JP5093582B2 - Segment type stator, rotating electric machine and driving device - Google Patents

Description

  The present invention belongs to the technical field of rotating electrical machines such as electric motors and generators in which segment conductors are used for stator coils, and also belongs to the technical field of driving devices including such rotating electrical machines as components. This drive device is suitable for use in a vehicle (for example, a hybrid car) that uses both an engine and an electric motor as power.

  As the segment conductor, a conductor made of a conductor wire having a substantially rectangular cross-section, and having a pair of straight portions that are substantially parallel to each other and a turn portion that connects one end of these straight portions to each other is widely known. As shown in FIG. 3 and FIG. 5 of Patent Document 1, the turn portion of the segment conductor has a pair of oblique portions obliquely with a predetermined angle with respect to the pair of linear portions, and the outer shape of the turn portion is approximately. It is usually in the shape of “he” or mountain.

  As a result, in the segment type stator in which the straight portions of these segment conductors are accommodated in the slots of the stator core, as shown in the lower half of FIG. Projecting to form a coil end. Of course, a rotating electrical machine having a segment type stator requires a frame having an axial dimension sufficient to accommodate the protruding coil end.

Moreover, as a drive device for hybrid cars, as disclosed in Patent Documents 2 to 4, a pair of rotating electric machines are often arranged coaxially and built therein. And many of these rotary electric machines have a segment type stator.
Japanese Patent No. 3438570 (particularly FIGS. 3 and 5) Japanese Patent Laid-Open No. 2004-343845 Japanese Patent Laid-Open No. 2004-330847 JP 2006-262553 A

  However, as described above, when the turn part of each segment conductor is composed of a pair of skew parts, and the outer shape of the turn part is generally mountain-shaped, the end part on the turn part side of both ends of the segment coil is in the axial direction. The protruding dimensions are inevitably increased. Here, this dimension is referred to as the “projection height” of the coil end portion on the turn portion side in this specification.

  Of course, the axial dimension of the segment-type stator inevitably increases as the protruding height of the coil end on either side increases. Then, the axial dimension of the frame that accommodates the segment type stator is inevitably large, and thus the axial dimension of the rotating electrical machine having the segment type stator is also large. It is inevitable.

  Here, the “axial direction” refers to a direction along the axis (center line) of the stator or the rotating electrical machine including the stator or a direction parallel to the axis, and a direction toward the axis (centripetal). Direction).

  In many cases, a drive device mounted on a hybrid car or the like incorporates a pair of rotating electric machines that are coaxially arranged opposite to each other or facing each other. If these rotating electric machines have a segment type stator, if the projecting height of the coil end can be reduced even on one side, the drive device can be reduced in size and weight accordingly. There are many cases where it can be done.

  Therefore, the present invention is to solve the problem of reducing the protruding height at one coil end of the segment type stator and providing a segment conductor as a part to be used for assembling such a stator. And Another object of the present invention is to reduce the axial dimension of a rotating electrical machine having a segment type stator and to reduce the size and weight of the rotating electrical machine. At the same time, it is an object to be solved to reduce the size and weight of a drive device having such a rotating electrical machine as a component.

  In order to solve the above problems, the inventors have invented the following means. Therefore, in this section, the configuration of each unit will be described, and the effects brought about by the configuration will be briefly described. The order numbers given to the following means correspond to the numbers of the claims described in the claims at the time of filing the present application.

[Segment conductor]
(First means)
The first means of the present invention is a segment conductor made of a conductor wire having a substantially rectangular cross-section, and having a pair of straight portions that are substantially parallel to each other and a turn portion that connects one end of these straight portions to each other. A feature of this means is that the turn portion has a plurality of flat portions that are substantially orthogonal to the straight portion and a plurality of step portions that connect the flat portions with a predetermined step in the axial direction of the straight portion. The flat portions and the step portions are alternately arranged, and the outer shape of the turn portion is formed in a pair of steps up and down.

  In this means, only the stepped portion is skewed in the direction away from the end face of the stator core, and the flat portion is substantially parallel to the end face of the stator core. Therefore, even if it is the part farthest from the end face of the stator core at the center of the turn part, the protruding height from the stator core is reduced as compared with the prior art.

  More specifically, a predetermined number of the segment conductors of this means are mounted on the stator core, and exhibit their effects in a state where a segment type coil is formed.

  Here, in order to make the explanation clear, it is assumed that the stator having the segment type coil with the coil end portion formed by the turn portion is on its axial direction along the direction of gravity. A direction away from the stator core along the axial direction is referred to as “upper” or “upper”, and conversely, a direction approaching the end face of the stator core is referred to as “lower” or “lower”.

  In this state, in the turn portion of the segment conductor of this means, between the segment conductors adjacent in the circumferential direction in which the straight portions are accommodated in the slots adjacent to each other in the stator core, the flat portions are mutually connected in the turn portion. Riding on.

  That is, it protrudes from the adjacent slot on the flat part closest to the straight part in which one of the straight parts is accommodated in the slot having the stator core (hereinafter referred to as “first flat part”). The second flat portion of the segment conductor turns. And the 2nd flat part which became one step higher from the 1st flat part of this turn part via the level | step-difference part has ridden on the 1st flat part of the turn part extended from the adjacent slot on the opposite side. In this way, in the ascending stepped portion of the turn portion, the same riding state is repeated for a predetermined number of flat portions to reach the top flat portion (referred to as the “topmost flat portion”).

  Here, the uppermost flat portion is a flat portion on the top located near the center of the turn portion, and an upward staircase portion and a downward staircase portion are formed on both sides thereof. And in the uppermost flat part, the conductor wire is shape | molded so that a shift | offset | difference may arise by the thickness of a conductor wire in the radial direction of a segment type coil. The upper surface of the uppermost flat portion corresponds to the end surface of the coil end formed by the turn portion.

  On the other hand, in the stepped portion on the downside of the turn portion of the segment conductor, the flat portions run on each other between the turn portions of the segment conductors adjacent to each other in the direction opposite to the previous upturn, and the other straight line To the flat part closest to the part. This flat portion is another first flat portion that is substantially symmetrical to the first flat portion with the uppermost flat portion interposed therebetween. That is, if the first flat portion is in the upward step-like portion, the first flat portion is in the downward step-like portion, and vice versa.

  Then, compared with the prior art currently disclosed by the above-mentioned patent document 1, the protrusion height from the stator core of the coil end part which the turn part of a segment conductor forms is reduced. That is, in the prior art, since the turn portion has a “h” shape, a triangular mountain-shaped gap is left between the turn portion of each segment conductor and the end face of the stator core. In the means, this gap is almost filled, and the protrusion height of the coil end portion is lowered accordingly.

  Therefore, according to the segment conductor of this means, the protruding height can be reduced on the turn part side of the coil end compared to the prior art, and as a result, the stator and the rotating electrical machine employing this segment conductor can be reduced in size and weight. There is an effect that can be.

(Second means)
According to a second means of the present invention, in the first means described above, the step of the flat portions adjacent to each other among the turn portions is equal to or equal to the axial cross-sectional dimension of the cross-sectional shape of the flat portions. The segment conductor is characterized as described above.

  In this means, between the segment conductors adjacent to each other in the circumferential direction, if the steps of the flat portions adjacent to each other are equal to the cross-sectional dimension, the flat portions ride on each other with almost no gap in the axial direction, and turn portion side coil end portions The protrusion height of is suppressed to a minimum. On the other hand, if the step of the flat part is larger than the cross-sectional dimension, a gap corresponding to the difference is created between the flat parts that have ridden each other. The

(Third means)
The third means of the present invention is the segment conductor according to the first means or the second means described above, further comprising an insulating film that covers at least the latter of the straight part and the turn part.

  In this means, a short circuit is unlikely to occur between the turn portions arranged without any gap (or with a minimum gap) in the axial direction.

[Segment type stator]
(Fourth means)
According to a fourth aspect of the present invention, there is provided a segment type coil in which a stator core having a plurality of slots parallel to each other and a plurality of segment conductors in which straight portions are accommodated in these slots of the stator core are connected to each other. Is a segment type stator. The feature of this means is that these segment conductors are any one of the aforementioned first to third means.

  In the segment type stator of this means, the effects already described in the section of the means can be obtained depending on which of these means is the segment conductor constituting the segment type stator.

[Rotating electric machine]
(Fifth means)
The fifth means of the present invention is a rotating electrical machine having a stator having a segment type coil and a rotor pivotally supported on the stator. The feature of this means is that the stator is a segment type stator of the fourth means.

  In the rotating electrical machine of this means, the function and effect described in the above-mentioned fourth means can be obtained. In other words, depending on whether the segment conductor constituting the coil of the segment type stator is the first to third means, the specific effects described in the section of the means can be obtained.

[Driver]
(Sixth means)
The sixth means of the present invention is a drive device having a plurality of rotating electrical machines arranged coaxially with each other, an input shaft driven by the engine, and an output means for providing a driving force to the outside. The feature of this means is that at least one of these rotating electrical machines is the rotating electrical machine of the fifth means.

  In this means, in the rotating electrical machine corresponding to the fifth means, the protruding height on the turn part side of the end portion of the stator coil is low. Therefore, according to this means, when the axial length of the drive device changes depending on the protruding height, the drive device can be reduced in size and weight.

(Seventh means)
A seventh means of the present invention is the drive device according to the sixth means, wherein all of the plurality of rotating electric machines are the rotating electric machines of the fifth means.

  In this means, since the projecting height is low at the turn end side coil end in all of the coaxially arranged rotating electrical machines, the effect of the sixth means for reducing the size and weight of the driving device is maximized. can get.

  The embodiments of each of the “segment conductor”, “segment stator”, “rotary electric machine”, and “driving device” of the present invention will be understood so that those skilled in the art can understand the present invention. The following description explains clearly and sufficiently. At the time of filing of the present invention, the inventor considers that the following embodiment or its modified embodiment may correspond to the best mode.

Embodiment 1

  The first embodiment of the present invention includes a “segment conductor”, a “segment stator” configured by using a plurality of the segment conductors as components, and a “rotating electric machine” having the stator. Each configuration and effect are closely related to each other.

(Segment conductor)
In the present embodiment, as shown in FIG. 1, the segment conductor 1 is made of a conductor wire having a substantially rectangular cross section, and includes a pair of straight portions 2 (21, 22) that are substantially parallel to each other, and both straight portions 21, 22. And a turn part 3 for connecting one end of each other.

  The feature of this embodiment is that the turn part 3 includes a plurality of flat parts 41 to 45 that are substantially orthogonal to the straight part 2 and a plurality of flat parts 41 to 45 that are connected in order with a predetermined step in the axial direction of the straight part 2. And having step portions 51 to 54. That is, the turn part 3 is provided with flat parts 41 to 45 and step parts 51 to 54 alternately, and the outer shape of the turn part 3 is formed in a pair of steps up and down.

  And in the turn part 3, the level | step difference between mutually adjacent flat parts 41-45 is substantially equivalent to the cross-sectional dimension of an axial direction among the cross-sectional shapes which the conductor wire in each flat part 41-45 has. However, the dimensional tolerance is set so that the level difference exceeds the cross-sectional dimension within a predetermined range. The segment conductor 1 is covered with an insulating film (not shown) except for the open ends (not shown) of the straight parts 21 and 22 of the straight parts 21 and 22 and the turn part 3. .

  For convenience of explanation, it is assumed that one of the linear portions 21 and 22 is shallowly accommodated in a slot of a stator core described later. On the other hand, the other straight line portion 22 should be accommodated deeper than the one straight line portion 21 by the predetermined number of slots (the thickness of the segment conductor 1). Then, the conductor wire is bent at the corner portion 30 at a substantially right angle from the straight portion 21 to form the first flat portion 41 of the turn portion 3. Here, the stepped portion from the first flat portion 41 to the uppermost flat portion 45 located near the center of the turn portion 3 is referred to as an upward stepped portion 31. Conversely, the stepped portion from the uppermost flat portion 45 to the corner portion 30 reaching the opposite linear portion 22 will be referred to as a downward stepped portion 32. That is, the turn part 3 is composed of a pair of steps 31 and 32 that are up and down.

  However, only the uppermost flat portion 45 is formed so as to be shifted by one layer (the thickness of the segment conductor 1) in the radial direction of the segment type coil 8 (see FIG. 2). Therefore, both the up and down stepped portions 31 and 32 are curved with a predetermined radius of curvature along the circumferential direction of the segment type coil 8, but the radius of curvature of the latter 32 is larger than the radius of curvature of the former 31. Is bigger by one.

  Therefore, in the turn portion 3 of the segment conductor 1, only the pair of up and down step portions 51 to 54 are skewed in the direction away from the end face of the stator core described later, and also the pair of up and down flat portions 41. ˜45 are generally parallel to the core end face. Therefore, even in the uppermost flat portion 45 that is the farthest from the core end surface in the vicinity of the center of the turn portion 3, the protruding height from the stator core is reduced as compared with the prior art. Such operational effects will be described in more detail in the next section.

(Segment type stator)
In the present embodiment, the segment type stator 6 includes a stator core 7 having a predetermined number of slots 70 formed in parallel with each other and a segment type coil 8 as shown in FIG. The segment type coil 8 is a stator coil in which a predetermined number of segment conductors 1 in which the straight portions 2 are accommodated in the slots 70 of the stator core 7 are connected to each other. The feature of the segment type stator 6 is that all the segment conductors 1 have the features described with reference to FIG.

  Here, in order to clarify the explanation, the stator 6 having the segment type coil 8 with the coil end portion 81 formed by the turn portion 3 of the segment conductor 1 on the upper side is erected along the gravity direction. Assume a state. A direction away from one end surface 71 of the stator core 7 along the axial direction is referred to as “upper” or “upper”, and conversely, a direction closer to the end surface 71 is referred to as “lower” or “lower”. To.

  Then, one straight portion 21 is accommodated in each adjacent slot 70 of the stator core 7, and the flat portions 41 to 45 ride on each other between the turn portions 3 of the segment conductors 1 adjacent in the circumferential direction. It has become.

  That is, when an arbitrary segment conductor 1 is taken up, the segment conductor protruding from the adjacent slot 70 on the first flat portion 41 (see FIG. 1) extending almost directly along the one end surface 71 of the stator core 7. The second flat portion 42 is on the turn portion 3 of one. And the 2nd flat part 42 which became one step higher from the 1st flat part 41 of the turn part 3 via the 1st level | step-difference part 51 of another segment conductor 1 extended from the adjacent slot 70 on the opposite side to the previous one. It rides on the first flat part 41 of the turn part 3. In this way, in the ascending stepped portion 31 of the turn portion 3, the same riding state is repeated for a predetermined number of flat portions 41 to 44, leading to the top flat portion (uppermost flat portion 45). The upper surface of the uppermost flat portion 45 corresponds to the top of the coil end portion 81 formed by the turn portion 3.

  Further, as shown in FIG. 1 again, the uppermost flat portion 45 is a flat portion on the top located near the center of the turn portion 3, and the upper stepped portion 31 and the lower portion are disposed on both sides of the uppermost flat portion 45. The step-like portion 32 is formed. The uppermost flat portion 45 is inclined at a predetermined angle with respect to the circumferential direction of the segment type coil, and the uppermost flat portion 45 has an upward stepped shape by one layer (corresponding to the radial thickness of the segment conductor 1). The portion 31 and the downward stepped portion 32 are shifted from each other in the radial direction of the segment type coil. That is, in terms of the position occupied in the segment type coil, the position of the descending step-like portion 32 is shifted by one layer to the centrifugal side from the position of the ascending step-like portion 31, and the descending step-like portion 32. The curvature radius of is increased by a further amount than the curvature radius of the upward staircase portion 31.

  On the other hand, in the downward stepped portion 32 of the turn portion 3 of the arbitrary segment conductor 1, each turn conductor 3 between the turn portions 3 of the segment conductor 1 adjacent in the reverse direction to the previous stepped portion 31 is provided. The flat portions (the reference numerals are omitted in FIG. 1) ride on each other and reach the flat portion closest to the other straight line portion 22. This flat portion is another first flat portion that is substantially symmetrical to the first flat portion 41 with the uppermost flat portion interposed therebetween. That is, the first flat portion 41 is in the ascending stepped portion 31, but this first flat portion is in the lowest portion (closer to the core end surface 71) of the descending stepped portion 32. .

  Therefore, in the turn portion 3 of the segment conductor 1, only the pair of up and down step portions 51 to 54 are skewed in the direction away from the end face of the stator core described later, and also the pair of up and down flat portions 41. ˜45 are generally parallel to the core end face 71. Therefore, also in the uppermost flat portion 45 farthest from the core end face 71 near the center of the turn portion 3, as shown in FIG. 2 again, the protrusion height H from the stator core is disclosed in, for example, Patent Document 1. It is reduced from the prior art.

  As shown in FIG. 2 again, the protrusion height H of the coil end portion 81 formed by the turn portion 3 is reduced, and only a slight space remains between the coil end portion 81 and the core end surface 71. Absent. Therefore, a predetermined number of turn portions 3 are densely packed in the coil end portion 81, and adjacent turn portions 3 are in contact with each other. However, since the insulating film is formed on the surface of the turn part 3 as described above, a short circuit in the turn part 3 is prevented, and a slight amount formed inside the coil end part 81 as necessary. The space may be filled with an insulating resin and hardened. On the contrary, if there is any gap communicating with the inside of the coil end portion 81, the cooling of the coil end portion 81 can be improved when the coil end portion 81 is forcibly cooled, and the cooling effect can be improved. is there.

(Rotating electric machine)
In the present embodiment, the rotating electrical machine of the present invention (for example, MG1 and MG2 in FIG. 3) is coaxial with the stator 6 having the segment type coil 8 described above (see FIG. 2) and the segment type stator 6. And a rotor (not shown) supported on the shaft.

  In the rotating electrical machine of the present embodiment, the turn part 3 of the segment conductor 1 constituting the coil 8 of the segment type stator 6 is characterized as described above (see FIG. 1), and the protruding height of the turn part side coil end 81 is high. The height H is reduced (see FIG. 2). As a result, the axial dimension of the rotating electrical machine can be shortened, and the frame and the shaft can be shortened. This is effective in reducing the size and weight.

Embodiment 2

(Configuration of drive unit)
The driving apparatus 100 according to the second embodiment of the present invention is a so-called hybrid car driving apparatus. That is, as shown in FIG. 3, the driving device 100 includes a pair of rotating electric machines (first rotating electric machine MG1 and second rotating electric machine MG2) disposed coaxially so as to face each other, and an input shaft driven by the engine E. 111 and output means 130 for providing a driving force to the outside.

  Here, the input shaft 111 from the engine E, the hollow rotating shaft 91 as the shaft of the rotor 9 of the first rotating electrical machine MG1, and the rotating shaft 91 of the rotor 9 of the second rotating electrical machine MG2 face each other. It is connected to a torque split device 120 inserted between the rotating electrical machines MG1, MG2. In the first rotating electrical machine MG1 and the second rotating electrical machine MG2, the turn part side coil ends 81 of the respective segment type stators 6 are arranged in directions facing each other. In FIG. 3, the same code (6, 7, 8, 81, 9, 91) is assigned to the stator 8 and the rotor 9 of both the rotary electric machines MG1 and MG2, but such codes are shared. Does not necessarily imply that the parts of the rotary electric machines MG1, MG2 are of the same standard.

  The torque split device 120 is a device including a planetary gear and several clutches, and has an action of switching the operation mode of the drive device 100 according to a command from a control device (not shown). Further, the output means 130 transmits power from the driving device 100 to a driving wheel (not shown) of the vehicle by a power transmission gear or the like, or conversely takes in power from the driving wheel to the driving device 100 to generate power. It has.

  A feature of the driving device 100 is that both of the two sets of rotating electric machines MG1 and MG2 are rotating electric machines having the configuration described in detail in the first embodiment. That is, in the segment type stator 6 of each rotary electric machine MG1 and MG2, the projecting heights H1 and H2 of the coil end portion 81 formed by the turn portions 3 of a predetermined number of segment conductors 1 (see FIG. 1) have been conventionally It is reduced than the technology.

  In addition, although the density is high at the coil end portions 81 of both the rotary electric machines MG1 and MG2, since the coil end portion 81 is forcibly cooled by the cooling oil in the drive device 100, problems due to overheating are unlikely to occur.

(Function and effect of the drive unit)
Since the drive device 100 of the present embodiment is configured as described above, the following operational effects are exhibited.

  That is, as described above, in the two rotary electric machines MG1 and MG2 that are coaxially opposed to each other, the projecting heights H1 and H2 of the turn portion side coil end portion 81 of the segment type stator 6 are respectively lower than those of the prior art. . With respect to this effect, FIG. 4 shows a schematic configuration of a driving device 100P as a comparative example according to the prior art. In FIG. 3 (this embodiment) and FIG. 4 (comparative example), the protruding height of the coil end portion 81 is shown. When comparing (H1: H1P and H2: H2P), it is obvious.

  Further, the driving device 100 of the present embodiment is also reduced in the axial dimension of the frame (not shown) that stores the main part of the driving device 100 correspondingly. This effect is also apparent when the full lengths L and LP of the drive devices 100 and 100P are compared in FIG. 3 (this embodiment) and FIG. 4 (comparative example).

  If a specific numerical value is given, in the driving device 100P for a small passenger car class, the protrusion heights H1P and H2P (see FIG. 4) of the coil end portion 81P according to the prior art are about 40 to 50 mm, respectively. However, in the driving device 100 of the present embodiment, the protruding heights H1 and H2 of the portion can be suppressed to about 10 to 15 mm, respectively. Therefore, the total length L in the present embodiment is larger than the total length LP of the comparative example. It can be shortened by about 50 to 80 mm.

  Therefore, according to the drive device 100 of the present embodiment, the total length L can be shortened by about 50 to 80 mm, and the volume and weight can be correspondingly reduced accordingly. Is obtained.

(Modification)
In the driving apparatus 100 of the present embodiment, as shown in FIG. 3 again, the turn part side coil ends 81 of the two rotary electric machines MG1 and MG2 face each other, but the deformation is such that they are arranged in the direction facing each other. Embodiments are possible. In this variation, depending on the spatial arrangement relationship with the torque split device 120, the shortening effect of the total length L may be the same as that of the above-described embodiment, or the shortening effect may be somewhat small. .

  In addition, a corresponding effect can be obtained even in a modified embodiment in which one of the rotating electric machines MG1 and MG2 is changed with respect to the driving apparatus 100 (see FIG. 3) of the present embodiment.

The perspective view which shows the principal part shape of the segment conductor as Embodiment 1 of this invention The perspective view which shows the shape of the turn part side coil end part in Embodiment 1 of this invention Sectional schematic diagram which shows schematic structure of the drive device as Embodiment 2 of this invention. Cross-sectional schematic diagram showing a schematic configuration of a driving device as a comparative example according to the prior art

Explanation of symbols

1: Segment conductor 2: Pair of straight portions (portions accommodated in slots of the stator core)
21: One straight line portion 22: The other straight line portion 3: Turn portion 30: Corner portion 31: Upward staircase portion 32: Downward staircase portion 4: Multiple flat portions (almost with respect to the end surface of the stator core) parallel)
41: First flat portion 42: Second flat portion 43: (Omitted)
45: Uppermost flat portion 5: Multiple step portions (skew with respect to the end surface of the stator core)
51, 52, 53, 54: Stepped portions 6: Segment type stator 7: Stator core 70: Slot 71: One end surface of stator core 8: Segment type coil 81: Coil end on turn side H: Turn Protrusion height 9 at the coil side of the part side: rotor 91: rotating shaft 100: driving device MG1: first rotating electric machine MG2: second rotating electric machine 111: input shaft of engine power 120: torque split device (planetary gear and clutch) Etc.)
130: Output means (including power transmission gear, etc.)
E: Engine H1: Projection height of turn part side coil end in first rotating electrical machine H2: Projection height of turn part side coil end in second rotating electrical machine L: Overall length of main part of drive unit -P: Suffix code of comparative example according to prior art

Claims (4)

A stator core formed with a plurality of slots parallel to each other;
A segment type coil in which a plurality of segment conductors in which straight portions are accommodated in these slots of the stator core are connected to each other;
In a segment type stator having
Each of the segment conductors is made of a conductor wire having a substantially rectangular cross-sectional shape, and has a pair of straight portions that are substantially parallel to each other, and a turn portion that connects one end of these straight portions to each other,
The turn part is
A plurality of flat portions that are substantially orthogonal to the straight portion, and a plurality of step portions that connect the flat portions with a predetermined step in the axial direction of the straight portion,
These flat portions and these step portions are alternately arranged, and the outer shape of this turn portion is formed in a pair of steps up and down ,
Segment type stator. In a rotating electrical machine having a stator having a segment type coil and a rotor supported coaxially with respect to the stator,
The stator is a segment type stator according to claim 1 ,
Rotating electric machine. In a drive device having a plurality of rotating electrical machines arranged coaxially with each other, an input shaft driven by an engine, and output means for providing a driving force to the outside,
At least one of these rotating electrical machines is the rotating electrical machine according to claim 2 ,
Drive device. All of the plurality of rotating electrical machines are the rotating electrical machines according to claim 2 ,
The drive device according to claim 3 .