Rotating electric machines

Abstract

To provide a rotary electric machine that simultaneously achieves rotor rotation and locking functions without increasing the size of a motor system.SOLUTION: A rotary electric machine system 100 includes a first rotor 16 fixed to a rotating shaft, a second rotor 18 that is divided from the first rotor 16 along the axial direction of the rotating shaft 14 and rotatable relative to the first rotor 16 around the rotating shaft 14, a rotation lock shaft 36 that can be driven in the axial direction within a hollow region provided in the rotating shaft 14, and a locking mechanism 20 that switches the state between a locked state in which the rotating shaft 14 and the second rotor 18 rotate together, and a rotation state in which the second rotor 18 is rotated relative to the rotating shaft 14 by driving the rotation lock shaft 36.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a rotating electric machine. [Background technology]

[0002] Drive motors for vehicles such as automobiles are required to be compact, highly efficient, and have a wide operating range. To reduce size and increase torque at low speeds, the magnetomotive force of the rotor is increased by using powerful magnets in the rotor, for example. However, when a rotor with high magnetomotive force is used, flux-weakening control is required at high speeds, and there is a concern that the increased current associated with this control will reduce motor efficiency.

[0003] To address this issue, motor structures have been proposed in which the rotor is divided in the axial direction to vary the magnetomotive force of the rotor according to the operating conditions (Patent Documents 1 to 5). When torque is required at low speeds, the magnetic poles are aligned in the axial direction (same polarity: a state in which north poles are aligned with north poles and south poles are aligned with south poles), thereby increasing the magnetomotive force. When the magnetomotive force needs to be suppressed at high speeds, the magnetic poles are changed in the axial direction (opposite polarity: a state in which north poles are aligned with south poles). Hereinafter, the state in which the magnetic poles are aligned will be referred to as "same polarity," and the state in which the magnetic poles are oppositely oriented will be referred to as "opposite polarity." Such motor structures require a rotational action to twist the axially divided rotor to switch between same-polarity and opposite-polarity, as well as a locking function to maintain each rotor state in order to operate as a motor with same-polarity and opposite-polarity. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-064942 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-160631 [Patent Document 3] Japanese Patent Application Laid-Open No. 2011-015523 [Patent Document 4] JP 2016-131450 A [Patent Document 5] Japanese Patent Application Publication No. 2017-225231 Summary of the Invention [Problem to be solved by the invention]

[0005] In the technologies of Patent Documents 1 to 3, the rotational movement and the locking function are achieved using the same power source (actuator or oil pump). This requires the addition of a dedicated external actuator or high-pressure oil pump, resulting in an increase in the size of the motor system. In particular, the force (torque) required for the rotational movement is greater than that required for the locking function, so additional components are required to accommodate this. Furthermore, if a locking mechanism is achieved or assisted by a spring, the force required for the rotational movement increases. This further increases the force (torque) required for the rotational movement, resulting in a problem of an even larger motor system.

[0006] In the technology of Patent Document 4, the rotational motion is performed by passing a current through the stator winding, and the locking function is performed by a small electromagnetic clutch. In the technology of Patent Document 5, the rotational motion is performed by passing a current through the stator winding, and a limiter (stopper) function is added to the locking function. These conventional technologies separate the power sources for the rotational motion and the locking function, thereby making the motor system more compact than other conventional structures. However, an additional locking mechanism is provided outside the motor structure, which still results in the problem of the overall motor system being large. Furthermore, a configuration that adds a limiter function to achieve the locking function requires the addition of a position detection sensor. Furthermore, if the response of the locking control is poor, locking may not be possible. [Means for solving the problem]

[0007] One aspect of the present invention is a rotating electric machine comprising a stator and a rotor arranged opposite the stator, wherein the rotor comprises: a first rotor fixed to a rotating shaft; a second rotor separated from the first rotor along the axial direction of the rotating shaft and rotatable relative to the first rotor with the rotating shaft as the center of rotation; a rotary lock shaft that can be driven in the axial direction within a hollow area provided in the rotating shaft; and a lock mechanism that, by driving the rotary lock shaft, switches between a locked state in which the rotating shaft and the second rotor rotate integrally and a rotary state in which the second rotor rotates relative to the rotating shaft.

[0008] Here, it is preferable that the locking mechanism includes a transmission member that can be driven in the radial direction of the rotating shaft in accordance with the movement of the rotating lock shaft, and a groove portion that rotates together with the second rotor and into which the transmission member fits to lock the second rotor and the rotating shaft.

[0009] Preferably, the transmission member is a plurality of balls or pins.

[0010] It is also preferable that the locking mechanism comprises a transmission member that is disposed between the rotating shaft and the second rotor and has both ends that can be driven exclusively in the radial direction of the rotating shaft in accordance with the movement of the rotary lock shaft, and a groove that rotates together with the second rotor and into which the end of the transmission member fits to lock the second rotor and the rotating shaft.

[0011] It is also preferable that the transmission member is a plate-like member that can move like a seesaw relative to the rotation shaft.

[0012] It is also preferable that the locking mechanism comprises: a transmission member that is disposed within the rotating shaft and that can be driven along the radial direction of the rotating shaft in accordance with the movement of the pivot lock shaft; and a groove that rotates together with the second rotor and into which an end of the transmission member fits to lock the second rotor and the rotating shaft.

[0013] Preferably, the transmission member is a transmission plate disposed in a through hole that extends radially through the central axis of the rotation lock shaft.

[0014] It is also preferable to provide an elastic body that biases the rotation lock shaft in the axial direction.

[0015] Preferably, the rotary lock shaft is hydraulically driven. [Effects of the Invention]

[0016] According to the present invention, it is possible to provide a rotating electric machine that simultaneously realizes the rotational movement of the rotor and the locking function without increasing the size of the motor system. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a diagram showing a configuration of a rotating electrical machine system according to an embodiment of the present invention; [Figure 2] FIG. 2 is a cross-sectional view showing the configuration of a rotor according to the first embodiment. [Figure 3] FIG. 2 is a cross-sectional perspective view showing the configuration of a rotor according to the first embodiment. [Figure 4] FIG. 3 is a cross-sectional perspective view illustrating the operation of the rotor in the first embodiment. [Figure 5] FIG. 10 is a cross-sectional perspective view showing the configuration of a rotor according to a second embodiment. [Figure 6] 6A and 6B are cross-sectional views illustrating the operation of the rotor according to the second embodiment. [Figure 7]FIG. 10 is a cross-sectional perspective view illustrating the operation of the rotor in the second embodiment. [Figure 8] FIG. 10 is a cross-sectional perspective view showing the configuration of a rotor according to a third embodiment. [Figure 9] 10A and 10B are cross-sectional views illustrating the operation of the rotor in the third embodiment. [Figure 10] FIG. 11 is a cross-sectional perspective view illustrating the operation of the rotor in the third embodiment. [Figure 11] 10A and 10B are diagrams illustrating a configuration of a transmission plate according to a third embodiment. [Figure 12] FIG. 11 is a cross-sectional perspective view showing a modified example of the configuration of the rotor in the third embodiment. [Figure 13] 10A and 10B are diagrams illustrating changes in the back electromotive force ratio and the torque ratio with respect to the rotation speed in the embodiment of the present invention. [Figure 14] 10A and 10B are diagrams illustrating time-dependent changes in characteristics during a rotation operation according to an embodiment of the present invention. [Figure 15] 5A and 5B are diagrams for explaining timing for switching from a homopolar state to a reverse polarity state in an embodiment of the present invention. [Figure 16] 10A and 10B are diagrams for explaining timing for switching from a reverse polarity state to a homopolarity state in an embodiment of the present invention. [Figure 17] 10A and 10B are diagrams for explaining rotation control in the embodiment of the present invention. [Figure 18] 10A and 10B are diagrams for explaining preferred rotation control in the embodiment of the present invention. [Figure 19] 10 is a flowchart showing transition control from a homopolarity state to a reverse polarity state in an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] [First embodiment] As shown in Fig. 1, a rotating electric machine system 100 according to a first embodiment of the present invention includes a rotating electric machine 102, a drive circuit 104, a power supply 106, and a control device 108. The rotating electric machine system 100 is mounted on, for example, a hybrid vehicle, an electric vehicle, or a fuel cell vehicle. The rotating electric machine system 100 can be used as a motor that generates driving force, and can also be used as a generator or a motor generator that has both the functions of a motor and a generator.

[0019] The rotating electric machine 102 includes a housing 10, a stator 12, a rotating shaft 14, a first rotor 16, a second rotor 18, a locking mechanism 20, a bearing 22, and a locking drive mechanism 24. Note that the bearing 22 may not be provided, and the second rotor 18 may be configured to slide relative to the rotating shaft 14.

[0020] The rotating electric machine 102 generates a driving force for the rotating shaft 14 using electric power supplied from a power source 106 by a drive circuit 104 controlled by a control device 108. The drive circuit 104 also converts the rotational energy given to the rotating shaft 14 into electric power and regenerates it into the power source 106. The drive circuit 104 can be configured to include an inverter that converts the electric power from the power source 106 into AC. The power source 106 can be configured to include a power storage system including, for example, a secondary battery.

[0021] The housing 10 is configured to mechanically support the rotating electric machine 102. The housing 10 houses a stator 12, a rotating shaft 14, a first rotor 16, a second rotor 18, a locking mechanism 20, a bearing 22, and a locking drive mechanism 24.

[0022] The stator 12 includes a stator core and a stator coil. The stator core is a hollow cylindrical member made of a laminate of electromagnetic steel sheets stacked in the axial direction of the rotating shaft 14. However, the material constituting the stator core is not limited to electromagnetic steel sheets, and may be a magnetic material such as amorphous metal, nanocrystalline soft magnetic material, or dust core. The stator coil is a coil arranged in multiple slots on the inner peripheral surface of the stator core. A magnetic field can be generated in the stator coil by passing a current from a power source 106 to the stator coil via a drive circuit 104.

[0023] A first rotor 16 and a second rotor 18 are arranged on the rotating shaft 14 at a distance from each other in the axial direction. In the rotating electric machine system 100 of this embodiment, the second rotor 18 is arranged between the first rotors 16a and 16b, which are divided into two. However, the first rotor 16 and the second rotor 18 are not limited to a three-part structure, and may have any structure as long as they are divided in the axial direction and can rotate relative to each other.

[0024] The first rotors 16a and 16b are fixed to the rotary shaft 14. The second rotor 18 is installed so as to be movable in the rotational direction relative to the rotary shaft 14. That is, the second rotor 18 is rotatable relative to the rotary shaft 14. For example, the second rotor 18 is attached to the rotary shaft 14 via a bearing 22, and is rotatable relative to the rotary shaft 14 by the bearing 22.

[0025] The first rotor 16 (16a, 16b) includes a base fixed to the rotary shaft 14 and a laminate formed by stacking electromagnetic steel sheets in the axial direction on the outer periphery of the base. However, the material constituting the laminate is not limited to electromagnetic steel sheets, and may be a magnetic material such as an amorphous metal, a nanocrystalline soft magnetic material, or a dust core.

[0026] The second rotor 18 includes a laminated body made of electromagnetic steel sheets stacked in the axial direction. However, the material constituting the laminated body is not limited to electromagnetic steel sheets, and may be a magnetic material such as an amorphous metal, a nanocrystalline soft magnetic material, or a dust core.

[0027] In this embodiment, as shown in the cross-sectional view of FIG. 2, magnets 30 are arranged at equal intervals along the circumferential direction on the first rotor 16 and the second rotor 18. For example, eight magnets 30 are arranged so that the north poles and south poles alternate every 45°. Note that FIG. 2 representatively shows the second rotor 18, and the magnetic pole directions of the magnets 30 are indicated by arrows pointing from the south pole to the north pole. The arrangement of the magnets 30 on the first rotor 16 is similar. However, the cross-sectional view of FIG. 2 shows only one example of the arrangement of the magnets 30, and the arrangement of the magnets 30 is not limited to this.

[0028] Furthermore, a locking mechanism 20 is provided for the second rotor 18 so that it can be fixed to the rotating shaft 14. In this embodiment, the locking mechanism 20 is provided between the second rotor 18 and the rotating shaft 14. The locking mechanism 20 is driven by a locking drive mechanism 24 provided inside the rotating shaft 14.

[0029] During normal operation of the rotating electrical machine system 100, the locking mechanism 20 prevents the second rotor 18 from rotating relative to the rotating shaft 14, allowing both the first rotor 16 (16a, 16b) and the second rotor 18 to contribute to the rotation of the rotating shaft 14. On the other hand, during field adjustment, the locking mechanism 20 is released to allow the second rotor 18 to rotate around the rotating shaft 14, and the second rotor 18 is rotated relative to the first rotor 16 (16a, 16b) to adjust its circumferential position, thereby adjusting the field of the rotor as a whole.

[0030] In this configuration, with the locking mechanism 20 in the engaged state and the first rotor 16 (16a, 16b) and the second rotor 18 not rotating relative to the rotating shaft 14 (normal operating state), a rotating magnetic field is formed by passing a current through the stator coil of the stator 12, thereby generating an output torque that rotates the rotating shaft 14 relative to the stator 12. Conversely, the rotational energy of the rotating shaft 14 can be converted into a current flowing through the stator coil of the stator 12 and regenerated.

[0031] Furthermore, by controlling the current flowing through the stator coil of the stator 12 with the locking mechanism 20 in an open state and the second rotor 18 rotatable relative to the rotating shaft 14 (adjustment state), it is possible to adjust the relative phase angle (skew angle) of the magnetic poles of the first rotor 16 (16a, 16b) and the second rotor 18 while generating output torque from the first rotor 16 (16a, 16b) to the rotating shaft 14. It is preferable to use so-called vector control for the current flowing through the stator coil of the stator 12.

[0032] Hereinafter, a state in which the N poles of the first rotors 16a and 16b and the N poles of the second rotor 18 are aligned along the axial direction, and the S poles of the first rotors 16a and 16b and the S poles of the second rotor 18 are aligned along the axial direction, will be referred to as "same poles." Additionally, a state in which the N poles of the first rotors 16a and 16b and the S poles of the second rotor 18 are aligned along the axial direction, and the S poles of the first rotors 16a and 16b and the N poles of the second rotor 18 are aligned along the axial direction will be referred to as "opposite poles."

[0033] 2 and 3, the lock mechanism 20 and the lock drive mechanism 24 according to this embodiment will be described below. The lock mechanism 20 includes a ball 32 and a hub 34. The lock drive mechanism 24 includes a rotating lock shaft 36.

[0034] The rotating shaft 14 has a hollow region 14a extending in the axial direction. The turning lock shaft 36 has a cylindrical shape with a groove 36a on its outer surface. The turning lock shaft 36 is disposed in a region of the hollow region 14a of the rotating shaft 14 that corresponds to the inner circumferential region of the second rotor 18. The turning lock shaft 36 is provided so as to be movable in the axial direction of the rotating shaft 14 (the direction of the arrow in FIG. 3) by an external driving force from an actuator or the like.

[0035] Furthermore, the rotary shaft 14 is provided with through holes 14b in the radial direction at a position corresponding to the movable area of ​​the rotation lock shaft 36, i.e., the inner peripheral area of ​​the second rotor 18. The through holes 14b are provided in at least two locations that are offset a predetermined distance along the circumferential direction. In this embodiment, as shown in FIG. 2, the rotary shaft 14 is configured such that the through holes 14b are provided in eight locations that are equally spaced along the circumferential direction. Furthermore, the through holes 14b that are adjacent along the circumferential direction are provided at positions that are alternately offset along the axial direction of the rotary shaft 14.

[0036] The balls 32 (32a, 32b) are filled in the through holes 14b as transmission members. In this embodiment, an example is shown in which three balls 32 are provided in each through hole 14b. The balls 32 are movable in the radial direction within the through holes 14b. The ball 32 disposed in one of the through holes 14b whose axial positions are offset from each other is referred to as ball 32a, and the ball 32 disposed in the other through hole 14b is referred to as ball 32b.

[0037] The hub 34 is a cylindrical member. The hub 34 is disposed between the ball 32 and the core of the second rotor 18. The outer periphery of the hub 34 is configured to engage with the inner periphery of the second rotor 18, and the hub 34 rotates integrally with the second rotor 18.

[0038] As will be described later, hub grooves 34a into which the balls 32 can fit are provided on the inner periphery of the hub 34. The hub grooves 34a are provided at positions into which the balls 32a fit when the second rotor 18 has the same polarity as the first rotors 16a and 16b, and at positions into which the balls 32b fit when the second rotor 18 has the opposite polarity as the first rotors 16a and 16b.

[0039] 4, the operation of the lock mechanism 20 and the lock drive mechanism 24 in the rotating electrical machine system 100 will be described. Here, the operation when the rotating electrical machine system 100 is changed from the same polarity to the opposite polarity using the lock mechanism 20 and the lock drive mechanism 24 will be described.

[0040] When the rotating electrical machine system 100 is in the same polarity state, as shown in Figure 4(a), the ball 32a is pushed radially outward by the outer peripheral surface of the rotation lock shaft 36 and is fitted into a hub groove 34a provided in a hub 34 engaged with the inner periphery of the second rotor 18. On the other hand, the ball 32b is fitted into a recess in the groove 36a provided in the rotation lock shaft 36 and does not protrude radially outward. In this same polarity locked state, the ball 32a and the hub groove 34a are fitted together, and the torque of the second rotor 18 is transmitted to the rotating shaft 14 via the ball 32a and the hub 34.

[0041] Next, the second rotor 18 is rotated to change from the same polarity to the opposite polarity. As shown in FIG. 4(b), when the rotation lock shaft 36 is moved by an external force (from left to right in the figure), the balls 32a are able to move radially along the slope of the groove 36a provided on the outer periphery of the rotation lock shaft 36. In this state, torque (rotation torque) for rotating the second rotor 18 is applied by controlling the current flowing through the stator coil of the stator 12. As a result, the balls 32a are pushed by the hub 34, disengage from the hub groove 34a, and the lock is released, and the rotation of the second rotor 18 begins.

[0042] As the rotation continues, the second rotor 18 rotates to the opposite polarity position, and another hub groove 34a provided in the hub 34 moves to the position of the ball 32b. Furthermore, the ball 32b is pushed outward in the radial direction along the slope of the groove 36a of the rotation lock shaft 36, which continues to be pressed, and the ball 32b becomes fitted into the hub groove 34a of the hub 34. In this opposite polarity locked state, the ball 32b and the hub groove 34a are fitted together, and the torque of the second rotor 18 is transmitted to the rotating shaft 14 via the ball 32b and the hub 34.

[0043] When the lock mechanism 20 and the lock drive mechanism 24 are used to transition from the reverse polarity state to the same polarity state, the reverse operation is carried out.

[0044] Furthermore, in this embodiment, the balls 32 (32a, 32b) are used, but the balls 32 may be changed to members of other shapes, such as pins.

[0045] As described above, in the rotating electric machine system 100 of this embodiment, the same polarity or opposite polarity locked state can be released by moving the rotation lock shaft 36 in the axial direction, and the second rotor 18 can be rotated relative to the rotating shaft 14 by energizing the stator 12, thereby transitioning between the same polarity state and the opposite polarity state via the rotation state. Note that the locking function between the rotating shaft 14 and the second rotor 18 can be performed passively by continuing to press the rotation lock shaft 36 while rotating the second rotor 18, without requiring any external mechanisms or additional sensors other than the lock mechanism 20 and the lock drive mechanism 24.

[0046] [Second embodiment] 5 to 7, the lock mechanism 20 and the lock drive mechanism 24 according to the second embodiment will be described. The lock mechanism 20 includes a pin 40, a transmission member 42, and a hub 44. The lock drive mechanism 24 includes a rotating lock shaft 46.

[0047] The rotating shaft 14 has a hollow region 14a extending in the axial direction. The turning lock shaft 46 has a cylindrical shape with a groove 46a on its outer surface. The turning lock shaft 46 is disposed in a region of the hollow region 14a of the rotating shaft 14 that corresponds to the inner circumferential region of the second rotor 18. The turning lock shaft 46 is provided so as to be movable in the axial direction of the rotating shaft 14 (the direction of the arrow in FIG. 5) by an external driving force from an actuator or the like.

[0048] Furthermore, the rotary shaft 14 is provided with radial through-holes in a region where the rotation lock shaft 46 can move, i.e., at a position corresponding to the inner peripheral region of the second rotor 18. The through-holes are provided in at least two locations along the circumferential direction, offset by a distance appropriate for moving a transmission member 42 (described later) like a seesaw. In this embodiment, as shown in FIG. 6, six through-holes are provided along the circumferential direction of the rotary shaft 14. Furthermore, adjacent through-holes along the circumferential direction are provided at positions that are offset alternately along the axial direction of the rotary shaft 14.

[0049] The pins 40 (40a, 40b) are filled in the through holes. The pins 40 are movable in the radial direction within the through holes. The pins 40 arranged in one of the through holes whose axial positions are offset from each other are indicated as pin 40a, and the pin 40 arranged in the other is indicated as pin 40b.

[0050] The transmission member 42 is a plate-shaped member provided to lock the rotary shaft 14 and the second rotor 18 and to transmit power between the rotary shaft 14 and the second rotor 18. The transmission member 42 is disposed in a recess provided on the outer circumferential surface of the rotary shaft 14 between the rotary shaft 14 and the hub 44. The transmission member 42 has a rotary shaft provided in its center, and both ends are pushed radially outward by pins 40a and 40b, respectively, so that the transmission member 42 can move like a seesaw around the rotary shaft in the space between the rotary shaft 14 and the hub 44. In addition, both ends of the transmission member 42 are provided with pawls that fit into hub grooves 44a provided on the inner circumferential surface of the hub 44.

[0051] The hub 44 is a cylindrical member. The hub 44 is disposed between the rotary shaft 14 and the core of the second rotor 18. The outer periphery of the hub 44 is configured to engage with the inner periphery of the second rotor 18, and the hub 44 rotates integrally with the second rotor 18.

[0052] Hub grooves 44a are formed on the inner periphery of the hub 44, into which the claws provided on both ends of the transmission member 42 can fit. The hub grooves 44a are provided at positions into which the claws on one end of the transmission member 42 fit when the second rotor 18 has the same polarity as the first rotors 16a and 16b, and at positions into which the claws on the other end of the transmission member 42 fit when the second rotor 18 has the opposite polarity as the first rotors 16a and 16b.

[0053] Furthermore, a hub groove 44b that further restricts the rotation range is provided on the inner periphery of the hub 44. A protrusion (key portion) 14c provided on the outer periphery of the rotating shaft 14 fits into the hub groove 44b, and the rotation range of the second rotor 18 relative to the rotating shaft 14 is restricted within the range in which the protrusion 14c can move within the hub groove 44b.

[0054] The following describes the operation of the lock mechanism 20 and the lock drive mechanism 24 in this embodiment. Here, the operation when the lock mechanism 20 and the lock drive mechanism 24 are used to change the rotating electrical machine system 100 from the same polarity to the opposite polarity will be described.

[0055] As shown in FIGS. 6(a) and 7(a), when the rotating electric machine system 100 has the same polarity, as in the first embodiment, the outer peripheral surface of the rotation lock shaft 46 pushes the pin 40a radially outward, pressing one end of the transmission member 42 toward the hub 44. This causes the claw on that end of the transmission member 42 to fit into the hub groove 44a of the hub 44. Meanwhile, the pin 40b fits into a recess in the groove 46a provided in the rotation lock shaft 36 and does not protrude radially outward. In addition, the protrusion 14c provided on the rotating shaft 14 abuts against one end of the hub groove 44b of the hub 44.

[0056] When the rotating electric machine system 100 is operating as a motor in a powered state, the first rotor 16 and the second rotor 18 rotate in a forward direction (counterclockwise direction in FIG. 6A) and output torque in the forward direction. During powered operation in the homopolar locked state, the powered torque of the second rotor 18 is transmitted to the rotating shaft 14 by the protrusion 14c of the rotating shaft 14 abutting against one end of the hub groove 44b of the hub 44. That is, in the powered operation state, no powered torque is applied to the pawls of the transmission member 42. On the other hand, when the rotating electric machine system 100 is operating as a generator in a regenerative operation state, the first rotor 16 and the second rotor 18 rotate in a forward direction and output regenerative torque in a reverse direction (opposite to the CCW direction in FIG. 6A). In such a regenerative operation state, the regenerative torque of the second rotor 18 is transmitted to the rotating shaft 14 by the pawls of the transmission member 42 fitted in the hub groove 44a formed in the hub 44.

[0057] Next, the second rotor 18 is rotated to change from homopolarity to opposite polarity. When the rotation lock shaft 46 is moved axially by an external force, the pin 40a is allowed to move radially along the slope of the groove 46a on the outer periphery of the rotation lock shaft 46. The pin 40b is pushed radially outward along the slope on the opposite side of the groove 46a on the outer periphery of the rotation lock shaft 46. The pin 40b pushes one end of the transmission member 42 radially outward, and the other end of the transmission member 42 pushes the now-free pin 40a radially inward. As a result, as shown in FIG. 6(b), the transmission member 42 becomes parallel (the pins 40a and 40b are at approximately the same radial position), and the claws on both sides of the transmission member 42 disengage from the hub grooves 44a on the hub 44, unlocking the second rotor 18 and the rotating shaft 14. Therefore, an increase in the rotation torque required to rotate the second rotor 18 can be suppressed.

[0058] In this state, a torque (rotation torque) for rotating the second rotor 18 is applied by controlling the current flowing through the stator coil of the stator 12. This causes the second rotor 18 to start rotating, as shown in Figures 6(b) and 7(b).

[0059] In the rotating state, when the transmission member 42 is parallel, the centrifugal forces acting on the pins 40a and 40b are the same, and the force acting on the claws of the transmission member 42, which performs the locking function, is the difference between the centrifugal forces, so the centrifugal forces of the pins 40a and 40b do not act.

[0060] Furthermore, if the rotating electric machine system 100 is transitioned from the homopolar lock state to the rotation state while operating as a motor, the torque of the second rotor 18 is transmitted to the rotating shaft 14 by the protrusion 14c of the rotating shaft 14, and the transition to the rotation state can be achieved in a state in which torque is not transmitted by the claws of the transmission member 42. In other words, when unlocking, the claws of the transmission member 42 are not pressed from both sides of the rotating shaft 14 and the hub 44, and the force required for unlocking is not increased. If pressed from both sides, friction occurs at the contact surfaces, increasing the force required for unlocking. Therefore, the increase in the external force required for axial movement of the rotation lock shaft 46 can be suppressed.

[0061] As the rotation continues, as shown in Figures 6(c) and 7(c), the second rotor 18 is rotated to the opposite polarity position, and another hub groove 44a provided in the hub 44 moves to the position of the pin 40b. Also, the pin 40b is pushed outward in the radial direction along the slope of the groove 46a of the rotation lock shaft 46 that continues to be pressed, pressing one end of the transmission member 42 toward the hub 44. As a result, the claw at that end of the transmission member 42 fits into the hub groove 44a of the hub 44. Also, the protrusion 14c provided on the rotating shaft 14 comes into contact with one end of the hub groove 44b of the hub 44 opposite to that in the same polarity locked state.

[0062] When the rotating electric machine system 100 is operating as a motor in a powered state, the first rotor 16 and the second rotor 18 rotate in the forward direction (counterclockwise direction in FIG. 6(c)) and output torque in the forward direction. During powered operation in the reverse pole locked state, the powered torque of the second rotor 18 is transmitted to the rotating shaft 14 by the pawls of the transmission member 42 fitted into the hub groove 44a provided in the hub 44. On the other hand, when the rotating electric machine system 100 is operating as a generator in a regenerative state, the first rotor 16 and the second rotor 18 rotate in the forward direction and output regenerative torque in the reverse direction (opposite to the counterclockwise direction in FIG. 6(c)). At this time, the regenerative torque of the second rotor 18 is transmitted to the rotating shaft 14 by the protrusion 14c of the rotating shaft 14 abutting against one end of the hub groove 44b of the hub 44. In other words, during the regenerative operation state, no regenerative torque is applied to the pawls of the transmission member 42.

[0063] Note that the reverse operation can be performed to transition from the reverse polarity state to the same polarity state using the lock mechanism 20 and the lock drive mechanism 24. If the rotating electric machine system 100 transitions from the reverse polarity locked state to the rotation state while the rotating electric machine system 100 is in regenerative operation, the transition to the rotation state can be achieved while torque is transmitted by the protrusion 14c of the rotating shaft 14 and the hub groove 44b of the hub 44, and torque is not transmitted by the pawl of the transmission member 42. In other words, the pawl of the transmission member 42 is not pressed from both sides of the rotating shaft 14 and the hub 44, and the force required to unlock the lock is not increased. If the pawl is pressed from both sides, friction occurs at the contact surfaces, increasing the force required to unlock the lock. Therefore, the increase in the external force required to move the rotation lock shaft 46 along the axial direction can be suppressed.

[0064] As described above, in the rotating electric machine system 100 according to the second embodiment, the same polarity or opposite polarity locked state can be released by moving the rotation lock shaft 46 in the axial direction, and the same polarity state and the opposite polarity state can be alternated by rotating the second rotor 18 relative to the rotating shaft 14 by applying current to the stator 12. The locking function between the rotating shaft 14 and the second rotor 18 can be performed passively by continuing to press the rotation lock shaft 46, without requiring any external mechanisms or additional sensors other than the lock mechanism 20 and the lock drive mechanism 24.

[0065] Furthermore, even when the rotating shaft 14, the first rotor 16, and the second rotor 18 are rotating at high speed, the centrifugal forces acting on the pin 40 and the transmission member 42 included in the locking mechanism 20 are balanced, thereby suppressing the external force required for unlocking. Furthermore, mechanical damage to the pin 40 and the transmission member 42 can be suppressed.

[0066] [Third embodiment] 8 to 11, a lock mechanism 20 and a lock drive mechanism 24 according to the third embodiment will be described. The lock mechanism 20 includes a pin 50, a transmission plate 52, and a hub 54. The lock drive mechanism 24 includes a rotating lock shaft 56.

[0067] The rotating shaft 14 has a hollow region 14a extending in the axial direction. The rotation lock shaft 56 has a cylindrical shape with a pin hole 56a into which a pin 50 included in the locking mechanism 20 is inserted. The rotation lock shaft 56 is disposed in a region of the hollow region 14a of the rotating shaft 14 that corresponds to the inner circumferential region of the second rotor 18. The rotation lock shaft 56 is provided so as to be movable in the axial direction of the rotating shaft 14 (the direction of the arrow in FIG. 8) by an external driving force from an actuator or the like.

[0068] The pin 50 is inserted into a pin hole 56a provided in the rotation lock shaft 56. When the rotation lock shaft 56 is moved in the axial direction of the rotation shaft 14, the pin 50 also moves in the axial direction together with the rotation lock shaft 56.

[0069] The transmission plate 52 is a member provided to lock the rotating shaft 14 and the second rotor 18 and to transmit power between the rotating shaft 14 and the second rotor 18. As shown in FIG. 11 , the transmission plate 52 is a plate-shaped member. The transmission plate 52 is disposed in a through hole 56b that is provided radially through the central axis of the rotation lock shaft 56. The transmission plate 52 is movable radially of the rotating shaft 14 (rotation lock shaft 56) within the through hole 56b.

[0070] 11, the transmission plate 52 is provided with a guide hole 52a for passing the pin 50. The guide hole 52a is provided along a direction oblique to both the axial and radial directions of the rotation shaft 14 when the transmission plate 52 is placed in the through hole 56b of the rotation lock shaft 56. In other words, when the pin 50, which moves together with the rotation lock shaft 56, moves axially together with the rotation lock shaft 56 in a state where the pin 50 is passed through the guide hole 52a, the transmission plate 52 is guided in the direction of the arrow indicated as the movement direction in FIG.

[0071] The hub 54 is a cylindrical member. The hub 54 is disposed between the rotary shaft 14 and the core of the second rotor 18. The outer periphery of the hub 54 is configured to engage with the inner periphery of the second rotor 18, and the hub 54 rotates integrally with the second rotor 18.

[0072] Hub grooves 54a are formed on the inner periphery of the hub 54, into which both ends of the transmission plate 52 can fit. The hub grooves 54a are provided at positions into which the claws at one end of the transmission plate 52 fit when the second rotor 18 has the same polarity as the first rotors 16a and 16b, and at positions into which the claws at the other end of the transmission plate 52 fit when the second rotor 18 has the opposite polarity as the first rotors 16a and 16b.

[0073] Furthermore, a hub groove 54b that further restricts the rotation range is provided on the inner periphery of the hub 54. A protrusion (key portion) 14c provided on the outer periphery of the rotating shaft 14 fits into the hub groove 54b, and the rotation range of the second rotor 18 relative to the rotating shaft 14 is restricted within the range in which the protrusion 14c can move within the hub groove 54b.

[0074] The following describes the operation of the lock mechanism 20 and the lock drive mechanism 24 in this embodiment. Here, the operation when the lock mechanism 20 and the lock drive mechanism 24 are used to change the rotating electrical machine system 100 from the same polarity to the opposite polarity will be described.

[0075] As shown in FIGS. 9(a) and 10(a), when the rotating electric machine system 100 has the same polarity, an external force is applied to the rotation lock shaft 56 so that the pin 50 is positioned at one end of the guide hole 52a (the lower end in FIG. 10(a)). The pin 50 passed through the guide hole 52a pushes the transmission plate 52 up (upward in FIGS. 9(a) and 10(a)), pressing one end of the transmission plate 52 toward the hub 54. This causes the one end of the transmission plate 52 to fit into the hub groove 54a of the hub 54. In addition, the protrusion 14c provided on the rotating shaft 14 is in contact with one end of the hub groove 54b of the hub 54.

[0076] When the rotating electric machine system 100 is operating as a motor in a powered state, the first rotor 16 and the second rotor 18 rotate in the forward direction (the counterclockwise direction in FIG. 9A) and output torque in the forward direction. During powered operation in the homopolar locked state, the powered torque of the second rotor 18 is transmitted to the rotating shaft 14 by the protrusion 14c of the rotating shaft 14 abutting against one end of the hub groove 54b of the hub 54. That is, in the powered state, no powered torque is applied to the end of the transmission plate 52. On the other hand, when the rotating electric machine system 100 is operating as a generator in a regenerative state, the first rotor 16 and the second rotor 18 rotate in the forward direction and output regenerative torque in the reverse direction (the direction opposite to the counterclockwise direction in FIG. 9A). In such a regenerative state, the regenerative torque of the second rotor 18 is transmitted to the rotating shaft 14 by the end of the transmission plate 52 fitted in the hub groove 54a provided in the hub 54.

[0077] Next, the second rotor 18 is rotated to change from the same polarity to the opposite polarity. When the rotation lock shaft 56 is moved by an external force (in the direction of the arrow in FIG. 10(a)), the pin 50 moves along with the rotation lock shaft 56, and the transmission plate 52 is pushed down along the slope of the guide hole 52a (downward in FIGS. 9(b) and 10(b)). As a result, the end of the transmission plate 52 disengages from the hub groove 54a, and the second rotor 18 and the rotating shaft 14 are unlocked. Therefore, an increase in the rotation torque required to rotate the second rotor 18 can be suppressed.

[0078] In this state, a torque (rotation torque) for rotating the second rotor 18 is applied by controlling the current flowing through the stator coil of the stator 12. This causes the second rotor 18 to start rotating, as shown in Fig. 9(b) and Fig. 9(b).

[0079] Furthermore, if the rotating electric machine system 100 is transitioned from the homopolar lock state to the rotation state while operating as a motor, the torque of the second rotor 18 is transmitted to the rotating shaft 14 by the protrusion 14c of the rotating shaft 14, and the transition to the rotation state can be achieved in a state in which torque is not transmitted by the end of the transmission plate 52. In other words, when unlocking, the transmission plate 52 is not pressed by the hub groove 54a of the hub 54, and the force required for unlocking does not increase. If pressed, friction occurs at the contact surface, increasing the force required for unlocking. Therefore, an increase in the external force required for axial movement of the rotation lock shaft 56 can be suppressed.

[0080] As the rotation continues, as shown in Figures 9(c) and 10(c), the second rotor 18 is rotated to the opposite polarity position, and another hub groove 54a provided in the hub 54 moves to the position of the transmission plate 52. Also, the pin 50 moves together with the rotation lock shaft 56, which continues to be pressed, and the pin 50 is positioned at one end of the guide hole 52a (the upper end in Figure 10(c)). As a result, the end of the transmission plate 52 is fitted into the hub groove 54a of the hub 54. Also, the protrusion 14c provided on the rotating shaft 14 is in contact with one end of the hub groove 54b of the hub 54 opposite to that in the same polarity locked state.

[0081] When the rotating electric machine system 100 is operating as a motor in a powered state, the first rotor 16 and the second rotor 18 rotate in the forward direction (counterclockwise direction in FIG. 9(c)) and output torque in the forward direction. During powered operation in the reverse pole locked state, the powered torque of the second rotor 18 is transmitted to the rotating shaft 14 by the end of the transmission plate 52 fitted in the hub groove 54a provided in the hub 54. On the other hand, when the rotating electric machine system 100 is operating as a generator in a regenerative state, the first rotor 16 and the second rotor 18 rotate in the forward direction and output regenerative torque in the reverse direction (the direction opposite to the counterclockwise direction in FIG. 9(c)). At this time, the regenerative torque of the second rotor 18 is transmitted to the rotating shaft 14 by the protrusion 14c of the rotating shaft 14 abutting against one end of the hub groove 54b of the hub 54. In other words, during regenerative operation, no regenerative torque is applied to the end of the transmission plate 52.

[0082] Note that the reverse operation can be performed to transition from the reverse polarity state to the same polarity state using the lock mechanism 20 and the lock drive mechanism 24. If the rotating electric machine system 100 transitions from the reverse polarity locked state to the rotation state while the rotating electric machine system 100 is in regenerative operation, the transition to the rotation state can be achieved while torque is transmitted by the protrusion 14c of the rotating shaft 14 and the hub groove 54b of the hub 54, and torque is not transmitted by the end of the transmission plate 52. In other words, the transmission plate 52 is not pressed by the hub groove 54a of the hub 54, and the force required to unlock the plate 52 is not increased. If the plate 52 were pressed, friction would occur at the contact surface, increasing the force required to unlock the plate 52. Therefore, the increase in the external force required to move the rotation lock shaft 56 along the axial direction can be suppressed.

[0083] As described above, in the rotating electric machine system 100 of the third embodiment, the same polarity or opposite polarity locked state can be released by moving the rotation lock shaft 56 in the axial direction, and the same polarity state and the opposite polarity state can be alternated by rotating the second rotor 18 relative to the rotating shaft 14 by applying current to the stator 12. Note that the locking function between the rotating shaft 14 and the second rotor 18 can be performed passively by continuing to press the rotation lock shaft 56, without requiring any external mechanisms or additional sensors other than the lock mechanism 20 and the lock drive mechanism 24.

[0084] Also, the locked state and unlocked state can be achieved with a simple configuration using the transmission plate 52. Furthermore, since the transmission plate 52 is located at the center of the second rotor 18 during rotation, the structure is less susceptible to the effects of centrifugal force caused by rotation.

[0085] In any of the rotating electrical machine systems 100 in the first to third embodiments, the locking mechanism 20 and the lock driving mechanism 24 are disposed inside the second rotor 18, and the rotational movement is performed by energizing the stator 12, so that the same polarity state and the opposite polarity state can be achieved without increasing the volume of the rotating electrical machine system 100. Also, there is no need for means for detecting or controlling the skew angle for locking.

[0086] 12, a configuration may be adopted in which an elastic body 60 such as a spring is provided in the hollow portion of the rotating shaft 14 to continuously apply a force to the rotation lock shaft 56 from one side along the axial direction. By providing the elastic body 60 such as a spring, it becomes possible to continuously apply an external force to the rotation lock shaft 56 from one side. This makes it possible to maintain the same-polarity locked state or the opposite-polarity locked state even when an actuator or the like that externally drives the rotation lock shaft 56 of the rotating electric machine system 100 is stopped. A similar configuration can be applied to the rotating electric machine systems 100 in the first and second embodiments.

[0087] It is also possible to operate the rotation lock shaft 56 by using, for example, the hydraulic pressure of the lubricating oil used for bearings, gears, etc., without providing a special actuator for the mechanism that applies an external force to the rotation lock shaft 56. In this case, the existing lubricating oil pump can be used, so there is no need to add a mechanism such as an actuator that applies a driving force from the outside, and the overall system can be made smaller.

[0088] [Control of rotating electrical systems] However, when the field magnetic flux of the first rotor 16 and the second rotor 18 is increased to increase the torque of the rotating electrical machine system 100, the induced voltage (back electromotive voltage) generated by the magnets (field) increases. As a result, for example, when the rotating electrical machine system 100 is driven by an inverter, if the induced voltage exceeds the withstand voltage of the switching elements, the switching elements may be damaged. Therefore, it is necessary to simultaneously increase the torque in the rotating electrical machine system 100 and suppress the back electromotive voltage to an upper limit or less.

[0089] In the following description, the rotational speed refers to the number of rotations per unit time (rotational speed) of the first rotor 16 or the second rotor 18. For example, the unit of rotational speed per minute is rpm.

[0090] For example, if the axial ratio of the first rotors 16a and 16b to the second rotor 18 is 4:1, and one-quarter of the magnetic poles are changed from the same polarity to the opposite polarity by rotating the second rotor 18 at half the upper limit rotation speed, the magnetic flux from the north and south poles cancels out in half of the axial direction. As a result, the field magnetic flux is halved, and the back electromotive force is also halved, enabling control without damaging the switching elements even at high rotation speeds. Figures 13(a) and 13(b) show the changes in the back electromotive force ratio and torque ratio with the rotation speed of the first rotor 16 and the second rotor 18 in this case. Within the drivable range of the rotating electric machine system 100, torque at low speeds can be increased compared to a comparative motor.

[0091] The rotation control of the second rotor 18 suitable for the rotating electrical machine system 100 is as follows: Up to the rotation speed N1, the first rotor 16 and the second rotor 18 are driven with the same polarity and accelerated by power torque.

[0092] When the rotation speed reaches rotation speed N1, the mode switches to rotation control mode 1, which rotates second rotor 18 from the same polarity to the opposite polarity. In rotation control mode 1, the torque (output torque) output to rotating shaft 14 is maintained while a rotation torque for rotating second rotor 18 relative to first rotor 16 is simultaneously output, thereby performing a rotation operation. Specifically, in the same polarity state, output torque is output by both first rotor 16 and second rotor 18, and during the rotation operation in rotation control mode 1, the current passed through the stator coil of stator 12 is controlled so that rotation torque is output by second rotor 18 while maintaining output torque by first rotor 16.

[0093] In this way, when the rotation speed reaches or exceeds N1, the rotating electrical machine system 100 is driven with the second rotor 18 having the opposite polarity to the first rotor 16.

[0094] If the vehicle is braked or otherwise applied while driving with the reverse polarity, deceleration occurs due to regenerative torque. When the rotation speed reaches N2 due to deceleration, the system transitions to rotation control mode 2, which rotates the second rotor 18 from the reverse polarity to the same polarity. In rotation control mode 2, as in rotation control mode 1, output torque is maintained while rotation torque is simultaneously output to perform rotation operation. Specifically, when the polarity is reversed, output torque is output by both the first rotor 16 and the second rotor 18, and during rotation operation in rotation control mode 2, the current passed through the stator coil of the stator 12 is controlled so that rotation torque is output by the second rotor 18 while output torque by the first rotor 16 is maintained.

[0095] In this way, when the rotation speed becomes equal to or lower than N2, the rotating electrical machine system 100 is driven with the second rotor 18 having the same polarity as the first rotor 16.

[0096] If the rotation speeds N1 and N2 are the same, chattering may occur, in which the rotational movement from the same polarity to the opposite polarity or from the opposite polarity to the same polarity is repeated around those rotation speeds. Therefore, it is preferable to set the rotation speed N1 greater than the rotation speed N2. In this way, by providing hysteresis between the rotation speed N1, which is the reference for starting the rotational movement from the same polarity to the opposite polarity, and the rotation speed N2, which starts the rotational movement from the opposite polarity to the same polarity, the chattering phenomenon can be suppressed.

[0097] Furthermore, compared to a rotational operation from the same polarity to the same polarity, the rotational torque that can be output while maintaining the output torque is smaller when rotating from the opposite polarity to the same polarity, and the conditions under which the rotational operation is possible are limited. Therefore, it is preferable to add a torque constraint in addition to the rotation speed constraint (rotation speed N2) as a condition for transitioning from the opposite polarity to the same polarity rotation control mode 2. That is, it is preferable to transition to the rotation control mode 2 under the condition that the rotation speeds of the first rotor 16 and the second rotor 18 are equal to or less than the rotation speed N2 and the output torque is equal to or less than the reference torque T2.

[0098] In particular, when the rotating electric machine system 100 is in a regenerative operation in the reverse polarity state and the rotation speeds of the first rotor 16 and the second rotor 18 are decreasing from rotation speed N1, the rotation control mode is not switched to rotation control mode 2, and the rotating electric machine system 100 is driven in the reverse polarity state during the regenerative operation. Thereafter, when the rotating electric machine system 100 is re-accelerated and transitions to a powering state or when the rotating electric machine system 100 stops, the output torque becomes zero or crosses zero and transitions from negative regenerative torque to positive powering torque. Therefore, it is preferable to switch to rotation control mode 2 and perform a rotation operation when the output torque is at or near zero. Note that the closer the output torque is to zero, the greater the rotation torque that can be output, making it easier to rotate the second rotor 18 from the opposite polarity to the same polarity relative to the first rotor 16.

[0099] Figure 14 shows an example of the time variations in the rotation speed, phase difference angle, output torque, torque of the first rotor 16 (main rotor torque), and torque of the second rotor 18 (rotating rotor torque) during rotation operation in rotation control mode 1, which transitions from the same polarity to the opposite polarity. The torques (output torque, main rotor torque, rotating rotor torque) are values ​​calculated by magnetic field analysis. These characteristics show the results when the maximum current is set below the upper limit.

[0100] These results indicate that rotational motion can be achieved while maintaining the output torque at a predetermined value. Furthermore, by releasing the same-polarity lock state and switching the control of the current flowing through the stator coil of the stator 12 to rotation control mode 1, and changing the current control conditions according to the phase difference angle, the second rotor 18 can be rotated by the torque (rotational torque) of the second rotor 18 while maintaining the output torque with the torque (main rotor torque) of the first rotor 16. Furthermore, after the rotational motion is completed, the opposite-polarity lock state is established, and the control of the current flowing through the stator coil of the stator 12 is also changed.

[0101] 15 and 16 show examples of changes in rotation torque from homopolar to opposite polarity and from opposite polarity to homopolar with respect to rotation speed while maintaining the output torque at a predetermined value, and the conditions (regions) under which rotation is possible. In FIGS. 15 and 16, conditions marked with an "x" indicate conditions suitable for switching to rotation. Symbol (1) indicates a condition suitable for transitioning to rotation control mode 1, and symbols (2) and (3) indicate conditions suitable for transitioning to rotation control mode 2. Symbol (2) indicates a condition under which the rotation speed falls below rotation speed N2, and symbol (3) indicates a condition under which the torque approaches 0 in addition to the condition under which the rotation speed falls below rotation speed N2.

[0102] 17 and 18 illustrate a method for suppressing torque shocks associated with the rotation of the second rotor 18. As shown in FIG. 17 , when the rotation speed of the rotating electric machine system 100 is increased while the output torque is at its maximum, a torque gap may occur during the transition from the homopolar state to the reverse polarity state at a predetermined rotation speed, potentially resulting in a torque shock in the rotating electric machine system 100. Therefore, as shown in FIG. 18 , it is preferable to perform control to limit the driving range so as to reduce the output torque of the rotating electric machine system 100 before transitioning from the homopolar state to the reverse polarity state at the predetermined rotation speed. For example, the current to the stator coil of the stator 12 is controlled so that the output torque becomes the maximum torque in the reverse polarity state, and then control is performed to transition from the homopolar state to the reverse polarity state. This prevents a torque gap from occurring during the transition from the homopolar state to the reverse polarity state, thereby suppressing torque shock in the rotating electric machine system 100.

[0103] As described above, in the rotating electric machine system 100, torque is transmitted by the protrusion 14c provided on the rotating shaft 14 when the rotating electric machine system 100 is in the same polarity state and powering state. When torque is transmitted by the protrusion 14c in this manner, torque is not applied to the locking mechanism 20, and therefore the lock can be released by moving the lock drive mechanism 24 with an external force. At this time, the output torque of the first rotor 16 and the second rotor 18 is transmitted by the protrusion 14c, so there is no reduction in output torque due to the unlocking. On the other hand, in the regenerative state in which the output torque is in the opposite direction, torque is transmitted by the locking mechanism 20. When torque is transmitted by the locking mechanism 20 in this manner, torque is applied to the locking mechanism 20, and therefore the lock cannot be released by simply moving the lock drive mechanism 24 with an external force. Therefore, when transitioning from the same polarity state to the opposite polarity state, this is performed when the rotating electric machine system 100 is in the powering state.

[0104] 19 shows a flowchart of control for transitioning from the same polarity state to the opposite polarity state. Hereinafter, the control for transitioning the rotating electrical machine system 100 from the same polarity state to the opposite polarity state will be described with reference to this flowchart.

[0105] In step S10, normal drive control is performed in the homopolar state. In step S12, it is determined whether the rotation speed is equal to or greater than rotation speed N1. If the rotation speed is equal to or greater than rotation speed N1, the process proceeds to step S14. If the rotation speed is less than rotation speed N1, the process returns to step S12. In step S14, the lock drive mechanism 24 is driven. In step S16, it is determined whether the lock has been released. If the lock has been released, the process proceeds to step S18. If the lock has not been released, the process returns to step S14, and the drive of the lock drive mechanism 24 continues. The release of the lock can be detected using a sensor. For example, the position of the rotating lock shaft can be detected by a sensor, and whether the state is locked or unlocked can be determined based on the position of the rotating lock shaft.

[0106] In step S18, the second rotor 18 is rotated relative to the first rotor 16. At this time, the lock drive mechanism 24 continues to be driven. In step S20, it is determined whether or not locking has been completed. By continuing to drive the lock drive mechanism 24 while rotating the second rotor 18, the rotating electric machine system 100 enters a locked state in the reverse polarity state. If locking has been completed, the process proceeds to step S22; if locking has not been completed, the process is repeated from step S18. In step S22, normal drive control is started in the reverse polarity state.

[0107] The transition from the reverse polarity state to the same polarity state can be controlled in the same manner as in the above flow. In this case, normal control in the reverse polarity state is performed in step S10, and normal control in the same polarity state is performed in step S22. Furthermore, the determination in step S12 may be made on the condition that the rotation speed is equal to or less than rotation speed N2. Furthermore, a condition that the torque is close to 0 may be added to the above conditions. [Explanation of symbols]

[0108] 10 housing, 12 stator, 14 rotating shaft, 14a hollow area, 14b through hole, 14c protrusion (key portion), 20 lock mechanism, 22 bearing, 24 lock drive mechanism, 30 magnet, 32 (32a, 32b) ball, 34 hub, 34a hub groove, 36 rotating lock shaft, 36a groove, 40 pin, 40 (40a, 40b) pin, 42 transmission member, 44 hub, 44a hub groove, 44b hub groove, 46 rotating lock shaft, 46a groove, 50 pin, 52 transmission plate, 52a guide hole, 54 hub, 54a hub groove, 54b hub groove, 56 rotating lock shaft, 56a pin hole, 56b through hole, 60 elastic body, 100 rotating electric machine system, 102 rotating electric machine, 104 Drive circuit, 106 power supply, 108 control device.

Claims

1. A rotating electric machine including a stator and a rotor disposed opposite the stator, The rotor includes a first rotor fixed to a rotation shaft, and a second rotor separated from the first rotor along the axial direction of the rotation shaft and rotatable relative to the first rotor around the rotation shaft. a rotation lock shaft that is drivable in the axial direction within a hollow region provided in the rotation shaft; a lock mechanism that switches between a locked state in which the rotary shaft and the second rotor rotate integrally and a rotation state in which the second rotor rotates relatively to the rotary shaft by driving the rotation lock shaft; Equipped with The locking mechanism is a transmission member that can be driven in a radial direction of the rotation shaft in accordance with the movement of the rotation lock shaft; a groove portion that rotates together with the second rotor and into which the transmission member is fitted, thereby locking the second rotor and the rotary shaft; A rotating electric machine comprising:

2. 2. The rotating electric machine according to claim 1, A rotating electric machine characterized in that the transmission member is a plurality of balls or pins.

3. A rotating electric machine comprising a stator and a rotor disposed opposite the stator, The rotor includes a first rotor fixed to a rotation shaft, and a second rotor separated from the first rotor along the axial direction of the rotation shaft and rotatable relative to the first rotor around the rotation shaft. a rotation lock shaft that is drivable in the axial direction within a hollow region provided in the rotation shaft; a lock mechanism that switches between a locked state in which the rotary shaft and the second rotor rotate integrally and a rotation state in which the second rotor rotates relatively to the rotary shaft by driving the rotation lock shaft; Equipped with The locking mechanism is a transmission member disposed between the rotary shaft and the second rotor, the transmission member having both ends that can be driven exclusively in the radial direction of the rotary shaft in accordance with the movement of the rotation lock shaft; a groove portion that rotates together with the second rotor and into which an end portion of the transmission member is fitted to lock the second rotor and the rotary shaft; A rotating electric machine comprising:

4. 4. The rotating electric machine according to claim 3, The rotating electric machine is characterized in that the transmission member is a plate-like member that can move like a seesaw relative to the rotation shaft.

5. A rotating electric machine comprising a stator and a rotor disposed opposite the stator, The rotor includes a first rotor fixed to a rotation shaft, and a second rotor separated from the first rotor along the axial direction of the rotation shaft and rotatable relative to the first rotor around the rotation shaft. a rotation lock shaft that is drivable in the axial direction within a hollow region provided in the rotation shaft; a lock mechanism that switches between a locked state in which the rotary shaft and the second rotor rotate integrally and a rotation state in which the second rotor rotates relatively to the rotary shaft by driving the rotation lock shaft; Equipped with The locking mechanism is a transmission member disposed within the rotation shaft and drivable along a radial direction of the rotation shaft in accordance with movement of the rotation lock shaft; a groove portion that rotates together with the second rotor and into which an end portion of the transmission member is fitted to lock the second rotor and the rotary shaft; A rotating electric machine comprising:

6. 6. The rotating electric machine according to claim 5, The rotating electric machine is characterized in that the transmission member is a transmission plate disposed in a through hole that is provided radially through the central axis of the rotation lock shaft.

7. A rotating electric machine according to any one of claims 1 to 6, a rotating electric machine including an elastic body that biases the rotation lock shaft in the axial direction;

8. A rotating electric machine according to any one of claims 1 to 7, The rotary electric machine is characterized in that the rotation lock shaft is driven by hydraulic pressure.

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