JP2013132151A - Rotary electric machine and rotary electric machine cooling system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively inhibit the damage of a stator coil end with a simple structure while ensuring the cooling performance of the stator coil end in a rotary electric machine.SOLUTION: A rotary electric machine 10 includes: a rotor shaft 18 including a shaft side coolant passage 19 where an oil circulates; a rotor 16 fixed to the outer diameter side of the rotor shaft 18; and a stator 14. The rotor 16 includes: a rotor core 40; and an end plate 20 placed adjacent to the rotor core 40 in the axial direction. The end plate 20 includes a plate side coolant passage 46 formed so as to communicate with the shaft side coolant passage 19, and the plate side coolant passage 46 includes a high surface roughness portion 54 provided on an inner wall surface and lowering the density of a coolant discharged from a discharge port 50.

Description

  The present invention relates to a rotating electrical machine including a rotor shaft including a shaft-side refrigerant passage through which a refrigerant flows, a rotor that is provided on the outer diameter side of the rotor shaft and that rotates during use, and a stator that faces the outer diameter side of the rotor, and Regarding the rotating electrical machine cooling system, the rotating electrical machine cooling system is used, for example, for cooling a stator coil end protruding from a stator core.

  2. Description of the Related Art Conventionally known rotating electrical machines such as vehicle electric motors include a stator and a rotor. Further, in such a rotating electric machine, the stator coil provided in the stator generates heat when energized, and the performance deteriorates when the temperature rises excessively. Therefore, coolant (for example, cooling oil) or the like is placed in the oil passage inside the rotor shaft. It is considered that a so-called axial cooling structure is used in which the stator coil is cooled by a refrigerant blown off by centrifugal force.

  For example, in the rotating electrical machine described in Patent Document 1, a shaft hollow portion serving as a refrigerant supply path formed on a rotating shaft that is a rotor shaft to which a rotor is fixed, a pair of end plates provided on both sides of the rotor core, The end plate includes a refrigerant guide path and a branch path formed so as to communicate with the shaft hollow portion. A plurality of refrigerant guide paths are formed from the radially inner end of the end plate toward the radially outer side, and each has a first discharge port that opens to the axially outer end surface at the outer periphery of the end plate. The branch path is a second position formed at a position radially inward of the first discharge port, branched from the guide path, and formed at a position radially inward from the first discharge port at the end face of the end plate. It is open to the outside through the discharge port.

  With such a rotating electric machine, the cooling oil supplied to the shaft hollow portion is scattered from the first discharge port by the centrifugal force based on the rotation of the rotor and supplied to the coil end of the stator to cool the coil. Yes. Further, the cooling oil that exceeds the discharge limit of the first discharge port, the excess cooling oil staying in the guide path is smoothly discharged from the second discharge port of the branch path, and the coil end is caused by the collision of an excessive amount of refrigerant. It is said that the aggression against can be reduced.

  In Patent Document 2, the oil supplied to the in-shaft oil passage in the rotor shaft is supplied from one end plate to the other end plate through the in-core oil passage in the rotor core, and provided on the other end plate. It is described that the refrigerant is ejected from the refrigerant outlet through the return oil passage. The return oil passage causes the opening on the rotor core side and the radially inner end to communicate with each other in the other end plate. The refrigerant outlet communicates with the radially inner end of the refrigerant return path, and ejects the refrigerant from the rotor toward the coil end on the outer surface of the other end plate. The rotation radius of the refrigerant outlet is smaller than the rotation radius of the oil passage in the core.

  Patent Document 3 discloses that the coolant flows from the oil passage of the rotor shaft to the oil passage of the one end plate, the axial oil passage in the rotor core, and the oil passage of the other end plate to the coil end of the stator. Spraying is described. In Patent Document 4, the coolant is supplied to the oil passage of the rotor shaft, and the coolant is supplied to the stator coil end from the rotor shaft oil passage through a hole at a position outside the rotor coil end in the axial direction of the rotor shaft. It is described to blow away.

JP 2010-45894 A JP 2010-239799 A Japanese Patent Laid-Open No. 9-182374 JP 2001-95205 A

  When the stator coil end is cooled by the shaft center cooling structure as in the configurations described in Patent Literature 1 to Patent Literature 4 above, the stator coil end can be cooled with a simple configuration while ensuring the cooling performance of the stator coil end. There is room for improvement in terms of effectively suppressing damage. For example, in the configuration described in Patent Document 1, it is necessary to form a branch path and a plurality of discharge ports in the end plate, and the cooling passage structure formed for flowing the coolant through the end plate becomes complicated. For this reason, the cost of the rotating electrical machine cooling structure may increase.

  Further, in the case of the configurations described in Patent Document 2 to Patent Document 4, there is a possibility that the refrigerant can be discharged toward the stator coil end through holes formed in the end plate or the rotor shaft when the rotor rotates. As the rotation speed increases, the centrifugal force acting on the refrigerant increases, and the refrigerant may collide with the stator coil end at a high speed. For this reason, there is room for improvement in terms of effectively suppressing damage to the stator coil end, such as damage to the insulating coating on the stator coil end.

  An object of the present invention is to effectively suppress damage to a stator coil end with a simple configuration while ensuring cooling performance of the stator coil end in a rotating electrical machine and a rotating electrical machine cooling system.

  A rotating electrical machine according to the present invention includes a rotor shaft including a shaft-side refrigerant passage through which a refrigerant flows, a rotor that is provided on an outer diameter side of the rotor shaft, and that rotates during use, and is opposed to an outer diameter side of the rotor, A stator in which a stator coil end protrudes from an end portion of the stator core, and the rotor includes a rotor core and an end plate arranged adjacent to the axial direction of the rotor core, and the end plate includes the shaft-side refrigerant passage. A plate-side refrigerant passage formed so as to communicate with the plate-side refrigerant passage, and an end portion of the plate-side refrigerant passage that discharges the refrigerant flowing through the plate-side refrigerant passage toward the stator coil end by a centrifugal force when the rotor rotates. The plate-side refrigerant passage is provided on an inner wall surface, and has a high surface roughness that reduces a density of the refrigerant discharged from the discharge port. A rotary electric machine which comprises a moiety.

  According to the above rotary electric machine, the discharge pressure of the refrigerant can be reduced with a simple configuration even when the rotational speed of the rotor is increased, and damage to the stator coil end caused by the collision of the refrigerant with the stator coil end is effective. Can be suppressed.

  In the rotating electrical machine according to the present invention, it is preferable that the high surface roughness portion is a roughened portion provided on an inner wall surface of the plate-side refrigerant passage.

  In the rotating electrical machine according to the present invention, preferably, the high surface roughness portion is a rough material surface portion that is provided on an inner wall surface of the plate-side refrigerant passage and is not subjected to machining as a cast rough material. .

  The rotating electrical machine according to the present invention preferably includes an air introduction hole provided in the end plate and connected to the high surface roughness portion.

  According to the above configuration, the air flowing through the high surface roughness portion is mixed with air from the air introduction hole, so that the discharge pressure of the refrigerant is further reduced, and damage to the stator coil end can be more effectively suppressed.

  The rotating electrical machine cooling system according to the present invention is a rotating electrical machine cooling system including the rotating electrical machine according to the present invention and a refrigerant supply unit that supplies the refrigerant to the shaft-side refrigerant passage.

  According to the rotating electrical machine and the rotating electrical machine cooling system according to the present invention, damage to the stator coil end can be effectively suppressed with a simple configuration while ensuring the cooling performance of the stator coil end.

It is a schematic sectional drawing of the rotary electric machine cooling system containing the rotary electric machine of 1st Embodiment which concerns on this invention. It is the figure which took out the end plate from FIG. 1 and was seen from the axial direction outer side to the inner side. It is AA sectional drawing of FIG. 2 which shows the high surface roughness part of the plate side refrigerant path formed in the end plate. It is a figure corresponding to FIG. 3 which shows another example of a high surface roughness part. FIG. 2 is an enlarged view corresponding to a portion B in FIG. 1, showing a state in which refrigerant is discharged from a discharge port toward a stator coil end when the rotor rotates. It is the figure which looked at the end plate which comprises the rotary electric machine of 2nd Embodiment which concerns on this invention from the axial direction outer side to the inner side. It is the C section enlarged view of FIG. FIG. 7 is a DD cross-sectional enlarged view of FIG. 6 showing a state in which an end plate is fixed to the rotor shaft. It is a figure corresponding to FIG. 8 which shows a mode that a refrigerant | coolant is discharged from a discharge outlet at the time of rotor rotation.

[First Embodiment]
Hereinafter, a first embodiment according to the present invention will be described with reference to FIGS. The rotating electrical machine of the present embodiment is, for example, a hybrid vehicle equipped with an engine and a traveling motor as a vehicle drive source, a motor for driving an electric vehicle such as an electric vehicle, or a generator for generating power, or , And used as a motor generator having both functions. As shown in FIG. 1, the rotating electrical machine 10 includes a stator 14 that is fixed to the inside of the case 12, a rotor 16 that is opposed to the inside of the stator 14 in the radial direction, and a rotor shaft 18. That is, the stator 14 faces the outer diameter side of the rotor 16. Such a rotating electrical machine 10 is a refrigerant, supplies oil that is a coolant to shaft side refrigerant passages 19 provided on the rotor shaft 18, and discharge ports of end plates 20 provided on both sides in the axial direction of the rotor 16. The stator coil end is cooled by discharging oil from the stator.

  That is, the stator 14 is provided at a plurality of locations in the circumferential direction of a laminated body constituted by laminating a plurality of electromagnetic steel plates, a stator core 22 formed of a magnetic material such as a dust core, and an inner peripheral surface of the stator core 22. And a stator coil 24 wound around the formed teeth. In the stator coil 24, a coil end 26, which is a pair of stator coil ends, protrudes outward from both side surfaces in the axial direction that are end portions of the stator core 22.

  The case 12 accommodates the stator 14 and the rotor 16. The rotor shaft 18 is rotatably supported inside the case 12, and a pump shaft 28 connected to the oil pump 60 is supported inside the rotor shaft 18 so as to be relatively rotatable. The pump shaft 28 has an axial refrigerant passage 30 into which oil is introduced, and a radial refrigerant passage 32 that is radially connected to the inner end of the axial refrigerant passage 30. The radially outer end of the radial refrigerant passage 32 opens to the outer peripheral surface of the pump shaft 28.

  A cylindrical gap is formed between the inner peripheral surface of the rotor shaft 18 and the outer peripheral surface of the pump shaft 28, and a second axial refrigerant passage 34 communicating with the radial refrigerant passage 32 is formed by this gap. Yes. In addition, one-side second refrigerant passage 36 and other-side second refrigerant passage 38 are respectively formed at a plurality of circumferential locations on both axial sides of the rotor shaft 18. The radially outer ends of the one-side second refrigerant passage 36 and the other-side second refrigerant passage 38 open to the outer peripheral surface of the rotor shaft 18. In the illustrated example, the one-side second refrigerant passage 36 is formed in the radial direction of the rotor shaft 18, and the other-side second refrigerant passage 38 is formed in the rotor shaft 18 in a direction inclined with respect to the radial direction. However, the second refrigerant passages 36 and 38 are not limited to such shapes, and various shapes can be adopted. For example, the second refrigerant passages 36 and 38 can be formed in the rotor shaft 18 in the radial direction, and the second refrigerant passages 36 and 38 can be formed in the rotor shaft 18 in a direction inclined with respect to the radial direction. it can. The second axial refrigerant passage 34, the one-side second refrigerant passage 36, and the other-side second refrigerant passage 38 form an axial refrigerant passage 19 through which oil flows. The rotor shaft 18 includes the shaft side refrigerant passage 19.

  The rotor 16 is provided on the outer diameter side of the rotor shaft 18 and is rotated during use. The rotor core 40 is fixed to the outer diameter side of the rotor shaft 18 and is permanently embedded in a plurality of locations in the circumferential direction of the rotor core 40. It includes a magnet 42 and a pair of end plates 20 made of a non-magnetic material that are arranged adjacent to both sides of the rotor core 40 in the axial direction and fixed to the rotor shaft 18. Each permanent magnet 42 is magnetized in the radial direction of the rotor 16 or in a direction inclined with respect to the radial direction.

  As shown in FIGS. 2 and 3, each end plate 20 includes a through hole 44 formed in the center in the axial direction, and an outer side in the axial direction of each end plate 20 (the “outside in the axial direction” is opposite to the rotor core). Conversely, the side facing the rotor core is referred to as the inner side, which is the same throughout the present specification.) The plate side is formed at a plurality of circumferential locations (four locations in the example shown in the figure) and the refrigerant flows inside. A refrigerant passage 46 is included. Each plate-side refrigerant passage 46 is formed in a substantially radial shape at a plurality of equally spaced intervals in the radially inner portion of the end plate 20. The radially inner end of each plate-side refrigerant passage 46 reaches the inner peripheral surface of the through-hole 44, and an inclined surface 48 is formed at the radially outer end so as to become radially outward as it goes outward in the axial direction. ing. Further, the axially outer end opening of each plate-side refrigerant passage 46 is a discharge port 50.

  As shown in FIG. 5, when the rotating electrical machine 10 is used, a substantially ring-shaped holding member 52 is fixed to the outside of the rotor shaft 18 so as to be adjacent to the outside in the axial direction of each end plate 20. Further, the rotor shaft 18 is configured such that the radially inner end portion of each plate-side coolant passage 46 communicates with the radially outer end opening of the corresponding second coolant passages 36 and 38 of the rotor shaft 18 (see FIG. 1 for 36). The end plate 20 is disposed outside the front end. For this reason, during use, the radially outer end portion that is not blocked by the restraining member 52 in the axially outer end opening of each plate-side refrigerant passage 46 becomes the discharge port 50. Each plate-side refrigerant passage 46 is formed so as to communicate with the shaft-side refrigerant passage 19. For this reason, each end plate 20 is provided at the end of each plate-side refrigerant passage 46, and has a discharge port 50 that discharges oil flowing through the plate-side refrigerant passage 46 toward the coil end 26 by the centrifugal force when the rotor rotates. Contains. Note that the holding member 52 shown in FIG. 5 can be omitted.

  In particular, each plate-side refrigerant passage 46 includes a high surface roughness portion 54 provided on a part or all of the inner wall surface. As shown in FIG. 3, the high surface roughness portion 54 reduces the density of oil discharged from the discharge port 50 by the passage of the high surface roughness portion 54 as shown in FIG. 5. For example, in the example shown in FIG. 3, each end plate 20 is formed by casting, and at least a part or all of the inner wall surface of each plate-side refrigerant passage 46 is not subjected to machining with a cast coarse material after casting. By using the rough material surface portion, the high surface roughness portion 54 is formed.

  FIG. 4 is a diagram corresponding to FIG. 3 and showing another example of the high surface roughness portion. As in another example shown in FIG. 4, the high-surface roughness portion 54 can also be formed by a concavo-convex processed portion including a large number of concavo-convex portions formed on part or all of the inner wall surface of each plate-side refrigerant passage 46. . In this case, the concavo-convex portion can be formed by, for example, subjecting a metal material such as a cast coarse material to machining such as forging or cutting. That is, the concavo-convex portion can be formed without greatly changing the normal manufacturing process of the end plate 20. In FIG. 4, the surface roughness of the high surface roughness portion 54 is larger than in the case of FIG. Although not shown, a through hole is formed to open one end on the inner peripheral surface of the end plate 20 and the other end on the outer surface in the axial direction of the end plate 20, and a screw is formed on the inner peripheral surface of the through hole. The high surface roughness portion 54 can also be formed by the concavo-convex processed portion provided by cutting the groove.

  When such a rotating electrical machine 10 is used, oil is discharged from an oil pump 60 connected to the end of the pump shaft 28 and introduced into the axial refrigerant passage 30 of the pump shaft 28 as indicated by an arrow α in FIG. Is done. The oil is branched to both sides in the axial direction by the second axial refrigerant passage 34 through the radial direction refrigerant passage 32 connected from the axial direction refrigerant passage 30 to the inner part, and the corresponding side through the second refrigerant passages 36 and 38. It is supplied to the plate side refrigerant passage 46 of the end plate 20. Since centrifugal force acts on the oil flowing inside the rotor 16 when the rotating electrical machine 10 is used, as shown in FIG. 5, the oil flows radially outward from the discharge port 50 of the plate-side refrigerant passage 46, that is, the coil on the corresponding side. The scattered oil 56 is discharged toward the target position of the end 26. Thus, the coil end 26 is cooled by spraying the refrigerant onto the coil end 26.

  1 shows a rotating electrical machine cooling system 58. The rotating electrical machine cooling system 58 is an oil that is a refrigerant supply unit that supplies oil to the rotating electrical machine 10 and the shaft-side refrigerant passage 19 via the pump shaft 28. The pump 60 includes a refrigerant path 62 having one end connected to the bottom of the case 12 and the other end connected to the suction port P of the oil pump 60. The oil pump 60 sucks up oil accumulated at the bottom of the case 12 by driving and supplies the oil to the axial refrigerant passage 30 of the pump shaft 28.

  According to such a rotating electrical machine 10, the configuration of each end plate 20 does not become complicated, and a simple configuration can be achieved. Moreover, since the high-surface roughness portion 54 is provided in the plate-side refrigerant passage 46 of each end plate 20, the volume of oil discharged from the discharge port 50 is reduced even when the rotational speed of the rotor 16 is increased during use. Thus, the oil discharge pressure, that is, the scattering pressure can be reduced. For this reason, damage to the coil end 26 due to oil colliding with the coil end 26 can be effectively suppressed. As a result, damage to the coil end 26 can be effectively suppressed with a simple configuration while ensuring the cooling performance of the coil end 26.

  Even if the rotational speed of the rotor 16 increases, the density of the oil discharged from the discharge port 50 can be suppressed from rising excessively. Scattering when adhering can be suppressed. For this reason, the cooling efficiency of the coil end 26 can be increased.

[Second Embodiment]
FIG. 6 is a view of the end plate 64 constituting the rotary electric machine according to the second embodiment of the present invention as viewed from the outside in the axial direction. FIG. 7 is an enlarged view of a portion C in FIG. FIG. 8 is a DD cross-sectional enlarged view of FIG. 6 showing a state in which the end plate 64 is fixed to the rotor shaft 18. FIG. 9 is a view corresponding to FIG. 8 illustrating a state in which the refrigerant is discharged from the discharge port 50 when the rotor rotates.

  As shown in FIG. 6, the end plate 64 constituting the rotating electrical machine of the present embodiment has plate-side refrigerant passages 66 provided at radially inner portions at a plurality of locations (two locations in the drawing) at equal intervals in the circumferential direction. including. Each plate-side refrigerant passage 66 is a plate-side refrigerant passage 46 of the end plate 20 (see FIG. 3 etc.) used in the first embodiment, and has the same configuration as that in which the high surface roughness portion 54 is not provided. And an upstream passage 70 (FIG. 7) provided so that one end is opened at a radial intermediate portion of the bottom of the inner wall surface of the downstream passage 68. Each upstream side passage 70 has a high surface roughness portion 72 provided by forming a screw groove on the inner wall surface.

  As shown in FIG. 8, the other end of each upstream side passage 70 is the inner peripheral surface of the through hole 44 in the half of the end plate 64 opposite to the downstream side passage 68 in the axial direction (vertical direction in FIG. 8). Is open. Further, in the high surface roughness portion 72 of each upstream side passage 70, an air introduction hole 74 is connected to the inner wall surface on the front side with respect to the forward rotation direction of the end plate 64 (the arrow β direction in FIGS. 6 and 7). Yes. That is, each end plate 64 includes an air introduction hole 74 having an open end on one end side in the high surface roughness portion 72. The “forward rotation direction” refers to a rotation direction that is frequently used during normal times, such as one rotation direction corresponding to the direction in which the vehicle moves forward when the rotating electrical machine is for driving the vehicle.

  As shown in FIG. 6, the air introduction hole 74 extends in the circumferential direction of the end plate 64 or in a direction inclined with respect to the circumferential direction, and the other end opens on the axially outer surface of the end plate 64. The other end side of the air introduction hole 74 may be an axial portion formed so as to extend in the axial direction of the end plate 64, and the axial portion and the circumferential portion on one end side may be communicated with each other.

  Two end plates 64 configured as described above are fixed to the outer diameter side of the rotor shaft 18 so as to be adjacently disposed on both axial sides of the rotor core 40 (see FIG. 1). In this state, as shown in FIGS. 8 and 9, the second refrigerant passage 36 (or 38) provided in the rotor shaft 18 and the upstream passage 70 of the plate-side refrigerant passage 66 are communicated with each other. Further, the radially inner end of the downstream passage 68 is not opposed to the radially outer end of the second refrigerant passage 36 (or 38) but is closed by the rotor shaft 18.

  When such a rotating electrical machine is used, as shown in FIG. 9, the oil 76 that is the refrigerant supplied from the oil pump 60 (see FIG. 1) to the shaft-side refrigerant passage 19 and is a coolant is supplied to each plate-side refrigerant. The gas flows through the upstream passage 70 of the passage 66 and is discharged from the discharge port 50 toward the coil end 26 (see FIG. 1 and the like) on the radially outer side through the downstream passage 68. In this case, since the air introduction hole 74 is connected to the high surface roughness portion 72 of the upstream passage 70, air is mixed into the oil flowing through the high surface roughness portion 72 through the air introduction hole 74 when the rotor rotates, It becomes a gas-liquid mixed state, and air and oil are stirred and become foamy oil 78. For this reason, the foam oil 78 is discharged from the discharge port 50.

  Thus, since the oil discharged from the discharge port 50 of each plate side refrigerant path 66 can be made into foam, the density of the discharged oil can be further reduced. For this reason, even when the rotational speed of the rotor in use is increased, the discharge pressure of the oil discharged from the discharge port 50, that is, the scattering pressure can be reduced. For this reason, damage to the coil end 26 due to oil colliding with the coil end 26 (see FIG. 1 and the like) of the stator can be effectively suppressed. As a result, damage to the coil end 26 can be more effectively suppressed with a simple configuration while ensuring the cooling performance of the coil end 26. That is, by mixing air from the air introduction hole 74 into the oil flowing through the high surface roughness portion 72, the oil discharge pressure can be further reduced, and damage to the coil end 26 can be more effectively suppressed.

  Further, even if the rotational speed of the rotor is increased, excessive increase in the density of oil discharged from the discharge port 50 can be more effectively suppressed, so that increase in the oil scattering speed can be more effectively suppressed, and the coil Scattering when oil adheres to the end 26 can be suppressed. For this reason, the cooling efficiency of the coil end 26 can be increased.

  In addition, since the high surface roughness portion 72 is provided by forming a thread groove in the upstream side passage 70, the stirring of the air and oil taken in through the air introduction hole 74 is further promoted, and the foam is made more effective. be able to.

  In the above, the high surface roughness portion 72 is formed by a screw groove, but the present embodiment is not limited to this, and other uneven processing formed by machining such as other cutting processing, for example. It is also possible to form a high surface roughness portion in the plate-side refrigerant passage by a portion or the like and connect the air introduction hole to this high surface roughness portion. Other configurations and operations are the same as those in the first embodiment.

  In each of the above-described embodiments, the case where the refrigerant is oil has been described. However, the refrigerant is not limited to this, and other cooling liquids such as water and LLC can be used. Further, in each of the above embodiments, the plate-side refrigerant passage is provided only on one end plate of the two end plates arranged on both sides of the rotor core, and the high surface roughness is provided on the inner wall surface of the plate-side refrigerant passage. A part can be provided and the refrigerant can be discharged from the end plate on one side toward only the corresponding coil end on one side.

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machine, 12 Case, 14 Stator, 16 Rotor, 18 Rotor shaft, 19 Axis side refrigerant passage, 20 End plate, 22 Stator core, 24 Stator coil, 26 Coil end, 28 Pump shaft, 30 Axial refrigerant passage, 32 diameter Directional refrigerant passage, 34 second axial refrigerant passage, 36 one-side second refrigerant passage, 38 other-side second refrigerant passage, 40 rotor core, 42 permanent magnet, 44 through hole, 46 plate-side refrigerant passage, 48 inclined surface, 50 discharge Outlet, 52 Suppression member, 54 High surface roughness portion, 56 Scattered oil, 58 Rotating electric machine cooling system, 60 Oil pump, 62 Refrigerant path, 64 End plate, 66 Plate side refrigerant path, 68 Downstream path, 70 Upstream path , 72 High surface roughness portion, 74 Air introduction hole, 76 oil, 78 Foam oil.

Claims (5)

A rotor shaft including a shaft-side refrigerant passage through which the refrigerant flows;
A rotor that is provided on the outer diameter side of the rotor shaft and rotates during use;
A stator facing the outer diameter side of the rotor, and a stator coil end protruding from an end of the stator core,
The rotor is
Rotor core,
An end plate adjacently disposed in the axial direction of the rotor core,
The end plate is provided at a plate-side refrigerant passage formed so as to communicate with the shaft-side refrigerant passage, and at an end of the plate-side refrigerant passage, and is directed toward the stator coil end by a centrifugal force when the rotor rotates. A discharge port for discharging the refrigerant flowing through the plate side refrigerant passage,
The rotating electrical machine according to claim 1, wherein the plate-side refrigerant passage includes a high-surface roughness portion that is provided on an inner wall surface and reduces a density of the refrigerant discharged from the discharge port. In the rotating electrical machine according to claim 1,
The rotary electric machine according to claim 1, wherein the high surface roughness portion is a concavo-convex processed portion provided on an inner wall surface of the plate-side refrigerant passage. In the rotating electrical machine according to claim 1,
The rotating electrical machine according to claim 1, wherein the high surface roughness portion is a rough material surface portion that is provided on an inner wall surface of the plate-side refrigerant passage and is not subjected to machining with a cast rough material. The rotating electrical machine according to any one of claims 1 to 3,
A rotating electrical machine comprising an air introduction hole provided in the end plate and connected to the high surface roughness portion. The rotating electrical machine according to any one of claims 1 to 4,
A rotating electrical machine cooling system comprising: a refrigerant supply unit that supplies the refrigerant to the shaft-side refrigerant passage.

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