JP4946698B2 - Power transmission device - Google Patents

Description

  The present invention relates to a power transmission device, and in particular, it is possible to drive a load by transmitting power from a prime mover to a load using electromagnetic coupling between rotors, and further to power to a stator conductor. The present invention relates to a power transmission device capable of driving a load by supply.

  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 a magnet is disposed and mechanically coupled to a drive wheel, and a winding that is electromagnetically coupled to the magnet of the first rotor, and is disposed in an engine (prime mover). A mechanically coupled second rotor, a stator having a winding electromagnetically coupled to the magnet of the first rotor, and a winding electrically connected to the winding of the second rotor And a transformer rotor mechanically coupled to the second rotor, and a transformer stator in which windings electromagnetically coupled to the windings of the transformer rotor are disposed. In Patent Document 1, the power from the engine transmitted to the second rotor is transmitted to the first rotor by electromagnetic coupling between the winding of the second rotor and the magnet of the first rotor. The wheel can be driven. Further, the electric power supplied from the battery to the winding of the transformer stator via the inverter is supplied to the winding of the transformer rotor and the winding of the second rotor by electromagnetic coupling between the winding of the transformer stator and the winding of the transformer rotor. Therefore, the rotational speed of the drive wheels can be controlled by controlling the power supply to the windings of the transformer stator. In addition, electromagnetic coupling between the stator winding and the first rotor magnet causes the first rotor to generate power using the electric power supplied from the battery to the stator winding via the inverter to drive the drive wheels. Therefore, the torque transmitted to the drive wheels can be controlled by controlling the power supply to the stator windings.

Japanese Patent No. 30675594 Japanese Patent Laid-Open No. 2007-116837

  In Patent Document 1, the winding axis of the winding of the transformer rotor and the winding axis of the winding of the transformer stator are both parallel to the rotor rotation axis direction, and the diameter is the direction in which the transformer rotor and the transformer stator face each other. It is orthogonal to the direction. Therefore, the transformer rotor and the transformer stator simply function as a transformer, and no torque is generated between the transformer rotor and the transformer stator. Therefore, the torque generated by the engine cannot be received by the transformer rotor and the transformer stator, and needs to be received only by the torque generated between the first rotor and the second rotor. As a result, the torque transmission capacity is reduced.

  The present invention can drive the load by transmitting the power from the prime mover to the load using electromagnetic coupling between the rotors, and can also drive the load by supplying power to the stator conductor. An object of the present invention is to improve a torque transmission capacity in a power transmission device capable of achieving the above.

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

A power transmission device according to the present invention includes a first rotor provided with a first rotor conductor capable of generating a rotating magnetic field, and a second rotor coupled to the first rotor, wherein the first rotor A second rotor connected to the child conductor and provided with a second rotor conductor capable of generating a rotating magnetic field; a first stator provided with a first stator conductor capable of generating a rotating magnetic field; A third rotor capable of rotating relative to the first and second rotors, wherein torque acts between the first rotor and the first rotor in response to a rotating magnetic field generated by the first rotor conductor. In response to the generation of a rotating magnetic field in the second rotor conductor and the third rotor in which torque acts between the first stator and the rotating magnetic field generated in the first stator conductor A second stator having a second stator conductor through which an induced current flows, and is generated by the induced current and the second rotor conductor A second stator capable of applying a torque to the second rotor by interaction with the rotating magnetic field, and the power from the prime mover is applied to one of the first and second rotors and the third rotor. As well as being transmitted, power is transmitted from the other of the first and second rotors and the third rotor to the load, and the first and second rotor conductors are located between the first rotor and the third rotor. rotational difference is generated a rotating magnetic field by induced current flows according to a generated, der power can be supplied from the second stationary element conductor to the first stationary element conductor is, first rotor conductor and the The first rotor conductor and the second rotor conductor so that the rotating directions of the rotating magnetic field generated when the induced current flows through the two rotor conductors are the same in the first rotor conductor and the second rotor conductor. And the number of poles of the second rotor is greater than or equal to the number of poles of the first rotor .

In one aspect of the present invention, it is preferable that the number of poles of the second rotor is equal to the number of poles of the first rotor. Furthermore, in this aspect, it is preferable that a phase adjustment circuit is provided between the second stator conductor and the first stator conductor.

  In one aspect of the present invention, a rectifier that rectifies AC power from the second stator conductor is provided, and the power rectified by the rectifier is converted to AC by the first inverter and supplied to the first stator conductor. Is preferable.

  In one aspect of the present invention, it is preferable that power can be supplied from the power source to the second stator conductor. In this aspect, it is preferable that the power source is a DC power source, and DC power from the DC power source is converted into AC by the second inverter and supplied to the second stator conductor.

  In one aspect of the invention, the first rotor is disposed as a first rotor conductor in the first rotor, and the second rotor winding is disposed as a second rotor conductor in the second rotor. It is preferable to be provided. In this aspect, the second stator is provided with a stator winding as a second stator conductor, and the winding axis of the second rotor winding and the winding axis of the stator winding are the second stator. It is preferable that they coincide with the facing direction of the rotor and the second stator.

  In one aspect of the present invention, the first rotor is provided with a first cage conductor as the first rotor conductor, and the second rotor is provided with a second cage conductor as the second rotor conductor. It is suitable.

  In one aspect of the present invention, the third rotor is provided with a magnet that generates a field flux, and the first rotor and the magnet are caused by the interaction between the field flux and the rotating magnetic field generated by the first rotor conductor. It is preferable that a torque acts between the third rotor and the third rotor. In one aspect of the present invention, the third rotor is provided with a magnet for generating a field magnetic flux, and the first fixed by the interaction between the field magnetic flux and the rotating magnetic field generated by the first stator conductor. It is preferable that a torque acts between the child and the third rotor.

  In one aspect of the present invention, it is preferable to include an engagement device capable of mechanically engaging the first and second rotors with the third rotor.

  According to the present invention, torque is applied between the first rotor and the third rotor, between the first stator and the third rotor, and between the second stator and the second rotor. Thus, the torque transmission capacity can be improved.

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

  1-4 is a figure which shows the outline of a structure of the hybrid drive device provided with the power transmission device which concerns on embodiment of this invention, FIG. 1 shows the outline of the whole structure, FIGS. The outline of a structure is shown. 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 transmission 44 provided between the engine 36 and wheels 38, And the rotating electrical machine 10 provided between the engine 36 and the transmission 44. 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 first stator (first stator) 16 fixed to a casing (not shown), and a first rotor (first stator) that is disposed radially inward of the first stator 16 and is rotatable relative to the first stator 16. 1 rotor) 28, a second stator (second stator) 66 fixed to a casing (not shown), and a second rotor that is disposed on the radially inner side of the second stator 66 and is rotatable relative to the second stator 66. (Second rotor) 78 and a third rotor (third rotor) 18 that is disposed between the first stator 16 and the first rotor 28 and is rotatable relative to the first stator 16 and the first rotor 28. Have. The second rotor 78 is mechanically coupled to the first rotor 28 via the rotation shaft 48. The first rotor 28 and the second rotor 78 are 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, and thus the first rotor 28 and the second rotor 78. Power from the engine 36 is transmitted to. On the other hand, the third rotor 18 is mechanically connected to the output shaft 24 of the rotating electrical machine 10, and the output shaft 24 is mechanically connected to the wheel 38 via the transmission 44, so that the wheel 38 has Power from the third rotor 18 is transmitted.

  The first stator 16 includes a stator core (first stator core) 51 and a plurality of (for example, three-phase) first stator windings (first stator conductors) disposed on the stator core 51 along the circumferential direction thereof. 20 and. When a plurality of phases (for example, three phases) of alternating current flows through the first stator winding 20 having a plurality of phases, the first stator winding 20 can generate a rotating magnetic field that rotates in the circumferential direction of the first stator. Similarly, the second stator 66 includes a stator core (second stator core) 101 and a plurality of (for example, three-phase) second stator windings (second fixed) disposed on the stator core 101 along the circumferential direction thereof. Child conductor) 70. When a plurality of phases (for example, three phases) of alternating current flows through the second stator winding 70 having a plurality of phases, the second stator winding 70 can generate a rotating magnetic field that rotates in the circumferential direction of the second stator.

  The first rotor 28 includes a rotor core (first rotor core) 52 and a plurality of (for example, three phases) first rotor windings (first rotor conductors) disposed on the rotor core 52 along the circumferential direction thereof. 30. When a plurality of phases (for example, three phases) of alternating current flows through the first rotor winding 30 having a plurality of phases, the first rotor winding 30 can generate a rotating magnetic field that rotates in the circumferential direction of the first rotor. Similarly, the second rotor 78 includes a rotor core (second rotor core) 102 and a plurality of (for example, three phases) second rotor windings (second rotation) disposed on the rotor core 102 along the circumferential direction thereof. Child conductor) 80. The second rotor winding 80 can generate a rotating magnetic field that rotates in the circumferential direction of the second rotor when a plurality of phases (for example, three phases) of alternating current flows through the second rotor winding 80 of the plurality of phases.

  The second rotor winding 80 is electrically connected (directly connected) to the first rotor winding 30. Here, the rotation direction of the rotating magnetic field generated when an alternating current flows through the first rotor winding 30 and the second rotor winding 80 is the same in the first rotor winding 30 and the second rotor winding 80. Thus, the first rotor winding 30 and the second rotor winding 80 are connected in phase. For example, when both the first rotor winding 30 and the second rotor winding 80 are constituted by three-phase windings of U phase, V phase, and W phase, as shown in FIG. Are connected to the U phase of the second rotor winding 80, the V phase of the first rotor winding 30 is connected to the V phase of the second rotor winding 80, and the W of the first rotor winding 30 is connected. It is generated by the first rotor winding 30 and the second rotor winding 80 by connecting the phase and the W phase of the second rotor winding 80 (connecting windings of the same phase for all phases). The rotation directions of the magnetic field are the same.

  The third rotor 18 includes a rotor core (third rotor core) 53 and permanent magnets 32 and 33 that are disposed along the circumferential direction of the rotor core 53 and generate a field magnetic flux. The permanent magnet 32 is disposed on the outer periphery of the rotor core 53 so as to face the first stator 16 (stator core 51), and the permanent magnet 33 is disposed on the inner periphery of the rotor core 53 with the first rotor 28 (rotor core 52). Opposed to each other. Here, the permanent magnets 32 and 33 can also be integrated.

  A more detailed configuration example of the first rotor 28, the third rotor 18, and the first stator 16 is shown in FIG. 6, and a more detailed configuration example of the second rotor 78 and the second stator 66 is shown in FIG. In the example shown in FIG. 6, the first rotor 28, the third rotor 18, and the first stator 16 are arranged concentrically. In the stator core 51 of the first stator 16, a plurality of teeth 51a protruding radially inward (on the third rotor 18 side) are arranged at intervals along the circumferential direction of the first stator. A magnetic pole is comprised by the wire 20 being wound around these teeth 51a. In the rotor core 52 of the first rotor 28, a plurality of teeth 52a projecting radially outward (on the third rotor 18 side) are arranged at intervals along the circumferential direction of the first rotor. A magnetic pole is formed by winding the wire 30 around these teeth 52a. The teeth 51a of the first stator 16 and the permanent magnets 32 of the third rotor 18 are arranged to face each other in the radial direction perpendicular to the rotation center axis of the third rotor 18 (which coincides with the rotation center axis of the first rotor 28). The teeth 52a of the first rotor 28 and the permanent magnets 33 of the third rotor 18 are arranged to face each other in the radial direction. The winding axis of the first stator winding 20 and the winding axis of the first rotor winding 30 coincide with this radial direction (the direction in which the first rotor 28 and the third rotor 18 face each other). The permanent magnets 32 and 33 are arranged at intervals in the circumferential direction of the third 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 third rotor 18 or may be embedded in the third rotor 18 (in the rotor core 53). .

  In the example shown in FIG. 7, the second rotor 78 and the second stator 66 are arranged concentrically. In the stator core 101 of the second stator 66, a plurality of teeth 101a protruding radially inward (on the second rotor 78 side) are arranged at intervals along the circumferential direction of the second stator. A magnetic pole is formed by winding the wire 70 around these teeth 101a. On the rotor core 102 of the second rotor 78, a plurality of teeth 102a protruding outward in the radial direction (on the second stator 66 side) are arranged at intervals along the circumferential direction of the second rotor. The magnetic pole is comprised by the wire 80 being wound around these teeth 102a. The number of poles of the second rotor 78 is equal to the number of poles of the first rotor 28. The teeth 101a of the second stator 66 and the teeth 102a of the second rotor 78 are arranged to face each other in the radial direction perpendicular to the rotation center axis of the second rotor 78, and the winding axis of the second stator winding 70 and the second The winding axis of the rotor winding 80 coincides with this radial direction (the direction in which the second stator 66 and the second rotor 78 face each other).

  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 includes a switching element (not shown), and converts DC power from the power storage device 42 into alternating current (for example, three-phase alternating current) by the switching operation of the switching element, so that the first stator winding 20 and the first The two stator windings 70 can be supplied to each phase. A power line for electrically connecting the second stator winding 70 and the first stator winding 20, more specifically, the second stator winding 70, the first stator winding 20, and the inverter 40. Is provided with a phase adjustment circuit 43.

  When a plurality of phases (for example, three phases) of alternating current flows through the first stator winding 20 having a plurality of phases, the first stator winding 20 generates a rotating magnetic field that rotates in the circumferential direction of the first stator. Then, torque (magnet torque) can be applied to the third rotor 18 by electromagnetic interaction (attraction and repulsion) between the rotating magnetic field generated in the first stator winding 20 and the field magnetic flux generated in the permanent magnet 32. The third rotor 18 can be rotationally driven. That is, the electric power supplied from the power storage device 42 to the first stator winding 20 can be converted into the power (mechanical power) of the third rotor 18. Further, the inverter 40 can also convert the alternating current flowing in each phase of the first stator winding 20 into a direct current and convert the electric energy to be regenerated to the power storage device 42. In that case, the motive power of the third rotor 18 is converted into the electric power of the first stator winding 20 and recovered by the power storage device 42. In this way, the first stator winding 20 of the first stator 16 and the permanent magnet 32 of the third rotor 18 are electromagnetically coupled, so that the rotating magnetic field generated in the first stator winding 20 is third. By acting on the rotor 18, torque (magnet torque) can be applied between the first stator 16 and the third rotor 18. Further, for example, as shown in FIG. 6, an example in which a magnetic material (ferromagnetic material) is disposed as a salient pole portion between the permanent magnets 32 so as to face the first stator 16 (the teeth 51 a), or the permanent magnet 32 is provided. In the example embedded in the third rotor 18 (in the rotor core 53), in addition to the magnet torque, the reluctance torque is also the first in response to the rotating magnetic field generated by the first stator 16 acting on the third rotor 18. It acts between the stator 16 and the third rotor 18. The inverter 40 can perform bidirectional power conversion, and the power storage device 42 can transmit and receive power to and from the first stator winding 20.

  Further, the first and second rotors 28 and 78 rotate relative to the third rotor 18 so that a rotation difference is generated between the first rotor 28 (first rotor winding 30) and the third rotor 18 (permanent magnet 33). As a result, an induced electromotive force is generated in the first rotor winding 30 and an induced current flows to generate a rotating magnetic field. The torque can be applied to the third rotor 18 by the electromagnetic interaction between the rotating magnetic field generated by the induced current of the first rotor winding 30 and the field flux of the permanent magnet 33, and the third rotor 18 is driven to rotate. can do. As described above, the first rotor winding 30 of the first rotor 28 and the permanent magnet 33 of the third rotor 18 are electromagnetically coupled, so that the rotating magnetic field generated in the first rotor winding 30 is third. In response to acting on the rotor 18, torque (magnet torque) acts between the first rotor 28 and the third rotor 18. Therefore, power (mechanical power) can be transmitted between the first rotor 28 and the third rotor 18, and an electromagnetic coupling function can be realized. Further, an example in which a magnetic material (ferromagnetic material) is disposed as a salient pole portion between the permanent magnets 33 so as to face the first rotor 28 (the teeth 52a), or the permanent magnet 33 is disposed in the third rotor 18 (the rotor core 53). In the example embedded in the inner rotor, in accordance with the rotating magnetic field generated by the first rotor 28 acting on the third rotor 18, the reluctance torque in addition to the magnet torque is applied to the first rotor 28 and the third rotor 18. Acts during.

  Further, since the first rotor winding 30 is electrically connected to the second rotor winding 80, the first rotor winding 30 is generated in the first rotor winding 30 due to the rotational difference between the first rotor 28 and the third rotor 18. The induced current also flows in the second rotor winding 80, and a rotating magnetic field is also formed in the second rotor 78 by the induced current flowing in the second rotor winding 80. Then, in response to the rotating magnetic field generated in the second rotor winding 80 acting on the second stator 66, an induced electromotive force is generated in the second stator winding 70 and an induced current flows. The induced electromotive force (alternating voltage) generated in the second stator winding 70 is supplied to the first stator winding 20 after the phase is adjusted by the phase adjustment circuit 43. In the first stator 16, the second stator winding The third rotor 18 can be rotationally driven by generating a rotating magnetic field using AC power supplied from 70 to the first stator winding 20. Further, torque acts between the second stator 66 and the second rotor 78 due to electromagnetic interaction between the rotating magnetic field generated in the second rotor winding 80 and the induced current flowing in the second stator winding 70. As described above, the second rotor winding 80 of the second rotor 78 and the second stator winding 70 of the second stator 66 are electromagnetically coupled to each other, so that the alternating current generated in the second rotor winding 80 is generated. A non-contact power feeding function for transmitting electric power to the second stator winding 70 in a non-contact manner can be realized. Further, the second rotor 78 and the second stator 66 can function as an induction machine.

  The clutch 48 selectively performs mechanical engagement between the input shaft 34 (first and second rotors 28 and 78) and the output shaft 24 (third rotor 18) and release thereof by engagement / release thereof. Is possible. By engaging the clutch 48 and mechanically engaging the first and second rotors 28 and 78 and the third rotor 18, the first and second rotors 28 and 78 and the third rotor 18 are integrated. And rotate at the same rotation speed. On the other hand, by releasing the clutch 48 and releasing the mechanical engagement between the first and second rotors 28 and 78 and the third rotor 18, the first and second rotors 28 and 78 and the third rotor 18 The difference in rotational speed is allowed. Here, the clutch 48 can be switched between engagement and disengagement using, for example, hydraulic pressure or electromagnetic force. Further, by adjusting the hydraulic pressure or electromagnetic force supplied to the clutch 48, The fastening force can also be adjusted.

  The electronic control unit 50 controls the alternating current flowing through each phase of the first stator winding 20 by controlling the switching operation of the switching element of the inverter 40. The electronic control unit 50 also controls the operating state of the engine 36 and the speed ratio of the transmission 14. Further, the electronic control unit 50 performs control for switching mechanical engagement / release of the first and second rotors 28 and 78 and the third rotor 18 by switching engagement / release of the clutch 48.

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

  When the engine 36 is generating power, the power of the engine 36 is transmitted to the first and second rotors 28 and 78, and the first and second rotors 28 and 78 are rotationally driven. When the rotational speeds of the first and second rotors 28 and 78 become higher than the rotational speed of the third rotor 18, an induced current is generated in the first rotor winding 30, and an electromagnetic field between the induced current and the field flux of the permanent magnet 33 is generated. Torque acts on the third rotor 18 by the interaction, and the third rotor 18 is rotationally driven. Thus, the power from the engine 36 transmitted to the first and second rotors 28 and 78 is electromagnetically coupled between the first rotor winding 30 of the first rotor 28 and the permanent magnet 33 of the third rotor 18. It is transmitted to the third rotor 18. The power transmitted to the third rotor 18 is transmitted to the wheels 38 after being shifted by the transmission 44 and used for driving a load such as driving a vehicle. Therefore, the wheel 38 can be rotationally driven using the power of the engine 36. Further, since the difference in rotation between the first and second rotors 28 and 78 and the third rotor 18 can be allowed, the engine 36 does not stall even if the rotation of the wheel 38 is stopped.

  Furthermore, since the induced current generated in the first rotor winding 30 also flows in the second rotor winding 80, a rotating magnetic field is formed in the second rotor 78, so that the induced current also flows in the second stator winding 70. Arise. As a result, torque acts between the second stator 66 and the second rotor 78. The induced current generated in the second stator winding 70 also flows into the first stator winding 20 to form a rotating magnetic field in the first stator 16, and due to electromagnetic interaction between this rotating magnetic field and the field flux of the permanent magnet 32. Also, torque acts on the third rotor 18. As a result, the torque of the third rotor 18 can be amplified.

  Here, the number of poles of the first rotor 28 is P1, the number of poles of the second rotor 78 is P2, the rotational speed of the input shaft 34 (first and second rotors 28, 78) is Ne [rpm], and the output shaft 24 ( The rotation speed of the third rotor 18) is Nout [rpm]. When the slip s between the first and second rotors 28 and 78 and the third rotor 18 is defined as the following equation (1), the first s is within the range of s = 1 (stall state) to s> 0. Power transmission can be performed between the second rotors 28 and 78 and the third rotor 18.

  s = (Ne-Nout) / Ne (1)

  From the equation (1), the rotational speed Nout of the output shaft 24 (third rotor 18) is represented by the following equation (2).

  Nout = (1-s) × Ne (2)

  Since the relative rotational speed between the first and second rotors 28 and 78 and the third rotor 18 is s × Ne, the first rotor winding 30 has a frequency f1 [Hz] expressed by the following equation (3). ] AC electromotive force is generated.

  f1 = P1 * s * Ne / 120 (3)

  Since the rotational speeds of the first and second rotors 28 and 78 are Ne, the connection between the first rotor winding 30 and the second rotor winding 80 is shown in FIG. 5 (when the rotation direction of the magnetic field is the same direction). The second stator 66 (second stator winding 70) can recover AC power having a frequency f2 [Hz] expressed by the following equation (4).

  f2 = P2 / 120 * (1-P1 / P2 * s) * Ne (4)

  When the number of poles P1 of the first rotor 28 and the number of poles P2 of the second rotor 78 are equal (P1 = P2), the frequency f2 of the AC power recovered by the second stator 66 is expressed by the following equation (5). And coincides with the synchronous drive frequency of the rotation speed Nout of the third rotor 18.

  f2 = P1 / 120 × (1-s) × Ne (5)

  Therefore, in the present embodiment, by setting P1 = P2, the AC power recovered by the second stator winding 70 is supplied to the first stator winding 20 without converting its frequency, and the third rotor 18 can be driven synchronously, and the torque of the third rotor 18 can be amplified. At that time, the phase of the AC power supplied from the second stator winding 70 to the first stator winding 20 is adjusted by the phase adjustment circuit 43, so that the gap between the first stator 16 and the third rotor 18 is adjusted. The acting torque can be adjusted.

  Further, from the equation (4), when the number of poles P2 of the second rotor 78 is equal to or greater than the number of poles P1 of the first rotor 28 (P2 ≧ P1), the second rotor 66 acts between the second stator 66 and the second rotor 78. The torque to be applied is in the same direction as the torque acting between the first rotor 28 and the third rotor 18. That is, the torque of the input shaft 34 is the sum of the torque acting on the second rotor 78 and the torque acting on the first rotor 28.

  Further, by controlling the switching operation of the inverter 40 so that electric power is supplied from the power storage device 42 to the first stator winding 20, the wheel 38 is rotationally driven using the power of the engine 36 and the first stator winding 20. The rotational drive of the wheel 38 can be assisted by the power of the third rotor 18 generated using the power supplied to the wheel. In this case, the power transmitted to the wheel 38 is larger than the power of the engine 36. On the other hand, by controlling the switching operation of the inverter 40 so that power is recovered from the second stator winding 70 to the power storage device 42, the wheels 38 are rotationally driven using the power of the engine 36 and the power of the engine 36 is The part can be converted into the electric power of the second stator winding 70 and recovered by the power storage device 42. In this case, the power transmitted to the wheel 38 is smaller than the power of the engine 36.

  In addition, when EV (Electric Vehicle) traveling is performed by driving the load using the power of the rotating electrical machine 10 without using the power of the engine 36 (rotating the wheel 38), the electronic control unit 50 By controlling the switching operation, drive control of the load is performed. For example, the electronic control unit 50 controls the switching operation of the inverter 40 so as to supply power from the power storage device 42 to the first stator winding 20, thereby supplying power supplied to the first stator winding 20 to the first stator winding 20. The electric power of the third rotor 18 is converted by the electromagnetic coupling between the wire 20 and the permanent magnet 32, and the wheel 38 is driven to rotate. Thus, even if the engine 36 does not generate power, the wheels 38 can be rotationally driven by supplying power to the first stator winding 20. In addition, the electronic control unit 50 controls the switching operation of the inverter 40 so that power is recovered from the first stator winding 20 to the power storage device 42 during the load deceleration operation, thereby transferring the load power to the first stator winding. The electric power of the first stator winding 20 can be converted by the electromagnetic coupling between the wire 20 and the permanent magnet 32 and collected in the power storage device 42.

  Further, when the vehicle speed (the rotation speed of the wheel 38) exceeds a certain speed and Nout> Ne is established, the clutch 48 is engaged to connect the first and second rotors 28, 78 and the third rotor 18. Due to the mechanical connection, joules are generated by the induction current flowing through the first and second rotor windings 30 and 80 due to the slip between the first and second rotors 28 and 78 and the third rotor 18. Loss can be suppressed. Further, when the clutch 48 is engaged, the torque transmitted between the first and second rotors 28 and 78 and the third rotor 18 can be limited by adjusting the fastening force of the clutch 48. . Therefore, the transmission of impact torque between the first and second rotors 28 and 78 and the third rotor 18 can be suppressed.

  Further, the electronic control unit 50 can form a rotating magnetic field in the second stator 66 by controlling the switching operation of the inverter 40 so as to supply power from the power storage device 42 to the second stator winding 70. In response to the rotating magnetic field of the second stator 66 acting on the second rotor 78, an induced current is generated in the second rotor winding 80. Then, torque is applied between the second stator 66 and the second rotor 78 by electromagnetic interaction between the rotating magnetic field of the second stator 66 and the induced current of the second rotor winding 80, so that the second rotor 78. And the engine 36 can be cranked. As a result, the engine 36 can be started using the power supplied to the second stator winding 70. The engine 36 can be started while the third rotor 18 is rotating (while the vehicle is traveling) or while the third rotor 18 is stopped (when the vehicle is stopped).

  In the present embodiment described above, an induced current is generated in the first and second rotor windings 30 and 80 as a rotational difference is generated between the first and second rotors 28 and 78 and the third rotor 18. A rotating magnetic field is generated by flowing, and torque acts between the first rotor 28 and the third rotor 18 in response to the rotating magnetic field generated in the first rotor winding 30 acting on the third rotor 18. Thereby, the power from the engine 36 connected to the first and second rotors 28 and 78 can be transmitted to the wheel 38 connected to the third rotor 18. Further, an induced electromotive force is generated in the second stator winding 70 in response to the rotating magnetic field generated in the second rotor winding 80 acting on the second stator 66, and this induced electromotive force is generated by the first stator winding 20. , A rotating magnetic field is generated, and torque is generated between the first stator 16 and the third rotor 18 in response to the rotating magnetic field generated by the first stator winding 20 acting on the third rotor 18. Works. Accordingly, the torque of the third rotor 18 can be amplified using the induced current flowing through the first and second rotor windings 30 and 80. Further, the second stator 66 and the second rotor 78 constitute an induction machine, and the second stator 66 and the second rotor are generated by the rotating magnetic field generated in the second rotor winding 80 and the induced current flowing in the second stator winding 70. Torque acts between the two. Thus, the torque generated by the engine 36 is received not only by the torque generated between the first rotor 28 and the third rotor 18 but also by the torque generated between the second stator 66 and the second rotor 78. be able to. Thus, according to the present embodiment, between the first rotor 28 and the third rotor 18, between the first stator 16 and the third rotor 18, and between the second stator 66 and the second rotor 78. Since torque can be applied to the torque transmission capacity, torque transmission capacity (torque transmission density) can be improved.

  Further, when the torque from the engine 36 is transmitted to the wheel 38, a difference in rotation between the first and second rotors 28 and 78 and the third rotor 18 can be allowed, so that the rotating electrical machine 10 is used as a starting device. Can function. Therefore, it is not necessary to separately provide a starting device such as a friction clutch or a torque converter. Further, between the first and second rotors 28 and 78 and the third rotor 18 without controlling the switching operation of the inverter 40 (without supplying power from the power storage device 42 to the first stator winding 20). Therefore, the power from the engine 36 can be transmitted to the wheels 38 even when the amount of power stored in the power storage device 42 is small or at a very low temperature.

  In Patent Document 1 described above, the frequency of the AC power that can be recovered by the transformer rotor and the transformer stator is proportional to the differential rotational speed of the first rotor and the second rotor, and is not synchronized with the rotational speed of the first rotor. Therefore, an inverter that supplies power to the stator windings and an inverter that supplies power to the transformer stator windings are separately required. In contrast, in the present embodiment, the frequency f2 of the AC power recovered by the second stator 66 is set to be the third rotor 18 by making the pole number P1 of the first rotor 28 equal to the pole number P2 of the second rotor 78. Can be made to coincide with the synchronous driving frequency of the rotation speed Nout. Therefore, the AC power recovered by the second stator winding 70 can be supplied to the first stator winding 20 without converting its frequency, and the third rotor 18 can be driven synchronously. As a result, the inverter can be shared and the configuration of the apparatus can be simplified. Furthermore, since the AC power recovered by the second stator winding 70 can be supplied to the first stator winding 20 without going through the inverter and the third rotor 18 can be driven to rotate, the capacity of the inverter is reduced. It is possible to achieve high efficiency. And the torque which acts between the 1st stator 16 and the 3rd rotor 18 is adjusted by adjusting the phase of the alternating current power supplied from the 2nd stator winding 70 to the 1st stator winding 20 with the adjustment circuit 43. Can be adjusted.

  Further, in Patent Document 1 described above, no torque is generated between the transformer rotor and the transformer stator. Therefore, when starting the engine, torque is applied from the stator to the second rotor via the first rotor. It is necessary to perform cranking. For this reason, it is difficult to start the engine independently of the drive wheels, and the efficiency at the time of starting the engine also decreases. On the other hand, in the present embodiment, the engine 36 is cranked by applying a torque between the second stator 66 and the second rotor 78 by supplying power from the power storage device 42 to the second stator winding 70. Therefore, the engine 36 can be efficiently started independently of the wheels 38.

  Next, another configuration example of this embodiment will be described.

  In the present embodiment, the number of poles P1 of the first rotor 28 may be different from the number of poles P2 of the second rotor 78. However, when P1 ≠ P2, the frequency f2 of the AC power recovered by the second stator 66 does not match the synchronous driving frequency of the rotation speed Nout of the third rotor 18. In that case, as shown in FIG. 8, a rectifier 93 that rectifies the AC power recovered by the second stator winding 70 is provided, and the power rectified by the rectifier 93 is converted into AC by the inverter 40 to be converted into the first stator. By supplying the winding 20, torque can be applied between the first rotor 28 and the third rotor 18 to amplify the torque of the third rotor 18. Therefore, the third rotor 18 can be rotationally driven using the electric power recovered by the second stator winding 70 regardless of the conditions of the number of poles P1, P2. Furthermore, the power rectified by the rectifier 93 can be recovered in the power storage device 42. In addition, as shown in FIG. 8, an inverter 41 that converts DC power from the power storage device 42 into AC (for example, three-phase AC) and supplies it to each phase of the second stator winding 70 is provided. By controlling the switching operation of the inverter 41 so as to supply power to the two stator windings 70, the engine 36 can be started using the power supplied to the second stator windings 70.

  Further, when the connection between the first rotor winding 30 and the second rotor winding 80 is shown in FIG. 5 (when the rotation direction of the magnetic field is the same direction), from the above-described equation (4), By setting the number of poles P2 to be equal to or greater than the number of poles P1 of the first rotor 28 (P2 ≧ P1), the torque acting between the second stator 66 and the second rotor 78 is the first rotor 28 and the third rotor. 18 and in the same direction as the torque acting between the two. As a result, the load torque received by the engine 36 is the sum of the torque applied to the second rotor 78 and the torque applied to the first rotor 28, and the load torque received by the engine 36 can be increased.

  In this embodiment, the rotation direction of the rotating magnetic field generated when an alternating current flows through the first rotor winding 30 and the second rotor winding 80 is the same between the first rotor winding 30 and the second rotor winding 80. The first rotor winding 30 and the second rotor winding 80 can also be connected in reverse phase so that they are in opposite directions. For example, when both the first rotor winding 30 and the second rotor winding 80 are constituted by three-phase windings of U phase, V phase, and W phase, as shown in FIG. Are connected to the U phase of the second rotor winding 80, the V phase of the first rotor winding 30 is connected to the W phase of the second rotor winding 80, and the W phase of the first rotor winding 30 is connected. Connect the phase and the V phase of the second rotor winding 80 (connect the same phase windings for one of the three phases, and connect the different phase windings for two of the three phases) Thus, the rotation directions of the magnetic fields generated by the first rotor winding 30 and the second rotor winding 80 are opposite to each other.

  When the connection between the first rotor winding 30 and the second rotor winding 80 is shown in FIG. 9 (when the rotation direction of the magnetic field is opposite), the second stator 66 (second stator winding 70) AC power having a frequency f2 [Hz] expressed by equation (6) can be recovered.

  f2 = P2 / 120 × (1 + P1 / P2 × s) × Ne (6)

  In this case, from Equation (6), the torque acting between the second stator 66 and the second rotor 78 is independent of the conditions of the number of poles P1 of the first rotor 28 and the number of poles P2 of the second rotor 78. The torque acts between the first rotor 28 and the third rotor 18 in the same direction. Therefore, the load torque received by the engine 36 is the sum of the torque acting on the second rotor 78 and the torque acting on the first rotor 28, and the load torque received by the engine 36 can be increased.

  However, in this case, the frequency f2 of the AC power recovered by the second stator 66 is the rotation of the third rotor 18 regardless of the conditions of the number of poles P1 of the first rotor 28 and the number of poles P2 of the second rotor 78. It does not coincide with the synchronous drive frequency of the speed Nout. Therefore, a rectifier 93 and an inverter 41 are provided as shown in FIG. Then, the AC power recovered by the second stator winding 70 is rectified by the rectifier 93, the electric power rectified by the rectifier 93 is converted into AC by the inverter 40 and supplied to the first stator winding 20, 3 The torque of the rotor 18 is amplified. Accordingly, the third rotor 18 can be rotationally driven using the power recovered by the second stator winding 70 regardless of the connection condition between the first rotor winding 30 and the second rotor winding 80. . Further, when starting the engine 36, the power supplied to the second stator winding 70 is used by controlling the switching operation of the inverter 41 so that power is supplied from the power storage device 42 to the second stator winding 70. The engine 36 is cranked.

  In this embodiment, for example, as shown in FIG. 10, the first cage conductor 130 is disposed on the first rotor 28 so as to face the third rotor 18 (permanent magnet 33), and the second rotor 78 is disposed on the second rotor 78. The second squirrel-cage conductor 180 may be disposed to face the second stator 66 (the teeth around which the second stator winding 70 is wound). The first cage conductor 130 and the second cage conductor 180 are electrically connected. In this example, the frequency f2 of the AC power recovered by the second stator 66 is set by setting the number of poles P1 of the permanent magnet 33 of the third rotor 18 equal to the number of poles P2 of the second stator 66 (P1 = P2). Coincides with the synchronous driving frequency of the rotational speed Nout of the third rotor 18. Therefore, the AC power recovered by the second stator winding 70 can be supplied to the first stator winding 20 without converting its frequency, and the third rotor 18 can be driven synchronously. At that time, the phase of the AC power supplied from the second stator winding 70 to the first stator winding 20 is adjusted by the phase adjustment circuit 43, so that the gap between the first stator 16 and the third rotor 18 is adjusted. The acting torque can be adjusted.

  On the other hand, when P1 ≠ P2, the frequency f2 of the AC power recovered by the second stator 66 does not coincide with the synchronous drive frequency of the rotational speed Nout of the third rotor 18, so that the rectifier 93 is substituted for the phase adjustment circuit 43. And an inverter 41 (see FIG. 8).

  Further, by setting the number of poles P2 of the second stator 66 to be equal to or greater than the number of poles P1 of the permanent magnet 33 of the third rotor 18 (P2 ≧ P1), the second stator 66 acts between the second stator 66 and the second rotor 78. The torque is in the same direction as the torque acting between the first rotor 28 and the third rotor 18, and the load torque received by the engine 36 is the torque acting on the second rotor 78 and the torque acting on the first rotor 28. Become sum.

  In this embodiment, for example, as shown in FIGS. 11 and 12, a continuously variable transmission (CVT) 144 may be disposed between the rotating electrical machine 10 and the wheel 38. In the example shown in FIG. 11, the forward / reverse switching device 46 is disposed between the rotating electrical machine 10 and the continuously variable transmission 144, and in the example shown in FIG. 12, the forward / backward traveling is performed between the engine 36 and the rotating electrical machine 10. A switching device 46 is arranged. When the clutch C1 is in the engaged state and the brake B1 is in the released state, the forward / reverse switching device 46 outputs the input torque (torque from the third rotor 18 in FIG. 11, torque from the engine 36 in FIG. 12). The direction is output without reversing, and when the brake B1 is engaged and the clutch C1 is disengaged, the input torque is output with the direction reversed. On the other hand, when both the clutch C1 and the brake B1 are in the released state, torque transmission between the input and output of the forward / reverse switching device 46 is interrupted. According to the example shown in FIG. 12, the torque generated between the first rotor 28 and the third rotor 18 by disengaging the clutch C1 and the brake B1 of the forward / reverse switching device 46 when performing EV traveling. Thus, the engine 36 can be prevented from being rotated, and loss caused by the engine 36 being rotated can be suppressed.

  In the present embodiment, the input shaft 34 and the output shaft 24 of the rotating electrical machine 10 can be interchanged. That is, the third rotor 18 may be mechanically connected to the engine 36, and the first and second rotors 28 and 78 may be mechanically connected to the wheel 38 via the transmission 44. In this case, power from the engine 36 is transmitted to the third rotor 18, and power from the first and second rotors 28 and 78 is transmitted to the wheels 38. In this case, the torque of the output shaft 24 can be received by the torque generated between the first rotor 28 and the third rotor 18 and the torque generated between the second stator 66 and the second rotor 78. it can. Further, the electric power can be supplied from the power storage device 42 to the second stator winding 70 so that a torque is applied between the second stator 66 and the second rotor 78 to perform EV traveling.

  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.

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. It is a figure which shows schematic structure of 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. 3 is a diagram illustrating an example of connection between a first rotor winding 30 and a second rotor winding 80. FIG. FIG. 3 is a diagram illustrating a configuration example of a first rotor 28, a third rotor 18, and a first stator 16. FIG. 5 is a diagram illustrating a configuration example of a second rotor 78 and a second stator 66. It is a figure which shows the other schematic structure of the power transmission device which concerns on embodiment of this invention. FIG. 6 is a diagram showing another example of connection between the first rotor winding 30 and the second rotor winding 80. 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 a hybrid drive device provided with the power transmission device which concerns on embodiment of this invention. It is a figure which shows the other schematic structure of a hybrid drive device provided with the power transmission device which concerns on embodiment of this invention.

Explanation of symbols

  10 rotating electrical machines, 16 first stator, 18 third rotor, 20 first stator winding, 24 output shaft, 28 first rotor, 30 first rotor winding, 32, 33 permanent magnet, 34 input shaft, 36 engine, 38 Wheel, 40, 41 Inverter, 42 Power storage device, 43 Phase adjustment circuit, 44 Transmission, 46 Forward / reverse switching device, 48 Clutch, 50 Electronic control unit, 66 Second stator, 70 Second stator winding, 78 Second Rotor, 80 second rotor winding, 93 rectifier, 130 first cage conductor, 144 continuously variable transmission, 180 second cage conductor.

Claims (9)

A first rotor provided with a first rotor conductor capable of generating a rotating magnetic field;
A second rotor coupled to the first rotor, the second rotor being disposed connected to the first rotor conductor and capable of generating a rotating magnetic field;
A first stator provided with a first stator conductor capable of generating a rotating magnetic field;
A third rotor capable of rotating relative to the first and second rotors, wherein torque acts between the first rotor and the first rotor in response to a rotating magnetic field generated by the first rotor conductor. A third rotor in which a torque acts between the first stator in response to a rotating magnetic field generated in the first stator conductor;
A second stator provided with a second stator conductor through which an induced current flows in response to the generation of a rotating magnetic field in the second rotor conductor, the rotation generated by the induced current and the second rotor conductor A second stator capable of applying torque to the second rotor by interaction with a magnetic field;
With
Power from the prime mover is transmitted to one of the first and second rotors and the third rotor, and power is transmitted to the load from the other of the first and second rotors and the third rotor,
The first and second rotor conductors generate a rotating magnetic field by causing an induced current to flow with a difference in rotation between the first rotor and the third rotor,
Can der power supply from the second stationary element conductor to the first stationary element conductor is,
The first rotor so that the rotating direction of the rotating magnetic field generated when the induced current flows through the first rotor conductor and the second rotor conductor is the same in the first rotor conductor and the second rotor conductor. The conductor and the second rotor conductor are connected,
A power transmission device in which the number of poles of the second rotor is equal to or greater than the number of poles of the first rotor . The power transmission device according to claim 1,
A power transmission device in which the number of poles of the second rotor is equal to the number of poles of the first rotor. The power transmission device according to claim 1 or 2,
A power transmission device capable of supplying power from a power source to the second stator conductor . The power transmission device according to any one of claims 1 to 3 ,
The first rotor is provided with a first rotor winding as a first rotor conductor, and the second rotor is provided with a second rotor winding as a second rotor conductor. apparatus. The power transmission device according to claim 4 ,
The second stator is provided with a stator winding as a second stator conductor,
A power transmission device in which a winding axis of the second rotor winding and a winding axis of the stator winding coincide with the opposing direction of the second rotor and the second stator . The power transmission device according to any one of claims 1 to 3 ,
A power transmission device in which a first cage conductor is disposed as a first rotor conductor in the first rotor and a second cage conductor is disposed as a second rotor conductor in the second rotor. The power transmission device according to any one of claims 1 to 6 ,
The third rotor is provided with a magnet that generates a field flux,
A power transmission device in which a torque acts between a first rotor and a third rotor by an interaction between the field magnetic flux and a rotating magnetic field generated by a first rotor conductor . The power transmission device according to any one of claims 1 to 6 ,
The third rotor is provided with a magnet that generates a field flux,
A power transmission device in which a torque acts between the first stator and the third rotor by the interaction between the field magnetic flux and the rotating magnetic field generated by the first stator conductor . The power transmission device according to any one of claims 1 to 8,
A power transmission device comprising an engagement device capable of mechanically engaging the first and second rotors and the third rotor .

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