JP2015180153A - Dynamo-electric device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dynamo-electric device in which readhesion of abrasion powder, separated from one phase, to other phases can be suppressed.SOLUTION: An electric motor 1A includes a rotating shaft 2, and a brush device 3A including a U-phase, a V-phase and a W-phase arranged in the direction of the axis Ax of the rotating shaft 2. A slip ring cover 7A provided in the brush device 3A has air introduction parts 12u, 12v, 12w introducing air to the inside, and air exhaust parts 13u, 13v, 13w provided at positions different from each other, with regard to the direction of the axis Ax, so as to correspond with respective phases. In a state arranged so that the rotating shaft 2 becomes horizontal, the air introduction parts 12u, 12v, 12w are arranged vertically above the axis Ax, and the air exhaust parts 13u, 13v, 13w are arranged vertically below the axis Ax, respectively.

Description

  The present invention relates to a rotating electrical machine including a rotating shaft and a brush device including at least three phases arranged in the direction of the axis of the rotating shaft.

  A three-phase motor is known in which a plurality of vents for allowing air to flow into a slip ring cover covering the brush device are formed and a shutter for adjusting the opening degree of each vent is provided (Patent Document 1). . This three-phase motor is provided with a partition plate that partitions each phase and an air guide plate that guides air to the partition plate in order to cool each phase equally.

Japanese Utility Model Publication No. 60-153656

  Although the three-phase motor of Patent Document 1 can cool each phase, it is difficult to remove brush abrasion powder generated by friction between the slip ring and the brush of each phase. Further, there is a possibility that the wear powder detached from one phase moves to another phase and reattaches. When the wear powder is reattached, it causes the brush wear in the phase where the wear powder is reattached.

  Then, an object of this invention is to provide the rotary electric machine which can suppress that the abrasion powder which detach | leaved from a certain phase adheres to another phase again.

  The rotating electrical machine of the present invention includes a rotating shaft and a brush device that is arranged in the direction of the axis of the rotating shaft and has a plurality of phases including at least three phases, and is provided on the outer periphery of the rotating shaft, The brush device includes a brush provided for each phase, a slip ring provided for each phase that rotates integrally with the rotating shaft while contacting the brush, and a slip ring that covers the brush and the slip ring. The slip ring cover is provided for each phase, and is provided at different positions with respect to the direction of the axis of the rotary shaft to allow air to flow outside. An air discharge portion that discharges to a position where the rotation shaft is disposed horizontally, and the air introduction portion is vertically above the axis of the rotation shaft, and the air discharge portion is the Vertically below the axis of the rotating shaft, in which are arranged, respectively (claim 1).

  According to this rotating electrical machine, independent exhaust for each phase becomes possible by the air discharge portion provided for each phase. Moreover, since each air discharge part is provided vertically downward, the abrasion powder which generate | occur | produced in each phase is discharged | emitted independently for every phase. Therefore, it can suppress that the abrasion powder detached from one phase reattaches to the other phase.

  As an aspect of the rotating electrical machine of the present invention, the air introduction section may correspond to each phase and may be provided at different positions with respect to the direction of the axis of the rotation shaft. According to this aspect, air can be allowed to flow independently for each phase.

  As one aspect of the rotating electrical machine of the present invention, the air discharge part may be arranged on a straight line parallel to the axis of the rotating shaft. According to this aspect, since each air discharge part is arrange | positioned on a straight line, the process for providing an air discharge part in a slip ring cover becomes easy. As a result, a reduction in processing costs can be expected. Moreover, the deviation for each phase of the flow rate of the air flowing through each phase can be reduced.

  As one aspect of the rotating electrical machine of the present invention, the plurality of phases include a clockwise path and a counterclockwise path around the axis of the rotating shaft from the air introduction section to the air discharge section. The air introduction portion corresponding to the specific phase has an opening direction inclined to the side where the path is long with respect to the radial direction toward the axis of the rotation shaft. (Claim 4). According to this aspect, since the opening direction of the air introduction part is inclined to the long side of the circumferential path centering on the axis of the rotation axis from the air introduction part to the air discharge part, this path is shorter than the short side. Air becomes easy to flow on the long side. Thereby, since the flow rate difference between the short side and the long side of this path can be reduced, it is possible to prevent the cooling for a specific phase from becoming uneven in the circumferential direction.

  As one aspect of the rotating electrical machine of the present invention, the brush device may further include an insulating member that is provided between two adjacent phases among the plurality of phases and extends in the radial direction. ). According to this aspect, since the insulating property can be ensured by the insulating member even if the interval between two adjacent phases is made closer, the interval between each phase can be made smaller than when no insulating member is present. Thereby, the dimension regarding the direction of the axis line of the rotating shaft of a rotary electric machine can be shortened. And since each phase is spatially partitioned when an insulating member spreads to a radial direction, the independence for every phase of the flow path from an air introduction part to an air discharge part improves.

  As one aspect of the rotating electrical machine of the present invention, the plurality of phases may be three phases. In the case where the plurality of phases are three phases, the opening area of the air introduction portion corresponding to the phase sandwiched between two phases among the three phases is that of the air introduction portion corresponding to the remaining phases. It may be larger than the opening area. Moreover, the opening area of the air discharge part corresponding to the phase sandwiched between two phases among the three phases may be larger than the opening area of the air discharge part corresponding to the remaining phase. 8). Of the three phases, the phase sandwiched between the two phases is difficult for heat to escape and tends to be hot. According to these aspects, since the opening area of the air introduction part or the air discharge part corresponding to the phase sandwiched between the two phases is larger than the opening area of the air introduction part or the air discharge part corresponding to the remaining phase, 2 The flow rate of air to the phase sandwiched between the two phases is greater than the flow rate of air to the other phase. Thereby, since the balance of the temperature of three phases can be equalize | homogenized, the abrasion amount of the brush and the lifetime of a brush depending on temperature can be equalized for every phase.

  As described above, according to the rotating electrical machine of the present invention, independent exhaust for each phase is enabled by the air discharge portion provided for each phase, and wear powder generated in each phase is also independent for each phase. Discharged. Thereby, it can suppress that the abrasion powder which detach | leaved from a certain phase reattaches to another phase.

The figure which showed typically the state which abbreviate | omitted the internal structure and looked at the electric motor which concerns on the 1st form of this invention from the axial direction of the rotating shaft. The figure which showed typically the cross section regarding the II-II line | wire of FIG. The figure which showed typically the cross section regarding the III-III line of FIG. The figure which showed typically the cross section regarding the IV-IV line | wire of FIG. The figure which showed typically the state which abbreviate | omitted the internal structure and looked at the electric motor which concerns on the 2nd form of this invention from the axial direction of the rotating shaft. The figure which showed typically the cross section regarding the VI-VI line of FIG. The figure which showed typically the cross section regarding the VII-VII line of FIG. The figure which showed typically the cross section regarding the VIII-VIII line of FIG. The figure which showed typically the cross section regarding the IX-IX line of FIG. The figure which showed typically the cross section regarding the XX line of FIG. The figure which showed typically the state which abbreviate | omitted the internal structure and looked at the electric motor which concerns on the 3rd form of this invention from the axial direction of the rotating shaft. The figure which showed typically the cross section regarding the XII-XII line | wire of FIG. The figure which showed typically the cross section regarding the XIII-XIII line | wire of FIG. The figure which showed typically the cross section regarding the XIV-XIV line | wire of FIG. The figure which showed typically the cross section regarding the XV-XV line | wire of FIG. The figure which showed typically the cross section regarding the XVI-XVI line | wire of FIG. The figure which showed the outline of the electric motor which concerns on the 4th form of this invention. The figure which showed the outline of the electric motor which concerns on the 5th form of this invention.

(First form)
A three-phase AC electric motor 1 </ b> A as a rotating electric machine, a part of which is shown in FIGS. 1 to 4, is incorporated in a driving device (not shown) of a vehicle such as an automobile. The electric motor 1A is provided on the outer periphery of the rotating shaft 2 and the rotating shaft 2, and supports a rotating shaft 2 and a brush device 3A for supporting the rotating shaft 2 and supplying a power to a rotor (not shown). And a housing 4 in which is housed.

  The rotating shaft 2 is configured by combining an inner shaft 2A and an outer shaft 2B mounted on the outer periphery of the inner shaft 2A. The inner shaft 2A is formed with an axial passage 2a formed along the axis Ax and a communication passage 2b that communicates with the axial passage 2a and extends in the radial direction and opens to the outer periphery of the inner shaft 2A. A cylindrical cylindrical passage 2c extending in the direction of the axis Ax is formed between the inner shaft 2A and the outer shaft 2B, and the cylindrical passage 2c communicates with the communication passage 2b. Therefore, when oil is supplied to the axial passage 2a, the oil is guided to the cylindrical passage 2c through the communication passage 2b, and the brush device 3A is cooled.

  The brush device 3A includes a U phase, a V phase, and a W phase, and these three U phase, V phase, and W phase are arranged in the direction of the axis Ax of the rotating shaft 2. The brush device 3 </ b> A rotates integrally with the rotating shaft 2 while being in contact with the brush 5, the slip ring 6 provided for each phase, and the slip covering the brush 5 and the slip ring 6. And a ring cover 7A. The brush 5 is held by a brush holding plate 8 provided for each phase. Each brush holding plate 8 is formed in the shape of a hollow disk extending outward in the radial direction. Each phase is spatially partitioned by each brush holding plate 8. Each brush holding plate 8 is provided with a brush holder (not shown) that holds the brush 5 so that the brush 5 is pressed against the slip ring 6. The slip ring 6 is fixed to the outer periphery of the rotating shaft 2 in a state where a part thereof is embedded in a resin member 9 made of an insulating material. The distance between the brush holding plate 8 and the slip ring 6 and the distance between the brush holding plate 8 and the slip ring cover 7A are set as small as possible. Thereby, since it becomes difficult for air to flow in the direction of the axis Ax, it is possible to suppress wear powder generated in a certain phase from moving to another phase.

  The outer periphery of the slip ring cover 7 </ b> A is covered with the housing 4. Between the slip ring cover 7A and the housing 4, air inflow passages 10u, 10v, 10w for supplying air to the brush device 3A and air outflow passages 11u, 11v, 11w for discharging air from the brush device 3A are provided. And are formed. As apparent from FIGS. 1 to 4, in this embodiment, the air inflow passages 10u, 10v, 10w and the air outflow passages 11u, 11v, 11w are provided for each phase.

  As shown in FIGS. 1 and 4, the U-phase air inflow passage 10 u includes an air introduction portion 12 u that is formed in the slip ring cover 7 </ b> A and guides air therein. The air introduction part 12u is located on the outer periphery of the U phase so as to correspond to the U phase, and is formed in the slip ring cover 7A as a through hole penetrating the slip ring cover 7A in the radial direction. Similarly, as shown in FIGS. 1 and 2, the V-phase air inflow passage 10v is located on the outer periphery of the V-phase and includes an air introduction portion 12v formed as a through-hole penetrating the slip ring cover 7A in the radial direction. Including. As shown in FIGS. 1 and 3, the W-phase air inflow path 10w is located on the outer periphery of the W-phase, and includes an air introduction portion 12w formed as a through-hole penetrating the slip ring cover 7A in the radial direction. .

  As shown in FIGS. 1 and 4, the U-phase air outflow passage 11 u includes an air discharge portion 13 u formed in the slip ring cover 7 </ b> A to discharge air to the outside. The air discharge portion 13u is located on the outer periphery of the U phase so as to correspond to the U phase, and is formed in the slip ring cover 7A as a through hole penetrating the slip ring cover 7A in the radial direction. Similarly, as shown in FIGS. 1 and 2, the V-phase air outflow passage 11v is located on the outer periphery of the V-phase and includes an air discharge portion 13v formed as a through-hole penetrating the slip ring cover 7A in the radial direction. Including. As shown in FIGS. 1 and 3, the W-phase air outflow passage 11w is located on the outer periphery of the W-phase and includes an air discharge portion 13w formed as a through-hole penetrating the slip ring cover 7A in the radial direction. .

  The air introduction parts 12u, 12v, 12w are provided at different positions with respect to the direction of the axis Ax so as to correspond to each phase. The air discharge portions 13u, 13v, and 13w are also provided at different positions with respect to the direction of the axis Ax so as to correspond to each phase. Therefore, as shown by the arrows in FIGS. 2 to 4, air can be introduced and discharged independently for each phase. In addition, as shown in FIGS. 1 to 4, in a state where the rotating shaft 2 of the electric motor 1 </ b> A is horizontally arranged, the air introduction parts 12 u, 12 v, 12 w are vertically above the axis Ax, the air discharge part 13 u, 13v and 13w are arranged vertically below the axis Ax. Since the air discharge portions 13u, 13v, and 13w are provided vertically downward, air is discharged independently for each phase, and wear powder generated in each phase is also discharged independently for each phase. Therefore, it can suppress that the abrasion powder detached from one phase reattaches to the other phase.

  As shown in FIGS. 2 to 4, the opening area of the V-phase air introduction part 12v is the opening area of the U-phase air introduction part 12u and the opening area of the W-phase air introduction part 12w. Greater than either. Further, the opening area of the V-phase air discharge portion 13v is larger than both the opening area of the U-phase air discharge portion 13u and the opening area of the W-phase air discharge portion 13w. Of the U phase, the V phase, and the W phase, the V phase sandwiched between the U phase and the W phase is difficult to escape from heat and is likely to be at a high temperature. According to this embodiment, since the opening areas of the V-phase air introduction part 12v and the air discharge part 13v are set as described above, the flow rate of air to the V-phase, which is likely to become high temperature, is reduced to other phases. It becomes larger than the air flow rate. Thereby, since the balance of the temperature of three phases can be equalize | homogenized, the abrasion amount of the brush and the lifetime of a brush depending on temperature can be equalized for every phase.

  In this embodiment, since the U phase tends to be hotter than the W phase, the opening area of the U-phase air inlet 12u is set larger than the W-phase air inlet 12u, The opening area of the U-phase air discharge part 13u is set larger than the opening area of the W-phase air discharge part 13w. That is, in this embodiment, the opening areas of the air introduction parts 12u, 12v, 12w of each phase are set so as to correspond to the temperature of each phase, and the air discharge parts 13u, 13v, 13w of each phase are set. The opening area is set. Therefore, leveling of the brush wear amount and brush life is further improved.

  Further, in this embodiment, when the opening area of the air introduction parts 12u, 12v, 12w and the opening area of the air discharge parts 13u, 13v, 13w are compared in the same phase, the opening area of the air discharge parts 13u, 13v, 13w is It is set larger than the opening area of the air introduction parts 12u, 12v, 12w. This makes it difficult for the air discharge portions 13u, 13v, 13w to be clogged by the wear powder generated in each phase, and enables effective discharge of the wear powder.

(Second form)
Next, a second embodiment of the present invention will be described with reference to FIGS. The electric motor 1B according to the second embodiment is the same as the first embodiment except for the configuration of the brush device 3B including the slip ring cover 7B. Hereinafter, the same reference numerals are attached to the same components as those in the first embodiment, and the description thereof is omitted.

  The brush device 3B is different from the brush device 3A of the first embodiment in the configuration of the air outflow passage 21 formed by the slip ring cover 7B and the housing 4. That is, the air outflow path 21 is provided in common for the U phase, the V phase, and the W phase. The air outflow passage 21 extends in the direction of the axis Ax. The air outflow path 21 includes air discharge portions 23u, 23v, and 23w provided at different positions with respect to the direction of the axis Ax so as to correspond to each phase. The U-phase air discharge portion 23u is located on the outer periphery of the U-phase, the V-phase air discharge portion 23v is located on the outer periphery of the V-phase, and the W-phase air discharge portion 23w is located on the outer periphery of the W-phase. The parts 23u, 23v, 23w are arranged on a straight line La parallel to the axis Ax. And the opening area of each air discharge part 23u, 23v, 23w is the same.

  In this embodiment, the air outflow passage 21 is provided in common for the U phase, the V phase, and the W phase. For this reason, as shown in FIGS. 8 and 9, for the U phase, the circumferential path from the air introduction part 12u to the air discharge part 23u centering on the axis Ax is between clockwise and counterclockwise. Is different. That is, for the U phase, the clockwise path is longer than the counterclockwise path. Therefore, if the opening direction of the air introduction part 12u is set to the radial direction toward the axis Ax, it becomes difficult for air to flow through the clockwise path. Therefore, in this embodiment, the opening direction of the air introduction part 12u is inclined to the side where the path is long. For the same reason, as shown in FIG. 7 and FIG. 10, the opening direction of the air introduction part 12 w is also on the longer path side for the W phase where the path differs between clockwise and counterclockwise. Tilted. Such inclination of the opening direction makes it easier for air to flow to the longer side of the U phase and W phase than to the shorter path side, so that the flow rate difference between the shorter path side and the longer side can be reduced. . Therefore, it can suppress that the cooling with respect to U phase and W phase becomes non-uniform | heterogenous regarding the circumferential direction. The U phase and the W phase correspond to specific phases according to the present invention.

  According to this embodiment, since the common air outflow path 21 is provided for each phase, the number of processes can be reduced as compared with the case where an air outflow path is provided for each phase. Moreover, since each air discharge part 23u, 23v, 23w is arrange | positioned on the straight line La, the process for providing air discharge part 23u, 23v, 23w in the slip ring cover 7B becomes easy. As a result, a reduction in processing costs can be expected. Moreover, the deviation for each phase of the flow rate of the air flowing through each phase can be reduced.

(Third form)
Next, a third embodiment of the present invention will be described with reference to FIGS. The electric motor 1C according to the third embodiment is the same as the first embodiment except for the configuration of the brush device 3C including the slip ring cover 7C. Hereinafter, the same reference numerals are attached to the same components as those in the first embodiment, and the description thereof is omitted.

  The brush device 3C is different from the brush device 3A of the first embodiment in the configuration of the air inflow path 30 formed by the slip ring cover 7C and the housing 4. That is, the air inflow path 30 is provided in common for the U phase, the V phase, and the W phase. The air inflow path 30 extends in the direction of the axis Ax. The air inflow path 30 includes air introducing portions 32u, 32v, and 32w provided at different positions with respect to the direction of the axis Ax so as to correspond to each phase. The U-phase air introduction part 32u is located on the outer periphery of the U-phase, the V-phase air introduction part 32v is located on the outer periphery of the V-phase, and the W-phase air introduction part 32w is located on the outer periphery of the W-phase. The parts 32u, 32v, 32w are disposed on a straight line Lb parallel to the axis Ax. In consideration of the fact that the temperature of the V phase tends to be the highest, the opening area of the V phase air introduction part 32v is larger than the opening area of the U phase air introduction part 32u and the W phase air introduction part 32w. Is also set larger.

  In this embodiment, the air inflow passage 30 is provided in common for the U phase, the V phase, and the W phase. For this reason, as shown in FIGS. 14 and 15, for the U phase, the circumferential path centering on the axis Ax from the air introduction part 32u to the air discharge part 13u is between clockwise and counterclockwise. Is different. That is, for the U phase, the counterclockwise path is longer than the clockwise path. Therefore, if the opening direction of the air introduction portion 32u is set in the radial direction toward the axis Ax, it is difficult for air to flow through the counterclockwise path. Therefore, in this embodiment, the opening direction of the air introduction part 32u is inclined to the side where the path is long. For the same reason, as shown in FIG. 13 and FIG. 16, the opening direction of the air introduction part 32 w is also inclined to the longer path side for the W phase whose path is different between clockwise and counterclockwise. It has been. Therefore, this form can acquire the same effect as a 2nd form, and U phase and W phase correspond to the specific phase concerning the present invention.

(4th form)
Next, a fourth embodiment of the present invention will be described with reference to FIG. The 4th form can be implemented as a form applied to the 1st-3rd form mentioned above. FIG. 17 shows a form applied to the first form. The same reference numerals are attached to the same components as those in the first embodiment, and the description thereof is omitted.

  In the electric motor 1D according to the fourth embodiment, an insulating plate 40 as an insulating member that extends radially away from the axis Ax is provided between the U phase and the V phase and between the V phase and the W phase. Is provided. The insulating plate 40 is formed in a hollow disk shape, and its central portion 40 a is fixed to the resin member 9. The outer peripheral edge 40b of the insulating plate 40 is close to the slip ring cover 7A with an appropriate clearance secured.

  According to this embodiment, even if the distance between the adjacent U phase and the V phase and the distance between the adjacent V phase and the W phase are close to each other, insulation can be ensured by the insulating plate 40, so that the insulating plate 40 does not exist These intervals can be made smaller. Thereby, the dimension regarding the direction of the axis line Ax can be shortened compared with the case where the insulating plate 40 does not exist. In addition, since each phase is spatially partitioned by the expansion of the insulating plate 40 in the radial direction, the independence for each phase of the flow path from the air inlets 12u, 12v, 12w to the air outlets 13u, 13v, 13w is achieved. improves.

(5th form)
Next, a fifth embodiment of the present invention will be described with reference to FIG. The fifth mode can be implemented as a mode applied to the first to fourth modes described above. FIG. 18 shows a form applied to the first form. The same reference numerals are attached to the same components as those in the first embodiment, and the description thereof is omitted.

  The electric motor 1 </ b> E according to the fifth embodiment is characterized by a cooling method using oil via the rotating shaft 2. As described above, since the V phase is sandwiched between the U phase and the W phase, the temperature tends to be high. In the electric motor 1E, the opening position of the communication path 2b formed in the rotating shaft 2 is set to a position corresponding to the V phase, and the opening area of the V phase air introducing portion 12v is the air introducing portion of the other phase. The opening area is set larger than 12u and 12w. Thus, efficient and uniform cooling can be achieved in each phase by the interaction between cooling with oil and cooling with air.

  The present invention is not limited to the above embodiments, and can be implemented in various forms within the scope of the gist of the present invention. In each of the above embodiments, an electric motor is illustrated as an example of a rotating electrical machine. However, as the rotating electrical machine, various electric motors, generators, motors / generators, and the like that require energization with a rotor provided on a rotating shaft. It may be.

  In each of the above embodiments, the air introduction part is provided at a position corresponding to each phase. However, as long as the air introduction part is located vertically above the axis, the number and position of the air introduction parts are arbitrary. For example, it is also possible to implement in a form in which a single air introduction part having a size straddling each phase is formed in the slip ring cover.

  In each of the above embodiments, cooling is also performed by supplying oil to the rotating shaft, but cooling with oil is not essential. It is also possible to implement the present invention in a form in which cooling with oil is not performed.

  In each of the above embodiments, an electric motor is illustrated as an example of a rotating electrical machine having three phases, but the present invention is not limited to the number of phases as long as there are three or more. The present invention can be applied to a rotating electrical machine such as an electric motor, a generator, and a motor / generator having three or more phases, for example, 3N (N is a natural number of 1 or more) phases. The insulating plate as the insulating member can be provided between two adjacent phases among the three or more phases.

1A to 1E Electric motor (Rotating electric machine)
2 Rotating shafts 3A to 3C Brush device 5 Brush 6 Slip ring 7A to 7C Slip ring cover 12u, 12v, 12w, 32u, 32v, 32w Air introduction part 13u, 13v, 13w, 23u, 23v, 23w Air discharge part 40 Insulating plate (Insulating material)
Ax Axis La, Lb straight line

Claims (8)

A rotating shaft and a brush device arranged in the direction of the axis of the rotating shaft and having a plurality of phases including at least three phases and provided on the outer periphery of the rotating shaft;
The brush device includes a brush provided for each phase, a slip ring provided for each phase, and a slip covering the brush and the slip ring. A ring cover,
The slip ring cover includes an air introduction part that guides air to the inside, an air discharge part that corresponds to each phase and that is provided at different positions with respect to the direction of the axis of the rotating shaft, and discharges air to the outside. Have
In a state where the rotating shaft is arranged horizontally, the air introduction portion is vertically above the axis of the rotating shaft, and the air discharge portion is vertically below the axis of the rotating shaft, respectively. A rotating electric machine characterized by being arranged.   2. The rotating electrical machine according to claim 1, wherein the air introduction section corresponds to each phase and is provided at different positions with respect to the direction of the axis of the rotating shaft.   The rotating electrical machine according to claim 1, wherein the air discharge unit is disposed on a straight line parallel to the axis of the rotating shaft. The plurality of phases includes a specific phase in which a circumferential path around the axis of the rotation shaft from the air introduction part to the air discharge part is different between clockwise and counterclockwise. And
The said air introduction part corresponding to the said specific phase has an opening direction inclined in the side where the said path | route is long with respect to the radial direction which goes to the said axial line of the said rotating shaft. Rotating electric machine.   5. The rotating electrical machine according to claim 1, wherein the brush device further includes an insulating member that is provided between two adjacent phases among the plurality of phases and extends in a radial direction.   The rotating electrical machine according to any one of claims 1 to 5, wherein the plurality of phases are three phases.   The rotating electrical machine according to claim 6, wherein an opening area of the air introduction part corresponding to a phase sandwiched between two phases among the three phases is larger than an opening area of the air introduction part corresponding to the remaining phase. .   The opening area of the air discharge part corresponding to the phase sandwiched between two phases among the three phases is larger than the opening area of the air discharge part corresponding to the remaining phase. Rotating electric machine.

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