JP6225730B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine such as a motor and a generator, and more particularly to a rotating electrical machine that can cool a rotating electrical machine and its periphery.

  Conventionally, as a rotating electrical machine, a motor in which a rotor is arranged inside a stator is known. When such a rotating electrical machine is operated, heat is generated in the rotating electrical machine itself or in an external device that is linked to the driving of the rotating electrical machine. To do. One of the problems in rotating electrical machines is that the heat generated in this way is cooled by an appropriate method.

  As an invention relating to a rotating electrical machine capable of cooling heat by an appropriate method, for example, an invention described in Patent Document 1 is known. The motor described in Patent Document 1 is configured by accommodating a rotor fixed to a rotating shaft and a stator disposed around the rotor in a motor case, and is wound around the stator. It drives by rotating a rotor and a rotating shaft by sending an electric current through a stator coil. Here, in the motor described in Patent Document 1, the rotation shaft is formed in a hollow shape, and fins in which a wire is formed in a spiral shape are disposed therein.

JP 2002-034189 A

  As described above, in the rotating electrical machine described in Patent Document 1, the spiral fin is fixed inside the hollow rotating shaft, and the rotating shaft rotates together with the rotor. Therefore, when the rotating shaft rotates together with the rotor, an air flow along the axial direction of the rotating shaft is generated in the hollow portion of the rotating shaft due to the helical shape of the fin. The rotating electrical machine described in Patent Literature 1 can promote heat exchange with the rotating shaft by generating an air flow inside the rotating shaft, and can cool the rotating electrical machine. In such a rotating electrical machine, there is a demand for a rotating electrical machine that has a simpler configuration and that can generate an airflow in a hollow rotating shaft and can be efficiently cooled by the airflow.

  The present invention relates to a rotating electrical machine and a rotating electrical machine capable of cooling the periphery thereof, and provides a rotating electrical machine that can cool the rotating electrical machine and the like more efficiently by generating an air flow in a hollow rotating shaft.

A rotating electrical machine according to one aspect of the present invention is fixed to a rotating shaft that is rotatably arranged, and rotates with the rotating shaft, a stator core that is disposed on the radially outer side of the rotor, A stator having a coil wound around the stator core and configured by a conductive wire; and a coil end portion formed by a conductive wire that protrudes in an axial direction from the axial end surface of the stator core and forms the coil; the rotor and the stator; A rotary electric machine having a housing in which the rotary shaft is formed on one side in the axial direction along the rotary shaft and on the one side with respect to the axial end surface of the rotor And a refrigerant passage that communicates with the discharge port formed on the other side of the axial end surface of the rotor that is on the other side in the axial direction. Te, the position between the said inlet and the outlet, have a plurality of fan members for causing a flow in the coolant, the plurality of fan member has a plurality of blade portions within each cylindrical member has the plurality of fan member, said plurality of vanes of each fan member is arranged so as to draw a spiral according to the axial direction of said rotary shaft and said Rukoto.

The rotating electrical machine is configured by housing a rotor fixed to a rotating shaft and a stator disposed radially outside the rotor in a housing, and rotating the rotor together with the rotating shaft. To drive. The rotating shaft has a suction port on one side of the rotor axial end surface and a discharge port on the other side of the rotor axial end surface. Further, the rotating shaft has a refrigerant passage that connects the suction port and the discharge port, and a plurality of fan members for generating a flow of the refrigerant between the suction port and the discharge port in the refrigerant passage. Have. Each of the plurality of fan members has a plurality of blade portions inside the cylindrical member, and the plurality of blade portions of each fan member are arranged so as to draw a spiral according to the axial direction of the rotation axis.
Therefore, according to the rotating electrical machine, the rotation of the rotor and the rotating shaft causes the plurality of fan members to rotate together with the rotating shaft inside the refrigerant passage, so that a flow can be generated in the refrigerant inside the refrigerant passage. Thereby, according to the rotating electrical machine, the refrigerant on one side of the axial end surface of the rotor is introduced into the refrigerant passage through the suction port, and the other side of the rotor from the axial end surface of the rotor through the discharge port. Therefore, the rotating electrical machine and its peripheral devices can be cooled using the circulation of the refrigerant.
Further, since the plurality of fan members are arranged so that the blade portions of each fan member form a spiral according to the axial direction of the rotation shaft, a strong refrigerant flow can be generated in the refrigerant passage. And the peripheral device can be cooled more efficiently.

The rotary electric machine according to another aspect of the present invention, there is provided a rotary electric machine according to claim 1, wherein said fan member, an internal pre-Symbol refrigerant passage, between the inlet and the outlet It is characterized by being fixed by shrink fitting at the position.

In the rotary electric machine, the fan member is an internal pre Symbol refrigerant passage, and is fixed by shrink fitting to position between the said inlet and the outlet. Thus, according to the rotary electric machine, the fan member by shrink-fitting can be fixed in a predetermined position inside the refrigerant passage, a more simple operation, cool the rotary electric machine and its peripheral devices A possible rotating electrical machine can be realized.

A rotating electrical machine according to another aspect of the present invention is the rotating electrical machine according to claim 1 or 2 , wherein the refrigerant passage of the rotating shaft is formed by a groove that draws a spiral according to the axial direction of the rotating shaft. It has a configured screw groove on the inner wall surface of the refrigerant passage.

  In the rotating electrical machine, the refrigerant passage of the rotating shaft has a thread groove portion formed by a groove that draws a spiral in the axial direction of the rotating shaft on the inner wall surface of the refrigerant passage. The contact area can be increased, and the cooling efficiency in the rotor can be increased.

A rotating electrical machine according to another aspect of the present invention is fixed to a rotating shaft that is rotatably disposed, and is disposed on a rotor that rotates together with the rotating shaft and on a radially outer side of the rotor. A stator having a stator core, a coil wound around the stator core and configured by a conducting wire, a coil end portion projecting in an axial direction from an axial end surface of the stator core and configured by the conducting wire constituting the coil, and the rotor A rotating electrical machine having a housing that houses the stator therein, wherein the rotating shaft is on one side of the axial direction along the rotating shaft, on one side of the axial end surface of the rotor, and the opened suction port on the outer peripheral surface of the rotary shaft, than the axial end surface of the rotor corresponding to the axial direction other side located in the axially other side, said at the other side The refrigerant passage communicating between the opened outlet on the end face of the rotating shaft, has therein an internal of the refrigerant passage, a position between the said inlet and the outlet, have a fan Then, on the one end side with respect to the axial end face of the rotor and the intake port, by rotating together with the rotating shaft, a flow of refrigerant toward the axial direction of the rotor is generated, and the coil end portion of the stator is characterized Rukoto to have a external fan member for cooling.

The rotating electrical machine is configured by housing a rotor fixed to a rotating shaft and a stator disposed radially outside the rotor in a housing, and rotating the rotor together with the rotating shaft. To drive. The rotating shaft has a suction port opened on the outer peripheral surface of the rotating shaft on one side from the axial end surface of the rotor, and is located on the other side in the axial direction from the axial end surface of the rotor. It has a discharge port opened at the end face of the rotating shaft. Further, the rotating shaft has a refrigerant passage that connects the suction port and the discharge port, and has a fan between the suction port and the discharge port inside the refrigerant passage. Further, the rotating shaft rotates together with the rotating shaft on one side of the rotor axial end face and the suction port, thereby generating a refrigerant flow in the axial direction of the rotor and cooling the coil end portion of the stator. An external fan member is provided.
Therefore, according to the rotating electrical machine, the rotation of the rotor and the rotating shaft causes the fan to rotate with the rotating shaft inside the refrigerant passage, so that a flow can be generated in the refrigerant inside the refrigerant passage. Thereby, according to the rotating electrical machine, the refrigerant on one side of the axial end surface of the rotor is introduced into the refrigerant passage through the suction port, and the other side of the rotor from the axial end surface of the rotor through the discharge port. Therefore, the rotating electrical machine and its peripheral devices can be cooled using the circulation of the refrigerant.
Further, in the rotating electric machine, the suction port of the rotating shaft is opened on the outer peripheral surface of the rotating shaft on one axial side of the axial end surface of the rotor. Here, on one side of the end surface in the axial direction of the rotor, the coil end portion of the stator is located on the radially outer side of the rotor, and the coil end portion and the rotor (secondary conductor and magnet) are As it is driven, it generates heat and the ambient temperature rises. Therefore, according to the rotating electrical machine, the refrigerant around the coil end portion and the rotor that has risen with driving is sucked through the suction port, and through the discharge port that is opened on the end surface of the rotating shaft on the other side. , Can be discharged outside the housing of the rotating electrical machine, and can be cooled using a refrigerant.
Further, the rotating electrical machine has an external fan member on one side of the rotor axial end surface and the intake port, and the external fan member rotates together with the rotating shaft, so that the axial direction of the rotor By generating an air flow toward (the rotor and the stator), the coil end portion of the stator and the rotor can be cooled. Thereby, according to the said rotary electric machine, a rotary electric machine (especially a coil end part and a rotor) can be cooled more efficiently with the fan arrange | positioned in a refrigerant path, and an external fan member.
In addition, air blown by the external fan member can inhale air exchanged with the coil end portion through the intake port and exhaust it through the exhaust port opened at the end surface of the rotating shaft. Further, the rotating electrical machine (particularly, the coil end portion) can be cooled more efficiently.

A rotating electrical machine according to another aspect of the present invention is the rotating electrical machine according to any one of claims 1 to 4 , wherein the rotating shaft has a plurality of shafts whose axial length is shorter than the rotating shaft. It is characterized in that it is constituted by joining the end faces of the shaped member by friction welding.

  In the rotating electrical machine, the rotating shaft is configured by joining end faces of a plurality of shaft-like members having an axial length shorter than that of the rotating shaft by friction welding. In addition, fan installation work and the like at a predetermined position in the refrigerant passage can be performed more easily.

It is sectional drawing which shows schematic structure of the rotary electric machine which concerns on 1st Embodiment. It is an expanded sectional view which shows the principal part of the rotary electric machine which concerns on 1st Embodiment. It is an expanded sectional view of the rotating shaft of the rotary electric machine which concerns on 1st Embodiment. It is explanatory drawing which shows arrangement | positioning of the 1st fan member-the 4th fan member with respect to the rotating shaft in the rotary electric machine which concerns on 1st Embodiment. It is an external appearance perspective view of each fan member in 1st Embodiment. It is a front view of each fan member in a 1st embodiment. It is a front view which shows each fan member of the state arrange | positioned in the ventilation path of a rotating shaft. It is explanatory drawing which shows arrangement | positioning of the fan member with respect to the rotating shaft in the rotary electric machine which concerns on 2nd Embodiment. It is an external appearance perspective view of the fan member in 2nd Embodiment. It is a front view of the fan member in a 2nd embodiment. It is sectional drawing which shows schematic structure of the rotary electric machine which concerns on 3rd Embodiment.

  Hereinafter, an embodiment (first embodiment) in which a rotating electrical machine according to the present invention is embodied in the rotating electrical machine 1 will be described in detail with reference to the drawings. In the following description, when the rotating shaft 20 of the rotating electrical machine 1 is disposed so as to be parallel to the placement surface, the axial direction of the rotating shaft 20 is defined as the front-rear direction of the rotating electrical machine 1. The vertical direction and the horizontal direction of the rotating electrical machine 1 are defined and described with reference to the rotating electrical machine 1 in this state.

(First embodiment)
First, a schematic configuration of the rotating electrical machine 1 according to the first embodiment will be described in detail with reference to FIG. The rotating electrical machine 1 according to the first embodiment constitutes, for example, a vehicle drive device, and is housed in a motor case 50 disposed between the power transmission unit B and the inverter unit I. As shown in FIG. 1, the rotating electrical machine 1 is a squirrel-cage three-phase induction motor, and includes a rotor 10 configured as a squirrel-cage rotor and a stator 40 that generates a rotating magnetic flux by a three-phase alternating current. Has been. The rotating electrical machine 1 links the rotor 10 with a rotating shaft by interlinking a rotating magnetic flux generated from a stator 40 described later and an induced current generated in the secondary conductor 12 of the rotor 10 configured as a cage rotor. Rotate with 20 The power transmission unit B is, for example, a gear box or a mechanism that transmits a rotational force such as a gear or a pulley.

  The rotor 10 of the rotating electrical machine 1 according to the first embodiment is configured as a squirrel-cage rotor, and is fixed to be rotatable around the axis of the rotary shaft 20. As shown in FIGS. 1 and 2, the rotor 10 is joined to a cylindrical rotor core 11, a plurality of secondary conductors 12 distributed in the circumferential direction of the rotor core 11, and both axial ends of the secondary conductor 12. And an end ring 13.

  The rotor core 11 is configured in a cylindrical shape so as to surround the rotating shaft 20 by laminating a plurality of plates made of electromagnetic steel plates, and is fixed to the rotating shaft 20. Further, the outer peripheral surface of the rotor core 11 faces the inner peripheral surface (the surface on the rotating shaft 20 side) of the stator 40 in a state of being spaced apart.

  The plurality of secondary conductors 12 are formed in a solid rod shape by a conductive material, and are distributed at equal intervals along the circumferential direction of the rotor core 11. As shown in FIG. 1, each secondary conductor 12 is arranged to extend in a straight line along the axial direction of the rotor core 11. Further, the length dimension of each secondary conductor 12 is formed substantially equal to the axial dimension of the rotor core 11.

  The end ring 13 is a member called an end ring or a short-circuit ring, and is formed in an annular shape by a conductive material in the same manner as the secondary conductor 12. The end ring 13 is disposed along both end faces of the rotor core 11 in the axial direction of the rotary shaft 20, and is joined to the end of each secondary conductor 12. Thereby, each secondary conductor 12 is short-circuited by being joined to the pair of end rings 13.

  The rotating shaft 20 is rotatably supported in the motor case 50 via a bearing 55 disposed in the motor case 50, and functions as the rotation center of the rotor 10 (see FIG. 1). The rotation shaft 20 extends in the front-rear direction at the center of the stator 40 in the vertical cross section of the rotating electrical machine 1 and functions as the rotation center of the rotor 10.

  As shown in FIG. 1, the rotating shaft 20 is a shaft member formed in a hollow shape, and includes a ventilation path 21 as a refrigerant passage, an intake port 23 as an intake port, and an exhaust port 24 as an exhaust port. Have. The ventilation path 21 extends along the axial direction of the rotary shaft 20, and connects the intake port 23 and the exhaust port 24.

  As shown in FIG. 1, the air inlet 23 is formed closer to the inverter unit I than the axial end surface of the rotor 10 on the inverter unit I side. In the first embodiment, the air inlets 23 are formed on the end surface of the rotating shaft 20 on the inverter unit I side, and are further formed at a plurality of locations on the outer peripheral surface of the rotating shaft 20 on the inverter unit I side. The intake port 23 functions as an opening that sucks air as a refrigerant located on the inverter unit I side into the air passage 21.

  In the first embodiment, there are a plurality of intake ports 23 on the end surface of the rotating shaft 20 located on one side (that is, on the inverter unit I side) of the rotor 10 in the axial direction and on the outer peripheral surface of the rotating shaft 20. Although it is formed at a location, it is not limited to this position. If it is the inverter unit I side from the axial end surface of the rotor 10, the air inlet 23 can be formed at various locations on the rotating shaft 20.

  As shown in FIG. 1, the exhaust port 24 is formed closer to the power transmission unit B than the axial end surface of the rotor 10 on the power transmission unit B side. In the first embodiment, the exhaust port 24 is not shown, but is formed on the end surface of the rotary shaft 20 on the side of the power transmission unit B. For example, if a gear or pulley is connected, the gear or pulley is connected. It is formed on the end face of the rotating shaft 20 that penetrates. And the exhaust port 24 functions as an opening part which exhausts the air inside the ventilation path 21 to the power transmission part B side.

  In the first embodiment, the exhaust port 24 is formed on the end surface of the rotary shaft 20 located on the other side (that is, the power transmission part B side) than the axial end surface of the rotor 10. The position is not limited. The exhaust port 24 can be formed at various locations on the rotary shaft 20 as long as it is on the side of the power transmission unit B with respect to the axial end surface of the rotor 10.

  As shown in FIG. 3, the rotating shaft 20 is formed by joining a plurality of shaft-like members 20A. Each shaft member 20 </ b> A is a substantially cylindrical member having an axial length shorter than that of the rotating shaft 20. The rotating shaft 20 is configured, for example, by friction-welding the end surfaces of the respective shaft-shaped members 20A to each other. A screw groove that draws a spiral in accordance with the axial direction of the rotary shaft 20 is formed on the inner wall surface of the air passage 21 formed inside the rotary shaft 20 to form a threaded surface 22 (see FIG. 3). ).

  As shown in FIGS. 1 and 2, the fan member 30 is fixed between the air inlet 23 and the air outlet 24 by shrink fitting inside the air passage 21 of the rotary shaft 20. The fan member 30 has a plurality of blade portions 31 that draw a spiral in the axial direction of the fan member 30 inside the cylindrical member. By rotating the fan member 30, an airflow directed in the axial direction is generated. Let

  In the first embodiment, as the fan member 30, the first fan member 30 </ b> A to the fourth fan member 30 </ b> D are fixed between the intake port 23 and the exhaust port 24 inside the air passage 21 by shrink fitting. (See FIGS. 1 to 3). Specifically, the first fan member 30A, the second fan member 30B, the third fan member 30C, the fourth fan member 30A, the second fan member 30B, the fourth fan member 30C, the fourth fan member 30C, and the fourth fan member 30C are arranged from the intake port 23 side located on the inverter unit I side. The fan members 30D are fixed in this order. The inner wall surface of the air passage 21 to which the fan members 30 (the first fan member 30A to the fourth fan member 30D) are fixed may be a threaded surface 22 or may not be threaded. Also good.

  In the first embodiment, the first fan member 30 </ b> A to the fourth fan member 30 </ b> D have basically the same configuration except for positions where they are fixed in the air passage 21. In the following description, the blade portion 31 in the first fan member 30A is referred to as “first blade portion 31A”, and the blade portion 31 in the second fan member 30B is referred to as “second blade portion 31B”. The blade portion 31 of the third fan member 30C is referred to as “third blade portion 31C”, and the blade portion 31 of the fourth fan member 30D is referred to as “fourth blade portion 31D”.

  As shown in FIGS. 5 and 6, in the first embodiment, the second fan member 30 </ b> B is rotated by a predetermined angle clockwise than the first fan member 30 </ b> A adjacent to the intake port 23 side. The air passage 21 is fixed adjacent to the first fan member 30A. The third fan member 30C is fixedly installed in the air passage 21 adjacent to the second fan member 30B in a state where the third fan member 30C is rotated by a predetermined angle clockwise relative to the second fan member 30B adjacent to the intake port 23 side. ing. Further, the fourth fan member 30D is fixedly installed in the air passage 21 adjacent to the third fan member 30C in a state where the fourth fan member 30D is rotated by a predetermined angle clockwise relative to the third fan member 30C adjacent to the intake port 23 side. ing.

  Therefore, by fixing the first fan member 30A to the fourth fan member 30D in such a state, the first blade portion 31A to the fourth blade portion 31D are shafts of the rotary shaft 20 as shown in FIG. Arranged to draw a spiral according to the direction. As a result, with the rotation of the rotor 10 and the rotating shaft 20, a stronger airflow can be generated in the rotating shaft 20 by the first blade portion 31A to the fourth blade portion 31D.

  As shown in FIG. 1, the stator 40 is fixed inside the motor case 50 and includes a substantially cylindrical stator core 41 and a stator coil wound around the stator core 41. The stator core 41 has a substantially cylindrical shape formed by laminating a plurality of electromagnetic steel plates. The stator core 41 has a plurality of teeth and slots (not shown) that are distributed in the circumferential direction and extend in the axial direction. Each slot is formed between the circumferential directions of the two teeth.

  The stator coil is made of a conductor, and is wound around the teeth through each slot formed in the stator core 41. As described above, since the stator 40 is a stator of an induction motor driven by three-phase alternating current, the stator 40 includes three-phase stator coils of U phase, V phase, and W phase, and is supplied with alternating current of each phase. As a result, a rotating magnetic flux is generated. The stator coils of each phase are wound across a plurality of slots formed in the stator core 41 so as to cover the end face in the axial direction of the stator core 41. Accordingly, the coil end portions 42 are formed on both sides in the axial direction of the stator core 41 so as to protrude from the axial end surface of the stator core 41 as a part of the stator coil in the stator 40.

  The motor case 50 is a case for housing the rotor 10 and the stator 40, and includes a stator fixing portion 51, a front case 52, and a rear case 53 (see FIG. 1). The stator fixing portion 51 is a cylindrical housing located between the front case 52 and the rear case 53. When the stator core 41 is press-fitted into the inner diameter of the cylindrical housing, the motor case 50 is fixed. The stator 40 is fixed at a predetermined position inside.

  The front case 52 constitutes a portion on the front side of the motor case 50 (power transmission part B side), and covers the rotor 10 and the stator 40 on the power transmission part B side. The front case 52 has a bearing 55 on the surface on the power transmission part B side, and the rotary shaft 20 is rotatably supported by the bearing 55.

  The rear case 53 constitutes a portion on the rear side of the motor case 50 (inverter unit I), and covers the rotor 10 and the stator 40 on the inverter unit I side. The rear case 53 has a bearing 55 on the surface on the inverter unit I side, like the front case 52, and the rotary shaft 20 is rotatably supported by the bearing 55.

  Further, the rear case 53 has a plurality of vent holes 53A around the bearing 55, and communicates the inside and the outside of the motor case 50. Therefore, according to the rotating electrical machine 1, as the rotating shaft 20 rotates, the air around the inverter unit I is sucked into the motor case 50, and the power is supplied via the intake port 23, the air passage 21, and the exhaust port 24. It can exhaust to the transmission part B side.

  As described above, the rotating electrical machine 1 according to the first embodiment includes the rotor 10 fixed to the rotating shaft 20 and the stator 40 disposed radially outside the rotor 10 in the motor case 50. The rotor 10 is driven by rotating together with the rotary shaft 20. The rotating shaft 20 has an intake port 23 on the inverter unit I side from the axial end surface of the rotor 10, and an exhaust port 24 on the power transmission unit B side from the axial end surface of the rotor 10. Further, the rotary shaft 20 has a ventilation path 21 that connects the intake port 23 and the exhaust port 24, and the first fan members 30 </ b> A to 30 </ b> A to 30 </ b> A are disposed between the intake port 23 and the exhaust port 24 inside the ventilation path 21. A fourth fan member 30D is provided.

  As the rotor 10 and the rotation shaft 20 rotate, the first fan member 30A to the fourth fan member 30D rotate together with the rotation shaft 20 inside the air passage 21, so that the air passage 21 has an intake port 23 to an exhaust port 24. It can generate an air flow toward As a result, the air on the inverter unit I side from the axial end surface of the rotor 10 is introduced into the air passage 21 through the intake port 23, and the power is increased from the axial end surface of the rotor 10 through the exhaust port 24. Since it can discharge | emit to the transmission part B side, according to the said rotary electric machine 1, the rotary electric machine 1 and its peripheral devices (for example, inverter unit I, power transmission part B) are cooled using the circulation of gas. can do.

  As shown in FIGS. 4 to 6, the first fan member 30 </ b> A to the fourth fan member 30 </ b> D are formed separately from the rotary shaft 20, and the intake port 23 in the air passage 21 Between the exhaust port 24, it is fixed by shrink fitting. As a result, according to the rotating electrical machine 1, the first fan member 30 </ b> A to the fourth fan member 30 </ b> D formed separately are fixed to predetermined positions inside the air passage 21 by shrink-fitting to the rotating shaft 20. Can be realized by a simpler operation.

  Each of the first fan member 30A to the fourth fan member 30D has a first blade portion 31A to a fourth blade portion 31D as a plurality of blade portions 31 for generating an air flow, and the ventilation path 21. Since it is arrange | positioned in the internal predetermined position, the cooling efficiency with respect to the rotary electric machine 1 etc. can be improved more. Furthermore, since the first blade portion 31A to the fourth blade portion 31D are arranged so as to draw a spiral according to the axial direction of the rotary shaft 20, a strong air flow can be generated in the air passage 21, and the rotating electric machine 1 and its peripheral devices can be cooled more efficiently.

  As shown in FIG. 3, the inner wall surface of the air passage 21 is configured as a threaded surface 22, and a screw groove that draws a spiral is formed along the axial direction of the rotary shaft 20. By configuring the inner wall surface of the air passage 21 as the threaded surface 22, the contact area with the airflow passing through the air passage 21 can be increased, so that the cooling efficiency in the rotor 10 can be increased.

  In addition to the end surface of the rotary shaft 20 on the inverter unit I side than the end surface in the axial direction of the rotor 10, the air inlet 23 of the rotary shaft 20 has a plurality of locations on the outer peripheral surface of the rotary shaft 20 positioned on the inverter unit I side. Is open. Here, as shown in FIG. 1 and the like, the coil end portion 42 of the stator 40 is located outside the rotor 10 in the radial direction, and the coil end portion 42 generates heat as the rotating electrical machine 1 is driven. Ambient temperature rises. Therefore, according to the rotating electrical machine 1, the air around the coil end portion 42 that has risen as a result of driving is sucked through the air inlet 23 and is opened at the end face of the rotating shaft 20 on the power transmission portion B side. Via the exhaust port 24, it can exhaust to the exterior of the motor case 50 of the said rotary electric machine 1, and it can cool using gas.

  Moreover, by doing in this way, the refrigerant | coolant which cooled the inverter unit I is used for cooling the rotary electric machine 1, for example, by discharging the warmed refrigerant | coolant to the power transmission part B side, the inverter unit I is made again. It can suppress using for cooling, and a fresh (relatively low temperature) refrigerant | coolant can be used for cooling of the inverter unit I. FIG. That is, in the present embodiment, the refrigerant sucked from one axial direction of the rotating electrical machine 1 is discharged to the other, thereby suppressing the warmed refrigerant from being recirculated as it is. On the other hand, for example, when the refrigerant is discharged to the outer peripheral surface side of the rotating electrical machine 1, there is a high possibility that the warm refrigerant is used again for cooling the inverter unit I.

  As shown in FIG. 3, the rotary shaft 20 is configured by joining the end faces of a plurality of shaft-like members 20A to each other by friction welding, so that each shaft-like member 20A has a variety of units. Work can be done. That is, according to the rotating electrical machine 1, the operation of arranging the fan member 30 at a predetermined position in the air passage 21, the operation of forming the threaded surface 22, and the like can be simplified by working in units of the shaft-like member 20 </ b> A. Can be done.

(Second Embodiment)
Next, an embodiment (second embodiment) different from the above-described first embodiment will be described in detail with reference to FIGS. The rotating electrical machine 1 according to the second embodiment has the same basic configuration as the rotating electrical machine 1 according to the first embodiment, and the configuration of the fan member 30 is different. That is, in the rotating electrical machine 1 according to the second embodiment, the configuration of the rotor 10, the rotating shaft 20, the stator 40, the motor case 50, and the like are the same as those of the first embodiment, Omitted.

  In the rotary electric machine 1 according to the second embodiment, one fan member 30 is fixedly installed at a predetermined position between the air inlet 23 and the air outlet 24 in the air passage 21 of the rotary shaft 20 by shrink fitting. Yes. Similarly to the first fan member 30A to the fourth fan member 30D according to the first embodiment, the fan member 30 according to the second embodiment draws a spiral in the cylindrical member according to the axial direction of the fan member 30 8. It has the blade | wing part 31 of a sheet | seat, By rotating the said fan member 30, the airflow which goes to an axial direction is generated.

  That is, the fan member 30 in the present invention does not have to be provided in a plural number as in the first fan member 30A to the fourth fan member 30D in the first embodiment, and may be a single fan member 30. Further, the plurality of blade portions 31 in the fan member 30 may be four as in the first embodiment, or may be eight as in the second embodiment. The number of blade portions 31 in one fan member 30 can be appropriately set according to the required strength of the airflow.

  As described above, the rotating electrical machine 1 according to the second embodiment is similar to the first embodiment in the rotor 10 fixed to the rotary shaft 20 and the stator disposed radially outside the rotor 10. 40 is housed in the motor case 50 and is driven by rotating the rotor 10 together with the rotary shaft 20. The rotating shaft 20 has an intake port 23 on the inverter unit I side from the axial end surface of the rotor 10, and an exhaust port 24 on the power transmission unit B side from the axial end surface of the rotor 10. Further, the rotary shaft 20 has a ventilation path 21 that communicates the intake port 23 and the exhaust port 24, and a fan member 30 is provided between the intake port 23 and the exhaust port 24 inside the ventilation path 21. ing.

  Due to the rotation of the rotor 10 and the rotating shaft 20, the fan member 30 rotates together with the rotating shaft 20 inside the air passage 21, so that an air flow from the air inlet 23 to the air outlet 24 can be generated inside the air passage 21. As a result, the air on the inverter unit I side from the axial end surface of the rotor 10 is introduced into the air passage 21 through the intake port 23, and the power is increased from the axial end surface of the rotor 10 through the exhaust port 24. Since it can be discharged to the transmission part B side, the rotating electrical machine 1 cools the rotating electrical machine 1 and its peripheral devices (for example, the inverter unit I, the power transmission part B) by using gas circulation. Can do.

  As shown in FIGS. 8 to 10, the fan member 30 is formed separately from the rotary shaft 20, and between the intake port 23 and the exhaust port 24 inside the air passage 21, It is fixed by shrink fitting. Thereby, according to the said rotary electric machine 1, since the fan member 30 formed separately can be fixed to the predetermined position inside the ventilation path 21 by shrink-fitting to the rotating shaft 20, it is easier. Can be realized by work.

  And the fan member 30 has the some blade | wing part 31 for producing airflow, and since each blade | wing part 31 is arrange | positioned so that a spiral may be drawn according to the axial direction of the rotating shaft 20, ventilation is carried out. A strong air current can be generated in the path 21, and the rotating electrical machine 1 and its peripheral devices can be cooled more efficiently.

  Also in the second embodiment, the inner wall surface of the air passage 21 is configured as a threaded surface 22, and a screw groove that draws a spiral in accordance with the axial direction of the rotary shaft 20 is formed. By configuring the inner wall surface of the air passage 21 as the threaded surface 22, the contact area with the airflow passing through the air passage 21 can be increased, so that the cooling efficiency in the rotor 10 can be increased.

  In addition to the end surface of the rotary shaft 20 on the inverter unit I side than the end surface in the axial direction of the rotor 10, the air inlet 23 of the rotary shaft 20 has a plurality of locations on the outer peripheral surface of the rotary shaft 20 positioned on the inverter unit I side. Is open. Therefore, according to the rotating electrical machine 1, as in the first embodiment, the air around the coil end portion 42 that has risen as a result of driving is sucked in via the intake port 23, and the rotating shaft on the power transmission portion B side is sucked. It can exhaust to the exterior of the motor case 50 of the said rotary electric machine 1 through the exhaust port 24 opened by the end surface of 20, and can cool using gas.

  Further, the rotary shaft 20 according to the second embodiment is also configured by joining the end faces of the plurality of shaft-like members 20A to each other by friction welding, so that various operations can be performed for each shaft-like member 20A. Can be done. That is, according to the rotating electrical machine 1, the operation of arranging the fan member 30 at a predetermined position in the air passage 21, the operation of forming the threaded surface 22, and the like can be simplified by working in units of the shaft-like member 20 </ b> A. Can be done.

(Third embodiment)
Subsequently, an embodiment (third embodiment) different from the first embodiment and the second embodiment described above will be described in detail with reference to FIG. The rotating electrical machine 1 according to the third embodiment has the same basic configuration as the rotating electrical machine 1 according to the first embodiment and the second embodiment, and includes a rotating shaft 20, a fan member 30, and an external fan. The structure of the member 60 is different. That is, in the rotating electrical machine 1 according to the third embodiment, the configurations of the rotor 10, the stator 40, and the like are the same as those of the first embodiment and the like, and thus the description regarding these configurations is omitted.

  In the rotating electrical machine 1 according to the third embodiment, the rotating shaft 20 has a ventilation path 21 that extends along the axial direction of the rotating shaft 20 and communicates between the intake port 23 and the exhaust port 24. As shown in FIG. 11, the air inlets 23 in the third embodiment are formed at a plurality of locations on the outer peripheral surface of the rotating shaft 20 on the inverter unit I side, and more than the axial end surface of the rotor 10 on the inverter unit I side. Located on the inverter unit I side. The exhaust port 24 in the third embodiment is formed on the end face of the rotating shaft 20 on the power transmission part B side, and is located on the power transmission part B side with respect to the axial end face of the rotor 10.

  Also in the third embodiment, the fan member 30 is fixed between the air inlet 23 and the air outlet 24 inside the air passage 21, and from the air inlet 23 along with the rotation of the rotary shaft 20 and the like. An air flow toward the exhaust port 24 is generated.

  Here, in the rotating electrical machine 1 according to the third embodiment, the external fan member 60 is fixed to the rotating shaft 20 on the inverter unit I side from the axial end surface of the rotor 10. The external fan member 60 can generate an air flow toward the axial direction of the rotor 10 (the rotor 10 and the stator 40) by rotating together with the rotating shaft 20. Accordingly, the rotating electrical machine 1 can blow the gas introduced from the outside of the motor case 50 through the vent 53A to the coil end portion 42 and the rotor 10 as an air flow generated by the external fan member 60. Thus, the coil end portion 42 of the rotor 10 and the stator 40 can be cooled.

  As described above, the rotating electrical machine 1 according to the third embodiment is similar to the first embodiment and the second embodiment in that the rotor 10 is fixed to the rotary shaft 20 and the radially outer side of the rotor 10. The arranged stator 40 is housed in a motor case 50 and is driven by rotating the rotor 10 together with the rotary shaft 20. The rotating shaft 20 has an intake port 23 on the inverter unit I side from the axial end surface of the rotor 10, and an exhaust port 24 on the power transmission unit B side from the axial end surface of the rotor 10. Further, the rotary shaft 20 has a ventilation path 21 that communicates the intake port 23 and the exhaust port 24, and a fan member 30 is provided between the intake port 23 and the exhaust port 24 inside the ventilation path 21. ing.

  Due to the rotation of the rotor 10 and the rotating shaft 20, the fan member 30 rotates together with the rotating shaft 20 inside the air passage 21, so that an air flow from the air inlet 23 to the air outlet 24 can be generated inside the air passage 21. As a result, the air on the inverter unit I side from the axial end surface of the rotor 10 is introduced into the air passage 21 through the intake port 23, and the power is increased from the axial end surface of the rotor 10 through the exhaust port 24. Since it can be discharged to the transmission part B side, the rotating electrical machine 1 cools the rotating electrical machine 1 and its peripheral devices (for example, the inverter unit I, the power transmission part B) by using gas circulation. Can do.

  As shown in FIG. 11, the fan member 30 is formed separately from the rotary shaft 20, and is shrink-fitted between the intake port 23 and the exhaust port 24 inside the air passage 21. It is fixed. Thereby, according to the said rotary electric machine 1, since the fan member 30 formed separately can be fixed to the predetermined position inside the ventilation path 21 by shrink-fitting to the rotating shaft 20, it is easier. Can be realized by work.

  And the fan member 30 has the several blade | wing part 31 for producing airflow similarly to 1st Embodiment and 2nd Embodiment, and each wing | blade part 31 follows the axial direction of the rotating shaft 20. FIG. Since it is arranged so as to draw a spiral, a strong air flow can be generated in the air passage 21, and the rotating electrical machine 1 and its peripheral devices can be cooled more efficiently.

  Also in the third embodiment, the inner wall surface of the air passage 21 is configured as a threaded surface 22, and a screw groove that draws a spiral is formed along the axial direction of the rotary shaft 20. By configuring the inner wall surface of the air passage 21 as the threaded surface 22, the contact area with the airflow passing through the air passage 21 can be increased, so that the cooling efficiency in the rotor 10 can be increased.

  In the third embodiment, the external fan member 60 is fixed to the rotating shaft 20 on the inverter unit I side from the axial end surface of the rotor 10. The external fan member 60 can generate an air flow in the axial direction of the rotor 10 by rotating together with the rotary shaft 20. Thus, the rotating electrical machine 1 can blow the gas introduced from the outside of the motor case 50 through the vent 53A to the coil end portion 42 as an air flow generated by the external fan member 60. The coil end portion 42 of the stator 40 can be cooled.

  The intake port 23 of the rotating shaft 20 is opened at a plurality of locations on the outer peripheral surface of the rotating shaft 20 on the inverter unit I side from the axial end surface of the rotor 10. Therefore, according to the rotating electrical machine 1, as in the first and second embodiments, the coil end is blown by the air around the coil end portion 42 that has risen with driving or by the external fan member 60. The air that has exchanged heat with the part 42 is sucked in through the air inlet 23, and the motor case of the rotating electrical machine 1 through the exhaust port 24 opened in the end surface of the rotary shaft 20 on the power transmission part B side. 50 can be exhausted to the outside and can be cooled using gas.

  Further, the rotary shaft 20 according to the third embodiment is also configured by joining the end faces of a plurality of shaft-shaped members 20A to each other by friction welding, so that various operations can be performed for each shaft-shaped member 20A. Can be done. That is, according to the rotating electrical machine 1, the operation of arranging the fan member 30 at a predetermined position in the air passage 21, the operation of forming the threaded surface 22, and the like can be simplified by working in units of the shaft-like member 20 </ b> A. Can be done.

Although the present invention has been described based on the embodiments, the present invention is not limited to the above-described embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the rotating electrical machine according to the present invention is applied to a squirrel-cage three-phase induction motor, but is not limited to this aspect, and the present invention is applied to any rotating electrical machine. be able to. Specifically, for example, the present invention can be applied to an IPM motor.
In the above-described embodiment, air (gas) is used as the refrigerant, but a liquid cooling type using water or oil may be used.
Further, although the exhaust port 24 as the discharge port is provided at the end of the rotating shaft 20 on the side of the power transmission unit B, it may be provided on the side of the power transmitting unit B with respect to the axial end surface of the rotor 10. It may be provided on the surface. In that case, a vent hole may be provided in the front case 52 to discharge the refrigerant.

  Further, in the above-described embodiment, the rotating shaft 20 has the intake port 23 on the inverter unit I side with respect to the rotor core 11 and the exhaust port 24 on the power transmission unit B side with respect to the rotor core 11. However, it is not limited to this configuration. That is, the configuration of the rotary shaft 20 may be configured to have the intake port 23 on the power transmission unit B side and the exhaust port 24 on the inverter unit I side.

DESCRIPTION OF SYMBOLS 1 Rotating electrical machine 10 Rotor 20 Rotating shaft 21 Ventilation path 23 Intake port 24 Exhaust port 30 Fan member 30A 1st fan member 30B 2nd fan member 30C 3rd fan member 30D 4th fan member 31 Blade | wing part 40 Stator 42 Coil end part 50 Motor case B Power transmission part I Inverter unit

Claims (5)

A rotor fixed to a rotatable rotation shaft and rotating together with the rotation shaft;
A stator core comprising a stator core disposed radially outside the rotor, a coil wound around the stator core and formed of a conductive wire, and a conductive wire that protrudes in an axial direction from an axial end surface of the stator core and constitutes the coil A stator having a portion,
A rotating electrical machine having a housing that houses the rotor and the stator therein,
The rotation axis is
On one side in the axial direction along the rotation axis, a suction port formed on one side of the axial end surface of the rotor, and on the other side of the axial end surface of the rotor on the other axial side. A refrigerant passage that communicates with the exhaust outlet,
An internal of the refrigerant passage, a a position between the inlet and the outlet, have a plurality of fan members for causing a flow in the refrigerant,
Each of the plurality of fan members has a plurality of blade portions inside a cylindrical member,
Wherein the plurality of fan members, a rotating electrical machine wherein the plurality of vanes of each fan member is characterized Rukoto arranged so as to draw a spiral according to the axial direction of the rotary shaft. The rotating electrical machine according to claim 1,
The fan member is
An internal pre Symbol refrigerant passage, the rotating electrical machine, characterized in that it is fixed by shrink fitting to position between the said inlet and the outlet. The rotating electrical machine according to claim 1 or 2 ,
The refrigerant passage of the rotating shaft is
A rotating electrical machine comprising: a screw groove portion formed by a groove that draws a spiral according to an axial direction of the rotating shaft on an inner wall surface of the refrigerant passage. A rotor fixed to a rotatable rotation shaft and rotating together with the rotation shaft;
A stator core comprising a stator core disposed radially outside the rotor, a coil wound around the stator core and formed of a conductive wire, and a conductive wire that protrudes in an axial direction from an axial end surface of the stator core and constitutes the coil A stator having a portion,
A rotating electrical machine having a housing that houses the rotor and the stator therein,
The rotation axis is
On one side in the axial direction along the rotation axis, Oite on one side than the axial end face of the rotor, a suction port opened in the outer peripheral surface of the rotary shaft, corresponding to the axial direction other side of the rotor A refrigerant passage that is located on the other side in the axial direction than the end surface in the axial direction and communicates with a discharge port opened in the end surface of the rotation shaft on the other side ;
Inside the refrigerant passage, at a position between the suction port and the discharge port, has a fan,
By rotating together with the rotating shaft on the one end side of the rotor in the axial direction and on the one side of the intake port, a flow of refrigerant is generated in the axial direction of the rotor to cool the coil end portion of the stator. An electric rotating machine having an external fan member . The rotating electrical machine according to any one of claims 1 to 4 ,
The rotation axis is
A rotating electrical machine comprising a plurality of shaft-like members having an axial length shorter than that of the rotating shaft, joined by friction welding.

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