JP2008236962A - Rotating electric machine and hybrid drive device including the same - Google Patents

Abstract

In a rotating electrical machine capable of transmitting torque between a first rotor and a second rotor that can rotate relative to each other, freedom in controlling torque of a first rotor and a second rotor is provided. Increase the degree and realize brushless.
An excitation coil is wound around a rotation direction of a first rotor so as to surround a rotation center axis of the first rotor and is attached to a non-rotating shaft. The first rotor 28 is provided with claw portions 52a and 54a opposite to the second rotor 18 in which magnetic poles alternate in the rotation direction when a current flows through the exciting coil 30. Torque acts between the first rotor 28 and the second rotor 18 in response to the magnetic field formed in the first rotor 28 acting on the second rotor 18 by the current of the exciting coil 30. Torque acts between the stator 16 and the second rotor 18 in response to the magnetic field formed in the stator 16 by the current of the stator winding 20 acting on the second rotor 18.
[Selection] Figure 3

Description

  The present invention relates to a rotating electric machine capable of transmitting torque between a first rotor and a second rotor that can rotate relative to each other, and a hybrid drive apparatus including the rotating electric machine.

  The related art of this type of rotating electrical machine is disclosed in Patent Document 1 below. A rotating electrical machine according to Patent Document 1 includes a stator in which windings are disposed, a first rotor in which windings that are electromagnetically coupled to the stator windings are mechanically connected to an engine (prime mover), A permanent magnet that is electromagnetically coupled to the winding of the first rotor, and a second rotor that is rotatable relative to the first rotor and mechanically connected to a load. In Patent Document 1, the power transmitted from the engine to the first rotor is transmitted to the second rotor by electromagnetic coupling between the windings of the first rotor and the permanent magnets of the second rotor. The load can be driven. Further, by using electromagnetic coupling between the stator winding and the first rotor winding, and electromagnetic coupling between the first rotor winding and the second rotor permanent magnet, the electric power supplied to the stator winding is used. Since power can be generated in the second rotor, the load can be driven even if the engine does not generate power.

JP 2000-197324 A

  In Patent Document 1, the torque of the first rotor and the second rotor can be controlled by controlling the current flowing through the winding of the stator. However, the torque of the first rotor and the second rotor is interlocked with each other. Because they change, these torques cannot be controlled independently. For this reason, the degree of freedom in controlling the torque of the first rotor and the second rotor is reduced. When the second rotor is provided with a winding instead of a permanent magnet, the current flowing in the winding of the second rotor in addition to the current flowing in the winding of the stator is controlled, so that the first rotor and the second rotor The torque can be controlled independently. However, in that case, a slip ring is required to pass a current through the winding of the second rotor. As a result, loss when current flows through the winding of the second rotor increases and maintainability deteriorates.

  Further, in Patent Document 1, in order to control the torque of the first rotor and the second rotor, it is necessary to provide a stator provided with windings. As a result, the configuration of the rotating electrical machine becomes complicated.

  The present invention relates to a rotating electrical machine capable of transmitting torque between a first rotor and a second rotor that can rotate relative to each other, and controls torque of the first rotor and the second rotor. One of the purposes is to increase the degree of freedom and realize brushless.

  Another object of the present invention is to simplify the configuration and realize brushless in a rotating electrical machine capable of transmitting torque between a first rotor and a second rotor that can rotate relative to each other. One.

  The rotating electrical machine and the hybrid drive apparatus including the same according to the present invention employ the following means in order to achieve at least a part of the above-described object.

  A rotating electrical machine according to the present invention includes a first rotor, an excitation conductor that forms a magnetic field in the first rotor in response to current flow, and a second rotor that can rotate relative to the first rotor. A second rotor in which a torque acts between the first rotor and a stator capable of generating a magnetic field, wherein the magnetic field formed in the first rotor acts on the first rotor. A stator capable of applying torque to the second rotor by acting on the second rotor, and the excitation conductor is attached to a restraining member whose rotation is restrained. To do.

  According to the present invention, the torque acting between the first rotor and the second rotor and the torque acting between the stator and the second rotor can be controlled independently. While transmitting torque between the first rotor and the second rotor, the torque of the first rotor and the torque of the second rotor can be controlled independently. Further, since the rotation of the exciting conductor is restricted by being attached to the restraining member, a slip ring (brush) is not required when a current is passed through the exciting conductor. Accordingly, it is possible to increase the degree of freedom when controlling the torque of the first rotor and the second rotor, and it is possible to realize a brushless rotating electric machine.

  In one aspect of the present invention, the excitation conductor is an excitation coil wound along the rotation direction of the first rotor so as to surround the rotation axis of the first rotor, and the first rotor includes the excitation coil It is preferable that a claw pole portion, in which magnetic poles alternate in the rotation direction when a current flows through the coil, is disposed to face the second rotor.

  In one aspect of the present invention, the second rotor is provided with a magnet facing the first rotor, and the interaction between the magnetic field formed in the first rotor and the magnetic field generated by the magnet is provided. Thus, it is preferable that a torque acts between the first rotor and the second rotor. In one aspect of the present invention, the second rotor is provided with an inductive conductor through which an induced current flows according to a change in a magnetic field applied from the first rotor, facing the first rotor. Is preferred. In one embodiment of the present invention, the second rotor may be a rotor in which reluctance torque acts between the first rotor and the first rotor in response to a magnetic field formed in the first rotor. Is preferred. In one aspect of the present invention, the second rotor is provided with a magnet facing the first rotor, and the second rotor includes a magnetic field formed on the first rotor and the magnet. Magnet torque acts between the first rotor and the reluctance torque between the first rotor and the magnetic field formed on the first rotor by the interaction with the magnetic field generated by the first rotor. It is preferable that the rotor acts.

  In one aspect of the present invention, a magnet is disposed on the second rotor so as to face the stator, and the second rotor is generated by the interaction between the magnetic field generated by the stator and the magnetic field generated by the magnet. It is preferable that a torque acts on. In one aspect of the present invention, it is preferable that the second rotor is provided with an induction conductor through which an induced current flows according to a change in a magnetic field acting from the stator, facing the stator. . In the aspect of the invention, it is preferable that the second rotor is a rotor on which a reluctance torque acts in response to a magnetic field generated by the stator acting. In one embodiment of the present invention, the second rotor is provided with a magnet facing the stator, and the second rotor includes a magnetic field generated by the stator and a magnetic field generated by the magnet. It is preferable that the rotor is a rotor in which reluctance torque acts in accordance with the magnetic torque generated by the interaction and the magnetic field generated by the stator.

  The rotating electrical machine according to the present invention includes a first rotor, an excitation conductor that forms a magnetic field in the first rotor in response to current flowing, and a second rotor that can rotate relative to the first rotor. A second rotor in which torque acts between the first rotor in response to the magnetic field formed in the first rotor, and a stator capable of generating a magnetic field, And a stator capable of applying a torque to the first rotor by applying a magnetic field to the first rotor, wherein the excitation conductor is attached to the stator.

  According to the present invention, the torque acting between the first rotor and the second rotor and the torque acting between the stator and the first rotor can be controlled independently. While transmitting torque between the first rotor and the second rotor, the torque of the first rotor and the torque of the second rotor can be controlled independently. Furthermore, since the excitation conductor is attached to the stator and its rotation is restricted, a slip ring is not required when a current is passed through the excitation conductor. Accordingly, it is possible to increase the degree of freedom when controlling the torque of the first rotor and the second rotor, and it is possible to realize a brushless rotating electric machine.

  The rotating electrical machine according to the present invention includes a first rotor, an excitation conductor that forms a magnetic field in the first rotor in response to current flowing, and a second rotor that can rotate relative to the first rotor. And a second rotor in which torque acts between the first rotor and the magnetic field formed in the first rotor, and the excitation conductor is restrained from rotating. The gist is attached to the restraining member.

  According to the present invention, by controlling the current flowing through the exciting conductor, it is possible to control the torque acting between the first rotor and the second rotor without providing a stator. Further, since the rotation of the excitation conductor is restricted, a slip ring is not required when a current is passed through the excitation conductor. Therefore, the configuration of the rotating electrical machine can be simplified and the brushless of the rotating electrical machine can be realized.

  The hybrid drive device according to the present invention includes the rotating electrical machine according to the present invention, and an engine that is coupled to one of the first rotor and the second rotor and is capable of generating power, the first rotor, The gist is that power can be output from an output shaft connected to the other of the second rotors.

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

“Embodiment 1”
1-4 is a figure which shows the outline of a structure of the hybrid drive device provided with the rotary electric machine which concerns on Embodiment 1 of this invention, FIG. 1 shows the outline of the whole structure, FIGS. The outline of a structure is shown. 2 shows a part of the internal configuration of the rotating electrical machine 10 as viewed from the axial direction, FIG. 3 shows a cross-sectional view along AA in FIG. 2, and FIG. 4 shows a cross-sectional view along BB in FIG. However, the configuration of the part not shown in FIG. 2 is the same as the illustrated part. The hybrid drive device according to the present embodiment includes an engine (internal combustion engine) 36 capable of generating power, and a rotating electrical machine 10 provided between the engine 36 and wheels 38. In addition, about the hybrid drive device which concerns on this embodiment, it can be used as a power output device for driving a vehicle, for example.

  The rotating electrical machine 10 includes a stator (stator) 16 fixed to a casing (not shown), a first rotor (first rotor) 28 that is disposed on the radially inner side of the stator 16 and can rotate relative to the stator 16, and a stator. The second rotor (second rotor) 18 disposed between the stator 16 and the first rotor 28 and rotatable relative to the stator 16 and the first rotor 28, and disposed on the radially inner side of the first rotor 28 to rotate. A non-rotating shaft (restraining member) 17 that is constrained. 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 wheels 38, so that the wheels 38 receive power from the second rotor 18. Power is transmitted.

  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. In the stator core 51, a plurality of teeth 51a projecting radially inward (on the second rotor 18 side) are arranged at intervals along the circumferential direction of the stator 16, and each of the stator windings 20 is formed of these teeth 51a. It is attached to.

  The second rotor 18 includes a plurality of permanent magnets 32 that are arranged along the circumferential direction and generate a field magnetic flux, and is rotatably supported on the non-rotating shaft 17 by a bearing (not shown). The rotation center axis of the second rotor 18 coincides with the center axis of the non-rotation shaft 17. The outer peripheral surface of the second rotor 18 (permanent magnet 32) faces the stator 16 (tooth 51a), and the inner peripheral surface of the second rotor 18 (permanent magnet 32) faces the first rotor 28. The plurality of permanent magnets 32 have alternating magnetic poles in the rotation direction (circumferential direction) of the second rotor 18, that is, “N pole” and “S pole” are alternately arranged on the outer peripheral side and the inner peripheral side of the second rotor 18. It is arranged to line up. The permanent magnet 32 here may be exposed on the surface (outer peripheral surface and inner peripheral surface) of the second rotor 18 as shown in FIGS. 2 to 4 or in the second rotor 18 (in the rotor core). It may be buried. In addition, separate permanent magnets can be disposed on the outer peripheral portion and the inner peripheral portion of the second rotor 18.

  The first rotor 28 includes rotor cores (rotor cores) 52 and 54 and a non-magnetic material (for example, resin) 56 that mechanically connects the rotor cores 52 and 54, and is non-rotated by bearings 62 and 64. The rotary shaft 17 is rotatably supported. The rotation center axis of the first rotor 28 also coincides with the center axis of the non-rotation shaft 17. The rotor cores 52 and 54 are spaced from each other with respect to a direction parallel to the rotation center axis of the first rotor 28 (rotation axis direction), and a groove 55 is formed between the rotor cores 52 and 54 to rotate the first rotor 28. It is formed along the direction. As shown in FIGS. 3 and 5, a plurality of claw portions (claw portions) 52 a protruding to the rotor core 54 side (one side in the rotation axis direction, the lower side in the figure) are provided on the outer peripheral portion of the rotor core 52. The claw portions 52a are opposed to the second rotor 18 (permanent magnet 32). As shown in FIGS. 4 and 5, a plurality of claw portions (claw portions) 54 a protruding toward the rotor core 52 side (the other side in the rotation axis direction, the upper side in the figure) are provided on the outer peripheral portion of the rotor core 54. The claw portions 54a are also opposed to the second rotor 18 (permanent magnet 32). Furthermore, the claw portions 52a and 54a are arranged so as to be alternately arranged in the rotation direction of the first rotor 28 as shown in FIG. Here, FIG. 5 shows a part of the configuration of the first rotor 28 (claw portions 52a and 54a) viewed from the second rotor 18 side (radially outer side). However, FIG. 5 shows the first rotor 28 expanded along the circumferential direction for convenience of explanation, and the configuration of the portion not shown in FIG. 5 is the same as the illustrated portion. It is a configuration.

  The exciting coil (exciting conductor) 30 is wound along the rotation direction (circumferential direction) of the first rotor 28 so as to surround the rotation center axis of the first rotor 28, and is accommodated in the groove 55 between the rotor cores 52, 54. Has been. As the exciting coil 30 here, for example, a single-phase coil can be used. In this embodiment, as shown in FIGS. 3 and 4, the excitation coil 30 is attached to the outer peripheral portion of the non-rotating shaft 17, and the rotation of the excitation coil 30 is restricted. That is, the first rotor 28 (rotor cores 52, 54) rotates relative to the excitation coil 30. Therefore, it is preferable to provide a slight gap between the exciting coil 30 and the rotor cores 52 and 54. Further, a magnetic body (ferromagnetic body) 58 is disposed on the outer peripheral portion of the non-rotating shaft 17 so as to face the rotor cores 52 and 54.

  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 is connected to each phase of the stator winding 20 by, for example, star connection. Inverter 40 converts the DC voltage from power storage device 42 into alternating current (for example, three-phase alternating current having a phase difference of 120 degrees) by switching operation of the switching element, and allows alternating current to flow through each phase of stator winding 20. Is possible. When a plurality of phases (for example, three phases) of alternating current flows through the plurality of phases (for example, three phases) of the stator windings 20, the stator 16 generates a rotating magnetic field that rotates in the circumferential direction. Then, torque (magnet torque) is applied to the second rotor 18 by electromagnetic interaction (attraction and repulsion) between the rotating magnetic field generated in the stator winding 20 and the magnetic field (field magnetic flux) generated in the permanent magnet 32. The second rotor 18 can be driven to rotate. That is, the electric power supplied from the power storage device 42 to the stator winding 20 can be converted into the power (mechanical power) of the second rotor 18. Furthermore, the inverter 40 can convert the alternating current flowing in each phase of the 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 second 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 second rotor 18 are electromagnetically coupled, so that the rotating magnetic field generated by the stator 16 acts on the second rotor 18 to 2 Torque (magnet torque) can be applied to the rotor 18. An example in which a magnetic body (ferromagnetic body) is disposed as a salient pole portion between the permanent magnets 32 arranged along the rotation direction of the second rotor 18 so as to face the stator 16 (the teeth 51a), In the example in which each permanent magnet 32 is embedded in the rotor core of the second rotor 18, the reluctance torque is also added to the stator 16 in addition to the magnet torque in response to the rotating magnetic field generated by the stator 16 acting on the second rotor 18. And the second rotor 18. Further, by controlling the current flowing through each phase of the stator winding 20, the torque acting between the stator 16 and the second rotor 18 can be controlled. 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.

  The inverter 41 includes a switching element (not shown), and is connected to the exciting coil 30 via a lead wire 31 passing through the non-rotating shaft 17. The inverter 41 can convert the direct current voltage from the power storage device 42 into alternating current by the switching operation of the switching element, and allow the alternating current to flow through the exciting coil 30. Further, the inverter 41 can convert the alternating current flowing through the exciting coil 30 into a direct current and convert the electric energy to be regenerated to the power storage device 42. That is, the inverter 41 can also perform bidirectional power conversion, and the power storage device 42 can transmit and receive power to the exciting coil 30. When a current flows through the exciting coil 30, a magnetic field is formed in the first rotor 28 (rotor cores 52 and 54), and the claw portions 52a and 54a are magnetized to function as magnetic poles. For example, when the direction of the current flowing through the exciting coil 30 is the direction shown in FIGS. On the other hand, when the direction of the current flowing through the exciting coil 30 is the direction shown in FIGS. That is, “N pole” and “S pole” are alternately arranged in the rotation direction of the first rotor 28 (the magnetic poles are alternately), and the magnetic poles of the claw portions 52 a and 54 a are switched according to the direction of the current flowing through the exciting coil 30. . Then, due to the electromagnetic interaction (attraction and repulsion) between the magnetic field formed by the exciting coil 30 in the first rotor 28 and the magnetic field (field magnetic flux) generated by the permanent magnet 32, the first rotor 28 and the second rotor 18. Torque acts between them. In this way, the exciting coil 30 and the permanent magnet 32 are electromagnetically coupled, so that the magnetic field formed in the first rotor 28 by the exciting coil 30 acts on the second rotor 18 according to the first magnetic field. Torque (magnet torque) acts between the first rotor 28 and the second rotor 18. A magnetic material (ferromagnetic material) is disposed as a salient pole portion between the permanent magnets 32 arranged along the rotation direction of the second rotor 18 so as to face the first rotor 28 (claw portions 52a, 54a). In the example in which each permanent magnet 32 is embedded in the rotor core of the second rotor 18, the magnet torque is increased according to the magnetic field formed in the first rotor 28 acting on the second rotor 18. In addition, reluctance torque also acts between the first rotor 28 and the second rotor 18. Furthermore, the torque acting between the first rotor 28 and the second rotor 18 can be controlled by controlling the current flowing through the exciting coil 30. The first rotor 28 is a claw pole type rotor, and a claw pole is formed by claw portions 52a and 54a disposed on the rotor cores 52 and 54 so as to face the second rotor 18 (permanent magnet 32).

  The electronic control unit 50 controls the torque that acts between the stator 16 and the second rotor 18 by controlling the switching operation of the switching element of the inverter 40 and controlling the current that flows through each phase of the stator winding 20. To do. And the electronic control unit 50 controls the torque which acts between the 1st rotor 28 and the 2nd rotor 18 by controlling the switching operation | movement of the switching element of the inverter 41, and controlling the electric current sent through the exciting coil 30. To do. Further, the electronic control unit 50 also controls the operating state of the engine 36.

  In the present embodiment, when the load is driven using the power of the engine 36 (the wheel 38 is rotationally driven), the electronic control unit 50 controls the switching operation of the inverter 41 to control the current flowing through the excitation coil 30. To do. When the engine 36 is rotationally driven, the first rotor 28 connected to the engine 36 is rotationally driven, and the claw portions 52a and 54a of the first rotor 28 form a rotating magnetic field. Due to the attraction and repulsion of the rotating magnetic field and the field magnetic flux of the permanent magnet 32, torque acts on the second rotor 18 and the wheel 38 connected to the second rotor 18 is rotationally driven. Thus, the power from the engine 36 transmitted to the first rotor 28 is transmitted to the second rotor 18 by the electromagnetic coupling between the exciting coil 30 and the permanent magnet 32, and is output from the output shaft 24 to the wheel 38. The wheels 38 can be driven to rotate (drive the load) using the power of the engine 36. In that case, since the power can be transmitted by a path not via the inverters 40 and 41 using the electromagnetic coupling between the exciting coil 30 and the permanent magnet 32, the power transmission efficiency can be improved. Further, the torque transmitted from the first rotor 28 to the second rotor 18 can be controlled by controlling the current flowing through the exciting coil 30. In addition, since the rotation difference of the 1st rotor 28 and the 2nd rotor 18 can be accept | permitted, even if rotation of the wheel 38 stops, the engine 36 does not stall.

  Further, in the present embodiment, the electronic control unit 50 controls the torque of the second rotor 18 by controlling the switching operation of the switching element of the inverter 40 and controlling the current flowing through each phase of the stator winding 20. And drive control of the load can be performed. For example, the electronic control unit 50 can form a rotating magnetic field in the stator 16 by controlling the switching operation of the inverter 40 so as to supply power from the power storage device 42 to the stator winding 20. The torque can be applied to the second rotor 18 by the attraction and repulsion action of the rotating magnetic field generated by the stator winding 20 and the field magnetic flux generated by the permanent magnet 32, and the second rotor 18 is driven to rotate. be able to. As described above, the power supplied to the stator winding 20 is converted into power (mechanical power) of the second rotor 18 by electromagnetic coupling between the stator winding 20 and the permanent magnet 32. Accordingly, the wheel 38 can be rotationally driven using the power of the engine 36 and the rotational driving of the wheel 38 can be assisted by the power of the second rotor 18 generated using the power supplied to the stator winding 20. On the other hand, 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, thereby rotating the wheels 38 using the power of the engine 36 and the engine 36. A part of the motive power can be converted into electric power of the stator winding 20 by the electromagnetic coupling between the stator winding 20 and the permanent magnet 33 and recovered in the power storage device 42. When there is a difference between the power of engine 36 and the power transmitted to wheel 38, the difference is absorbed by charging or discharging of power storage device 42.

  In the present embodiment described above, since the current flowing through the exciting coil 30 and the current flowing through the stator winding 20 can be controlled independently, the torque acting between the first rotor 28 and the second rotor 18, The torque acting between the stator 16 and the second rotor 18 can be controlled independently. As a result, it is possible to independently control the torque of the first rotor 28 and the torque of the second rotor 18 while performing torque transmission between the first rotor 28 and the second rotor 18. The degree of freedom in controlling the torque and the torque of the second rotor 18 can be increased. Further, since the excitation coil 30 is attached to the non-rotating shaft 17 and its rotation is restricted, a slip ring (brush) is not required when a current is passed through the excitation coil 30. Therefore, it is possible to realize the brushless of the rotating electrical machine 10. As a result, it is possible to reduce a loss when a current flows through the exciting coil 30 and to improve maintainability of the rotating electrical machine 10.

  Furthermore, in this embodiment, the wheel 38 is controlled by independently controlling the torque acting between the first rotor 28 and the second rotor 18 and the torque acting between the stator 16 and the second rotor 18. (The torque of the second rotor 18) and the rotational speed of the engine 36 (rotational speed of the first rotor 28) can be controlled independently. Therefore, the engine 36 is maintained such that the rotational speed and torque of the engine 36 are located on the optimum fuel consumption line of the engine 36 shown in FIG. 10 (the line connecting the points where the efficiency is highest for the given engine power). In addition to performing the operation control 36, the torque of the second rotor 18 can be controlled so that the power transmitted to the wheels 38 matches the vehicle required power (for example, set based on the accelerator opening and the vehicle speed). At that time, the ratio between the rotational speed of the engine 36 (rotational speed of the first rotor 28) and the rotational speed of the wheels 38 (rotational speed of the second rotor 18) can be continuously changed. A continuously variable transmission function can be realized.

  Further, in the present embodiment, EV (Electric Vehicle) traveling can be performed in which a load is driven using the power of the rotating electrical machine 10 (the wheel 38 is rotationally driven) without using the power of the engine 36. When performing this EV traveling, the electronic control unit 50 controls the switching operation of the inverter 40 to thereby control the driving of the load. 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 second rotor 18 by the electromagnetic coupling, and the wheel 38 is rotationally driven. Thus, even if the engine 36 does not generate power, the wheels 38 can be rotationally driven by supplying power to the 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 stator winding 20 to the power storage device 42 during the deceleration operation of the load. The electric power of the stator winding 20 can be converted by the electromagnetic coupling with the magnet 32 and collected in the power storage device 42.

  However, in the present embodiment, the switching operation of the inverter 41 can be controlled when performing EV traveling. For example, the electronic control unit 50 controls the switching operation of the inverter 41 so that power is supplied from the power storage device 42 to the excitation coil 30, thereby supplying the supply power to the excitation coil 30 between the excitation coil 30 and the permanent magnet 32. The wheel 38 can be rotationally driven by being converted into the power of the second rotor 18 by the coupling. In addition, the electronic control unit 50 can also control the switching operation of the inverter 41 so that power is recovered from the exciting coil 30 to the power storage device 42 during the deceleration operation of the load. In this case, the power of the load is converted into electric power of the exciting coil 30 by electromagnetic coupling between the exciting coil 30 and the permanent magnet 32 and collected in the power storage device 42.

“Embodiment 2”
FIGS. 11 to 13 are diagrams showing an outline of a configuration of a hybrid drive device including a rotating electrical machine according to the second embodiment of the present invention, and FIG. 11 shows a part of an internal configuration viewed from the axial direction of the rotating electrical machine 10. 12 shows an AA sectional view of FIG. 11, and FIG. 13 shows a BB sectional view of FIG. In the following description of the second embodiment, the same or corresponding components as those in the first embodiment are denoted by the same reference numerals, and redundant descriptions are omitted.

  In the present embodiment, the second rotor 18 is a squirrel-cage rotor, and a squirrel-cage winding (induction conductor) 62 is disposed on the outer periphery of the second rotor 18 so as to face the stator 16 (the teeth 51a). A squirrel-cage winding (induction conductor) 63 is disposed on the inner peripheral portion of the second rotor 18 so as to face the first rotor 28 (claw portions 52a and 54a). However, the cage windings 62 and 63 can be shared.

  Also in this embodiment, when the wheels 38 are rotationally driven using the power of the engine 36, the electronic control unit 50 controls the current that flows through the exciting coil 30. When the engine 36 is driven to rotate, the claw portions 52a and 54a of the first rotor 28 form a rotating magnetic field, and this rotating magnetic field acts on the car-shaped winding 63 of the second rotor 18 so that the car is moved from the first rotor 28 to the car. The magnetic field acting on the mold winding 63 varies. In response to the fluctuation of the magnetic field, an induction current is generated in the squirrel-cage winding 63, and torque is applied between the first rotor 28 and the second rotor 18 due to the induction current and the rotating magnetic field of the first rotor 28, so 2 The rotor 18 (wheel 38) is rotationally driven. Thus, the power from the engine 36 transmitted to the first rotor 28 is transmitted to the second rotor 18 (wheel 38) by electromagnetic coupling between the exciting coil 30 and the cage winding 63.

  Furthermore, also in the present embodiment, a rotating magnetic field can be formed in the stator 16 by passing a current through the stator winding 20. When the rotating magnetic field generated by the stator 16 acts on the cage winding 62 of the second rotor 18, the magnetic field acting on the cage winding 62 from the stator 16 varies. An induced current is generated in the squirrel-cage winding 62 in response to the fluctuation of the magnetic field. Torque can also be applied to the second rotor 18 by this induced current and the rotating magnetic field of the stator 16, and the second rotor 18 can be driven to rotate. Therefore, EV traveling can be performed by supplying power to the stator winding 20. The electric power supplied to the stator winding 20 is converted into the power of the second rotor 18 by electromagnetic coupling between the stator winding 20 and the cage winding 62. However, EV traveling can also be performed by supplying power to the exciting coil 30.

  In the present embodiment, as in the first embodiment, the degree of freedom in controlling the torque of the first rotor 28 and the torque of the second rotor 18 can be increased, and the rotating electrical machine 10 can be made brushless. . When the wheels 38 are rotationally driven using the power of the engine 36, the engine 36 is controlled so that the rotational speed and torque of the engine 36 are located on the optimum fuel consumption line of the engine 36, and the wheels are controlled. The torque of the second rotor 18 can be controlled so that the power transmitted to the vehicle 38 matches the vehicle required power.

“Embodiment 3”
14-16 is a figure which shows the outline of a structure of the hybrid drive device provided with the rotary electric machine which concerns on Embodiment 3 of this invention, and FIG. 14 shows a part of internal structure seen from the axial direction of the rotary electric machine 10. FIG. 15 is a cross-sectional view taken along the line AA in FIG. 14, and FIG. 16 is a cross-sectional view taken along the line BB in FIG. In the following description of the third embodiment, the same or corresponding components as those of the first and second embodiments are denoted by the same reference numerals, and redundant description is omitted.

  In the present embodiment, the second rotor 18 is made of a soft magnetic material. A plurality of salient pole portions 72 are arranged at intervals along the rotation direction (circumferential direction) on the outer peripheral portion of the second rotor 18, and each salient pole portion 72 faces the stator 16 (the teeth 51 a). is doing. Therefore, the magnetic resistance (reluctance) of the second rotor 18 with respect to the stator 16 changes according to the rotation direction (circumferential direction) of the second rotor 18. A plurality of salient pole portions 73 are arranged at intervals along the rotation direction (circumferential direction) on the inner peripheral portion of the second rotor 18, and each salient pole portion 73 corresponds to the first rotor 28 ( It faces the claw portions 52a, 54a). Therefore, the magnetic resistance of the second rotor 18 with respect to the first rotor 28 changes according to the rotation direction of the second rotor 18. However, the magnetic resistance of the second rotor 18 can be changed in accordance with the rotational direction by forming a slit (gap) in the second rotor 18.

  Also in this embodiment, when the wheels 38 are rotationally driven using the power of the engine 36, the electronic control unit 50 controls the current that flows through the exciting coil 30. When the engine 36 is driven to rotate, the claw portions 52 a and 54 a of the first rotor 28 form a rotating magnetic field, and this rotating magnetic field acts on the second rotor 18. The second rotor 18 tries to rotate in a direction in which the magnetic flux easily passes in response to the magnetic field from the first rotor 28 acting. As a result, reluctance torque acts between the first rotor 28 and the second rotor 18 to drive the second rotor 18 to rotate.

  Furthermore, also in the present embodiment, a rotating magnetic field can be formed in the stator 16 by passing a current through the stator winding 20. As the rotating magnetic field generated by the stator 16 acts on the second rotor 18, the second rotor 18 tries to rotate in a direction in which the magnetic flux can easily pass. Also by this, the reluctance torque can be applied to the second rotor 18, and the second rotor 18 can be rotationally driven. Therefore, EV traveling can be performed by supplying power to the stator winding 20. However, EV traveling can also be performed by supplying power to the exciting coil 30.

  In the present embodiment, as in the first and second embodiments, the degree of freedom in controlling the torque of the first rotor 28 and the torque of the second rotor 18 can be increased, and the brushless motor 10 can be realized. Can do. When the wheels 38 are rotationally driven using the power of the engine 36, the engine 36 is controlled so that the rotational speed and torque of the engine 36 are located on the optimum fuel consumption line of the engine 36, and the wheels are controlled. The torque of the second rotor 18 can be controlled so that the power transmitted to the vehicle 38 matches the vehicle required power.

  In the first to third embodiments described above, one or more of the permanent magnet 32, the cage winding 62, and the salient pole portion 72 are opposed to the stator 16 (the teeth 51a) on the outer peripheral portion of the second rotor 18. It can also be arranged. Further, at least one of the permanent magnet 32, the cage winding 63, and the salient pole portion 73 is opposed to the first rotor 28 (claw portions 52a, 54a) on the inner peripheral portion of the second rotor 18. It can also be arranged.

  In the first to third embodiments, the stator 16 and the inverter 40 can be omitted. Even when the stator 16 and the inverter 40 are omitted, the power from the engine 36 transmitted to the first rotor 28 can be transmitted to the second rotor 18 (wheels 38) by controlling the current flowing through the exciting coil 30. it can. Then, by controlling the switching operation of the inverter 41 so that electric power is supplied from the power storage device 42 to the exciting coil 30, the second rotor 18 can be rotationally driven even when the engine 36 is not generating power. By omitting the stator 16 and the inverter 40, the configuration of the rotating electrical machine 10 can be simplified and the brushless of the rotating electrical machine 10 can be realized.

  In the first to third embodiments, the input shaft 34 and the output shaft 24 of the rotating electrical machine 10 can be interchanged. That is, the second rotor 18 can be connected to the engine 36 and the first rotor 28 can be connected to the wheels 38. Also in this case, by controlling the current flowing through the exciting coil 30, the power from the engine 36 transmitted to the second rotor 18 can be transmitted to the first rotor 28 (wheels 38).

“Embodiment 4”
FIGS. 17-21 is a figure which shows the outline of a structure of the hybrid drive device provided with the rotary electric machine which concerns on Embodiment 4 of this invention, and FIG. 17 shows a part of internal structure seen from the axial direction of the rotary electric machine 10. FIG. 18 is a cross-sectional view taken along the line AA in FIG. 17, FIG. 19 is a cross-sectional view taken along the line BB in FIG. 17, and FIG. FIG. 21 shows a part of the configuration of the first rotor 28 as viewed from the second rotor 18 side (inside in the radial direction). However, FIGS. 20 and 21 show the first rotor 28 developed along the circumferential direction for convenience of explanation. In the following description of the fourth embodiment, the same or corresponding components as those in the first to third embodiments are denoted by the same reference numerals, and redundant description is omitted.

  In the present embodiment, the first rotor 28 is disposed between the stator 16 and the second rotor 18. The second rotor 18 is mechanically coupled to the input shaft 34 of the rotating electrical machine 10, so that power from the engine 36 is transmitted to the second rotor 18. On the other hand, the first rotor 28 is mechanically coupled to the output shaft 24 of the rotating electrical machine 10, so that power from the first rotor 28 is transmitted to the wheels 38. A plurality of permanent magnets 32 are arranged along the circumferential direction of the outer periphery of the second rotor 18, and each permanent magnet 32 faces the first rotor 28. The permanent magnet 32 here may also be exposed on the surface (outer peripheral surface) of the second rotor 18 as shown in FIGS. 17 to 19 or embedded in the second rotor 18 (in the rotor core). Also good.

  As shown in FIGS. 18 and 20, a plurality of salient pole portions 82 are arranged at intervals along the rotation direction (circumferential direction) on the outer peripheral portion of the rotor core 52 of the first rotor 28. The pole portion 82 faces the stator 16 (the teeth 51a). Further, as shown in FIGS. 19 and 20, a plurality of salient pole portions 83 are arranged at intervals along the rotation direction on the outer peripheral portion of the rotor core 54 of the first rotor 28. 83 also faces the stator 16. Therefore, the magnetic resistance of the first rotor 28 with respect to the stator 16 changes according to the rotation direction of the first rotor 28.

  As shown in FIGS. 18 and 21, a plurality of claw portions 52 a protruding to the rotor core 54 side (one side in the rotation axis direction, the lower side in the figure) are provided on the inner peripheral portion of the rotor core 52 in the rotation direction of the first rotor 28. The claw portions 52a are opposed to the second rotor 18 (permanent magnet 32). 19 and 21, a plurality of claw portions 54 a projecting to the rotor core 52 side (the other side in the rotation axis direction, the upper side in the drawing) are rotated on the inner peripheral portion of the rotor core 54. The claw portions 54a are also opposed to the second rotor 18 (permanent magnet 32). Furthermore, the claw portions 52a and 54a are arranged so as to be alternately arranged in the rotation direction of the first rotor 28, as shown in FIG. These claw portions 52a and 54a form a claw pole in which magnetic poles alternate in the rotation direction of the first rotor 28.

  In the present embodiment, the exciting coil 30 for forming a magnetic field in the first rotor 28 is accommodated in a space formed between the salient pole portions 82 and 83. As shown in FIGS. 18 and 19, the excitation coil 30 is attached to the inner peripheral portion (tip portion of the teeth 51 a) of the stator 16, so that its rotation is restricted.

  Also in this embodiment, when the wheels 38 are rotationally driven using the power of the engine 36, the electronic control unit 50 controls the current that flows through the exciting coil 30. When the engine 36 is driven to rotate, the permanent magnet 32 of the second rotor 18 connected to the engine 36 forms a rotating magnetic field, and this rotating magnetic field acts on the first rotor 28. Further, when a current flows through the exciting coil 30, the claw portions 52 a and 54 a of the first rotor 28 form a magnetic field, and this magnetic field acts on the second rotor 18. Then, due to the attraction and repulsion of the magnetic field of the claw portions 52 a and 54 a and the magnetic field of the permanent magnet 32, torque (magnet torque) acts between the first rotor 28 and the second rotor 18, The connected wheel 38 is rotationally driven. Further, a magnetic material (ferromagnetic material) is disposed as a salient pole portion between the permanent magnets 32 arranged along the rotation direction of the second rotor 18 so as to face the first rotor 28 (claw portions 52a and 54a). In the example in which each permanent magnet 32 is embedded in the rotor core of the second rotor 18, the magnet torque is increased according to the magnetic field formed in the first rotor 28 acting on the second rotor 18. In addition, reluctance torque also acts between the first rotor 28 and the second rotor 18.

  Furthermore, also in the present embodiment, a rotating magnetic field can be formed in the stator 16 by passing a current through the stator winding 20. In response to the rotating magnetic field generated by the stator 16 acting on the first rotor 28, the first rotor 28 tends to rotate in a direction in which the magnetic flux easily passes. Also by this, torque (reluctance torque) can be applied to the first rotor 28, and the first rotor 28 can be rotationally driven. Therefore, EV traveling can be performed by supplying power to the stator winding 20. However, EV traveling can also be performed by supplying power to the exciting coil 30.

  In the present embodiment described above, by controlling the current flowing through the exciting coil 30 and the current flowing through the stator winding 20, the torque acting between the first rotor 28 and the second rotor 18 and the stator 16 and the first The torque acting between one rotor 28 can be controlled independently. As a result, it is possible to independently control the torque of the first rotor 28 and the torque of the second rotor 18 while performing torque transmission between the first rotor 28 and the second rotor 18. The degree of freedom in controlling the torque and the torque of the second rotor 18 can be increased. Further, since the excitation coil 30 is attached to the stator 16 and its rotation is restricted, a slip ring is not required when a current is passed through the excitation coil 30, and the brushless electric machine 10 can be realized. it can. When the wheels 38 are rotationally driven using the power of the engine 36, the engine 36 is controlled so that the rotational speed and torque of the engine 36 are located on the optimum fuel consumption line of the engine 36, and the wheels are controlled. The torque of the first rotor 28 can be controlled so that the power transmitted to the vehicle 38 matches the vehicle required power.

  In the fourth embodiment, any one or more of the permanent magnet 32, the squirrel-cage winding, and the salient pole portion are opposed to the first rotor 28 (claw portions 52a and 54a) on the outer peripheral portion of the second rotor 18. It can also be arranged. In addition, any one or more of a permanent magnet, a squirrel-cage winding, and salient pole portions 82 and 83 may be disposed on the outer peripheral portion of the first rotor 28 so as to face the stator 16 (the teeth 51a). .

  Also in the fourth embodiment, the input shaft 34 and the output shaft 24 of the rotating electrical machine 10 can be interchanged. That is, the first rotor 28 can be connected to the engine 36 and the second rotor 18 can be connected to the wheels 38. Also in this case, by controlling the current flowing through the exciting coil 30, the power from the engine 36 transmitted to the first rotor 28 can be transmitted to the second rotor 18 (wheel 38).

  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 the outline of a structure of a hybrid drive device provided with the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure which shows the outline of a structure of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure which shows the outline of a structure of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure which shows the outline of a structure of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure which shows the outline of a structure of the rotary electric machine which concerns on Embodiment 1 of this invention. It is a figure explaining the magnetic pole formed in a 1st rotor by sending an electric current through an exciting coil. It is a figure explaining the magnetic pole formed in a 1st rotor by sending an electric current through an exciting coil. It is a figure explaining the magnetic pole formed in a 1st rotor by sending an electric current through an exciting coil. It is a figure explaining the magnetic pole formed in a 1st rotor by sending an electric current through an exciting coil. It is a figure explaining the optimal fuel consumption line of an engine. It is a figure which shows the outline of a structure of the rotary electric machine which concerns on Embodiment 2 of this invention. It is a figure which shows the outline of a structure of the rotary electric machine which concerns on Embodiment 2 of this invention. It is a figure which shows the outline of a structure of the rotary electric machine which concerns on Embodiment 2 of this invention. It is a figure which shows the outline of a structure of the rotary electric machine which concerns on Embodiment 3 of this invention. It is a figure which shows the outline of a structure of the rotary electric machine which concerns on Embodiment 3 of this invention. It is a figure which shows the outline of a structure of the rotary electric machine which concerns on Embodiment 3 of this invention. It is a figure which shows the outline of a structure of the rotary electric machine which concerns on Embodiment 4 of this invention. It is a figure which shows the outline of a structure of the rotary electric machine which concerns on Embodiment 4 of this invention. It is a figure which shows the outline of a structure of the rotary electric machine which concerns on Embodiment 4 of this invention. It is a figure which shows the outline of a structure of the rotary electric machine which concerns on Embodiment 4 of this invention. It is a figure which shows the outline of a structure of the rotary electric machine which concerns on Embodiment 4 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machinery, 16 Stator, 17 Non-rotating shaft, 18 2nd rotor, 20 Stator winding, 24 Output shaft, 28 1st rotor, 30 Excitation coil, 32 Permanent magnet, 34 Input shaft, 36 Engine, 38 Wheel, 40 , 41 Inverter, 42 Power storage device, 50 Electronic control unit, 52, 54 Rotor core, 52a, 54a Claw portion, 62, 63 Cage winding, 72, 73, 82, 83 Salient pole portion.

Claims (14)

A first rotor;
An exciting conductor that forms a magnetic field in the first rotor in response to current flow;
A second rotor that is rotatable relative to the first rotor, wherein torque is applied to the first rotor in response to a magnetic field formed on the first rotor. When,
A stator capable of generating a magnetic field, the stator capable of applying torque to the second rotor by applying the magnetic field to the second rotor;
With
The excitation conductor is a rotating electrical machine attached to a restraining member whose rotation is restrained. The rotating electrical machine according to claim 1,
The excitation conductor is an excitation coil wound around the rotation direction of the first rotor so as to surround the rotation axis of the first rotor,
A rotating electric machine, wherein a claw pole portion, in which magnetic poles alternate in a rotation direction when a current flows through the exciting coil, is disposed on the first rotor so as to face the second rotor. The rotating electrical machine according to claim 1 or 2,
A magnet is disposed on the second rotor so as to face the first rotor,
A rotating electrical machine in which a torque acts between a first rotor and a second rotor by an interaction between a magnetic field formed on the first rotor and a magnetic field generated by the magnet. The rotating electrical machine according to claim 1 or 2,
A rotating electrical machine in which an induction conductor through which an induced current flows according to a change in a magnetic field applied from the first rotor is disposed opposite to the first rotor. The rotating electrical machine according to claim 1 or 2,
A 2nd rotor is a rotary electric machine which is a rotor with which a reluctance torque acts between the 1st rotor according to the magnetic field formed in the 1st rotor acting. The rotating electrical machine according to claim 1 or 2,
A magnet is disposed on the second rotor so as to face the first rotor,
The second rotor is formed on the first rotor while the magnet torque acts between the first rotor and the magnetic field generated by the magnet by the interaction between the first rotor and the magnetic field generated by the magnet. A rotating electrical machine that is a rotor in which a reluctance torque acts between the first rotor and a magnetic field. The rotating electrical machine according to claim 1 or 2,
The second rotor is provided with a magnet facing the stator,
A rotating electrical machine in which a torque acts on a second rotor by an interaction between a magnetic field generated by a stator and a magnetic field generated by the magnet. The rotating electrical machine according to claim 1 or 2,
A rotating electrical machine in which an induction conductor through which an induced current flows according to a change in a magnetic field applied from a stator is disposed opposite to the stator in the second rotor. The rotating electrical machine according to claim 1 or 2,
A 2nd rotor is a rotary electric machine which is a rotor with which a reluctance torque acts according to the magnetic field which a stator generate | occur | produces acting. The rotating electrical machine according to claim 1 or 2,
The second rotor is provided with a magnet facing the stator,
In the second rotor, the magnet torque acts by the interaction between the magnetic field generated by the stator and the magnetic field generated by the magnet, and the reluctance torque acts in response to the magnetic field generated by the stator. A rotating electric machine that is a child. A first rotor;
An exciting conductor that forms a magnetic field in the first rotor in response to current flow;
A second rotor that is rotatable relative to the first rotor, wherein torque is applied to the first rotor in response to a magnetic field formed on the first rotor. When,
A stator capable of generating a magnetic field, the stator capable of applying torque to the first rotor by applying the magnetic field to the first rotor;
With
The exciting conductor is a rotating electrical machine attached to a stator. The rotating electrical machine according to claim 11,
The excitation conductor is an excitation coil wound around the rotation direction of the first rotor so as to surround the rotation axis of the first rotor,
A rotating electrical machine, wherein a claw pole portion, in which magnetic poles alternate in a rotation direction when a current flows through the exciting coil, is disposed on the first rotor so as to face the second rotor. A first rotor;
An exciting conductor that forms a magnetic field in the first rotor in response to current flow;
A second rotor that is rotatable relative to the first rotor, wherein a torque acts between the first rotor and a magnetic field formed on the first rotor. When,
With
The excitation conductor is a rotating electrical machine attached to a restraining member whose rotation is restrained. The rotating electrical machine according to any one of claims 1 to 13,
An engine connected to one of the first rotor and the second rotor and capable of generating power;
With
A hybrid drive device capable of outputting power from an output shaft connected to the other of the first rotor and the second rotor.

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