JP2023141777A - Rotary electric machine - Google Patents

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 can switch the state between a locked state in which a rotating shaft 14 and a second rotor 18 rotate together, and a rotating state in which the second rotor 18 rotates relative to the rotating shaft 14, and controls to rotate the second rotor 18 relative to a first rotor 16 to control the transition from the same polarity state to the opposite polarity state while maintaining the output torque on the condition that the number of rotations of the first rotor 18 is equal to or higher than the number of rotations N1.SELECTED DRAWING: Figure 3

Description

The present invention relates to a rotating electric machine.

Motors for driving moving objects such as automobiles are required to be small and highly efficient, as well as have a wide operating range. In order to reduce the size by increasing the torque at low speeds, efforts are being made to increase the magnetomotive force of the rotor, such as by using strong magnets in the rotor. However, when a rotor with a high magnetomotive force is used, magnetic flux weakening control is required during high-speed running, and there is a concern that motor efficiency may decrease due to an increase in current accompanying this control.

Therefore, motor structures in which the rotor is divided in the axial direction have been proposed in order to make the magnetomotive force of the rotor variable according to the operating conditions (Patent Documents 1 to 5). When torque is required at low speeds, the orientation of the magnetic poles in the axial direction is aligned (same polarity: N-pole to N-pole and S-pole to S-pole aligned) to increase the magnetomotive force. If you want to suppress the magnetomotive force at high speeds, change the direction of the magnetic poles in the axial direction (reverse polarity: state in which the N and S poles are aligned). Hereinafter, a state in which the magnetic poles are aligned will be referred to as "same polarity," and a state in which the magnetic poles are oriented in opposite directions will be referred to as "reverse polarity." In this type of motor structure, the rotor is split in the axial direction and rotates to switch between the same polarity and opposite polarity, and the locking mechanism is used to maintain each rotor state so that it can be driven as a motor with the same polarity and opposite polarity. functionality is required.

Japanese Patent Application Publication No. 2004-064942 Japanese Patent Application Publication No. 2011-160631 Japanese Patent Application Publication No. 2011-015523 Japanese Patent Application Publication No. 2016-131450 JP2017-225231A

In the technologies of Patent Documents 1 to 3 mentioned above, the rotation operation and the locking function are realized by the same power source (actuator or oil pump). Therefore, it is necessary to additionally provide a dedicated external actuator and a high-pressure oil pump, which increases the size of the motor system. In particular, since the force (torque) required for the rotation operation is greater than that for the locking function, additional components are required. Furthermore, if the locking mechanism is realized or assisted by a spring, the force required for the rotational movement will increase. Therefore, there is a problem in that the force (torque) required for the rotational operation further increases, and the motor system becomes larger.

Further, in the technique of Patent Document 4, the rotation operation is performed by a current flowing through the stator winding, and the locking function is performed by a small electromagnetic clutch. Further, in the technique disclosed in Patent Document 5, the rotation operation is performed by using a current applied to the stator winding, and a limiter (stopper) function is added to the lock function. In these conventional techniques, by separating the power sources for the rotation operation and the locking function, the motor system can be made smaller compared to other conventional structures. However, since a locking mechanism is additionally provided on the outside of the motor structure, there is still a problem that the entire motor system becomes large. Furthermore, in a configuration in which a lock function is realized by adding a limiter function, it is necessary to add a position detection sensor. In addition, if the responsiveness of lock control is poor, locking may not be possible.

One aspect of the present invention is a rotating electric machine including a stator and a rotor disposed opposite to the stator, the rotor including a first rotor fixed to a rotating shaft, and a first rotor fixed to the rotating shaft. a second rotor that is divided from the first rotor along the axial direction and is rotatable relative to the first rotor about the rotation axis, the rotation axis and the second rotor; It is possible to switch between a locked state in which the first rotor rotates integrally with the second rotor, and a rotating state in which the second rotor rotates relative to the rotating shaft, and the first rotor rotates at a first rotational speed. The second rotor is controlled to rotate with respect to the first rotor to transition from the same polarity state to the opposite polarity state while maintaining the output torque, on the condition that the rotation speed is equal to or higher than a reference number of rotations. This is a rotating electric machine.

Another aspect of the present invention is a rotating electric machine including a stator and a rotor disposed opposite to the stator, the rotor including a first rotor fixed to a rotating shaft, and a first rotor fixed to the rotating shaft. a second rotor that is divided from the first rotor along the axial direction and is rotatable relative to the first rotor about the rotation axis, the rotation axis and the second rotor; It is possible to switch between a locked state in which the first rotor and the second rotor rotate together, and a rotating state in which the second rotor is rotated relative to the rotation axis, and the rotation speed of the first rotor is the same as the second rotor. The second rotor is controlled to rotate with respect to the first rotor to transition from a reverse polarity state to a same polarity state while maintaining the output torque, on the condition that the rotation speed becomes equal to or less than a reference number of rotations. This is a rotating electric machine.

Here, further, on the condition that the output torque becomes equal to or less than the reference torque, the second rotor is rotated with respect to the first rotor while maintaining the output torque, from the opposite polarity state to the same polarity state. It is preferable to control the transition.

The invention also includes a sensor for detecting whether the locked state is the locked state or the locked state is released, and after the sensor detects that the locked state is the released state, the rotating shaft is moved to the rotating shaft. It is preferable that the second rotor be in a rotating state in which the second rotor is relatively rotated.

Further, after the sensor detects that the locked state changes from the unlocked state to the locked state, normal control is performed to rotate the first rotor and the second rotor together from the rotating state. It is preferable that

According to the present invention, it is possible to provide a rotating electrical machine that simultaneously realizes rotor rotation and locking functions without increasing the size of the motor system.

1 is a diagram showing the configuration of a rotating electrical machine system in an embodiment of the present invention. FIG. 2 is a cross-sectional view showing the configuration of a rotor in the first embodiment. FIG. 2 is a cross-sectional perspective view showing the configuration of a rotor in the first embodiment. FIG. 3 is a cross-sectional perspective view illustrating the function of the rotor in the first embodiment. FIG. 7 is a cross-sectional perspective view showing the configuration of a rotor in a second embodiment. FIG. 7 is a cross-sectional view illustrating the action of the rotor in the second embodiment. FIG. 7 is a cross-sectional perspective view illustrating the function of a rotor in a second embodiment. FIG. 7 is a cross-sectional perspective view showing the configuration of a rotor in a third embodiment. FIG. 7 is a cross-sectional view illustrating the action of a rotor in a third embodiment. FIG. 7 is a cross-sectional perspective view illustrating the function of a rotor in a third embodiment. It is a figure which shows the structure of the transmission plate in 3rd Embodiment. FIG. 7 is a cross-sectional perspective view showing a modification of the rotor configuration in the third embodiment. It is a figure which shows the change of the back electromotive force ratio and torque ratio with respect to the rotation speed in embodiment of this invention. It is a figure showing the time change of the characteristic during rotation operation in an embodiment of the present invention. It is a figure for explaining the switching timing from a homopolar state to a reverse polarity state in embodiment of this invention. It is a figure for explaining the timing of switching from a reverse polarity state to a same polarity state in an embodiment of the present invention. It is a figure for explaining rotation control in an embodiment of the present invention. It is a figure for explaining suitable rotation control in an embodiment of the present invention. It is a flowchart which shows the transition control from a homopolar state to a reverse polarity state in embodiment of this invention.

[First embodiment]
A rotating electrical machine system 100 according to the first embodiment of the present invention is configured to include a rotating electrical machine 102, a drive circuit 104, a power source 106, and a control device 108, as shown in FIG. The rotating electric machine system 100 is installed in, for example, a hybrid vehicle, an electric vehicle, a fuel cell vehicle, or the like. The rotating electric machine system 100 can be used as a motor that generates driving force, and can also be used as a generator, and a motor generator that functions as both a motor and a generator.

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 lock mechanism 20, a bearing 22, and a lock drive mechanism 24. Note that the second rotor 18 may be configured to slide on the rotating shaft 14 without providing the bearing 22.

The rotating electric machine 102 uses electric power supplied from a power source 106 to generate a driving force for the rotating shaft 14 by a drive circuit 104 controlled by a control device 108 . Further, the rotational energy given to the rotating shaft 14 is converted into electric power by the drive circuit 104 and regenerated to the power source 106. The drive circuit 104 can be configured to include an inverter that converts power from the power source 106 into alternating current. The power supply 106 can be configured to include, for example, a power storage system including a secondary battery.

The housing 10 is configured to mechanically support the rotating electric machine 102. A stator 12, a rotation shaft 14, a first rotor 16, a second rotor 18, a lock mechanism 20, a bearing 22, and a lock drive mechanism 24 are housed in the housing 10.

The stator 12 includes a stator core and a stator coil. The stator core is a hollow cylindrical member made of a laminated body of electromagnetic steel sheets laminated 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 magnetic materials such as amorphous metals, nanocrystalline soft magnetic materials, powder magnetic cores, and the like. The stator coil is a coil arranged in a plurality of slots provided on the inner peripheral surface of the stator core. By passing current through the stator coil from the power supply 106 via the drive circuit 104, a magnetic field can be generated in the stator coil.

A first rotor 16 and a second rotor 18 are arranged on the rotating shaft 14 at intervals along the axial direction. In the rotating electrical machine system 100 in 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-divided structure, but may have any structure as long as they are divided in the axial direction and can rotate relative to each other.

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

The first rotor 16 (16a, 16b) includes a base fixed to the rotating shaft 14, and a laminate in which electromagnetic steel plates are laminated in the axial direction on the outer peripheral side of the base. However, the material constituting the laminate is not limited to electromagnetic steel sheets, and may be magnetic materials such as amorphous metals, nanocrystalline soft magnetic materials, powder magnetic cores, and the like.

The second rotor 18 includes a laminate in which electromagnetic steel plates are laminated in the axial direction. However, the material constituting the laminate is not limited to electromagnetic steel sheets, and may be magnetic materials such as amorphous metals, nanocrystalline soft magnetic materials, powder magnetic cores, and the like.

In this embodiment, as shown in the schematic cross-sectional view of FIG. 2, magnets 30 are arranged at equal intervals along the circumferential direction of the first rotor 16 and the second rotor 18. For example, the magnet 30 has eight poles arranged so that the N pole and the S pole alternate at 45° intervals. Note that FIG. 2 typically shows the second rotor 18, and the directions of the magnetic poles of the magnets 30 are shown by arrows going from the S pole to the N pole. The arrangement of the magnets 30 is the same for the first rotor 16 as well. However, the schematic cross-sectional view of FIG. 2 shows an example of the arrangement of the magnets 30, and the arrangement of the magnets 30 is not limited to this.

Further, a locking mechanism 20 is provided so that the second rotor 18 can be fixed to the rotating shaft 14. In this embodiment, a lock mechanism 20 is provided between the second rotor 18 and the rotating shaft 14. The lock mechanism 20 is driven by a lock drive mechanism 24 provided within the rotating shaft 14.

During normal operation of the rotating electric machine system 100, the lock mechanism 20 prevents the second rotor 18 from rotating with respect to the rotating shaft 14, so that both the first rotor 16 (16a, 16b) and the second rotor 18 are The state is such that it contributes to the rotation of the rotating shaft 14. On the other hand, when adjusting the field, the lock mechanism 20 is opened to enable the second rotor 18 to rotate about the rotation axis 14, and the second rotor 18 is moved relative to the first rotor 16 (16a, 16b). By rotating the rotor and adjusting its position in the circumferential direction, the field of the rotor as a whole can be adjusted.

In such a configuration, current is applied to the stator coil of the stator 12 when the lock mechanism 20 is in a coupled state and the first rotor 16 (16a, 16b) and second rotor 18 do not rotate with respect to the rotating shaft 14 (normal operating state). By flowing a rotating magnetic field to form a rotating magnetic field, it is possible to generate an output torque that rotates the rotating shaft 14 with respect 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.

In addition, by controlling the current flowing through the stator coil of the stator 12 with the lock mechanism 20 in an open state and the second rotor 18 being rotatable with respect to the rotating shaft 14 (adjusted state), the first rotor 16 (16a , 16b) to the rotating shaft 14, the relative phase angle (skew angle) of the magnetic poles of the first rotor 16 (16a, 16b) and the second rotor 18 can be adjusted. Note that it is preferable that the current flowing through the stator coil of the stator 12 be subjected to so-called vector control.

Hereinafter, the N poles of the first rotor 16a and the first rotor 16b and the N pole of the second rotor 18 are aligned along the axial direction, and the S pole of the first rotor 16a and the first rotor 16b and the S pole of the second rotor 18 are aligned. The state where the two are along the axial direction is called homopolar. Further, the N pole of the first rotor 16a and the first rotor 16b and the S pole of the second rotor 18 are aligned along the axial direction, and the S pole of the first rotor 16a and the first rotor 16b and the N pole of the second rotor 18 are aligned. The state where is along the axial direction is called reverse polarity.

Hereinafter, the lock mechanism 20 and lock drive mechanism 24 in this embodiment will be described with reference to FIGS. 2 and 3. The locking mechanism 20 includes a ball 32 and a hub 34. Further, the lock drive mechanism 24 is configured to include a rotation lock shaft 36.

The rotating shaft 14 has a hollow region 14a extending in the axial direction. The rotation lock shaft 36 has a cylindrical shape with a groove 36a on the outer surface. The rotation lock shaft 36 is arranged in a region corresponding to the inner peripheral region of the second rotor 18 in the hollow region 14a of the rotating shaft 14. The rotation lock shaft 36 is provided so as to be movable in the axial direction of the rotating shaft 14 (in the direction of the arrow in FIG. 3) by an external driving force such as an actuator.

Further, the rotation shaft 14 is provided with a through hole 14b in the radial direction at a position corresponding to the movable region of the rotation lock shaft 36, that is, the inner peripheral region of the second rotor 18. The through holes 14b are provided in at least two positions that are shifted by a predetermined distance along the circumferential direction. In this embodiment, as shown in FIG. 2, eight through holes 14b are provided at equal intervals along the circumferential direction of the rotating shaft 14. Further, the through holes 14b that are adjacent to each other along the circumferential direction are provided at alternately shifted positions along the axial direction of the rotating shaft 14.

The balls 32 (32a, 32b) are filled into the through hole 14b as a transmission member. In this embodiment, an example is shown in which three balls 32 are provided in each through hole 14b. The ball 32 is movable in the through hole 14b along the radial direction. Note that the ball 32 placed in one of the through holes 14b whose axial positions are shifted from each other is shown as a ball 32a, and the ball 32 placed in the other side is shown as a ball 32b.

The hub 34 is a member having a cylindrical shape. Hub 34 is disposed between ball 32 and the core of second rotor 18 . The outer circumference of the hub 34 is configured to engage with the inner circumference of the second rotor 18, and the hub 34 rotates together with the second rotor 18.

The inner periphery of the hub 34 is provided with a hub groove 34a into which the ball 32 can fit, as will be described later. The hub groove 34a is located at a position where the ball 32a fits in when the second rotor 18 has the same polarity as the first rotor 16a and the first rotor 16b, and at a position where the ball 32a fits into the hub groove 34a. The ball 32b is provided at a position where the ball 32b fits in when the second rotor 18 is in the opposite polarity.

With reference to FIG. 4, the functions of the lock mechanism 20 and lock drive mechanism 24 in the rotating electric machine system 100 will be explained. Here, an explanation will be given of the operation when the rotating electric machine system 100 is changed from the same polarity to the opposite polarity using the lock mechanism 20 and the lock drive mechanism 24.

When the rotating electric machine system 100 has the same polarity, the balls 32a are pushed outward in the radial direction by the outer peripheral surface of the rotation lock shaft 36, and are pushed onto the inner periphery of the second rotor 18, as shown in FIG. 4(a). This is a state in which the hub groove 34a is fitted into the hub groove 34a provided in the engaged hub 34. On the other hand, the ball 32b is fitted into a recess of a groove 36a provided in the rotation lock shaft 36, and does not protrude outward in the radial direction. In this homopolar lock state, the ball 32a and the hub groove 34a are in a fitted state, and the torque of the second rotor 18 is transmitted to the rotating shaft 14 through the ball 32a and the hub 34.

Next, the second rotor 18 is rotated to change the polarity 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), it follows the slope of the groove 36a provided on the outer periphery of the rotation lock shaft 36. The ball 32a can now move in the radial direction. In this state, by controlling the current flowing through the stator coil of the stator 12, a torque (rotation torque) for rotating the second rotor 18 is provided. As a result, the ball 32a is pushed by the hub 34 and disengaged from the hub groove 34a, and the lock is released, and the second rotor 18 starts rotating.

When the rotation operation continues, the second rotor 18 is rotated to the opposite polarity position, and another hub groove 34a provided in the hub 34 moves to the position of the ball 32b. Further, the ball 32b is pushed outward in the radial direction along the slope of the groove 36a of the rotating lock shaft 36, which continues to be pushed, and the ball 32b is fitted into the hub groove 34a of the hub 34. In this reverse polarity lock state, the ball 32b and the hub groove 34a are in a fitted state, and the torque of the second rotor 18 is transmitted to the rotating shaft 14 through the ball 32b and the hub 34.

In addition, when making a transition from a reverse polarity state to a same polarity state using the lock mechanism 20 and the lock drive mechanism 24, the reverse operation may be performed.

Further, in this embodiment, the configuration uses the balls 32 (32a, 32b), but the balls 32 may be changed to other shaped members such as pins.

As described above, in the rotating electric machine system 100 according to the present embodiment, the locked state of the same polarity or the opposite polarity is released by moving the rotating lock shaft 36 in the axial direction, and the rotating shaft 14 is released by energizing the stator 12. On the other hand, by relatively rotating the second rotor 18, it is possible to mutually transition between the same polarity state and the opposite polarity state through the rotation state. Note that the locking function between the rotating shaft 14 and the second rotor 18 can be achieved by rotating the second rotor 18 and continuing to push the rotating lock shaft 36, thereby locking the rotating shaft 14 and the second rotor 18. It can be done passively without the need for additional sensors.

[Second embodiment]
The lock mechanism 20 and lock drive mechanism 24 in the second embodiment will be described with reference to FIGS. 5 to 7. The locking mechanism 20 includes a pin 40, a transmission member 42, and a hub 44. Further, the lock drive mechanism 24 is configured to include a rotation lock shaft 46.

The rotating shaft 14 has a hollow region 14a extending in the axial direction. The rotation lock shaft 46 has a cylindrical shape with a groove 46a on the outer surface. The rotation lock shaft 46 is arranged in a region corresponding to the inner peripheral region of the second rotor 18 in the hollow region 14a of the rotating shaft 14. The rotation lock shaft 46 is provided so as to be movable in the axial direction of the rotating shaft 14 (in the direction of the arrow in FIG. 5) by an external driving force such as an actuator.

Further, a through hole is provided in the rotation shaft 14 in the radial direction at a position corresponding to a movable region of the rotation lock shaft 46, that is, an inner peripheral region of the second rotor 18. The through holes are provided in at least two positions that are shifted along the circumferential direction by a distance suitable for moving a transmission member 42, which will be described later, like a seesaw. In this embodiment, as shown in FIG. 6, through holes are provided at six locations along the circumferential direction of the rotating shaft 14. Furthermore, the through holes that are adjacent to each other along the circumferential direction are provided at alternately shifted positions along the axial direction of the rotating shaft 14 .

The pins 40 (40a, 40b) are filled into the through holes. The pin 40 is movable in the through hole along the radial direction. Note that the pin 40 placed in one of the through holes whose axial positions are shifted from each other is referred to as a pin 40a, and the pin 40 placed in the other side is referred to as a pin 40b.

The transmission member 42 is a plate-shaped 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. The transmission member 42 is disposed between the rotation shaft 14 and the hub 44 in a recess provided on the outer peripheral surface of the rotation shaft 14 . The transmission member 42 is provided with a rotation shaft in the center, and both ends are pushed radially outward by pins 40a and 40b, respectively, so that the transmission member 42 is centered around the rotation shaft in the space between the rotation shaft 14 and the hub 44. It is constructed so that it can move like a seesaw. Furthermore, claws that fit into hub grooves 44a provided on the inner circumferential surface of the hub 44 are provided at both ends of the transmission member 42, respectively.

The hub 44 is a member having a cylindrical shape. The hub 44 is arranged between the rotating shaft 14 and the core of the second rotor 18. The outer circumference of the hub 44 is configured to engage with the inner circumference of the second rotor 18, and the hub 44 rotates together with the second rotor 18.

The inner periphery of the hub 44 is provided with a hub groove 44a into which claws provided at both ends of the transmission member 42 can fit. The hub groove 44a is located at a position where a pawl at one end of the transmission member 42 is fitted in a state where the second rotor 18 has the same polarity as the first rotor 16a and the first rotor 16b, and at a position where the claw at one end of the transmission member 42 is fitted. It is provided at a position into which the claw at the other end of the transmission member 42 is fitted when the second rotor 18 is of opposite polarity to the rotor 16b.

Furthermore, a hub groove 44b is provided on the inner periphery of the hub 44 to further restrict the rotation range. A protrusion (key portion) 14c provided on the outer periphery of the rotating shaft 14 is fitted into the hub groove 44b, and the range of rotation 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. Ru.

Hereinafter, the functions of the lock mechanism 20 and the lock drive mechanism 24 in this embodiment will be explained. Here, an explanation will be given of the operation when the rotating electric machine system 100 is changed from the same polarity to the opposite polarity using the lock mechanism 20 and the lock drive mechanism 24.

As shown in FIGS. 6(a) and 7(a), when the rotating electric machine system 100 has the same polarity, the pin 40a is rotated in the radial direction by the outer peripheral surface of the rotating lock shaft 46, similarly to the first embodiment. is pushed outwardly, pressing one end of the transmission member 42 toward the hub 44. As a result, the claw at the one end of the transmission member 42 is fitted into the hub groove 44a of the hub 44. On the other hand, the pin 40b is fitted into a recessed portion of a groove 46a provided in the rotation lock shaft 36, and does not protrude outward in the radial direction. Further, the protrusion 14c provided on the rotating shaft 14 is in contact with one end of the hub groove 44b of the hub 44.

When the rotating electric machine system 100 is operating as a motor, the first rotor 16 and the second rotor 18 rotate in the forward rotation direction (CCW direction in FIG. 6(a)) and output torque in the forward rotation direction. . During power operation in the homopolar locked state, the power torque of the second rotor 18 is transmitted to the rotary shaft 14 by the protrusion 14c of the rotary shaft 14 that abuts one end in the hub groove 44b of the hub 44. That is, in the powering operation state, no powering torque is applied to the pawl of the transmission member 42. On the other hand, when the rotating electric machine system 100 is performing regenerative operation as a generator, the first rotor 16 and the second rotor 18 rotate in the forward rotation direction, and the regenerative torque is transmitted in the reverse direction (opposite to the CCW direction in FIG. 6(a)). direction). In such a regenerative operation state, the regenerative torque of the second rotor 18 is transmitted to the rotating shaft 14 by the pawl of the transmission member 42 that fits into the hub groove 44a provided in the hub 44.

Next, the second rotor 18 is rotated to change the polarity from the same polarity to the opposite polarity. When the rotation lock shaft 46 is moved along the axial direction by an external force, the pin 40a becomes able to move in the radial direction according to the slope of the groove 46a provided on the outer circumference of the rotation lock shaft 46. Further, the pin 40b is pushed outward in the radial direction according to the slope on the opposite side of the groove 46a provided on the outer circumference of the rotation lock shaft 46. The pin 40b pushes one end of the transmission member 42 radially outward, and the pin 40a, which is now free to move, is pushed back radially inward by the other end of the transmission member 42. As a result, as shown in FIG. 6(b), the transmission member 42 becomes parallel (pin 40a and pin 40b are at approximately the same position in the radial direction), and the transmission member 42 is inserted from the hub groove 44a provided in the hub 44. The claws on both sides are removed and the lock between the second rotor 18 and the rotating shaft 14 is released. Therefore, an increase in the rotational torque required for rotation of the second rotor 18 can be suppressed.

In this state, by controlling the current flowing through the stator coil of the stator 12, a torque (rotation torque) for rotating the second rotor 18 is provided. As a result, the second rotor 18 starts rotating as shown in FIGS. 6(b) and 7(b).

In the rotating state, when the transmission member 42 is in a parallel state, the centrifugal force acting on the pin 40a and the pin 40b is the same, and the force acting on the claw of the transmission member 42 that performs the locking function is the difference between them. The centrifugal force of pin 40b does not act.

Furthermore, if the rotating electric machine system 100 is operated as a motor and is caused to transition from the homopolar locked state to the rotating state, the torque of the second rotor 18 is transmitted to the rotating shaft 14 by the protrusion 14c of the rotating shaft 14. , the claw of the transmission member 42 can transition to the rotating state in a state where no torque is being transmitted. That is, the claws of the transmission member 42 are not pushed from both sides of the rotating shaft 14 and the hub 44 during unlocking, and the force required for unlocking does not increase. If the lock is pressed from both sides, friction will occur on each contact surface, increasing the force required to release the lock. Therefore, it is possible to suppress an increase in the external force required to move the rotation lock shaft 46 in the axial direction.

When the rotation operation continues, the second rotor 18 is rotated to the opposite polarity position as shown in FIGS. Move to position 40b. Further, the pin 40b is pushed outward in the radial direction along the slope of the groove 46a of the rotating lock shaft 46, which continues to be pushed, and presses one end of the transmission member 42 toward the hub 44. As a result, the claw at the one end of the transmission member 42 is fitted into the hub groove 44a of the hub 44. Further, the protrusion 14c provided on the rotating shaft 14 is brought into contact with one end of the hub groove 44b of the hub 44 on the opposite side to that in the homopolar lock state.

When the rotating electric machine system 100 is operating as a motor, the first rotor 16 and the second rotor 18 rotate in the forward rotation direction (CCW direction in FIG. 6(c)) and output torque in the forward rotation direction. . During power operation in the reverse polarity lock state, the power torque of the second rotor 18 is transmitted to the rotating shaft 14 by the pawl of the transmission member 42 that fits into the hub groove 44a provided in the hub 44. On the other hand, when the rotating electric machine system 100 is performing regenerative operation as a generator, the first rotor 16 and the second rotor 18 rotate in the normal rotation direction, and the regenerative torque is transferred in the reverse direction (opposite to the CCW direction in FIG. 6(c)). direction). 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 that abuts one end in the hub groove 44b of the hub 44. That is, in the regenerative operation state, no regenerative torque is applied to the claws of the transmission member 42.

In addition, when making a transition from a reverse polarity state to a same polarity state using the lock mechanism 20 and the lock drive mechanism 24, the reverse operation may be performed. At this time, if the rotating electric machine system 100 is made to transition from the reverse polarity lock state to the rotating state during regenerative operation, torque is transmitted by the protrusion 14c of the rotating shaft 14 and the hub groove 44b of the hub 44, and the torque is transmitted to the transmission member. The pawl 42 allows transition to the rotating state in a state where no torque is being transmitted. That is, the claws of the transmission member 42 are not pushed from both sides of the rotating shaft 14 and the hub 44, and the force required for unlocking is not increased. If the lock is pressed from both sides, friction will occur on each contact surface, increasing the force required to release the lock. Therefore, it is possible to suppress an increase in the external force required to move the rotation lock shaft 46 in the axial direction.

As described above, in the rotating electric machine system 100 according to the second embodiment, the locked state of the same polarity or the opposite polarity is released by moving the rotating lock shaft 46 in the axial direction, and the rotating shaft is moved by energizing the stator 12. By rotating the second rotor 18 relative to the rotor 14, it is possible to transition between the same polarity state and the opposite polarity state. Note that the locking function between the rotating shaft 14 and the second rotor 18 can be achieved passively by continuously pressing the rotating lock shaft 46 without requiring any external mechanism or additional sensor other than the lock mechanism 20 and the lock drive mechanism 24. It is possible to do so.

Further, even when the rotating shaft 14, the first rotor 16, and the second rotor 18 are rotating at high speed, the centrifugal force acting on the pin 40 and the transmission member 42 included in the locking mechanism 20 is balanced, and the lock is not released. Necessary external force can be suppressed. Furthermore, mechanical damage to the pin 40 and the transmission member 42 can be suppressed.

[Third embodiment]
The lock mechanism 20 and lock drive mechanism 24 in the third embodiment will be described with reference to FIGS. 8 to 11. The locking mechanism 20 includes a pin 50, a transmission plate 52, and a hub 54. Further, the lock drive mechanism 24 is configured to include a rotation lock shaft 56.

The rotating shaft 14 has a hollow region 14a extending in the axial direction. The rotation lock shaft 56 has a cylindrical shape and includes a pin hole 56a into which the pin 50 included in the lock mechanism 20 is inserted. The rotation lock shaft 56 is arranged in a region corresponding to the inner peripheral region of the second rotor 18 in the hollow region 14a of the rotating shaft 14. The rotation lock shaft 56 is provided so as to be movable in the axial direction of the rotating shaft 14 (in the direction of the arrow in FIG. 8) by an external driving force such as an actuator.

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 rotating shaft 14, the pin 50 also moves in the axial direction together with the rotation lock shaft 56.

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. The transmission plate 52 is a plate-shaped member, as shown in FIG. The transmission plate 52 is disposed within a through hole 56b provided radially through the central axis of the rotation lock shaft 56. The transmission plate 52 is movable in the radial direction of the rotation shaft 14 (rotation lock shaft 56) within the through hole 56b.

As shown in FIG. 11, the transmission plate 52 is provided with a guide hole 52a through which the pin 50 passes. The guide hole 52a is provided along a direction oblique to both the axial direction and the radial direction of the rotation shaft 14 when the transmission plate 52 is arranged in the through hole 56b of the rotation lock shaft 56. That is, when the pin 50 moving together with the rotation lock shaft 56 is passed through the guide hole 52a and the pin 50 moves in the axial direction together with the rotation lock shaft 56, the transmission plate 52 moves in the direction shown in FIG. guided in the direction of the arrow.

The hub 54 is a member having a cylindrical shape. The hub 54 is arranged between the rotating shaft 14 and the core of the second rotor 18. The outer circumference of the hub 54 is configured to engage with the inner circumference of the second rotor 18, and the hub 54 rotates together with the second rotor 18.

Hub grooves 54a are provided on the inner periphery of the hub 54, into which both ends of the transmission plate 52 can fit. The hub groove 54a is located at a position where a pawl at one end of the transmission plate 52 fits when the second rotor 18 has the same polarity as the first rotor 16a and the first rotor 16b, and at a position where the claw at one end of the transmission plate 52 is fitted. The transmission plate 52 is provided at a position into which a claw at the other end of the transmission plate 52 is fitted in a state where the second rotor 18 has a reverse polarity with respect to the rotor 16b.

Furthermore, a hub groove 54b is provided on the inner periphery of the hub 54 to further restrict the rotation range. A protrusion (key part) 14c provided on the outer periphery of the rotating shaft 14 is fitted into the hub groove 54b, and the range of rotation 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. Ru.

Hereinafter, the functions of the lock mechanism 20 and the lock drive mechanism 24 in this embodiment will be explained. Here, an explanation will be given of the operation when the rotating electric machine system 100 is changed from the same polarity to the opposite polarity using the lock mechanism 20 and the lock drive mechanism 24.

As shown in FIGS. 9(a) and 10(a), when the rotating electric machine system 100 has the same polarity, the pin 50 is located at one end of the guide hole 52a (lower end in FIG. 10(a)). An external force is applied to the rotation lock shaft 56 in this manner. The pin 50 passed through the guide hole 52a pushes the transmission plate 52 upward (upwards in FIGS. 9(a) and 10(a)) and presses 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. Further, the protrusion 14c provided on the rotating shaft 14 is in contact with one end of the hub groove 54b of the hub 54.

When the rotating electric machine system 100 is operating as a motor, the first rotor 16 and the second rotor 18 rotate in the forward rotation direction (CCW direction in FIG. 9(a)) and output torque in the forward rotation direction. . During power operation in the homopolar locked state, the power torque of the second rotor 18 is transmitted to the rotary shaft 14 by the protrusion 14c of the rotary shaft 14 that abuts one end in the hub groove 54b of the hub 54. That is, in the powering operation state, no powering torque is applied to the end portion of the transmission plate 52. On the other hand, when the rotating electric machine system 100 is performing regenerative operation as a generator, the first rotor 16 and the second rotor 18 rotate in the forward direction, and the regenerative torque is transmitted in the reverse direction (opposite to the CCW direction in FIG. 9(a)). direction). In such a regenerative operation state, the regenerative torque of the second rotor 18 is transmitted to the rotating shaft 14 by the end of the transmission plate 52 that fits into the hub groove 54a provided in the hub 54.

Next, the second rotor 18 is rotated to change the polarity 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 also moves together with the rotation lock shaft 56, and the transmission plate 52 is pushed down along the slope of the guide hole 52a (FIG. 9). (b) and downward direction in FIG. 10(b)). Accordingly, the end of the transmission plate 52 comes off the hub groove 54a, and the lock between the second rotor 18 and the rotating shaft 14 is released. Therefore, an increase in the rotational torque required for rotation of the second rotor 18 can be suppressed.

In this state, by controlling the current flowing through the stator coil of the stator 12, a torque (rotation torque) for rotating the second rotor 18 is provided. As a result, the rotational movement of the second rotor 18 is started, as shown in FIGS. 9(b) and 9(b).

Furthermore, if the rotating electric machine system 100 is operated as a motor and is caused to transition from the homopolar locked state to the rotating state, the torque of the second rotor 18 is transmitted to the rotating shaft 14 by the protrusion 14c of the rotating shaft 14. , it is possible to transition to a rotating state in a state where no torque is transmitted by the end of the transmission plate 52. That is, the transmission plate 52 is not pushed from the hub groove 54a of the hub 54 during unlocking, and the force required for unlocking does not increase. When pressed, friction occurs on the abutting surfaces, increasing the force required to release the lock. Therefore, it is possible to suppress an increase in the external force required to move the rotation lock shaft 56 in the axial direction.

When the rotation operation continues, the second rotor 18 is rotated to the opposite polarity position, as shown in FIGS. 9(c) and 10(c), and another hub groove 54a provided in the hub 54 transmits Move to the position of plate 52. Further, the pin 50 moves together with the rotating lock shaft 56 that continues to be pushed, and the pin 50 is located at one end of the guide hole 52a (the upper end in FIG. 10(c)). As a result, the end of the transmission plate 52 is fitted into the hub groove 54a of the hub 54. Further, the protrusion 14c provided on the rotating shaft 14 comes into contact with one end of the hub groove 54b of the hub 54 on the opposite side from when the same polarity is locked.

When the rotating electric machine system 100 is operating as a motor, the first rotor 16 and the second rotor 18 rotate in the forward rotation direction (CCW direction in FIG. 9(c)) and output torque in the forward rotation direction. . During power operation in the reverse polarity lock state, the power running torque of the second rotor 18 is transmitted to the rotating shaft 14 by the end of the transmission plate 52 that fits into the hub groove 54a provided in the hub 54. On the other hand, when the rotating electric machine system 100 is performing regenerative operation as a generator, the first rotor 16 and the second rotor 18 rotate in the forward rotation direction, and the regenerative torque is transferred in the reverse direction (opposite to the CCW direction in FIG. 9(c)). direction). 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 that abuts one end in the hub groove 54b of the hub 54. That is, in the regenerative operation state, no regenerative torque is applied to the end portion of the transmission plate 52.

In addition, when making a transition from a reverse polarity state to a same polarity state using the lock mechanism 20 and the lock drive mechanism 24, the reverse operation may be performed. At this time, if the rotating electrical machine system 100 is in regenerative operation and is caused to transition from the reverse polarity lock state to the rotating state, torque is transmitted by the protrusion 14c of the rotating shaft 14 and the hub groove 54b of the hub 54, and the transmission plate The end portion of 52 allows transition to a rotating state in a state where no torque is transmitted. That is, the transmission plate 52 is not pushed from the hub groove 54a of the hub 54, and the force required for unlocking is not increased. When pressed, friction occurs on the abutting surfaces, increasing the force required to release the lock. Therefore, it is possible to suppress an increase in the external force required to move the rotation lock shaft 56 in the axial direction.

As described above, in the rotating electric machine system 100 according to the third embodiment, the locked state of the same polarity or the opposite polarity is released by moving the rotating lock shaft 56 in the axial direction, and the rotating shaft is moved by energizing the stator 12. By rotating the second rotor 18 relative to the rotor 14, it is possible to transition between the same polarity state and the opposite polarity state. Note that the locking function between the rotating shaft 14 and the second rotor 18 can be achieved passively by continuously pressing the rotating lock shaft 56 without requiring any external mechanism or additional sensor other than the lock mechanism 20 and the lock drive mechanism 24. It is possible to do so.

Moreover, a locked state and an unlocked state can be realized by a simple configuration using the transmission plate 52. Furthermore, since the transmission plate 52 is disposed at the center of the second rotor 18 during rotation, the structure is not easily affected by centrifugal force due to rotation.

Note that in the rotating electric machine system 100 in the first to third embodiments described above, the lock mechanism 20 and the lock drive mechanism 24 are arranged inside the second rotor 18, and the rotational movement is directed to the stator 12. The same polarity state and the opposite polarity state can be realized without increasing the volume of the rotating electric machine system 100 because of the energization of the rotary electric machine system 100. Further, there is no need for detection means or control of the skew angle for locking.

As shown in FIG. 12, an elastic body 60 such as a spring may be provided in the hollow part of the rotating shaft 14 to continue applying force from one side along the axial direction to the rotating lock shaft 56. good. By providing the elastic body 60 such as a spring, it becomes possible to continue applying an external force to the rotating lock shaft 56 from one side. This makes it possible to maintain the same polarity lock state or the reverse polarity lock state even when the actuator or the like that externally drives the rotation lock shaft 56 of the rotating electric machine system 100 is stopped. Note that the same configuration can be applied to the rotating electrical machine system 100 in the first embodiment and the second embodiment.

Without providing a special actuator to the mechanism that applies external force to the rotation lock shaft 56, the mechanism can also be operated using, for example, oil pressure of lubricating oil used for bearings, gears, etc. In this case, since the existing lubricating oil pump can be used, there is no need to add a mechanism such as an actuator that applies driving force from the outside, and the entire system can be made smaller.

[Control of rotating electrical machine system]
By the way, 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 force) generated by the magnet (field) increases. . As a result, for example, when the rotating electric machine system 100 is driven by an inverter, if the induced voltage exceeds the withstand voltage of the switching element, the switching element may be damaged. Therefore, it is necessary to simultaneously increase the torque in the rotating electric machine system 100 and suppress the back electromotive force to below the upper limit.

In the following description, the number of rotations means the number of times (rotational speed) that the first rotor 16 or the second rotor 18 rotates per unit time. For example, the unit of revolutions per minute is rpm.

For example, by setting the axial division ratio between the first rotor 16a and the first rotor 16b and the second rotor 18 to be 4:1, and rotating the second rotor 18 at half the rotation speed of the upper limit rotation speed, the magnetic poles are When 1/4 is changed from the same polarity to opposite polarity, the magnetic fluxes due to the N and S poles cancel each other out in the axial half. As a result, the field magnetic flux is halved and the back electromotive force is also halved, making it possible to control the switching elements without damaging them even during high-speed rotation. 13(a) and 13(b) show changes in the back electromotive force ratio and the torque ratio with respect to the rotational speed of the first rotor 16 and the second rotor 18 in this case. In the drivable region of the rotating electric machine system 100, the torque at low speed can be increased compared to the comparison motor.

Rotation control of the second rotor 18 suitable for the rotating electric machine system 100 is as follows. Up to the rotational speed N1, the first rotor 16 and the second rotor 18 are driven with the same polarity and accelerated by the power running torque.

When the rotational speed reaches the rotational speed N1, a transition is made to rotation control mode 1 in which the second rotor 18 is rotated from the same polarity to the opposite polarity. In rotation control mode 1, while maintaining the torque (output torque) output to the rotating shaft 14, a rotation torque for rotating the second rotor 18 relative to the first rotor 16 is simultaneously output. to perform the rotation operation. Specifically, in the same polarity state, output torque is output by both the first rotor 16 and the second rotor 18, and during the rotation operation in rotation control mode 1, the output torque is maintained by the first rotor 16. At the same time, the current flowing through the stator coil of the stator 12 is controlled so that the second rotor 18 outputs rotational torque.

In this manner, when the rotational speed is equal to or higher than N1, the rotating electrical machine system 100 is driven with the second rotor 18 having the opposite polarity with respect to the first rotor 16.

If a brake operation is performed on the vehicle while driving with the opposite polarity, deceleration occurs due to regenerative torque. When the rotational speed reaches N2 due to deceleration, a transition is made to rotation control mode 2 in which the second rotor 18 is rotated from the opposite polarity to the same polarity. In rotation control mode 2, similarly to rotation control mode 1, rotation operation is performed by simultaneously outputting rotation torque while maintaining output torque. Specifically, when the polarity is reversed, both the first rotor 16 and the second rotor 18 output torque, and during the rotation operation in rotation control mode 2, the output torque is maintained by the first rotor 16. At the same time, the current flowing through the stator coil of the stator 12 is controlled so that the second rotor 18 outputs rotational torque.

In this manner, when the rotational speed is equal to or lower than N2, the rotating electrical machine system 100 is driven with the second rotor 18 being of the same polarity as the first rotor 16.

Here, if the rotational speed N1 and the rotational speed N2 are set to be the same, there is a possibility that a chattering phenomenon will occur in which the rotating operation from the same polarity to the opposite polarity or from the opposite polarity to the same polarity is repeated in the vicinity of the rotational speed. Therefore, it is preferable to set the rotation speed N1>rotation speed N2. In this way, the chattering phenomenon is suppressed by providing hysteresis in the rotation speed N1, which is the reference for starting the rotation operation from the same polarity to the opposite polarity, and the rotation speed N2, which is the reference for starting the rotation operation from the opposite polarity to the same polarity. can do.

Furthermore, compared to the rotation operation from the same polarity to the opposite polarity, the rotation torque that can be output while maintaining the output torque in the rotation operation from the opposite polarity to the same polarity is smaller, and the conditions under which rotation operation is possible are limited. Therefore, it is preferable to add not only the rotation speed constraint (rotation speed N2) but also a torque constraint as a condition for shifting to the rotation control mode 2 from the opposite polarity to the same polarity. That is, it is preferable to shift to the rotation control mode 2 under the conditions that the rotational speed of the first rotor 16 and the second rotor 18 is the rotational speed N2 or less, and the output torque is the reference torque T2 or less. .

In particular, in a situation where the rotating electric machine system 100 is in a regenerative operation with reverse polarity and the rotational speed of the first rotor 16 and the second rotor 18 is decreasing from the rotational speed N1, the rotation control mode 2 is not selected. First, during the regeneration operation, the rotating electric machine system 100 is driven in a reverse polarity state. After that, when re-acceleration is performed and the system shifts to a power running state, or when the rotating electric machine system 100 stops, the output torque becomes 0 or crosses 0 and shifts from negative regenerative torque to positive power running torque. I will do it. Therefore, it is preferable to shift to the rotation control mode 2 and perform the rotation operation when the output torque is at or near zero. Note that the closer the output torque is to 0, the larger the rotational torque can be output, so it becomes easier to rotate the second rotor 18 from the opposite polarity to the same polarity with respect to the first rotor 16.

FIG. 14 shows the rotation speed, phase difference angle, output torque, torque of the first rotor 16 (main rotor torque), and An example of a temporal change in the torque of the second rotor 18 (rotating rotor torque) is shown. The torque (output torque, main rotor torque, rotating rotor torque) is a value calculated by magnetic field analysis. These characteristics show the results when the maximum current is below the upper limit.

These results show that rotational motion can be achieved while maintaining the output torque at a predetermined value. In addition, the same polarity lock state is released and the control of the current flowing to the stator coil of the stator 12 is switched to shift to rotation control mode 1, and the current control condition is changed according to the phase difference angle. The second rotor 18 can be rotated by the torque (rotation torque) of the second rotor 18 while maintaining the output torque (output torque) by the torque (main rotor torque) of the rotor 16. Further, after the rotation operation is completed, the reverse polarity lock state is established, and the control of the current applied to the stator coil of the stator 12 is also changed at that time.

Figures 15 and 16 show examples of changes in rotational torque from the same polarity to the opposite polarity and from the opposite polarity to the same polarity with respect to the rotation speed while the output torque (output torque) is maintained at a predetermined value. Indicates the conditions (area) under which the operation is possible. In FIGS. 15 and 16, the conditions indicated by the mark x indicate conditions suitable for switching to rotational operation. Symbol (1) indicates conditions suitable for transition to rotation control mode 1, and symbols (2) and (3) indicate conditions suitable for transition to rotation control mode 2. Note that symbol (2) indicates a condition in which the number of revolutions is equal to or less than number N2, and symbol (3) indicates a condition in which the number of revolutions becomes equal to or less than number N2, and in addition to a condition in which the torque becomes near 0. shows.

Moreover, FIGS. 17 and 18 show a method of suppressing torque shock accompanying the rotational movement of the second rotor 18. As shown in FIG. 17, when increasing the rotation speed in a state where the output torque is maximum in the rotating electric machine system 100, when the rotation speed is changed from the same polarity state to the opposite polarity state at a predetermined rotation speed, a torque gap occurs at the time of switching. Therefore, there is a possibility that torque shock may occur in the rotating electric machine system 100. Therefore, as shown in FIG. 18, it is preferable to perform control to limit the drive range so as to reduce the output torque of the rotating electrical machine system 100 before transitioning from the same polarity state to the opposite polarity state at a predetermined rotation speed. be. For example, after controlling the current to the stator coil of the stator 12 so that the output torque becomes the maximum torque in the reverse polarity state, control is performed to transition from the same polarity state to the reverse polarity state. Thereby, it is possible to prevent a torque gap from occurring when switching from the same polarity to the opposite polarity, and to suppress torque shock in the rotating electrical machine system 100.

As described above, in the rotating electrical machine system 100, torque is transmitted by the protrusion 14c provided on the rotating shaft 14 when the rotating electrical machine system 100 is in the homopolar state and the power running state. In this state where torque is transmitted by the protrusion 14c, no torque is applied to the locking mechanism 20, so the lock can be released by moving the lock drive mechanism 24 with an external force. At this time, since the output torque of the first rotor 16 and the second rotor 18 is transmitted by the protrusion 14c, the output torque does not decrease due to unlocking. On the other hand, in a regenerative state where the output torque is in the opposite direction, the lock mechanism 20 transmits the torque. In this state where the lock mechanism 20 is transmitting torque, torque is applied to the lock mechanism 20, and therefore the lock cannot be released simply by moving the lock drive mechanism 24 with an external force. Therefore, when making a transition from the same polarity state to the opposite polarity state, it is performed when the rotating electric machine system 100 is in the power running state.

FIG. 19 shows a flowchart of control for transitioning from the same polarity state to the opposite polarity state. Hereinafter, with reference to the flowchart, control for transitioning the rotating electric machine system 100 from the homopolar state to the opposite polarity state will be described.

In step S10, normal drive control is performed in the same polarity state. In step S12, it is determined whether the rotational speed is equal to or higher than the rotational speed N1. If the rotational speed is greater than or equal to the rotational speed N1, the process proceeds to step S14, and if it is less than the rotational 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 is released, the process proceeds to step S18, and if the lock is not released, the process returns to step S14 to continue driving the lock drive mechanism 24. Detection of unlocking can be performed using a sensor. For example, the position of the rotation lock shaft can be detected by a sensor, and the locked state or unlocked state can be detected based on the position of the rotation lock shaft.

In step S18, the second rotor 18 is rotated relative to the first rotor 16. At this time, the drive of the lock drive mechanism 24 is continued. In step S20, it is determined whether locking is 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 a reverse polarity state. If the locking is completed, the process moves to step S22, and if the locking is not completed, the process is repeated from step S18. In step S22, normal drive control is started in the reverse polarity state.

The transition from the opposite 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 opposite polarity state is performed in step S10, and normal control in the same polarity state is performed in step S22. Further, in the determination in step S12, the condition may be that the rotational speed is equal to or lower than the rotational speed N2. Furthermore, a condition in which the torque becomes close to 0 may be added to the condition.

10 Housing, 12 Stator, 14 Rotating shaft, 14a Hollow region, 14b Through hole, 14c Projection (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 rotation 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 (5)

A rotating electric machine comprising a stator and a rotor disposed opposite to the stator,
The rotor is divided into a first rotor fixed to a rotating shaft and the first rotor along the axial direction of the rotating shaft, and rotates relative to the first rotor about the rotating shaft as a rotation center. a movable second rotor;
Equipped with
It is possible to switch between a locked state in which the rotation shaft and the second rotor rotate together, and a rotation state in which the second rotor is rotated relative to the rotation shaft,
On the condition that the rotational speed of the first rotor becomes equal to or higher than a first reference rotational speed, the second rotor is rotated relative to the first rotor while maintaining the output torque to change the polarity from the same polarity state to the opposite polarity state. A rotating electrical machine characterized by controlling a state to transition. A rotating electric machine comprising a stator and a rotor disposed opposite to the stator,
The rotor is divided into a first rotor fixed to a rotating shaft and the first rotor along the axial direction of the rotating shaft, and rotates relative to the first rotor about the rotating shaft as a rotation center. a movable second rotor;
Equipped with
It is possible to switch between a locked state in which the rotation shaft and the second rotor rotate together, and a rotation state in which the second rotor is rotated relative to the rotation shaft,
On the condition that the rotational speed of the first rotor becomes equal to or less than a second reference rotational speed, the second rotor is rotated relative to the first rotor while maintaining the output torque to change the polarity from the opposite polarity state to the same polarity state. A rotating electrical machine characterized by controlling a state to transition. The rotating electric machine according to claim 2,
Furthermore, on the condition that the output torque becomes equal to or less than a reference torque, control is performed to rotate the second rotor relative to the first rotor to transition from a reverse polarity state to a same polarity state while maintaining the output torque. A rotating electrical machine characterized by performing the following. The rotating electrical machine according to any one of claims 1 to 3,
comprising a sensor for detecting whether the locked state is the locked state or the locked state is released;
A rotating electric machine characterized in that, after the sensor detects that the locked state is released, the second rotor is brought into a rotating state in which the second rotor is rotated relative to the rotating shaft. The rotating electric machine according to any one of claims 1 to 4,
After the sensor detects that the locked state changes from the unlocked state, normal control is performed to rotate the first rotor and the second rotor together from the rotating state. A rotating electric machine characterized by: