JP6221947B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine used as an electric motor or a generator in a vehicle, for example.

  As a conventional rotating electrical machine, a rotor having a rotor core fitted to the outer periphery of a rotating shaft, an end plate provided on at least one axial side of the rotor core, and a stator core disposed in a radial direction facing the rotor And a stator having a stator coil wound around the stator core and formed with a coil end portion that protrudes axially outward from the axial end surface of the stator core, and a cooling device that supplies a cooling liquid to the coil end portion and cools the coil end portion. , Which are generally known.

  And in patent document 1, an end plate (end plate) is equipped with the cooling fluid inflow port for making a cooling fluid flow in, and the several space arranged in parallel by the circumferential direction of the end plate, from a cooling fluid inflow port. A coolant reservoir for storing the coolant that has flowed in, and a coolant jet for ejecting the coolant stored in the space toward the coil end portion of the stator coil. A motor (electric motor) in which a plurality of outlets are arranged in the circumferential direction of the end plate is disclosed.

  In the case of the motor of Patent Document 1, since a plurality of cooling liquid outlets provided in the end plate are arranged in the circumferential direction of the end plate, the amount and the amount of cooling liquid jetted from the cooling liquid outlet The pressure is changed in accordance with the rotation speed of the rotation shaft and the rotor core.

  That is, when the rotational speed is low, the centrifugal force received by the cooling liquid supplied to the cooling liquid reservoir is small, so that the cooling liquid is ejected in a trajectory toward the axially inner side (root side) of the inner peripheral surface of the coil end portion. The On the contrary, when the rotational speed is high, the centrifugal force received by the coolant supplied to the coolant reservoir increases, so the coolant on the track toward the axially outward side (anti-root side) of the inner peripheral surface of the coil end portion. Is ejected. Further, when the amount of the coolant supplied to the coolant reservoir is small, the coolant is ejected on a track toward the axially inner side (root side) of the inner peripheral surface of the coil end portion. On the other hand, when the supply amount of the coolant supplied to the coolant storage part is large, the coolant is ejected along a track toward the axially outward side (anti-root side) of the inner peripheral surface of the coil end part.

  Thereby, according to the motor of patent document 1, regardless of the fluctuation of the operating state of the motor, that is, the rotation speed or the supply amount of the coolant, the coolant is supplied from at least one coolant outlet to the inner peripheral surface of the coil end portion. By being ejected, it is possible to efficiently cool the motor including the stator core.

JP 2009-273285 A

  By the way, the stator core of the rotating electrical machine generates heat because of the iron loss. Further, the stator coil self-heats due to copper loss and receives heat due to iron loss from the stator core. Therefore, the root portion of the stator coil, particularly the coil end portion, is likely to be in a high temperature state.

  However, in the case of the motor disclosed in Patent Document 1, the amount and the pressure of the coolant jetted from the coolant jet are changed in accordance with the rotational speeds of the rotating shaft and the rotor core. For this reason, in the case of Patent Document 1, since the cooling liquid ejection trajectory varies depending on the operating state of the motor, it is difficult to stably eject the cooling liquid to a predetermined target position of the coil end portion.

  The present invention has been made in view of the above circumstances, and provides a rotating electrical machine that can be efficiently cooled by stably ejecting a cooling liquid to a predetermined predetermined portion of a coil end portion. Is a problem to be solved.

The present invention made to solve the above problems
A rotor (20) having a rotor core (21) fitted on the outer periphery of the rotating shaft (15), an annular stator core (31) disposed opposite to the radially outer side of the rotor core, and a winding around the stator core And a stator (30) having a stator coil (36) formed with a coil end portion (37) protruding axially outward from the axial end surface of the stator core, and provided on at least one axial side of the rotor core. In the rotating electrical machine comprising the end plate (40, 40A, 40B, 40C) and the cooling device (50) for supplying the coolant to the coil end portion and cooling it,
The end plate includes a cylindrical outer peripheral wall portion (43) disposed at a position opposed to the inner peripheral surface of the coil end portion in the radial direction, and a coolant that stores the coolant supplied from the cooling device. And a plurality of coolant injection holes (47, 47) provided in the storage portion (45) and for injecting the coolant in the coolant storage portion toward the inner peripheral surface of the coil end portion by centrifugal force. 47a-47c), and
The coolant injection hole is provided so that an injection amount of the coolant with respect to an inner peripheral surface of the coil end portion is different in the axial direction.

  According to the present invention, the end plate sprays the coolant stored in the coolant supplied from the cooling device and the coolant in the coolant storing section toward the inner peripheral surface of the coil end portion by centrifugal force. A plurality of cooling liquid injection holes, and the cooling liquid injection holes are provided such that the amount of cooling liquid injected to the inner peripheral surface of the coil end portion differs in the axial direction. For this reason, the coolant can be intensively and stably ejected to a predetermined location where the coil end portion is likely to be at the highest temperature. Thereby, a coil end part can be cooled efficiently and reliably.

  The reference numerals in parentheses after each member or part described in this column and in the claims indicate the correspondence with specific members and parts described in the embodiments described later, It does not affect the configuration of each claim described in the claims.

FIG. 3 is a schematic cross-sectional view along the axial direction of the rotating electrical machine according to the first embodiment. It is the enlarged view to which the principal part of FIG. 1 was expanded. It is the perspective view seen from the axial direction outer side of the end plate which concerns on Embodiment 1. FIG. 6 is a schematic cross-sectional view along the axial direction of a rotating electrical machine according to Embodiment 2. FIG. It is the enlarged view to which the principal part of FIG. 4 was expanded. It is the perspective view seen from the axial direction outer side of the end plate which concerns on Embodiment 2. FIG. It is the perspective view seen from the axial direction outer side of the end plate which concerns on the modification 1. FIG. It is the perspective view seen from the axial direction outer side of the end plate which concerns on the modification 2. FIG.

  Hereinafter, embodiments of a rotating electrical machine according to the present invention will be specifically described with reference to the drawings.

Embodiment 1
The rotating electrical machine 1 of the present embodiment is used as a vehicle motor, and includes a housing 10, a rotating shaft 15, a rotor 20, a stator core 31, and a stator coil 36 as shown in FIGS. And a pair of end plates 40, 40 and a cooling device 50.

  The housing 10 includes a cylindrical tubular member 11 having both ends opened in the axial direction, and a pair of lid members 12 and 12 fixed so as to seal openings at both ends of the tubular member 11. Discharge ports 13 for discharging a coolant (not shown) supplied from the cooling device 50 to the stator coil 36 to the outside of the housing 10 are provided at lower portions on both axial sides of the cylindrical member 11.

  Both ends of the rotating shaft 15 are rotatably supported by the housing 10 via a pair of bearings 14, 14 provided at the center of the inner surface of the lid members 12, 12. The rotary shaft 15 employs a hollow shaft in which a flow passage 17 through which a coolant supplied from the cooling device 50 flows is formed. An inlet 16 into which the coolant is introduced from the cooling device 50 is provided on one axial end side (left side in FIG. 1) of the rotating shaft 15. In addition, outlets 18 through which the coolant is led out from the flow passage 17 to the coolant reservoir 45 of each end plate 40 are provided at predetermined portions on both sides in the axial direction of the rotary shaft 15.

  An annular rotor 20 is coaxially fitted and fixed to the outer periphery of the central portion in the axial direction of the rotating shaft 15 inside the housing 10. The rotor 20 includes a rotor core 21 formed by laminating a plurality of annular steel plates in the axial direction, and a plurality of permanent magnets (not shown) embedded in the outer peripheral portion of the rotor core 21 at a predetermined distance in the circumferential direction. Have. A plurality of magnetic poles having different polarities alternately in the circumferential direction are formed on the outer peripheral portion of the rotor core 21 by a plurality of permanent magnets. The number of magnetic poles of the rotor 20 is not limited because it varies depending on the rotating electrical machine. In this embodiment, an 8-pole rotor (N pole: 4, S pole: 4) is employed.

  The stator 30 includes a stator core 31 disposed to face the outer side in the radial direction of the rotor core 21, a three-phase (U-phase, V-phase, W-phase) stator coil 36 wound around the stator core 31, and a stator coil 36. And a pair of coil end covers 38, 38 that respectively cover the pair of coil end portions 37, 37 formed at both ends in the axial direction.

  The stator core 31 is formed by laminating a plurality of annular electromagnetic steel plates in the axial direction. The stator core 31 has a plurality of teeth (not shown) that protrude radially inward from the annular back core portion and are arranged at a predetermined distance in the circumferential direction. Between the adjacent teeth, a slot ( (Not shown) is formed. The slots are formed at a ratio of two per one phase of the three-phase stator coil 36 with respect to the number of magnetic poles of the rotor (eight pole pairs). That is, the slots are formed at a rate of two per phase per pole. In this embodiment, since 8 × 3 × 2 = 48, 48 slots are provided at equal intervals in the circumferential direction.

  The stator coil 36 is wound around the stator core 31 by winding a rectangular conductive wire having a rectangular cross-sectional shape and having an outer peripheral surface coated with an insulating film around a slot by a predetermined winding method. At both ends in the axial direction of the stator coil 36, a pair of annular coil end portions 37, 37 are formed by portions of the stator coil 36 projecting axially outward from the axial end surface of the stator core 31.

  Each of the pair of coil end covers 38, 38 is formed in a ring shape having an L-shaped cross section. Each coil end cover 38 is disposed on both axial sides of the stator coil 36 so as to cover the outer peripheral surface and the axially outer end surface of each coil end portion 37.

  On both axial sides of the rotor core 21, cylindrical end plates 40 each having a coolant storage part 45 are provided. As shown in FIG. 3, each end plate 40 includes a ring plate-shaped inner plate 41, a cylindrical inner peripheral wall portion 42 having one axial end connected to an inner peripheral side end portion of the inner plate 41, and an inner side A cylindrical outer peripheral wall 43 having one axial end connected to the outer peripheral end of the plate 41, and a ring-plate outer plate having an outer peripheral end connected to the other axial end of the outer peripheral wall 43. 44.

  The outer plate 44 has a radial width smaller than that of the inner plate 41 by about 1/3, and is spaced apart from the inner peripheral wall portion 42 in the radial direction. Therefore, a ring-shaped space having a width approximately twice as large as the radial width of the outer plate 44 is formed between the inner peripheral end of the outer plate 44 and the inner peripheral wall portion 42. A coolant storing part 45 that stores coolant supplied from the cooling device 50 is formed in the internal space of the end plate 40 defined by the inner plate 41, the outer plate 44, the inner peripheral wall part 42, and the outer peripheral wall part 43. Has been.

  Each end plate 40 has an inner peripheral wall 41 in contact with the axial end surface of the rotor core 21, and an outer peripheral wall portion 43 radially facing the inner peripheral surface of each coil end portion 37 of the stator coil 36. The part 42 is fitted and fixed to the outer periphery of the rotary shaft 15. A communication hole 46 that communicates the introduction port 16 of the rotating shaft 15 and the coolant storing part 45 is provided at two locations that are 180 ° out of phase in the circumferential direction of the inner peripheral wall part 42.

  In addition, a plurality of coolant injections are made on the outer peripheral wall 43 to inject the coolant in the coolant reservoir 45 toward the inner peripheral surface of each coil end portion 37 of the stator coil 36 by centrifugal force when the rotor 20 rotates. Holes 47a to 47c are provided. The coolant injection holes 47a to 47c are arranged in a state in which a plurality of types (three types in this embodiment) having different cross-sectional areas are out of phase with each other in the axial direction. That is, in the case of this embodiment, from the inner side plate 41 side to the outer side plate 44 side, the coolant injection hole 47a having the largest cross-sectional area, the coolant injection hole 47b having the middle cross-sectional area, and the cross-sectional area being the largest. The small coolant injection holes 47c are arranged in this order. These three types of coolant injection holes 47 a to 47 c are arranged in a state of being arranged in a line in the axial direction on a straight line parallel to the central axis of the end plate 40. The three types of coolant injection holes 47 a to 47 c arranged in a line in the axial direction are formed in a total of 12 lines at an angular interval of 30 ° in the circumferential direction of the outer peripheral wall 43.

  Thereby, the injection amount of the coolant injected from the coolant injection holes 47 a to 47 c is made different in the axial direction with respect to the inner peripheral surface of each coil end portion 37. In the present embodiment, it is set so that the largest amount of cooling liquid is jetted to the root portion of the inner peripheral surface of each coil end portion 37. That is, because of the structure of the stator 30 according to the present embodiment, the stator coil 36 self-heats due to copper loss and receives heat due to iron loss from the stator core 31, so that the root portion of each coil end portion 37 of the stator coil 36. Tends to be in a high temperature state. For this reason, the root portion of each coil end portion 37 that is likely to reach the highest temperature is sprayed with the largest amount of coolant so that the root portion is intensively cooled.

  As shown in FIG. 1, the cooling device 50 includes a pump 53 that conveys the coolant to the flow passage 17 of the rotating shaft 15 and a radiator 54 that releases the heat of the heated coolant. The pump 53 and the radiator 54 are connected by a piping for conveying a coolant, and are installed on a circulating circuit for the coolant.

  That is, in the cooling device 50 of the present embodiment, the cooling liquid pumped to the flow passage 17 of the rotating shaft 15 by the pump 53 flows out from the outlet 18 and the communication hole 46 to the cooling liquid reservoir 45. The coolant that has flowed out into the coolant reservoir 45 is sprayed from the coolant spray holes 47 a to 47 c toward the inner peripheral surface of each coil end portion 37 by the centrifugal force when the rotor 20 rotates, and each coil end portion 37. Fall while cooling. The dropped cooling liquid is returned to the pump 53 from the discharge port 13 provided at the bottom of the housing 10, is cooled to a low temperature from the pump 53 via the radiator 54, and then pumped again to the flow passage 17 of the rotating shaft 15. Thus, a circulation circuit is formed. In this embodiment, ATF is used as the coolant, but a known coolant used in a conventional rotating electric machine may be used.

  Next, the operation of the rotating electrical machine 1 of the present embodiment configured as described above will be described. The rotating electrical machine 1 according to the present embodiment is installed at a predetermined position of the vehicle such that the rotating shaft 15 faces in the horizontal direction and the discharge port 13 of the housing 10 is positioned at the lowermost portion in a normal use state. When the operation is started by energizing the stator coil 36 of the stator 30, the rotating shaft 15 rotates with the rotation of the rotor 20, and driving force is supplied from the rotating shaft 15 to other devices.

  At the same time, the pump 53 and the radiator 54 of the cooling device 50 start to operate, and the low-temperature coolant flows from the inlet 16 of the rotating shaft 15 to the flow passage 17 as shown in FIGS. Then, the liquid flows out from the outlet 18 and the communication hole 46 to the coolant reservoir 45. The coolant that has flowed out into the coolant reservoir 45 is jetted from the coolant jet holes 47 a to 47 c toward the inner peripheral surface of each coil end portion 37 by the centrifugal force of the rotating rotor 20.

  At this time, in the present embodiment, the injection amount of the coolant injected from the coolant injection holes 47a to 47c is made different in the axial direction, and the root of each coil end portion 37 that is likely to be the highest temperature in the axial direction. The most coolant is intensively injected into the section. As a result, the cooling liquid is stably ejected to the intended predetermined location of each coil end portion 37, so that each coil end portion 37 is efficiently and reliably cooled.

  In the present embodiment, a pair of coil end covers 38 are provided on both sides of the stator coil 36 in the axial direction so as to cover the outer peripheral surface and the axially outer end surface of each coil end portion 37. Therefore, the coolant injected toward the inner peripheral surface of each coil end portion 37 stays in the vicinity of each coil end portion 37 by each coil end cover 38 without passing through each coil end portion 37 in a short time. To do. Thereby, each coil end part 37 is cooled efficiently and reliably.

  Thereafter, the coolant that is sprayed on each coil end portion 37 to cool each coil end portion 37 overflows from each coil end cover 38 and falls to the bottom of the housing 10. The dropped coolant is returned to the pump 53 from the discharge port 13 provided at the bottom of the housing 10, is cooled to a low temperature from the pump 53 via the radiator 54, and then flows again from the introduction port 16 of the rotating shaft 15. It is pumped to the passage 17 and circulates through the circulation circuit to repeatedly cool the entire stator 30.

  As described above, according to the rotating electrical machine 1 of the present embodiment, each end plate 40 includes the cooling liquid reservoir 45 and the plurality of cooling liquid injection holes 47a to 47c configured as described above. The liquid injection holes 47a to 47c are provided such that the injection amount of the coolant with respect to the inner peripheral surface of each coil end portion 37 is different in the axial direction. In other words, in the case of the present embodiment, the largest amount of coolant is preferentially injected to the root portion of each coil end portion 37 that tends to be the highest temperature in the axial direction. For this reason, the coolant can be intensively and stably ejected to a predetermined predetermined location of each coil end portion 37, so that each coil end portion 37 can be efficiently and reliably cooled.

  In the present embodiment, each end plate 40 has a cylindrical outer peripheral wall 43 disposed at a position facing the inner peripheral surface of each coil end portion 37 in the radial direction. Coolant injection holes 47a to 47c are provided. Therefore, the coolant injection holes 47a to 47c can be appropriately and easily provided such that the coolant injection amount with respect to the inner peripheral surface of each coil end portion 37 is different in the axial direction.

  Further, in the present embodiment, since a plurality of types of coolant injection holes 47a to 47c having different cross-sectional areas are arranged in the axial direction on the outer peripheral wall 43 of each end plate 40, each coil end portion Thus, the coolant can be intensively and stably ejected to a predetermined location where the temperature tends to be the highest at 37.

  Further, the rotating electrical machine 1 of the present embodiment includes a pair of coil end covers 38 that cover the outer peripheral surface and the axially outer end surface of each coil end portion 37. Therefore, the coolant sprayed from the coolant spray holes 47 a to 47 c toward the inner peripheral surface of each coil end portion 37 can be retained in the vicinity of each coil end portion 37 by the coil end cover 38. Thereby, each coil end part 37 can be cooled efficiently and reliably.

  Moreover, in this embodiment, the rotating shaft 15 is formed in a hollow shape, and the inlet 16 into which the coolant is introduced from the cooling device 50, and the flow passage 17 through which the coolant introduced from the inlet 16 flows. In addition, an outlet having an outlet 18 for leading the coolant from the flow passage 17 to the coolant reservoir 45 is employed. Thereby, the circulation circuit of the coolant supplied from the cooling device 50 to the coolant storage unit 45 can be easily configured using the rotary shaft 15.

[Embodiment 2]
A rotating electrical machine 2 according to Embodiment 2 will be described with reference to FIGS. In the rotating electrical machine 1 of the first embodiment, the inlet 16 and the flow passage 17 for the coolant introduced from the cooling device 50 are provided in the rotating shaft 15, whereas in the rotating electrical machine 2 of the second embodiment, the inlet is introduced. The difference is that the port 16A and the flow passage 17A are provided in the housing 10A. Therefore, the detailed description about the member and structure which are common in Embodiment 1 is abbreviate | omitted, and demonstrates below centering on a different point and an important point. In addition, the same code | symbol is used for the member and site | part which are common in Embodiment 1. FIG.

  4 to 6, the rotating electrical machine 2 according to the second embodiment includes a housing 10A, a rotating shaft 15A, a rotor 20, a stator 30 having a stator core 31 and a stator coil 36, a pair of end plates 40A, 40A and a cooling device 50 are provided. The rotating shaft 15A according to the second embodiment is a solid one and is different from the rotating shaft 15 according to the first embodiment in that the inlet 16, the flow passage 17, and the outlet 18 are not provided.

  The housing 10A of the second embodiment accommodates the rotor 20, the stator 30, and the like configured in the same manner as in the first embodiment. The housing 10A includes a cylindrical tubular member 11A having both ends opened in the axial direction, and lid members 12A and 12A fixed so as to seal openings at both ends of the tubular member 11A. The housing 10A includes an introduction port 16A through which cooling liquid is introduced from the cooling device 50, a flow passage 17A through which the cooling liquid introduced from the introduction port 16A flows, and cooling of each end plate 40A from the flow passage 17A. A pair of nozzles 18 </ b> A and 18 </ b> A for supplying a coolant to the liquid storage unit 45.

  The introduction port 16A is provided at the outer peripheral side end portion that opens at the axially outer end surface of one (right side in FIG. 4) lid member 12A. The introduction port 16A is provided at a lower position when the rotary electric machine 2 is installed in the vehicle so that the rotary shaft 15A faces the horizontal direction.

  Then, the flow passage 17A extends from the introduction port 16A in the cylindrical member 11A in the axial direction and reaches the other lid member 12A, and then bends substantially at right angles to the rotating shaft 15A side so as to be inside the other lid member 12A. Extending radially inward, and then bent substantially perpendicularly to the axially inward side. A nozzle 18A is arranged at the tip outlet on the inner side in the axial direction of the flow passage 17A so that the tip enters the coolant reservoir 45 of one end plate 40A.

  The one lid member 12A extends slightly from the introduction port 16A in the axial direction, and then bends substantially perpendicularly to the rotating shaft 15A side so as to extend inside the one lid member 12A toward the radially inward side. Thereafter, a flow passage 17A is provided that is bent at a substantially right angle inward in the axial direction and extends inward in the axial direction. The nozzle 18A is also disposed at the tip outlet on the inner side in the axial direction of the flow passage 17A so that the tip enters the coolant storage part 45 of the other end plate 40A.

  The discharge ports 13A and 13A provided at the lower portions on both axial sides of the cylindrical member 11A have a phase in the circumferential direction with respect to the flow passage 17A extending in the axial direction from the introduction port 16A to the inside of the cylindrical member 11A. It is provided at a shifted position. Therefore, the rotary electric machine 2 of Embodiment 2 is installed in a vehicle so that the discharge ports 13A and 13A are located at the lowermost part.

  Moreover, each end plate 40A of Embodiment 2 is provided with the inner side board 41, the inner peripheral wall part 42, the outer peripheral wall part 43, the outer side board 44, and the cooling fluid storage part 45, as shown in FIG. A plurality of coolant injection holes 47 a to 47 c are provided in the outer peripheral wall portion 43 as in the first embodiment. However, each end plate 40A of the second embodiment is different from each end plate 40 of the first embodiment in that the communication hole 46 provided in the inner peripheral wall portion 42 of each end plate 40 of the first embodiment is not provided. Different.

  In addition, since the cooling device 50 of Embodiment 2 is the same as the cooling device 50 of Embodiment 1, detailed description is abbreviate | omitted.

  As in the case of the first embodiment, the rotating electrical machine 2 of the second embodiment configured as described above starts operation by energization of the stator coil 36, and at the same time, the pump 53 and the radiator 54 of the cooling device 50. Starts operating. As a result, as shown in FIGS. 4 and 5, the cooled coolant is pumped from the inlet 16A of the housing 10A to the flow passage 17A and then supplied from the nozzle 18A to the coolant reservoir 45. The coolant stored in the coolant storage part 45 is injected toward the inner peripheral surface of each coil end part 37 from the coolant injection holes 47 a to 47 c by the centrifugal force of the rotating rotor 20.

  At this time, also in the case of the second embodiment, since the injection amount of the coolant injected from the coolant injection holes 47a to 47c is made different in the axial direction, each coil end that is likely to become the highest temperature in the axial direction. The most coolant is preferentially injected into the root of the portion 37. As a result, the cooling liquid is stably ejected to the intended predetermined location of each coil end portion 37, so that each coil end portion 37 is efficiently and reliably cooled.

  Also in the case of the second embodiment, a pair of coil end covers 38 and 38 are provided on both sides in the axial direction of the stator coil 36 so as to cover the outer peripheral surface and the axially outer end surface of each coil end portion 37. Yes. Therefore, the coolant sprayed toward the inner peripheral surface of each coil end portion 37 stays in the vicinity of each coil end portion 37 by each coil end cover 38, so that each coil end portion 37 is efficiently and reliably provided. To be cooled.

  As described above, according to the rotating electrical machine 2 of the second embodiment, each end plate 40A includes the coolant reservoir 45 configured as described above and the plurality of coolant spray holes 47a to 47c. The liquid injection holes 47a to 47c are provided such that the injection amount of the coolant with respect to the inner peripheral surface of each coil end portion 37 is different in the axial direction. Therefore, also in the case of the second embodiment, the coolant can be ejected intensively and stably to a predetermined predetermined position of each coil end portion 37, so that each coil end portion 37 can be efficiently and reliably provided. The same operations and effects as in the case of the first embodiment are obtained, such as being able to be cooled.

  In particular, in the second embodiment, the housing 16A is provided with the inlet 16A and the flow passage 17A through which the coolant is introduced from the cooling device 50, so that the coolant supplied from the cooling device 50 to the coolant reservoir 45 The circulation circuit can be easily configured using the housing 10A.

[Modification 1]
The end plate 40B of Modification 1 shown in FIG. 7 is similar to the end plate 40 of Embodiment 1 in that the inner plate 41, the inner peripheral wall portion 42, the outer peripheral wall portion 43, the outer plate 44, and the coolant storing portion. 45. In the outer peripheral wall 43 of the end plate 40B, as in the first embodiment, three types of coolant injection holes 47a to 47c having different cross-sectional areas are arranged in a state in which phases are shifted in the axial direction.

  In the case of the first modification, as in the first embodiment, the coolant injection hole 47a having the largest cross-sectional view, the coolant injection hole 47b having the middle cross-sectional area, and the coolant injection hole 47c having the smallest cross-sectional area. Are arranged in order from the inner side plate 41 side to the outer side plate 44 side. And in the case of the modification 1, the coolant injection holes 47a-47c from which a cross-sectional area differs are arrange | positioned in the state which mutually shifted the phase in the circumferential direction.

  That is, in the first embodiment, the three types of coolant injection holes 47a to 47c having different cross-sectional areas are arranged in a line in the axial direction on a straight line parallel to the central axis of the end plate 40. On the other hand, the first modification differs from the first embodiment in that the three types of coolant injection holes 47a to 47c having different cross-sectional areas are arranged in a state in which phases are shifted in the circumferential direction.

  The end plate 40B of the first modification shown in FIG. 7 configured as described above is used for the rotating electrical machine 1 of the first embodiment, and when this end plate 40B is used for the rotating electrical machine 2 of the second embodiment. The communication hole 46 provided in the inner peripheral wall portion 42 may be removed.

[Modification 2]
As in the end plate 40B of the first modification, the end plate 40C of the second modification shown in FIG. 8 includes an inner plate 41, an inner peripheral wall portion 42, an outer peripheral wall portion 43, an outer plate 44, and a coolant storing portion. 45. And the coolant injection hole 47 with the same cross-sectional area is arrange | positioned in the outer peripheral wall part 43 of 40 C of end plates at the several places (three places in the modification 2) of an axial direction, and a coolant is in each axial arrangement place. The number of injection holes 47 arranged in the circumferential direction is different.

  That is, a total of twelve coolant injection holes 47 are arranged at an angular interval of 30 ° in the circumferential direction of the outer peripheral wall 43 at the arrangement location on the inner plate 41 side in the axial direction. In addition, a total of six coolant injection holes 47 are arranged at an angular interval of 60 ° in the circumferential direction of the outer peripheral wall portion 43 at the arrangement position of the central portion in the axial direction. In addition, a total of four coolant injection holes 47 are arranged at an angular interval of 90 ° in the circumferential direction of the outer peripheral wall 43 at the arrangement location on the outer plate 44 side in the axial direction.

  The end plate 40C of the modified example 2 shown in FIG. 8 configured as described above is used for the rotating electrical machine 1 of the first embodiment, and when this end plate 40C is used for the rotating electrical machine 2 of the second embodiment. The communication hole 46 provided in the inner peripheral wall portion 42 may be removed.

[Other Embodiments]
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in Embodiments 1 and 2 described above, the most coolant is preferentially injected into the root portion of the inner peripheral surface of each coil end portion 37. However, the specifications of the stator core 31 and the stator coil 36 are used. When the highest temperature portion differs in the axial direction due to the difference in structure or the like, it is possible to change so that the largest amount of the coolant is preferentially injected to the highest temperature portion. When changing in this way, as in Embodiments 1 and 2 and Modifications 1 and 2, the size and arrangement of the cross-sectional areas of the coolant injection holes 47 and 47a to 47c provided in the end plates 40 and 40A to 40C. What is necessary is just to change the number suitably and to make the injection quantity of the cooling fluid with respect to the internal peripheral surface of the coil end part 37 differ in an axial direction.

  In the first and second embodiments, the end plates 40 and 40A are provided on both axial sides of the rotor core 21, respectively. However, depending on the specifications and structure of the rotating electrical machine, the end plates 40 and 40A are provided on one axial side of the rotor core 21. Only the end plates 40 and 40A may be provided.

  In the above embodiment, an example in which the rotating electrical machine according to the present invention is applied to a vehicle motor (electric motor) has been described. However, the present invention is not limited to a generator or an electric motor as a rotating electrical machine mounted on a vehicle. The present invention can also be applied to a rotating electrical machine that can selectively use both.

DESCRIPTION OF SYMBOLS 1, 2 ... Rotating electrical machinery 10, 10A ... Housing 15, 15A ... Rotating shaft 16, 16A ... Inlet port, 17, 17A ... Flow path, 18 ... Outlet port, 18A ... Nozzle, 20 ... Rotor, 21 ... Rotor core 30 ... Stator, 31 ... Stator core, 36 ... Stator coil, 37 ... Coil end cover, 38 ... Coil end cover, 40, 40A, 40B, 40C ... End plate, 43 ... Outer wall, 45 ... Coolant storage part, 47, 47a-47c ... coolant injection holes,
50 ... Cooling device.

Claims (7)

A rotor (20) having a rotor core (21) fitted on the outer periphery of the rotating shaft (15), an annular stator core (31) disposed opposite to the radially outer side of the rotor core, and a winding around the stator core And a stator (30) having a stator coil (36) formed with a coil end portion (37) protruding axially outward from the axial end surface of the stator core, and provided on at least one axial side of the rotor core. In the rotating electrical machine comprising the end plate (40, 40A, 40B, 40C) and the cooling device (50) for supplying the coolant to the coil end portion and cooling it,
The end plate includes a cylindrical outer peripheral wall portion (43) disposed at a position opposed to the inner peripheral surface of the coil end portion in the radial direction, and a coolant that stores the coolant supplied from the cooling device. And a plurality of coolant injection holes (47, 47 ) provided in the storage portion (45) and for injecting the coolant in the coolant storage portion toward the inner peripheral surface of the coil end portion by centrifugal force. 47a-47c), and
The rotating electric machine is characterized in that the cooling liquid injection hole is provided so that an injection amount of the cooling liquid with respect to an inner peripheral surface of the coil end portion is different in an axial direction . 2. The rotating electrical machine according to claim 1 , wherein a plurality of types of coolant injection holes having different cross-sectional areas are arranged in a state in which phases are shifted in an axial direction. The rotating electrical machine according to claim 2 , wherein the coolant injection holes having different cross-sectional areas are arranged in a state in which phases are shifted from each other in the circumferential direction. Claim wherein the cooling fluid spray nozzles are those cross-sectional area of the same are arranged in a plurality of locations in the axial direction, characterized in the that the circumferential direction of the arrangement number of the cooling fluid spray nozzles are different in each arrangement position in the axial direction The rotating electrical machine according to 1 . The rotating electrical machine according to any one of claims 1 to 4 , further comprising a coil end cover (38) that covers an outer peripheral surface and an axially outer end surface of the coil end portion. The rotating shaft is formed in a hollow shape, an inlet (16) through which the coolant is introduced from the cooling device, a flow passage (17) through which the coolant introduced from the inlet is circulated, The rotating electrical machine according to any one of claims 1 to 5 , further comprising a lead-out port (18) through which the coolant is led from the flow path to the coolant reservoir. A housing (10A) for accommodating the rotor and the stator therein;
The housing includes an introduction port (16A) through which the cooling liquid is introduced from the cooling device, a flow passage (17A) through which the cooling liquid introduced from the introduction port flows, and the cooling liquid storage from the flow passage. 6. The rotating electrical machine according to claim 1 , further comprising a nozzle (18 </ b> A) that supplies the cooling liquid to a section.

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