JP2011205815A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently execute cooling of slip rings and brushes without increasing the size of a configuration of a rotary electric machine.SOLUTION: Each air-blowing blade 100 is erected on each bus bar 99u, 99v, and 99w for electrically connecting each slip ring 97u, 97v, and 97w with each rotor winding 30. Cooling air is generated by air-blowing blades 100 during rotation of an input shaft 34. The cooling air is blown against the slip rings 97 and brushes 98 to cool the slip rings 97u, 97v, and 97w and the brushes 98u, 98v, and 98w.

Description

  The present invention relates to a rotating electrical machine, and more particularly, to a rotating electrical machine in which a rotor conductor is disposed in a rotor and current flows through the rotor conductor via a slip ring and a brush.

  The related art of a power transmission device provided with this type of rotating electrical machine is disclosed in Patent Document 1 below. The power transmission device according to Patent Document 1 includes a first rotor in which windings are disposed and mechanically coupled to an engine, and a magnet that is electromagnetically coupled to the windings of the first rotor and is mechanically disposed on a drive shaft. A second rotor coupled to the stator, a stator provided with a winding electromagnetically coupled to the magnet of the second rotor, a slip ring electrically connected to the winding of the first rotor, and a slip ring; A brush that is in electrical contact, a first inverter that is controlled so as to be able to transfer power between the battery and the stator winding, and a power between the battery and the first rotor via the slip ring and the brush. And a second inverter that is controlled so as to be able to transmit and receive. In Patent Document 1, the power from the engine transmitted to the first rotor is transmitted to the second rotor by electromagnetic coupling between the windings of the first rotor and the magnets of the second rotor. The shaft can be driven. Furthermore, since power can be transferred between the battery and the winding of the first rotor via the second inverter, by controlling the power of the winding of the first rotor by the second inverter, The rotation speed can be controlled. In this case, when the rotation speed of the first rotor is higher than the rotation speed of the second rotor, the generated power of the winding of the first rotor is supplied to the battery side via the second inverter, and the rotation of the first rotor When the speed is lower than the rotational speed of the second rotor, the battery power is supplied to the windings of the first rotor via the second inverter. Further, the electromagnetic coupling between the stator winding and the magnet of the second rotor causes the second rotor to generate power using the electric power supplied from the battery side to the stator winding via the first inverter. Therefore, the torque transmitted to the drive shaft can be controlled by controlling the power supply to the stator winding by the first inverter.

JP-A-9-56010 JP 2009-177993 A JP 2008-259346 A JP 2009-73472 A JP 2009-274536 A

  In Patent Document 1, when the engine power is transmitted to the drive shaft by the torque acting between the first rotor and the second rotor, an alternating current is applied to the winding of the first rotor via the slip ring and the brush. The slip ring and brush generate heat by flowing. Also, the slip ring and the brush generate heat due to frictional heat generated when the slip ring slides on the brush when the first rotor rotates. Therefore, in order to prevent the slip ring and the brush from overheating, it is desirable to cool and dissipate the slip ring and the brush. However, if a device for cooling and radiating the slip ring and the brush is separately provided, the configuration of the rotating electrical machine becomes large.

  In the AC generator of Patent Document 2, a ventilation hole for introducing outside air is provided in the brush holder, the sliding portion of the brush is cooled by outside air from the ventilation hole, and the abrasion powder of the brush is excluded. However, in patent document 2, when cooling a brush, it relies on the air volume which arises when a slip ring rotates, and in order to cool efficiently, the apparatus for cooling is needed separately.

  Moreover, in the alternating current generator of patent document 3, the convex part extended along an axial direction is formed in the position between a pair of slip rings in a rotating shaft. By the rotation of the convex portion, the cooling air introduced from the suction side opening below the slip ring flows along the slip ring rotation direction and is discharged from the discharge side opening below the slip ring. However, in Patent Document 3, since the shaft diameter is small and a sufficient air volume cannot be expected, the introduced cooling air mainly flows under the slip ring. Air flow is unlikely to occur.

  An object of the present invention is to efficiently cool a slip ring and a brush without causing an increase in the size of a rotating electrical machine.

  The rotating electrical machine according to the present invention employs the following means in order to achieve the above-described object.

  A rotating electrical machine according to the present invention includes a rotor attached to a rotating shaft and provided with a rotor conductor, a slip ring attached to the rotating shaft and in electrical contact with a brush, a slip ring and a rotor conductor, And a bus ring for electrically connecting the bus bar, and a fan blade for supplying cooling air to at least one of the slip ring and the brush when the rotary shaft rotates. It is a summary.

  According to the present invention, it is possible to cool at least one of the slip ring and the brush by sending the cooling air generated by the blowing blade during rotation of the rotating shaft to at least one of the slip ring and the brush. In that case, if the space around the slip ring is narrow because the air blowing blade is installed by using the bus bar to electrically connect the slip ring and the rotor conductor Even so, it is possible to install a blowing blade, which does not lead to an increase in the size of the rotating electrical machine. Furthermore, it becomes easy to dispose the blowing blade close to at least one of the slip ring and the brush, and at least one of the slip ring and the brush can be efficiently cooled.

  A rotating electrical machine according to the present invention includes a rotor attached to a rotating shaft and provided with a rotor conductor, a slip ring attached to the rotating shaft and in electrical contact with a brush, a slip ring and a rotor. And a slip ring module member having a bus bar for electrically connecting the conductor, and the cooling bar is provided on the bus bar.

  According to the present invention, the heat generated in the slip ring is transmitted to the cooling fin provided in the bus bar and is radiated from the cooling fin, whereby the slip ring can be cooled. In that case, if the space around the slip ring is narrow because the cooling fins are installed by using the bus bar to electrically connect the slip ring and the rotor conductor Even so, it is possible to install cooling fins, which does not lead to an increase in the size of the rotating electrical machine. Furthermore, it becomes easy to dispose the cooling fin close to the slip ring, and the slip ring can be cooled efficiently.

  In one aspect of the present invention, the cooling fin is preferably provided on the bus bar so as to be inclined in the rotation axis direction with respect to the slip ring circumferential direction.

  In one aspect of the present invention, in the slip ring module member, the slip ring is attached to the outer periphery of the insulating member attached to the rotating shaft, and the bus bar is exposed to the outside of the insulating member through the inside of the insulating member, It is preferable that a ventilation path facing the slip ring and the bus bar is formed in the insulating member.

  In one aspect of the present invention, the cooling fin is preferably provided on the bus bar along the circumferential direction of the slip ring.

  In one embodiment of the present invention, the bus bar is preferably curved along the circumferential direction of the slip ring.

  A rotating electrical machine according to the present invention includes a rotor attached to a rotating shaft and provided with a rotor conductor, a slip ring attached to the rotating shaft and in electrical contact with a brush, a slip ring and a rotor. A slip ring module member having a bus bar for electrically connecting the conductor, and the bus bar is curved along the circumferential direction of the slip ring.

  According to the present invention, since the bus bar is curved along the circumferential direction of the slip ring, the surface area and the heat capacity of the bus bar can be increased efficiently without increasing the size of the slip ring module, and the heat dissipation is improved. Can be improved. Therefore, the slip ring can be efficiently cooled without increasing the size of the rotating electrical machine.

  In one aspect of the present invention, in the slip ring module member, each of the plurality of bus bars is electrically connected to each of the plurality of slip rings, and the plurality of bus bars are electrically connected to each other along the slip ring circumferential direction. It is preferable that they are arranged at a minute interval to be insulated.

  In one aspect of the present invention, a stator provided with a stator conductor capable of generating a rotating magnetic field when an alternating current flows, and a first rotor that is a rotor provided with the rotor conductor are provided. Relative rotation is possible, torque acts between the first rotor and the rotating magnetic field generated by the stator conductor in response to the rotating magnetic field generated by the alternating current flowing through the rotor conductor. It is preferable to further include a second rotor in which torque acts between the stator and the stator.

  As described above, according to the present invention, the slip ring and the brush can be efficiently cooled without increasing the size of the rotating electric machine.

It is a figure which shows schematic structure of a hybrid drive device provided with the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows schematic structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows schematic structure of the rotary electric machine which concerns on embodiment of this invention. FIG. 3 is a diagram illustrating a configuration example of an input side rotor 28, an output side rotor 18, and a stator 16. It is a figure which shows schematic structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows schematic structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the rotary electric machine which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the rotary electric machine which concerns on embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.

  1-3 is a figure which shows the outline of a structure of a hybrid drive device provided with the rotary electric machine 10 which concerns on embodiment of this invention, FIG. 1 shows the outline of the whole structure, FIG. The outline of a structure is shown. The hybrid drive device according to the present embodiment is provided between an engine (internal combustion engine) 36 provided as a prime mover capable of generating power (mechanical power), and between the engine 36 and a drive shaft 37 (wheels 38). A transmission (mechanical transmission) 44 capable of changing the transmission gear ratio, and a rotating electrical machine 10 provided between the engine 36 and the transmission 44 are provided. In addition, about the hybrid drive device which concerns on this embodiment, it can be used as a power output device for driving a vehicle, for example.

  The rotating electrical machine 10 includes a stator 16 fixed to the case housing, a first rotor 28 that can rotate relative to the stator 16, and a predetermined gap between the stator 16 and the first rotor 28 in a radial direction orthogonal to the rotor rotation axis. The second rotor 18 that faces the stator 16 and the first rotor 28 and is opposed to the first rotor 28, the slip ring module 95, and the brush module 96 are provided. The stator 16 is disposed at a position radially outward from the first rotor 28 and spaced from the first rotor 28, and the second rotor 18 is positioned between the stator 16 and the first rotor 28 in the radial direction. Is arranged. That is, the first rotor 28 is disposed opposite to the second rotor 18 at a position radially inward of the second rotor 18, and the stator 16 is disposed opposite to the second rotor 18 at a position radially outward from the second rotor 18. Has been. The first rotor 28 is attached to the input shaft 34 (first rotation shaft) of the rotating electrical machine 10, and the input shaft 34 is mechanically connected to the engine 36, so that the input shaft 34 (first rotor 28) Power from the engine 36 is transmitted. On the other hand, the second rotor 18 is attached to the output shaft 24 (second rotational shaft) of the rotating electrical machine 10, and the output shaft 24 is mechanically connected to the drive shaft 37 via the transmission 44, so that the drive shaft Power from the output shaft 24 (second rotor 18) is transmitted to the wheel 37 (wheel 38) after being shifted by the transmission 44. In the following description, the first rotor 28 is an input side rotor, and the second rotor 18 is an output side rotor.

  The input-side rotor 28 includes a rotor core (first rotor core) 52 and a plurality of (for example, three-phase) rotor windings 30 disposed on the rotor core 52 along the circumferential direction thereof. When a plurality of phases (for example, three phases) of alternating current flows through the plurality of rotor windings 30, the rotor windings 30 can generate a rotating magnetic field that rotates in the circumferential direction of the rotor.

  The stator 16 includes a stator core (stator core) 51 and a plurality of (for example, three-phase) stator windings 20 disposed on the stator core 51 along the circumferential direction thereof. When a plurality of phases (for example, three phases) of alternating current flows through the plurality of stator windings 20, the stator windings 20 can generate a rotating magnetic field that rotates in the stator circumferential direction.

  The output-side rotor 18 includes a rotor core (second rotor core) 53 and permanent magnets 32 and 33 that are disposed on the rotor core 53 along the circumferential direction thereof and generate a field magnetic flux. The permanent magnet 32 is disposed on the outer peripheral portion of the rotor core 53 so as to face the stator 16 (stator core 51), and the permanent magnet 33 is opposed to the input-side rotor 28 (rotor core 52) on the inner peripheral portion of the rotor core 53. Arranged. Here, the permanent magnets 32 and 33 can also be integrated.

  A more detailed configuration example of the input side rotor 28, the output side rotor 18, and the stator 16 is shown in FIG. In the example shown in FIG. 4, the input side rotor 28, the output side rotor 18, and the stator 16 are arranged concentrically. In the stator core 51 of the stator 16, a plurality of teeth 51 a protruding radially inward (toward the output-side rotor 18) are arranged at intervals along the circumferential direction of the stator. The magnetic pole is configured by being wound around the teeth 51a. A plurality of teeth 52a protruding radially outward (toward the output-side rotor 18) are arranged on the rotor core 52 of the input-side rotor 28 at intervals along the circumferential direction of the rotor. Is wound around these teeth 52a, thereby forming a magnetic pole. The teeth 51a of the stator 16 and the permanent magnets 32 of the output-side rotor 18 are opposed to each other in the radial direction perpendicular to the rotation center axis of the output-side rotor 18 (which coincides with the rotation center axis of the input-side rotor 28). The teeth 52a of the side rotor 28 and the permanent magnets 33 of the output side rotor 18 are arranged to face each other in the radial direction. The winding axis of the stator winding 20 and the winding axis of the rotor winding 30 coincide with this radial direction (the direction in which the input side rotor 28 and the output side rotor 18 face each other). The permanent magnets 32 and 33 are arranged at intervals in the circumferential direction of the rotor, and the permanent magnet 32 is embedded in the rotor core 53 in a V shape. However, the permanent magnets 32 and 33 may be exposed on the surface (outer peripheral surface or inner peripheral surface) of the output-side rotor 18 or may be embedded in the output-side rotor 18 (in the rotor core 53). .

  The clutch 48 is provided in parallel with the rotating electrical machine 10 (the input-side rotor 28 and the output-side rotor 18) between the engine 36 and the transmission 44. By engaging / disengaging the clutch 48, mechanical engagement / disengagement between the input-side rotor 28 and the output-side rotor 18 can be selectively performed. By engaging the clutch 48 and mechanically engaging the input-side rotor 28 and the output-side rotor 18, the input-side rotor 28 and the output-side rotor 18 are integrally rotated at the same rotational speed. On the other hand, by releasing the clutch 48 and releasing the mechanical engagement between the input-side rotor 28 and the output-side rotor 18, a difference in rotational speed between the input-side rotor 28 and the output-side rotor 18 is allowed. The clutch 48 here can be switched between engagement and disengagement using, for example, hydraulic pressure or electromagnetic force, and further adjusts the fastening force by adjusting the hydraulic pressure or electromagnetic force supplied to the clutch 48. You can also.

  The slip ring module 95 is attached to the input shaft 34 at a distance from the input side rotor 28 in the rotor rotation axis direction, and is mechanically coupled to the input side rotor 28. The slip ring module 95 has a slip ring 97 electrically connected to each phase of the rotor winding 30. The rotation-fixed brush module 96 has a brush 98 that is pressed against the slip ring 97 to make electrical contact. The slip ring module 95 rotates with the input side rotor 28 while the slip ring 97 slides on the brush 98 (while maintaining electrical contact with the brush 98).

  The chargeable / dischargeable power storage device 42 provided as a direct current power source can be constituted by a secondary battery, for example, and stores electrical energy. The inverter 40 can be realized by a known configuration including a switching element and a diode (rectifier element) connected in reverse parallel to the switching element. The inverter 40 converts the DC power from the power storage device 42 to AC ( For example, it can be converted into a three-phase alternating current) and supplied to each phase of the stator winding 20. Furthermore, the inverter 40 can also convert power in a direction in which alternating current flowing in each phase of the stator winding 20 is converted into direct current and electric energy is collected in the power storage device 42. Thus, the inverter 40 can perform bidirectional power conversion between the power storage device 42 and the stator winding 20.

  The rectifier 93 is electrically connected to the brush 98, and rectifies the AC power from the rotor winding 30 taken out by the slip ring 97 and the brush 98 with a diode (rectifier element) and converts it into DC. The step-up converter (DC-DC converter) 94 can be realized by a known configuration including a switching element and a diode (rectifier element), and boosts (voltage conversion) DC power rectified by the rectifier 93 by the switching operation of the switching element. And output. The DC power boosted (voltage converted) by the boost converter 94 can be supplied to each phase of the stator winding 20 after being converted to AC by the inverter 40. That is, inverter 40 can convert either (at least one) of the DC power boosted by boost converter 94 and the DC power from power storage device 42 to AC and supply it to each phase of stator winding 20. It is. Therefore, power conversion can be performed between the rotor winding 30 and the stator winding 20. Further, the DC power boosted by the boost converter 94 can be recovered by the power storage device 42. Here, the rectifier 93 performs power conversion only in one direction from the slip ring 97 side to the boost converter 94 side, and the boost converter 94 is unidirectional from the rectifier 93 side to the power storage device 42 side (or the inverter 40 side). Only perform power conversion. Therefore, rectifier 93 and boost converter 94 perform power conversion in only one direction from rotor winding 30 side to power storage device 42 side (or inverter 40 side). Instead of the step-up converter 94, a step-down converter or a step-up / step-down converter can be provided as a DC-DC converter.

  The inverter 41 is electrically connected to the brush 98 and is provided in parallel with the rectifier 93 and the boost converter 94. The inverter 41 can be realized by a known configuration including a switching element and a diode (rectifier element) connected in reverse parallel to the switching element. The inverter 41 converts DC power from the power storage device 42 to AC ( For example, it can be converted into a three-phase alternating current) and supplied to each phase of the rotor winding 30 via the brush 98 and the slip ring 97.

  The electronic control unit 50 controls the alternating current flowing through each phase of the stator winding 20 by controlling the switching operation of the switching element of the inverter 40. The electronic control unit 50 controls the boost ratio (voltage conversion ratio) in the boost converter 94 by controlling the duty ratio when the switching element of the boost converter 94 is switched. The alternating current flowing in each phase is controlled. The electronic control unit 50 can also control the alternating current flowing in each phase of the rotor winding 30 by controlling the switching operation of the switching element of the inverter 41. The electronic control unit 50 also performs control for switching mechanical engagement / release of the input side rotor 28 and the output side rotor 18 by switching engagement / release of the clutch 48. Furthermore, the electronic control unit 50 also controls the operating state of the engine 36 and the speed ratio of the transmission 44.

  When a plurality of phases (for example, three phases) of alternating current flows through the plurality of stator windings 20 by the switching operation of the inverter 40, the stator windings 20 generate a rotating magnetic field that rotates in the circumferential direction of the stator. The torque (magnet torque) can be applied to the output-side rotor 18 by electromagnetic interaction (attraction and repulsion) between the rotating magnetic field generated in the stator winding 20 and the field magnetic flux generated in the permanent magnet 32. The output side rotor 18 can be rotationally driven. That is, the electric power supplied from the power storage device 42 to the stator winding 20 can be converted into the power (mechanical power) of the output-side rotor 18, and the stator 16 and the output-side rotor 18 are used as a synchronous motor (PM motor unit). Can function. Further, the inverter 40 can also convert the alternating current flowing in each phase of the stator winding 20 into a direct current and recover the electric energy in the power storage device 42. In that case, the motive power of the output-side rotor 18 is converted into the electric power of the stator winding 20 and recovered by the power storage device 42. As described above, the stator winding 20 of the stator 16 and the permanent magnet 32 of the output side rotor 18 are electromagnetically coupled, so that the rotating magnetic field generated in the stator winding 20 is applied to the output side rotor 18. A torque (magnet torque) can be applied between the stator 16 and the output-side rotor 18. Further, for example, as shown in FIG. 4, an example in which a magnetic material (ferromagnetic material) is disposed between the permanent magnets 32 as salient pole portions facing the stator 16 (tooth 51a), or the permanent magnet 32 is on the output side. In the example embedded in the rotor 18 (in the rotor core 53), the reluctance torque in addition to the magnet torque is also applied to the stator 16 and the output side rotor in response to the rotating magnetic field generated by the stator 16 acting on the output side rotor 18. 18 to act. The electronic control unit 50 controls the torque acting between the stator 16 and the output-side rotor 18 by controlling the amplitude and phase angle of the alternating current flowing through the stator winding 20 by the switching operation of the inverter 40, for example. Can do.

  Further, as the input side rotor 28 rotates relative to the output side rotor 18, a rotation difference is generated between the input side rotor 28 (rotor winding 30) and the output side rotor 18 (permanent magnet 33). An induced electromotive force is generated in the winding 30, and an induced current (alternating current) flows in the rotor winding 30 due to the induced electromotive force, thereby generating a rotating magnetic field. The torque can be applied to the output-side rotor 18 by the electromagnetic interaction between the rotating magnetic field generated by the induced current of the rotor winding 30 and the field flux of the permanent magnet 33, and the output-side rotor 18 is driven to rotate. Can do. As described above, the rotor winding 30 of the input-side rotor 28 and the permanent magnet 33 of the output-side rotor 18 are electromagnetically coupled, so that the rotating magnetic field generated in the rotor winding 30 acts on the output-side rotor 18. As a result, torque (magnet torque) acts between the input-side rotor 28 and the output-side rotor 18. Therefore, power (mechanical power) can be transmitted between the input-side rotor 28 and the output-side rotor 18, and the input-side rotor 28 and the output-side rotor 18 can function as an induction electromagnetic coupling unit.

  When generating torque (hereinafter referred to as electromagnetic coupling torque) between the input side rotor 28 and the output side rotor 18 by the induced current of the rotor winding 30, the electronic control unit 50 outputs the output of the boost converter 94. The boost ratio in boost converter 94 is controlled so that the voltage is higher than the voltage of power storage device 42. As a result, a current flows from the boost converter 94 to the wiring between the power storage device 42 and the inverter 40, and an induced current flows through the rotor winding 30. Works. In that case, the electronic control unit 50 acts between the input-side rotor 28 and the output-side rotor 18 by controlling the alternating current flowing through the rotor winding 30 by controlling the boost ratio in the boost converter 94. The electromagnetic coupling torque can be controlled (see also Patent Documents 4 and 5). On the other hand, the electronic control unit 50 controls the boost ratio in the boost converter 94 so that the output voltage of the boost converter 94 is lower than the voltage of the power storage device 42 in a state where the switching operation of the inverter 40 is not performed. Even if a rotational difference occurs between the side rotor 28 and the output side rotor 18, no induced current flows through the rotor winding 30, and no electromagnetic coupling torque acts between the input side rotor 28 and the output side rotor 18. . Also, by stopping the boosting (voltage conversion) by the boost converter 94 while maintaining the switching element in the boost converter 94 in the off state, the induced current does not flow through the rotor winding 30, and the input side rotor 28 and the output side The electromagnetic coupling torque does not act between the rotor 18 and the rotor 18.

  In addition, when a plurality of phases (for example, three phases) of alternating current flows through the plurality of phases of the rotor winding 30 by the switching operation of the inverter 41, the rotor winding 30 generates a rotating magnetic field that rotates in the circumferential direction of the rotor. The torque (magnet torque) can be applied to the input-side rotor 28 by electromagnetic interaction (attraction and repulsion) between the rotating magnetic field generated in the rotor winding 30 and the field magnetic flux generated in the permanent magnet 33. The input side rotor 28 can be rotationally driven. On the other hand, by maintaining the switching element of the inverter 41 in the OFF state and stopping the switching operation, no AC current flows through the rotor winding 30, and torque acts between the input side rotor 28 and the output side rotor 18. Disappear. In this manner, a drive circuit including the rectifier 93, the step-up converter 94, and the inverter 41 is configured to allow or prevent an alternating current from flowing through the rotor winding 30 via the slip ring 97 and the brush 98. Can do.

  Next, the operation of the hybrid drive device according to this embodiment will be described.

  When the engine 36 is generating power, the power of the engine 36 is transmitted to the input side rotor 28, and the input side rotor 28 is rotationally driven in the engine rotation direction. When the rotational speed of the input side rotor 28 becomes higher than the rotational speed of the output side rotor 18 in a state where the clutch 48 is released, an induced electromotive force is generated in the rotor winding 30. The electronic control unit 50 controls the boost ratio in the boost converter 94 so that the output voltage of the boost converter 94 is higher than the voltage of the power storage device 42, so that the rotor winding 30 is connected via the slip ring 97 and the brush 98. Induced current (alternating current) flows, and electromagnetic coupling torque in the rotational direction of the engine acts on the output side rotor 18 from the input side rotor 28 by the electromagnetic interaction between the induced current and the field flux of the permanent magnet 33. The rotor 18 is rotationally driven in the engine rotation direction. Thus, the power from the engine 36 transmitted to the input side rotor 28 is transmitted to the output side rotor 18 by electromagnetic coupling between the rotor winding 30 of the input side rotor 28 and the permanent magnet 33 of the output side rotor 18. The The power transmitted to the output side rotor 18 is transmitted to the drive shaft 37 (wheels 38) after being shifted by the transmission 44, and used for forward driving of the load such as forward drive of the vehicle. Therefore, the wheel 38 can be rotationally driven in the forward direction using the power of the engine 36, and the vehicle can be driven in the forward direction. Further, since the rotation difference between the input side rotor 28 and the output side rotor 18 can be allowed, the engine 36 does not stall even if the rotation of the wheels 38 is stopped. Therefore, the rotating electrical machine 10 can function as a starting device, and there is no need to separately provide a starting device such as a friction clutch or a torque converter.

  Further, AC power generated in the rotor winding 30 is taken out via the slip ring 97 and the brush 98. The extracted AC power is rectified to DC by a rectifier 93, and the rectified DC power is boosted by a boost converter 94. Then, the DC power from the boost converter 94 is converted into AC by the inverter 40 and then supplied to the stator winding 20, whereby a rotating magnetic field is formed in the stator 16. The torque in the engine rotation direction can be applied to the output side rotor 18 also by the electromagnetic interaction between the rotating magnetic field of the stator 16 and the field flux of the permanent magnet 32 of the output side rotor 18. As a result, a torque amplification function for amplifying the torque of the output side rotor 18 in the engine rotation direction can be realized. It is also possible to collect DC power from boost converter 94 in power storage device 42. Note that when the switching operation of the boost converter 94 is performed, the switching operation of the inverter 41 is not performed.

  Further, by controlling the switching operation of the inverter 40 so that electric power is supplied from the power storage device 42 to the stator winding 20, the wheel 38 is rotated in the normal rotation direction using the power of the engine 36, and the stator winding 20. The rotational drive of the wheel 38 in the forward rotation direction can be assisted by the power of the output-side rotor 18 generated using the power supplied to the wheel. Further, at the time of load deceleration operation, the electronic control unit 50 controls the switching operation of the inverter 40 so that power is recovered from the stator winding 20 to the power storage device 42, so that the load power is transmitted to the stator winding 20 and the permanent magnet. The electric power of the stator winding 20 can be converted by the electromagnetic coupling with 32 and recovered in the power storage device 42.

  Further, by engaging the clutch 48 and mechanically connecting the input side rotor 28 and the output side rotor 18, an alternating current does not flow through the rotor winding 30, and the input side rotor 28 and the output side rotor 18 are not connected. Even if no torque acts on the vehicle, the power from the engine 36 can be transmitted to the wheel 38 via the clutch 48, and the vehicle can be driven in the forward direction using the power of the engine 36.

  In addition, when EV (Electric Vehicle) traveling is performed by driving the load using the power of the rotating electrical machine 10 without using the power of the engine 36 (rotating the wheel 38), the electronic control unit 50 By controlling the switching operation, drive control of the load is performed. For example, the electronic control unit 50 controls the switching operation of the inverter 40 so that the DC power from the power storage device 42 is converted into AC and supplied to the stator winding 20, thereby supplying power to the stator winding 20. Is converted into power of the output-side rotor 18 by electromagnetic coupling between the stator winding 20 and the permanent magnet 32, and the drive shaft 37 (wheel 38) is rotationally driven. Thus, even if the engine 36 is not generating power, the wheels 38 can be rotationally driven by supplying power to the stator winding 20. In addition, when performing EV traveling, the clutch 48 is controlled to a released state.

  When starting the engine 36, the electronic control unit 50 converts the DC power from the power storage device 42 into AC by the inverter 41 and supplies it to the rotor winding 30 via the slip ring 97 and the brush 98. By controlling the switching operation of the inverter 41, the engine 36 can be cranked using the power supplied to the rotor winding 30. In this way, AC power for starting the engine 36 is supplied to the rotor winding 30. During cranking of the engine 36, torque is applied to the input-side rotor 28 connected to the engine 36 by electromagnetic interaction between the rotating magnetic field of the input-side rotor 28 and the field flux of the permanent magnet 33 of the output-side rotor 18. The output side rotor 18 also receives the reaction torque. Therefore, when starting the engine 36 during EV traveling, the switching operation of the inverter 40 is controlled so that electric power is supplied from the power storage device 42 to the stator winding 20 and the torque that cancels the reaction torque is applied to the output-side rotor 18. As a result, the output-side rotor 18 can be rotationally driven using the power supplied to the stator winding 20. In addition, when starting the engine 36, the clutch 48 is controlled to a released state. Further, when the switching operation of the inverter 41 is performed, the switching operation of the boost converter 94 is not performed.

  In the present embodiment, when the power of the engine 36 is transmitted to the wheel 38 by the torque acting between the input side rotor 28 and the output side rotor 18, the rotor winding 30 is passed through the slip ring 97 and the brush 98. As the alternating current flows, the slip ring 97 and the brush 98 generate heat. Further, the slip ring 97 and the brush 98 also generate heat due to frictional heat generated when the slip ring 97 slides on the brush 98 when the input side rotor 28 rotates. Therefore, in order to prevent the slip ring 97 and the brush 98 from overheating, it is desirable to cool and dissipate the slip ring 97 and the brush 98. Hereinafter, a configuration example for that purpose will be described.

  5 and 6 are diagrams showing configuration examples of the slip ring module 95 and the brush module 96. FIG. 5 is a view seen from the rotor rotation axis direction, and FIG. 6 is a view perpendicular to the rotor rotation axis direction. The figure is shown. The slip ring module 95 is attached to the input shaft 34 at a distance from the input side rotor 28 in the rotor rotation axis direction. The slip ring module 95 includes a substantially cylindrical insulating member 90 made of resin or the like attached to the outer periphery of the input shaft 34, and a slip ring 97 attached to the outer periphery of the insulating member 90 and electrically contacting the brush 98. The member 90 is provided along the rotor rotation axis direction, and has a bus bar 99 for electrically connecting the slip ring 97 and the rotor winding 30. In the example in which the rotor winding 30 is a three-phase winding composed of a u-phase rotor winding, a v-phase rotor winding, and a w-phase rotor winding, a slip ring provided corresponding to each phase of the rotor winding 30 97u, 97v, and 97w are arrange | positioned mutually spaced apart regarding the rotor rotating shaft direction. The bus bars 99u, 99v, 99w provided corresponding to the respective phases of the rotor winding 30 are spaced from each other in the slip ring circumferential direction (rotation direction), and the slip rings 97u, 97v, 97w Each is electrically connected. Wiring holes 78 u, 78 v, 78 w are formed in the input shaft 34. Electric wiring 79 u electrically connected to the u-phase rotor winding 30 and electricity connected to the v-phase rotor winding 30. The electrical wiring 79v and the electrical wiring 79w electrically connected to the w-phase rotor winding 30 are electrically connected to the bus bars 99u, 99v, and 99w through the wiring holes 78u, 78v, and 78w, respectively. The bus bars 99u, 99v, and 99w are exposed to the outside of the insulating member 90 through the inside of the insulating member 90. The exposed portions 99a, 99b, and 99c are electrically connected to the electrical wirings 79u, 79v, and 79w, respectively. It is connected to the. As a result, the phases of the slip rings 97u, 97v, 97w and the rotor winding 30 are electrically connected via the bus bars 99u, 99v, 99w. However, in FIG. 6, for the sake of convenience of explanation, portions embedded in the insulating member 90 in the bus bars 99u and 99v are also illustrated. As for the materials of the slip rings 97u, 97v, 97w and the bus bars 99u, 99v, 99w, for example, a metal having good electrical conductivity and thermal conductivity such as copper is used as a main component.

  The brush module 96 is provided corresponding to each phase of the rotor winding 30, and brushes 98 u, 98 v, 98 w electrically connected to the rectifier 93 and the inverter 41, and a brush that holds the brushes 98 u, 98 v, 98 w. It has holders 88u, 88v, 88w and heat radiating plates 89u, 89v, 89w for radiating heat from the brushes 98u, 98v, 98w. The brushes 98u, 98v, and 98w are spaced apart from each other in the rotor rotation axis direction, and are in electrical contact with the slip rings 97u, 97v, and 97w, respectively. Although not shown in FIGS. 5 and 6, a plurality of brush modules 96 may be arranged at intervals with respect to the slip ring circumferential direction (rotation direction). A case housing 80 to which the stator 16 is fixed is located between the input side rotor 28 and the slip ring module 95 with respect to the rotor rotation axis direction. The case housing 80 allows the slip ring module 95 and the input side rotor to be located. 28 are separated from each other. The input shaft 34 is rotatably supported by the case housing 80 via a seal member 84 such as an oil seal. The brush module 96 is attached to the case housing 80.

  In the present embodiment, air blowing blades 100 are erected on the outer surface of each bus bar 99u, 99v, 99w in the rotor radial direction. The erection direction of each blowing blade 100 coincides (or substantially coincides) with the rotor radial direction. The blower blades 100 are provided in portions 99a, 99b, and 99c exposed to the outside of the insulating members in the respective bus bars 99u, 99v, and 99w, and are disposed in close proximity to the slip ring 97u in the rotor rotation axis direction. Each blowing blade 100 projects outward from the outer periphery of the slip ring 97u, 97v, 97w in the rotor radial direction so that it can face the brushes 98u, 98v, 98w in the rotor rotational axis direction when the input shaft 34 rotates. Is formed. Each blower blade 100 is formed along a direction inclined in the rotor rotation axis direction with respect to the slip ring circumferential direction (rotation direction). About the material of the ventilation blade | wing 100, the same material as bus bar 99u, 99v, 99w, for example, metals, such as copper, can also be used as a main component, and a different material from bus bar 99u, 99v, 99w can also be used. .

  When the input shaft 34 (input-side rotor 28) rotates, cooling air is generated by the rotation of the blowing blade 100 together with the slip ring module 95, and is generated by the blowing blade 100 as shown by an arrow A in FIG. Cooling air is sent to and contacts the slip rings 97u, 97v, 97w. As a result, the slip rings 97u, 97v, 97w are cooled. The cooling air generated by the blowing blades 100 is also sent to and contacted with the brushes 98u, 98v, 98w, so that the brushes 98u, 98v, 98w are also cooled. Further, the cooling air generated by the blowing blade 100 is sent to the sliding portions of the slip rings 97u, 97v, 97w and the brushes 98u, 98v, 98w, so that the slip rings 97u, 97v, 97w are brushes 98u, 98v, 98w. It is also possible to remove the abrasion powder of the brushes 98u, 98v, 98w generated when sliding with respect to. The cooling air (air) sent to the slip rings 97u, 97v, 97w and the brushes 98u, 98v, 98w is the space between the slip rings 97u, 97v, 97w, the brushes 98u, 98v, as shown by the arrow B in FIG. , Flows through the space between 98w.

  As described above, according to the configuration example shown in FIGS. 5 and 6, the cooling air generated by the blower blade 100 during the rotation of the input shaft 34 is blown against the slip ring 97 and the brush 98. 98 cooling can be performed. At that time, since the air blowing blade 100 is installed by using the bus bar 99 for electrical connection between the slip ring 97 and the rotor winding 30 and has a role of cooling, the periphery of the slip ring 97 Even if the space is small, it is possible to install the blowing blade 100. As a result, the length of the rotating electrical machine 10 in the rotor rotation axis direction is not increased, and the configuration of the rotating electrical machine 10 is not increased in size. Furthermore, it becomes easy to dispose the air blowing blade 100 close to the slip ring 97 and the brush 98, the cooling of the slip ring 97 and the brush 98 can be efficiently performed, and the removal of wear powder of the brush 98 is also efficient. Can be done.

  In the configuration example shown in FIGS. 5 and 6, the cooling blade generated by the blowing blade 100 when the input shaft 34 rotates is sent to only the slip ring 97 out of the slip ring 97 and the brush 98. It is also possible to install 100. It is also possible to install the blowing blade 100 so that the cooling air generated by the blowing blade 100 during rotation of the input shaft 34 is sent only to the brush 98 of the slip ring 97 and the brush 98.

  Next, another configuration example of the slip ring module 95 and the brush module 96 will be described.

  In the present embodiment, for example, as shown in FIGS. 7 and 8, ventilation paths 91 u, 91 v, 91 w can be formed in the outer peripheral portion of the insulating member 90 along the rotor rotation axis direction. Each ventilation path 91u, 91v, 91w communicates with the outside of the insulating member 90 at a position closer to the blowing blade 100 than the slip ring 97u in the rotor rotation axis direction. Further, each ventilation path 91u, 91v, 91w communicates with the outside of the insulating member 90 (a space between the slip rings 97u, 97v) at a position between the slip rings 97u, 97v with respect to the rotor rotation axis direction. 91w communicates with the outside of the insulating member 90 (the space between the slip rings 97v and 97w) at a position between the slip rings 97v and 97w in the rotor rotation axis direction. The ventilation path 91u is formed so as to face the bus bar 99u and the slip rings 97u, 97v, the ventilation path 91v is formed so as to face the bus bar 99v and the slip rings 97u, 97v, 97w, and the ventilation path 91w is defined as the bus bar. 99w and slip rings 97u, 97v, 97w are formed to face.

  In the configuration example shown in FIGS. 7 and 8, the cooling air generated by the air blowing blades 100 during rotation of the input shaft 34 (input-side rotor 28) is sent through the ventilation paths 91u, 91v, 91w as shown by the arrow A in FIG. It flows in and contacts the bus bars 99u, 99v, 99w and the slip rings 97u, 97v, 97w. Thereby, the bus bars 99u, 99v, 99w and the slip rings 97u, 97v, 97w are cooled. The cooling air sent into the air passages 91u, 91v, 91w is discharged through the space between the slip rings 97u, 97v, 97w and the space between the brushes 98u, 98v, 98w as shown by the arrow B in FIG. Is done.

  As described above, according to the configuration example shown in FIGS. 7 and 8, the cooling air generated by the blower blade 100 during the rotation of the input shaft 34 is passed through the ventilation passages 91 u, 91 v, 91 w inside the slip ring 97. By discharging from the space between them, the cooling effect of the slip ring 97 and the brush 98 can be further enhanced, and the effect of removing the abrasion powder of the brush 98 can be further enhanced.

  In the configuration example shown in FIGS. 9 and 10, a plurality of cooling fins 110 are erected on the outer surface of each bus bar 99u, 99v, 99w in the rotor radial direction. The standing direction of each cooling fin 110 coincides (or substantially coincides) with the rotor radial direction. The cooling fin 110 is provided in the portions 99a, 99b, and 99c exposed to the outside of the insulating member in the bus bars 99u, 99v, and 99w. In the example shown in FIGS. 9 and 10, each cooling fin 110 has a slip ring circumference so that a loss (windage loss) due to the rotational resistance of the cooling fin 110 is suppressed when the input shaft 34 (input-side rotor 28) rotates. It is formed along the direction (rotation direction). As for the material of the cooling fin 110, the same material as the bus bars 99u, 99v, 99w, for example, a metal such as copper can be used as a main component. However, a material having higher thermal conductivity than the bus bars 99u, 99v, and 99w can be used as the material of the cooling fin 110.

  9 and 10, heat generated in the slip rings 97u, 97v, and 97w is transmitted to the cooling fins 110 provided on the bus bars 99u, 99v, and 99w, and the cooling fins 110 having a large surface area to the outside. Heat is dissipated. As a result, the slip rings 97u, 97v, 97w are cooled. Further, the brushes 98u, 98v, and 98w that are in contact with the slip rings 97u, 97v, and 97w are also cooled. In that case, the cooling fin 110 is installed using the bus bars 99u, 99v, and 99w for electrical connection between the slip rings 97u, 97v, and 97w and the rotor winding 30 to have a role of cooling. Therefore, even if the space around the slip rings 97u, 97v, 97w is narrow, the cooling fin 110 can be installed. As a result, the length of the rotating electrical machine 10 in the rotor rotation axis direction is not increased, and the configuration of the rotating electrical machine 10 is not increased in size. Furthermore, it becomes easy to dispose the cooling fin 110 close to the slip rings 97u, 97v, 97w, and the slip rings 97u, 97v, 97w and the brushes 98u, 98v, 98w can be efficiently cooled.

  Each cooling fin 110 can also be formed along a direction inclined in the rotor rotation axis direction with respect to the slip ring circumferential direction (rotation direction) as shown in FIGS. In this configuration example, when the input shaft 34 (input-side rotor 28) rotates, a loss (windage loss) due to the rotational resistance of the cooling fin 110 occurs. However, as in the configuration example shown in FIGS. The cooling fins 110 rotate together with the slip ring module 95 to generate cooling air, and the cooling air generated by the cooling fins 110 is sent to the slip rings 97u, 97v, 97w. 97w of cooling is performed. The cooling air generated in each cooling fin 110 is also sent to the brushes 98u, 98v, 98w, so that the brushes 98u, 98v, 98w are also cooled. Further, the cooling air generated in each cooling fin 110 is sent to the sliding portions of the slip rings 97u, 97v, 97w and the brushes 98u, 98v, 98w, so that the slip rings 97u, 97v, 97w are brushes 98u, 98v, The abrasion powder of the brushes 98u, 98v, 98w generated when sliding with respect to 98w can also be removed. Thus, in the configuration examples shown in FIGS. 11 and 12, each cooling fin 110 can also function as a blowing blade, thereby cooling the slip rings 97u, 97v, 97w and the brushes 98u, 98v, 98w. The effect can be further enhanced. In that case, for example, air passages 91u, 91v, 91w as shown in FIGS. 7 and 8 are formed in the insulating member 90, and the cooling air generated in each cooling fin 110 is placed in the air passages 91u, 91v, 91w. It is also possible to send it.

  13 and 14, the plurality of bus bars 99u, 99v, and 99w are curved along the slip ring circumferential direction (rotation direction). The plurality of bus bars 99u, 99v, 99w are arranged at a minute interval that is electrically insulated from each other along the circumferential direction (rotational direction) of the slip ring. The heat generated in the slip rings 97u, 97v, 97w is transmitted to the bus bars 99u, 99v, 99w, and is radiated to the outside from the portions 99a, 99b, 99c exposed to the outside of the insulating member. As a result, the slip rings 97u, 97v, 97w are cooled. Further, the brushes 98u, 98v, and 98w that are in contact with the slip rings 97u, 97v, and 97w are also cooled. In that case, the bus bars 99u, 99v, 99w are curved along the circumferential direction of the slip ring, thereby efficiently increasing the surface area and heat capacity of the bus bars 99u, 99v, 99w without increasing the size of the slip ring module 95. The heat dissipation can be improved. Therefore, the slip rings 97u, 97v, 97w and the brushes 98u, 98v, 98w can be efficiently cooled without increasing the size of the rotating electrical machine 10.

  Further, in the configuration example shown in FIGS. 15 and 16, compared to the configuration example shown in FIGS. 13 and 14, the bus bars 99 u, 99 v, 99 w curved along the circumferential direction (rotation direction) of the slip ring are on the outer side in the rotor radial direction. A plurality of cooling fins 110 are erected on the surface. In the example shown in FIGS. 15 and 16, each cooling fin 110 is formed along a direction inclined in the rotor rotation axis direction with respect to the slip ring circumferential direction (rotation direction). Therefore, each cooling fin 110 rotates together with the slip ring module 95 to generate cooling air, and each cooling fin 110 also functions as a blowing blade. However, it is also possible to form each cooling fin 110 along the circumferential direction of the slip ring so that loss (windage loss) due to rotational resistance of the cooling fin 110 is suppressed when the input shaft 34 rotates. Moreover, it is also possible to erect the blowing blades 100 on the bus bars 99u, 99v, 99w curved along the circumferential direction of the slip ring. 15 and 16, the cooling effect of the slip rings 97u, 97v, 97w and the brushes 98u, 98v, 98w can be further enhanced.

  In the present embodiment, the input shaft 34 and the output shaft 24 of the rotating electrical machine 10 can be interchanged, the second rotor 18 is mechanically connected to the input shaft 34, and the first rotor 28 is mechanically connected to the output shaft 24. It can also be linked. That is, the second rotor 18 may be mechanically connected to the engine 36 and the first rotor 28 may be mechanically connected to the wheels 38. In this case, the power from the engine 36 is transmitted to the second rotor 18 connected to the input shaft 34, and the power from the first rotor 28 connected to the output shaft 24 is transmitted to the wheels 38. The rotor 18 becomes an input side rotor, and the first rotor 28 becomes an output side rotor.

  The configuration of the present embodiment is also applicable to a rotating electrical machine in which the stator 16 is omitted and torque acts between the first rotor 28 and the second rotor 18 in which the rotor winding 30 is disposed. is there. The configuration of the present embodiment is also applicable to a rotating electrical machine in which the second rotor 18 is omitted and torque acts between the stator 16 and the first rotor 28 in which the rotor winding 30 is disposed. is there. The configuration of the present embodiment is also applicable to a rotating electrical machine in which a direct current flows through the rotor winding 30 via the slip ring 97 and the brush 98. In this case, the slip ring 97, the brush 98, and Two bus bars 99 are provided. As described above, the configuration of the present embodiment is applicable to a rotating electrical machine in which a rotor conductor is disposed in a rotor and a current flows through the rotor conductor via a slip ring and a brush.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to such embodiment at all, and it can implement with a various form in the range which does not deviate from the summary of this invention. Of course.

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machine, 16 Stator, 18 2nd rotor (output side rotor), 20 Stator winding, 24 Output shaft, 28 1st rotor (input side rotor), 30 Rotor winding, 32, 33 Permanent magnet, 34 Input shaft , 36 engine, 37 drive shaft, 38 wheels, 40, 41 inverter, 42 power storage device, 44 transmission, 48 clutch, 50 electronic control unit, 78u, 78v, 78w wiring hole, 79u, 79v, 79w electrical wiring, 80 Case housing, 84 Seal member, 90 Insulating member, 91u, 91v, 91w Ventilation path, 93 Rectifier, 94 Boost converter (DC-DC converter), 95 Slip ring module, 96 Brush module, 97u, 97v, 97w Slip ring, 98u , 98v, 98w brush, 99u, 99v, 99w bus bar, 100 air blowing blades, 110 cooling fins.

Claims (9)

A rotor attached to a rotating shaft and provided with a rotor conductor;
A slip ring module member having a slip ring attached to the rotary shaft and in electrical contact with the brush, and a bus bar for electrically connecting the slip ring and the rotor conductor;
With
A rotating electrical machine in which a bus blade is provided with a blowing blade for sending cooling air to at least one of a slip ring and a brush during rotation of a rotating shaft. A rotor attached to a rotating shaft and provided with a rotor conductor;
A slip ring module member having a slip ring attached to the rotary shaft and in electrical contact with the brush, and a bus bar for electrically connecting the slip ring and the rotor conductor;
With
A rotating electrical machine in which a bus bar is provided with cooling fins. The rotating electrical machine according to claim 2,
The cooling fin is a rotating electrical machine that is provided in the bus bar so as to be inclined in the rotational axis direction with respect to the slip ring circumferential direction. The rotating electrical machine according to claim 1 or 3,
In the slip ring module member, the slip ring is attached to the outer periphery of the insulating member attached to the rotating shaft, and the bus bar is exposed to the outside of the insulating member through the inside of the insulating member,
A rotating electrical machine in which a ventilation path facing a slip ring and a bus bar is formed in an insulating member. The rotating electrical machine according to claim 2,
The cooling fin is a rotating electrical machine provided on the bus bar along the circumferential direction of the slip ring. The rotating electrical machine according to any one of claims 1 to 5,
A rotating electrical machine in which the bus bar is curved along the circumferential direction of the slip ring. A rotor attached to a rotating shaft and provided with a rotor conductor;
A slip ring module member having a slip ring attached to the rotary shaft and in electrical contact with the brush, and a bus bar for electrically connecting the slip ring and the rotor conductor;
With
A rotating electrical machine in which the bus bar is curved along the circumferential direction of the slip ring. The rotating electrical machine according to claim 7,
In the slip ring module member, each of the plurality of bus bars is electrically connected to each of the plurality of slip rings,
A rotating electrical machine in which a plurality of bus bars are arranged at a minute interval that are electrically insulated from each other along the circumferential direction of the slip ring. The rotating electrical machine according to any one of claims 1 to 8,
A stator provided with a stator conductor capable of generating a rotating magnetic field when an alternating current flows;
The first rotor can be rotated relative to the first rotor, which is a rotor provided with the rotor conductor, and a rotating magnetic field generated by an alternating current flowing through the rotor conductor acts. A second rotor in which a torque acts between the stator and the stator in response to a rotating magnetic field generated in the stator conductor;
The rotating electrical machine further comprising:

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