, the induction coil I, and the field coil F are connected so as to constitute a rectifier circuit. In this rectifier circuit, the alternating induction current generated in the induction coil I is rectified by the diode, and the rectified direct current is supplied to the field coil F as a field current. The field coil F generates a magnetic field when energized as a field current.

(Field energy)
The rotating electrical machine 1 includes twelve stator teeth 130 and eight rotor teeth 230. For this reason, the component ratio S / P between the number of slots S (12) of the stator 100 and the number of magnetic poles P (8) of the rotor 200 is 3/2.

  Further, in the rotating electrical machine 1 of the present embodiment, since the armature coil 140 formed in toroidal winding is concentratedly wound, the magnetic flux of the fundamental frequency is spatially a secondary space in a stationary coordinate system as a leakage flux. Harmonics are superimposed about 50%.

  Therefore, by setting the composition ratio S / P to 3/2, the third-order harmonics are interlinked with the rotor 200 in terms of time in the rotating coordinate system. The third time harmonic generated in the rotating coordinate system has an asynchronous frequency with respect to the rotational speed of the rotor 200.

  For this reason, the induction coil I is wound around the rotor teeth 230 that are salient poles of the rotor 200 to generate an induced current by interlinking the third time harmonics in the induction coil I, and the induced current is rectified. By using the current as the field current, a field can be generated in the field coil F, and the rotor 200 can function as an electromagnet.

  Here, the high-order time harmonic magnetic flux such as the fourth order or the fifth order in the rotating coordinate system is only a waveform that vibrates only in the vicinity of the surface of the rotor core 210, so that an induction current is efficiently generated in the induction coil I. I can't. On the other hand, low-order spatial harmonics such as third-order time harmonics can be linked to the inside of the rotor core 210 because of the relatively low frequency magnetic flux.

  In the present embodiment, of the spatial harmonic components superimposed on the magnetic flux of the fundamental frequency, the third time harmonic is targeted for recovery, and this third time harmonic is the fundamental frequency input to the armature coil 140 or The frequency is higher than the second-order time harmonic and pulsates in a short period.

  For this reason, the loss energy of the spatial harmonic component can be efficiently recovered, the time change of the magnetic flux linked to the induction coil I can be increased, the induced current can be increased, and a large rotational torque can be obtained. .

(Other examples of stator holding structure)
Here, in FIG. 2, the stator 100 is held stationary from the inner peripheral side by the holding portion 10 </ b> A of the case 10. However, as shown in FIG. 9, the stator 100 is held stationary by the shaft 20. May be.

  In FIG. 9, the shaft 20 includes a hollow first shaft 20B disposed on one side in the axial direction, a solid second shaft 20C disposed on the other side in the axial direction, and the first shaft 20B. And a holding shaft 20D supported between the second shaft 20C and the second shaft 20C. The first shaft 20B and the second shaft 20C are fixed to the rotor core 210 by holding rings 4A and 4B. The first shaft 20B and the second shaft 20C are connected so as to be rotatable relative to the holding shaft 20D.

  The holding shaft 20D includes a holding portion 20E and a fixing portion 20F. The holding portion 20E extends radially outward from the holding shaft 20D and is connected to the inner peripheral portion of the stator 100 (specifically, the stator core 110).

  The fixed portion 20F extends from the holding shaft 20D to one side in the axial direction, and is held stationary by being fixed to the outside of the rotating electrical machine 1 through the inside of the first shaft 20B. In this way, the holding portion 20F is held in a stationary state, whereby the holding shaft 20D holds the stator 100 in a stationary state via the fixing portion 20F.

  The effect of the rotary electric machine 1 of this embodiment demonstrated as mentioned above is demonstrated. In the rotating electrical machine 1 of the present embodiment, the stator 100 includes a toroidal winding between an annular stator core 110 having stator teeth 130 arranged at a predetermined interval in the circumferential direction and an adjacent stator tooth 130 of the annular stator core 110. Armature coil 140.

  The rotor 200 includes a first rotor tooth 231 and a second rotor tooth 232 that face the stator teeth 130 on both sides in the axial direction of the stator core 110, and a first face that faces the stator teeth 130 on the radially outer surface side of the stator core 110. And a rotor core 210 having three rotor teeth 233.

  Further, the rotor 200 is wound around the rotor teeth 230, and is wound around the induction coil I that induces an induced current by the linkage of magnetic flux generated on the stator 100 side, and the rotor teeth 230, and is energized by the energization of the induced current. A field coil F for generating a magnetic field.

  According to the present embodiment, an induction current can be generated in the induction coil I by linkage of magnetic flux generated on the stator 100 side, and a field current is applied to the field coil F using a DC current obtained by rectifying the induction current as a field current. Therefore, the rotor 200 can function as an electromagnet, and the rotational torque of the rotor 200 can be obtained.

  For this reason, since the rotational torque of the rotor 200 can be obtained without using a permanent magnet, the use of a rare earth magnet as the permanent magnet can prevent the material cost from increasing or the resource supply from becoming unstable. Thereby, the rotary electric machine 1 excellent in terms of cost and resource supply can be provided.

  Further, according to the present embodiment, the magnetic flux generated on the stator 100 side is linked to the rotor teeth 230 on the three surfaces of the first rotor teeth 231, the second rotor teeth 232, and the third rotor teeth 233, so that torque is generated. The surface can be increased and the torque density can be improved.

  As a result, it is excellent in terms of cost and resource supply, and the torque density can be improved by increasing the torque generation surface.

  Furthermore, according to the present embodiment, among the spatial harmonic components superimposed on the magnetic flux of the fundamental frequency, the third-order harmonics are targeted for recovery, so that the harmonics generated in the stator 100 are effective for the rotor teeth 230. Thus, more field energy can be obtained.

  In addition to this, according to the present embodiment, the induction coil I and the field coil F can be supported on the inner peripheral surface of the rotor core 210, so that the induction coil I and the field coil F jump out by centrifugal force. Can be prevented, and the mechanical strength can be improved.

  Further, according to the present embodiment, the ends of the windings Iw and Fw of the induction coil I and the field coil F can be arranged on the inner peripheral surface side of the rotor 200, and the ends of the windings Iw and Fw are Since it can prevent protruding to an outer peripheral surface side, the physique of the rotary electric machine 1 can be made small.

  In the rotating electrical machine 1 of the present embodiment, the induction coil I and the field coil F are wound around the same rotor tooth 230, and the induction coil I is a field coil F in the rotor tooth 230. Rather than the stator 100 side.

  According to the present embodiment, since the induction coil I is disposed closer to the stator 100 than the field coil F, more harmonics are linked to the induction coil I and a large current is generated in the induction coil I. be able to. In addition, the induction coil I and the field coil F are wound around the same rotor teeth 230, so that the induction coil I and the field coil F can be brought into close contact with each other. The space factor can be improved.

  Further, in the rotating electrical machine 1 of the present embodiment, the rotor core 210 is divided into a first rotor core 210A on one axial side and a second rotor core 210B on the other axial side.

  According to this embodiment, the rotary electric machine 1 can be assembled by connecting the divided first rotor core 210A and second rotor core 210B so as to sandwich the stator core 110 in the axial direction. Furthermore, if the rotor core 210 is divided at an intermediate position in the axial direction, the first rotor core 210A and the second rotor core 210B can have the same shape. Therefore, all or part of the manufacturing process of the first rotor core 210A and the second rotor core 210B can be performed. Can be common.

  Further, in the rotary electric machine 1 of the present embodiment, the rotor core 210 has a cylindrical shape that covers the stator 100 on both the axial side surfaces of the stator 100 and the radial outer surface side.

  The windings of the armature coil 140, the induction coil I, and the field coil F are not limited to copper wires, and for example, aluminum conductors or high-frequency current twisted litz wires may be employed.

  Further, the rotating electrical machine 1 may be configured in a hybrid field type (hybrid type) in which a permanent magnet is disposed in the rotor 200 in addition to the field coil F. In this case, the permanent magnet and the field functioning as an electromagnet. Torque can be generated by effectively cooperating with the coil F. For this reason, the usage-amount of the rare earth magnet which raises a cost can be suppressed, and an equivalent output can be obtained, without enlarging.

  Further, the rectifying element is not limited to the diode, and other semiconductor elements such as switching elements may be employed. The rectifying element is not limited to the type housed in the diode case, and may be mounted inside the rotor 200.

  Moreover, the rotary electric machine 1 is not limited to vehicle-mounted use, For example, it can employ | adopt suitably as a generator for wind power generation, or an electric motor for machine tools.

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

DESCRIPTION OF SYMBOLS 1 Rotating electrical machine 100 Stator 110 Stator core 130 Stator teeth 140 Armature coil (coil)
200 rotor 210 rotor core 230 rotor teeth 231 first rotor teeth (rotor teeth facing the stator teeth on both sides in the axial direction of the stator core)
232 Second rotor teeth (rotor teeth facing the stator teeth on both axial sides of the stator core)
233 Third rotor teeth (rotor teeth facing the stator teeth on the outer surface side in the radial direction of the stator core)
F Field coil I Induction coil

Claims (4)

A rotating electrical machine comprising a stator that generates magnetic flux by energizing a coil and a rotor that rotates by passage of the magnetic flux,
The stator is
An annular stator core having stator teeth disposed at predetermined intervals in the circumferential direction;
An armature coil that is toroidally wound between adjacent stator teeth of the annular stator core;
The rotor is
Rotor teeth facing the stator teeth on both sides in the axial direction of the stator core;
A rotor core having a rotor tooth facing the stator teeth on the outer surface side in the radial direction of the stator core;
An induction coil wound around the rotor teeth and inducing an induced current by linkage of magnetic flux generated on the stator side;
A rotating electric machine comprising: a field coil wound around the rotor teeth and generating a magnetic field by energization of the induced current. The induction coil and the field coil are wound in layers on the same rotor teeth,
The rotating electrical machine according to claim 1, wherein the induction coil is disposed closer to the stator than the field coil.   3. The rotor core according to claim 1, wherein the rotor core is divided into a first rotor core on one side in the axial direction of the rotor core and a second rotor core on the other side in the axial direction of the rotor core. Rotating electric machine.   4. The rotating electrical machine according to claim 3, wherein the rotor core has a cylindrical shape that covers the stator on both sides in the axial direction of the stator and on an outer surface side in the radial direction.