JP6871077B2 - Motor generator device - Google Patents

Description

The present invention relates to a motor generator device.

As a motor generator device including a motor and a generator, there is one in which the motor and the generator are arranged coaxially and axially (see, for example, Patent Document 1). The motor or generator includes a stator core and a stator coil mounted on the stator core. The stator coil includes a coil end portion that projects from the end face of the stator core. In the motor generator device described in Patent Document 1, the stators are arranged so as to face each other in the axial direction, and the coil end portions protrude from the stator core toward the stator side which faces each other in the axial direction.

Japanese Unexamined Patent Publication No. 2014-180169

However, in the motor generator device described above, since the coil end portions of the motor and the generator overlap each other when viewed from the axial direction, at least a pair of coil end portions are provided between the stator cores. Therefore, in the conventional motor generator device, there is room for improvement in that the distance between the stator cores is narrowed to reduce the axial dimension.

Therefore, the present invention provides a motor generator device that is miniaturized in the axial direction.

The motor generator device of the present invention (for example, the motor generator device 1 in the embodiment) has a first rotor (for example, the first rotor 12 in the embodiment) that rotates around a predetermined axis (for example, the axis C in the embodiment), and It faces a motor (for example, the motor 10 in the embodiment) having a first stator (for example, the first stator 15 in the embodiment) surrounding the first rotor coaxially with the first rotor and in the axial direction of the predetermined axis. A generator (eg, the generator 20 in the embodiment) having a second rotor (eg, the second rotor 22 in the embodiment) and a second stator (eg, the second stator 25 in the embodiment) surrounding the second rotor. The first stator is attached to the first stator core (for example, the first stator core 16 in the embodiment) and the first stator core, which are cylindrically opposed to the first rotor in the radial direction. First stator coil having a first coil end portion (for example, a first opposing side coil end portion 17a in the embodiment) protruding from the end surface (for example, the opposite side end surface 16a in the embodiment) toward the generator side in the axial direction. (For example, the first stator coil 17 in the embodiment), and the second stator is a tubular second stator core (for example, the second stator core 26 in the embodiment) that faces the second rotor in the radial direction. A second coil end portion (for example, the first in the embodiment) that is mounted on the second stator core and projects from the end surface of the second stator core (for example, the opposite end surface 26a in the embodiment) toward the motor side in the axial direction. A second stator coil (for example, the second stator coil 27 in the embodiment) having the two opposing coil end portions 27a) is provided, and either one of the first coil end portion and the second coil end portion is provided. The coil end portion (for example, the second facing side coil end portion 27a in the embodiment) is located radially inside the other coil end portion (for example, the first facing side coil end portion 17a in the embodiment). said first coil end portion and the second coil end portion, Ri heavy Do each other when viewed from the radial direction, the first coil end portion and the second partition wall partitions the coil end section (e.g., the partition in the embodiment The wall 40) and a refrigerant supply unit for supplying the refrigerant (for example, the refrigerant flow path 32 in the embodiment) are further provided. The cut wall communicates the space on the side of the first coil end with respect to the partition wall and the space on the side of the second coil end, and the communication portion through which the refrigerant supplied from the refrigerant supply unit passes (for example,). , The communication portion 41) in the embodiment is formed .

According to the present invention, since the first coil end portion and the second coil end portion overlap each other when viewed from the radial direction, the first coil end portion and the second coil end portion do not overlap each other when viewed from the radial direction. The axial distance between the first stator core and the second stator core can be narrowed as compared with the technical configuration. Therefore, the motor and the generator can be arranged closer to each other in the axial direction as compared with the conventional technique. Therefore, it is possible to provide a motor generator device that is miniaturized in the axial direction.

In the motor generator device, the predetermined axis extends along one horizontal direction, and the refrigerant supply unit is provided above the first coil end portion and the second coil end portion, and the other you supply the refrigerant to the coil end portion, it is desirable.

According to the present invention, the refrigerant is supplied from above to the other coil end portion of the first coil end portion and the second coil end portion, which is located outside the one coil end portion in the radial direction. The refrigerant dripping from the other coil end portion can be supplied to one coil end portion. As a result, the refrigerant can be supplied to both the first coil end portion and the second coil end portion, so that the first stator coil and the second stator coil can be efficiently cooled.

In the motor generator device, one rotary electric machine (for example, a rotary electric machine) including the motor and a housing (for example, a housing 30 in the embodiment) for accommodating the motor and the coil end portion of the motor and the generator. The generator 20) in the embodiment is formed to be smaller in the radial direction than the other rotary electric machine (for example, the motor 10 in the embodiment), and the housing is rotated in the axial direction from the other rotary electric machine side. It is desirable that it tapers toward the electric side.

According to the present invention, a large space can be provided around the housing as compared with a configuration in which the radial dimension of the housing is substantially constant in the axial direction. As a result, the layout of the equipment around the motor generator device can be improved, and the extension of the motor generator device into the vehicle interior via the dashboard can be suppressed.

In the motor generator device, the inner bottom surface of the housing (for example, the bottom surface 31 in the embodiment) is formed in the lower part of the inner surface of the housing, and the one rotary electric machine side to the other rotary electric machine in the axial direction. It is desirable that it slopes downward toward the side.

According to the present invention, since the refrigerant flows along the bottom surface by gravity in the lower part inside the housing, the retention of the refrigerant in the lower part inside the housing can be suppressed. Therefore, the refrigerant can be reliably circulated inside the housing, and the motor generator device can be efficiently cooled.

In the above motor generator device, it is desirable that the one coil end portion is the second coil end portion.

According to the present invention, since the first coil end portion is located outside the second coil end portion in the radial direction, the first stator of the motor becomes larger in the radial direction than the second stator of the generator. Thereby, the characteristics of the motor can be improved as compared with the configuration in which the first stator of the motor is smaller in the radial direction than the second stator of the generator. Therefore, it is possible to provide a motor generator device having excellent motor characteristics.

According to the present invention, it is possible to provide a motor generator device that is miniaturized in the axial direction.

It is sectional drawing which looked at the motor generator device of embodiment from the horizontal direction. It is a top view which shows the vehicle which includes the motor generator device which concerns on embodiment. It is a figure explaining the cooling structure of the motor generator device of embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same reference numerals are given to configurations having the same or similar functions. Then, the duplicate description of those configurations may be omitted.

FIG. 1 is a schematic cross-sectional view of the motor generator device of the embodiment as viewed from the horizontal direction.
As shown in FIG. 1, the motor generator device 1 includes a motor 10, a generator 20, a housing 30, and a partition wall 40. The motor 10 and the generator 20 are arranged inside the housing 30 so that the rotation centers coincide with each other and face each other in the axial direction of the axis C (predetermined axis) of the rotation center. The axis C extends along one horizontal direction. In the following description, the axial direction of the axis C is simply referred to as the axial direction, the direction orthogonal to the axis C and extending radially from the axis C is referred to as the radial direction, and the circumferential direction around the axis C is simply referred to as the circumferential direction.

The motor 10 is, for example, a segment coil type rotary electric machine. The motor 10 includes a first shaft 11, a first rotor 12, and a first stator 15.
The first shaft 11 is formed in a cylindrical shape. The first shaft 11 is supported by the bearing 51 with respect to the housing 30, and is supported by the bearing 52 with respect to the partition wall 40. The first shaft 11 is rotatably provided around the axis C with respect to the housing 30.

The first rotor 12 includes a first rotor core 13 and a plurality of first rotor magnets 14. The first rotor core 13 is formed in a cylindrical shape and is fitted onto the first shaft 11. Each first rotor magnet 14 is mounted on the first rotor core 13. The first rotor 12 rotates about the axis C with respect to the housing 30 together with the first shaft 11.

The first stator 15 is relatively fixed to the housing 30. The first stator 15 surrounds the first rotor 12. The first stator 15 includes a first stator core 16 and a first stator coil 17. The first stator core 16 is formed in a tubular shape so as to face the first rotor 12 in the radial direction. The first stator core 16 includes an end surface 16a on the opposite side facing the generator 20 in the axial direction and an end surface 16b on the opposite side facing the end surface 16a on the opposite side in the axial direction. The first stator core 16 is provided with teeth 16c and slots (not shown) alternately along the circumferential direction.

The first stator coil 17 is mounted on the first stator core 16. The first stator coil 17 is formed from a first opposing coil end portion 17a (first coil end portion) projecting axially from the opposite end surface 16a of the first stator core 16 and an opposite end surface 16b of the first stator core 16. It includes a first anti-opposite coil end portion 17b that projects in the axial direction.

The generator 20 is, for example, a segment coil type rotary electric machine. The generator 20 is formed to be smaller in the radial direction than the motor 10. The generator 20 includes a second shaft 21, a second rotor 22, and a second stator 25.
The second shaft 21 is inserted inside the first shaft 11 and is supported by a bearing 53 with respect to the partition wall 40. The second shaft 21 is rotatably provided around the axis C with respect to the housing 30.

The second rotor 22 is coaxial with the first rotor 12 and faces the first rotor 12 in the axial direction. The second rotor 22 includes a second rotor core 23 and a plurality of second rotor magnets 24. The second rotor core 23 is formed in a cylindrical shape and is fitted onto the second shaft 21. The outer diameter of the second rotor core 23 is smaller than the outer diameter of the first rotor core 13. Each second rotor magnet 24 is mounted on the second rotor core 23. The second rotor 22, together with the second shaft 21, rotates about the axis C with respect to the housing 30.

The second stator 25 is relatively fixed to the housing 30. The second stator 25 surrounds the second rotor 22. The second stator 25 includes a second stator core 26 and a second stator coil 27. The second stator core 26 is formed in a tubular shape so as to face the second rotor 22 in the radial direction. The second stator core 26 includes an opposite end surface 26a facing the motor 10 in the axial direction and an opposite end surface 26b facing the opposite side opposite to the opposite end surface 26a in the axial direction. The second stator core 26 is provided with teeth 26c and slots (not shown) alternately along the circumferential direction. The teeth 26c and slots of the second stator core 26 are formed radially inside the teeth 16c and slots of the first stator core 16.

The second stator coil 27 is mounted on the second stator core 26. The second stator coil 27 is arranged inside the first stator coil 17 in the radial direction. The second stator coil 27 is formed from a second opposing coil end portion 27a (second coil end portion) projecting axially from the opposite end surface 26a of the second stator core 26 and an opposite end surface 26b of the second stator core 26. It includes a second anti-opposite coil end portion 27b that projects in the axial direction. The second counter-side coil end portion 27a and the second anti-opposite side coil end portion 27b are located inside the first counter-side coil end portion 17a and the first anti-opposite side coil end portion 17b in the radial direction. The first facing side coil end portion 17a and the second facing side coil end portion 27a overlap each other when viewed from the radial direction.

The housing 30 houses the motor 10, the generator 20, and the like. Further, a refrigerant (for example, automatic transmission fluid) is introduced into the housing 30 for cooling and lubricating the motor 10, the generator 20, the bearings 51, 52, 53 and the like. The housing 30 has a shape corresponding to the motor 10 and the generator 20. That is, since the unit composed of the motor 10 and the generator 20 has a smaller radial dimension from the motor 10 side to the generator 20 side in the axial direction, the housing 30 is axially smaller from the motor 10 side to the generator 20 side. It tapers toward. Further, the inner surface of the housing 30 extends outward in the radial direction from the generator 20 side toward the motor 10 side in the axial direction. As a result, the bottom surface 31 inside the housing 30 is formed in the lower part of the inner surface of the housing 30, and is inclined downward from the generator 20 side toward the motor 10 side in the axial direction.

A refrigerant flow path 32 (refrigerant supply section) through which the refrigerant flows is formed in the upper portion of the housing 30, that is, a portion of the housing 30 located above the motor 10 and the generator 20. Refrigerant is supplied to the refrigerant flow path 32 by a refrigerant pump or the like (not shown). The refrigerant flow path 32 is open to each of the upper portion of the first anti-opposite side coil end portion 17b, the upper portion of the first anti-opposite side coil end portion 17a, and the upper portion of the second anti-opposite side coil end portion 27b. As a result, the refrigerant flow path 32 drops and supplies the refrigerant to the first anti-opposite side coil end portion 17b, the first anti-opposite side coil end portion 17a, and the second anti-opposite side coil end portion 27b.

The partition wall 40 is erected from the inner surface of the housing 30 toward the inside in the radial direction. The partition wall 40 is provided between the first rotor 12 and the first stator 15 and the second rotor 22 and the second stator 25. The partition wall 40 partitions the first facing side coil end portion 17a and the second facing side coil end portion 27a. A communication portion 41 penetrating in the radial direction is formed at a portion of the partition wall 40 sandwiched in the radial direction by the first facing side coil end portion 17a and the second facing side coil end portion 27a. The communication portion 41 communicates the space on the first facing side coil end portion 17a side with respect to the partition wall 40 and the space on the second facing side coil end portion 27a side. One communication portion 41 may be formed, or a plurality of communication portions 41 may be formed side by side in the circumferential direction. Further, a shaft insertion hole 42 provided coaxially with the axis C is formed in the center of the partition wall 40. The first shaft 11 and the second shaft 21 are inserted into the shaft insertion hole 42, and the first shaft 11 and the second shaft 21 are supported via bearings 52 and 53. In addition to the communication portion 41 and the shaft insertion hole 42, the partition wall 40 may be formed with, for example, a through hole for forming a flow path for the refrigerant.

Next, the vehicle 100 including the motor generator device 1 will be described.
FIG. 2 is a schematic plan view showing a vehicle including the motor generator device according to the embodiment.
As shown in FIG. 2, the vehicle 100 includes an engine 102 and a motor generator device 1 arranged in the engine room 101. The engine 102 is arranged in a state in which the axis of the crankshaft is along the vehicle front-rear direction, that is, in a so-called vertical installation state. The motor generator device 1 is arranged adjacent to the rear of the vehicle with respect to the engine 102. The motor generator device 1 is arranged so that the axis C (see FIG. 1) is along the vehicle front-rear direction and the generator 20 is located behind the vehicle with respect to the motor 10. The motor generator device 1 is arranged so as to project into the vehicle interior 104 via the dashboard 103.

Next, the cooling structure of the motor 10 and the generator 20 will be described.
FIG. 3 is a diagram illustrating a cooling structure of the motor generator device of the embodiment. The arrows in FIG. 3 indicate the flow of the refrigerant.
As shown in FIG. 3, the refrigerant supplied from the refrigerant flow path 32 to the first facing coil end portion 17a flows in the circumferential direction along the first facing side coil end portion 17a, and a part of the refrigerant flows in the circumferential direction due to gravity. It hangs down. The refrigerant dripping from the first facing coil end portion 17a is supplied to the second facing coil end portion 27a located below the first facing side coil end portion 17a through the communication portion 41 of the partition wall 40. To. The refrigerant supplied to the second facing coil end portion 27a flows in the circumferential direction along the second facing side coil end portion 27a. Further, the refrigerant supplied from the refrigerant flow path 32 to the first anti-opposite side coil end portion 17b and the second anti-opposite side coil end portion 27b is also the same as the refrigerant supplied to the first anti-opposite side coil end portion 17a. It flows in the circumferential direction.

The refrigerant that has moved from the upper part to the lower part of each coil end portion 17a, 17b, 27a, 27b along the coil end portions 17a, 17b, 27a, 27b falls to the bottom surface 31 inside the housing 30. Since the bottom surface 31 inside the housing 30 is inclined downward with respect to the axial direction, the refrigerant that has fallen on the bottom surface 31 flows along the axial direction and is pumped up again by a refrigerant pump (not shown). In this way, the refrigerant circulates inside the housing 30 to cool the coil end portions 17a, 17b, 27a, 27b.

As described above, according to the motor generator device 1 of the present embodiment, the first facing coil end portion 17a and the second facing side coil end portion 27a overlap each other when viewed from the radial direction, so that the first facing side coil The axial distance between the first stator core 16 and the second stator core 26 can be narrowed as compared with the configuration of the prior art in which the end portion and the second opposing coil end portion do not overlap each other when viewed from the radial direction. Therefore, the motor 10 and the generator 20 can be arranged closer to each other in the axial direction as compared with the conventional technique. Therefore, it is possible to provide the motor generator device 1 which is miniaturized in the axial direction.

Further, the motor generator device 1 is provided above the first facing side coil end portion 17a and the second facing side coil end portion 27a, and is located outside the second facing side coil end portion 27a in the radial direction. A refrigerant flow path 32 for supplying a refrigerant to the opposite coil end portion 17a is provided. As a result, the refrigerant is supplied to the first facing coil end portion 17a from above, so that the refrigerant dripping from the first facing side coil end portion 17a can be supplied to the second facing side coil end portion 27a. As a result, the refrigerant can be supplied to both the first facing side coil end portion 17a and the second facing side coil end portion 27a, so that the first stator coil 17 and the second stator coil 27 can be efficiently cooled.

Further, the motor generator device 1 includes a partition wall 40 for partitioning the first facing side coil end portion 17a and the second facing side coil end portion 27a, and the partition wall 40 has a first facing side coil end with respect to the partition wall 40. A communication portion 41 is formed that communicates the space on the portion 17a side with the space on the second opposing side coil end portion 27a side. As a result, even if the partition wall 40 is provided between the first facing side coil end portion 17a and the second facing side coil end portion 27a, it hangs down from the first facing side coil end portion 17a through the communication portion 41. The refrigerant can be supplied to the second opposing coil end portion 27a. Therefore, since the refrigerant can be supplied to both the first facing side coil end portion 17a and the second facing side coil end portion 27a, the first stator coil 17 and the second stator coil 27 can be efficiently cooled.

Further, since the generator 20 is formed smaller in the radial direction than the motor 10 and the housing 30 is tapered from the motor 10 side toward the generator 20 side in the axial direction, the radial dimension of the housing is axially oriented. A large space can be provided around the housing 30 as compared with the configuration in which the housing 30 is substantially constant. Thereby, for example, as shown in FIG. 1, a device such as a PCU (Power Control Unit) 105 can be arranged in a new space created by forming the housing 30 so as to be tapered. Therefore, the device layout around the motor generator device 1 can be improved. Further, it is possible to suppress the protrusion of the motor generator device 1 into the vehicle interior 104 via the dashboard 103.

Further, the bottom surface 31 inside the housing 30 is inclined downward from the generator 20 side toward the motor 10 side in the axial direction. Therefore, since the refrigerant flows along the bottom surface 31 by gravity in the lower part inside the housing 30, it is possible to suppress the retention of the refrigerant in the lower part inside the housing 30. Therefore, the refrigerant can be reliably circulated inside the housing 30, and the motor generator device 1 can be efficiently cooled.

Further, since the first opposing coil end portion 17a of the motor 10 is located outside the second opposing coil end portion 27a of the generator 20 in the radial direction, the first stator 15 of the motor 10 is the generator. It is larger in the radial direction than the second stator 25 of 20. Thereby, the characteristics of the motor 10 can be improved as compared with the configuration in which the first stator 15 of the motor 10 is smaller in the radial direction than the second stator 25 of the generator 20. Therefore, it is possible to provide the motor generator device 1 having excellent motor characteristics.

The present invention is not limited to the above-described embodiment described with reference to the drawings, and various modifications can be considered within the technical scope thereof.
For example, in the above embodiment, the segment coil type rotary electric machine has been described as an example of the motor 10 and the generator 20, but the present invention is not limited to this, and has other winding structures such as centralized winding and distributed winding. It may be a rotary electric machine.

Further, in the above embodiment, the partition wall 40 is provided inside the housing 30, but the partition wall 40 may not be provided. As a result, the refrigerant dripping from the first facing coil end portion 17a is directly supplied to the second facing coil end portion 27a located below the first facing side coil end portion 17a.

Further, in the above embodiment, the second facing side coil end portion 27a is located inside the first facing side coil end portion 17a in the radial direction, but the present invention is not limited to this. That is, the first facing coil end portion may be located inside the second opposing coil end portion in the radial direction, and the second stator of the generator may be formed larger in the radial direction than the first stator of the motor. ..

In addition, it is possible to replace the components in the above-described embodiment with well-known components as appropriate without departing from the spirit of the present invention.

1 ... Motor generator device 10 ... Motor (the other rotary electric machine) 12 ... 1st rotor 15 ... 1st stator 16 ... 1st stator core 16a ... Opposing side end face (end face) 17 ... 1st stator coil 17a ... 1st opposing side coil End part (the other coil end part) 20 ... Generator (one rotary electric machine) 22 ... Second rotor 25 ... Second stator 26 ... Second stator core 26a ... Opposing side end face (end face) 27 ... Second stator coil 27a ... Second 2 Opposite side coil end part (one coil end part) 30 ... Housing 31 ... Bottom surface 32 ... Refrigerator flow path (Fluent supply part) 40 ... Partition wall 41 ... Communication part C ... Axis (predetermined axis)

Claims (5)

A motor having a first rotor that rotates around a predetermined axis and a first stator that surrounds the first rotor, and
A generator having a second rotor coaxial with the first rotor and facing the predetermined axis in the axial direction, and a second stator surrounding the second rotor.
With
The first stator is
A tubular first stator core that is radially opposed to the first rotor,
A first stator coil mounted on the first stator core and having a first coil end portion protruding from the end surface of the first stator core toward the generator side in the axial direction.
With
The second stator is
A tubular second stator core that is radially opposed to the second rotor,
A second stator coil mounted on the second stator core and having a second coil end portion protruding from the end surface of the second stator core toward the motor side in the axial direction.
With
The coil end portion of either the first coil end portion or the second coil end portion is located radially inside the other coil end portion.
Said first coil end portion and the second coil end portion, Ri heavy Do each other when viewed from the radial direction,
A partition wall that separates the first coil end portion and the second coil end portion,
Further equipped with a refrigerant supply unit that supplies refrigerant,
The partition wall has a communication portion that communicates the space on the side of the first coil end with respect to the partition wall and the space on the side of the second coil end, and allows the refrigerant supplied from the refrigerant supply to pass through. Formed,
A motor generator device characterized by that. The predetermined axis extends along one horizontal direction and extends.
The coolant supply unit, the first is provided above the coil end portion and the second coil end section, supply the refrigerant to the coil end portion of the other,
The motor generator device according to claim 1. It comprises a housing for accommodating the motor and the generator.
One of the motor and the generator having the coil end portion of one of them is formed to be smaller in the radial direction than the other rotary electric machine.
The housing is tapered from the other rotary electric machine side toward the one rotary electric machine side in the axial direction.
The motor generator device according to claim 1 or 2. The bottom surface inside the housing is formed in the lower part of the inner surface of the housing, and is inclined downward from the one rotating electric machine side toward the other rotating electric machine side in the axial direction.
The motor generator device according to claim 3. The one coil end portion is the second coil end portion.
The motor generator device according to any one of claims 1 to 4.

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