JP2017050940A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine which improves a mechanical strength of an outer rotor with soft magnetic substances being disposed at predetermined intervals in a circumferential direction.SOLUTION: A rotary electric machine comprises: a stator including an armature coil which is electrified to generate a magnetic flux; an inner rotor which is rotated by passing the magnetic flux; and an outer rotor 200 which is rotated while being disposed in the middle of a magnetic path of the magnetic flux passing the inner rotor. In the outer rotor 200, pole piece parts 201A of soft magnetic substances and nonmagnetic members 202 are alternately disposed in the circumferential direction, and a bridge part 201B is included for connecting the neighboring pole piece parts 201A at a stator side and an inner rotor side of the nonmagnetic member 202.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a double rotor type rotating electrical machine.

  In Patent Document 1, an outer rotor arranged between an inner rotor and a stator is composed of a plurality of soft magnetic cores arranged at equal intervals in the circumferential direction, and each soft magnetic core is connected to a rotating shaft. A double rotor type rotating electrical machine fixed to a support portion is disclosed.

Japanese Patent No. 4505524

  However, in the outer rotor having a structure in which a plurality of soft magnetic cores are fixed to a support portion connected to a rotating shaft as disclosed in Patent Document 1, a space between adjacent soft magnetic cores is formed as an air region. The In the outer rotor having such a structure, since the entire soft magnetic core is not held against the support portion, there is a problem that the mechanical strength is not sufficient.

  The present invention has been made to solve the above-described problems, and provides a rotating electrical machine in which the mechanical strength of an outer rotor in which soft magnetic bodies are arranged at predetermined intervals in the circumferential direction is improved. Objective.

  In order to achieve the above object, the present invention provides a stator having an armature coil that generates a magnetic flux when energized, a first rotor that rotates by the passage of the magnetic flux, and a magnetic field of the magnetic flux that passes through the first rotor. A rotary electric machine including a second rotor that is arranged in the middle of a road and rotates, wherein the second rotor includes soft magnetic bodies and nonmagnetic bodies alternately arranged in a circumferential direction, and the nonmagnetic body It has a bridge part which connects the soft magnetic body which adjoins in the stator side and the 1st rotor side.

  ADVANTAGE OF THE INVENTION According to this invention, the rotary electric machine which improved the mechanical strength of the outer rotor by which a soft-magnetic body is arrange | positioned at predetermined intervals in the circumferential direction can be provided.

FIG. 1 is a diagram showing a rotating electrical machine according to an embodiment of the present invention, and is a cross-sectional view orthogonal to a rotation axis showing a half model of the schematic configuration. FIG. 2 is a connection diagram illustrating a closed connection circuit of a diode installed in the inner rotor. FIG. 3 is a cross-sectional view parallel to the rotation axis of the rotating electrical machine according to the embodiment of the present invention. FIG. 4 is an exploded perspective view showing the outer rotor of the rotating electrical machine according to the embodiment of the present invention. FIG. 5 is an exploded perspective view showing the inner rotor of the rotating electrical machine according to the embodiment of the present invention. FIG. 6 is an exploded perspective view showing a magnetic path member and a nonmagnetic member of the rotating electrical machine according to the embodiment of the present invention. FIG. 7 is a plan view of the magnetic path member and the nonmagnetic member of the rotating electrical machine according to the embodiment of the present invention as seen from the axial direction. FIG. 8 is an enlarged view for explaining a nonmagnetic member holding structure for a magnetic path member of a rotating electrical machine according to an embodiment of the present invention. FIG. 9 is a cross-sectional view showing each coupling portion of the magnetic path member, the outer rotating shaft, the cylindrical shaft, and the flange of the rotating electrical machine according to the embodiment of the present invention. FIG. 10 is an enlarged cross-sectional view of a portion surrounded by an alternate long and short dash line A in FIG. FIG. 11 is an enlarged cross-sectional view of a portion surrounded by an alternate long and short dash line B in FIG. FIG. 12 is a perspective view showing notched portions of the magnetic path member and the nonmagnetic member of the rotating electrical machine according to the embodiment of the present invention. FIG. 13 is a collinear diagram of the rotating electrical machine according to the embodiment of the present invention and is a diagram showing a case of high geared. FIG. 14 is a collinear diagram of the rotating electrical machine according to the embodiment of the present invention, and shows a case of low geared. FIG. 15 is a block diagram showing an outline of a control method for a rotating electrical machine according to an embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1-15 is a figure explaining the rotary electric machine which concerns on one embodiment of this invention.

  In FIG. 1, a rotating electrical machine 1 is configured as a double rotor type rotating electrical machine, and has a stator 100 formed in a cylindrical shape and a second rotor provided on the rotating shaft 1 </ b> C side from the stator 100. The outer rotor 200 and an inner rotor 300 as a first rotor provided on the rotating shaft 1C side with respect to the outer rotor 200 are provided. The outer rotor 200 and the inner rotor 300 are supported so as to be relatively rotatable about the rotation shaft 1C as a rotation center. FIG. 1 is a radial sectional view of 180 degrees (1/2) of the mechanical angle of 360 degrees.

  The stator 100 includes a stator core 101, and a plurality of stator teeth 102 extending in the radial direction toward the axis are arranged in parallel in the circumferential direction. The stator teeth 102 are formed so as to face the outer peripheral surface 201a of a magnetic path member 201 of the outer rotor 200, which will be described later, with the inner peripheral surface 102a facing the air gap G1.

  In this stator 100, armature coils 104 corresponding to the W-phase, V-phase, and U-phase of three-phase alternating current are housed with the slot 103 between the side surfaces 102b of the stator teeth 102. The armature coil 104 is wound around the stator teeth 102 by distributed winding. The armature coil 104 generates a magnetic flux when energized.

  When the three-phase alternating current is supplied to the armature coil 104, the stator 100 generates a rotating magnetic field that rotates in the circumferential direction, and links the generated magnetic flux to the outer rotor 200 and the inner rotor 300, thereby the outer rotor 200 and Each of the inner rotors 300 is driven to rotate.

  The outer rotor 200 includes a magnetic path member 201 made of a soft magnetic material such as steel having a high magnetic permeability, and a nonmagnetic member 202 made of a nonmagnetic material that does not pass magnetic flux such as PPS (polyphenylene sulfide) resin. The magnetic path member 201 and the nonmagnetic member 202 are extended in the axial direction. The axial direction indicates the same direction as the direction in which the rotating shaft 1C extends.

  The magnetic path member 201 has a pole piece portion 201A that faces the nonmagnetic member 202 in the circumferential direction, and a bridge portion 201B that connects adjacent pole piece portions 201A on the stator side and the inner rotor side of the nonmagnetic member 202.

  The pole piece portion 201A and the bridge portion 201B are integrally formed. Therefore, the magnetic path member 201 is configured as an integral core in which the pole piece portion 201A and the bridge portion 201B are integrally formed. The magnetic path member 201 configured as an integral core is formed by laminating a plurality of electromagnetic steel plates in the axial direction.

  The nonmagnetic member 202 is provided in a space surrounded by the pole piece portion 201A and the bridge portion 201B. Therefore, in the outer rotor 200 of the present embodiment, the soft magnetic pole piece portions 201A and the nonmagnetic members 202 are alternately arranged in the circumferential direction. Detailed configurations of the magnetic path member 201 and the nonmagnetic member 202 will be described later.

  In the outer rotor 200, the outer peripheral surface 201a and the inner peripheral surface 201b of the magnetic path member 201 face the inner peripheral surface 102a of the stator teeth 102 of the stator 100 and the outer peripheral surface 302a of the rotor teeth 302 of the inner rotor 300 described later. It is formed as follows.

  In the outer rotor 200, the magnetic flux generated by the armature coil 104 of the stator 100 passes through the pole piece portion 201 </ b> A of the magnetic path member 201 efficiently, while the nonmagnetic member 202 prevents the magnetic flux from passing therethrough. After passing through the pole piece portion 201A of the outer rotor 200, the magnetic flux generated by the armature coil 104 of the stator 100 is interlinked with the outer peripheral surface 302a of the rotor teeth 302 of the inner rotor 300, as will be described later. A magnetic circuit returning to the stator 100 is formed by passing through the pole piece portion 201 </ b> A of the outer rotor 200.

  At this time, since the outer rotor 200 rotates relative to the stator 100, the pole piece portion 201A of the magnetic path member 201 that passes the magnetic flux and the nonmagnetic member 202 that restricts the passage of the magnetic flux are repeatedly switched to change the magnetic circuit. Form.

  As the outer rotor 200 rotates in this manner, the number and frequency of the rotating magnetic field generated by the armature coil 104 can be changed. Torque is generated by the synchronous rotation of the modulated rotating magnetic field and the inner rotor 300.

  The inner rotor 300 includes a rotor core 301 in which a plurality of electromagnetic steel plates are laminated in the axial direction. In the rotor core 301, a plurality of rotor teeth (saliency pole portions) 302 extending in the radial direction separated from the shaft center are arranged in parallel in the circumferential direction. The rotor teeth 302 are formed so that the outer peripheral surface 302a faces the inner peripheral surface 201b of the magnetic path member 201 of the outer rotor 200 via the air gap G2.

  The rotor teeth 302 have a rotor winding 330 composed of an induction coil I and a field coil F. The induction coil I is wound around the outer rotor 200 side of the rotor teeth 302 with a slot 303 between the side surfaces 302b of the adjacent rotor teeth 302. The field coil F is wound around the axial center of the rotor teeth 302 with a slot 303 between the side surfaces 302b of the adjacent rotor teeth 302. That is, the induction coil I is wound on the radially outer side of the inner rotor 300 in the slot 303, and the field coil F is wound on the radially inner side of the inner rotor 300 in the slot 303.

  The induction coil I is formed in a concentrated winding in which each adjacent rotor coil 302 forms a circumferential winding whose direction is opposite to each other in the circumferential direction of the inner rotor 300, and is arranged in the circumferential direction of the inner rotor 300. The induction coil I generates (induces) an induced current by interlinking of magnetic flux.

The field coils F are formed so as to be concentrated windings in which the adjacent windings are opposite to each other in the circumferential direction of the inner rotor 300 for each rotor tooth 302, and are arranged in the circumferential direction of the inner rotor 300. The field coil F is excited by being supplied with a field current and functions as an electromagnet.
Thus, the induction coil I and the field coil F are wound so that the current directions are equal.

  Here, the eight induction coils I corresponding to the mechanical angle of 180 degrees in FIG. 1 are distinguished from each other by calling them induction coils I1 to I8 in the rotation direction (counterclockwise direction). In addition, eight field coils F corresponding to a mechanical angle of 180 degrees are distinguished from each other by being called field coils F1 to F8 in the rotation direction.

  In FIG. 2, induction coils I1, I3, I5, I7 and field coils F1, F2, F3, F4 together with diodes D1, D2 form a rectifier circuit C1, which is a closed circuit. In this rectifier circuit C1, every third induction coil I1, I5 and diode D1 are connected in series, every third induction coil I3, I7 and diode D2 are connected in series, and field coils F1, F2, F3, F4. Are connected in series. In addition, the series connection consisting of induction coils I1 and I5 and diode D1 and the series connection consisting of induction coils I3 and I7 and diode D2 are connected in parallel at both ends, and then the field coil on the cathode side of diodes D1 and D2. It is connected to a series connection composed of F1, F2, F3, and F4. In this way, the rectifier circuit C1 rectifies the alternating induction current generated in the induction coils I1, I3, I5, and I7 in one direction by the diodes D1 and D2, respectively, and directs the current to the field coils F1, F2, F3, and F4. The circuit configuration is wired so as to supply the field current.

  The induction coils I2, I4, I6, and I8 and the field coils F5, F6, F7, and F8 together with the diodes D3 and D4 form a rectifier circuit C2 that is a closed circuit. In this rectifier circuit C2, every third induction coil I2, I6 and diode D3 are connected in series, every third induction coil I4, I8 and diode D4 are connected in series, and field coils F5, F6, F7, F8. Are connected in series. In addition, the series connection including the induction coils I2, I6 and the diode D3 and the series connection including the induction coils I4, I8 and the diode D4 are connected in parallel at both ends, and then the field coil F5 on the cathode side of the diodes D3 and D4. , F6, F7, F8 are connected in series. As described above, the rectifier circuit C2 rectifies the AC induced current generated in the induction coils I2, I4, I6, and I8 in one direction by the diodes D3 and D4, respectively, and directs the current to the field coils F5, F6, F7, and F8. The circuit configuration is wired so as to supply the field current.

  With this circuit configuration, the induction current generated by the induction coil I can be rectified and the field coil F can be excited as a field current, so that the rotor teeth 302 can function as an electromagnet.

  Here, even when the induction coils I and the field coils F are multipolarized, the number of diodes D1, D2, D3, and D4 is reduced by using a series connection, and in order to avoid mass use, Rather than forming an H-bridge type full-wave rectifier circuit, the neutral-point-clamped half-wave rectifier outputs a half-wave rectified output by inverting one of the induction currents so that each phase is 180 degrees. A circuit is formed.

  In the field coils F of the rectifier circuits C1 and C2, the winding directions of the adjacent rotor teeth 302 are reversed. Accordingly, one rotor tooth 302 of the inner rotor 300 that constitutes a part of the magnetic circuit is magnetized so as to function as an electromagnet that faces the south pole that is directed from the pole piece portion 201A of the outer rotor 200. . Further, another adjacent rotor tooth 302 is magnetized so as to function as an electromagnet that faces the N pole in a direction in which magnetic flux is guided to the outer rotor 200 side.

  Here, the principle of torque generation of the rotating electrical machine 1 will be described. In the inner rotor 300, among the magnetic fluxes linked from the stator 100 via the outer rotor 200, the magnetic flux modulated by the rotation of the outer rotor 200 is linked in synchronization with the rotation of the inner rotor 300.

  On the other hand, in the rotating electrical machine 1, the magnetic flux interlinked with the induction coil I of the inner rotor 300 includes a component that varies without being modulated by the outer rotor 200 (not synchronized with the rotation of the inner rotor 300). As a result, an alternating induction current can be generated in the induction coil I. Then, the AC induced current is rectified by the diodes D1 and D2 to be a DC field current, and the field coil F is energized to cause the rotor teeth 302 to function as an electromagnet to generate a field magnetic flux. it can. In this way, the rotating electrical machine 1 can generate torque.

  At this time, the magnetic flux interlinking from the stator teeth 102 of the stator 100 to the rotor teeth 302 of the inner rotor 300 through the pole piece portion 201A of the outer rotor 200 is supplied from the AC power source to the distributed armature coil 104. generate.

  By the way, this armature coil 104 employs distributed winding in the present embodiment, but may employ concentrated winding. When concentrated winding is employed, more harmonic components can be superimposed on the magnetic flux interlinking with the rotor teeth 302 than when generated by a distributed winding coil. Since the harmonic component superimposed on the magnetic flux acts as a fluctuation in the amount of magnetic flux, an induction current can be effectively generated in the induction coil I, and a larger field current is supplied to the field coil F. Field magnetic flux can be generated.

  For these reasons, the rotating electrical machine 1 can relatively rotate the inner rotor 300 with electromagnet torque (rotational force) without providing a permanent magnet. In the inner rotor 300, the rotor teeth 302 function as electromagnets arranged in parallel so that the magnetization directions (N pole and S pole) are alternated in the circumferential direction, whereby a chain is formed between the outer rotor 200 and the stator 100. The magnetic flux to be exchanged can be passed around the slot 303 smoothly.

  In this rotating electrical machine 1, the outer rotor 200 rotates relative to the stator 100, and the inner rotor 300 to which the magnetic flux passing through the rotating outer rotor 200 (magnetic path member 201) is linked is rotated relative to the electromagnet torque. Therefore, the outer rotor 200 can be rotated at a low speed, and the inner rotor 300 can be rotated at a high speed. Conversely, the outer rotor 200 can be rotated at a high speed and the inner rotor 300 can be rotated at a low speed.

The rotating electrical machine 1 is configured to generate a torque necessary for the above-described rotational drive in accordance with the structure of the stator 100, the outer rotor 200, and the inner rotor 300. Specifically, the number of pole pairs of the armature coil 104 of the stator 100 is A, the number of pole piece parts 201A that is the number of poles of the outer rotor 200 is H, and the rotor teeth (electromagnet) 302 that is the number of pole pairs of the inner rotor 300 is When the number of pole pairs is P, the following formula (1) is established.
H = | A ± P | (1)

  With this structure, it is possible to effectively generate torque and to efficiently rotate the outer rotor 200 and the inner rotor 300 relative to the stator 100. For example, in the rotating electrical machine 1 of the present embodiment, the number of pole pairs A = 4 of the armature coil 104 of the stator 100, the number of poles H = 12 of the outer rotor 200, and the number of pole pairs P = 8 of the rotor teeth 302 of the inner rotor 300. Yes, the above equation (1) is satisfied.

  As shown in FIG. 3, in the rotating electrical machine 1, an outer rotor 200 is rotatably accommodated in a stator 100, and an inner rotor 300 is rotatably accommodated in the outer rotor 200.

  Further, an outer rotating shaft 210 is coupled to the magnetic path member 201 of the outer rotor 200 so as to be integrally rotatable. An inner rotary shaft 310 is coupled to the rotor core 301 of the inner rotor 300 so as to be integrally rotatable. Thereby, the rotary electric machine 1 is configured as a magnetic modulation type biaxial motor capable of transmitting power to each of the outer rotary shaft 210 and the inner rotary shaft 310 using the magnetic modulation principle.

  Therefore, the rotating electrical machine 1 can function, for example, the stator 100 as a sun gear of a planetary gear mechanism, the outer rotor 200 as a carrier of a planetary gear mechanism, and the inner rotor 300 as a ring gear of the planetary gear mechanism, and is equivalent to a mechanical planetary gear mechanism. A function can be provided. The rotating electrical machine 1 according to the present embodiment is configured such that the outer rotor 200 functions as a carrier.

  With this structure, for example, when the rotating electrical machine 1 is mounted as a drive source together with an engine (internal combustion engine) in a hybrid vehicle, the outer rotating shaft 210 of the outer rotor 200 and the inner rotating shaft 310 of the inner rotor 300 are respectively connected to the power transmission path of the vehicle. By connecting directly to the armature coil 104 of the stator 100 via an inverter, it is possible to function as a power transmission mechanism together with the drive source.

(Outer rotor)
3 and 4, the outer rotor 200 includes an outer rotating shaft 210 made of iron, an annular flange 215, and a cylindrical cylindrical shaft 214 in addition to the magnetic path member 201 and the nonmagnetic member 202 described above. I have.

  The outer rotating shaft 210 includes a cylindrical small-diameter portion 210A and a flange-shaped large-diameter portion 210B continuous with the other end of the small-diameter portion 210A. The large-diameter portion 210B is formed such that the radial direction around the rotation shaft 1C is larger than the radial direction of the small-diameter portion 210A, and faces the magnetic path member 201 on the other end side in the axial direction.

  A resolver ring 221, a resolver rotor 220, and a retainer 218 are provided in the small diameter portion 210 </ b> A of the outer rotating shaft 210 from one end portion in the axial direction toward the other end portion. The resolver rotor 220 is fixed to the small diameter portion 210 </ b> A by a resolver ring 221 so as to be integrally rotatable. The retainer 218 is formed in an annular shape, and supports an outer ring of a radial ball bearing 21 to be described later on a side surface on one end side in the axial direction of an inner edge portion thereof. Further, the retainer 218 is provided with a nut portion 218A, and a bolt 26 described later is screwed into the nut portion 218A.

  The flange 215 is provided between the large diameter portion 210 </ b> B of the outer rotating shaft 210 and the magnetic path member 201 and the nonmagnetic member 202. The flange 215 is made of a nonmagnetic material such as an aluminum material. As a result, the magnetic flux generated by the armature coil 104 is prevented from flowing as a leakage magnetic flux to the outer rotary shaft 210 made of iron.

  A plurality of insertion holes 210B1 and 215A arranged in the circumferential direction are respectively formed in the large diameter portion 210B and the flange 215, and a non-magnetic bolt 219 is inserted through these insertion holes 210B1 and 215A. An insertion hole 202A is formed in the nonmagnetic member 202, and a nonmagnetic bolt 219 is inserted into the insertion hole 202A.

  The nonmagnetic bolt 219 is made of a nonmagnetic material that does not pass magnetic flux, such as PPS (polyphenylene sulfide) resin. For this reason, in the outer rotor 200, each pole piece portion 201A (see FIG. 1) is magnetically independent, and the permeance variation (saliency pole) by each pole piece portion 201A is compared with the case where the non-magnetic bolt 219 is made of a magnetic material. Ratio) can be increased. Thereby, the torque density in the rotary electric machine 1 is improved.

  Further, since the nonmagnetic bolt 219 is made of a nonmagnetic material, eddy current generated in the nonmagnetic bolt 219 due to the harmonic magnetic flux generated in the gap and generated between the nonmagnetic bolts 219. Loss due to eddy currents can be reduced.

  The cylindrical shaft 214 is provided on the other end side in the axial direction of the magnetic path member 201 and the nonmagnetic member 202 (left end side in FIG. 3). The cylindrical shaft 214 includes an axis of the nonmagnetic bolt 219. A female screw 214A is formed to which the other end in the direction is screwed.

  The cylindrical shaft 214 is made of, for example, nonmagnetic stainless steel. As a result, the magnetic flux generated by the armature coil 104 is prevented from flowing to the outside as a leakage magnetic flux via the cylindrical shaft 214.

  In the outer rotor 200, the nonmagnetic bolt 219 is sequentially inserted from the other end side in the axial direction into the insertion hole 210 </ b> B <b> 1 of the large diameter portion 210 </ b> B, the insertion hole 215 </ b> A of the flange 215, and the insertion hole 202 </ b> A of the nonmagnetic member 202. The flange 215 and the outer rotary shaft 210 are fixed to one end side in the axial direction of the magnetic path member 201 and the nonmagnetic member 202 (right end side in FIG. 3), and the magnetic path A cylindrical shaft 214 is fixed to the other end side in the axial direction of the member 201 and the nonmagnetic member 202.

(Inner rotor)
3 and 5, the inner rotor 300 includes an inner rotating shaft 310 made of iron. On the outer periphery of the inner rotary shaft 310, the balance plate 311, the spacer 312, the rotor winding 330, the spacer 314, the diode holder 315, the balance plate 316, U are arranged from one end to the other end in the axial direction. A nut 317, a retainer 318, a resolver rotor 319, and a resolver ring 320 are provided.

  The balance plate 311 is made of an iron material formed in an annular shape, and is positioned in the axial direction by the flange portion of the inner rotary shaft 310 at the inner peripheral edge portion. The balance plate 311 supports the rotor winding 330 via a spacer 312 from one end side (right end side in FIG. 3) of the rotor winding 330 in the axial direction.

  The spacer 312 is interposed between the axial end of the rotor winding 330 and the balance plate 311. The spacer 312 is formed such that the radial direction around the rotating shaft 1 </ b> C is smaller than the radial direction of the rotor winding 330, and a space is formed between the rotor winding 330 and the balance plate 311. The spacer 312 is made of an aluminum material formed in an annular shape. The balance plate 311 and the spacer 312 are prevented from rotating with respect to the inner rotary shaft 310 so as to rotate integrally with the rotor winding 330.

  The balance plate 316 is made of an iron material formed in an annular shape, and is positioned in the axial direction by a U nut 317 at the inner peripheral edge. The balance plate 316 supports the rotor winding 330 via the diode holder 315 and the spacer 314 from the other end side in the axial direction of the rotor winding 330 (left end side in FIG. 3).

  The spacer 314 is interposed between the other end portion in the axial direction of the rotor winding 330 and the diode holder 315. The spacer 314 has a smaller radial dimension around the rotation axis 1 </ b> C than the rotor winding 330, and forms a space between the rotor winding 330 and the diode holder 315. The spacer 314 is made of an aluminum material formed in an annular shape.

  The diode holder 315 is made of a circuit board formed in an annular shape, and holds the aforementioned diodes D1 to D4. The balance plate 316, the diode holder 315, and the spacer 314 are prevented from rotating with respect to the inner rotary shaft 310 so as to rotate integrally with the rotor winding 330.

  The U nut 317 has a female screw (not shown) formed on the inner peripheral surface thereof, and is screwed to a male screw (not shown) formed on the outer peripheral surface of the inner rotary shaft 310. When the U nut 317 is screwed to the inner rotating shaft 310, the rotor winding 330 is sandwiched from both sides in the axial direction by the balance plates 311 and 316 via the spacers 312 and 314 and the diode holder 315. The rotation axis 310 is fixed in the axial direction and the rotation direction.

  The retainer 318 is formed in an annular shape, and supports an outer ring of a radial ball bearing 23 described later on the side surface of the inner edge portion on the other end side in the axial direction (left end side in FIG. 3). A nut portion 318A is provided on one end side (right end side in FIG. 3) of the outer edge portion of the retainer 318 in the axial direction, and a bolt 25 described later is screwed into the nut portion 318A. .

(Overall structure including case)
In FIG. 3, the rotating electrical machine 1 includes a case 10 in which the above-described stator 100, outer rotor 200, and inner rotor 300 are accommodated.

  The case 10 includes a first flange 11, a first spacer 12, a first case 13, a second case 14, a second spacer 15, and a second flange 16 from one end side in the axial direction toward the other end side. ing.

  The first case 13 includes a disc-shaped plate portion 13A and a cylindrical cylindrical portion 13B continuous to the other end side of the outer edge portion of the plate portion 13A. A through hole 13C is formed at the center of the plate portion 13A, and a small diameter portion 210A of the outer rotating shaft 210 passes through the through hole 13C.

  A stator 100 is fixed to the inner peripheral surface of the cylindrical portion 13B. The cylindrical portion 13 </ b> B faces the magnetic path member 201 and the nonmagnetic member 202 of the outer rotor 200 and the rotor core 301 and the rotor winding 330 of the inner rotor 300 in the radial direction.

  Thus, on the radially inner side of the cylindrical portion 13B, the stator 100 that is the main portion of the rotating electrical machine 1, the magnetic path member 201 and the nonmagnetic member 202 of the outer rotor 200, the rotor core 301 of the inner rotor 300, and the rotor windings. 330 is accommodated.

  A radial ball bearing 21 is provided in the through hole 13C. The radial ball bearing 21 is positioned in the axial direction by inserting a bolt 26 into the plate portion 13A of the first case 13 from one end in the axial direction and screwing it into the nut portion 218A of the retainer 218. The plate portion 13 </ b> A of the first case 13 supports the small-diameter portion 210 </ b> A of the outer rotating shaft 210 via the radial ball bearing 21 so as to be rotatable.

  A resolver sensor 31 is fixed in the through hole 13C. On the other hand, an annular resolver rotor 220 is provided on the small diameter portion 210 </ b> A of the outer rotating shaft 210 so as to face the resolver sensor 31 in the radial direction. The resolver rotor 220 is fixed to the small-diameter portion 210 </ b> A of the outer rotating shaft 210 by a resolver ring 221 so as to be integrally rotatable.

  The resolver sensor 31 detects the rotation angle of the outer rotor 200 by detecting the rotation angle of the resolver rotor 220.

  The second case 14 includes a cylindrical outer cylinder portion 14A, a cylindrical inner cylinder portion 14B disposed on the inner peripheral side of the outer cylinder portion 14A, and the axial direction of the outer cylinder portion 14A and the inner cylinder portion 14B. It has a disc-shaped plate portion 14C continuous on the other end side.

  The first case 13 and the second case 14 are formed by attaching the cylindrical portion 13B of the first case 13 and the outer cylindrical portion 14A of the second case 14 together in the axial direction and fastening them with bolts (not shown). 200 and the inner rotor 300 are connected.

  The outer cylinder portion 14 </ b> A is opposed to the other end portion in the axial direction of the cylindrical shaft 214 of the outer rotor 200 in the radial direction, and supports the cylindrical shaft 214 rotatably via the radial ball bearing 22.

  Here, the outer rotor 200 of the present embodiment has a cup-type structure in which the magnetic path member 201 and the nonmagnetic member 202 are fixed to the large diameter portion 210B of the outer rotating shaft 210 on one end side in the axial direction. .

  When the cup-shaped outer rotor 200 is cantilevered with respect to the first case 13, for example, when natural vibration occurs, the electromagnetic attraction acting on the outer rotor 200 and the natural vibration of the outer rotor 200 resonate. When an excessive force is applied, electromagnetic vibration becomes large. In addition, when the outer rotor 200 is driven eccentrically, an excessive load is applied to the radial ball bearing that is cantilevered, which affects the durability of the radial ball bearing.

  Therefore, in the present embodiment, the other end side in the axial direction of the outer rotor 200, that is, the cylindrical shaft 214 is positioned in the radial direction around the rotation shaft 1 </ b> C rather than the radial ball bearing 21 supporting the outer rotation shaft 210. It was set as the structure supported with respect to the 2nd case 14 by the radial ball bearing 22 with a big dimension.

  As a result, the outer rotor 200 of the present embodiment can have a both-end support structure, which prevents an increase in electromagnetic vibration as described above and an excessive load on the radial ball bearing 21 due to the eccentric drive. can do.

  A resolver sensor 32 is fixed to the inner periphery of the inner cylinder portion 14B. On the other hand, the inner rotary shaft 310 is provided with an annular resolver rotor 319 so as to face the resolver sensor 32 in the radial direction. The resolver rotor 319 is fixed to the inner rotation shaft 310 by a resolver ring 320 so as to be integrally rotatable.

  The resolver sensor 32 detects the rotation angle of the inner rotor 300 by detecting the rotation angle of the resolver rotor 319.

  A radial ball bearing 23 is provided on the inner circumference of one end portion in the axial direction of the inner cylinder portion 14B. The radial ball bearing 23 is positioned in the axial direction by inserting a bolt 25 from the other end in the axial direction into the inner cylinder portion 14B and screwing it into the nut portion 318A of the retainer 318. The inner cylindrical portion 14 </ b> B of the second case 14 rotatably supports the inner rotary shaft 310 via the radial ball bearing 23.

  A radial ball bearing 24 is provided on the inner periphery of the large-diameter portion 210B of the outer rotating shaft 210. The large-diameter portion 210B rotatably supports one end portion of the inner rotary shaft 310 via the radial ball bearing 24.

  A through hole 12A is formed in the first spacer 12, and a wiring 31A extending from the resolver sensor 31 passes through the through hole 12A. Further, the first spacer 12 is interposed between the first case 13 and the first flange 11, thereby ensuring a space through which the wiring 31 </ b> A passes between the first case 13 and the first flange 11. ing.

  A through-hole 15A is formed in the second spacer 15, and a wiring 32A extending from the resolver sensor 32 passes through the through-hole 15A. Further, the second spacer 15 is interposed between the second case 14 and the second flange 16, so that a space through which the wiring 32 </ b> A passes is secured between the second case 14 and the second flange 16. ing.

  The first flange 11 is fixed to one end of the first case 13 in the axial direction by a bolt (not shown) via a cylindrical first spacer 12. The first flange 11 is formed in a flange shape having a larger radial dimension around the rotation shaft 1C than the first case 13, and is fixed to the vehicle body by a bolt (not shown).

  On the inner peripheral side of the first flange 11, a coupling 33 is provided at one end portion in the axial direction of the small diameter portion 210 </ b> A of the outer rotating shaft 210. For example, a vehicle drive shaft (not shown) is coupled to the small diameter portion 210 </ b> A of the outer rotating shaft 210 via a coupling 33. The rotation of the outer rotating shaft 210 is transmitted to the drive shaft of the vehicle through this coupling 33.

  On the other end side in the axial direction of the second case 14, a second flange 16 is fixed by a bolt (not shown) via a cylindrical second spacer 15. The second flange 16 is formed in a flange shape having a larger radial dimension around the rotation shaft 1C than the second case 14, and is fixed to the vehicle body by a bolt (not shown).

On the inner peripheral side of the second flange 16, a coupling 34 is provided at the other end of the inner rotor 300 in the axial direction of the inner rotating shaft 310. The engine output shaft is not connected. Engine rotation is transmitted to the inner rotating shaft 310 via the coupling 34.
In the rotating electrical machine 1 of the present embodiment, a vehicle drive shaft is connected to the outer rotating shaft 210, and an engine output shaft is connected to the inner rotating shaft 310, but as a rotating electrical machine of other embodiments, An engine output shaft may be connected to the outer rotating shaft 210, and a vehicle driving shaft may be connected to the inner rotating shaft 310.

(Magnetic path member and non-magnetic member)
Next, detailed configurations of the magnetic path member 201 and the nonmagnetic member 202 will be described with reference to FIGS.

  As shown in FIG. 6, the nonmagnetic members 202 are press-fitted from the axial direction into the insertion port 201 </ b> C, which is a space surrounded by the pole piece part 201 </ b> A and the bridge part 201 </ b> B, using a not-shown press-fitting jig. It has become.

  Thereby, as shown in FIG. 7, the magnetic path member 201 and the nonmagnetic member 202 are integrated in a state where the pole piece portions 201A and the nonmagnetic member 202 are alternately arranged in the circumferential direction. The integrated magnetic path member 201 and nonmagnetic member 202 are attached to the outer rotating shaft 210 via a flange 215 (see FIG. 4).

  As shown in FIG. 8, the bridge portion 201B of the magnetic path member 201 is formed on the radially inner side and the radially outer side of the magnetic path member 201 so as to connect the pole piece portions 201A adjacent in the circumferential direction.

  Here, when the radial width W of the bridge portion 201B is large, a leakage magnetic flux is generated in the bridge portion 201B, and the salient pole ratio in the outer rotor 200 is reduced. Such a decrease in the salient pole ratio causes the torque of the rotating electrical machine 1 to be generated.

  Therefore, the width W in the radial direction of the bridge portion 201B is preferably as small as possible. However, if the width W in the radial direction of the bridge portion 201B is too small, there is a risk that the electromagnetic steel sheet is distorted during the punching process for forming the insertion slot 201C in each electromagnetic steel sheet.

  Therefore, in the present embodiment, the radial width W of the bridge portion 201B is set to a width that can suppress a decrease in the salient pole ratio and can ensure rigidity that does not cause distortion during punching.

  Specifically, the radial width W of the bridge portion 201B is at least larger than the thickness of one electromagnetic steel plate constituting the magnetic path member 201, and preferably 1.5 mm of the thickness of one electromagnetic steel plate. The size is set to double to double.

  Thereby, in the bridge part 201B, the magnetic flux density is immediately increased and the magnetic saturation is easily performed. As a result, the magnetic permeability of the bridge portion 201B is reduced, so that a reduction in the salient pole ratio in the outer rotor 200 can be suppressed.

  Moreover, it can suppress that a distortion | strain generate | occur | produces in an electromagnetic steel plate at the time of the punching process for forming the insertion opening 201C in each electromagnetic steel plate. As a result, the yield of the magnetic path member 201 does not decrease, and the decrease in productivity due to distortion during punching can be suppressed.

  The nonmagnetic member 202 is held by a clearance fit with respect to each bridge portion 201 </ b> B formed on the radially inner side and the radially outer side of the magnetic path member 201. That is, the nonmagnetic member 202 is held with respect to each bridge portion 201B in a state where a predetermined gap is secured between the nonmagnetic member 202 and each bridge portion 201B.

  Thus, when the nonmagnetic member 202 is press-fitted into the insertion port 201C, an excessive load is prevented from being applied to the bridge portion 201B having a small radial width W. For this reason, it is possible to prevent the bridge portion 201B from being deformed when the nonmagnetic member 202 is press-fitted into the insertion port 201C.

  Further, the nonmagnetic member 202 is held with an interference fit with respect to the pole piece portion 201A adjacent in the circumferential direction. That is, the nonmagnetic member 202 is held in a state of surface contact over the axial direction with respect to the pole piece portion 201A adjacent in the circumferential direction.

  Thereby, when the outer rotor 200 rotates in the circumferential direction, the torque acting on the pole piece portion 201A can be received at the interference fit portion. Further, since the nonmagnetic member 202 is in surface contact with the pole piece portion 201A in the axial direction at the interference fit portion, when the torque is applied to the pole piece portion 201A, the nonmagnetic member 202 makes contact with the pole piece. A reaction acts on the portion 201A. Thereby, it can prevent that pole piece part 201A twists with respect to an axial center. Therefore, the outer rotor 200 can transmit the torque from the magnetic path member 201 and the nonmagnetic member 202 to the outer rotating shaft 210 without generating the twist of the pole piece portion 201A.

(Bonded structure)
Next, referring to FIGS. 9 to 12, a coupling structure between the magnetic path member 201 and the cylindrical shaft 214, a coupling structure between the magnetic path member 201 and the flange 215, and a coupling structure between the flange 215 and the outer rotating shaft 210. Will be described.

  In the present embodiment, in order to ensure the concentricity of the magnetic path member 201, the outer rotating shaft 210, the cylindrical shaft 214, and the flange 215, the magnetic path member 201 and the cylinder are joined at a joint portion surrounded by a dashed line A in FIG. The shaft 214 is in-row coupled, and the magnetic path member 201 and the flange 215 are in-row coupled at the coupling portion surrounded by the one-dot chain line B in FIG. 9, and the flange 215 and the outer rotating shaft 210 are in-row coupled.

  Specifically, as shown in FIG. 10, an inner edge portion on one end side in the axial direction of the cylindrical shaft 214 (an end portion side facing the outer rotor 200 in the axial direction) has a rotational axis from the outer diameter of the cylindrical shaft 214. A small-diameter portion 214a having a small radial dimension around 1C (see FIG. 3) is formed over the entire circumferential direction.

  On the other hand, at the inner edge of the magnetic path member 201 on the other end side in the axial direction (end side facing the cylindrical shaft 214 in the axial direction), a notch 200a that fits into the small diameter portion 214a of the cylindrical shaft 214 is formed. It is formed over the entire region in the circumferential direction. The notch 200a is also formed at the inner edge of one end of the magnetic path member 201 in the axial direction (the end facing the flange 215 in the axial direction).

  FIG. 12 is a perspective view showing a notch 200 a formed on the other end side in the axial direction of the magnetic path member 201. As shown in FIG. 12, the notch portion 200 a formed on the other end side in the axial direction of the magnetic path member 201 is formed on the inner edge portion of the other end portion in the axial direction of each nonmagnetic member 202. 202B and the notch 201D formed in the inner edge part of the other end part of the pole piece part 201A in the axial direction.

  In addition, with respect to the notch portion 200a formed on one end side in the axial direction of the magnetic path member 201, the notch 202B formed on the inner edge portion of one end portion in the axial direction of each nonmagnetic member 202, and the pole piece portion It is comprised by 201 A of notches formed in the inner edge part of the one end part of the axial direction of 201A.

  The notch 201D sets the inner diameters of a plurality of electromagnetic steel sheets on the other end side in the axial direction and one end side in the axial direction among the electromagnetic steel sheets stacked in the axial direction to be larger than the inner diameters of the other electromagnetic steel sheets. By that, it is formed.

  The magnetic path member 201 and the cylindrical shaft 214 are in-row coupled by fitting a notch portion 200a formed on the other end side in the axial direction of the magnetic path member 201 and a small diameter portion 214a.

  Further, as shown in FIG. 11, the inner edge of the flange 215 on the other end side in the axial direction (the end side facing the magnetic path member 201 in the axial direction) is connected to the rotating shaft 1C (from the outer diameter of the flange 215). A small-diameter portion 215B having a small radial dimension centering on (see FIG. 3) is formed over the entire circumferential direction. The small-diameter portion 215B of the flange 215 is adapted to fit into a notch 200a formed on the inner edge of the magnetic path member 201 on one end side in the axial direction.

  The magnetic path member 201 and the flange 215 are in-row coupled by fitting a notch portion 200a formed on one end side in the axial direction of the magnetic path member 201 and the small diameter portion 215B.

  Further, the inner edge of one end of the flange 215 in the axial direction (the end facing the large-diameter portion 210B of the outer rotating shaft 210 in the axial direction) has a rotating shaft 1C (see FIG. 3) from the outer diameter of the flange 215. ), And a small diameter portion 215C having a small radial dimension is formed over the entire circumferential direction.

  On the other hand, a notch that fits into the small-diameter portion 215C of the flange 215 is formed at the inner edge portion on the other end side in the axial direction of the large-diameter portion 210B of the outer rotating shaft 210 (the end portion side facing the flange 215 in the axial direction). The portion 210C is formed over the entire circumferential direction.

  The flange 215 and the outer rotating shaft 210 are in-row coupled by fitting the small-diameter portion 215C and the notch portion 210C described above.

  In this way, since the magnetic path member 201, the outer rotary shaft 210, the cylindrical shaft 214, and the flange 215 are coupled in-lay, the magnetic path member 201, the outer rotary shaft 210, the cylindrical shaft 214, and the flange 215 are coupled to each other. When concentrating, it is easy to ensure concentricity. Thereby, the eccentric drive of the outer rotor 200 is prevented.

  Further, when the magnetic path member 201, the outer rotary shaft 210, the cylindrical shaft 214, and the flange 215 are coupled to each other, the concentricity can be easily secured by using the spigot coupling, and therefore, the nonmagnetic bolt 219 (FIG. 4). Fastening) by reference) is facilitated, and assemblability is improved.

  In addition, the magnetic path member 201, the outer rotating shaft 210, the cylindrical shaft 214, and the flange 215 that are in-row coupled as described above are non-magnetic bolts 219 in a state where the coaxiality is secured using a coaxial jig (not shown). (See FIG. 4).

(Control method)
Next, with reference to FIG. 13 to FIG. 15, a control method for the rotating electrical machine 1 of the present embodiment will be described. In the following, as shown in FIG. 15, a case where a vehicle drive shaft 403 is connected to the outer rotor 200 and an engine 401 is connected to the inner rotor 300 will be described as an example. These connection relationships may be reversed.

The rotating electrical machine 1 according to the present embodiment includes resolver sensors 31 and 32. The rotational speed (outer rotor angular speed) ω _m of the outer rotor 200 can be detected by the resolver sensor 31. Further, the rotational speed (inner rotor angular speed) ω _pm of the inner rotor 300 can be detected by the resolver sensor 32.

Therefore, in the rotating electrical machine 1 of the present embodiment, the speed of the rotating magnetic field generated in the stator 100 based on the outer rotor angular velocity ω _m detected by the resolver sensors 31 and 32, the inner rotor angular velocity ω _pm , and the following equation (2). It is possible to control the (rotational magnetic field angular velocity) ω _s .
P _m ω _m −P _pm ω _pm = P _s ω _s (2)
In the above equation (2), P _m is the number of poles of the outer rotor 200, P _pm is the number of pole pairs of the inner rotor 300, and P _s is the number of pole pairs of the stator 100.

  According to the above formula (2), the stator 100, the outer rotor 200, and the inner rotor 300 can be driven based on the collinear relationship. 13 and 14 are collinear diagrams showing the collinear relationship of the stator 100, the outer rotor 200, and the inner rotor 300. FIG.

In the collinear charts shown in FIG. 13 and FIG. 14, when any two angular velocities are determined among the stator rotating magnetic field angular velocity ω _s , the outer rotor angular velocity ω _m , and the inner rotor angular velocity ω _pm , the remaining angular velocities are determined. . FIG. 13 shows a high geared case where the rotational speed of the drive shaft is higher than the rotational speed of the engine. FIG. 14 shows a case of low geared where the rotational speed of the drive shaft is lower than the rotational speed of the engine.

In the rotating electrical machine 1 having such a collinear relationship, the ratio of the rotational speed of the drive shaft to the rotational speed of the engine can be steplessly changed according to the speed of the vehicle. Therefore, the rotation of the drive shaft is performed by changing the stator rotating magnetic field angular velocity ω _s while driving the engine at a rotational speed with high engine efficiency, that is, maintaining the rotational speed of the inner rotor 300 at a rotational speed with high engine efficiency. A shift that changes the speed can be performed.

For example, when shifting is performed while maintaining the inner rotor angular speed ω _pm at an angular speed with high engine efficiency, the outer rotor angular speed ω _m is changed so as to be the rotational speed of the target drive shaft corresponding to the shift. At this time, whether or not the inner rotor angular velocity ω _pm is maintained at an angular velocity with high engine efficiency can be confirmed by the rotation angle of the inner rotor 300 obtained from the resolver sensor 32.

Further, the outer rotor angular speed ω _m is controlled to be a target outer rotor angular speed that is determined according to the target rotational speed of the drive shaft. Specifically, as the actual outer rotor angular velocity omega _m is the target outer rotor angular velocity, the frequency I of the three-phase alternating current supplied to the armature coil 104 of the stator 100 (fs) is feedback controlled.

The stator rotating magnetic field angular velocity ω _s can be calculated from the actual inner rotor angular velocity ω _pm obtained from the resolver sensor 32, the actual outer rotor angular velocity ω _m obtained from the resolver sensor 31, and the above equation (2).

  FIG. 15 is a block diagram illustrating an overview of the feedback control described above. Various calculations in FIG. 15 are executed by the electronic control device 400 mounted on the vehicle.

As shown in FIG. 15, the electronic control unit 400 includes a difference P _m ω _m −P _pm between the actual outer rotor angular velocity ω _m obtained from the resolver sensor 31 and the actual inner rotor angular velocity ω _pm obtained from the resolver sensor 32. The stator rotating magnetic field angular velocity ω _s is calculated based on ω _pm and the number of pole pairs P _s of the stator 100.

In the present embodiment, the actual inner rotor angular velocity ω _pm is directly detected by the resolver sensor 32. However, the present invention is not limited to this. For example, the crank angular velocity detected by a crank angle sensor (not shown) provided in the engine 401 is used. May be used as the inner rotor angular velocity ω _pm .

Next, the electronic control unit 400 calculates the excitation frequency (armature excitation frequency) ω _se of the armature coil 104 of the stator 100 based on the stator rotating magnetic field angular velocity ω _s and the number of pole pairs P _s of the stator 100.

The electronic control unit 400 controls the inverter 402 based on the calculated armature excitation frequency _ωse , thereby controlling the three-phase AC frequency I (fs) supplied to the armature coil 104 of the stator 100.

  As described above, in the rotating electrical machine 1 according to the present embodiment, the outer rotor 200 has the soft magnetic pole piece portions 201A and the nonmagnetic members 202 arranged alternately in the circumferential direction. The magnetic path member 201 has a bridge portion 201B that connects adjacent pole piece portions 201A on the stator side and the inner rotor side of the nonmagnetic member 202.

  For this reason, the rotating electrical machine 1 according to the present embodiment can fill the space between the adjacent pole piece portions 201A with the nonmagnetic member 202. Further, since the adjacent pole piece portions 201A are connected by the bridge portion 201B, the pole piece portion 201A can be configured as an integral core. As a result, the pole piece portion 201A is held by the nonmagnetic member 202 and the bridge portion 201B. Therefore, the mechanical strength of the outer rotor 200 can be improved.

  Further, the outer rotor 200 is held by a clearance fit with respect to each bridge portion 201B formed by the nonmagnetic member 202 on the radially inner side and the radially outer side of the magnetic path member 201, and is attached to the pole piece portion 201A adjacent in the circumferential direction. On the other hand, it is held with an interference fit.

  For this reason, the rotating electrical machine 1 according to the present embodiment can receive the torque acting on the pole piece portion 201A when the outer rotor 200 rotates at the interference fit portion. Further, since the nonmagnetic member 202 is in surface contact with the pole piece portion 201A in the axial direction at the interference fit portion, when the torque is applied to the pole piece portion 201A, the nonmagnetic member 202 makes contact with the pole piece. A reaction acts on the portion 201A. Thereby, it can prevent that pole piece part 201A twists with respect to an axial center. Therefore, the outer rotor 200 can transmit the torque from the magnetic path member 201 and the nonmagnetic member 202 to the outer rotating shaft 210 without generating the twist of the pole piece portion 201A.

  The magnetic path member 201 is configured as an integral core in which the pole piece portion 201A and the bridge portion 201B are integrally formed. Thereby, the rotary electric machine 1 which concerns on this Embodiment can improve the mechanical strength of the magnetic path member 201 compared with the case where the pole piece part 201A and the bridge part 201B are comprised separately.

  Furthermore, the magnetic path member 201 configured as an integral core is formed by laminating a plurality of electromagnetic steel plates in the axial direction. Thereby, the rotary electric machine 1 which concerns on this Embodiment can reduce the iron loss in the outer rotor 200. FIG.

  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.

  The rotating electrical machine 1 according to the present embodiment is an inner rotor type having a radial gap structure, but may be an axial gap structure or an outer rotor structure. Further, the number of poles of the outer rotor 200 is not limited to the number of poles in the present embodiment. Moreover, a copper wire, an aluminum conductor, and a litz wire can be used for each coil. Further, as the magnetic path member 201 and the rotor core 301, an SMC (Soft Magnetic Composite) core, which is a soft magnetic composite material, can be used instead of the laminated electromagnetic steel sheet. The rotating electrical machine 1 can be applied not only to hybrid vehicles but also to other industrial fields such as wind power generators and machine tools.

  As another embodiment, a permanent magnet may be embedded in the rotor teeth 302 of the inner rotor 300. This permanent magnet is arranged so that the magnetic poles (N pole, S pole) coincide with the magnetization direction when the rotor teeth 302 function as an electromagnet by rectifying by the diodes D1, D2 or the diodes D3, D4 of the rotating electrical machine 1. Is done. In this case, the magnetic force of the permanent magnet can be added to the magnetic force of the electromagnet of the rotor teeth 302, and the inner rotor 300 can be driven to rotate with a large torque by applying a larger magnetic force. In addition, since the magnetic force sufficient to assist the electromagnetic force that functions by the induction coil I is sufficient for this permanent magnet, it is not necessary to be a rare and expensive permanent magnet such as a neodymium magnet, and can be supplied stably. A cheap and inexpensive type can be used. On the other hand, a rare and expensive permanent magnet such as a neodymium magnet may be employed. In this case, a large torque can be stably obtained.

DESCRIPTION OF SYMBOLS 1 Rotating electrical machine 100 Stator 104 Armature coil 200 Outer rotor (2nd rotor)
201 Magnetic path member (integrated core)
201A Pole piece part (soft magnetic material)
201B Bridge 202 Nonmagnetic member (nonmagnetic material)
300 Inner rotor (first rotor)

Claims (3)

A stator having an armature coil that generates magnetic flux when energized;
A first rotor that rotates by passage of the magnetic flux;
A rotary electric machine comprising: a second rotor arranged and rotated in the middle of the magnetic path of the magnetic flux passing through the first rotor;
In the second rotor, a soft magnetic body and a non-magnetic body are alternately arranged in the circumferential direction, and a bridge portion that connects the soft magnetic bodies adjacent to each other on the stator side and the first rotor side of the non-magnetic body. A rotating electric machine comprising:   2. The second rotor according to claim 1, wherein the non-magnetic body is held with a clearance fit with respect to the bridge portion and is held with an interference fit with respect to the adjacent soft magnetic body. Rotating electric machine. The second rotor has an integral core in which the soft magnetic body and the bridge portion are integrally formed,
The rotating electrical machine according to claim 1, wherein the integral core is formed by laminating a plurality of electromagnetic steel plates.

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