JP2007174757A - Stator-rotatable rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a rise in the induction voltage of a rotating electric machine without using slightly weak magnetic field control. <P>SOLUTION: In this stator-rotatable rotating electric machine 1 that comprises a stator 5 rotatably supported to a case 2, and a first brake 7 for fixing the stator 5 to the case 2, a differential gear 14 having at least three pieces of rotating elements s, c and r are arranged, one rotating element c among the three rotating elements is drive-coupled to the stator 5, and the other one rotating element s is drive-coupled to a rotor 11 of the rotating electric machine 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a technique for reducing an induced voltage generated in a rotating electrical machine.

In a rotating electrical machine with a permanent magnet, the induced voltage increases excessively when the output shaft rotates at a high speed, adversely affecting the inverter and battery, and back electromotive force is generated to produce a motor. Problems such as a decrease in the output efficiency and demagnetization of the permanent magnet occur. Therefore, conventionally, as a means for preventing the increase of the induced voltage, it has been usual to use field-weakening control as in the invention described in Patent Document 1, for example.
On the other hand, since field weakening control has a problem of impairing the power factor of the rotating electrical machine, an invention for avoiding an increase in induced voltage without performing field weakening control is disclosed in, for example, Patent Document 2. The driving device described in Patent Document 2 supports a stator rotatably on an outer casing in a rotating electrical machine constituted by a rotor having a permanent magnet and a stator having a coil. And while driving a rotary electric machine as a motor, an engagement mechanism is fastened and a stator is fixed so that rotation is impossible. On the contrary, while the rotating electrical machine is not driven as a motor, the engaging mechanism is released to allow the stator to rotate. As a result, the relative rotational speed between the stator and the rotor is reduced to avoid an excessive increase in the induced voltage, thereby preventing the generation of counter electromotive force.
JP-A-10-262359 JP-A-2005-124253

However, the conventional rotating electric machine described in Patent Document 2 has the following problems. In other words, since the engagement mechanism is alternatively selected from fastening or releasing, only one state of driving as a motor or not driving at all is selected, and the induced voltage is suppressed. However, there is a problem that the drive operation cannot be performed with the output shaft rotation speed set to a high rotation range.
In the rotating electrical machine described in Patent Document 2, the relative rotational speed between the stator and the rotor becomes uncontrollable while the engagement mechanism is released. There arises a problem that energy cannot be regenerated even while traveling. Here, even if the engagement mechanism is set to the half-clutch state and the relative rotational speed between the stator and the rotor is controlled, the energy is converted into heat by the engagement mechanism and disappears if the half-clutch state is set. As a result, the energy regeneration efficiency deteriorates.

  In view of the above circumstances, the present invention proposes a stator-rotating type rotating electrical machine capable of controlling the relative rotational speed between the stator and the rotor in accordance with the rotational speed of the output shaft of the rotating electrical machine.

For this purpose, the stator rotating type rotating electric machine according to the present invention is as described in claim 1,
In a stator rotatable type rotating electrical machine comprising a stator rotatably supported by a case and a first brake device for fixing the stator to the case,
A differential having at least three rotating elements is provided, of which one rotating element and the stator are drivingly coupled, and the other one rotating element and the rotor of the rotating electrical machine are drivingly coupled. It is a feature.

According to the configuration of the present invention, since the stator and the rotor are drive-coupled by the differential device, when the rotor rotates at high speed, the first brake device is released to make the stator freely rotatable, and this differential device is controlled. The relative rotational speed between the stator and the rotor can be determined, and the relative rotational speed can be reduced even when the absolute rotational speed of the output shaft is high. Therefore, as in the prior art, it is possible to suppress the induced voltage without performing field-weakening control, and it is possible to operate with the output shaft speed in the high rotation range.
For this reason, the beneficial effect that the induced voltage can be suppressed and the operation of the rotating electrical machine (drive operation and regenerative operation) can be performed simultaneously is obtained.
Even when traveling on a downhill road or traveling at a reduced speed, energy can be regenerated while suppressing the induced voltage, and the battery can be charged.

Hereinafter, embodiments of the present invention will be described in detail based on examples shown in the drawings.
FIG. 1 is a longitudinal sectional view showing a stator rotatable type rotating electrical machine 1 according to a first embodiment of the present invention in a cross section in a plane including a rotating shaft.
The case 2 that forms the outer shell of the rotating electrical machine 1 supports the stator 5 rotatably through bearings 3 and 4 in its inner space. The stator 5 has a hollow cylindrical shape, and a plurality of coil windings 6 are arranged in the circumferential direction on the inner peripheral side thereof.

  A first brake 7 for fixing the stator 5 to the case 2 is provided between the outer periphery of the stator 5 and the inner periphery of the case 2, and a slip ring 8 for electrically connecting the stator 5 to an external power source is provided.

  In the first brake 7, a spline groove (not shown) extending in the axis O direction is formed on the inner wall of the case 2, and a plurality of ring-shaped clutch plates are fitted into the spline groove. The clutch plate is splined to the case 2 so as to be movable in the direction of the axis O and immovable in the circumferential direction. Similarly, the clutch plate is also spline fitted to the outer wall of the stator 5. When the stator 5 is fixed, the piston plate (not shown) presses the clutch plate on the case 2 side and the clutch plate on the stator 5 side to execute fastening. On the other hand, if the stator 5 is not fixed, the first brake 7 is released without performing the above pressing.

  The slip ring 8 is connected to a high-voltage harness (not shown), an inverter, and a battery outside the case 2. The slip ring 8 is connected to the coil winding 6 in the stator 5. While the stator 5 is rotating relative to the case 2, the slip ring 8 and the coil winding 6 are energized while the slip ring 8 slides.

Both ends of the stator 5 in the direction of the axis O support the center shafts 12 and 13 of the rotor 11 via bearings 9 and 10 so as to be rotatable.
Central shafts 12 and 13 extending in the direction of the axis O are integrally coupled to the rotor 11. The rotor 11 includes a plurality of permanent magnets, and generates torque (magnet torque and reluctance torque) by an electromagnetic action between the rotor 11 and the coil winding 6 to rotate. These torque and rotation outputs are transmitted to the center shafts 12 and 13 (also referred to as output shaft 13).
The output shaft 13 is drivingly coupled to a load such as a wheel on the tip side (not shown).

  The tip of the central shaft 12 protruding from the rotor 11 side is coupled to the sun gear s of the planetary gear set 14. The sun gear s and the ring gear r of the planetary gear set 14 have the axis O as the center of rotation. Between the sun gear s and the ring gear r, a plurality of planetary gears p are arranged in the circumferential direction of the axis O. A plurality of planetary gears p that mesh with the outer peripheral teeth of the sun gear s and the inner peripheral teeth of the ring gear r are connected by a common carrier c. The carrier c is coupled to the stator 5. As a result, the carrier c defines the relative positional relationship between the planetary gears p and also allows the planetary gears p to rotate while taking out the revolution of the planetary gears p around the axis O as a rotational motion. Match.

The planetary gear set 14 is accommodated outside the stator 5 and in the case 2. A first brake 19 for fixing the ring gear r to the case 2 is provided between the outer periphery of the ring gear r and the inner periphery of the case 2.
Similarly to the first brake 7, the first brake 19 is configured by spline fitting a plurality of ring-shaped clutch plates. The clutch plate is fitted to the case 2 and the ring gear r so as to be movable in the direction of the axis O and immovable in the circumferential direction. When the ring gear r is fixed, the clutch plates are pressed together by a piston mechanism (not shown) to execute the fastening. On the other hand, if the ring gear r is not fixed, the first brake 19 is released without pressing.

  The rotor 11 rotates relative to the stator 5. As shown in FIG. 1, since the output shaft 13 is integrally coupled to the rotor 11, the absolute rotational speed of the rotor 11 is equal to the rotational speed of the output shaft 13.

When the absolute rotational speed of the rotor 11 is low and medium, the first brake 19 is released to freely rotate the ring gear, and the first brake 7 is fastened to fix the stator 5 so that it cannot rotate. By setting the rotational speed of the stator 5 to 0, the rotational speed of the output shaft 13 becomes equal to the relative rotational speed between the stator 5 and the rotor 11.
As a result, an induced voltage proportional to the absolute rotational speed of the rotor 11 is generated in the coil winding 6.

When the absolute rotation number of the rotor 11 is high, the first brake 19 is fastened to fix the ring gear r so that it cannot rotate, and the first brake 7 is released to make the stator 5 free to rotate. By setting the rotation speed of the ring gear r to 0, the planetary gear set 14 brings the relative rotation speed between the sun gear s and the carrier c into a relationship represented by a collinear diagram described later. The relative rotational speed here is configured to be smaller (close to 0) than the absolute rotational speed of the sun gear s. As shown in FIG. 1, the sun gear s is drivingly coupled to the rotor 11, and the carrier c is drivingly coupled to the stator 5. Therefore, in the first embodiment, the relative rotational speed between the stator 5 and the rotor 11 can be made smaller than the absolute rotational speed of the rotor 11.
As a result, an induced voltage proportional to the relative rotational speed of the rotor 11 is generated in the coil winding 6, and even if the absolute rotational speed of the rotor 11 is high, it can be avoided that the induced voltage becomes high. And the fall of the output efficiency as a motor and the demagnetization of a permanent magnet can be avoided.

  Whether or not the absolute rotational speed of the rotor 11 is high is determined by, for example, providing a rotational speed detection sensor such as a resolver on the output shaft 13 and the detected rotational speed is equal to or greater than a predetermined value stored in advance. If so, it is determined that the rotation is high. Alternatively, a voltage sensor that directly detects the induced voltage of the coil 6 is provided, and if the detected induced voltage is equal to or higher than the withstand voltage performance of the inverter 22, it is determined that the rotation is high.

The rotational speeds of the rotary elements s, r, and c constituting the planetary gear set 14 are shown in a collinear diagram in FIG.
When the rotation speed of the sun gear s, which is the same as the absolute rotation speed of the rotor 11, is a low / medium rotation n1,
Since the first brake 7 is engaged and the rotation speed of the carrier c is kept at 0, the rotation speeds of the rotation elements s, r, c are in the relationship of the lever α.

A case will be described in which the rotation speed of the sun gear s increases from the low / medium rotation n1 to the high rotation n2 as indicated by β in FIG. If the first and second brake devices 7 and 19 are engaged and released as described above, the rotational speeds of the rotary elements s, r, and c are in the relationship of the lever γ, and the relative rotation between the rotor 11 and the stator 5 is achieved. The problem is that the number becomes high rotation n2 and the induced voltage becomes large. Since a problem occurs when the relative rotational speed is high, x is added to the relative rotational speed n2 shown in FIG.
Therefore, the first brake 7 is released to release the rotation restriction of the carrier c, and the second brake 19 is engaged to set the rotation speed of the ring gear r to zero. As a result, the rotational speeds of the rotating elements s, r, and c are in the relationship of the lever δ, and the relative rotational speed between the rotor 11 and the stator 5 can be reduced from the high speed n2 to the medium speed n3. Therefore, the induced voltage can be suppressed.

  The relative rotational speed control control means for controlling the relative rotational speed between the rotor 11 and the stator 5 as described above may be a controller (not shown) that controls the target torque and the target rotational speed of the rotating electrical machine 1. .

  Next, a second embodiment of the stator rotatable type rotating electrical machine according to the present invention will be described. Here, members that are the same as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted, and different members are newly described by adding reference numerals.

  FIG. 3 is a longitudinal sectional view showing a stator rotatable type rotating electrical machine 21 according to a second embodiment of the present invention in a cross section in a plane including a rotating shaft.

Central shafts 12 and 15 extending in the direction of the axis O are integrally coupled to the rotor 11.
Both ends of the stator 5 in the direction of the axis O support the center shafts 12 and 15 via bearings 9 and 10 so as to be rotatable. The output from the torque and rotation of the rotor 11 is transmitted to the central shafts 12 and 15.

A planetary gear set 14 is drivingly coupled to the central shaft 15. The planetary gear set 14 is accommodated between the outer wall of the stator 5 and the inner wall of the case 2.
The tip of the central shaft 15 protruding from the rotor 11 side is coupled to the sun gear s of the planetary gear set 14. The sun gear s and the ring gear r of the planetary gear set 14 have the axis O as the center of rotation. Between the sun gear s and the ring gear r, a plurality of planetary gears p are arranged in the circumferential direction of the axis O. A plurality of planetary gears p that mesh with the outer peripheral teeth of the sun gear s and the inner peripheral teeth of the ring gear r are connected by a bearing support portion 5 c of the stator 5 that supports the bearing 10. That is, the bearing support portion 5 c also serves as a carrier for the planetary gear set 14. As a result, the carrier 5c defines the relative positional relationship between the planetary gears p, and also allows the planetary gears p to rotate while taking out the revolution of the planetary gears p around the axis O as a rotational motion. Match.

  One end of the output shaft 13 is coupled to the side opposite to the central shaft 15 when viewed from the sun gear s. The output shaft 13 is drivingly coupled to the wheel at the other end (not shown) and transmits the output of the rotating electrical machine 21 to the wheel. That is, the other end of the output shaft 13 is connected to a load.

  An inverter 22 is individually provided on the bearing support portion 5 a of the stator 5 on the side opposite to the output shaft 13 when viewed from the rotor 11. The inverter 22 is provided with a battery 23. The inverter 22 and the battery 23 are located between the outer wall of the bearing support portion 5 a and the inner wall of the case 2. During the driving of the rotating electrical machine 21, the battery 23 is discharged and supplies power to the coil winding 6 through the inverter 22. During regeneration of the rotating electrical machine 21, the battery 23 is supplied with electric power from the coil winding 6 through the inverter 22 and charges the battery 23.

  The inverter 22 is connected to a controller (not shown), and the controller gives a drive command and a regeneration command for the rotating electrical machine 21 to the inverter 22.

  The rotational speeds of the rotary elements s, r, and 5c constituting the planetary gear set 14 are shown in a collinear chart in FIG. 2 and have the same effects as in the first embodiment.

Further, in the rotating electrical machine 21 of the second embodiment, the inverter 22 and the battery 23 are coupled to the stator 5 as shown in FIG.
That is, since the inverter 22 and the battery 23 rotate integrally with the stator 5, the mass of the stator 5 increases and the moment of inertia of the carrier 5c increases. Therefore, by rotating the stator 5 as shown by the lever δ in FIG. 2, the rotational energy can be temporarily stored in the stator 5. At this time, the stator 5 serves as a flywheel in a vehicle drive system including an internal combustion engine.

  For this reason, for example, when the rotating electrical machine 21 that has been operated by rotating the stator 5 is switched to operate while the stator 5 is fixed, the rotational energy stored in the stator 5 can be used, and the motor consumption Electric power can be reduced and regeneration efficiency can be improved.

  Further, in the rotating electrical machine 21 of the second embodiment, since the inverter 22 and the battery 23 are coupled to the stator 5 as shown in FIG. 3, the slip ring 8 shown in FIG. However, it is possible to supply power from the battery 23 to the coil winding 6. Therefore, the rotating electrical machine 31 can be reduced in weight and size, and the mountability to a vehicle or the like is improved.

  Next, a description will be given of a third embodiment of the stator rotatable type rotating electric machine according to the present invention. Here, members common to the above-described embodiments are assigned the same reference numerals and description thereof is omitted, and different members are newly described by adding reference numerals.

  FIG. 4 is a longitudinal sectional view showing a stator rotatable type rotating electrical machine 31 according to a third embodiment of the present invention in a cross section in a plane including a rotating shaft.

A hole 24 extending in the direction of the axis O is provided in the inverter 22 and the battery 23.
The front end 12 s of the central shaft 12 is projected outward from the stator 5. A first clutch 25 is provided between the front end 12 s and the inner peripheral surface of the hole 24.
Similarly to the brakes 7 and 19, the first clutch 25 is configured by spline fitting a plurality of ring-shaped clutch plates. The clutch plate is fitted to the center shaft 12 and the battery 23 so as to be movable in the direction of the axis O and immovable in the circumferential direction. When the central shaft 12 is coupled to the battery 23, the clutch plates are pressed by a piston mechanism (not shown) to execute the fastening. On the other hand, if not coupled, the first clutch 25 is released without performing the above-described pressing.

While releasing the first clutch 25, the central shaft 12 is disconnected from the inverter 22 and the battery 23, and rotates separately. Center shaft 12 is coupled to rotor 11, and inverter 22 and battery 23 are coupled to stator 5. Therefore, the stator 5 and the rotor 11 rotate separately. Since this is indispensable for the rotary electric machine to drive or regenerate, the first clutch 25 is normally released.
While the first clutch 25 is engaged, the central shaft 12 is connected to the inverter 22 and the battery 23, and these 12, 22, 23 rotate together. Therefore, the relative rotational speed between the stator 5 and the rotor 11 becomes zero.

A second clutch 26 is inserted into the coupling portion between the sun gear s and the output shaft 13.
Similarly to the first clutch 25, the second clutch 26 is configured by spline fitting a plurality of ring-shaped clutch plates. The clutch plate is fitted to the sun gear s and the output shaft 13 so as to be movable in the direction of the axis O and immovable in the circumferential direction. When the centering shaft 13 is coupled to the sun gear s, the clutch plates are pressed together by a piston mechanism (not shown) to perform fastening. On the other hand, if not coupled, the second clutch 26 is released without pressing.

  While the second clutch 26 is engaged, the output shaft 13 is connected to the sun gear s, and these s and 13 rotate integrally. While releasing the second clutch 26, the output shaft 13 is disconnected from the sun gear s and rotates separately. As shown in FIG. 4, the second clutch 26 is located between the outer wall of the stator 5 and the inner wall of the case 2, but may be outside the case 2.

The rotational speeds of the rotating elements s, r, and 5c constituting the planetary gear set 14 provided in the rotating electrical machine 31 are shown in an alignment chart in FIG.
In FIG. 5, the same parts as those of the lever and the rotational speed shown in the collinear diagram of FIG. That is, the rotating electrical machine 31 has the same effect as the rotating electrical machine 1 and the rotating electrical machine 21 described above, and reduces the relative rotational speed between the stator 5 and the rotor 11 even when the output shaft 13 and the sun gear s are rotating at a high speed. Thus, an increase in induced voltage can be prevented.

Furthermore, in the rotating electrical machine 31 of the third embodiment, the first clutch 25 is provided as shown in FIG.
That is, normally, the first clutch 25 is released, the drive operation and the regenerative operation of the rotating electrical machine 31 are enabled, and the rotation speeds of the rotary elements s, r, and 5c are changed to the levers α, γ, and δ shown in FIG. It is prescribed as follows.

  On the other hand, when the induced voltage is desired to be 0, the first clutch 26 is engaged, the relative rotational speed between the stator 5 and the rotor 11 is set to 0, and the rotational speeds of the rotary elements s, r, 5c are It is defined as a lever ε shown in FIG. Since the rotor 11 is coupled to the sun gear s and the stator 5 is coupled to the carrier 5c, the rotational speed of the sun gear s is equal to the rotational speed of the carrier 5c, and in FIG. The relative rotational speed is 0).

When rotation is input to the rotating electrical machine 31 from the outside (the output shaft 13 side), the regenerative operation of the rotating electrical machine 31 is not necessary if the battery 23 is fully charged. Therefore, in this embodiment, the first clutch 25 is engaged, the first brake 7 is released, the second brake 19 is released, the second clutch 26 is engaged, and the induced voltage of the coil winding 6 is reduced to zero. To do.
Furthermore, the rotation speed of the stator 5 and the rotor 11 which are integrated becomes equal to the rotation speed of the output shaft 13 (for example, the rotation speed n2 in FIG. 5), and other than the regenerative operation using the inertia moment of the stator 5 and the rotor 11. It becomes possible to store rotational energy by the means. If it adds here, the stator 5 at this time will play the role of the flywheel in the vehicle drive system provided with the internal combustion engine.

Therefore, for example, if the rotational speed of each rotating element is realized like the lever ε, and the rotational speed of the output shaft 13 is expected to decrease, the second clutch 26 is released to store the rotational energy. It becomes possible to play a role.
Thereafter, for example, when the second clutch 26 is engaged and driving of the output shaft 13 is started, the stored rotational energy can be used for driving operation, and the efficiency as a motor is improved.
Thus, the rotational energy storage means for storing rotational energy may be a controller (not shown) that controls the target torque and the target rotational speed of the rotating electrical machine 1.

  Next, FIG. 6 shows a chart in which the operation methods of the rotating electrical machines 1, 21 and 31 are classified according to the operating state.

  In this embodiment, the first brake 7, the second brake 19, the first clutch 25, and the second clutch 26 are engaged according to the absolute rotational speed of the rotor 11 during power running (drive operation) and regenerative operation. Or release.

First, the operation during power running (driving operation) will be described with reference to FIG.
When the absolute rotational speed of the rotor 11 is low, the induced voltage is low, so no problem occurs. Therefore, as shown in the item “rotor (low)” in “power running” in FIG. 6, the first brake 7 is engaged and the second brake 19 is released.
Since the first clutch 25 and the second clutch 26 are not essential, they are displayed with diagonal lines. If the first clutch 25 and the second clutch 26 are provided, these 25 and 26 are fastened.
At this time, the state of the planetary gear set 14 is the lever α in the alignment chart shown in FIG.

Returning to FIG. 6, in order to prevent the induced voltage from increasing when the absolute rotation number of the rotor 11 is high, as shown in the item “Rotor (high)” in “Powering” of FIG. 6. The first brake 7 is released, and the second brake 19 is engaged.
Since the first clutch 25 and the second clutch 26 are not essential, they are displayed with diagonal lines. If the first clutch 25 or the second clutch 26 is provided, the clutch is engaged.
At this time, the state of the planetary gear set 14 is the lever δ of the alignment chart shown in FIG.

Returning to FIG. 6, when the absolute rotational speed of the rotor 11 changes from low to high, control is performed as shown in the item “rotor (low height)” in “powering” in FIG. 6. That is, the first brake 7 and the second brake 19 are adjusted so that the engaged second brake 19 is released while the released first brake 7 is engaged.
Alternatively, when the absolute rotation speed of the rotor 11 changes from high rotation to low rotation, the first brake 7 and the second brake are engaged so as to engage the released second brake 19 while releasing the engaged first brake 7. 19 is adjusted.
Since the first clutch 25 and the second clutch 26 are not essential, they are displayed with diagonal lines. If the first clutch 25 and the second clutch 26 are provided, the clutch is kept engaged.
At this time, the planetary gear set 14 is in the state of a lever ζ in the alignment chart shown in FIG. That is, it is temporarily located between the lever α and the lever δ.

Next, the regenerative operation will be described with reference to FIG.
When the remaining amount of the battery 23 is low and when the absolute rotation number of the rotor 11 is low, the first brake 7 is engaged as shown in the item “BAT remaining amount (low)” in “Regeneration” in FIG. Then, the second brake 19 is released. Thereby, the battery 23 is charged.
Since the first clutch 25 and the second clutch 26 are not essential, they are displayed with diagonal lines. If the first clutch 25 and the second clutch 26 are provided, these 25 and 26 are fastened.
At this time, the state of the planetary gear set 14 is the lever α in the alignment chart shown in FIG.

Returning to FIG. 6, when the remaining amount of the battery 23 is medium, and when the absolute rotation number of the rotor 11 is high, the item “BAT remaining amount (medium)” in “regeneration” in FIG. As shown, the first brake 7 is released and the second brake 19 is engaged. Thereby, the relative rotational speed between the stator 5 and the rotor 11 is reduced, the induced voltage is lowered, and the battery 23 is charged.
Since the first clutch 25 and the second clutch 26 are not essential, they are displayed with diagonal lines. If the first clutch 25 or the second clutch 26 is provided, the clutch is engaged.
At this time, the state of the planetary gear set 14 is the lever δ of the alignment chart shown in FIG.

  If the first clutch 25 is provided, an operation when the remaining amount of the battery 23 is full becomes possible. That is, the first brake 7 is released, the second brake 19 is released, and the first clutch 25 is engaged as shown in the item “BAT remaining amount (full)” in “regeneration” in FIG. As a result, the state of the planetary gear set 14 is rotated integrally with the stator 5 and the rotor 11 like a lever ε in the alignment chart shown in FIG. If the rotation is integrated, the relative rotational speed between the stator 5 and the rotor 11 can be set to 0, and the induced voltage can be set to 0. If the induced voltage is 0, the battery 23 is not charged.

  Further, if the second clutch 26 is provided, the following effects can be obtained.

First, rotational energy can be stored as a flywheel motor.
First, while the output shaft 13 is rotated by a load side such as a drive wheel and is rotating, the first brake 7 is released, the second brake 19 is released, and the first clutch 25 is engaged. Further, the second clutch 26 is engaged. In the state of the lever ε in FIG. 7, the stator 5, the rotor 11, and the planetary gear set 14 are rotated.
Next, when it is predicted that the rotation speed of the output shaft 13 will decrease, such as when the output shaft 13 stops, the second clutch 26 is released in advance, and the stator 5, the rotor 11, and the planetary gear set 14 are connected. Leave inertial rotation. Even when the output shaft 13 stops, the state of the lever ε in FIG. 7 is maintained.

  In particular, when the remaining amount of the battery 23 is fully charged, the rotational energy can be stored by a method other than the regenerative operation. Therefore, it is possible to improve energy efficiency when all the operating states of the rotating electrical machine are comprehensively focused.

Second, regenerative operation is possible while the output shaft 13 is stopped.
First, as shown by the item “BAT remaining amount (full)” in FIG. 6, the second clutch 26 is released while the output shaft 13 is stopped, and the rotational energy is stored as described above (FIG. 7). Lever ε).
Next, when the rotating electric machine 31 is regeneratively operated, as shown in the item “utilization of flywheel when the output shaft is stopped” in FIG. 6, the first brake 7 is released and the second brake 19 is released, The first clutch 25 is switched to release, and relative rotation between the stator 5 and the rotor 11 is allowed. The second clutch 26 is engaged, and the sun gear s is fixed so as not to rotate (the lever η in FIG. 7). Or it is set as low speed rotation (lever (theta) of FIG. 7).
Since the relative rotational speed of the rotor 11 is obtained in this manner, regeneration is possible even when the rotational speed of the output shaft 13 is stopped or low, and the battery 23 can be charged.

Thirdly, the start of operation of the rotating electrical machine 31 can be assisted as a flywheel motor.
First, as shown by the item “BAT remaining amount (full)” in FIG. 6, the second clutch 26 is released while the output shaft 13 is stopped, and the rotational energy is stored as described above (FIG. 7). Lever ε).
Next, when starting the rotating electrical machine 31 being utilized as the above-described flywheel motor, the first brake 7 is released as shown in the item “utilize flywheel” in “START” in FIG. 6. The second brake 19 is left released.
Then, the first clutch 25 that has been engaged is released, and the released second clutch 26 is gradually engaged. Thereby, the starting of the output shaft 13 can be assisted using the rotational energy stored in the stator 5 and the rotor 11.

By the way, the rotary electric machines 1, 21, and 31 of the first to third embodiments described above include a stator 5 rotatably supported by the case 2 and a first brake 7 that fixes the stator 5 to the case 2.
A planetary gear set 14 having at least three rotating elements r, s, and c is provided as a differential device, and one of the rotating elements c and the stator 5 are drivingly connected, and the other rotating element is connected. s and the rotor 11 are drivingly coupled,
The relative rotational speed between the stator 5 and the rotor 11 can be reduced, and the induced voltage can be reduced.
Moreover, not only can the induced voltage be reduced, it is possible to achieve both suppression of the induced voltage and operation of the rotating electrical machine, and operation can be performed with the output shaft rotation speed kept in the high rotation range.
Therefore, energy can be regenerated while suppressing the induced voltage even while traveling on a downhill road or traveling at a reduced speed, and the battery can be charged. Further, energy can be regenerated while suppressing the induced voltage even when traveling on a downhill road or traveling at a reduced speed, and the battery can be charged.

Specifically, when the absolute rotation speed of the rotor 11 is a high rotation n2 that is equal to or greater than a predetermined value, the first brake 7 is released, and the remaining one rotation element r in the planetary gear set 14 is transferred to FIG. It is possible to reduce the relative rotational speed between the stator 5 and the rotor 11 to n3 by controlling the rotational speed as in the lever δ shown in FIG.
For this reason, in this embodiment, it is possible to operate with the output shaft rotation speed in a high rotation region, and there is a beneficial effect that the rotating electrical machine can be driven or regenerated while suppressing the induced voltage. can get.

More specifically, a second brake 19 for fixing the ring gear r is provided, and when the rotational speed of the rotor 11 is a high rotation of a predetermined value or more, the second brake 19 is fastened to fix the ring gear r. From the configuration
As shown in the collinear diagram of FIGS. 2 and 4, even when the absolute rotation speed of the rotor 11 is high rotation n2, the relative rotation speed between the stator 5 and the rotor 11 can be set to a small / medium rotation n3. .

In the rotating electrical machine 31, the first clutch 25 for connecting and disconnecting the drive coupling between the rotor 11 and the stator 5 is provided, and when the induced voltage is set to 0, the first brake 7 and the second brake 19 are released to release the first clutch. Since it was configured to fasten 25,
As indicated by a lever ε in the collinear diagram of FIG. 5, the rotational speed of the carrier 5 c coupled to the stator 5 and the rotational speed of the sun gear s coupled to the rotor 11 can be matched, and the induced voltage is set to zero. be able to.
Therefore, when the charging state of the battery 23 is full, the charging can be stopped while allowing the output shaft 13 to rotate.

The rotating electrical machine 31 is provided with a second clutch 26 that connects and disconnects the drive coupling between the rotor 11 and the output shaft 13, and normally the second clutch 26 is fastened. When the output shaft 13 is rotating, the first brake 7 and the second brake 19 are released as appropriate and the first clutch 25 is engaged.
Then, when it is predicted that the output shaft 13 is lowered from the rotation state to substantially zero, the second clutch 26 is released in advance.
When the rotating electrical machine is not being driven, when rotation is input from the load side to the output shaft 13 side, the stator 5 and the rotor 11 can be rotated together with the rotating electrical machine 31. After that, when the rotational input from the load side stops, the second clutch 26 can be released and rotational energy can be stored in the stator 5 and the rotor 11.
Therefore, the rotating electrical machine 31 can be used as a flywheel motor.

Then, as shown in the chart of FIG. 6, at the start of the driving operation (at the time of starting the motor), the second clutch 26 is gradually engaged,
It is possible to easily start the driving operation using the rotational energy stored in the rotating electrical machine 31, and it is possible to contribute to the reduction of motor power consumption.

Further, in the rotating electrical machines 1, 21, 31 described above, it is possible to suppress or stop the generation of the induced voltage in an emergency. That is, abnormality detection for detecting abnormalities in the rotating electrical machines 1, 21 and 31, abnormalities in the battery 23, and abnormalities in the electrical system such as the slip ring 8, the inverter 22 and the high-voltage harness that electrically connects the rotating electrical machines and the battery. Means (not shown) are provided.
When the above abnormality, for example, an abnormality in which the induced voltage exceeds the withstand voltage performance of the inverter 22 is detected, all the brakes 7 and 19 included in the rotating electrical machines 1, 21 and 31 are released.
Thereby, generation | occurrence | production of an induced voltage can be suppressed thru | or interrupted, and the electric system including the rotary electric machines 1, 21, 31, the battery 23, and the inverter 22 can be protected.

In particular, if the first clutch 25 is provided as in the rotating electrical machine 31, when an abnormality detection means (not shown) detects an abnormality, all the brakes 7 and 19 are released and the first clutch 25 is disengaged. Conclude.
Thereby, since the rotor 11 and the stator 5 do not rotate relative to each other, the generation of an induced voltage can be eliminated and the energization can be interrupted.

Further, in the rotating electrical machines 21 and 31 described above, since the battery 23 having a large mass and further the inverter 22 are coupled to the stator 5 as a mass body,
It is not necessary to provide the slip ring 8 or the high-voltage harness in the rotating electrical machine, and the rotating electrical machine can be reduced in size.

Especially in the rotating electrical machine 31, since it is used as a flywheel motor,
By attaching the mass body as described above, more and more rotational energy can be stored.
In addition to attaching the mass body directly to the stator 5, although not shown in the drawing, substantially the same effect can be obtained even if the mass body is drivingly coupled to the sun gear s that is drivingly coupled to the stator 5.

  The above description is merely an example of the present invention, and the present invention can be variously modified without departing from the spirit of the present invention. For example, a double pinion type planetary gear mechanism or a Ravigneaux type planetary gear mechanism may be used as the planetary gear set 14. In addition to fixing the ring gear r of the planetary gear set 14, the rotational speed of the ring gear r and the carrier c is controlled, so that the relative rotational speed of the stator 5 and the rotor 11 (the relative rotational speed of the carrier c and the sun gear s) (Equal) may be controlled.

1 is a longitudinal sectional view showing a stator rotatable type rotating electrical machine according to a first embodiment of the present invention. It is a collinear diagram which shows the rotation speed of the planetary gear set with which the stator rotation type rotary electric machine of the Example comprises. It is a longitudinal cross-sectional view which shows the stator rotary type rotary electric machine which becomes 2nd Example of this invention. It is a longitudinal cross-sectional view which shows the stator rotary type rotary electric machine which becomes 3rd Example of this invention. It is a collinear diagram which shows the rotation speed of the planetary gear set with which the stator rotation type rotary electric machine of the Example comprises. It is a chart which classify | categorizes and shows operation of the brake and clutch which the stator rotation type rotary electric machine of the Example comprises. It is a collinear diagram which shows the rotation speed of the planetary gear set with which the stator rotation type rotary electric machine of the Example comprises, for every driving | running state.

Explanation of symbols

2 Rotating electrical machine case 5 Stator 6 Coil winding 7 First brake 8 Slip ring 11 Rotor 12 Rotor center shaft 13 Output shaft 14 Planetary gear set 19 Second brake 22 Current control circuit for DC / AC conversion (inverter)
23 DC battery 24 Through hole 25 1st clutch 26 2nd clutch

Claims (10)

In a stator rotatable type rotating electrical machine comprising a stator rotatably supported by a case and a first brake device for fixing the stator to the case,
A differential having at least three rotating elements is provided, of which one rotating element and the stator are drivingly coupled, and the other one rotating element and the rotor of the rotating electrical machine are drivingly coupled. A stator rotating type rotating electrical machine characterized by the above. In the stator rotatable type rotating electrical machine according to claim 1,
The differential is a planetary gear mechanism,
When the rotational speed of the rotor is equal to or greater than a predetermined value, the first brake device is released, the rotational speed of the remaining one rotating element of the differential device is controlled, and the relative rotational speed between the stator and the rotor A stator rotating type rotating electrical machine, characterized in that it is provided with a relative rotational speed control means for reducing the above. The stator rotatable type rotating electrical machine according to claim 2,
The one rotating element is a carrier of a planetary gear mechanism, the other one rotating element is a sun gear of the planetary gear mechanism, and the remaining one rotating element is a ring gear of the planetary gear mechanism,
Providing a second brake device for fixing the ring gear;
When the rotational speed of the rotor is equal to or greater than a predetermined value, the relative rotational speed control means is configured to fasten the second brake device and fix the ring gear. The stator rotatable type rotating electrical machine according to claim 3,
A first clutch device for connecting and disconnecting the drive coupling between the rotor and the stator is provided;
When the induced voltage is set to 0, the stator rotating type rotating electrical machine is configured such that the first brake device and the second brake device are released and the first clutch device is engaged. The stator rotatable type rotating electrical machine according to claim 4,
A second clutch device for connecting and disconnecting the drive coupling between the rotor and the output shaft;
In a rotating state of the output shaft when the rotating electrical machine is not driven, the first brake device and the second brake device are released and the first clutch device and the second clutch device are engaged, so that the rotational speed of the output shaft decreases. And a rotational energy storage means for releasing the second clutch device when it is predicted that the stator rotating type rotating electrical machine is provided. In the stator rotatable type rotating electrical machine according to claim 5,
When the rotating electrical machine starts driving, the rotational energy storage means gradually engages the second clutch device, and the stator rotatable rotating electrical machine. The stator rotatable type rotating electrical machine according to any one of claims 3 to 6,
An abnormality detection means for detecting an abnormality of the rotating electrical machine, the battery, and an electrical system that electrically connects the rotating electrical machine and the battery;
When the abnormality is detected, the stator rotating type rotating electrical machine is configured to release all the brake devices. The stator rotatable type rotating electric machine according to claim 7,
When the abnormality is detected, the stator rotating type rotating electrical machine is characterized in that the first clutch device is engaged. In the stator rotating type rotating electrical machine according to any one of claims 1 to 8,
A stator rotating type rotating electric machine characterized in that a mass body is coupled to at least one of the stator or the one rotating element drivingly coupled to the stator. The stator rotatable type rotating electrical machine according to claim 9,
The mass body includes at least one of a battery that transmits and receives electric power to and from the rotating electrical machine, and an inverter that connects the rotating electrical machine and the battery.

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