Rotating electric machines

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 electric machine. [Background technology]

[0002] Some rotating electrical machines, such as electric motors and generators, have a rotor rotatably arranged radially inside a circular 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 each of the plurality of teeth that are adjacent in the circumferential direction. A coil is wound around each tooth through the slots arranged on both sides of the tooth.

[0003] In this type of rotating electric machine, the coils become hot during use, so it is desirable to efficiently cool the coils. One known method for efficiently cooling the coils of a rotating electric machine is to continuously flow a coolant inside the rotating electric machine case that houses the stator (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2021 / 032238 Summary of the Invention [Problem to be solved by the invention]

[0005] In the rotating electric machine described above, when a coolant is flowed inside the rotating electric machine case, a liquid chamber may be provided at each end of the stator core in the axial direction, and the slots of the stator core may be used as a passage for the coolant to flow from one liquid chamber to the other. In this case, when the coolant flows inside the slot, it can efficiently cool the periphery of the coil inside the slot.

[0006] However, if the slots are used as coolant passages, the coolant that flows out radially inward from the slots will enter the air gap between the rotor and stator, hindering smooth rotation of the rotor. For this reason, if the slots are used as coolant passages, each slot must be equipped with a complex seal structure to prevent coolant leakage. In this method, the manufacturing of the stator becomes complicated, which tends to hinder the efficiency of the production of rotating electrical machines.

[0007] Therefore, the present invention aims to provide a rotating electric machine that can suppress excessive outflow of coolant from the slots of the stator core toward the outer periphery of the rotor with a simple configuration, and ultimately contribute to energy efficiency. [Means for solving the problem]

[0008] In order to solve the above problems, the rotating electric machine according to the present invention employs the following configuration. That is, the rotating electric machine according to the present invention includes a cylindrical stator core (for example, stator core 14, 114, 314 in the embodiments) having a plurality of teeth (for example, teeth 28 in the embodiments) and a plurality of slots (for example, slot 31 in the embodiments) alternately provided on an inner periphery thereof, a stator (for example, stator 10 in the embodiments) having a plurality of coils (for example, coil 15 in the embodiments) wound around each of the teeth through the slots, a rotor (for example, rotor 11 in the embodiments) rotatably disposed radially inside the stator, a first liquid chamber (for example, first liquid chamber 21 in the embodiments) provided facing one end face of the stator core in the axial direction, and a second liquid chamber (for example, and a second liquid chamber (22) in a first state, in which the cooling liquid introduced into the first liquid chamber flows into the second liquid chamber through the plurality of slots, wherein an outflow restriction portion (e.g., a bulge portion 40, a slot closing portion 46, or a radially inner edge portion 57 in the embodiments) that restricts the outflow of the cooling liquid from the first liquid chamber to a radially inner region of the slot is provided at at least one axial end side of the stator core, and in the slot portion on the axial end side, a flow path opening area (e.g., a flow path opening area S1 in the embodiments) between the coil positioned radially innermost in the slot and the outflow restriction portion is set smaller than a flow path opening area (e.g., a flow path opening area S2 in the embodiments) between adjacent coils in the slot.

[0009] With the above configuration, the coolant in the first liquid chamber flows into the second liquid chamber through the multiple slots in the stator core, cooling the coils in the slots. At this time, the outflow restriction portion restricts the outflow of coolant from the first liquid chamber to the radially inner region of the slot at one axial end of the stator core. In the slot portion at the one axial end, the flow path opening area between the radially innermost coil and the outflow restriction portion is set smaller than the flow path opening area between adjacent coils in the slot. Therefore, the flow rate of coolant flowing from the first liquid chamber to the radially inner region of the slot is smaller than the flow rate of coolant flowing from the first liquid chamber to the second liquid chamber through the gaps between the coils. This suppresses excessive outflow of coolant from the slots in the stator core toward the outer periphery of the rotor.

[0010] Inside the first liquid chamber, a guide member (e.g., first end portion 37f, guide member 55 in the embodiment) is provided to guide the cooling liquid to the slot on one axial end side of the stator core, and the guide member abuts or is close to one axial end face of the stator core and has a shielding portion (e.g., bulge portion 40, radially inner edge portion 57 in the embodiment) that suppresses the flow of the cooling liquid to the radially inner region of the slot on one axial end side of the stator core, and the shielding portion may be configured to constitute the outflow restriction portion.

[0011] In this case, the guide member that guides the coolant into the slots at one axial end of the stator core has a shielding portion that abuts or is close to one axial end face of the stator core. This prevents the coolant from flowing toward the radially inner region of the slots at one axial end of the stator core. As a result, the flow rate of the coolant flowing from the first liquid chamber into the radially inner region of the slot is less than the flow rate of the coolant flowing from the first liquid chamber through the gaps between the coils toward the second liquid chamber. Therefore, by adopting this configuration, excessive outflow of the coolant from the slots toward the outer periphery of the rotor can be prevented without changing the shape of the slot portion of the stator core, enabling the rotating electric machine 1 to be manufactured at low cost.

[0012] The guide member may be engaged in a state of contact with the stator core.

[0013] In this case, the guide member is locked in contact with the stator core, so that the guide member and the stator core vibrate in the same phase, which reduces the likelihood of play or friction between the guide member and the stator core due to contact.

[0014] The guide member may be provided with an abutment seat (for example, the abutment seat 41 in the embodiment) that abuts against one of the end faces in the axial direction of the stator core.

[0015] In this case, when coolant flows from the first liquid chamber to the second liquid chamber through the multiple 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 toward the second liquid chamber due to the pressure difference between the coolant in the first liquid chamber and the second liquid chamber. At this time, the abutment seat of the guide member abuts against one axial end face of the stator core, and the guide member is locked to the stator core. Therefore, when this configuration is adopted, the guide member can be securely locked to the stator core even if the space for locking the guide member to the stator core is narrow. Furthermore, this configuration does not require a separate part, such as a fastener, to lock the guide member to the stator core, simplifying assembly during the manufacturing of the rotating electric machine.

[0016] The first liquid chamber is separated radially inward by a first inner circumferential wall (e.g., first inner circumferential wall 32 in the embodiment), and the second liquid chamber is separated radially inward by a second inner circumferential wall (e.g., second inner circumferential wall 35 in the embodiment), and an annular partition wall (e.g., annular partition wall 37 in the embodiment) that separates the inner circumferential surface of the stator core and the outer circumferential surface of the rotor is provided on the outer circumferential surfaces of the first inner circumferential wall and the second inner circumferential wall, and the shielding portion may be formed in a part of the annular partition wall.

[0017] In this case, the inner circumferential surface of the stator core and the rotor are separated by an annular partition wall extending between the first inner circumferential wall and the second inner circumferential wall. Therefore, even if the coolant flowing through the slots flows into the radially inner regions of the slots, the coolant does not flow onto the outer circumferential surface of the rotor. Furthermore, if the coolant flowing through the slots flows excessively into the radially inner regions of the slots, there is a concern that the annular partition wall may be pressed radially inward by the coolant and deformed. However, in this configuration, a shielding portion is formed in a portion of the annular partition wall, which prevents the coolant from excessively flowing into the radially inner regions of the slots. Therefore, when this configuration is adopted, the annular partition wall can be prevented from being pressed radially inward by the coolant and deformed.

[0018] The portion of the slot that is positioned at one end of the axial direction of the stator core may be configured as a closed slot that closes the radial inside of the stator core, and a slot closing portion (e.g., slot closing portion 46 in the embodiment) that closes the radial inside of the closed slot may constitute the outflow restriction portion.

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

[0020] The slots axially inward of the closed slot portions may be configured as open slots that open to the inner circumferential side of the stator core, and the stator core may be provided with a coolant escape portion (for example, the slit 81 and the notched groove 82 in the embodiment) that communicates with the open slot portions of the slots.

[0021] In this case, some of the coolant that passes through the closed slots at one axial end of the stator core flows out toward the outer circumferential surface of the rotor through the radially inner openings of the open slots. However, the open slots are connected to the coolant escape section of the stator core. Therefore, some of the coolant that flows into the open slots is discharged to the outside through the coolant escape section of the stator core, preventing excessive outflow toward the outer circumferential surface of the rotor.

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

[0023] In this case, the grooves are formed on the opposing surfaces of the adjacent coils in the slot, which makes it possible to easily and reliably increase the flow passage opening area between the adjacent coils. Therefore, when this configuration is adopted, the flow passage opening area between the radially innermost coil in the slot and the outflow restriction portion can be easily and reliably made smaller than the flow passage opening area between the adjacent coils. [Effects of the Invention]

[0024] In the rotating electric machine according to the present invention, in the slot portion at one axial end, the flow passage opening area between the radially innermost coil and the outflow restriction portion is set smaller than the flow passage opening area between the coils. This makes it possible to make the flow rate of coolant flowing from the first liquid chamber into the radially inner region of the slot smaller than the flow rate of coolant flowing from the first liquid chamber through the gap between the coils toward the second liquid chamber. Therefore, when the rotating electric machine according to the present invention is used, excessive outflow of coolant from the slots of the stator core toward the outer periphery of the rotor can be suppressed with a simple configuration, which ultimately contributes to energy efficiency. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a vertical cross-sectional view of a rotating electric machine according to a first embodiment. [Figure 2] FIG. 2 is an enlarged view of a portion II in FIG. 1 of the rotating electric machine according to the first embodiment. [Figure 3] 3 is a cross-sectional view of the rotating electric machine according to the first embodiment taken along line III-III in FIG. 2. [Figure 4] 4 is a cross-sectional view of a rotating electric machine according to a second embodiment, the cross-sectional view corresponding to FIG. 2 of the first embodiment. [Figure 5] 5 is a cross-sectional view of the rotating electric machine according to the second embodiment taken along line VV in FIG. 4. [Figure 6] 10 is a cross-sectional view of a rotating electric machine according to a third embodiment, the cross-sectional view corresponding to FIG. 2 of the first embodiment. [Figure 7] FIG. 10 is a vertical cross-sectional view of a rotating electric machine according to a fourth embodiment. [Figure 8] FIG. 8 is an enlarged cross-sectional view of a portion VIII of FIG. 7 of a rotating electric machine according to a fourth embodiment. [Figure 9] 9 is a cross-sectional view of the rotating electric machine according to the fourth embodiment taken along line IX-IX in FIG. 7. [Figure 10] 8 is a cross-sectional view of the rotating electric machine according to the fourth embodiment taken along line XX in FIG. 7. [Figure 11] 10 is a cross-sectional view of the rotating electric machine according to the fourth embodiment taken along line XI-XI in FIG. 8. [Figure 12] 12 is a cross-sectional view of the rotating electric machine according to the fourth embodiment taken along line XII-XII in FIG. 8. DETAILED DESCRIPTION OF THE INVENTION

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

[0027] First Embodiment FIG. 1 is a vertical cross-sectional view of a rotating electrical machine 1 according to this embodiment. The rotating electric 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 electric machine case 12. The stator 10 is fixed inside the rotating electric 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] A permanent magnet (not shown) is attached to the rotor 11 near its outer circumferential surface. The rotor 11 is supported by a rotating shaft 17 via a sleeve 16 so as to be rotatable together with the rotor 11. The rotating shaft 17 serves as an output shaft when the rotating electric machine 1 is used as a motor, and serves as a power input shaft when the rotating electric machine 1 is used as a generator. The rotating shaft 17 and the sleeve 16 are rotatably supported by the rotating electric machine case 12 via a bearing 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 perpendicular to the axial and circumferential directions is referred to as the radial direction.

[0029] An annular first side case 19 and a second side case 20 are arranged on one and the other axial ends of the stator core 14. The main parts of the first side case 19 and the second side case 20 are formed by the rotating electric machine case 12.

[0030] The first side case 19 externally covers one axial end face of the stator core 14 and the exposed portion of the coil 15 protruding from that end face. The first side case 19, together with the one axial end face of the stator core 14, forms a circular first liquid chamber 21. The first side case 19 is formed with an inlet port 24 for introducing coolant 23 into the first liquid chamber 21. The inlet port 24 is connected to a circulation circuit 25 for 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 axial end side of the stator core 14.

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

[0032] A feed pump P is connected midway through the circulation circuit 25. A heat exchanger OC that cools the coolant 23 by exchanging heat with outside air is connected to the upstream side of the feed pump P in the circulation circuit 25. The downstream side of the feed pump P is connected to the inlet port 24. Furthermore, the upstream side of the heat exchanger OC in the circulation circuit 25 is connected to the outlet port 26.

[0033] Fig. 2 is an enlarged cross-sectional view of the rotating electric machine 1 showing a part II in Fig. 1. Fig. 3 is a cross-sectional view of the rotating electric machine 1 taken along line III-III in Fig. 2. Note that in Fig. 2, the coil 15 is shown by a virtual line. Stator core 14 is formed, for example, by stacking multiple electromagnetic steel sheets in the axial direction. As shown in Fig. 3, stator core 14 is formed integrally with a cylindrical back yoke 27 and multiple teeth 28 that protrude radially inward from the inner periphery of back yoke 27. Back yoke 27 is formed so that the center of the cylinder coincides with rotation axis C.

[0034] 3, the teeth 28 are spaced apart in the circumferential direction. The teeth 28 are formed in a T-shape when viewed in the axial direction. That is, the teeth 28 are formed integrally with tooth bodies 29 that protrude radially inward from the inner periphery of the back yoke 27 and flanges 30 that protrude on both circumferential sides from the radially inner ends of the tooth bodies 29.

[0035] A slot 31 that is open radially inward is formed between circumferentially adjacent teeth 28. The slot 31 is surrounded by the mutually opposing side walls of adjacent teeth 28 and the inner circumferential wall of the back yoke 27. The side wall of each tooth 28 is formed by the side of the tooth main body 29 and the side of the flange portion 30. The portion of the slot 31 formed by the side portions of the left and right tooth main bodies 29 has a substantially constant width. Furthermore, 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 main bodies 29.

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

[0037] A 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 at the other axial end of the stator core 14. The end of each slot insertion portion (segment conductor) protruding from the slot 31 toward one axial end of the stator core 14 is joined to the end of the slot insertion portion of another segment coil by TIG welding, laser welding, or the like. This allows the multiple segment coils to form a continuous, long coil.

[0038] 3, the slot insertion portions of the multiple coils 15 inserted into the same slot 31 are arranged in a row along the radial direction. In this 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 set arbitrarily.

[0039] A gap d is provided inside each slot 31 in which multiple coils 15 are arranged, communicating one end side and the other end side in the axial direction of the stator core 14. The gap d is provided between the inner surface of the slot 31 and the multiple coils 15, and between adjacent coils 15 within the slot 31. 1, and functions to allow the coolant 23 introduced into the first liquid chamber 21 to flow toward the second liquid chamber 22. The coolant 23 flowing inside the slot 31 absorbs heat from the portion of each coil 15 that is inserted into the slot.

[0040] Furthermore, grooves 50 extending along the axial direction of the stator core 14 are formed on the surfaces of each coil 15 arranged in the slots 31 facing radially inward and outward. The grooves 50 are recessed in a generally arc-like shape toward the central region of the coil 15 in the width direction. When multiple coils 15 are arranged in the slots 31, the grooves 50 are formed on the opposing surfaces of the coils 15 that are adjacent to each other in the radial direction. Therefore, between the adjacent coils 15, the grooves 50 on the opposing surfaces ensure a flow path extending in the axial direction.

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

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

[0043] A cylindrical annular partition wall 37 is provided between 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. The annular partition wall 37 is formed, for example, from a resin material. However, the annular partition wall 37 can also be formed from other materials such as metal. The annular partition wall 37 has a first end portion 37f facing the first liquid chamber 21, a second end portion 37s facing the second liquid chamber 22, and a partition wall main body portion 37b located 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 has the same inner diameter as the partition wall main body portion 37b. A midpoint of the second end portion 37s in the extension direction is stepped down in diameter relative to the partition wall main body portion 37b.

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

[0045] The inner peripheral surface of the reduced diameter portion of the second end 37s is slidably fitted onto the outer peripheral surface of the second inner peripheral wall 35. An annular groove 38s is formed in the outer peripheral surface of the second inner peripheral wall 35, and an annular sealing member 39s such as an O-ring is fitted into the annular groove 38s. The gap between the second inner peripheral wall 35 and the second end 37s (annular partition wall 37) is liquid-tightly sealed by the sealing member 39s.

[0046] As described above, the first end 37f of the annular partition wall 37 is liquid-tightly fitted to the first inner circumferential wall 32 of the first side case 19, and the second end 37s is liquid-tightly fitted to the second inner circumferential wall 35 of the second side case 20. The annular partition wall 37 separates the radially inner region of the stator core 14 attached inside the rotating electric machine case 12 from the outer circumferential surface of the rotor 11. Therefore, even if the coolant 23 leaks from the slots 31 of the stator core 14 into the radially inner region, the coolant 23 can be prevented from flowing toward the outer circumferential surface of the rotor 11.

[0047] As shown in FIG. 2 , a bulging portion 40 is formed on the outer peripheral surface of the first end 37f of the annular partition wall 37, bulging radially outward from the outer peripheral surface of the partition wall main body 37b. The end of the bulging portion 40 facing the stator core 14 is raised radially outward in a stepped manner relative to the outer peripheral surface of the partition wall main body 37b. This raised end surface serves as an abutment seat 41 that abuts against one axial end surface of the stator core 14. The annular partition wall 37 is pressed axially toward the other end due to the difference between the pressure of the coolant 23 in the first liquid chamber 21 acting on the first end 37f and the pressure of the coolant 23 in the second liquid chamber 22 acting on the second end 37s. At this time, the abutment seat 41 is pressed against one axial end surface of the stator core 14. As a result, the annular partition wall 37 is locked in abutting contact with the stator core 14.

[0048] Here, the abutment seat 41 (bulge 40) of the first end 37f shields a part of the radially inner region of the slot 31, which opens into one axial end face of the stator core 14, from the first liquid chamber 21 side. The abutment seat 41 (bulge 40) is formed on the first liquid chamber 21 side so as to cover a predetermined height range from the radially inner end of the slot 31 to the radially outer side. Specifically, as shown in FIG. 3, the abutment seat 41 (bulge 40) is formed so that its radially outer end protrudes to a height that nearly contacts the radially inner end of the coil 15 that is positioned innermost within the slot 31 in the axial view. In this embodiment, the bulging portion 40 constitutes a blocking portion (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.

[0049] 2, 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 at the radially innermost position in the slot 31 and the bulge portion 40 (outflow restriction portion) is set smaller than the flow path opening area S2 between adjacent coils 15 in the slot 31. Specifically, between the coil 15 located at the radially innermost position and the bulge portion 40 (outflow restriction portion), a flow path opening area S1 approximately equal to 50% of the groove on one side of the coil 15 is ensured, and between adjacent coils 15, a flow path opening area S2 approximately equal to the sum of the opening areas of the two grooves on the opposing surfaces, each equal to 50% of the groove.

[0050] 3, the annular partition wall 37, which is disposed between the first side case 19 and the second side case 20 as described above, is maintained in contact with or sufficiently close to the inner peripheral surface of the stator core 14. The inner peripheral surface of the partition wall main body 37b of the annular partition wall 37 faces the outer peripheral surface of the rotor 11 with a small gap therebetween so as to be out of contact with the outer peripheral surface of the rotor 11.

[0051] In the rotating electric machine 1 having the above configuration, when a current flows continuously through the coil 15 during operation, the coil 15 generates heat and reaches a high temperature. At this time, coolant 23 is introduced from circulation circuit 25 through inlet port 24 into first liquid chamber 21 of rotating electrical machine 1. Coolant 23 introduced into first liquid chamber 21 flows within first liquid chamber 21, thereby cooling one-end regions of coils 15 exposed to the outside from one axial end side of stator core 14. The coolant 23 also flows through multiple slots 31 of stator core 14 from one axial end side to the other axial end side, and flows into second liquid chamber 22. The coolant flowing within slot 31 cools coils 15 inserted within slot 31. The coolant 23 that has flowed into second liquid chamber 22 cools the other-end regions of coils 15 exposed to the outside from the other axial end side of stator core 14, and is then returned to circulation circuit 25 through outlet port 26.

[0052] As described above, in the rotating electric machine 1, the stator 10 is always submerged in the coolant 23 inside the rotating electric machine case 12, and in this state, the coolant 23 inside the rotating electric machine case 12 is replaced through the circulation circuit 25. Therefore, the coils 15 of the stator 10 are efficiently cooled by the coolant 23.

[0053] As described above, in the rotating electric machine 1 of this embodiment, the first end 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 restriction portion) of the first end 37f restricts the outflow of the coolant 23 from the first liquid chamber 21 to the radially inner region. In the slot 31 portion on the axial end side of the stator core 14, the flow path opening area S1 between the coil 15 positioned radially innermost in the slot 31 and the bulging portion 40 (outflow restriction portion) is set to be smaller than the flow path opening area S2 between adjacent coils 15 in the slot 31. Therefore, 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 smaller than the flow rate of the coolant 23 flowing from the first liquid chamber 21 to the second liquid chamber 22 through the gaps between the coils 15. Therefore, when the rotating electric machine 1 of this embodiment is employed, it is possible to suppress, with a simple configuration, excessive outflow of the coolant 23 from the slots 31 of the stator core 14 toward the outer periphery of the rotor 11. Therefore, the rotating electric machine 1 of this embodiment can contribute to energy efficiency.

[0054] Furthermore, in the rotating electric machine 1 of this embodiment, the first liquid chamber 21 and the second liquid chamber 22 are provided with a first inner circumferential wall 32 and a second inner circumferential wall 35, respectively, and annular partition walls 37 that separate the inner circumferential surface of the stator core 14 and the outer circumferential surface of the rotor 11 are provided on the outer circumferential surfaces of the first inner circumferential wall 32 and the second inner circumferential wall 35. Therefore, even if the coolant 23 flowing through the multiple slots 31 flows out into the radially inner region of the stator core 14, the coolant 23 does not flow onto the outer circumferential surface of the rotor 11. Therefore, when this configuration is adopted, it is possible to prevent the coolant 23 from interfering with the rotation of the rotor 11. If the coolant flowing through the multiple slots 31 excessively flows into the radially inner regions of the slots 31, there is a concern that the annular partition wall 37 may be pressed radially inward by the coolant 23 and deformed. However, in the rotating electric machine 1 of this embodiment, a bulge 40 (outflow restriction portion) is provided on one axial end side of the annular partition wall 37, and the bulge 40 suppresses excessive outflow of the coolant 23 into the radially inner regions of the slots 31. Therefore, when the rotating electric machine 1 of this embodiment is employed, it is possible to prevent the annular partition wall 37 from being pressed radially inward by the coolant 23 and deforming. As a result, it is possible to maintain stable rotation performance of the rotating electric machine 1 for a long period of time.

[0055] Furthermore, in the rotating electric machine 1 of this embodiment, the first end 37f of the annular partition wall 37 functions as a guide member that guides the coolant 23 to the slot 31 portion on one axial end side of the stator core 14. Furthermore, the bulge 40 provided at the first end 37f abuts on or is close to one axial end face of the stator core 14 and functions as a shielding portion (outflow restricting portion) that restricts the flow of the coolant 23 toward 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 this embodiment is adopted, excessive outflow of the coolant from the slot 31 toward the outer periphery of the rotor 11 can be restricted without changing the shape of the slot 31 portion of the stator core 14. As a result, the rotating electric machine 1 can be manufactured at low cost.

[0056] Furthermore, in the rotating electric machine 1 of this embodiment, the first end 37f (guide member) of the annular partition wall 37 is configured to be engaged in abutting 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 37b of the annular partition wall 37 is brought close to the inner circumferential surface of the stator core 14, rattle and friction due to contact between the annular partition wall 37 and the stator core 14 are unlikely to occur. Note that the partition wall main body 37b of the annular partition wall 37 may be brought into contact with the inner circumferential surface of the stator core 14. Therefore, when the rotating electric machine 1 of this embodiment is adopted, the air gap between the stator core 14 and the rotor 11 can be narrowed to charge without causing abnormal noise or deterioration of components due to friction, thereby improving the magnetic performance of the rotating electric machine 1.

[0057] In the rotating electric machine 1 of this embodiment, an abutment seat 41 that abuts against one axial end face of the stator core 14 is provided at the first end 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 multiple slots 31, the liquid pressure in the first liquid chamber 21 becomes higher than the liquid pressure in the second liquid chamber 22. Therefore, the first end 37f of the annular partition wall 37 is pressed toward the second liquid chamber 22 due to the pressure difference between the coolant 23 in the first liquid chamber 21 and the second liquid chamber 22. In the rotating electric machine 1 of this embodiment, the abutment seat 41 of the first end 37f abuts against the axial end face of the stator core 14, thereby locking the first end 37f to the stator core 14. Therefore, when the rotating electric machine 1 of this embodiment is employed, even if the space for engaging the first end 37f (guide member) with the stator core 14 is narrow, the first end 37f can be reliably engaged with the stator core 14. Furthermore, in this case, no separate part such as a fastening member is required to engage the first end 37f with the stator core 14, which also facilitates assembly work during manufacturing of the rotating electric machine 1.

[0058] Furthermore, in the rotating electric machine 1 of this embodiment, recessed grooves 50 extending along the axial direction of the stator core 14 are formed in the opposing surfaces (surfaces facing the radial direction of the stator core 14) of the coils 15 arranged adjacent to each other in the slots 31. This makes it possible to easily and reliably increase the flow path opening area S2 between the coils 15 arranged adjacent to each other in the slots 31. Therefore, when this configuration is adopted, it is possible to easily and reliably make the flow path opening area S1 between the coil 15 located most radially inward in the slots 31 and the bulging portion 40 of the annular partition wall 37 smaller than the flow path opening area S2 between the adjacent coils 15.

[0059] Second Embodiment Fig. 4 is a cross-sectional view of the rotating electric machine 101 of this embodiment, corresponding to Fig. 2 of the first embodiment. Fig. 5 is a cross-sectional view of the rotating electric machine 101 of this embodiment taken along line VV in Fig. 4. In the rotating electric machine 101 of this embodiment, among the multiple steel plates 45 constituting the stator core 114, the shape of the slot 31e of the steel plate 45e at one axial end side (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 generally similar to that of the first embodiment described above.

[0060] The slots 31e of the steel plate 45e at one axial end are closed slots that are closed radially inward of the stator core 114. That is, the radially inner ends of the coil insertion portions of the slots 31e that extend radially are closed by slot closing portions 46. Therefore, the ends of the slots 31e are not open on the inner peripheral surface of the steel plate 45e at one axial end. The inner peripheral surface of the steel plate 45e has a continuous peripheral shape.

[0061] A partition wall main body 37b of the annular partition wall 37 is fitted onto the inner peripheral surface of the steel plate 45e. In this embodiment, a first end 37f of the annular partition wall 37, which functions as a guide member, is locked in contact with the inner peripheral surface of the stator core 114 via the partition wall main body 37b.

[0062] The slot blocking portion 46 of the steel plate 45e on one axial end side forms an outflow restriction portion at one axial end of the stator core 114 that restricts the outflow of coolant from the first liquid chamber 21 to the radially inner region of the slot 31. The slots 31 of the steel plates 45 other than the steel plate 45e on one axial end side are configured as open slots that open radially inward. In this embodiment, only one steel plate 45e at one axial end side is formed as a closed slot, but a plurality of steel plates 45 at one axial end side may be formed as closed slots.

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

[0064] As described above, in the rotating electric machine 101 of this embodiment, in the slot 31e portion on one axial end side of the stator core 114, the flow path opening area S1 between the coil 15 located radially innermost in the slot 31e and the slot closing portion 46 (outflow restriction portion) is set to be smaller than the flow path opening area S2 between adjacent coils 15 in the slot 31. Therefore, 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 to the second liquid chamber side. Therefore, when the rotating electrical machine 101 of this embodiment is employed, excessive outflow of the coolant from the slots 31 of the stator core 114 toward the outer periphery of the rotor 11 can be suppressed with a simple configuration.

[0065] Furthermore, the rotating electric machine 101 of this embodiment has a configuration that is roughly 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, and therefore can achieve the same effects as those of the first embodiment described above.

[0066] Third Embodiment FIG. 6 is a cross-sectional view of a rotating electric machine 201 according to this embodiment, corresponding to FIG. 2 of the first embodiment. In the rotating electric machine 201 of this embodiment, the slots 31 of the stator core 14 are open slots that open radially inward for all steel plates, as in the first embodiment. The rotating electric machine 201 of this embodiment does not have the annular partition wall 37 as in the first and second embodiments. In the rotating electric machine 201, an annular guide member 55 is fitted and engaged with the first inner circumferential wall 32 (cylindrical member 34) facing the inside of the first liquid chamber 21. The guide member 55 is formed, for example, from a resin material.

[0067] The guide member 55 includes a cylindrical wall 55a fitted to the outer peripheral surface of the first inner peripheral wall 32 (cylindrical member 34), and a flange wall 55b extending radially outward from an end of the cylindrical wall 55a facing the end face of the stator core 14. A plurality of coil insertion holes 56 are formed in the flange wall 55b, penetrating the flange wall 55b in the plate thickness direction. The coil insertion holes 56 are generally rectangular holes extending radially and are formed at positions corresponding to the plurality of slots 31 of the stator core 14. Ends of the plurality of coils 15 inserted in 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. The flange wall 55b abuts against one axial end face of the stator core 14 (the end face facing the first liquid chamber 21).

[0068] A radially inner edge 57 of each coil insertion hole 56 in the flange wall 55b abuts against the inner peripheral edge of the end face of the stator core 14. Therefore, the edge 57 of each coil insertion hole 56 shields the radially inner region of the corresponding slot 31 of the stator core 14 from the first liquid chamber 21 side. In this embodiment, a radially inner edge 57 of the flange wall 55b of the guide member 55, which is located on the radially inner side of the coil insertion hole 56, constitutes a shielding portion (outflow restriction portion). The radially inner edge 57 of the coil insertion hole 56 restricts the outflow of the coolant from the first liquid chamber 21 to the radially inner region of the slot 31. The guide member 55 also functions to guide the coolant inside the first liquid chamber 21 to the slot 31 on one axial end side of the stator core 14.

[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 positioned radially innermost in the slot 31 and the radially inner edge 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 adjacent coils 15 in the slot 31.

[0070] As described above, in the rotating electric machine 201 of this 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. Therefore, 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 to the second liquid chamber side. Therefore, when the rotating electrical machine 201 of this embodiment is employed, excessive outflow of the coolant from the slots 31 of the stator core 14 toward the outer periphery of the rotor 11 can be suppressed with a simple configuration. In the present embodiment, since no annular partition is disposed between the inner peripheral surface of the stator core 14 and the outer peripheral surface of the rotor 11, some of the coolant that flows out radially inside the slots 31 may flow toward the outer peripheral surface of the rotor 11. However, in the present embodiment, the flow rate of the coolant flowing out from the first liquid chamber 21 to the radially inner region of the slots 31 is restricted by the edge portions 57 of the guide member 55 (flow path opening area S1 < flow path opening area S2), so it is possible to prevent the coolant from flowing out excessively toward the outer peripheral surface of the rotor 11, thereby preventing the coolant from interfering with the rotation of the rotor 11.

[0071] <Fourth embodiment> Fig. 7 is a longitudinal cross-sectional view of a rotating electric machine 301 of this embodiment, and Fig. 8 is an enlarged cross-sectional view of part VIII in Fig. 7. Fig. 9 is a cross-sectional view taken along line IX-IX in Fig. 7, and Fig. 10 is a cross-sectional view taken along line XX in Fig. 7. Fig. 11 is a cross-sectional view taken along line XI-XI in Fig. 8, and Fig. 12 is a cross-sectional view taken along line XII-XII in Fig. 8. In a rotating electric machine 301 of this embodiment, as in the first embodiment, a stator 10 and a rotor 11 are housed inside a rotating electric machine case 12, and the stator 10 is fixed inside the rotating electric machine case 12 with bolts 13. The rotor 11 is supported by a rotating shaft 17 via a sleeve 16 so as to be integrally rotatable with the rotating electric machine. The rotating shaft 17 is also rotatably supported by the rotating electric machine case 12 via a bearing 18. A supply passage 76 for a coolant 23 (lubricating liquid) is provided in the axial center of the rotating shaft 17. A supply hole 77 is formed radially through the rotating shaft 17 near the support position of the bearing 18 to 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 stacking a plurality of steel plates 45 (electromagnetic steel plates) in the axial direction. 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 that protrude radially inward from the inner periphery of the back yoke 27. Slots 31 are formed between the teeth 28 that are adjacent 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 one axial end face of the stator core 314 and the exposed portion of the coil 15 protruding from that end face. The first side case 19, together with one axial end face of the stator core 314, forms an annular first liquid chamber 21. The second side case 20 externally covers the other axial end face of the stator core 314 and the exposed portion of the coil 15 protruding from that end face. The second side case 20, together with the other axial end face of the stator core 314, forms an annular second liquid chamber 22. The first side case 19 is formed with an inlet port 24 for introducing the coolant 23 into the first liquid chamber 21, and the second side case 20 is formed with an outlet port 26 for discharging the coolant 23 in the second liquid chamber 22 to the outside. The inlet port 24 and the outlet port 26 are connected to a circulation circuit 25. The coolant introduced from the circulation circuit 25 into the first liquid chamber 21 flows through the slot 31 of the stator core 314 into the second liquid chamber 22 while cooling the coil 15, and is returned from the second liquid chamber 22 to the circulation circuit 25 via the discharge port 26.

[0074] 8 and 9, of the steel plates 45 constituting the stator core 314, the steel plate 45e arranged at one end in the axial direction has a slot 31e (31) configured as a closed slot. That is, the slot 31e of the steel plate 45e at the end has a radially inner end of a coil insertion portion extending along the radial direction, which is closed by a slot closing portion 46. The remaining steel plates 45a, 45b, and 45c constituting the stator core 314 are configured as open slots that open radially inward.

[0075] 9 and 10, the coils 15 inserted into the slots 31 of the stator core 314 are made of rectangular wire with a substantially rectangular cross section. Each coil 15 has a groove 50 extending along the axial direction of the stator core 314 formed on the surface facing radially when inserted into the slot 31. A gap d is provided between the slot 31 and the coil 15 and between adjacent coils 15 to allow the coolant 23 to flow from the first liquid chamber 21 to the second liquid chamber 22.

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

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

[0078] The guide member 355 extends from one axial end 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 forms an annular partition wall that separates the radially inner region of the first liquid chamber 21.

[0079] 8, the inner circumferential surface of steel plate 45e at the axial end of stator core 314 is formed to have a larger diameter than the inner circumferential surfaces of the other steel plates 45a, 45b, and 45c. More specifically, the inner circumferential surface of steel plate 45e is formed to have a larger diameter than the inner circumferential surfaces of the other steel plates 45a, 45b, and 45c by the thickness of thin-walled end 355b of guide main body 355a. As a result, a gap of the same width as gap 80 between the inner circumferential surfaces of the other steel plates 45a, 45b, and 45c of stator core 314 and the outer circumferential surface of rotor 11 is secured between the inner circumferential surface of end 355b of guide main body 355a and the outer circumferential surface of rotor 11.

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

[0081] As shown in FIGS. 8 and 12 , a notched groove 82 that opens toward the outer circumferential surface of the stator core 314 is formed in the steel plate 45b that is adjacent to the steel plate 45a of the stator core 314 on the axially inner side. The notched groove 82 opens vertically downward below the rotating shaft 17. The notched groove 82 also communicates with a plurality of slits 81 in the adjacent steel plate 45a. The plurality of slits 81 and the notched groove 82 form a coolant escape portion for discharging the coolant 23 that has flowed into a gap 80 between the inner circumferential surface of the stator core 314 and the outer circumferential 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 circumferential surface of the stator core 314 and the outer circumferential surface of the rotor 11 is discharged to the bottom of the rotating electric machine case 12 through the slits 81 and the notched groove 82. As shown in Figure 8, the coolant 23 that has lubricated the bearing 18 through the supply passage 76 and supply hole 77 of the rotating shaft 17 is guided to the guide body 355a of the guide member 55 and is discharged to the bottom of the rotating electric machine case 12 through the gap 80, the slit 81, and the notched groove 82.

[0082] As described above, in the rotating electric machine 301 of this 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 radially innermost in the slot 31e and the slot closing portion 46 (outflow restriction portion) is set to be smaller than the flow path opening area S2 between adjacent coils 15 in the slot 31. Therefore, 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 to the second liquid chamber side through the gap between the coils 15. Therefore, when the rotating electrical machine 301 of this embodiment is employed, excessive outflow of the coolant 23 from the slots 31 of the stator core 314 toward the outer periphery of the rotor 11 can be suppressed.

[0083] Furthermore, in the rotating electric machine 301 of this embodiment, the slots 31 formed in the steel plates 45a, 45b, and 45c other than the steel plate 45e at one axial end of the stator core 314 are configured as open slots that open radially inward. Therefore, some of the coolant 23 that flows out radially inward of the slot 31 may flow into the gap 80 between the inner circumferential surface of the stator core 314 and the outer circumferential surface of the rotor 11. However, in this embodiment, the flow rate of the coolant flowing out from the first liquid chamber 21 to the radially inner region of the slot 31 is throttled by the slot closure portion 46 of the steel plate 45e at the end (flow path opening area S1<flow path opening area S2), so the amount of coolant 23 that flows out toward the outer circumferential surface of the rotor 11 can be suppressed.

[0084] Furthermore, in the rotating electric machine 301 of this embodiment, slits 81 and notched grooves 82 serving as coolant escape portions are provided in some of the steel plates 45a, 45b that are open slots. Therefore, some of the coolant that passes through the closed slots at one axial end of the stator core 314 is discharged to the outside through the slits 81 and notched grooves 82 provided in some of the steel plates 45a, 45b. Therefore, when the rotating electric machine 301 of this embodiment is employed, it is possible to more reliably prevent the coolant 23 that has flowed into the open slots of the stator core 314 from excessively flowing out toward the outer circumferential surface of the rotor 11.

[0085] In particular, in the rotating electric machine 301 of this embodiment, the slits 81 and the notched grooves 82 are provided in the open-slot steel plates 45a, 45b at positions below the rotating shaft 17 so as to extend vertically downward. Therefore, the gravity acting on the coolant 23 can be used to reliably discharge excess coolant 23 to the outside of the stator core 314. Furthermore, 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 the notched grooves 82.

[0086] Furthermore, the rotating electric machine 301 of this embodiment employs a configuration 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. With this configuration, the radially inner region of the first liquid chamber 21 can be separated by the guide member 355 without providing an inner peripheral wall on the first side case 19 side, which is difficult to manufacture. Therefore, when this configuration is employed, the manufacturing of the rotating electric machine case 12 can be facilitated.

[0087] The present invention is not limited to the above-described embodiments, and various design modifications are possible without departing from the spirit of the present invention. For example, in the above-described fourth embodiment, the coolant escape portion is formed by a plurality of slits 81 and notched grooves 82, but the configuration of the coolant escape portion is not limited to slits 81 and notched grooves 82. The coolant escape portion may be any portion that can discharge a portion of the coolant 23 to the outside from the open slits, and may be, for example, a configuration of only slots or only notched grooves. [Explanation of symbols]

[0088] 1,101,201,301...Rotating electric machines 10...Stator 11...Rotor 14,114,314... Stator core 15...Coil 21...1st liquid chamber 22…Second liquid chamber 28...Teeth 31,31e…Slot 32...First inner peripheral wall 35…Second inner peripheral wall 37...Annular bulkhead 37f...First end (guide member) 40...Bulging part (shielding part, outflow control part) 41...Abutting seat 46...Slot blocking portion (outflow restriction portion) 50...Groove 55...Guide member 57... Radial inner edge (shielding portion, outflow control portion) 81...Slit (coolant escape area) 82...Notched groove (coolant escape area) 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 periphery thereof, and a plurality of coils wound around each of the teeth through the slots; a rotor rotatably disposed radially inside the stator; a first fluid chamber provided facing one end face of the stator core in the axial direction; a second fluid chamber provided facing the other end face of the stator core in the axial direction, a rotating electric machine in which the coolant introduced into the first liquid chamber flows into the second liquid chamber through the plurality of slots, an outflow restriction portion that restricts outflow of the cooling liquid to a region radially inward of the first liquid chamber is provided on at least one axial end side of the stator core; In a portion of the slot formed on one end side of the stator core in the axial direction, a flow path opening area between the coil positioned most radially inside in the slot and the outflow restriction portion is set to be smaller than a flow path opening area between adjacent coils in the slot, a guide member provided inside the first liquid chamber to guide the cooling liquid to the slot at one end of the stator core in the axial direction; the guide member has a shielding portion that abuts against or is close to one axial end face of the stator core and that suppresses the flow of the cooling liquid toward a radially inner region of the first liquid chamber on the one axial end side of the stator core, The rotating electric machine is characterized in that the outflow regulation portion includes the shielding portion.

2. 2. The rotating electric machine according to claim 1, wherein the guide member is locked in a state of contact with the stator core.

3. 3. The rotating electric machine according to claim 2, wherein the guide member is provided with an abutment seat that abuts against one of the end faces of the stator core in the axial direction.

4. The first fluid chamber is separated radially inward by a first inner peripheral wall, The second fluid chamber is separated radially inward by a second inner peripheral wall, an annular partition wall is provided between an outer peripheral surface of the first inner peripheral wall and an outer peripheral surface of the second inner peripheral wall, the annular partition wall separating an inner peripheral surface of the stator core and an outer peripheral surface of the rotor; 2. The rotating electric machine according to claim 1, wherein the shielding portion is formed in a part of the annular partition wall.

5. a portion of the slot that is arranged on one end side of the stator core in the axial direction is configured as a closed slot that is closed on an inner side in the radial direction of the stator core, 2. The rotating electric 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.

6. the slots axially inward of the closed slots are configured as open slots that open to an inner peripheral side of the stator core, 6. The rotating electric machine according to claim 5, wherein the stator core is provided with a coolant escape portion that communicates with the open slot portion of the slots.

7. 2. The rotating electric machine according to claim 1, wherein a recessed groove extending along the axial direction of the stator core is formed on the opposing surfaces of the coils arranged adjacent to each other in the slot.

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