Rotary electric machine

Abstract

To provide a rotary electric machine capable of suppressing an excessive flow of a cooling liquid to an outer peripheral direction of a rotor from a slot of a stator core with a simple construction.SOLUTION: A rotary electric machine comprises: a stator 10; a rotor 11; a first liquid chamber 21; and a second liquid chamber. The stator 10 includes a stator core 14 and a coil 15. In an internal peripheral part of the stator core 14, a plurality of teeth and a plurality of slots 31 are alternately provided. The cooling liquid introduced to the first liquid chamber 21 is flown to a second liquid chamber via the plurality of slots 31. On one end side of at least a shaft direction of the stator core 14, a flow regulation part for regulating a flow of the cooling liquid to an inner side region of a radial direction of the slot 31 from the first liquid chamber 21 is provided. In a part of the slot 31 on the one end side of the shaft direction, a channel open area S1 between the coil 15 positioned to an inner side of the most radial direction and the flow regulation part is set to be smaller than a channel open area S2 between the adjacent coils 15 in the slot 31.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a rotating electrical machine.

Background Art

[0002] As a rotating electrical machine such as an electric motor or a generator, there is one in which a rotor is rotatably disposed inside the radial direction of an annular stator. The stator includes a stator core and a coil wound around the stator core. The stator core is integrally formed with, for example, a cylindrical back yoke and a plurality of teeth protruding radially inward from the back yoke. Slots are formed between a plurality of adjacent teeth in the circumferential direction. The coil is wound around each tooth through slots disposed on both sides of the tooth.

[0003] In this type of rotating electrical machine, since the coil becomes hot during use, it is desired to efficiently cool the coil. As a method for efficiently cooling the coil of the rotating electrical machine, a method of continuously flowing a coolant inside a rotating electrical machine case that houses the stator is known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the above rotating electrical machine, when flowing a coolant in the rotating electrical machine case, liquid chambers may be provided at one end side and the other end side in the axial direction of the stator core, respectively, and the slots of the stator core may be used as passages for flowing the coolant from one liquid chamber to the other liquid chamber. In this case, when the coolant flows in the slot, the circumferential region of the coil in the slot can be efficiently cooled.

[0006] However, if the slot is used as a passage for the coolant to flow through, the coolant flowing out radially inward from the slot enters the air gap between the rotor and the stator, preventing the smooth rotation of the rotor. Therefore, when the slot is used as a passage for the coolant to flow through, it is necessary to provide a complex seal structure for preventing the leakage of the coolant in each slot. In the case of this method, the manufacturing of the stator becomes complicated, which tends to hinder the efficiency improvement of the production of the rotating electrical machine.

[0007] Therefore, the present invention aims to provide a rotating electrical machine capable of suppressing excessive outflow of the coolant from the slots of the stator core toward the outer peripheral direction of the rotor with a simple configuration, and thus contributing to the improvement of energy efficiency.

Means for Solving the Problems

[0008] In order to solve the above problems, the rotating electrical machine according to the present invention employs the following configuration. That is, the rotating electrical machine according to the present invention includes a cylindrical stator core (for example, the stator cores 14, 114, 314 in the embodiment) in which a plurality of teeth (for example, the teeth 28 in the embodiment) and a plurality of slots (for example, the slots 31 in the embodiment) are alternately provided on the inner peripheral portion, a stator (for example, the stator 10 in the embodiment) having a plurality of coils (for example, the coils 15 in the embodiment) wound around each of the teeth through the slots, a rotor (for example, the rotor 11 in the embodiment) rotatably disposed radially inside the stator, a first liquid chamber (for example, the first liquid chamber 21 in the embodiment) provided facing one end surface in the axial direction of the stator core, and a second liquid chamber (for example, the second liquid chamber 22 in the embodiment) provided facing the other end surface in the axial direction of the stator core. The rotating electrical machine is configured such that the coolant introduced into the first liquid chamber flows into the second liquid chamber through the plurality of slots. At least one end side in the axial direction of the stator core is provided with an outflow restricting portion (for example, the bulging portion 40, the slot closing portion 46, the radially inner edge portion 57 in the embodiment) that restricts the outflow of the coolant from the first liquid chamber to the radially inner region of the slot. In the slot portion on one end side in the axial direction, the flow path opening area (for example, the flow path opening area S1 in the embodiment) between the coil located most radially inside in the slot and the outflow restricting portion is set to be smaller than the flow path opening area (for example, the flow path opening area S2 in the embodiment) between the adjacent coils in the slot.

[0009] With the above configuration, the cooling liquid in the first liquid chamber flows into the second liquid chamber through a plurality of slots of the stator core. At this time, the coil in the slot is cooled by the cooling liquid. At this time, on one end side in the axial direction of the stator core, the outflow of the cooling liquid from the first liquid chamber to the radially inner region of the slot is restricted by the outflow restricting portion. In the slot portion on one end side in the axial direction, the flow path opening area between the coil located most radially inward and the outflow restricting portion is set smaller than the flow path opening area between the adjacent coils in the slot. For this reason, the flow rate of the cooling liquid flowing from the first liquid chamber into the radially inner region of the slot becomes smaller than the flow rate of the cooling liquid flowing from the first liquid chamber through the gap between the coils to the second liquid chamber side. Therefore, excessive outflow of the cooling liquid from the slot of the stator core toward the outer peripheral direction of the rotor is suppressed.

[0010] Inside the first liquid chamber, a guide member (for example, the first end portion 37f and the guide member 55 in the embodiment) for guiding the cooling liquid to the slot on one end side in the axial direction of the stator core is provided. The guide member abuts on or is close to one end face in the axial direction of the stator core, and has a shielding portion (for example, the bulging portion 40 and the radially inner edge portion 57 in the embodiment) for suppressing the flow of the cooling liquid to the radially inner region of the slot on one end side in the axial direction of the stator core. The shielding portion may be configured to form the outflow restricting portion.

[0011] In this case, for the guide member that guides the cooling liquid to the slot on one end side in the axial direction of the stator core, the shielding portion abuts on or is close to one end face in the axial direction of the stator core. Thereby, the flow of the cooling liquid to the radially inner region of the slot on one end side in the axial direction of the stator core is suppressed by the shielding portion. As a result, the flow rate of the cooling liquid flowing from the first liquid chamber into the radially inner region of the slot becomes smaller than the flow rate of the cooling liquid flowing from the first liquid chamber through the gap between the coils to the second liquid chamber side. Therefore, when this configuration is adopted, without changing the shape of the slot portion of the stator core, excessive outflow of the cooling liquid from the slot toward the outer peripheral direction of the rotor can be suppressed, and the rotary electric machine 1 can be manufactured at low cost.

[0012] The guide member may be locked in contact with the stator core.

[0013] In this case, since the guide member is locked in contact with the stator core, the guide member and the stator core vibrate in the same phase. Therefore, play or rubbing due to contact is less likely to occur between the guide member and the stator core.

[0014] The guide member may be provided with a contact seat (for example, the contact seat 41 in the embodiment) that contacts one end face in the axial direction of the stator core.

[0015] In this case, when the coolant flows from the first liquid chamber to the second liquid chamber through the plurality of slots, the liquid pressure in the first liquid chamber becomes higher than the liquid pressure in the second liquid chamber. Therefore, the guide member is pressed in the direction of the second liquid chamber by the pressure difference between the coolants in the first liquid chamber and the second liquid chamber. At this time, the contact seat of the guide member contacts one end face in the axial direction of the stator core, and the guide member is locked to the stator core. Therefore, when this configuration is adopted, even if the space for locking the guide member to the stator core is narrow, the guide member can be reliably locked to the stator core. Further, in this configuration, since no separate parts such as fastening members are required to lock the guide member to the stator core, the assembly work during the manufacture of the rotating electrical machine is also facilitated.

[0016] The first liquid chamber is partitioned by a first inner peripheral wall (for example, the first inner peripheral wall 32 in the embodiment) on the radially inner side, the second liquid chamber is partitioned by a second inner peripheral wall (for example, the second inner peripheral wall 35 in the embodiment) on the radially inner side, and an annular partition wall (for example, the annular partition wall 37 in the embodiment) that partitions between the inner peripheral surface of the stator core and the outer peripheral surface of the rotor is installed on the outer peripheral surfaces of the first inner peripheral wall and the second inner peripheral wall, and the shielding portion may be formed on a part of the annular partition wall.

[0017] In this case, the inner peripheral surface of the stator core and the rotor are partitioned by an annular partition wall installed between the first inner peripheral wall and the second inner peripheral wall. Therefore, even if the coolant flowing in the plurality of slots flows out to the radially inner region of the slots, the coolant does not flow into the outer peripheral surface of the rotor. Further, if the coolant flowing in the plurality of slots excessively flows out to the radially inner region of the slots, there is a concern that the annular partition wall may be deformed by being pressed radially inward by the coolant. However, in this configuration, since a shielding portion is formed in a part of the annular partition wall, excessive outflow of the coolant to the radially inner region of the slots is suppressed by the shielding portion. Therefore, when this configuration is adopted, it is possible to suppress the annular partition wall from being deformed by being pressed radially inward by the coolant.

[0018] A portion of the slots disposed on one axial end side of the stator core may be configured by a closed slot in which the radially inner side of the stator core is closed, and a slot closing portion (for example, the slot closing portion 46 of the embodiment) that closes the radially inner side of the closed slot may constitute the outflow restricting portion.

[0019] In this case, a portion disposed on one axial end side of the stator core is configured by a closed slot, and the flow of the coolant into the radially inner region of the slot is suppressed by the slot closing portion on the radially inner side of the closed slit. As a result, the flow rate of the coolant flowing from the first liquid chamber into the radially inner region of the slot becomes smaller than the flow rate of the coolant flowing from the first liquid chamber through the gap between the coils to the second liquid chamber side.

[0020] The slots axially inner than the portion that is the closed slot may be configured by open slots that open to the inner peripheral side of the stator core, and the stator core may be provided with a coolant escape portion (for example, the slit 81 and the notch groove 82 of the embodiment) that communicates with the portion of the slots that are the open slots.

[0021] In this case, a part of the coolant that has passed through the closed slot on one end side in the axial direction of the stator core flows out toward the outer peripheral surface of the rotor through the opening inside the diameter direction of the open slot. However, the part that is the open slot communicates with the coolant discharge part of the stator core. For this reason, a part of the coolant that has flowed into the open slot is discharged to the outside through the coolant discharge part of the stator core, and excessive outflow to the outer peripheral surface side of the rotor is suppressed.

[0022] On the opposing surfaces of the coils arranged adjacent to each other in the slot, concave grooves (for example, the concave groove 50 of the embodiment) extending along the axial direction of the stator core may be formed.

[0023] In this case, since concave grooves are formed on the opposing surfaces of the coils arranged adjacent to each other in the slot, the flow path opening area between the adjacent coils can be easily and surely enlarged. Therefore, when this configuration is adopted, the flow path opening area between the coil located most inside in the diameter direction in the slot and the outflow restricting part can be easily and surely made smaller than the flow path opening area between the adjacent coils.

Effect of the Invention

[0024] In the rotating electric machine according to the present invention, in the slot portion on one end side in the axial direction, the flow path opening area between the coil located most inside in the diameter direction and the outflow restricting part is set smaller than the flow path opening area between the coils. For this reason, the flow rate of the coolant flowing from the first liquid chamber into the inner region in the diameter direction of the slot can be made smaller than the flow rate of the coolant flowing from the first liquid chamber through the gap between the coils to the second liquid chamber side. Therefore, when the rotating electric machine according to the present invention is adopted, excessive outflow of the coolant from the slot of the stator core toward the outer peripheral direction of the rotor can be suppressed with a simple configuration, and thus it can contribute to energy efficiency improvement.

Brief Description of the Drawings

[0025]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Embodiments for Carrying Out the Invention

[0026] Hereinafter, each embodiment of the present invention will be described with reference to the drawings. In each of the embodiments described below, the same reference numerals are given to common parts, and some overlapping descriptions will be omitted.

[0027] <First Embodiment> FIG. 1 is a longitudinal sectional view of the rotating electrical machine 1 according to the present embodiment. The rotating electrical machine 1 of this embodiment includes a stator 10 and a rotor 11. The stator 10 and the rotor 11 are housed inside a rotating electrical machine case 12. The stator 10 is fixed inside the rotating electrical machine case 12 by fastening with bolts 13 or the like. The stator 10 includes a cylindrical stator core 14 and a plurality of coils 15 wound around the stator core 14. The rotor 11 is rotatably disposed radially inside the stator core 14 (stator 10).

[0028] The rotor 11 has permanent magnets (not shown) attached in the vicinity of its outer peripheral surface. The rotor 11 is integrally rotatably supported on a rotating shaft 17 via a sleeve 16. The rotating shaft 17 serves as an output shaft when the rotating electrical machine 1 is used as a motor, and serves as a power input shaft when the rotating electrical machine 1 is used as a generator. The rotating shaft 17 and the sleeve 16 are rotatably supported on the rotating electrical machine case 12 via bearings 18. In the following description, the direction parallel to the rotation axis C of the rotor 11 is referred to as the axial direction, the rotation direction of the rotor 11 is referred to as the circumferential direction, and the radial direction of the rotor 11 orthogonal to the axial direction and the circumferential direction is referred to as the radial direction.

[0029] Annular first side cases 19 and second side cases 20 are disposed at one end side and the other end side in the axial direction of the stator core 14. The main parts of the first side cases 19 and the second side cases 20 are formed by the rotating electrical machine case 12.

[0030] The first side case 19 covers from the outside one end face in the axial direction of the stator core 14 and the exposed portion of the coil 15 protruding from the end face. The first side case 19 forms an annular first liquid chamber 21 together with one end face in the axial direction of the stator core 14. An introduction port 24 for introducing a coolant 23 into the first liquid chamber 21 is formed in the first side case 19. The introduction port 24 is connected to a circulation circuit 25 of the coolant 23. The coolant 23 introduced into the first liquid chamber 21 cools the exposed portion of the coil 15 protruding from one end face of the stator core 14, and then passes through the inside of the stator core 14 and flows into the other end side in the axial direction of the stator core 14.

[0031] The second side case 20 covers the other axial end face of the stator core 14 and the exposed portion of the coil 15 protruding from that end face from the outside. The second side case 20 forms an annular second liquid chamber 22 together with the other axial end face of the stator core 14. The coolant 23 introduced into the first liquid chamber 21 flows into the second liquid chamber 22 through the inside of the stator core 14. The coolant 23 introduced into the second liquid chamber 22 cools the exposed portion of the coil 15 protruding from the other end face of the stator core 14. The second side case 20 is formed with a discharge port 26 for discharging the coolant 23 in the second liquid chamber 22 to the outside. The discharge port 26 is connected to the circulation circuit 25 of the coolant 23. The coolant 23 that has cooled the coil 15 in the second liquid chamber 22 is returned from the discharge port 26 to the circulation circuit 25.

[0032] A feed pump P is connected in the middle of the circulation circuit 25. A heat exchanger OC that cools the coolant 23 by heat exchange with the outside air is connected upstream of the feed pump P in the circulation circuit 25. The downstream side of the feed pump P is connected to the introduction port 24. Also, the upstream side of the heat exchanger OC in the circulation circuit 25 is connected to the discharge port 26.

[0033] FIG. 2 is a cross-sectional view showing an enlarged view of part II of FIG. 1 of the rotating electrical machine 1. FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2 of the rotating electrical machine 1. In FIG. 2, the coil 15 is shown by a phantom line. The stator core 14 is formed, for example, by axially laminating a plurality of electromagnetic steel sheets. As shown in FIG. 3, the stator core 14 is integrally formed with a cylindrical back yoke 27 and a plurality of teeth 28 protruding radially inward from the inner peripheral portion of the back yoke 27. The back yoke 27 is formed such that the center of the cylinder coincides with the rotation axis C.

[0034] As shown in FIG. 3, the teeth 28 are arranged at intervals in the circumferential direction. The teeth 28 are formed in a T shape when viewed from the axial direction. That is, the teeth 28 are integrally formed with a tooth body 29 that protrudes radially inward from the inner circumferential portion of the back yoke 27, and a flange portion 30 that protrudes from the inner end in the radial direction of the tooth body 29 to both sides in the circumferential direction.

[0035] A slot 31 with an open inner side in the radial direction is formed between the circumferentially adjacent teeth 28. The slot 31 is formed surrounded by the opposing side walls of the adjacent teeth 28 and the inner circumferential wall of the back yoke 27. The side walls of each tooth 28 are formed by the side portion of the tooth body 29 and the side portion of the flange portion 30. The portion of the slot 31 formed by the side portions of the left and right tooth bodies 29 has a substantially constant width. Also, the width of the portion of the slot 31 formed by the side portions of the left and right flange portions 30 is narrower than the width of the portion formed by the side portions of the left and right tooth bodies 29.

[0036] The coils 15 are provided, for example, in three phases of U phase, V phase, and W phase. The coils 15 are configured by connecting a plurality of segment coils to each other, for example. The segment coil has a core wire covered with an insulating coating. The segment coil is formed by a flat wire. That is, the cross-sectional shape along the radial direction in each segment coil is formed in a substantially rectangular shape.

[0037] The segment coil is a coil element in which two slot insertion portions (segment conductors) inserted into adjacent slots 31 on the stator core 14 are integrally connected on the other end side in the axial direction of the stator core 14. The end portions of the slot insertion portions (segment conductors) protruding from the slot 31 to the one end side in the axial direction of the stator core 14 are joined to the end portions of the slot insertion portions of other segment coils by TIG welding, laser welding, or the like. The plurality of segment coils thereby constitute a continuous long coil.

[0038] As shown in FIG. 3, the slot insertion portions of the plurality of coils 15 inserted into the same slot 31 are arranged in a row along the radial direction. In the present embodiment, for example, five coils 15 are inserted into the same slot 31. However, the number of coils 15 inserted into the same slot 31 is not limited to this and can be arbitrarily set.

[0039] Inside each slot 31 in which the plurality of coils 15 are arranged, a gap d communicating with one end side and the other end side in the axial direction of the stator core 14 is secured. The gap d is secured between the inner surface of the slot 31 and the plurality of coils 15 and between the adjacent coils 15 within the slot 31. This gap d is a gap that conducts the first liquid chamber 21 and the second liquid chamber 22 shown in FIG. 1, and functions to allow the coolant 23 introduced into the first liquid chamber 21 to flow toward the second liquid chamber 22 side. The coolant 23 flowing through the slot 31 absorbs the heat of the slot insertion portions of the respective coils 15.

[0040] In addition, concave grooves 50 extending along the axial direction of the stator core 14 are formed on the surfaces of each coil 15 arranged in the slot 31 facing the radially inner side and the outer side. The concave grooves 50 are formed to be recessed in a substantially arc shape toward the central region in the width direction of the coil 15. The concave grooves 50 are formed on the opposing surfaces of the coils 15 adjacent in the radial direction when the plurality of coils 15 are arranged in the slot 31. For this reason, between the adjacent coils 15 arranged, a flow path extending in the axial direction is secured by the concave grooves 50 on the respective opposing surfaces.

[0041] Here, as shown in FIGS. 1 and 2, the first side case 19 on one end side in the axial direction of the stator core 14 includes a first inner peripheral wall 32 facing the first liquid chamber 21. The first inner peripheral wall 32 protrudes cylindrically from the radially inner end of the end side wall 33 of the first side case 19 located at the outer axial end of the first liquid chamber 21 toward one axial end face of the rotor 11. In the case of this embodiment, the first inner peripheral wall 32 is composed of a peripheral wall main body portion 12a integrally formed with the rotating electrical machine case 12 (end side wall 33) and a separate cylindrical member 34 attached to the outer peripheral surface on the extending end side of the peripheral wall main body portion 12a. The space between the peripheral wall main body portion 12a and the cylindrical member 34 is sealed by an annular seal member 60. However, the first inner peripheral wall 32 may be entirely integrally formed with the rotating electrical machine case 12 (end side wall 33).

[0042] Also, the second side case 20 on the other end side in the axial direction of the stator core 14 includes a second inner peripheral wall 35 facing the second liquid chamber 22. The second inner peripheral wall 35 protrudes cylindrically from the radially inner end of the end side wall 36 of the second side case 20 located at the outer axial end of the second liquid chamber 22 toward the other axial end face of the rotor 11. In the case of this embodiment, the second inner peripheral wall 35 is integrally formed with the rotating electrical machine case 12 (end side wall 36). However, the second inner peripheral wall 35 may be configured by a peripheral wall main body portion integral with the rotating electrical machine case 12 (end side wall 36) and a separate cylindrical member, similar to the first inner peripheral wall 32.

[0043] On the outer peripheral surfaces of the outer peripheral surface of the first inner peripheral wall 32 of the first side case 19 and the outer peripheral surface of the second inner peripheral wall 35 of the second side case 20, a cylindrical annular partition wall 37 is installed. The annular partition wall 37 is formed of, for example, a resin material. However, the annular partition wall 37 can also be formed of other materials such as a metal material. The annular partition wall 37 has a first end portion 37f facing the inside of the first liquid chamber 21, a second end portion 37s facing the inside of the second liquid chamber 22, and a partition wall main body portion 37b between the first end portion 37f and the second end portion 37s and facing the inner peripheral surface of the stator core 14. The first end portion 37f is formed with the same inner diameter as the partition wall main body portion 37b. The second end portion 37s has a reduced diameter in a stepped manner with respect to the partition wall main body portion 37b at an intermediate portion in the extending direction.

[0044] The inner peripheral surface of the first end portion 37f is slidably fitted to the outer peripheral surface of the cylindrical member 34 of the first inner peripheral wall 32. An annular groove 38f is formed on the outer peripheral surface of the cylindrical member 34, and an annular seal member 39f such as an O-ring is attached to the annular groove 38f. The space between the cylindrical member 34 (first inner peripheral wall 32) and the first end portion 37f (annular partition wall 37) is hermetically sealed by the seal member 39f. In the present embodiment, the first end portion 37f constitutes a guide member that guides the coolant in the first liquid chamber 21 to the opening of the slot 31 on one axial end side of the stator core 14 inside the first liquid chamber 21.

[0045] The inner peripheral surface of the reduced diameter portion of the second end portion 37s is slidably fitted to the outer peripheral surface of the second inner peripheral wall 35. An annular groove 38s is formed on the outer peripheral surface of the second inner peripheral wall 35, and an annular seal member 39s such as an O-ring is attached to the annular groove 38s. The space between the second inner peripheral wall 35 and the second end portion 37s (annular partition wall 37) is hermetically sealed by the seal member 39s.

[0046] The annular partition wall 37 has its first end portion 37f fitted in a liquid-tight manner to the first inner peripheral wall 32 of the first side case 19 and its second end portion 37s fitted in a liquid-tight manner to the second inner peripheral wall 35 of the second side case 20 as described above. The annular partition wall 37 partitions the radially inner region of the stator core 14 attached inside the rotating electric machine case 12 from the outer peripheral surface of the rotor 11. Therefore, even if the coolant 23 leaks from the slot 31 of the stator core 14 into the radially inner region, it is possible to prevent the coolant 23 from flowing into the outer peripheral surface side of the rotor 11.

[0047] Also, as shown in FIG. 2, a bulging portion 40 that bulges radially outward from the outer peripheral surface of the partition wall main body portion 37b is formed on the outer peripheral surface of the first end portion 37f of the annular partition wall 37. The end portion of the bulging portion 40 on the stator core 14 side stands radially outward in a stepped manner with respect to the outer peripheral surface of the partition wall main body portion 37b. This standing end surface serves as a contact seat 41 that contacts the end surface on one axial end side of the stator core 14. The annular partition wall 37 is pressed as a whole toward the other end side in the axial direction by the difference between the pressure of the coolant 23 in the first liquid chamber 21 acting on the first end portion 37f and the pressure of the coolant 23 in the second liquid chamber 22 acting on the second end portion 37s. At this time, the contact seat 41 is pressed against the end surface on one side in the axial direction of the stator core 14. As a result, the annular partition wall 37 is locked in contact with the stator core 14.

[0048] Here, the contact seat 41 (bulging portion 40) of the first end portion 37f shields a part of the radially inner region of the slot 31 that opens to one end surface in the axial direction of the stator core 14 from the first liquid chamber 21 side. The contact seat 41 (bulging portion 40) is formed so as to cover a predetermined height range radially outward from the radially inner end of the slot 31 on the first liquid chamber 21 side. Specifically, as shown in FIG. 3, the contact seat 41 (bulging portion 40) is formed such that the radially outer end has a protruding height that is substantially in contact with the radially inner end of the coil 15 that is positioned most inwardly within the slot 31 in an axial view. In the present embodiment, the bulging portion 40 constitutes a shielding portion (outflow regulating portion) that regulates the outflow of the coolant 23 from the first liquid chamber 21 into the radially inner region of the slot 31.

[0049] In the slot 31 portion on one axial end side of the stator core 14, as shown in FIG. 2, the flow path opening area S1 between the coil 15 located most radially inward in the slot 31 and the bulging portion 40 (outflow restricting portion) is set to be smaller than the flow path opening area S2 between the adjacent coils 15 in the slot 31. Specifically, between the coil 15 located most radially inward and the bulging portion 40 (outflow restricting portion), a flow path opening area S1 approximately equal to the concave groove 50 on one side of the coil 15 is secured, and between the adjacent coils 15, a flow path opening area S2 obtained by approximately adding up the opening areas of the two concave grooves 50 on the opposing surfaces is secured.

[0050] Also, as described above, the annular partition wall 37 installed between the first side case 19 and the second side case 20 is maintained in a state of being in contact with or sufficiently close to the inner peripheral surface of the stator core 14, as shown in FIG. 3. Further, the inner peripheral surface of the partition wall main body portion 37b of the annular partition wall 37 faces the outer peripheral surface of the rotor 11 with a minute gap therebetween so as not to be in contact with the outer peripheral surface of the rotor 11.

[0051] When a current continuously flows through the coil 15 during the operation of the rotating electrical machine 1 having the above configuration, the coil 15 generates heat and becomes high in temperature. At this time, the coolant 23 is introduced into the first liquid chamber 21 of the rotating electrical machine 1 from the circulation circuit 25 through the introduction port 24. The coolant 23 introduced into the first liquid chamber 21 cools the one - end - side region of the coil 15 exposed to the outside from one axial end side of the stator core 14 by flowing in the first liquid chamber 21. Further, the coolant 23 flows from one axial end side to the other end side through the plurality of slots 31 of the stator core 14 and flows into the second liquid chamber 22. The coolant flowing in the slot 31 cools the coil 15 inserted in the slot 31. Also, the coolant 23 that has flowed into the second liquid chamber 22 cools the other - end - side region of the coil 15 exposed to the outside from the other axial end side of the stator core 14, and then is returned to the circulation circuit 25 through the discharge port 26.

[0052] As described above, in the rotating electrical machine 1, the stator 10 is always immersed in the coolant 23 within the rotating electrical machine case 12, and in this state, the coolant 23 within the rotating electrical machine case 12 is exchanged through the circulation circuit 25. For this reason, the coil 15 of the stator 10 is efficiently cooled by the coolant 23.

[0053] As described above, in the rotating electrical machine 1 of the present embodiment, the first end portion 37f of the annular partition wall 37 is disposed on one axial end side (the side facing the first liquid chamber 21) of the stator core 14, and the bulging portion 40 (outflow regulating portion) of the first end portion 37f regulates the outflow of the coolant 23 from the first liquid chamber 21 to the radially inner region. And in the slot 31 portion on one axial end side of the stator core 14, the flow path opening area S1 between the coil 15 located most radially inward within the slot 31 and the bulging portion 40 (outflow regulating portion) is set to be smaller than the flow path opening area S2 between the adjacent coils 15 within the slot 31. For this reason, the flow rate of the coolant 23 flowing from the first liquid chamber 21 to the radially inner region of the slot 31 can be made less than the flow rate of the coolant 23 flowing from the first liquid chamber 21 through the gaps between the coils 15 to the second liquid chamber 22 side. Therefore, when the rotating electrical machine 1 of the present embodiment is adopted, excessive outflow of the coolant 23 from the slot 31 of the stator core 14 toward the outer peripheral direction of the rotor 11 can be suppressed with a simple configuration. Thus, the rotating electrical machine 1 of the present embodiment can contribute to energy efficiency improvement.

[0054] Also, in the rotating electrical machine 1 of the present embodiment, the first inner peripheral wall 32 and the second inner peripheral wall 35 are respectively provided in the first liquid chamber 21 and the second liquid chamber 22, and an annular partition wall 37 that partitions the space between the inner peripheral surface of the stator core 14 and the outer peripheral surface of the rotor 11 is installed on the outer peripheral surfaces of the first inner peripheral wall 32 and the second inner peripheral wall 35. For this reason, even if the coolant 23 flowing within the plurality of slots 31 flows out to the radially inner region of the stator core 14, the coolant 23 does not flow into the outer peripheral surface of the rotor 11. Therefore, when this configuration is adopted, it is possible to prevent the rotation of the rotor 11 from being hindered by the coolant 23. In addition, if the cooling liquid flowing through the plurality of slots 31 excessively flows out into the radially inner region of the slot 31, there is a concern that the annular partition wall 37 may be deformed by being pressed radially inward by the cooling liquid 23. However, in the rotating electric machine 1 of the present embodiment, since the bulging portion 40 (outflow restricting portion) is provided at one axial end side of the annular partition wall 37, the excessive outflow of the cooling liquid 23 into the radially inner region of the slot 31 is suppressed by the bulging portion 40. Therefore, when the rotating electric machine 1 of the present embodiment is adopted, it is possible to prevent the annular partition wall 37 from being deformed by being pressed radially inward by the cooling liquid 23. As a result, it becomes possible to maintain the stable rotational performance of the rotating electric machine 1 over a long period of time.

[0055] Further, in the rotating electric machine 1 of the present embodiment, the first end portion 37f of the annular partition wall 37 functions as a guide member that guides the cooling liquid 23 to the slot 31 portion on one axial end side of the stator core 14. Further, the bulging portion 40 provided at the first end portion 37f functions as a shielding portion (outflow restricting portion) that contacts or is close to one end face in the axial direction of the stator core 14 and suppresses the flow of the cooling liquid 23 into the radially inner region of the slot 31 portion on one axial end side of the stator core 14. Therefore, when the rotating electric machine 1 of the present embodiment is adopted, it is possible to suppress the excessive outflow of the cooling liquid from the slot 31 to the outer peripheral direction of the rotor 11 without changing the shape of the slot 31 portion of the stator core 14. As a result, it becomes possible to manufacture the rotating electric machine 1 at low cost.

[0056] Furthermore, in the rotating electric machine 1 of the present embodiment, the first end portion 37f (guide member) of the annular partition wall 37 is structured to be locked in contact with the stator core 14. Therefore, when the stator core 14 (stator 10) vibrates, the annular partition wall 37 vibrates in the same phase as the stator core 14 (stator 10). Therefore, even if the partition wall main body portion 37b of the annular partition wall 37 is brought close to the inner peripheral surface of the stator core 14, it is difficult for play or rubbing due to contact to occur between the annular partition wall 37 and the stator core 14. Note that the partition wall main body portion 37b of the annular partition wall 37 may be brought into contact with the inner peripheral surface of the stator core 14. Therefore, when the rotating electrical machine 1 of the present embodiment is adopted, the air gap between the stator core 14 and the rotor 11 can be narrowed for charging without causing abnormal noise or member deterioration due to rubbing, and the magnetic performance of the rotating electrical machine 1 can be enhanced.

[0057] In the rotating electrical machine 1 of the present embodiment, a contact seat 41 that contacts one end face in the axial direction of the stator core 14 is provided at the first end portion 37f of the annular partition wall 37. When the coolant 23 flows from the first liquid chamber 21 to the second liquid chamber 22 through the plurality of slots 31, the hydraulic pressure in the first liquid chamber 21 becomes higher than the hydraulic pressure in the second liquid chamber 22. For this reason, the first end portion 37f of the annular partition wall 37 is pressed in the direction of the second liquid chamber 22 by the pressure difference of the coolant 23 between the first liquid chamber 21 and the second liquid chamber 22. In the rotating electrical machine 1 of the present embodiment, at this time, the contact seat 41 of the first end portion 37f contacts the end face in the axial direction of the stator core 14, and thereby the first end portion 37f is locked to the stator core 14. Therefore, when the rotating electrical machine 1 of the present embodiment is adopted, even if the space for locking the first end portion 37f (guide member) to the stator core 14 is narrow, the first end portion 37f can be surely locked to the stator core 14. Further, in this case, since no separate parts such as fastening members are required to lock the first end portion 37f to the stator core 14, the assembly work during the manufacture of the rotating electrical machine 1 is also facilitated.

[0058] Further, in the rotating electrical machine 1 of the present embodiment, a concave groove 50 extending along the axial direction of the stator core 14 is formed on the opposing surfaces (surfaces facing the radial direction of the stator core 14) of the coils 15 arranged adjacent to each other in the slot 31. For this reason, the flow path opening area S2 between the coils 15 arranged adjacent to each other in the slot 31 can be easily and surely enlarged. Therefore, when this configuration is adopted, the flow path opening area S1 between the coil 15 located most radially inward in the slot 31 and the bulging portion 40 of the annular partition wall 37 can be easily and surely made smaller than the flow path opening area S2 between the adjacent coils 15.

[0059] <Second Embodiment> FIG. 4 is a cross-sectional view corresponding to FIG. 2 of the first embodiment of the rotating electrical machine 101 of the present embodiment. FIG. 5 is a cross-sectional view taken along the line V-V of FIG. 4 of the rotating electrical machine 101 of the present embodiment. In the rotating electrical machine 101 of the present embodiment, among the plurality of steel plates 45 constituting the stator core 114, the shape of the slot 31e of the steel plate 45e on one end side in the axial direction (the side facing the first liquid chamber 21) is different from the shape of the other slots 31. The configuration of the other parts is substantially the same as that of the first embodiment described above.

[0060] The slot 31e of the steel plate 45e on one end side in the axial direction is constituted by a closed slot in which the radially inner side of the stator core 114 is closed. That is, in the slot 31e, the radially inner end of the coil insertion portion extending along the radial direction is closed by the slot closing portion 46. For this reason, the ends of the respective slots 31e do not open on the inner peripheral surface of the steel plate 45e on one end side in the axial direction. The inner peripheral surface of the steel plate 45e has a continuous peripheral surface shape.

[0061] The partition body portion 37b of the annular partition 37 is fitted to the inner peripheral surface of the steel plate 45e. In the present embodiment, the first end portion 37f of the annular partition 37 that functions as a guide member is locked in contact with the inner peripheral surface of the stator core 114 via the partition body portion 37b.

[0062] The slot closing portion 46 of the steel plate 45e on one end side in the axial direction constitutes an outflow restricting portion that restricts the outflow of the coolant from the first liquid chamber 21 to the radially inner region of the slot 31 at one end portion in the axial direction of the stator core 114. The slots 31 of the steel plates 45 other than the steel plate 45e on one end side in the axial direction are constituted by open slots that open radially inward. In the present embodiment, only one steel plate 45e on one end side in the axial direction is a closed slot, but a plurality of steel plates 45 on one end side in the axial direction may be closed slots.

[0063] In the slot 31e portion of the steel plate 45e on one end side in the axial direction, the flow path opening area S1 between the coil 15 positioned most radially inward within the slot 31e and the slot closing portion 46 (outflow regulation portion) is set to be smaller than the flow path opening area S2 between adjacent coils 15 within the slot 31e. Specifically, in the case of this embodiment, between the coil 15 positioned most radially inward and the slot closing portion 46 (outflow regulation portion), a flow path opening area S1 approximately equal to the concave groove 50 on one side of the coil 15 is secured, and between adjacent coils 15, a flow path opening area S2 approximately equal to the sum of the opening areas of the two concave grooves 50 on the opposing surfaces is secured.

[0064] As described above, in the rotating electrical machine 101 of this embodiment, in the slot 31e portion on one end side in the axial direction of the stator core 114, the flow path opening area S1 between the coil 15 positioned most radially inward within the slot 31e and the slot closing portion 46 (outflow regulation portion) is set to be smaller than the flow path opening area S2 between adjacent coils 15 within the slot 31. For this reason, the flow rate of the coolant flowing into the radially inner region of the slot 31 from the first liquid chamber 21 can be made less than the flow rate of the coolant flowing from the first liquid chamber 21 through the gaps between the coils 15 to the second liquid chamber side. Therefore, when the rotating electrical machine 101 of this embodiment is adopted, excessive outflow of the coolant from the slot 31 of the stator core 114 to the outer peripheral direction of the rotor 11 can be suppressed with a simple configuration.

[0065] Also, since the rotating electrical machine 101 of this embodiment has a configuration substantially the same as that of the first embodiment except for the shape of the slot 31e of the steel plate 45e on one end side in the axial direction, the same effects as those of the above-described first embodiment can be obtained.

[0066] <Third Embodiment> FIG. 6 is a cross-sectional view corresponding to FIG. 2 of the first embodiment of the rotating electrical machine 201 of this embodiment. In the rotating electrical machine 201 of the present embodiment, the slots 31 of the stator core 14 are open slots that open radially inward for all steel plates, similar to the first embodiment. The rotating electrical machine 201 of the present embodiment does not include an annular partition wall 37 such as in the first embodiment or the second embodiment. In the rotating electrical machine 201, an annular guide member 55 is locked in a fitting state to a first inner peripheral wall 32 (cylindrical member 34) facing the first liquid chamber 21. The guide member 55 is formed of, for example, a resin material.

[0067] The guide member 55 includes a cylindrical wall 55a that is fitted to the outer peripheral surface of the first inner peripheral wall 32 (cylindrical member 34), and a flange wall 55b that projects radially outward from an end portion on the side facing the end surface of the stator core 14 of the cylindrical wall 55a. A plurality of coil insertion holes 56 that penetrate in the plate thickness direction are formed in the flange wall 55b. The coil insertion holes 56 are substantially rectangular holes that extend along the radial direction, and are formed at positions corresponding to the plurality of slots 31 of the stator core 14. End portions of a plurality of coils 15 inserted into the respective slots 31 of the stator core 14 are inserted into the respective coil insertion holes 56 so as to be drawn out toward the first liquid chamber 21 side. The flange wall 55b is in contact with one end surface in the axial direction of the stator core 14 (the end surface facing the first liquid chamber 21).

[0068] The radially inner edge portions 57 of the respective coil insertion holes 56 of the flange wall 55b are in contact with the inner peripheral edge portion of the end surface of the stator core 14. Therefore, the edge portions 57 of the respective coil insertion holes 56 shield the radially inner region of the corresponding slot 31 of the stator core 14 from the first liquid chamber 21 side. In the present embodiment, the radially inner edge portions 57 of the flange wall 55b of the guide member 55 constitute a shielding portion (outflow restricting portion). The radially inner edge portions 57 of the coil insertion holes 56 restrict the outflow of the coolant from the first liquid chamber 21 to the radially inner region of the slots 31. Further, the guide member 55 functions to guide the coolant to the slots 31 on one end side in the axial direction of the stator core 14 inside the first liquid chamber 21.

[0069] In the slot 31 portion on one axial end side of the stator core 14, the flow path opening area S1 between the coil 15 located most radially inward within the slot 31 and the radially inner edge portion 57 of the coil insertion hole 56 of the guide member 55 is set to be smaller than the flow path opening area S2 between the adjacent coils 15 within the slot 31.

[0070] As described above, in the rotating electrical machine 201 of the present embodiment, in the slot 31 portion on one axial end side of the stator core 14, the flow path opening area S1 between the coil 15 located most radially inward and the edge portion 57 of the guide member 55 is set to be smaller than the flow path opening area S2 between the coils 15. For this reason, the flow rate of the coolant flowing from the first liquid chamber 21 into the radially inner region of the slot 31 can be made smaller than the flow rate of the coolant flowing from the first liquid chamber 21 through the gap between the coils 15 toward the second liquid chamber side. Therefore, when the rotating electrical machine 201 of the present embodiment is adopted, excessive outflow of the coolant from the slot 31 of the stator core 14 toward the outer peripheral direction of the rotor 11 can be suppressed with a simple configuration. In the case of the present embodiment, since an annular partition wall is not arranged between the inner peripheral surface of the stator core 14 and the outer peripheral surface of the rotor 11, a part of the coolant that has flowed out radially inward of the slot 31 may flow in the direction of the outer peripheral surface of the rotor 11. However, in the present embodiment, since the flow rate of the coolant flowing out from the first liquid chamber 21 into the radially inner region of the slot 31 is restricted by the edge portion 57 of the guide member 55 (flow path opening area S1 < flow path opening area S2), it is possible to prevent the outflow of the coolant in the direction of the outer peripheral surface of the rotor 11 from becoming excessive and inhibiting the rotation of the rotor 11 due to the coolant.

[0071] <Fourth Embodiment> FIG. 7 is a longitudinal sectional view of the rotating electrical machine 301 of the present embodiment, and FIG. 8 is an enlarged sectional view of part VIII in FIG. 7. FIG. 9 is a sectional view taken along line IX - IX in FIG. 7, and FIG. 10 is a sectional view taken along line X - X in FIG. 7. Further, FIG. 11 is a sectional view taken along line XI - XI in FIG. 8, and FIG. 12 is a sectional view taken along line XII - XII in FIG. 8. The rotating electrical machine 301 of the present embodiment is the same as that of the first embodiment, in which the stator 10 and the rotor 11 are housed inside the rotating electrical machine case 12, and the stator 10 is fixed inside the rotating electrical machine case 12 by bolts 13. The rotor 11 is integrally rotatably supported on the rotating shaft 17 via a sleeve 16. Further, the rotating shaft 17 is rotatably supported by the rotating electrical machine case 12 via a bearing 18. A supply passage 76 for a coolant 23 (lubricating fluid) is provided in the axial center portion of the rotating shaft 17. A supply hole 77 is formed in the vicinity of the support position of the bearing 18 of the rotating shaft 17 so as to penetrate in the radial direction and supply the coolant 23 in the supply passage 76 to the bearing 18.

[0072] The stator 10 includes a cylindrical stator core 314 and a plurality of coils 15 wound around the stator core 314. As shown in FIG. 8, the stator core 314 is formed by axially laminating a plurality of steel plates 45 (electromagnetic steel plates). As shown in FIGS. 9 and 10, the stator core 314 is integrally formed with a cylindrical back yoke 27 and a plurality of teeth 28 protruding radially inward from the inner peripheral portion of the back yoke 27. A slot 31 is formed between adjacent teeth 28 in the circumferential direction. The plurality of coils 15 are wound around the teeth 28 via the slots 31.

[0073] The rotating electrical machine case 12 has a first side case 19 and a second side case 20. The first side case 19 covers from the outside the one end face in the axial direction of the stator core 314 and the exposed portion of the coil 15 protruding from the end face. The first side case 19 forms an annular first liquid chamber 21 together with the one end face in the axial direction of the stator core 314. The second side case 20 covers, from the outside, the other axial end face of the stator core 314 and the exposed portion of the coil 15 protruding from the end face. The second side case 20 forms an annular second liquid chamber 22 together with the other axial end face of the stator core 314. An introduction port 24 for introducing the coolant 23 into the first liquid chamber 21 is formed in the first side case 19, and a discharge port 26 for discharging the coolant 23 in the second liquid chamber 22 to the outside is formed in the second side case 20. The introduction port 24 and the discharge port 26 are connected to the circulation circuit 25. The coolant introduced from the circulation circuit 25 into the first liquid chamber 21 flows into the second liquid chamber 22 through the slots 31 of the stator core 314 while cooling the coil 15, and is returned from the second liquid chamber 22 to the circulation circuit 25 through the discharge port 26.

[0074] As shown in FIGS. 8 and 9, among the steel plates 45 constituting the stator core 314, the steel plate 45e disposed at one axial end is such that the slot 31e (31) is constituted by a closed slot. That is, the slot 31e of the end steel plate 45e is closed by a slot closing portion 46 at the radially inner end of the coil insertion portion extending along the radial direction. Further, the remaining steel plates 45a, 45b, 45c constituting the stator core 314 are constituted by open slots opening radially inward.

[0075] The coil 15 inserted into the slot 31 of the stator core 314 is constituted by a flat angle line having a substantially rectangular cross section, as shown in FIGS. 9 and 10. Each coil 15 has a concave groove 50 formed along the axial direction of the stator core 314 on the surface facing the radial direction in the state of being inserted into the slot 31. Also, a gap d that allows the coolant 23 to flow from the first liquid chamber 21 to the second liquid chamber 22 is secured between the slot 31 and the coil 15 and between adjacent coils 15.

[0076] The slot closing portion 46 of the steel plate 45e on one axial end side constitutes an outflow restricting portion that restricts the outflow of the coolant 23 from the first liquid chamber 21 to the radially inner region of the slot 31 at one axial end of the stator core 314. As shown in FIG. 9, in the slot 31e portion of the steel plate 45e on one end side in the axial direction, the flow path opening area S1 between the coil 15 located most radially inward in the slot 31e and the slot closing portion 46 (outflow restricting portion) is set smaller than the flow path opening area S2 between the adjacent coils 15 in the slot 31e. Specifically, between the coil 15 located most radially inward and the slot closing portion 46 (outflow restricting portion), a flow path opening area S1 approximately equal to the concave groove 50 on one side of the coil 15 is secured, and between the adjacent coils 15, a flow path opening area S2 approximately equal to the sum of the opening areas of the two concave grooves 50 on the opposing surfaces is secured.

[0077] Also, an annular guide member 355 is attached to the inner peripheral surface on one end side in the axial direction of the stator core 314. The guide member 355 is composed of a guide main body 355a made of a hard resin and an annular seal 355c made of an elastomer supported by the guide main body 355a. One end portion 355b in the axial direction of the guide main body 355a is formed with a thin wall, and the end portion 355b is adhesively fixed in a fitted state to the inner peripheral surface of the end portion in the axial direction of the stator core 314. Specifically, the end portion 355b of the guide main body 355a is fixed to the inner peripheral surface of the steel plate 45e at the end of the stator core 314. The annular seal 355c is joined to the other end portion with the thickness of the guide main body 355a.

[0078] The guide member 355 extends from one end portion in the axial direction of the stator core 314 toward the end side wall 33 of the first side case 19, and the annular seal 355c is in close contact with the inner surface of the end side wall 33. The guide member 355 constitutes an annular partition wall that partitions the radially inner region of the first liquid chamber 21.

[0079] Also, the inner peripheral surface of the steel plate 45e at the axial end of the stator core 314 is formed to have a larger diameter than the inner peripheral surfaces of the other steel plates 45a, 45b, and 45c as shown in FIG. 8. More specifically, the inner peripheral surface of the steel plate 45e is formed to have a larger diameter than the inner peripheral surfaces of the other steel plates 45a, 45b, and 45c by the thickness of the thin end portion 355b of the guide body 355a. Thereby, a gap having the same width as the gap 80 between the inner peripheral surfaces of the other steel plates 45a, 45b, and 45c of the stator core 314 and the outer peripheral surface of the rotor 11 is secured between the inner peripheral surface of the end portion 355b of the guide body 355a and the outer peripheral surface of the rotor 11.

[0080] In the two steel plates 45a adjacent to the steel plate 45e at the end of the stator core 314, as shown in FIGS. 8 and 11, a plurality of slits 81 extending radially outward (vertically downward) from the inner peripheral surface are formed. The plurality of slits 81 are formed only in a partial region of the stator core 314 below the rotation axis 17. The slits 81 are arranged on both circumferential sides of the plurality of slots 31 located below the rotation axis 17 and extend to a position (lower position) closer to the outer peripheral surface of the stator core 314 than the slots 31.

[0081] In the steel plate 45b adjacent to the steel plate 45a axially inward of the stator core 314, as shown in FIGS. 8 and 12, a notch groove 82 opening toward the outer peripheral surface of the stator core 314 is formed. The notch groove 82 opens vertically downward below the rotation axis 17. Further, the notch groove 82 communicates with the plurality of slits 81 of the adjacent steel plate 45a. The plurality of slits 81 and the notch groove 82 constitute a coolant discharge portion for discharging the coolant 23 that has flowed into the gap 80 between the inner peripheral surface of the stator core 314 and the outer peripheral surface of the rotor 11 to the outside of the stator 10. The coolant 23 that has flowed into the gap 80 between the inner peripheral surface of the stator core 314 and the outer peripheral surface of the rotor 11 is discharged to the bottom of the rotating electrical machine case 12 through the slits 81 and the notch groove 82. As shown in FIG. 8, the coolant 23 that lubricates the bearing 18 through the supply passage 76 and the supply hole 77 of the rotating shaft 17 is guided by the guide body 355a of the guide member 55 and discharged to the bottom of the rotating electric machine case 12 through the gap 80, the slit 81, and the notch groove 82.

[0082] As described above, in the rotating electric machine 301 of the present embodiment, in the slot 31e portion on one axial end side of the stator core 314, the flow path opening area S1 between the coil 15 located most radially inward in the slot 31e and the slot closing portion 46 (outflow restricting portion) is set to be smaller than the flow path opening area S2 between the adjacent coils 15 in the slot 31. For this reason, the flow rate of the coolant 23 flowing from the first liquid chamber 21 into the radially inner region of the slot 31 can be made smaller than the flow rate of the coolant 23 flowing from the first liquid chamber 21 through the gap between the coils 15 to the second liquid chamber side. Therefore, when the rotating electric machine 301 of the present embodiment is adopted, excessive outflow of the coolant 23 from the slot 31 of the stator core 314 toward the outer peripheral direction of the rotor 11 can be suppressed.

[0083] Also, in the case of the rotating electric machine 301 of the present embodiment, the slots 31 formed in the steel plates 45a, 45b, 45c other than the steel plate 45e on one axial end side of the stator core 314 are configured by open slots that open radially inward. For this reason, a part of the coolant 23 that has flowed out radially inward of the slot 31 may flow into the gap 80 between the inner peripheral surface of the stator core 314 and the outer peripheral surface of the rotor 11. However, in the present embodiment, since the flow rate of the coolant flowing out from the first liquid chamber 21 into the radially inner region of the slot 31 can be restricted by the slot closing portion 46 of the end steel plate 45e (flow path opening area S1 < flow path opening area S2), the outflow amount of the coolant 23 toward the outer peripheral surface direction of the rotor 11 can be suppressed.

[0084] Furthermore, in the rotating electrical machine 301 of the present embodiment, slits 81 and notch grooves 82, which are coolant escape portions, are provided in some of the steel plates 45a and 45b that are open slots. For this reason, a part of the coolant that has passed through the closed slots on one end side in the axial direction of the stator core 314 is discharged to the outside through the slits 81 and notch grooves 82 provided in some of the steel plates 45a and 45b. Therefore, when the rotating electrical machine 301 of the present embodiment is adopted, it is possible to more reliably suppress the excessive outflow of the coolant 23 that has flowed into the open slots of the stator core 314 to the outer peripheral surface side of the rotor 11.

[0085] In particular, in the rotating electrical machine 301 of the present embodiment, the slits 81 and notch grooves 82 are provided below the rotation axis 17 of the steel plates 45a and 45b that are open slots so as to extend vertically downward. For this reason, it is possible to reliably discharge the excess coolant 23 to the outside of the stator core 314 by utilizing the gravity acting on the coolant 23. Further, when this configuration is adopted, the discharge flow rate of the coolant 23 from the stator core 314 can be easily adjusted by changing the shape, size, etc. of the slits 81 and notch grooves 82.

[0086] Also, in the rotating electrical machine 301 of the present embodiment, a configuration is adopted in which the guide body 355a of the guide member 355 is fixed to the axial end of the stator core 314, and the annular seal 355c of the guide member 355 is in close contact with the end side wall of the first side case 19. In the case of this configuration, the radially inner region of the first liquid chamber 21 can be partitioned by the guide member 355 without providing an inner peripheral wall that is difficult to manufacture on the first side case 19 side. Therefore, when this configuration is adopted, it is possible to facilitate the manufacture of the rotating electrical machine case 12.

[0087] Note that the present invention is not limited to the above-described embodiments, and various design changes are possible without departing from the gist thereof. For example, in the above-described fourth embodiment, the coolant discharge portion is formed by the plurality of slits 81 and the notch grooves 82, but the configuration of the coolant discharge portion is not limited to the slits 81 and the notch grooves 82. The coolant discharge portion may be any structure that can discharge a part of the coolant 23 to the outside from an open slit. For example, it may have a configuration of only slots or only notch grooves.

Explanation of Reference Numerals

[0088] 1, 101, 201, 301... Rotating Electric Machine 10... Stator 11... Rotor 14, 114, 314... Stator Core 15... Coil 21... First Liquid Chamber 22... Second Liquid Chamber 28... Teeth 31, 31e... Slots 32... First Inner Peripheral Wall 35... Second Inner Peripheral Wall 37... Annular Partition Wall 37f... First End (Guide Member) 40... Bulging Portion (Shielding Portion, Flow-Out Regulation Portion) 41... Contact Seat 46... Slot Closing Portion (Flow-Out Regulation Portion) 50... Concave Groove 55... Guide Member 57... Radially Inner Edge Portion (Shielding Portion, Flow-Out Regulation Portion) 81... Slit (Coolant Discharge Portion) 82... Notch Groove (Coolant Discharge Portion) S1... Flow Path Opening Area S2... Flow Path Opening Area

Claims

1. A stator having a cylindrical stator core with a plurality of teeth and a plurality of slots alternately provided on an inner peripheral portion, and a plurality of coils wound around each of the teeth through the slots, A rotor rotatably disposed radially inside the stator, A first liquid chamber provided facing one end face of the stator core in the axial direction, A second liquid chamber provided facing the other end face of the stator core in the axial direction, and comprising: A rotating electrical machine in which a coolant introduced into the first liquid chamber flows into the second liquid chamber through the plurality of slots, An outflow restricting portion for restricting the outflow of the coolant from the first liquid chamber to the radially inner region of the slot is provided on at least one end side of the stator core in the axial direction, A rotating electrical machine characterized in that, in the slot portion on one end side in the axial direction, the flow path opening area between the coil located most radially inward in the slot and the outflow restricting portion is set smaller than the flow path opening area between the adjacent coils in the slot.

2. Inside the first liquid chamber, a guide member for guiding the coolant to the slot on one end side in the axial direction of the stator core is provided, The guide member has a shielding portion that abuts or is close to one end face of the stator core in the axial direction and suppresses the flow of the coolant to the radially inner region of the slot on one end side in the axial direction of the stator core, The rotating electrical machine according to claim 1, characterized in that the shielding portion constitutes the outflow restricting portion.

3. The rotating electrical machine according to claim 2, characterized in that the guide member is locked in contact with the stator core.

4. The rotating electrical machine according to claim 3, characterized in that the guide member is provided with a contact seat that abuts one end face of the stator core in the axial direction.

5. The first liquid chamber is partitioned by a first inner peripheral wall on the radially inner side, The second liquid chamber is partitioned by a second inner peripheral wall on the radially inner side, An annular partition wall that partitions between the inner peripheral surface of the stator core and the outer peripheral surface of the rotor is installed on the outer peripheral surface of the first inner peripheral wall and the outer peripheral surface of the second inner peripheral wall, The rotating electrical machine according to claim 2, characterized in that the shielding portion is formed on a part of the annular partition wall.

6. The portion of the slot disposed on one end side in the axial direction of the stator core is constituted by a closed slot in which the radially inner side of the stator core is closed. The rotating electrical machine according to claim 1, wherein a slot closing portion that closes the radially inner side of the closed slot constitutes the outflow restricting portion.

7. The slot axially inside the portion that is the closed slot is constituted by an open slot that opens to the inner peripheral side of the stator core, The rotating electrical machine according to claim 6, wherein the stator core is provided with a coolant discharge portion that communicates with a portion of the slots that is the open slot.

8. The rotating electrical machine according to claim 1, wherein concave grooves extending along the axial direction of the stator core are formed on opposing surfaces of the coils arranged adjacent to each other in the slot.

Images