JP2012016240A - Rotary electric machine and cooling system for rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine that improves cooling performance while preventing generation of excessive drag resistance.SOLUTION: A rotary electric machine 10 includes: a rotating shaft 18 that has a shaft-side coolant passage 42 through which oil passes; a rotor 16 fixed to a radially outer side of the rotating shaft 18; and a stator 14. The rotor 16 has: a rotor core 28; an end plate 32 in contact with an axial end surface of the rotor core 28; a first rotor-side coolant passage 46 that is provided between the rotor core 28 and the end plate 32 so as to communicate with the shaft-side coolant passage 42 and with an axially outer surface of the end plate 32; and a second rotor-side coolant passage 52. The second rotor-side coolant passage 52 is provided on a radially outer side of the first rotor-side coolant passage 46 through a contact region between the end plate 32 and the rotor core 28 so as to be positioned on a radially inner side with respect to an outer periphery of the end plate 32, and is allowed to communicate with the axially outer surface of the end plate 32.

Description

  The present invention provides a rotation shaft that includes a rotation shaft that is rotatably provided and includes a shaft-side refrigerant passage through which a refrigerant flows, a rotor that is fixed to the outer diameter side of the rotation shaft, and a stator that faces the outer diameter side of the rotor. Regarding the electric machine and the rotating electric machine cooling system, the rotating electric machine cooling system is used, for example, to cool the permanent magnets and laminated steel sheets constituting the rotor to improve the cooling efficiency of the rotating electric machine.

  2. Description of the Related Art Conventionally known rotating electrical machines such as vehicle electric motors include a stator and a rotor. In such a rotating electrical machine, it is considered that the rotating electrical machine is effectively cooled by supplying a cooling liquid (for example, cooling oil) that is a refrigerant to a heat generating portion such as a rotor or a stator.

  For example, in the rotating electrical machine described in Patent Document 1, an annular stator is fixed to a case which is a housing, and a rotor is disposed opposite to the inner peripheral side of the stator via an air gap. The rotor is held by a rotating shaft that is rotatably supported by the case. The rotating shaft is hollow, and a coolant such as oil flows into a coolant supply path provided inside. In addition, a flow path for allowing the coolant to flow through a rotary shaft, a rotor core provided with a permanent magnet, and a member disposed opposite to both ends of the rotor core corresponding to the end plate is formed. It is said that the permanent magnet is cooled when the coolant flows through the flow path of the rotor core.

  Moreover, in the rotary electric machine described in Patent Document 2, an end plate side refrigerant passage communicating with a refrigerant passage formed in the shaft is provided between a rotor core formed of laminated steel plates and an end plate. In addition, the end plate is provided with a discharge hole communicating with the end plate-side refrigerant passage. It also describes that the gap between the opening edge of the magnet insertion hole of the rotor core and the magnet inserted into the magnet insertion hole is closed by a resin or a plate-like closing member.

JP 2009-118686 A JP 2009-27836 A

  In the configuration described in Patent Document 1, a flow path for flowing a coolant is provided between the end plate and the rotor core. In such a structure, due to the action of centrifugal force due to the rotation of the rotor itself during use, the coolant flows through the contact portion between the end plate and the rotor core so that the coolant oozes radially outward from the flow path, There is a possibility that the coolant enters the air gap between the stator and the stator. When coolant such as oil flows into the air gap, drag resistance, which is drag torque due to the viscosity of the coolant, is generated in the rotating electrical machine, which may reduce the cooling performance of the rotating electrical machine. Since the coolant in the gap causes an increase in loss of the rotating electrical machine, it is not preferable.

  In the case of the configuration described in Patent Document 2, the gap between the opening edge portion of the magnet insertion hole of the rotor core and the magnet inserted into the magnet insertion hole is closed by a resin or a plate-like closing member. However, no consideration is given to providing a resin or a blocking member in a portion other than the opening edge portion of the magnet insertion hole, and the refrigerant flows through the portion other than the opening edge portion of the magnet insertion hole at the contact portion between the rotor core and the end plate. There is a possibility of flowing into the air gap. Also in this case, there is a possibility that the cooling performance of the rotating electrical machine is reduced and the loss of the rotating electrical machine is increased.

  An object of the present invention is to prevent excessive drag resistance of a rotating electrical machine and improve the cooling performance in the rotating electrical machine and the rotating electrical machine cooling system.

  A rotating electrical machine according to the present invention includes a rotating shaft that is rotatably provided and includes a shaft-side refrigerant passage through which a refrigerant flows, a rotor that is fixed to the outer diameter side of the rotating shaft, and a stator that faces the outer diameter side of the rotor. And the rotor is provided between the rotor core, the end plate provided in contact with the axial end surface of the rotor core, and between the rotor core and the end plate. A first rotor side refrigerant passage communicating with both of the first rotor side refrigerant passage and the first rotor side refrigerant passage closer to the outer diameter side of the rotor than the first rotor side refrigerant passage, A second rotor-side refrigerant passage provided through a contact portion between the end plate and the rotor core, the second rotor-side refrigerant passage communicating with the axially outer side surface of the end plate. A rotary electric machine that.

  According to the above rotating electric machine, even when the refrigerant flowing through the first rotor side refrigerant passage flows radially outward through the contact portion between the rotor core and the end plate due to the centrifugal force caused by the rotation of the rotor itself, the refrigerant Most of the gas is discharged to the outside in the axial direction of the end plate through the second rotor side refrigerant passage. For this reason, the amount of refrigerant flowing into the air gap between the rotor and the stator can be reduced or eliminated. That is, a large amount of refrigerant that has flowed radially outward from the first rotor-side refrigerant passage flows into the second rotor-side refrigerant passage having a small flow path resistance, so that the amount of refrigerant flowing into the air gap can be reduced or eliminated. For this reason, the improvement of the cooling performance of the rotor by the use of the refrigerant and the reduction of the drag resistance of the rotating electrical machine can be achieved. As a result, excessive drag resistance of the rotating electrical machine can be prevented and the cooling performance can be improved.

  In the rotating electrical machine according to the present invention, preferably, the second rotor side refrigerant passage is provided in an annular shape in the end plate, and the end plate has one end opened on the outer surface of the end plate, and the second rotor side A refrigerant escape passage is provided in the axial direction so as to communicate with the refrigerant passage.

  In the rotating electrical machine according to the present invention, preferably, the rotor core has a laminate formed by laminating a plurality of steel plates in the axial direction.

  In the rotating electrical machine according to the present invention, preferably, the end plate has an annular main body portion having a first rotor-side refrigerant passage, and an annular shape arranged on the radially outer side of the annular main body portion and having a second rotor-side refrigerant passage. A resin member.

  In the rotating electrical machine according to the present invention, preferably, the end plate has an annular main body portion having a first rotor-side refrigerant passage and a radially outer side of the annular main body portion via an annular second rotor-side refrigerant passage. A disposed outer annular member.

  Moreover, the rotating electrical machine according to the present invention preferably includes a sealing material provided between the annular resin member or the outer annular member and the rotor core.

  According to the above configuration, the sealing material between the annular resin member or the outer annular member and the rotor core is provided on the outer diameter side of the second rotor-side refrigerant passage, and therefore flows into the air gap between the rotor and the stator. The refrigerant can be reduced or eliminated more effectively. For this reason, the cooling performance can be further improved without excessively increasing the drag resistance of the rotating electrical machine.

  In the rotating electrical machine according to the present invention, preferably, the sealing material is an adhesive, and the annular resin member or the outer annular member is joined to the axial end surface of the rotor core by an adhesive.

  According to the above configuration, the sealing effect of the refrigerant is improved by the adhesive, so that the amount of the refrigerant flowing into the air gap between the rotor and the stator can be reduced or eliminated more effectively. For this reason, it is possible to further improve the cooling performance while more effectively preventing the occurrence of excessive drag resistance of the rotating electrical machine.

  The rotating electrical machine cooling system according to the present invention is provided in the connecting path, the connecting path connecting the rotating electrical machine according to the present invention, the lower part of the casing constituting the rotating electrical machine and the shaft-side refrigerant path, and the shaft side. A rotating electrical machine cooling system comprising: a refrigerant supply unit that supplies refrigerant to the refrigerant passage.

  According to the rotating electrical machine and the rotating electrical machine cooling system according to the present invention, it is possible to prevent excessive drag resistance of the rotating electrical machine and improve the cooling performance.

1 is a schematic cross-sectional view of a rotating electrical machine cooling system including a rotating electrical machine according to a first embodiment of the present invention. It is AA sectional drawing of FIG. 1 about a rotor and a rotating shaft. In the first embodiment, the flow rate (a) of the coolant that can be discharged to the outside through the refrigerant escape passage from the second rotor side refrigerant passage, and the coolant that oozes out from the first rotor side refrigerant passage to the outer diameter side. It is a diagram which shows flow volume (b) by the relationship with the rotation speed of a rotor. It is a schematic sectional drawing of the rotary electric machine cooling system containing the rotary electric machine of 2nd Embodiment which concerns on this invention. FIG. 5 is a cross-sectional view of the rotor and the rotation shaft taken along the line BB in FIG. 4. It is the figure which took out the end plate shown in FIG. 5, and looked at the axial direction outer side surface. It is the figure which looked at the axial direction outer surface of one end plate which comprises the rotary electric machine of 3rd Embodiment concerning this invention.

[First Embodiment]
Hereinafter, a first embodiment according to the present invention will be described with reference to FIGS. 1 to 3. The rotating electrical machine of the present embodiment is used, for example, as a motor for driving a hybrid vehicle, as a generator for generating electric power, or as a device having both functions. As shown in FIG. 1, the rotating electrical machine 10 is a casing, a stator 14 fixed to the inner surface of a motor case 12 that is a housing, a rotor 16 disposed to face the inner side in the radial direction of the stator 14, and a rotating shaft 18. Is provided. Such a rotating electrical machine 10 is a refrigerant and cools by supplying oil, which is a coolant, to the rotor 16.

  That is, the stator 14 includes a stator core 20 configured by laminating a plurality of electromagnetic steel plates in the axial direction, and a stator coil 22 wound around teeth provided at a plurality of circumferential positions on the inner peripheral surface of the stator core 20. In the stator coil 22, a pair of coil ends is configured by portions protruding outward from both axial side surfaces of the stator core 20. The stator core 20 is fixed to the inner surface of the motor case 12.

  The motor case 12 houses a stator 14 and a rotor 16. The rotating shaft 18 is rotatably supported on the motor case 12 by a bearing 24. The rotor 16 is fixed to the outer diameter side of the intermediate portion in the axial direction of the rotating shaft 18, and is opposed to the inner side in the radial direction of the stator 14 via an air gap 26. In other words, the stator 14 faces the outer diameter side of the rotor 16.

  The rotor 16 includes a rotor core 28 having a laminate formed by laminating a plurality of electromagnetic steel plates in the axial direction, permanent magnets 30 arranged at a plurality of locations in the circumferential direction of the rotor core 28, and a pair of end plates 32. Including. The permanent magnet 30 is magnetized in the radial direction of the rotor 16 or in a direction inclined with respect to the radial direction.

  Further, an oil reservoir 34 having a function as a coolant is provided inside the lower part of the motor case 12. The oil in the oil reservoir 34 can be supplied to the rotor 16 by the oil pump 36. That is, the rotating electrical machine cooling system 38 of the present embodiment includes the rotating electrical machine 10 as described above, an oil path 40 that is a connection path for flowing oil as a refrigerant, and an oil pump 36 provided in the oil path 40. . The oil pump 36 is a refrigerant supply unit that pumps oil from the oil reservoir 34 and supplies oil to the rotating electrical machine 10 by driving.

  Further, the shaft side refrigerant passage 42 is provided on the central axis inside the rotary shaft 18. In addition, at each of the two positions in the axial direction of the rotating shaft 18, a second shaft side refrigerant passage 44 extending in the radial direction is provided at a plurality of circumferential positions. Each second shaft-side refrigerant passage 44 communicates with the shaft-side refrigerant passage 42, and one end of each second shaft-side refrigerant passage 44 is opened on the outer peripheral surface of the rotating shaft 18. That is, the rotating shaft 18 includes a shaft-side refrigerant passage 42 and a second shaft-side refrigerant passage 44 that are rotatably provided and through which oil as a refrigerant flows.

  The pair of end plates 32 are each made of metal or the like, and are provided so as to be in contact with both axial end surfaces of the rotor core 28. An annular first rotor-side refrigerant passage 46 that communicates with the shaft-side refrigerant passage 42 is provided between both axial end surfaces of the rotor core 28 and the side surfaces of the end plates 32 that face the both end surfaces. For this purpose, each end plate 32 is formed in a substantially annular shape, and an annular groove 48 is formed on the inner diameter side of the inner surface in the axial direction facing the end face of the rotor core 28, and the inner peripheral end of the annular groove 48 is It reaches the inner peripheral surface of the end plate 32. In addition, axial holes 50 are provided at a plurality of locations in the circumferential direction of the end plate 32 of each end plate 32 so as to communicate the outer periphery of the annular groove 48 and the axially outer surface of each end plate 32. The annular groove 48 and the axial hole 50 constitute a first rotor side refrigerant passage 46. The “inner side in the axial direction” of the end plate refers to the side facing the rotor core, and conversely, the “outer side in the axial direction” refers to the side opposite to the rotor core (in the entire specification and claims). The same.) That is, the first rotor side refrigerant passage 46 communicates with both the shaft side refrigerant passage 42 and the axially outer side surface of the end plate 32.

  Each end plate 32 is provided with a contact portion between the end plate 32 and the rotor core 28 on the outer diameter side of the first rotor side refrigerant passage 46 so as to be arranged on the inner diameter side with respect to the outer peripheral edge portion of the end plate 32. A second rotor side refrigerant passage 52 is provided therethrough. The second rotor side refrigerant passage 52 is provided in an annular shape coaxially with the end plate 32 on the inner side surface in the axial direction of the end plate 32. Further, in the axially outer portion of each end plate 32, refrigerant escape passages 54 are provided in the axial direction at a plurality of circumferentially equidistant locations (four locations in the case of FIG. 2). One end of each refrigerant escape passage 54 is opened on the outer surface in the axial direction of the end plate 32. The other end of each refrigerant escape passage 54 communicates with the second rotor side refrigerant passage 52. For this reason, the second rotor-side refrigerant passage 52 communicates with the outer surface in the axial direction of the end plate 32 via the refrigerant escape passage 54.

  Such a pair of end plates 32 are arranged on the outer diameter side of the rotary shaft 18 on both sides in the axial direction of the rotor core 28 so that the portions near the outer periphery of the respective inner surfaces in the axial direction are in contact with the axial end surfaces of the rotor core 28. is doing. In this state, the flange 56 integrally provided on the outer peripheral surface of the rotary shaft 18 and the caulking member 58 fixed to the rotary shaft 18 by being fitted to the rotary shaft 18 and caulking to the inner peripheral side, The rotor core 28 and the pair of end plates 32 are sandwiched. In this state, the first rotor-side refrigerant passage 46 communicates with the shaft-side refrigerant passage 42 of the rotating shaft 18 via the second shaft-side refrigerant passage 44.

  Further, the downstream end of the oil path 40 is connected to the shaft-side refrigerant path 42 provided in the rotating shaft 18, and the discharge port 60 provided in the lower part of the motor case 12 is connected to the upstream end of the oil path 40. That is, the oil path 40 connects the lower part of the motor case 12 and the shaft side refrigerant path 42. The opening (right end portion in FIG. 1) of the shaft side refrigerant passage 42 opposite to the connection side of the oil passage 40 is closed by a closing member (not shown). Further, as the oil functioning as the refrigerant, for example, an oil used for lubricating the transmission such as an automatic transmission fluid (ATF) can be used.

  In addition, the oil discharged from the discharge port 60 to the oil path 40 is cooled by an oil pan or the like, or cooled by an appropriate heat exchanging part that exchanges heat between the outside air or the cooling water and the oil, and then the shaft side refrigerant passage. Oil can also be supplied to 42.

  When the rotating electrical machine cooling system 38 including the rotating electrical machine 10 is used, oil is supplied from the oil reservoir 34 to the shaft-side refrigerant passage 42 by driving the oil pump 36. In addition, oil flows from the shaft-side refrigerant passage 42 into the first rotor-side refrigerant passage 46 through the second shaft-side refrigerant passage 44 by the action of centrifugal force accompanying the rotation of the rotating shaft 18. Most of the oil that flows into the first rotor-side refrigerant passage 46 flows as shown by an arrow a in FIG. 1, cools the surfaces of the rotor core 28 and the permanent magnet 30, and then the axial hole 50 that is the main discharge port. And discharged to the outside of the rotor 16. The released oil flows down in the motor case 12 and returns to the oil reservoir 34. For this reason, the permanent magnet 30 and the laminated body which comprises the rotor core 28 are liquid-cooled directly or indirectly by oil.

  In this case, when the oil flows into the first rotor-side refrigerant passage 46, as shown by the arrow b in FIG. 1, the oil penetrates radially outward through the contact portion between the rotor core 28 and the end plate 32 due to the action of centrifugal force. There is a possibility that a flow will occur. In this case, when the air gap 26 between the rotor 16 and the stator 14 is filled with oil by the refrigerant flow indicated by the arrow b, drag torque, that is, drag resistance is generated due to the viscosity of the oil, thereby cooling the rotating electrical machine 10. In addition to significantly reducing the effect, the loss of the rotating electrical machine 10 may increase.

  On the other hand, in the present embodiment, as described above, the second rotor side refrigerant passage 52 is disposed on the radially outer side of the first rotor side refrigerant passage 46 via the contact portion between the rotor core 28 and the end plate 32. Provided. For this reason, before the flow which oozes out from the contact part of the rotor core 28 and the end plate 32 reaches the air gap 26, as shown by an arrow c in FIG. The refrigerant can be discharged to the outside in the axial direction of the end plate 32 through the refrigerant escape passage 54. Therefore, the oil entering the air gap 26 can be reduced or eliminated.

  Next, the functions of the second rotor side refrigerant passage 52 and the refrigerant escape passage 54 will be described in more detail with reference to FIG. FIG. 2 is a cross-sectional view taken along the line AA of FIG. The end plate 32 is in metal contact with the axial end surface of the rotor core 28 (FIG. 1) at the contact surfaces S1 and S2 indicated by the oblique lattice of FIG. 2, and the contact surfaces S1, S1 are contacted by the caulking member 58 shown in FIG. It is fixed to the rotor core 28 in a state of receiving a predetermined surface pressure set in advance in S2. When the oil pump 36 (FIG. 1) is driven in a state where the rotary shaft 18 is rotating in the direction indicated by the arrow α in FIG. 2, the second shaft-side refrigerant passage is passed from the shaft-side refrigerant passage 42 provided in the rotary shaft 18. Oil as a coolant is introduced into the first rotor-side refrigerant passage 46 through 44. At this time, the oil introduced into the refrigerant passage 46 flows in the direction indicated by the arrow β in FIG. 2 with respect to the end plate 32 while receiving a centrifugal force, and is discharged to the back surface side in FIG. 2 through the axial hole 50. . At this time, an annular coolant layer that is an oil layer is provided in the first rotor side refrigerant passage 46 in the range indicated by the arrow γ on the outer peripheral side by the action of centrifugal force. The outer peripheral end of the coolant layer coincides with the outer peripheral end of the first rotor-side refrigerant passage 46, and the inner peripheral end of the coolant layer is at a position indicated by a broken line δ in FIG.

  Further, the coolant layer is pressed against the outer peripheral wall 62 constituting the outer peripheral portion of the first rotor side refrigerant passage 46 by the action of centrifugal force. In this case, pressure from the coolant layer is received by the outer peripheral wall 62 and the contact surface S1 of the end plate 32 and the rotor core 28. However, if the contact surface S1 does not have a sufficiently high sealing performance, there is a possibility that a flow of exudation outward in the radial direction in the direction of arrow b in FIG. 2 may occur. The oil that oozes out radially outward flows into the second rotor-side refrigerant passage 52, flows along the direction of the arrow d in the passage 52, and is the same as the outer peripheral end of the second rotor-side refrigerant passage 52 in the radial direction. The refrigerant is discharged from the refrigerant escape passage 54 installed so as to include the position to the back surface side of FIG. In this case, the flow passage resistance of the refrigerant escape passage 54 is sufficiently smaller than the path of oil flowing outside through the contact surface S2 on the outer diameter side of the second rotor side refrigerant passage 52. For this reason, the oil flowing into the air gap 26 (FIG. 1) through the contact surface S1 on the outer diameter side can be reduced or eliminated.

  That is, even when the oil flowing through the first rotor-side refrigerant passage 46 flows radially outward through the contact portion between the rotor core 28 and the end plate 32 by the action of centrifugal force due to the rotation of the rotor 16 (FIG. 1) itself, Most of the oil is discharged to the outside in the axial direction of the end plate 32 through the second rotor-side refrigerant passage 52. For this reason, the amount of oil flowing into the air gap 26 (FIG. 1) between the rotor 16 and the stator 14 can be reduced or eliminated. That is, a large amount of oil flowing radially outward from the first rotor-side refrigerant passage 46 flows through the second rotor-side refrigerant passage 52 and the refrigerant escape passage 54 having a small flow path resistance, and the amount of oil flowing into the air gap 26 Can be reduced or eliminated. For this reason, the improvement of the cooling performance of the rotor 16 by the use of oil and the reduction of the drag resistance of the rotating electrical machine 10 can be achieved. As a result, excessive drag resistance of the rotating electrical machine 10 can be prevented and the cooling performance can be improved.

  FIG. 3 shows the flow rate (solid line a) (discharge capacity) of the coolant that can be discharged to the outside from the second rotor side refrigerant passage 52 (FIGS. 1 and 2) through the refrigerant escape passage 54 in the present embodiment, The flow rate of the coolant that oozes out from the one-rotor-side refrigerant passage 46 to the outer diameter side (one-dot chain line b) is shown in relation to the rotational speed of the rotor 16. In the following description, the same elements as those in FIGS. 1 and 2 are denoted by the same reference numerals. The number of rotations of the rotor 16 is the amount of rotation of the rotor 16 per minute, which is a unit time. As shown in FIG. 3, as the number of rotations of the rotor 16 increases, both the discharge capacity of the coolant and the flow rate of the leaked coolant increase. On the other hand, in the present embodiment, the size and number of the refrigerant escape passages 54, the size and the outer diameter of the second rotor side refrigerant passage 52, and the like are discharged through the second rotor side refrigerant passage 52. The possible flow rate of oil is set to exceed the flow rate of oil that oozes out from the first rotor side refrigerant passage 46 to the outer diameter side in all the rotation speed regions of the rotor 16. For this reason, it is possible to more effectively prevent oil that oozes out to the outside in the radial direction of the first rotor-side refrigerant passage 46 through the contact portion between the rotor core 28 and the end plate 32, and to generate drag loss. It can be prevented more effectively.

  2 illustrates the oil flow in the end plate 32 portion arranged on one side of the rotor 16 (left side in FIG. 1), but the end arranged on the other side of the rotor 16 (right side in FIG. 1). The oil flow in the plate 32 portion is the same. Further, in the present embodiment, the case where the rotor core 28 includes a laminated body formed by laminating a plurality of steel plates has been described. However, the rotor core 28 may be configured by a powder magnetic core formed by press-molding magnetic powder. it can.

[Second Embodiment]
FIG. 4 is a schematic cross-sectional view of a rotating electrical machine cooling system including the rotating electrical machine according to the second embodiment of the present invention. FIG. 5 is a cross-sectional view taken along the line BB in FIG. 4 for the rotor and the rotating shaft. FIG. 6 is a view of the end plate shown in FIG. In the rotating electrical machine 10 of the present embodiment, in the rotating electrical machine of the first embodiment described above, each end plate 64 is fitted to the metallic annular annular body 66 and the outer diameter side of the annular body 66. It is comprised with the resin-made cyclic resin member 68 fixed together. Each annular main body 66 is provided with an annular groove 48 and an axial hole 50 in the same manner as the end plate 32 (see FIG. 1 and the like) of the first embodiment described above. The refrigerant escape passage is not provided in the annular main body 66. That is, each annular main body 66 has a configuration in which the outer peripheral portion including the second rotor-side refrigerant passage 52 and the refrigerant escape passage 54 (see FIG. 1 and the like) is omitted from the end plate 32 of the first embodiment. Have

  As shown in FIG. 5, each annular resin member 68 is formed by forming an annular groove 70 on the inner peripheral side of the inner surface in the axial direction, and the inner peripheral end of the annular groove 70 is formed on the inner peripheral surface of the annular resin member 68. Has reached. The annular groove 70 constitutes the second rotor side refrigerant passage 72. In addition, refrigerant escape passages 74 are provided in the axial direction at a plurality of circumferentially equally spaced locations (four locations in the example of FIG. 2) of each annular resin member 68. One end of each refrigerant escape passage 74 is opened on the outer surface in the axial direction of the annular resin member 68. The other end of each refrigerant escape passage 74 is in communication with the second rotor side refrigerant passage 72. For this reason, the second rotor side refrigerant passage 72 communicates with the axially outer side surface of the annular resin member 68 via the refrigerant escape passage 74.

  As shown in FIG. 6, an end plate 64 is configured by fitting and fixing an annular resin member 68 on the outside of each annular main body 66 by an interference fit or the like. In this state, as shown in FIG. 5, the second rotor-side refrigerant passage is disposed on the outer diameter side of the rotor 16 relative to the first rotor-side refrigerant passage 46 via an outer peripheral wall 62 provided on the outer peripheral portion of the annular main body 66. 72 is provided. Further, the second rotor side refrigerant passage 72 is disposed closer to the inner diameter side than the outer peripheral edge portion of the end plate 64.

  Further, a seal is provided between the annular resin member 68 and the rotor core 28 in a state where the axial inner surfaces of the annular main body 66 and the annular resin member 68 are disposed so as to face the axial end surface of the rotor core 28 (FIG. 4). An adhesive that is a material is provided. That is, the annular resin member 68 is joined to the axial end surface of the rotor core 28 with an adhesive and is brought into contact with the adhesive through the adhesive.

  In the rotating electrical machine cooling system 38 including such a rotating electrical machine 10, as shown in FIGS. 5 and 6, the first rotor side refrigerant passage 46, the axial hole 50, the second rotor side refrigerant passage 72, and the refrigerant escape passage 74. , And contact surfaces S1 and S2 ′ are provided in the same manner as in the configuration of FIG. In FIG. 5, the contact surface S1 between the annular main body 66 and the rotor core 28 and the contact surface S2 ′ between the annular resin member 68 and the rotor core 28 are respectively represented by the oblique lattice portion. An annular resin member 68 is represented by a lattice portion. With such a configuration, as in the first embodiment, the inflow of oil to the air gap 26 (FIG. 4) through the contact surfaces S1 and S2 ′ can be reduced or eliminated. Further, in the present embodiment, since an adhesive as a sealing material is provided between the annular resin member 68 and the rotor core 28, it is possible to improve the sealing effect against oil oozing out to the outer diameter side. That is, since the adhesive material between the annular resin member 68 and the rotor core 28 is provided on the outer diameter side of the second rotor side refrigerant passage 72, the oil flowing into the air gap 26 between the rotor 16 and the stator 14 is provided. The amount can be reduced or eliminated more effectively. For this reason, it is possible to further improve the cooling performance while more effectively preventing the occurrence of excessive drag resistance of the rotating electrical machine 10. Other configurations and operations are the same as those in the first embodiment described above, and a duplicate description is omitted. Instead of the adhesive, a sealing member such as rubber as a sealing material can be provided between the annular resin member 68 and the rotor core 28. In the present embodiment, the annular resin member 68 is not joined to the axial end surface of the rotor core 28 with an adhesive, and the fitting force for fitting and fixing the annular resin member 68 to the annular main body 66 or the flange portion 56 is used. The axial inner surface of the annular resin member 68 can be brought into contact with the axial end surface of the rotor core 28 by the axial force applied by the crimping member 58, that is, can be brought into direct contact without using a sealing material.

[Third Embodiment]
FIG. 7 is a view of the outer side surface in the axial direction of one end plate constituting the rotating electrical machine according to the third embodiment of the present invention. In the present embodiment, in the second embodiment shown in FIG. 4 to FIG. 6 described above, each end plate 78 has an annular main body 66 and an annular gap on the radially outer side of the annular main body 66. It is comprised by the outer side annular member 76 arrange | positioned facing. In FIG. 7, the outer annular member 76 is indicated by a hatched portion. The outer annular member 76 is formed in an annular shape with resin, for example.

  Further, in the state where the annular main body 66 is fixed to the outer diameter side of the rotary shaft 18, the axial inner side surface (the rear side surface in FIG. 7) of the outer annular member 76 disposed on the radially outer side of the annular main body 66 is sealed The material is bonded to the axial end surface of the rotor core 28 (see FIG. 1 and the like) with an adhesive or the like, and is brought into contact with the adhesive. The second rotor-side refrigerant passage 80 is configured by an annular space portion provided between the annular main body 66 and the outer annular member 76. That is, the annular second rotor-side refrigerant passage 80 communicates directly with the axially outer side surface (front side surface in FIG. 7) of the end plate 78 without passing through another passage. Further, the outer annular member 76 is arranged on the outer side in the radial direction of the annular main body 66 via an annular second rotor-side refrigerant passage 80. Further, the inner end in the axial direction of the second rotor side refrigerant passage 80 (the rear end in FIG. 7) reaches the inner end in the axial direction of the end plate 78. For this reason, the second rotor-side refrigerant passage 80 is disposed on the inner diameter side of the outer peripheral edge portion of the outer annular member 76, which is the outer peripheral edge portion of the end plate 78. In the present embodiment, the outer annular member 76 is not joined to the axial end surface of the rotor core 28 with an adhesive, and the outer annular member 76 is directly brought into contact with the axial end surface of the rotor core 28 without a sealant. You can also. For example, protrusions that protrude radially outward are provided at a plurality of circumferential positions on the outer peripheral surface of the axially outer end portion of the annular main body 66, and the outer annular member 76 is pressed against the rotor core 28 by the axially inner side surface of each protrusion. The axial inner end surface of the outer annular member 76 can be brought into direct contact with the axial end surface of the rotor core 28 without using an adhesive as a sealing material.

  In the case of this embodiment as well, as in each of the above embodiments, the oil that oozes out radially outward from the first rotor-side refrigerant passage 46 is the second rotor-side refrigerant having a small flow path resistance. A large amount of oil flows into the passage 80, and the amount of oil flowing into the air gap 26 (see FIG. 1 and the like) can be reduced or eliminated. Other configurations and operations are the same as those of the second embodiment shown in FIG. 4 to FIG. 6 or the first embodiment shown in FIG. 1 to FIG. Is omitted.

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machine, 12 Motor case, 14 Stator, 16 Rotor, 18 Rotating shaft, 20 Stator core, 22 Stator coil, 24 Bearing, 26 Air gap, 28 Rotor core, 30 Permanent magnet, 32 End plate, 34 Oil reservoir, 36 Oil Pump, 38 Rotating electrical machine cooling system, 40 Oil path, 42 Shaft side refrigerant path, 44 Second shaft side refrigerant path, 46 First rotor side refrigerant path, 48 Annular groove, 50 Axial hole, 52 Second rotor side refrigerant path , 54 Refrigerant escape passage, 56 collar portion, 58 caulking member, 60 discharge port, 62 outer peripheral wall, 64 end plate, 66 annular main body portion, 68 annular resin member, 70 annular groove, 72 second rotor side refrigerant passage, 74 refrigerant Relief passage, 76 Outer annular member, 78 End plate, 80 Second rotor side cooling Passage.

Claims (8)

A rotating shaft that is rotatably provided and includes a shaft-side refrigerant passage through which a refrigerant flows;
A rotor fixed to the outer diameter side of the rotating shaft;
A stator facing the outer diameter side of the rotor,
The rotor
Rotor core,
An end plate provided in contact with the axial end face of the rotor core;
A first rotor side refrigerant passage that is provided between the rotor core and the end plate and communicates with both the axial refrigerant passage and the axially outer surface of the end plate;
further,
The second rotor side provided on the outer diameter side of the rotor with respect to the first rotor side refrigerant passage via the contact portion between the end plate and the rotor core so as to be arranged on the inner diameter side with respect to the outer peripheral edge portion of the end plate. A rotating electrical machine comprising a second rotor-side refrigerant passage which is a refrigerant passage and communicates with an axially outer side surface of an end plate. In the rotating electrical machine according to claim 1,
The second rotor side refrigerant passage is provided in an annular shape in the end plate,
The end plate has a refrigerant escape passage that is open at one end on an axially outer side surface of the end plate and is provided in the axial direction so as to communicate with the second rotor side refrigerant passage. In the rotating electrical machine according to claim 1 or 2,
The rotor core has a laminate formed by laminating a plurality of steel plates in the axial direction. The rotating electrical machine according to any one of claims 1 to 3,
The end plate includes an annular main body portion having a first rotor-side refrigerant passage, and an annular resin member disposed on a radially outer side of the annular main body portion and having a second rotor-side refrigerant passage. The rotating electrical machine according to any one of claims 1 to 3,
The end plate includes an annular main body portion having a first rotor-side refrigerant passage, and an outer annular member disposed on the radially outer side of the annular main body portion via an annular second rotor-side refrigerant passage. Rotating electric machine. In the rotating electrical machine according to claim 4 or 5,
A rotating electrical machine comprising a sealing material provided between an annular resin member or an outer annular member and a rotor core. In the rotating electrical machine according to claim 6,
The sealing material is an adhesive,
The rotating electrical machine, wherein the annular resin member or the outer annular member is joined to the axial end surface of the rotor core with an adhesive. The rotating electrical machine according to any one of claims 1 to 7,
A connection path that connects the lower part of the casing constituting the rotating electrical machine and the shaft-side refrigerant path;
A rotating electrical machine cooling system, comprising: a refrigerant supply unit that is provided in the connection path and supplies the refrigerant to the shaft-side refrigerant path.

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