JP5381839B2 - Power transmission device - Google Patents

Description

  The present invention relates to a power transmission device, and more particularly to a power transmission device capable of performing power transmission using electromagnetic coupling between rotors.

  The related art of this type of power transmission device 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 winding of the first rotor and the magnet of the second rotor. The shaft can be driven. Furthermore, the drive shaft can also be driven by generating power in the second rotor using the electric power supplied to the stator winding by electromagnetic coupling between the stator winding and the magnet of the second rotor. . In that case, the electric power generated in the winding of the first rotor using the power from the engine can be supplied to the winding of the stator via the first and second inverters.

  Thus, in Patent Document 1, as the power transmission path between the engine and the drive shaft, in addition to the first power transmission path via the first rotor and the second rotor, the winding of the first rotor A second power transmission path is provided via windings of the first and second inverters and the stator. In the first power transmission path, the power from the engine can be transmitted to the drive shaft by the torque acting between the first rotor and the second rotor. On the other hand, in the second power transmission path, electric power is generated in the winding of the first rotor using the power from the engine, and the winding of the stator is wound from the winding of the first rotor through the first and second inverters. It is possible to generate power in the second rotor using electric power supplied to the wire and transmit it to the drive shaft.

Japanese Patent No. 3543500 JP-A-5-3694 JP 2009-73472 A JP 2009-274536 A

  In Patent Document 1, due to the differential rotational speed between the first rotor and the second rotor, an induced electromotive force is generated in the winding of the first rotor and an induced current flows, whereby the first rotor and the first rotor Torque (electromagnetic coupling torque) is generated between the two rotors, and power can be transmitted through the first power transmission path. At this time, if the differential rotational speed between the first rotor and the second rotor increases, the induced electromotive force generated in the winding of the first rotor increases and the induced current also increases, and the first rotor and the second rotor increase. The electromagnetic coupling torque generated between the two increases. Therefore, the torque characteristic representing the relationship of the electromagnetic coupling torque with respect to the differential rotation speed has a characteristic that the electromagnetic coupling torque increases with an increase in the differential rotation speed.

  When the rate of change in the electromagnetic coupling torque with respect to the differential rotational speed has a large torque characteristic, it is possible to generate a large electromagnetic coupling torque with a small differential rotational speed, but to increase the differential rotational speed. It becomes difficult to widen the variable range of the gear ratio (the rotational speed of the first rotor / the rotational speed of the second rotor). On the other hand, if the rate of change of the electromagnetic coupling torque with respect to the differential rotational speed has a small torque characteristic, the differential rotational speed can be increased by increasing the differential rotational speed, but the differential rotational speed is As the power increases, the power generated in the winding of the first rotor increases, and the power transmitted through the second power transmission path also increases. In the second power transmission path, a power loss occurs during power conversion in the first and second inverters. Therefore, when the power transmitted through the second power transmission path increases, the power transmission efficiency Decreases. In Patent Document 1, since the torque characteristic is fixed to a predetermined characteristic determined by the characteristic of the winding of the first rotor, it is difficult to increase the variable range of the gear ratio and improve the power transmission efficiency. Become.

  An object of the present invention is to provide a power transmission device capable of realizing an increase in the variable range of the gear ratio and an improvement in power transmission efficiency.

  The power transmission device according to the present invention employs the following means in order to achieve the above-described object.

The power transmission device according to the present invention includes a first rotor provided with a rotor winding, a stator provided with a stator winding, a relative rotation with respect to the first rotor, and a magnet. And a power converter capable of performing power conversion between the rotor winding and the stator winding, the magnetic flux of the magnet, the first rotor, Torque acts between the first rotor and the second rotor due to the interaction with the alternating current flowing in the rotor winding due to the difference in rotational speed with the second rotor, and the magnetic flux of the magnet is fixed. Torque acts between the stator and the second rotor due to the interaction with the alternating current flowing through the child winding, and the power from the prime mover is transmitted to one of the first and second rotors. a power transmission system power is transmitted to the drive shaft from the other of the second rotor, for rotational speed difference between the first rotor and the second rotor Comprising a first rotor and a torque characteristic changing means for changing, based torque characteristics representing the relationship of the torque acting on the rotational speed of the drive shaft between the second rotor, the torque characteristic variable means, the torque characteristic, It is possible to selectively switch between the first torque characteristic and the second torque characteristic in which the rate of change of torque with respect to the rotational speed difference is larger than the first torque characteristic. And when one rotation speed of the first and second rotors is higher than the other rotation speed of the first and second rotors, the rotation speed of the drive shaft when selecting the second torque characteristic is It is higher than the rotational speed of the drive shaft when selecting the first torque characteristic. Further, when the rotation speed of the other of the first and second rotors is higher than the rotation speed of one of the first and second rotors, the rotation speed of the drive shaft when selecting the first torque characteristic is It is higher than the rotational speed of the drive shaft when the second torque characteristic is selected .

  In one aspect of the present invention, the torque characteristic variable means can selectively switch the torque characteristic to one of a first torque characteristic and a second torque characteristic that have different rates of change of the torque with respect to the rotational speed difference. Further, by changing the distribution of the selection period of the first torque characteristic and the selection period of the second torque characteristic when the selection of the first torque characteristic and the selection of the second torque characteristic are alternately switched, It is preferable to change the torque characteristic.

  In one aspect of the present invention, the torque characteristic varying means is configured such that when one rotation speed of the first and second rotors is higher than the other rotation speed of the first and second rotors, the rotation speed of the drive shaft. It is preferable to change the torque characteristic so that the rate of change of the torque with respect to the difference in rotational speed increases as the speed increases.

  In one aspect of the present invention, the torque characteristic varying means is configured such that when the other rotation speed of the first and second rotors is higher than the rotation speed of one of the first and second rotors, the rotation speed of the drive shaft. It is preferable to change the torque characteristic so that the rate of change of the torque with respect to the rotational speed difference becomes smaller as the rotation speed increases.

  In one aspect of the present invention, the rotor winding is a multi-phase winding, and the torque characteristic varying means can change the torque characteristic by changing the connection between the multi-phase rotor windings. Is preferred.

  In one aspect of the present invention, the rotor winding is a three-phase winding, and the torque characteristic varying means selectively switches the connection between the three-phase rotor windings to either a delta connection or a star connection. Thus, it is preferable to change the torque characteristic.

  In one aspect of the present invention, the torque characteristic varying means includes a first switch capable of conducting the three-phase rotor winding with the power conversion device in a state of being delta-connected through a slip ring and a brush. A second switch capable of conducting the three-phase rotor winding with the power conversion device in a star-connected state via a slip ring and a brush, and provided on the brush side; It is preferable to change the torque characteristic by selectively conducting either of the two switches.

  In one aspect of the present invention, the first rotor is provided with a plurality of sets of rotor windings, and the torque characteristic varying means is configured to rotate the power converter from among the plurality of sets of rotor windings. It is preferable to change the torque characteristics by selectively switching the child windings.

  In one aspect of the present invention, it is preferable that the plurality of sets of rotor windings are different from each other in at least one of the number of turns, the number of poles, and the thickness.

  In one aspect of the present invention, it is preferable that the torque characteristic varying means changes the torque characteristic by selectively switching the number of series connection of the rotor windings to be conducted with the power converter.

  In one aspect of the present invention, it is preferable that the torque characteristic variable means changes the torque characteristic by selectively switching the number of parallel connection of the rotor windings that are electrically connected to the power converter.

  In one aspect of the present invention, in the torque characteristic variable means, a switch for selectively switching a rotor winding to be electrically connected to a power converter through a slip ring and a brush from a plurality of sets of rotor windings. Is preferably provided on the brush side.

  In one aspect of the present invention, a power converter includes a first inverter capable of performing bidirectional power conversion between a power storage device and a rotor winding, and the power storage device and the stator winding. And a second inverter capable of performing bidirectional power conversion.

  In one aspect of the present invention, a power converter includes a rectifier capable of rectifying AC power generated in a rotor winding, and a DC-DC converter capable of converting voltage of DC power rectified by the rectifier. And an inverter capable of converting the DC power voltage-converted by the DC-DC converter into an AC voltage and supplying the AC power to the stator winding.

  According to the present invention, by changing the torque characteristic representing the relationship of the torque acting between the first rotor and the second rotor with respect to the rotational speed difference between the first rotor and the second rotor, The distribution between the power transmitted by the torque acting between the first rotor and the second rotor and the power transmitted via the power converter can be changed. As a result, it is possible to increase the variable range of the gear ratio and improve the power transmission efficiency.

It is a figure which shows schematic structure of a hybrid drive device provided with the power transmission device which concerns on embodiment of this invention. It is a figure which shows schematic structure of the power transmission device 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 power transmission device which concerns on embodiment of this invention. It is a figure explaining operation | movement of the power transmission device which concerns on embodiment of this invention. It is a figure explaining operation | movement of the power transmission device which concerns on embodiment of this invention. 4 is a diagram illustrating an example of a torque characteristic representing a relationship of torque acting between the input side rotor 28 and the output side rotor 18 with respect to a differential rotational speed between the input side rotor 28 and the output side rotor 18. FIG. It is a figure explaining operation | movement of the power transmission device which concerns on embodiment of this invention. 4 is a diagram illustrating an example of a torque characteristic representing a relationship of torque acting between the input side rotor 28 and the output side rotor 18 with respect to a differential rotational speed between the input side rotor 28 and the output side rotor 18. FIG. It is a figure which shows the other schematic structure of the power transmission device which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the power transmission device which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the power transmission device which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the power transmission device which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of the power transmission device 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 and 2 are diagrams showing an outline of a configuration of a hybrid drive device including a drive control device for a rotating electrical machine according to an embodiment of the present invention, FIG. 1 shows an overview of the overall configuration, and FIG. An outline of the configuration of The hybrid drive device according to the present embodiment includes an engine (internal combustion engine) 36 provided as a prime mover capable of generating power (mechanical power), a rotating electrical machine 10 provided between the engine 36 and wheels 38, Is 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 a stator case (not shown), a first rotor 28 that can rotate relative to the stator 16, a stator 16 and a first rotor 28 in a radial direction perpendicular to the rotor rotation axis, and a predetermined amount. The second rotor 18 is opposed to the stator 16 and the first rotor 28 with a gap. 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 mechanically connected to the input shaft 34 of the rotating electrical machine 10, and the input shaft 34 is mechanically connected to the engine 36, so that the first rotor 28 (input shaft 34) is connected to the engine 36. Power is transmitted. On the other hand, the second rotor 18 is mechanically connected to the output shaft 24 (drive shaft) of the rotating electrical machine 10, and the output shaft 24 is mechanically connected to the wheel 38, so that the wheel 38 (output shaft 24). ) Receives power from the second rotor 18. 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. 3, 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 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 slip ring module 95 is mechanically coupled to the input side rotor 28 and is electrically connected to each phase of the rotor winding 30. The brush module 96 whose rotation is fixed is pressed against the slip ring module 95 to make electrical contact. The slip ring module 95 rotates with the input-side rotor 28 while sliding relative to the brush module 96 (maintaining electrical contact with the brush module 96). 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 module 96 and the slip ring module 95. Furthermore, the inverter 41 can also perform power conversion in a direction in which an alternating current flowing in each phase of the rotor winding 30 is converted into a direct current. At that time, AC power of the rotor winding 30 is extracted by the slip ring module 95 and the brush module 96, and the extracted AC power is converted into DC by the inverter 41. The electric power converted into direct current by the inverter 41 can be supplied to each phase of the stator winding 20 after being converted into alternating current by the inverter 40. That is, the inverter 40 can convert either (at least one) of the DC power from the inverter 41 and the DC power from the power storage device 42 into AC and supply it to each phase of the stator winding 20. In addition, the power converted into direct current by the inverter 41 can be recovered by the power storage device 42. Thus, the inverter 41 can perform bidirectional power conversion between the power storage device 42 and the rotor winding 30. A power conversion device that includes the inverters 40 and 41 and can perform power conversion between the rotor winding 30 and the stator winding 20 can be configured. Further, the slip ring module 95 and the brush module 96 can constitute a power transmission unit for taking out the power (AC power) of the rotor winding 30.

  In the present embodiment, a switch module 92 for changing the connection between the rotor windings 30 of a plurality of phases is provided on the brush module 96 side (fixed side). By changing the conduction state of the switch module 92, it is possible to change the connection between the multiple-phase rotor windings 30 via the slip ring module 95 and the brush module 96.

  A more detailed configuration example of the switch module 92, the slip ring module 95, and the brush module 96 is shown in FIG. As shown in FIG. 4, in the example in which the rotor winding 30 is a three-phase winding of a u-phase rotor winding 30u, a v-phase rotor winding 30v, and a w-phase rotor winding 30w, the slip ring module 95 Slip ring 97-1u electrically connected to one end of phase rotor winding 30u, slip ring 97-1v electrically connected to one end of v phase rotor winding 30v, and w phase rotor winding 30w The slip ring 97-1w electrically connected to one end, the slip ring 97-2u electrically connected to the other end of the u-phase rotor winding 30u, and the other end of the v-phase rotor winding 30v are electrically connected And the slip ring 97-2w electrically connected to the other end of the w-phase rotor winding 30w. The brush module 96 includes a brush 98-1u that is pressed against and electrically contacted with the slip ring 97-1u, a brush 98-1v that is pressed against and electrically contacted with the slip ring 97-1v, and a slip ring 97-1w. Brush 98-1w pressed against and electrically in contact with, brush 98-2u pressed against and electrically in contact with slip ring 97-2u, and brush pressed against and electrically in contact with slip ring 97-2v 98-2v and a brush 98-2w that is pressed against and electrically contacts the slip ring 97-2w. The brushes 98-1u, 98-1v, 98-1w are electrically connected to the inverter 41.

  In the switch module 92, the switch 99-1 for electrically connecting the brush 98-1u and the inverter 41 and the brush 98-2w, and the brush 98-1v, the inverter 41 and the brush 98-2u are electrically connected. A switch 99-2 for conducting, and a switch 99-3 for electrically conducting the brush 98-1w and the inverter 41 and the brush 98-2v are provided on the brush side (fixed side). Further, the switch module 92 has one end electrically connected to the brush 98-2w and the switch 99-1, and one end electrically connected to the brush 98-2u and the switch 99-2. A switch 99-5 and a switch 99-6, one end of which is electrically connected to the brush 98-2v and the switch 99-3, are provided on the brush side (fixed side), and each switch 99-4, 99- The other ends of 5, 99-6 are electrically connected.

  Each switch 99-4, 99-5, 99-6 is turned off (non-conducting) and each switch 99-1, 99-2, 99-3 is turned on (conducting). As shown in FIG. 4, one end of the u-phase rotor winding 30u and the other end of the w-phase rotor winding 30w are electrically connected via slip rings 97-1u, 97-2w and brushes 98-1u, 98-2w. The one end of the v-phase rotor winding 30v and the other end of the u-phase rotor winding 30u are electrically connected via slip rings 97-1v, 97-2u and brushes 98-1v, 98-2u, and the w-phase rotor One end of winding 30w and the other end of v-phase rotor winding 30v are electrically connected via slip rings 97-1w, 97-2v and brushes 98-1w, 98-2v. As a result, the three-phase rotor windings 30u, 30v, 30w are connected to the slip rings 97-1u, 97-1v, 97-1w, 97-2u, 97-2v, 97-2w and the brushes 98-1u, 98-1v. , 98-1w, 98-2u, 98-2v, 98-2w, and can be electrically connected to the inverter 41 (power conversion device) in a state of Δ (delta) connection.

  On the other hand, by turning each switch 99-1, 99-2, 99-3 off (non-conducting) and turning on each switch 99-4, 99-5, 99-6 (conducting), As shown in FIG. 6, the other ends of the rotor windings 30u, 30v, 30w are electrically connected via slip rings 97-2u, 97-2v, 97-2w and brushes 98-2u, 98-2v, 98-2w. Connected. As a result, the three-phase rotor windings 30u, 30v, 30w are connected to the Y (star) via the slip rings 97-2u, 97-2v, 97-2w and the brushes 98-2u, 98-2v, 98-2w. In this state, it can be electrically connected to the inverter 41 (power converter). In this way, the three-phase rotor winding is obtained by selectively conducting one of each of the switches 99-1, 99-2, 99-3 and each of the switches 99-4, 99-5, 99-6. The connection between 30u, 30v, and 30w can be selectively switched to one of delta connection and star connection.

  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 alternating current flowing in each phase of the rotor winding 30 by controlling the switching operation of the switching element of the inverter 41. Then, the electronic control unit 50 selectively connects one of the switches 99-1, 99-2, 99-3 and each of the switches 99-4, 99-5, 99-6 to form a three-phase circuit. Control is performed to selectively switch the connection between the rotor windings 30u, 30v, and 30w to either the delta connection or the star connection. Further, the electronic control unit 50 also controls the operating state of the engine 36.

  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 stator circumferential direction. Then, torque (magnet torque) is applied to the output-side rotor 18 by electromagnetic interaction (attraction and repulsion) between the rotating magnetic field generated by the alternating current of the stator winding 20 and the field magnetic flux of the permanent magnet 32 flowing in the stator 16. The output side rotor 18 can be driven to rotate. 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. 3, 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 rotational speed 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 rotor 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 magnetic flux of the permanent magnet 33 flowing in the input-side rotor 28. 18 can be rotationally driven. 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 the torque (electromagnetic coupling torque) is generated 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 uses the switches 99-1, 99-2. , 99-3 and any one of the switches 99-4, 99-5, 99-6 are selectively turned on to allow the induction current to flow through the rotor winding 30 in an inverter 41. The switching operation is performed. At that time, the electronic control unit 50 controls the alternating current flowing through the rotor winding 30 by the switching operation of the inverter 41, so that the electromagnetic coupling torque acting between the input-side rotor 28 and the output-side rotor 18. Can be controlled. On the other hand, the electronic control unit 50 maintains the switching element of the inverter 41 in the OFF state and stops the switching operation, so that the induced current does not flow through the rotor winding 30, and the input side rotor 28 and the output side rotor 18 In the meantime, the torque stops working.

  Next, in the hybrid drive device according to the present embodiment, an operation for rotationally driving the wheel 38 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, an induced electromotive force is generated in the rotor winding 30. The electronic control unit 50 rotates the rotor winding in a state where one of the switches 99-1, 99-2, 99-3 and one of the switches 99-4, 99-5, 99-6 is selectively conducted. The switching operation of the inverter 41 is performed so as to allow the induced current to flow through 30. As a result, electromagnetic coupling torque in the engine rotation direction acts on the output side rotor 18 from the input side rotor 28 due to the electromagnetic interaction between the induction current of the rotor winding 30 and the field magnetic flux of the permanent magnet 33, and the output side rotor 18. Is driven to rotate 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 wheels 38 via the output shaft 24 (drive shaft), and is 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 module 95 and the brush module 96. The extracted AC power is converted into DC by the inverter 41. Then, by the switching operation of the inverter 40, the DC power from the inverter 41 is converted into AC by the inverter 40 and then supplied to the stator winding 20, whereby an AC current flows through the stator winding 20 and rotates to the stator 16. A magnetic field is formed. Torque in the engine rotation direction can be applied to the output side rotor 18 also by electromagnetic interaction between the rotating magnetic field of the stator 16 and the field magnetic 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 the inverter 41 in the power storage device 42.

  Thus, in the present embodiment, the first power transmission via the input-side rotor 28 and the output-side rotor 18 is used as a power transmission path between the engine 36 (input shaft 34) and the wheel 38 (output shaft 24). In addition to the path (transmission path by mechanical path), a second power transmission path (transmission path by electric path) is provided via the rotor winding 30, inverters 41 and 40 (power converter) and the stator winding 20. . In the first power transmission path, the power from the engine 36 can be transmitted to the wheels 38 (the output shaft 24) by electromagnetic coupling torque acting between the input side rotor 28 and the output side rotor 18. . On the other hand, in the second power transmission path, electric power is generated in the rotor winding 30 using the power from the engine 36 and supplied to the stator winding 20 from the rotor winding 30 via the inverters 41 and 40. It is possible to generate power in the output side rotor 18 using electric power and transmit it to the wheel 38 (output shaft 24).

  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.

  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 output shaft 24 (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 this embodiment, due to the differential rotational speed ΔN between the input-side rotor 28 and the output-side rotor 18, induced electromotive force is generated in the rotor windings 30 u, 30 v, 30 w and the induced current flows, so that the input An electromagnetic coupling torque T _coup is generated between the side rotor 28 and the output side rotor 18. At this time, when the differential rotational speed ΔN between the input side rotor 28 and the output side rotor 18 increases, the induced electromotive force generated in the rotor windings 30u, 30v, and 30w increases, and the induced current also increases. The electromagnetic coupling torque T _coup generated between the rotor 28 and the output side rotor 18 also increases. Therefore, the torque characteristic representing the relationship of the electromagnetic coupling torque T _coup with the differential rotational speed ΔN has a characteristic that the electromagnetic coupling torque T _coup increases with an increase in the differential rotational speed ΔN. Furthermore, when the connection between the three-phase rotor windings 30u, 30v, and 30w is a star connection, the line voltage of the rotor windings 30u, 30v, and 30w increases as compared to the case of the delta connection. For the same differential rotational speed ΔN, the induced electromotive force generated in the rotor windings 30u, 30v, 30w increases, and the electromagnetic coupling torque T _coup increases. Therefore, when the connection between the rotor windings 30u, 30v, and 30w is a delta connection, the torque characteristic is, for example, as shown in FIG. 7, the rate of change T _coup / the electromagnetic coupling torque T _coup with respect to the differential rotational speed ΔN. The torque characteristic when the connection between the rotor windings 30u, 30v, and 30w is a star connection, while the torque characteristic A is small, the electromagnetic characteristics with respect to the differential rotational speed ΔN as shown in FIG. The rate of change T _coup / ΔN of the coupling torque T _coup becomes a torque characteristic B greater than the torque characteristic A. Therefore, each of the switches 99-1, 99-2, 99-3 and one of the switches 99-4, 99-5, 99-6 is selectively conducted to provide three-phase rotor windings 30u, 30v. , 30w is selectively switched to one of delta connection and star connection, so that the torque characteristics are different from each other in the rate of change T _coup / ΔN of the electromagnetic coupling torque T _coup with respect to the differential rotational speed ΔN. It is possible to selectively switch to one of the characteristic A and the torque characteristic B.

When each switch 99-4, 99-5, 99-6 is turned off and each switch 99-1, 99-2, 99-3 is turned on to select the delta connection (torque characteristic A), Compared to the case where the star connection (torque characteristic B) is selected by turning off the switches 99-1, 99-2, 99-3 and turning on the switches 99-4, 99-5, 99-6. Then, as shown in FIG. 7, the differential rotational speed ΔN with respect to the same electromagnetic coupling torque T _coup increases (ΔN1 in the star connection, ΔN2 in the delta connection). Therefore, when the delta connection is selected, the AC power generated in the rotor winding 30 is larger for the same electromagnetic coupling torque T _coup (engine torque) than when the star connection is selected. The distribution of power transmitted through the second power transmission path (transmission path by electric path) is increased, and the distribution of power transmitted through the first power transmission path (transmission path by mechanical path) is decreased. Become.

Further, for example, as shown in FIG. 8, the switches 99-1, 99-2, 99-3 are turned on and the switches 99-4, 99-5, 99-6 are alternately turned on, thereby making a delta connection. When the selection of (torque characteristic A) and the selection of star connection (torque characteristic B) are alternately switched, the induced current flowing through the rotor winding 30 becomes larger than when the delta connection is selected, and the star connection is selected. Smaller than the case. Therefore, the torque characteristic when the selection of the delta connection and the selection of the star connection is alternately performed is such that the rate of change T _coup / ΔN of the electromagnetic coupling torque T _coup with respect to the differential rotational speed ΔN is, for example, as shown in FIG. The torque characteristic C is larger than the characteristic A (when delta connection is selected) and smaller than the torque characteristic B (when star connection is selected). Therefore, when the selection of the delta connection and the selection of the star connection are alternately switched, the distribution of the power transmitted through the first power transmission path is larger than that in the case of selecting the delta connection (second The distribution of power transmitted through the first power transmission path is smaller) and the distribution of power transmitted through the first power transmission path is smaller than in the case where the star connection is selected (the first distribution). Distribution of power transmitted through the power transmission path 2 is increased). When the selection of the delta connection (torque characteristic A) and the selection of the star connection (torque characteristic B) are alternately switched, the switching cycle t1 + t2 (see FIG. 8) is changed to the induced electromotive force generated in the rotor winding 30. It is set to be sufficiently shorter than the cycle (determined according to the differential rotational speed ΔN).

Further, the on-period ratio t1 / (t1 + t2) of each switch 99-1, 99-2, 99-3 is increased, and the on-period ratio t2 / (t of each switch 99-4, 99-5, 99-6 is set. When the distribution of the selection period of the delta connection (torque characteristic A) is increased by reducing t1 + t2) and the distribution of the selection period of the star connection (torque characteristic B) is decreased, the induced current flowing in the rotor winding 30 _Therefore , the rate of change T _coup / ΔN of the electromagnetic coupling torque T _coup with respect to the differential rotational speed ΔN becomes small. Thereby, the distribution of power transmitted through the first power transmission path is reduced. On the other hand, the ratio t1 / (t1 + t2) of the ON period of each switch 99-1, 99-2, 99-3 is reduced, and the ratio t2 / (ON period of each switch 99-4, 99-5, 99-6). When the distribution of the selection period of the delta connection (torque characteristic A) is reduced by increasing t1 + t2) and the distribution of the selection period of the star connection (torque characteristic B) is increased, the induced current flowing in the rotor winding 30 _Therefore , the rate of change T _coup / ΔN of the electromagnetic coupling torque T _coup with respect to the differential rotation speed ΔN increases. This increases the distribution of the power transmitted through the first power transmission path. Therefore, when the selection of the delta connection (torque characteristic A) and the selection of the star connection (torque characteristic B) are alternately switched, the selection period t1 of the delta connection (torque characteristic A) and the selection period of the star connection (torque characteristic B) By continuously changing the distribution of t2, the torque characteristic can be continuously changed between the torque characteristic A and the torque characteristic B.

As described above, in the present embodiment, by changing the conduction state of the switch module 92 and changing the connection between the rotor windings 30 of the plurality of phases, the relationship of the electromagnetic coupling torque T _coup with respect to the differential rotation speed ΔN. The torque characteristic representing can be changed. As a result, when power is transmitted from the engine 36 (input shaft 34) to the wheel 38 (output shaft 24), power transmitted via the first power transmission path (by the electromagnetic coupling torque T _coup ), The distribution of the power transmitted through the second power transmission path (the rotor winding 30, the inverters 41 and 40, and the stator winding 20) can be changed. The torque characteristics as shown in FIGS. 7 and 9 are not limited to the case where the rotational speed N _in of the input-side rotor 28 is higher than the rotational speed N _{out of} the output-side rotor 18, and the rotational speed N _out of the output-side rotor 18 is This is true even when the rotational speed N _in of the input side rotor 28 is higher.

When power is transmitted from the engine 36 (input shaft 34) to the wheel 38 (output shaft 24), when changing the torque characteristics, the continuity of the switch module 92 is determined based on the rotational speed of the wheel 38 (output shaft 24). It is preferable to change the torque characteristics by changing the state (connection between the rotor windings 30 of a plurality of phases). For example, when the rotational speed N _in of the input side rotor 28 (the engine 36) is higher than the rotational speed N _out of the output side rotor 18 (output shaft 24), when the rotational speed N _out of the output shaft 24 is lower than the set speed N1 The electronic control unit 50 controls the switches 99-1, 99-2, 99-3 to be turned on and the switches 99-4, 99-5, 99-6 to be turned off, so that the delta connection (torque characteristic A) Select. As a result, the gear ratio (N _in / N _out ) _in the rotating electrical machine 10 can be increased, and the torque amplification ratio can be increased by the torque applied from the stator 16 to the output side rotor 18 using the electric power of the rotor winding 30. Can be bigger. On the other hand, when the rotational speed N _in of the input side rotor 28 is higher than the rotational speed N _out of the output side rotor 18, the rotational speed N _out of the output shaft 24 is set speed N1 or more, each by the electronic control unit 50 The switches 99-1, 99-2, 99-3 are turned off and the switches 99-4, 99-5, 99-6 are turned on to select the star connection (torque characteristic B). As a result, the distribution of the power transmitted through the second power transmission path can be reduced, and the loss that occurs during power conversion by the inverters 41 and 40 (power conversion device) can be reduced. Power transmission efficiency can be improved. Thus, when the rotational speed of the input side rotor 28 is higher than the rotational speed of the output side rotor 18, the rotational speed N _out of the output shaft 24 when selecting star connection (torque characteristic B), delta connection (torque as becomes higher than the rotational speed N _out of the output shaft 24 when selecting the characteristics a), it is preferable to change the torque characteristics by changing the conduction state of the switch module 92 (connection of the rotor winding 30). When the rotational speed N _in of the input side rotor 28 is higher than the rotational speed N _out of the output side rotor 18, the inverter 41 uses the AC power of the rotor winding 30 extracted by the slip ring module 95 and the brush module 96. Power conversion in the direction of conversion to direct current is performed, and the power converted into direct current by the inverter 41 is converted again to alternating current by the inverter 40 and then supplied to the stator winding 20. That is, the power converter performs power conversion from the rotor winding 30 side to the stator winding 20 side.

Further, when the rotational speed N _in of the input-side rotor 28 is higher than the rotational speed N _out of the output-side rotor 18, the switches 99-1 and 99-2 correspond to the increase in the rotational speed N _out of the output-side rotor 18. , 99-3 and the switches 99-4, 99-5, 99-6 are alternately turned on, the ratio of the on period of the switches 99-4, 99-5, 99-6 t2 / ( t1 + t2) is gradually increased, that is, when the selection of the delta connection (torque characteristic A) and the selection of the star connection (torque characteristic B) are alternately switched, the distribution of the selection period of the star connection (torque characteristic B) is gradually increased. It can also be enlarged. As a result, the torque characteristic is changed so that the rate of change T _coup / ΔN of the electromagnetic coupling torque T _coup with respect to the differential rotation speed ΔN gradually increases as the rotation speed N _out of the output-side rotor 18 increases. Can do. Therefore, the speed change ratio (N _in / N _out ) _in the rotating electrical machine 10 is increased as the rotational speed N _out of the output-side rotor 18 decreases while maintaining the operating state (torque and rotational speed) in which the efficiency of the engine 36 increases. it is possible greatly to increase the torque amplification ratio, reducing the distribution of the power transmitted via the second power transmission path (inverter 41, 40) as the rotational speed N _out of the output side rotor 18 is higher Thus, power transmission efficiency can be improved.

Further, when the rotational speed N _out of the output side rotor 18 is higher than the rotational speed N _in of the input side rotor 28, when the rotational speed N _out of the output shaft 24 is set speed N2 (N2> N1) below, Star Select the connection (torque characteristic B). As a result, the power transmission efficiency can be improved by reducing the distribution of the power transmitted through the second power transmission path. On the other hand, when the rotational speed N _out of the output side rotor 18 is higher than the rotational speed N _in of the input side rotor 28, when the rotational speed N _out of the output shaft 24 is higher than the set speed N2 is delta-connected (torque characteristic A) Select. Thereby, the gear ratio (N _in / N _out ) _in the rotating electrical machine 10 can be reduced, and the wheel 38 (output shaft 24) can be driven to rotate at a higher rotational speed. Thus, when the rotational speed N _out of the output side rotor 18 is higher than the rotational speed N _in of the input side rotor 28, the rotational speed N _out of the output shaft 24 when selecting delta connection (torque characteristic A) is, it is preferable to change the high so as to torque characteristics than the rotational speed N _out of the output shaft 24 (connecting the rotor windings 30) when selecting a star connection (torque characteristic B). Incidentally, when the rotational speed N _out of the output side rotor 18 is higher than the rotational speed N _in of the input side rotor 28, the inverter 40 performs power conversion direction for converting AC power of the stator winding 20 into DC, an inverter The electric power converted into direct current in 40 is converted into alternating current again in the inverter 41, and then supplied to the rotor winding 30 through the slip ring module 95 and the brush module 96. That is, the power converter performs power conversion from the stator winding 20 side to the rotor winding 30 side.

Furthermore, when the rotational speed N _out of the output side rotor 18 is higher than the rotational speed N _in of the input side rotor 28, relative to the increase in the rotational speed N _out of the output side rotor 18, the selection of delta connection (torque characteristic A) When the selection of the star connection (torque characteristic B) is alternately switched, the distribution t1 / (t1 + t2) of the selection period of the delta connection (torque characteristic A) can be gradually increased. As a result, the torque characteristic is changed so that the rate of change T _coup / ΔN of the electromagnetic coupling torque T _coup with respect to the differential rotation speed ΔN gradually decreases as the rotation speed N _out of the output-side rotor 18 increases. Can do. Therefore, while maintaining the operating state in the engine efficiency 36 is increased (torque and rotational speed), the distribution of power which the rotational speed N _out of the output side rotor 18 is transmitted via the second power transmission path as lower it is possible to reduce to improve the power transmission efficiency, more the speed ratio (N _in / N _out) to be smaller wheel 38 in the rotary electric machine 10 as the rotational speed N _out is increased the output side rotor 18 It can be rotationally driven at a high rotational speed.

According to the present embodiment described above, the power is transmitted from the engine 36 to the wheel 38 by changing the rate of change T _coup / ΔN (torque characteristic) of the electromagnetic coupling torque T _coup with respect to the differential rotational speed ΔN. In addition, the power transmitted through the first power transmission path (by the electromagnetic coupling torque T _coup ) and the second power transmission path (the rotor winding 30, the inverters 41 and 40, and the stator winding 20). The distribution with the transmitted power can be changed. For example by selecting the torque characteristic A (delta) by decreasing the rate of change T _coup / .DELTA.N electromagnetic coupling torque T _coup for the differential rotational speed .DELTA.N, differential for the same electromagnetic coupling torque T _coup Since the rotational speed ΔN can be increased, the variable range of the gear ratio (N _in / N _out ) _in the rotating electrical machine 10 can be increased without providing a separate transmission. On the other hand, by selecting the torque characteristic B (star connection) and increasing the rate of change T _coup / ΔN of the electromagnetic coupling torque T _coup with respect to the differential rotational speed ΔN, the torque is transmitted via the second power transmission path. Therefore, the power transmission efficiency can be improved by reducing the power loss that occurs during the power conversion in the inverters 41 and 40. Therefore, according to the present embodiment, it is possible to realize an increase in the variable width of the gear ratio (N _in / N _out ) _in the rotating electrical machine 10 and an improvement in power transmission efficiency.

Furthermore, according to the present embodiment, when the selection of the delta connection (torque characteristic A) and the selection of the star connection (torque characteristic B) are alternately switched, the selection period t1 of the delta connection (torque characteristic A) and the star connection ( The rate of change T _coup / ΔN (torque characteristic) of the electromagnetic coupling torque T _coup with respect to the differential rotational speed ΔN is continuously changed by continuously changing the distribution of the torque characteristic B) with the selection period t2. Can do. As a result, when power is transmitted from the engine 36 to the wheels 38, the distribution of the power transmitted via the first power transmission path and the power transmitted via the second power transmission path is continuously performed. Can be changed. Accordingly, the rate of change T _coup / ΔN (torque characteristic) of the electromagnetic coupling torque T _coup with respect to the differential rotational speed ΔN is changed so as to maintain the operation state (torque and rotational speed) in which the efficiency of the engine 36 is increased. The power can be transmitted from the engine 36 to the wheel 38, and the efficiency of the entire apparatus can be further improved.

Patent Document 2 shows that the connection of a stator winding of a general synchronous motor is switched between a star connection and a delta connection in a low speed region and a high speed region. However, in the rotating electrical machine 10 including the input-side rotor 28, the output-side rotor 18, and the stator 16, the connection of the rotor winding 30 disposed on the input-side rotor 28 is changed to change the electromagnetic cup for the differential rotational speed ΔN. By changing the rate of change T _coup / ΔN (torque characteristic) of the ring torque T _coup , the power transmitted through the first power transmission path and the power transmitted through the second power transmission path There is no description or suggestion in Patent Document 2 about changing the distribution. Therefore, this embodiment is different from Patent Document 2 in configuration and purpose.

Next, another configuration example for changing the torque characteristic representing the relationship of the electromagnetic coupling torque T _{coup with} the differential rotation speed ΔN will be described.

  In the configuration example shown in FIG. 10, a plurality of sets (two sets in FIG. 10) of rotor windings 30-1 and 30-2 are arranged on the input-side rotor 28. The plurality of sets of rotor windings 30-1 and 30-2 have different numbers of turns (number of turns), and the number of turns of the rotor winding 30-2 is larger than the number of turns of the rotor winding 30-1. The rotor winding 30-1 is a three-phase winding including a u-phase rotor winding 30-1u, a v-phase rotor winding 30-1v, and a w-phase rotor winding 30-1w, and is star-connected. Similarly, the rotor winding 30-2 is a three-phase winding including a u-phase rotor winding 30-2u, a v-phase rotor winding 30-2v, and a w-phase rotor winding 30-2w, and is star-connected. Yes. The slip ring module 95 includes a slip ring 97-1u electrically connected to one end of the u-phase rotor winding 30-1u and a slip ring 97 electrically connected to one end of the v-phase rotor winding 30-1v. -1v, a slip ring 97-1w electrically connected to one end of the w-phase rotor winding 30-1w, and a slip ring 97-2u electrically connected to one end of the u-phase rotor winding 30-2u A slip ring 97-2v electrically connected to one end of the v-phase rotor winding 30-2v, a slip ring 97-2w electrically connected to one end of the w-phase rotor winding 30-2w, It is comprised including. The brush module 96 includes a brush 98-1u that is pressed against and electrically contacted with the slip ring 97-1u, a brush 98-1v that is pressed against and electrically contacted with the slip ring 97-1v, and a slip ring 97-1w. Brush 98-1w pressed against and electrically in contact with, brush 98-2u pressed against and electrically in contact with slip ring 97-2u, and brush pressed against and electrically in contact with slip ring 97-2v 98-2v and a brush 98-2w that is pressed against and electrically contacts the slip ring 97-2w.

  In the switch module 92, the switch 99-1 for electrically connecting the inverter 41 to one of the brush 98-1u and the brush 98-2u, and any one of the brush 98-1v and the brush 98-2v are used as the inverter 41. A switch 99-2 for electrically connecting one of them and a switch 99-3 for electrically connecting the inverter 41 to either the brush 98-1w or the brush 98-2w are fixed on the brush side (fixed). Side). The rotors 30-1u, 30-1v, 30 are electrically connected to the brushes 98-1u, 98-1v, 98-1w by the switches 99-1, 99-2, 99-3. -1w can be electrically connected to the inverter 41 via slip rings 97-1u, 97-1v, 97-1w and brushes 98-1u, 98-1v, 98-1w. On the other hand, the rotor windings 30-2u, 30-2v are electrically connected to the brushes 98-2u, 98-2v, 98-2w by the switches 99-1, 99-2, 99-3. , 30-2w can be electrically connected to the inverter 41 via slip rings 97-2u, 97-2v, 97-2w and brushes 98-2u, 98-2v, 98-2w. In this way, the rotors that are electrically connected to the inverter 41 (power converter) from among the plurality of sets of rotor windings 30-1 and 30-2 by the switches 99-1, 99-2, and 99-3. The windings can be selectively switched.

When the number of turns of the rotor winding 30-2 is larger than the number of turns of the rotor winding 30-1, the induced electromotive force generated in the rotor winding 30-2 with respect to the same differential rotation speed ΔN is generated in the rotor winding 30. It becomes higher than the induced electromotive force generated at -1. Therefore, when the rotor winding 30-2 is electrically connected to the inverter 41, the same differential rotational speed ΔN is obtained as compared with the case where the rotor winding 30-1 is electrically connected to the inverter 41. On the other hand, the induced current increases and the electromagnetic coupling torque T _coup increases. Accordingly, the torque characteristic when the rotor winding 30-1 is electrically connected to the inverter 41 is, for example, as shown in FIG. 7, the rate of change T _coup / T of the electromagnetic coupling torque T _coup with respect to the differential rotational speed ΔN. Whereas ΔN has a small torque characteristic A, the torque characteristic when the rotor winding 30-2 is electrically connected to the inverter 41 is, for example, as shown in FIG. The rate of change T _coup / ΔN of the coupling torque T _coup becomes a torque characteristic B greater than the torque characteristic A. Therefore, the rotor windings that are electrically connected to the inverter 41 (power converter) from among the plurality of sets of rotor windings 30-1 and 30-2 by the switches 99-1, 99-2, and 99-3. Can be selectively switched between torque characteristics A and torque characteristics B having different rates of change T _coup / ΔN of electromagnetic coupling torque T _coup with respect to differential rotational speed ΔN. You can switch to Further, the rotor winding 30-1 (torque characteristic A) can be selected and the rotor winding by alternately switching the rotor winding electrically connected to the inverter 41 by the switches 99-1, 99-2, 99-3. When the selection of the line 30-2 (torque characteristic B) is alternately switched, the selection period t1 of the rotor winding 30-1 (torque characteristic A) and the selection period t2 of the rotor winding 30-2 (torque characteristic B) By continuously changing the distribution of the torque characteristics, the torque characteristics can be continuously changed between the torque characteristics A and the torque characteristics B.

In the configuration example shown in FIG. 10, the number of poles of the plurality of sets of rotor windings 30-1 and 30-2 can be made different from each other. In an example in which the number of poles of the rotor winding 30-2 is larger than the number of poles of the rotor winding 30-1, the torque characteristic when the rotor winding 30-2 is electrically connected to the inverter 41 is the rotor winding 30. Compared with the torque characteristic when −1 is electrically connected to the inverter 41, the torque characteristic has a large change rate T _coup / ΔN of the electromagnetic coupling torque T _coup with respect to the differential rotational speed ΔN. Also, the thicknesses (cross-sectional areas) of the plurality of sets of rotor windings 30-1 and 30-2 can be made different from each other. In an example in which the thickness of the rotor winding 30-2 is larger than the thickness of the rotor winding 30-1, the torque characteristic when the rotor winding 30-2 is electrically connected to the inverter 41 is the rotor winding 30-. Compared with the torque characteristic when 1 is electrically connected to the inverter 41, the torque characteristic has a large rate of change T _coup / ΔN of the electromagnetic coupling torque T _coup with respect to the differential rotational speed ΔN. In this way, any one or more of the number of turns, the number of poles, and the thickness of the plurality of sets of rotor windings 30-1 and 30-2 can be made different from each other. Further, as shown in FIG. 11, a plurality of sets of rotor windings 30-1 and 30-2 can be delta-connected.

  In the configuration example shown in FIG. 12, a plurality of sets (two sets in FIG. 12) of rotor windings 30-1 and 30-2 arranged in the input-side rotor 28 are connected in series. The rotor winding 30-1 is a three-phase winding including a u-phase rotor winding 30-1u, a v-phase rotor winding 30-1v, and a w-phase rotor winding 30-1w. One end of 1u, one end of the v-phase rotor winding 30-1v, and one end of the w-phase rotor winding 30-1w are electrically connected to each other. Similarly, the rotor winding 30-2 is also connected to the u-phase rotor winding. A three-phase winding composed of a wire 30-2u, a v-phase rotor winding 30-2v, and a w-phase rotor winding 30-2w, and one end of the u-phase rotor winding 30-2u is connected to the u-phase rotor winding 30-1u The other end of the v-phase rotor winding 30-2v is electrically connected to the other end of the v-phase rotor winding 30-1v, and one end of the w-phase rotor winding 30-2w is The other end of the w-phase rotor winding 30-1w is electrically connected. The slip ring module 95 includes a slip ring 97-1u electrically connected to the other end of the u-phase rotor winding 30-1u and one end of the u-phase rotor winding 30-2u, and a v-phase rotor winding 30-1v. Slip ring 97-1v electrically connected to the other end of the coil and one end of the v-phase rotor winding 30-2v, the other end of the w-phase rotor winding 30-1w, and one end of the w-phase rotor winding 30-2w Slip ring 97-1w electrically connected to the other end, slip ring 97-2u electrically connected to the other end of the u-phase rotor winding 30-2u, and the other end of the v-phase rotor winding 30-2v And a slip ring 97-2v electrically connected to the other end of the w-phase rotor winding 30-2w and a slip ring 97-2w electrically connected to the other end of the w-phase rotor winding 30-2w. The configuration of the brush module 96 and the switch module 92 is the same as the configuration example shown in FIG.

  In the configuration example shown in FIG. 12, the inverters 41 are electrically connected to the brushes 98-1u, 98-1v, 98-1w by the switches 99-1, 99-2, 99-3, so that one set of rotors is provided. In a state where the windings 30-1u, 30-1v, 30-1w are star-connected through slip rings 97-1u, 97-1v, 97-1w and brushes 98-1u, 98-1v, 98-1w. It can be electrically connected to the inverter 41. On the other hand, the inverters 41 are electrically connected to the brushes 98-2u, 98-2v, 98-2w by the switches 99-1, 99-2, 99-3, so that two sets of rotor windings connected in series with each other. Both lines 30-1u, 30-1v, 30-1w and rotor windings 30-2u, 30-2v, 30-2w are connected to slip rings 97-2u, 97-2v, 97-2w and brush 98-2u, It can be electrically connected to the inverter 41 in a state of star connection via 98-2v and 98-2w. In this way, the number of rotor windings connected in series with the inverter 41 (power converter) can be selectively switched by the switches 99-1, 99-2, 99-3.

In the configuration example shown in FIG. 12, when two sets of rotor windings 30-1 and 30-2 connected in series with each other are electrically connected to the inverter 41, one set of rotor windings 30-1 are connected to the inverter. Compared with the case where it is electrically connected to 41, the induced electromotive force increases for the same differential rotational speed ΔN, and the electromagnetic coupling torque T _coup increases. Therefore, the torque characteristic when the pair of rotor windings 30-1 is electrically connected to the inverter 41 is, for example, the rate of change of the electromagnetic coupling torque T _coup with respect to the differential rotational speed ΔN as shown in FIG. While T _coup / ΔN is a small torque characteristic A, the torque characteristic when the two rotor windings 30-1 and 30-2 connected in series with each other are electrically connected to the inverter 41 is as follows: For example, as shown in FIG. 7, the rate of change T _coup / ΔN of the electromagnetic coupling torque T _coup with respect to the differential rotational speed ΔN becomes a torque characteristic B greater than the torque characteristic A. Therefore, the rotor windings that are electrically connected to the inverter 41 (power converter) from among the plurality of sets of rotor windings 30-1 and 30-2 by the switches 99-1, 99-2, and 99-3. The torque characteristics can be selected from the torque characteristics A and the torque characteristics B having different rates of change T _coup / ΔN of the electromagnetic coupling torque T _coup with respect to the differential rotational speed ΔN by selectively switching the number of serial connections of You can selectively switch to one. Furthermore, the number of rotor windings 30-1 that are electrically connected to the inverter 41 is alternately switched between 1 and 2 by the switches 99-1, 99-2, and 99-3, so that the rotor winding 30-1 is switched. When the selection of (torque characteristic A) and the selection of rotor windings 30-1 and 30-2 (torque characteristic B) are alternately switched, the selection period t1 of the rotor winding 30-1 (torque characteristic A) and the rotor winding The torque characteristic is continuously changed between the torque characteristic A and the torque characteristic B by continuously changing the distribution of the lines 30-1 and 30-2 (torque characteristic B) with the selection period t2. Can do.

  In the configuration example shown in FIG. 13, the rotor winding 30-1 is a three-phase winding composed of a u-phase rotor winding 30-1 u, a v-phase rotor winding 30-1 v and a w-phase rotor winding 30-1 w. It is star-connected. Similarly, the rotor winding 30-2 is also a three-phase winding including a u-phase rotor winding 30-2u, a v-phase rotor winding 30-2v, and a w-phase rotor winding 30-2w, and the u-phase rotor winding One end of the wire 30-2u is electrically connected to one end of the u-phase rotor winding 30-1u, and one end of the v-phase rotor winding 30-2v is electrically connected to one end of the v-phase rotor winding 30-1v. One end of the w-phase rotor winding 30-2w is electrically connected to one end of the w-phase rotor winding 30-1w. The slip ring module 95 includes a slip ring 97-1u electrically connected to one end of the u-phase rotor winding 30-1u and one end of the u-phase rotor winding 30-2u, and a v-phase rotor winding 30-1v. Slip ring 97-1v electrically connected to one end and one end of v-phase rotor winding 30-2v, one end of w-phase rotor winding 30-1w and one end of w-phase rotor winding 30-2w are electrically connected The slip ring 97-1w connected to the other end, the slip ring 97-2u electrically connected to the other end of the u-phase rotor winding 30-2u, and the other end of the v-phase rotor winding 30-2v electrically And a slip ring 97-2w electrically connected to the other end of the w-phase rotor winding 30-2w. The brush module 96 includes a brush 98-1u that is pressed against and electrically contacted with the slip ring 97-1u, a brush 98-1v that is pressed against and electrically contacted with the slip ring 97-1v, and a slip ring 97-1w. Brush 98-1w pressed against and electrically in contact with, brush 98-2u pressed against and electrically in contact with slip ring 97-2u, and brush pressed against and electrically in contact with slip ring 97-2v 98-2v and a brush 98-2w that is pressed against and electrically contacts the slip ring 97-2w.

  In the switch module 92, a switch 99 for electrically connecting (short-circuiting) the brushes 98-2u, 98-2v, and 98-2w to each other via a rectifier 91 including a diode bridge is provided on the brush side ( (On the fixed side). Of the two sets of rotor windings 30-1u, 30-1v, 30-1w and rotor windings 30-2u, 30-2v, 30-2w, by turning off the switch 99 (non-conducting) A set of rotor windings 30-1u, 30-1v, 30-1w is connected to an inverter 41 via slip rings 97-1u, 97-1v, 97-1w and brushes 98-1u, 98-1v, 98-1w. Can be electrically conducted. On the other hand, when the switch 99 is turned on (conducted), the rotor windings 30-2u, 30-2v, 30-2w become slip rings 97-2u, 97-2v, 97-2w and brushes 98-2u, 98. -2v, 98-2w, star-connected and connected in parallel to the rotor windings 30-1u, 30-1v, 30-1w, and two sets of rotor windings 30-1u, 30- connected in parallel to each other 1v, 30-1w and rotor windings 30-2u, 30-2v, 30-2w are connected to slip rings 97-1u, 97-1v, 97-1w and brushes 98-1u, 98-1v, 98-1w. It can be electrically connected to the inverter 41 via. Thus, the switch 99 can selectively switch the number of parallel connection of the rotor windings that are electrically connected to the inverter 41 (power conversion device).

In the configuration example shown in FIG. 13, when the two sets of rotor windings 30-1 and 30-2 connected in parallel with each other are electrically connected to the inverter 41, the set of rotor windings 30-1 is connected to the inverter. Compared with the case of being electrically connected to 41, the induced current decreases for the same differential rotational speed ΔN, and the electromagnetic coupling torque T _coup decreases. Therefore, the torque characteristics when the two rotor windings 30-1 and 30-2 connected in parallel with each other are electrically connected to the inverter 41 are, for example, as shown in FIG. _Whereas the rate of change T _coup / ΔN of the electromagnetic coupling torque T _coup becomes a small torque characteristic A, the torque characteristic when one set of rotor windings 30-1 is electrically connected to the inverter 41 is: For example, as shown in FIG. 7, the rate of change T _coup / ΔN of the electromagnetic coupling torque T _coup with respect to the differential rotational speed ΔN becomes a torque characteristic B greater than the torque characteristic A. Therefore, the number of parallel connection of the rotor windings that are electrically connected to the inverter 41 (power converter) from among the plurality of sets (two sets in FIG. 13) of the rotor windings 30-1 and 30-2 by the switch 99. Can be selectively switched between torque characteristics A and torque characteristics B having different rates of change T _coup / ΔN of electromagnetic coupling torque T _coup with respect to differential rotational speed ΔN. You can switch to Further, the rotor windings 30-1 and 30-2 (torque characteristics A) are selected by alternately switching the number of parallel connection of the rotor windings that are electrically connected to the inverter 41 by the switch 99 between 1 and 2. And the selection of the rotor winding 30-1 (torque characteristic B) alternately, the selection period t1 of the rotor windings 30-1 and 30-2 (torque characteristic A) and the rotor winding 30-1 (torque characteristic) The torque characteristic can be continuously changed between the torque characteristic A and the torque characteristic B by continuously changing the distribution of the selection period t2 in B).

  In the present embodiment, for example, as shown in FIG. 14, a rectifier 93 and a boost converter (DC-DC converter) 94 may be provided. The rectifier 93 rectifies AC power from the rotor winding 30 taken out by the slip ring module 95 and the brush module 96 and converts it into DC. Boost converter 94 can be realized by a known configuration including a switching element and a diode (rectifier element), and boosts (voltage converts) DC power rectified by rectifier 93 by the switching operation of the switching element and outputs the boosted voltage. 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. Further, the DC power boosted by the boost converter 94 can be recovered by the power storage device 42. In the configuration example shown in FIG. 13, a power conversion device that includes the rectifier 93, the boost converter 94, and the inverter 40 and can perform power conversion between the rotor winding 30 and the stator winding 20 can be configured. it can. Here, the rectifier 93 performs power conversion in only one direction from the slip ring module 95 side (rotor winding 30 side) to the boost converter 94 side. The boost converter 94 is connected to the power storage device 42 side (or from the rectifier 93 side). Power conversion is performed only in one direction to the 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.

In the configuration example shown in FIG. 14, when there is a rotational difference between the input-side rotor 28 and the output-side rotor 18, an induction current is allowed to flow through the rotor winding 30, and the input-side rotor 28 and In order to generate torque (electromagnetic coupling torque T _coup ) between the output side rotor 18 and the electronic control unit 50, the boost converter 94 increases the output voltage of the boost converter 94 to be higher than the voltage of the power storage device 42. The step-up ratio at 94 is controlled. 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. Therefore, an electromagnetic coupling torque T between the input-side rotor 28 and the output-side rotor 18. _coup works. Further, the electronic control unit 50 controls the electromagnetic coupling torque T _coup acting between the input side rotor 28 and the output side rotor 18 by controlling the boost ratio (voltage conversion ratio) in the boost converter 94. (See also Patent Documents 3 and 4). 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 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 Torque stops working with the rotor 18.

  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. Can also be linked together. 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.

  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, 30-1, 30-2 Rotor winding, 32 , 33 Permanent magnet, 34 Input shaft, 36 Engine, 38 Wheel, 40, 41 Inverter, 42 Power storage device, 50 Electronic control unit, 91, 93 Rectifier, 92 Switch module, 94 Boost converter (DC-DC converter), 95 Slip Ring module, 96 Brush module, 97-1u, 97-1v, 97-1w, 97-2u, 97-2v, 97-2w Slip ring, 98-1u, 98-1v, 98-1w, 98-2u, 98 -2v, 98-2w brush, 99, 99-1, 99-2, 99-3, 99-4, 99-5, 99-6 Switch.

Claims (16)

A first rotor provided with a rotor winding;
A stator provided with a stator winding;
A second rotor that is rotatable relative to the first rotor and in which a magnet is disposed;
A power converter capable of performing power conversion between the rotor winding and the stator winding; and
With
Due to the interaction between the magnetic flux of the magnet and the alternating current flowing through the rotor winding due to the difference in rotational speed between the first rotor and the second rotor, there is a gap between the first rotor and the second rotor. Torque acts,
Due to the interaction between the magnetic flux of the magnet and the alternating current flowing through the stator winding, a torque acts between the stator and the second rotor ,
A power transmission device in which power from a prime mover is transmitted to one of the first and second rotors, and power is transmitted from the other of the first and second rotors to a drive shaft ,
Torque characteristics that change the torque characteristics representing the relationship of torque acting between the first rotor and the second rotor with respect to the rotational speed difference between the first rotor and the second rotor based on the rotational speed of the drive shaft. With variable means ,
The torque characteristic variable means can selectively switch the torque characteristic to any one of a first torque characteristic and a second torque characteristic having a torque change rate with respect to a rotational speed difference larger than the first torque characteristic.
When the rotational speed of one of the first and second rotors is higher than the rotational speed of the other of the first and second rotors, the rotational speed of the drive shaft when selecting the second torque characteristic is the first A power transmission device that is higher than the rotational speed of the drive shaft when selecting torque characteristics . The power transmission device according to claim 1,
When the rotation speed of the other of the first and second rotors is higher than the rotation speed of one of the first and second rotors, the rotation speed of the drive shaft when selecting the first torque characteristic is the second A power transmission device that is higher than the rotational speed of the drive shaft when selecting torque characteristics . A first rotor provided with a rotor winding;
A stator provided with a stator winding;
A second rotor that is rotatable relative to the first rotor and in which a magnet is disposed;
A power converter capable of performing power conversion between the rotor winding and the stator winding; and
With
Due to the interaction between the magnetic flux of the magnet and the alternating current flowing through the rotor winding due to the difference in rotational speed between the first rotor and the second rotor, there is a gap between the first rotor and the second rotor. Torque acts,
Due to the interaction between the magnetic flux of the magnet and the alternating current flowing through the stator winding, a torque acts between the stator and the second rotor,
A power transmission device in which power from a prime mover is transmitted to one of the first and second rotors, and power is transmitted from the other of the first and second rotors to a drive shaft ,
Torque characteristics that change the torque characteristics representing the relationship of torque acting between the first rotor and the second rotor with respect to the rotational speed difference between the first rotor and the second rotor based on the rotational speed of the drive shaft. With variable means,
The torque characteristic variable means can selectively switch the torque characteristic to any one of a first torque characteristic and a second torque characteristic having a torque change rate with respect to a rotational speed difference larger than the first torque characteristic.
When the rotation speed of the other of the first and second rotors is higher than the rotation speed of one of the first and second rotors, the rotation speed of the drive shaft when selecting the first torque characteristic is the second A power transmission device that is higher than the rotational speed of the drive shaft when selecting torque characteristics . The power transmission device according to any one of claims 1 to 3 ,
The torque characteristic variable means changes the distribution of the selection period of the first torque characteristic and the selection period of the second torque characteristic when the selection of the first torque characteristic and the selection of the second torque characteristic are alternately switched , A power transmission device that changes the torque characteristics. The power transmission device according to any one of claims 1 to 4 ,
When the rotational speed of one of the first and second rotors is higher than the rotational speed of the other of the first and second rotors, the torque characteristic variable means is configured to increase the rotational speed of the drive shaft. A power transmission device that changes the torque characteristics so that a rate of change of the torque with respect to a rotational speed difference is increased . The power transmission device according to any one of claims 1 to 5 ,
Torque characteristic changing means, if the other rotational speed before Symbol first and second rotor is higher than one of the rotational speed of the first and second rotors, with respect to the increase of the rotational speed of the drive shaft, A power transmission device that changes the torque characteristics such that a rate of change of the torque with respect to the rotational speed difference is small . The power transmission device according to any one of claims 1 to 6 ,
The rotor winding is a multi-phase winding,
The torque characteristic variable means is a power transmission device that changes the torque characteristic by changing the connection between the rotor windings of a plurality of phases . The power transmission device according to claim 7 ,
The rotor winding is a three-phase winding,
The torque characteristic variable means is a power transmission device that changes the torque characteristic by selectively switching the connection between the three- phase rotor windings to either a delta connection or a star connection . The power transmission device according to claim 8,
In the torque characteristic variable means,
A first switch capable of conducting a three-phase rotor winding with a power converter in a delta connection state via a slip ring and a brush;
A second switch capable of conducting a three-phase rotor winding with a power converter in a star connection state via a slip ring and a brush;
Is provided on the brush side,
A power transmission device that changes the torque characteristic by selectively conducting either the first switch or the second switch . The power transmission device according to any one of claims 1 to 6 ,
The first rotor is provided with a plurality of sets of rotor windings,
The torque characteristic variable means is a power transmission device that changes the torque characteristic by selectively switching a rotor winding to be electrically connected to a power converter from a plurality of sets of rotor windings . The power transmission device according to claim 10 ,
The plurality of sets of rotor windings are different from each other in any one or more of the number of turns, the number of poles, and the thickness . The power transmission device according to claim 10 ,
The torque characteristic variable means is a power transmission device that changes the torque characteristic by selectively switching the number of series connection of the rotor windings that are electrically connected to the power converter . The power transmission device according to claim 10 ,
The torque characteristic variable means is a power transmission apparatus that changes the torque characteristic by selectively switching the number of parallel connection of the rotor windings that are electrically connected to the power converter. The power transmission device according to any one of claims 10 to 13 ,
In torque characteristic changing means, from among a plurality of sets of rotor windings, a switch for switching the rotor winding for conducting the power converter through the slip rings and brushes selectively is provided on the brush side The power transmission device. It is a power transmission device of any one of Claims 1-14, Comprising:
The power converter is
A first inverter capable of bidirectional power conversion between the power storage device and the rotor winding;
A second inverter capable of bidirectional power conversion between the power storage device and the stator winding;
Including a power transmission device. The power transmission device according to any one of claims 1 to 14 ,
The power converter is
A rectifier capable of rectifying AC power generated in the rotor winding; and
A DC-DC converter capable of converting the DC power rectified by the rectifier into a voltage;
An inverter capable of converting the direct current power converted by the DC-DC converter into alternating current and supplying it to the stator winding ;
Including a power transmission device.

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