JP2009278746A - Power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve torque transmission capacity while enlargement of a constitution of a power transmission device is suppressed and to facilitate cooling of a rotor where a rotor conductor in which an induction current flows is arranged. <P>SOLUTION: A rotating field is generated by making an induction current flow in rotor winding 30 due to occurrence of a rotation difference between an input-side rotor 28 and an output-side rotor 18, and torque operates between the input-side rotor 28 and the output-side rotor 18. The rotating field is generated by supplying power of rotor winding 30 to stator winding 20 through a slip ring 95, a rectifier 93, a boosting converter 94 and an inverter 40. Torque operates between a stator 16 and the output-side rotor 18. The stator 16 is installed on an innermost layer on an inner peripheral side of the output-side rotor 18. The input-side rotor 28 is disposed on an outermost layer on an outer peripheral side of the output-side rotor 18. <P>COPYRIGHT: (C)2010,JPO&INPIT

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 Japanese Patent Laid-Open No. 9-46815

  In the power transmission device of Patent Document 1, in order to increase the torque transmission capacity, it can be generated between the first rotor and the second rotor by electromagnetic coupling between the winding of the second rotor and the magnet of the first rotor. The maximum torque needs to be increased. However, since the stator is disposed on the radially outer side (outermost layer) of the first rotor and the second rotor is disposed on the radially inner side (innermost layer) of the first rotor, the first rotor and the second rotor are arranged. The maximum torque that can be generated between It is possible to increase the maximum torque that can be generated between the first rotor and the second rotor by increasing the length in the rotation axis direction of the portion where the first rotor and the second rotor face each other in the radial direction. However, since the transformer rotor and the transformer stator are adjacent to the second rotor in the direction of the rotation axis, the rotation of the facing portion between the first rotor and the second rotor without increasing the length of the entire power transmission device in the rotation axis direction. Increasing the axial length is difficult. Therefore, in Patent Document 1, it is difficult to increase the torque transmission capacity while suppressing an increase in the size of the power transmission device.

  Further, in Patent Document 1, when the power from the engine is transmitted to the drive wheels by electromagnetic coupling between the winding of the second rotor and the magnet of the first rotor, an induced current flows through the winding of the second rotor. Since the second rotor generates heat, it is necessary to cool the second rotor. However, since the second rotor is disposed in the innermost layer, cooling air (air) is difficult to be introduced into the second rotor, and in order to cool the rotating innermost layer of the second rotor, the second rotor is connected to the second rotor. It is necessary to form a supply passage for liquid refrigerant such as oil or water inside the engine shaft and supply the liquid refrigerant to the second rotor via the supply passage inside the engine shaft. In that case, since it is necessary to supply liquid refrigerant to the supply passage inside the rotating engine shaft, the configuration for supplying the liquid refrigerant to the second rotor is complicated, and the configuration for cooling the second rotor is complicated. Turn into.

  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 the torque transmission capacity while suppressing an increase in the size of the physique. Furthermore, an object of the present invention is to facilitate cooling of a rotor in which a rotor conductor through which an induced current flows is provided in this power transmission device.

  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 conductor capable of generating a rotating magnetic field, a stator provided with a stator conductor capable of generating a rotating magnetic field, and a first rotation. A second rotor that can rotate relative to the rotor, wherein torque is generated between the first rotor and the stator conductor in response to a rotating magnetic field generated by the rotor conductor. A first rotor and a second rotation provided with a second rotor in which a torque acts between the stator and a power transmission unit for taking out AC power of the rotor conductor in response to the application of a magnetic field; The power from the prime mover is transmitted to one of the rotors, and the power is transmitted to the load from the other of the first rotor and the second rotor, and the rotor conductor includes the first rotor and the second rotor. A rotating magnetic field is generated when an induced current flows due to a rotational difference between The extracted AC power can be supplied to the stator conductor, the stator is disposed radially inside the second rotor, and the first rotor is disposed radially outside the second rotor. The gist.

  In one aspect of the present invention, the power transmission unit includes a slip ring that is connected to the rotor conductor of the first rotor and rotates with the first rotor while sliding with respect to the brush, and AC power from the brush is fixed. It is preferable that it can be supplied to the child conductor.

  In one aspect of the present invention, the power transmission unit is a power transmission rotor coupled to the first rotor, the power transmission unit being connected to the rotor conductor of the first rotor and capable of generating a rotating magnetic field. Electric power transmission rotor provided with a rotor conductor and electric power transmission stator conductor provided with an electric current transmission stator conductor through which an induced current flows due to the generation of a rotating magnetic field in the electric power transmission rotor conductor It is preferable that AC power from the stator conductor for power transmission can be supplied to the stator conductor.

  In one aspect of the present invention, it is preferable to further include a power conversion unit capable of converting the AC power extracted by the power transmission unit and supplying the AC power to the stator conductor. In this aspect, the power conversion unit includes a rectifier that rectifies the AC power extracted by the power transfer unit, and a DC-DC converter that converts the voltage rectified by the rectifier and outputs the DC-DC converter. It is preferable that the voltage-converted power is converted into an alternating current by an inverter and supplied to the stator conductor.

  According to the present invention, the stator is disposed on the radially inner side of the second rotor, and the first rotor is disposed on the radially outer side of the second rotor, so that the length of the power transmission device in the rotational axis direction is increased. It is possible to increase the maximum torque that can be generated between the first rotor and the second rotor while suppressing the increase in the height. As a result, the torque transmission capacity can be improved while suppressing an increase in the size of the power transmission device. Furthermore, since the first rotor that generates heat due to the induced current flowing through the rotor conductor is arranged on the radially outer side of the second rotor, the first rotor can be easily cooled.

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

  1-3 is a figure which shows the outline of a structure of 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, FIG. 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 is disposed in a space on the inner peripheral side of the casing 15 formed between the engine 36 and the transmission 14. The rotating electrical machine 10 includes a stator 16 fixed to a casing 15, a first rotor 28 that can rotate relative to the stator 16, and a second rotor 18 that can rotate relative to the stator 16 and the first rotor 28. . The second rotor 18 is disposed to face the first rotor 28 and the stator 16 with a predetermined gap in a radial direction (vertical direction in FIG. 2) perpendicular to the rotational axis direction (left-right direction in FIG. 2) of the first rotor 28. 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 power from the engine 36 is transmitted to the first rotor 28. The On the other hand, the second 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. The power from the second rotor 18 is transmitted after being shifted by the transmission 44. In the following description, the first rotor 28 is an input side rotor, and the second rotor 18 is an output side rotor.

  The stator 16 includes a stator core (stator core) 51 and a plurality of (for example, three-phase) stator windings (stator conductors) 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 input-side rotor 28 includes a rotor core (first rotor core) 52 and a plurality of (for example, three-phase) rotor windings (rotor conductors) 30 disposed on the rotor core 52 along the circumferential direction thereof. Including. 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 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 to face the stator 16 (stator core 51), and the permanent magnet 33 is disposed to face the input side rotor 28 (rotor core 52). Here, the permanent magnets 32 and 33 can also be integrated.

  In the present embodiment, the stator 16 is disposed on the radially inner side of the output side rotor 18, and the input side rotor 28 is disposed on the radially outer side of the output side rotor 18. That is, the stator 16 is disposed in the innermost layer, the output-side rotor 18 is disposed in the intermediate layer, and the input-side rotor 28 is disposed in the outermost layer. The permanent magnet 32 is disposed on the inner peripheral portion of the output side rotor 18 (rotor core 53) so as to face the stator 16 (stator core 51), and the permanent magnet 33 faces the input side rotor 28 (rotor core 52). The output side rotor 18 (rotor core 53) is disposed on the outer peripheral portion.

  In the example shown in FIG. 2, the stator 16 is fixed to the casing 15 via a stator support member 81, and the stator support member 81 is connected to the stator 16 from the transmission 14 side. The input side rotor 28 is mechanically connected to the input shaft 34 via a rotor support member 82, and the rotor support member 82 is connected to the input side rotor 28 from the engine 36 side. The output side rotor 18 is mechanically connected to the output shaft 24 via a rotor support member 83, and the rotor support member 83 is connected to the output side rotor 18 from the engine 36 side. The rotor support member 82 is disposed closer to the engine 36 than the rotor support member 83. The output side rotor 18 and the rotor support member 83 are rotatably supported by the casing 15 (stator support member 81) by bearings 84 and 85. The input side rotor 28 and the rotor support member 82 are rotors by bearings 86 and 87. The support member 83 is rotatably supported. The bearings 84 and 86 are disposed closer to the transmission 14 than the rotors 18 and 28 and the stator 16, and the bearings 85 and 87 are disposed closer to the engine 36 than the rotors 18, 28 and the stator 16.

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

  The clutch 48 can selectively perform mechanical engagement between the input shaft 34 (input-side rotor 28) and the output shaft 24 (output-side rotor 18) and release thereof by engagement / release. By engaging the clutch 48 and mechanically engaging the input-side rotor 28 and the output-side rotor 18, the input-side rotor 28 and the output-side rotor 18 are integrally rotated at the same rotational speed. On the other hand, by releasing the clutch 48 and releasing the mechanical engagement between the input-side rotor 28 and the output-side rotor 18, a difference in rotational speed between the input-side rotor 28 and the output-side rotor 18 is allowed. In the example shown in FIG. 2, the clutch 48 is disposed closer to the engine 36 than the input side rotor 28 and the output side rotor 18, and is disposed in a space formed between the input side rotor 28 and the rotor support member 82. Has been. By engaging the clutch 48, the input side rotor 28 and the output side rotor 18 are connected via the rotor support members 82 and 83. Here, the clutch 48 can be switched between engagement and disengagement using, for example, hydraulic pressure, and the hydraulic pressure is supplied to the clutch 48 via an oil passage 49 formed inside the output shaft 24. However, it is also possible to switch engagement / release of the clutch 48 using electromagnetic force. Further, by adjusting the oil pressure and electromagnetic force supplied to the clutch 48, the fastening force of the clutch 48 can be adjusted.

  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 switching operation of the switching element, and converts each phase of the stator winding 20 to each phase. It is possible to supply.

  The slip ring 95 is mechanically coupled to the input side rotor 28 and is electrically connected to each phase of the rotor winding 30 and the brush 96. The slip ring 95 rotates with the input-side rotor 28 while sliding with respect to the brush 96 whose rotation is fixed (while maintaining electrical connection with the brush 96). The brush 96 is electrically connected to the rectifier 93, and power from the brush 96 is supplied to the rectifier 93. The slip ring 95 and the brush 96 can constitute a power transmission unit for extracting the power (AC power) of the rotor winding 30 of the input side rotor 28, and the extracted AC power is supplied to the rectifier 93. . In the example shown in FIG. 2, the slip ring 95 and the brush 96 are disposed closer to the engine 36 than the rotor support member 82, and the slip ring 95 is connected to the input side rotor 28 via the rotor support member 82. . The rotor support member 82 here has a function of shielding the clutch 48 and the bearing 87 from the slip ring 95 and the brush 96 in addition to the function of connecting the slip ring 95 and the input side rotor 28.

  The rectifier 93 rectifies AC power from the rotor winding 30 taken out by the slip ring 95 and the brush 96 and converts it into DC. The step-up converter (DC-DC converter) 94 includes a switching element, and boosts (voltage converts) DC power rectified by the rectifier 93 by the switching operation of the switching element and outputs it. 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, AC power from the rotor winding 30 taken out by the slip ring 95 and the brush 96 can be supplied to each phase of the stator winding 20. Further, the DC power boosted by the boost converter 94 can be recovered by the power storage device 42. Here, rectifier 93 performs power conversion in only one direction from slip ring 95 side to boost converter 94 side, and boost converter 94 is unidirectional from rectifier 93 side to power storage device 42 side (or inverter 40 side). Only perform power conversion. As described above, the power converter that includes the rectifier 93 and the step-up converter 94 and that can convert the AC power extracted by the slip ring 95 and the brush 96 to be supplied to each phase of the stator winding 20 is configured. can do.

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

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

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

  When the 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 performs a switching operation of a switching element (not shown) in the boost converter 94. The boost ratio (voltage conversion ratio) in the boost converter 94 is controlled by controlling the duty ratio (the ratio of the ON period in the switching cycle). At that time, electronic control unit 50 controls the boost ratio in boost converter 94 such that the output voltage of boost converter 94 is higher than the voltage of power storage device 42. As a result, a current flows from the boost converter 94 to the wiring between the power storage device 42 and the inverter 40, and an induced current flows through the rotor winding 30, so that torque acts between the input-side rotor 28 and the output-side rotor 18. 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.

  Next, the operation of the hybrid drive device according to the present embodiment, particularly the operation when the wheels 38 are rotationally driven 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. 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 controls the boost ratio in the boost converter 94 so that the output voltage of the boost converter 94 is higher than the voltage of the power storage device 42, whereby an induced current flows in the rotor winding 30, and this induced current Torque acts on the output-side rotor 18 due to electromagnetic interaction between the magnetic field flux of the permanent magnet 33 and the output-side rotor 18. 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 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 rotational 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, and the rotating electrical machine 10 functions as a starting device. be able to. Therefore, it is not necessary to separately provide a starting device such as a friction clutch or a torque converter. Furthermore, since power can be transmitted between the input-side rotor 28 and the output-side rotor 18 without supplying power from the power storage device 42 to the stator winding 20, the power storage amount of the power storage device 42 is small. Even at extremely low temperatures, the power from the engine 36 can be transmitted to the wheels 38.

  Further, AC power generated in the rotor winding 30 is taken out via the slip ring 95 and the brush 96. The extracted AC power is rectified to DC by a rectifier 93, and the rectified DC power is boosted by a boost converter 94. Then, the DC power from the boost converter 94 is converted into AC by the inverter 40 and then supplied to the stator winding 20, whereby a rotating magnetic field is formed in the stator 16. Torque acts on the output side rotor 18 also by electromagnetic interaction between the rotating magnetic field of the stator 16 and the field flux of the permanent magnet 32 of the output side rotor 18. Thereby, a torque amplification function for amplifying the torque of the output side rotor 18 can be realized. It is also possible to collect DC power from boost converter 94 in power storage device 42.

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

  Further, when the vehicle speed (the rotational speed of the wheel 38) exceeds a certain speed and (the rotational speed of the output-side rotor 18)> (the rotational speed of the input-side rotor 28) is satisfied, the clutch 48 is engaged. By mechanically connecting the input side rotor 28 and the output side rotor 18, Joule loss caused by induction current flowing through the rotor winding 30 due to the slip between the input side rotor 28 and the output side rotor 18. Can be suppressed. When engaging the clutch 48, the torque transmitted between the input side rotor 28 and the output side rotor 18 can be limited by adjusting the fastening force of the clutch 48. Therefore, transmission of impact torque between the input side rotor 28 and the output side rotor 18 can be suppressed.

  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 power is supplied from the power storage device 42 to the stator winding 20, thereby supplying the stator winding 20 with the stator winding 20 and the permanent magnet 32. Is converted into the power of the output-side rotor 18 by the electromagnetic coupling, and the 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 the power transmission device according to the present embodiment, in order to increase the torque transmission capacity, the input side rotor 28 and the output side are coupled 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. It is desirable to increase the maximum torque that can be generated with the rotor 18. On the other hand, in the present embodiment, the stator 16 is disposed in the innermost layer on the inner peripheral side of the output-side rotor 18, and the input-side rotor 28 is disposed in the outermost layer on the outer peripheral side of the output-side rotor 18. Since the outer diameters of the rotor 28 and the output-side rotor 18 can be enlarged, the input-side rotor 28 and the output-side rotor 28 and the output-side rotor can be increased without increasing the length in the rotational axis direction of the portion where the input-side rotor 28 and the output-side rotor 18 are opposed in the radial direction. The maximum torque that can be generated with the rotor 18 can be increased. Therefore, torque transmission capacity (torque transmission density) can be improved while suppressing an increase in the size of the rotating electrical machine 10.

  Further, in the present embodiment, the electric power generated in the rotor winding 30 is taken out via the slip ring 95 and the brush 96 that slide with each other, and in order not to deteriorate the power transmission function in the slip ring 95 and the brush 96, It is desirable to prevent oil or water from adhering to the sliding part of the slip ring 95 and the brush 96. In contrast, in the present embodiment, the rotor support member 82 shields the clutch 48 and the bearing 87 from the slip ring 95 and the brush 96, so that the oil supplied to the clutch 48 and the bearing 87 slides between the slip ring 95 and the brush 96. It is possible to prevent scattering to the moving part. As a result, it is possible to prevent the power transmission function of the slip ring 95 and the brush 96 from deteriorating.

  In this embodiment, when the power from the engine 36 is transmitted to the wheel 38 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, Since the input side rotor 28 generates heat when the induced current flows, it is desirable to cool the input side rotor 28. On the other hand, in this embodiment, since the input side rotor 28 is disposed in the outermost layer, the input side rotor 28 can be easily cooled by air cooling, liquid cooling, or the like, and overheating of the input side rotor 28 can be prevented. This can prevent dielectric breakdown of the rotor winding 30 due to overheating. Since the stator 16 generates heat when power is supplied to the stator winding 20, it is desirable to cool the stator 16. However, the stator 16 is fixed to the casing 15 and does not rotate, so it is disposed in the innermost layer. However, cooling by air cooling or liquid cooling does not become difficult. Hereinafter, a configuration example for cooling the input side rotor 28 and the stator 16 will be described.

  In the configuration example shown in FIG. 5, the air inlet 54 is formed in the brush support member 88 that mechanically connects the brush 96 and the casing 15. The rotor support member 82 is provided with a ventilation blade 55 projecting toward the brush support member 88, and the ventilation blade 55 rotates together with the input-side rotor 28 and the rotor support member 82. An air discharge port 56 is formed at a position facing the outer peripheral surface of the input side rotor 28 in the casing 15.

  The heat generated in the input side rotor 28 by the induced current flowing in the rotor winding 30 is transmitted to the rotor support member 82. The cooling air that has flowed into the air passage 57 formed between the brush support member 88 and the rotor support member 82 through the air inlet 54 collides with the rotor support member 82 as shown by the arrows in FIG. Thus, heat exchange is performed with the rotor support member 82. By this heat exchange, heat is removed from the rotor support member 82, and the input-side rotor 28 is cooled. The air that has collided with the rotor support member 82 is formed between the rotor support member 82 and the input side rotor 28 and the casing 15 as indicated by the arrows in FIG. To flow. The air flowing through the air passage 58 exchanges heat with the input side rotor 28. The input-side rotor 28 is also cooled by this heat exchange. The air that has exchanged heat with the input-side rotor 28 is discharged to the outside of the casing 15 through the air discharge port 56 as shown by the arrow in FIG. For the rotor support member 82, it is preferable to use a material having a low thermal resistance such as aluminum in order to improve the thermal conductivity from the input side rotor 28, and considering the strength and cost, for example, cast iron or the like is used. It is preferable to use it.

  Further, the heat generated in the stator 16 by supplying power to the stator winding 20 is transmitted to the casing 15 via the stator support member 81. The air passing through the air discharge port 56 exchanges heat with the casing 15, whereby heat is removed from the casing 15 and the stator 16 is cooled. As described above, in the configuration example shown in FIG. 5, the input side rotor 28 and the stator 16 are cooled by air cooling.

  In the configuration example shown in FIG. 6, compared to the configuration example shown in FIG. 5, the refrigerant supply passage 59 and the refrigerant discharge passage 60 are formed in the casing 15 and the stator support member 81. The refrigerant discharge passage 60 communicates with the interior of the stator 16 (stator core 51). Liquid refrigerant such as oil or water is supplied into the stator 16 (stator core 51) through the refrigerant supply passage 59 to exchange heat with the stator 16. The stator 16 is cooled by this heat exchange. The liquid refrigerant supplied to the inside of the stator 16 is discharged to the outside of the casing 15 through the refrigerant discharge passage 60. As described above, in the configuration example shown in FIG. 6, the input side rotor 28 is cooled by air cooling, and the stator 16 is cooled by liquid cooling. In addition, since the casing 15 and the stator support member 81 are fixed, it is easy to supply the liquid refrigerant to the refrigerant supply passage 59.

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

  In the configuration example shown in FIGS. 7 and 8, a casing instead of the slip ring 95 and the brush 96 in the configuration example shown in FIGS. 1 and 2 is used as a power transmission unit for taking out the power of the rotor winding 30 of the input side rotor 28. 15, a power transmission stator 66 fixed to the power transmission stator 66, and a power transmission rotor 78 that is disposed radially inside the power transmission stator 66 and is rotatable relative to the power transmission stator 66. The power transmission stator 66 includes a stator core 101 and a plurality of (for example, three-phase) power transmission stator windings (power transmission stator conductors) 70 disposed on the stator core 101 along the circumferential direction thereof. Including. The power transmission stator winding 70 is electrically connected to the rectifier 93. When a plurality of phases (for example, three phases) of alternating current flows through the power transmission stator winding 70, the power transmission stator winding 70 can generate a rotating magnetic field that rotates in the circumferential direction of the stator. The power transmission rotor 78 includes a rotor core 102, and a plurality of phases (for example, three phases) of power transmission rotor windings (power transmission rotor conductors) 80 disposed on the rotor core 102 along the circumferential direction thereof. And is mechanically coupled to the input side rotor 28. When a plurality of phases (for example, three phases) of alternating current flows through the plurality of phases of the power transmission rotor winding 80, the power transmission rotor winding 80 can generate a rotating magnetic field that rotates in the rotor circumferential direction. Air for cooling the input-side rotor 28 flows into the air passage 57 through a gap formed between the power transmission stator 66 and the power transmission rotor 78, as indicated by arrows in FIG.

  The power transmission rotor winding 80 is electrically connected (directly connected) to the rotor winding 30 of the input side rotor 28. Here, the rotating direction of the rotating magnetic field generated when an alternating current flows in the rotor winding 30 and the power transmission rotor winding 80 is opposite to each other in the rotor winding 30 and the power transmission rotor winding 80. Further, the rotor winding 30 and the power transmission rotor winding 80 are connected in reverse phase. For example, when the rotor winding 30 and the power transmission rotor winding 80 are both constituted by a U-phase, V-phase, and W-phase three-phase winding, as shown in FIG. Are connected to the U phase of the rotor winding 80 for power transmission, the V phase of the rotor winding 30 is connected to the W phase of the rotor winding 80 for power transmission, and the W phase of the rotor winding 30 is connected to the power transmission. By connecting the V phase of the rotor winding 80 (connecting windings of the same phase for one of the three phases and connecting windings of different phases for two of the three phases) The rotating directions of the magnetic fields generated by the rotor winding 30 and the power transmission rotor winding 80 are opposite to each other.

  A more detailed configuration example of the power transmission rotor 78 and the power transmission stator 66 is shown in FIG. In the example shown in FIG. 10, the power transmission rotor 78 and the power transmission stator 66 are arranged concentrically. In the stator core 101 of the power transmission stator 66, a plurality of teeth 101a protruding radially inward (on the power transmission rotor 78 side) are arranged at intervals along the stator circumferential direction. The winding 70 is wound around these teeth 101a, thereby forming a magnetic pole. In the rotor core 102 of the power transmission rotor 78, a plurality of teeth 102a protruding outward in the radial direction (on the power transmission stator 66 side) are arranged at intervals along the rotor circumferential direction. The winding 80 is wound around these teeth 102a, thereby forming a magnetic pole. The teeth 101a of the power transmission stator 66 and the teeth 102a of the power transmission rotor 78 are arranged to face each other in the radial direction orthogonal to the rotation center axis of the power transmission rotor 78, and the winding of the power transmission stator winding 70 is wound. The shaft and the winding axis of the power transmission rotor winding 80 coincide with this radial direction (the direction in which the power transmission stator 66 and the power transmission rotor 78 face each other).

  In the configuration example shown in FIGS. 7 and 8, the rotor winding 30 is electrically connected to the power transmission rotor winding 80, so that the rotor is caused by the rotational difference between the input side rotor 28 and the output side rotor 18. The induced current generated in the winding 30 also flows in the power transmission rotor winding 80, and a rotating magnetic field is also formed in the power transmission rotor 78 by the induced current flowing in the power transmission rotor winding 80. Then, in response to the rotating magnetic field generated in the power transmission rotor winding 80 acting on the power transmission stator 66, an induced electromotive force is generated in the power transmission stator winding 70, resulting from this induced electromotive force. Thus, an induced current flows through the power transmission stator winding 70. The AC power generated in the power transmission stator winding 70 is supplied to the rectifier 93 and rectified to DC. Further, due to the electromagnetic interaction between the rotating magnetic field generated in the power transmission rotor winding 80 and the induced current flowing in the power transmission stator winding 70, torque is generated between the power transmission stator 66 and the power transmission rotor 78. Works. The torque acting between the power transmission stator 66 and the power transmission rotor 78 is in the same direction as the torque acting between the input side rotor 28 and the output side rotor 18. As described above, the power transmission rotor winding 80 and the power transmission stator winding 70 are electromagnetically coupled, so that the power transmission stator 66 and the power transmission rotor 78 can function as a transformer. The AC power generated in the rotor winding 30 can be taken out without contact. Furthermore, the power transmission stator 66 and the power transmission rotor 78 can function as an induction machine. In the present embodiment, the AC power generated in the rotor winding 30 can be reduced by configuring the power transmission stator 66 and the power transmission rotor 78 to function only as a transformer without functioning as an induction machine. It can be taken out by contact.

  7 and 8, the rotating direction of the rotating magnetic field generated when an alternating current flows through the rotor winding 30 and the power transmission rotor winding 80 is the rotor winding 30 and the power transmission rotor winding. The rotor winding 30 and the power transmission rotor winding 80 can also be connected in phase so that they are in the same direction. For example, when both the rotor winding 30 and the power transmission 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 rotor winding 80 for power transmission, the V phase of the rotor winding 30 is connected to the V phase of the rotor winding 80 for power transmission, and the W phase of the rotor winding 30 is connected to the power transmission. By connecting the W phase of the rotor winding 80 (connecting windings of the same phase for all phases), the rotation direction of the magnetic field generated by the rotor winding 30 and the power transmission rotor winding 80 can be changed. They are in the same direction. In this case, the number of poles P2 of the power transmission rotor 78 is set to be equal to or greater than the number of poles P1 of the input side rotor 28 (P2 ≧ P1), so The torque to be applied is in the same direction as the torque acting between the input side rotor 28 and the output side rotor 18.

  In the above description, the step-up converter 94 is provided as a DC-DC converter that converts the voltage rectified by the rectifier 93 and outputs the voltage. However, in this embodiment, a step-down converter or a step-up / down converter is used as the DC-DC converter. It is also possible to provide.

  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 second rotor 18 may be mechanically connected to the engine 36 and the first rotor 28 may be mechanically connected to the wheels 38 via the transmission 44. In this case, the power from the engine 36 is transmitted to the second rotor 18, and the power from the first rotor 28 is shifted by the transmission 44 and transmitted to the wheels 38, so that the second rotor 18 serves as the input-side rotor. The first rotor 28 becomes the 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.

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. FIG. 3 is a diagram illustrating a configuration example of an input side rotor 28, an output side rotor 18, and a stator 16. FIG. 3 is a diagram illustrating a configuration example for cooling an input side rotor 28 and a stator 16. It is a figure which shows the other structural example for cooling the input side rotor 28 and the stator 16. 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 an example of the connection of the rotor coil | winding 30 and the rotor coil | winding 80 for electric power transmission. It is a figure which shows the structural example of the rotor 78 for electric power transmission, and the stator 66 for electric power transmission. It is a figure which shows the other example of the connection of the rotor coil | winding 30 and the rotor coil | winding 80 for electric power transmission.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machine, 16 Stator, 18 Output side rotor (2nd rotor), 20 Stator winding, 24 Output shaft, 28 Input side rotor (1st rotor), 30 Rotor winding, 32, 33 Permanent magnet, 34 Input shaft 36 Engine, 38 Wheel, 40 Inverter, 42 Power storage device, 44 Transmission, 48 Clutch, 50 Electronic control unit, 54 Air inlet, 55 Ventilation blade, 56 Air outlet, 57,58 Air passage, 66 For power transmission Stator, 70 Power transmission stator winding, 78 Power transmission rotor, 80 Power transmission rotor winding, 81 Stator support member, 82, 83 Rotor support member, 93 Rectifier, 94 Boost converter, 95 Slip ring, 96 Brush.

Claims (5)

A first rotor provided with a rotor conductor capable of generating a rotating magnetic field;
A stator provided with a stator conductor capable of generating a rotating magnetic field;
A second rotor that is rotatable relative to the first rotor, wherein torque acts between the first rotor and the stator conductor in response to the rotating magnetic field generated by the rotor conductor. A second rotor in which a torque acts between the stator and the stator according to the action of the generated rotating magnetic field;
A power transmission unit for taking out AC power of the rotor conductor;
With
Power from the prime mover is transmitted to one of the first rotor and the second rotor, and power is transmitted to the load from the other of the first rotor and the second rotor,
The rotor conductor generates a rotating magnetic field by causing an induced current to flow due to a difference in rotation between the first rotor and the second rotor,
AC power taken out by the power transmission unit can be supplied to the stator conductor,
The power transmission device, wherein the stator is disposed radially inside the second rotor, and the first rotor is disposed radially outside the second rotor. The power transmission device according to claim 1,
The power transmission unit is connected to the rotor conductor of the first rotor, and includes a slip ring that rotates with the first rotor while sliding with respect to the brush,
A power transmission device capable of supplying AC power from a brush to a stator conductor. The power transmission device according to claim 1,
The power transmission part
A power transmission rotor coupled to a first rotor, the power transmission rotor being connected to the rotor conductor of the first rotor and capable of generating a rotating magnetic field. When,
A power transmission stator in which a power transmission stator conductor through which an induced current flows due to the generation of a rotating magnetic field in the power transmission rotor conductor;
Including
A power transmission device capable of supplying AC power from a power transmission stator conductor to the stator conductor. The power transmission device according to any one of claims 1 to 3,
A power transmission device further comprising a power conversion unit capable of converting the AC power extracted by the power transmission unit into power and supplying the AC power to the stator conductor. The power transmission device according to claim 4,
The power converter
A rectifier that rectifies the AC power extracted by the power transmission unit;
A DC-DC converter that converts the voltage of the power rectified by the rectifier and outputs the voltage;
Including
A power transmission device in which electric power converted by a DC-DC converter is converted into alternating current by an inverter and can be supplied to a stator conductor.

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