Rotating electric machine

Abstract

The invention provides a rotating electrical machine. A rotating electrical machine is provided with a stator (10), a rotor (11), a first liquid chamber (21), and a second liquid chamber. The stator (10) has a stator core (14) and a coil (15). A stator core (14) is provided with a plurality of teeth and a plurality of slots (31) alternately on the inner peripheral portion thereof. The cooling liquid introduced into the first liquid chamber (21) flows into the second liquid chamber through the plurality of slots (31). At least one axial end side of the stator core (14) is provided with an outflow restricting part for restricting the outflow of the cooling liquid from the first liquid chamber (21) to the radially inner region of the slot (31). In a portion of the slot (31) on one end side in the axial direction, a flow path opening area (S1) between the coil (15) located closest to the radial inner side and the outflow restricting portion is set to be smaller than a flow path opening area (S2) between adjacent coils (15) in the slot (31).

Description

Technical Field

[0001] The present invention relates to rotating electrical machines. Background Art

[0002] A rotating electric machine such as an electric motor or a generator has the following structure: a rotatable rotor is arranged radially inside a ring-shaped stator. The stator has a stator core and a coil wound around the stator core. The stator core is formed integrally with, for example, a cylindrical back yoke and a plurality of teeth protruding radially inward from the back yoke. Slots are respectively formed between a plurality of teeth adjacent to each other in the circumferential direction. The coil is wound around each tooth through the slots arranged on both sides of the tooth.

[0003] In such a rotating electric machine, the coil becomes hot during use, so it is desirable to efficiently cool the coil. As a method for efficiently cooling the coil of a rotating electric machine, a method of continuously flowing a coolant inside a rotating electric machine housing that houses a stator is known (for example, see International Publication No. 2021 / 032238). Summary of the invention

[0004] In the above-mentioned rotating electrical machine, when the coolant is made to flow in the rotating electrical machine housing, there is a case where liquid chambers are provided at one end side and the other end side of the stator core in the axial direction, respectively, and the slot of the stator core is used as a passage for the coolant to flow from the one liquid chamber to the other liquid chamber. In this case, when the coolant flows in the slot, the surrounding area of ​​the coil in the slot can be efficiently cooled.

[0005] However, if the slots are used as the passages for the coolant to flow, the coolant flowing radially inward from the slots enters the air gap between the rotor and the stator, which will hinder the smooth rotation of the rotor. Therefore, when the slots are used as the passages for the coolant to flow, a complex sealing structure is required to be provided in each slot to prevent the coolant from leaking.

[0006] In the case of this method, the manufacturing of the stator becomes complicated, which tends to hinder the efficiency of the production of the rotating electrical machine.

[0007] An aspect of the present invention is to provide a rotating electrical machine which can suppress excessive outflow of a coolant from a slot of a stator core toward the outer circumference of a rotor with a simple structure, thereby contributing to improvement of energy efficiency.

[0008] A rotating electric machine according to one embodiment of the present invention comprises: a stator having a cylindrical stator core with a plurality of teeth and a plurality of slots alternately provided on an inner circumference thereof, and a plurality of coils wound around each of the teeth through the slots; a rotor rotatably arranged on the radially inner side of the stator; a first liquid chamber provided on an end face facing one axial direction of the stator core; and a second liquid chamber provided on an end face facing the other axial direction of the stator core, wherein a coolant introduced into the first liquid chamber flows into the second liquid chamber through the plurality of slots, wherein an outflow restriction portion for restricting the outflow of the coolant from the first liquid chamber to a radially inner region of the slot is provided on at least one axial end side of the stator core, and in a slot portion on one axial end side, a flow path opening area between the coil located most radially inward in the slot and the outflow restriction portion is set smaller than a flow path opening area between the coils adjacent to each other in the slot.

[0009] Through the above structure, the coolant in the first liquid chamber flows into the second liquid chamber through the multiple slots of the stator core, and the coils in the slots are cooled by the coolant. At this time, at one axial end side of the stator core, the outflow restriction portion restricts the coolant from flowing out from the first liquid chamber to the radial inner area of ​​the slot. In the slot portion at one axial end side, the flow path opening area between the coil located at the radially innermost position and the outflow restriction portion is set smaller than the flow path opening area between the adjacent coils in the slot. Therefore, the flow rate of the coolant flowing from the first liquid chamber to the radial inner area of ​​the slot is less 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, it is possible to suppress the excessive outflow of the coolant from the slot of the stator core to the outer peripheral direction of the rotor.

[0010] The above-mentioned rotating electric machine may also be provided with a guide member inside the first liquid chamber for guiding the coolant to the slot on one axial end side of the stator core, the guide member having a shielding portion, the shielding portion abutting or approaching an end face on one axial side of the stator core to suppress the coolant from flowing to the radial inner region of the slot on one axial end side of the stator core, the shielding portion constituting the outflow restricting portion.

[0011] In this case, the shielding portion of the guide member that guides the coolant to the slot on one axial end side of the stator core is in contact with or close to the end face of one axial side of the stator core. As a result, the flow of the coolant to the radial inner area of ​​the slot on one axial end side of the stator core is suppressed by the shielding portion. As a result, the flow rate of the coolant flowing from the first liquid chamber to the radial inner area of ​​the slot is less 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 this structure is adopted, the excessive outflow of the coolant from the slot to the outer peripheral direction of the rotor can be suppressed without changing the shape of the slot part of the stator core, and the rotating electric machine can be manufactured at a low cost.

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

[0013] In this case, since the guide member is locked to the stator core in a contacting state with the stator core, the guide member and the stator core vibrate in the same phase, so that rattling and friction due to contact are unlikely to occur between the guide member and the stator core.

[0014] The guide member may be provided with a contact seat that contacts the one axial end surface of the stator core.

[0015] In this case, when the coolant flows from the first liquid chamber to the second liquid chamber through a plurality of slots, the hydraulic pressure in the first liquid chamber is higher than the hydraulic 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 coolant in the second liquid chamber. At this time, the abutment seat of the guide member abuts against the end face of one axial side of the stator core, and the guide member is clamped to the stator core. Therefore, when this structure is adopted, even if the space for clamping the guide member to the stator core is narrow, the guide member can be reliably clamped to the stator core. In addition, in this structure, other components such as fastening members for clamping the guide member to the stator core are not required, so the assembly work during the manufacture of the rotating motor is also facilitated.

[0016] Alternatively, the radial inner side of the first liquid chamber is separated by a first inner circumferential wall, and the radial inner side of the second liquid chamber is separated by a second inner circumferential wall, and an annular partition wall is provided on the outer circumferential surface of the first inner circumferential wall and the outer circumferential surface of the second inner circumferential wall to separate the inner circumferential surface of the stator core and the outer circumferential surface of the rotor, and the shielding portion is formed on a portion 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 provided on the first inner circumferential wall and the second inner circumferential wall. Therefore, even if the coolant flowing in the multiple slots flows out to the radial inner area of ​​the slots, the coolant will not flow into the outer circumferential surface of the rotor. In addition, when the coolant flowing in the multiple slots flows out excessively to the radial inner area of ​​the slots, there is a concern that the annular partition wall may be pressed radially inward by the coolant and deformed. However, in the present structure, a shielding portion is formed on a portion of the annular partition wall, so that the excessive outflow of the coolant to the radial inner area of ​​the slot is suppressed by the shielding portion. Therefore, when the present structure is adopted, it is possible to suppress the annular partition wall from being pressed radially inward by the coolant and deformed.

[0018] Alternatively, a portion of the slot disposed on one axial end side of the stator core may be composed of a closed slot closed radially inwardly of the stator core, and a slot blocking portion closing the radially inwardly of the closed slot may constitute the outflow restricting portion.

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

[0020] Alternatively, the slot located axially inward of the portion serving as the closed slot may be an open slot opening toward the inner circumference of the stator core, and the stator core may be provided with a coolant discharge portion communicating with the portion of the slot serving as the open slot.

[0021] In this case, a portion of the coolant that has passed through the closed slot at one axial end side of the stator core flows out toward the outer peripheral surface of the rotor through the radially inner opening of the open slot. However, the portion that is the open slot is connected to the coolant discharge portion of the stator core. Therefore, a portion of the coolant that has flowed into the open slot is discharged to the outside through the coolant discharge portion of the stator core, and excessive outflow to the outer peripheral surface side of the rotor is suppressed.

[0022] A groove extending in the axial direction of the stator core may be formed on opposing surfaces of the coils adjacently arranged in the slot.

[0023] In this case, since 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 reliably expanded. Therefore, when this structure is adopted, the flow path opening area between the coil located at the radially innermost position in the slot and the outflow restriction portion can be easily and reliably reduced relative to the flow path opening area between the adjacent coils.

[0024] In the rotating electric machine of the solution of the present invention, in the slot portion on one end side in the axial direction, the flow path opening area between the coil at the radially innermost position and the outflow restriction portion is set smaller than the flow path opening area between the coils. Therefore, the flow rate of the coolant flowing from the first liquid chamber to the radially inner area 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, in the case of a rotating electric machine adopting the solution of the present invention, the excessive outflow of the coolant from the slot of the stator core to the outer peripheral direction of the rotor can be suppressed by a simple structure, which can contribute to energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a longitudinal sectional view of the rotating electrical machine according to the first embodiment.

[0026] Figure 2 The rotating electrical machine of the first embodiment Figure 1 An enlarged view of Part II.

[0027] Figure 3 The rotating electrical machine of the first embodiment is Figure 2 Cross-sectional view along line III-III.

[0028] Figure 4 The rotating electrical machine of the second embodiment is different from the first embodiment. Figure 2 The corresponding cross-sectional view.

[0029] Figure 5 The rotating electrical machine of the second embodiment is Figure 4 A cross-sectional view of line VV.

[0030] Figure 6 The rotating electrical machine of the third embodiment is different from the first embodiment. Figure 2 The corresponding cross-sectional view.

[0031] Figure 7 It is a longitudinal sectional view of a rotating electrical machine according to a fourth embodiment.

[0032] Figure 8 The rotating electrical machine of the fourth embodiment Figure 7 An enlarged cross-sectional view of part VIII.

[0033] Fig. 9 The rotating electrical machine of the fourth embodiment is Figure 7 A cross-sectional view taken along line IX-IX.

[0034] Fig.10 The rotating electrical machine of the fourth embodiment is Figure 7 Cross-sectional view of line XX.

[0035] Fig.11 The rotating electrical machine of the fourth embodiment is Figure 8 A cross-sectional view taken along line XI-XI.

[0036] Fig.12 The rotating electrical machine of the fourth embodiment is Figure 8 A cross-sectional view taken along line XII-XII. DETAILED DESCRIPTION

[0037] Hereinafter, various embodiments of the present invention will be described based on the drawings. It should be noted that in various embodiments described below, the same reference numerals are given to common parts, and some overlapping descriptions are omitted.

[0038] <First Embodiment>

[0039] Figure 1 It is a longitudinal sectional view of the rotating electrical machine 1 according to the present embodiment.

[0040] The rotary electric machine 1 of the present embodiment includes a stator 10 and a rotor 11. The stator 10 and the rotor 11 are accommodated in a rotary electric machine housing 12. The stator 10 is fixed in the rotary electric machine housing 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 arranged radially inside the stator core 14 (stator 10).

[0041] The rotor 11 has a permanent magnet (not shown) mounted near the outer peripheral surface. In addition, the rotor 11 is supported by the rotating shaft 17 via the sleeve 16 so as to be rotatable as a whole. The rotating shaft 17 becomes an output shaft when the rotating electrical machine 1 is used as a motor. The rotating shaft 17 becomes a power input shaft when the rotating electrical machine 1 is used as a generator. The rotating shaft 17 and the sleeve 16 are supported by the rotating electrical machine housing 12 in a rotatable manner via the bearing 18.

[0042] In the following description, a direction parallel to the rotation axis C of the rotor 11 is referred to as an axial direction, a rotation direction of the rotor 11 is referred to as a circumferential direction, and a radial direction of the rotor 11 orthogonal to the axial direction and the circumferential direction is referred to as a radial direction.

[0043] An annular first side case 19 and a second side case 20 are disposed at one end and the other end in the axial direction of the stator core 14 . Major portions of the first side case 19 and the second side case 20 are formed by the rotating electrical machine case 12 .

[0044] The first side housing 19 covers one axial end face of the stator core 14 and the exposed portion of the coil 15 protruding from the end face from the outside. The first side housing 19 forms an annular first liquid chamber 21 together with one axial end face of the stator core 14. An inlet port 24 for introducing a coolant 23 into the first liquid chamber 21 is formed on the first side housing 19. The inlet 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 flows into the other axial end side of the stator core 14 through the inside of the stator core 14.

[0045] The second side housing 20 covers the other axial end face of the stator core 14 and the exposed portion of the coil 15 protruding from the end face from the outside. The second side housing 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. A discharge port 26 for discharging the coolant 23 in the second liquid chamber 22 to the outside is formed on the second side housing 20. 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 returns to the circulation circuit 25 from the discharge port 26.

[0046] The circulation loop 25 is connected to a feed pump P in the middle of the loop. A heat exchanger OC is connected to the upstream side of the feed pump P in the circulation loop 25, and the heat exchanger OC cools the coolant 23 by exchanging heat with the external air. The downstream side of the feed pump P is connected to the inlet port 24. In addition, the upstream side of the heat exchanger OC in the circulation loop 25 is connected to the outlet port 26.

[0047] Figure 2 The rotating motor 1 Figure 1 An enlarged cross-sectional view of part II. Figure 3 The rotating motor 1 is along Figure 2 It should be noted that in Figure 2 In FIG. 1 , the coil 15 is indicated by an imaginary line.

[0048] The stator core 14 is formed, for example, by laminating a plurality of electromagnetic steel sheets in the axial direction. Figure 3As shown, 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 circumference of the back yoke 27. The back yoke 27 is formed so that the center of the cylinder coincides with the rotation axis C.

[0049] like Figure 3 As shown, the teeth 28 are arranged at intervals in the circumferential direction. When viewed from the axial direction, the teeth 28 are formed into a T-shape. That is, the teeth 28 are integrally formed with a tooth body 29 protruding radially inward from the inner circumference of the back yoke 27 and a flange portion 30 extending from the radial inner end of the tooth body 29 to both sides of the circumferential direction.

[0050] A slot 31 opened radially inward is formed between teeth 28 adjacent in the circumferential direction. The slot 31 is formed by the mutually opposing side walls of the adjacent teeth 28 and the inner peripheral wall of the back yoke 27. The side wall of each tooth 28 is formed by the side of the tooth body 29 and the side of the flange 30. The portion of the slot 31 formed by the side of the left and right tooth bodies 29 is substantially formed to have a constant width. In addition, the width of the portion of the slot 31 formed by the side of the left and right flange 30 is narrower than the width of the portion formed by the side of the left and right tooth bodies 29.

[0051] The coil 15 is provided with three phases, for example, U phase, V phase, and W phase. The coil 15 is formed by connecting a plurality of segment coils to each other, for example. The core wire of the segment coil is covered with an insulating film. The segment coil is formed of a flat wire. That is, the cross-sectional shape along the radial direction in each segment coil is substantially formed into a rectangular shape.

[0052] The segment coil is a coil element in which two slot insertion portions (segment conductors) passing through adjacent slots 31 on the stator core 14 are integrally connected at the other axial end side of the stator core 14. The end of each slot insertion portion (segment conductor) protruding from the slot 31 to one axial end side of the stator core 14 is joined to the end of the slot insertion portion of the other segment coil by TIG welding or laser welding. Thus, a plurality of segment coils constitute a continuous long coil.

[0053] like Figure 3 As shown, the slot insertion portions of the plurality of coils 15 passing through the same slot 31 are arranged in a row along the radial direction. In the present embodiment, for example, five coils 15 pass through the same slot 31. However, the number of coils 15 passing through the same slot 31 is not limited thereto and can be set arbitrarily.

[0054] A gap d is secured inside each slot 31 where the plurality of coils 15 are arranged, communicating with one axial end and the other axial end of the stator core 14. The gap d is secured between the inner surface of the slot 31 and the plurality of coils 15 and between adjacent coils 15 in the slot 31.

[0055] The gap d is such that Figure 1 The gap connecting the first liquid chamber 21 and the second liquid chamber 22 acts to allow the coolant 23 introduced into the first liquid chamber 21 to flow toward the second liquid chamber 22. The coolant 23 flowing in the slot 31 absorbs heat from the slot insertion portion of each coil 15.

[0056] In addition, grooves 50 extending along the axial direction of the stator core 14 are formed on the radially inner and outer surfaces of each coil 15 arranged in the slot 31. The grooves 50 are formed to be substantially concave in an arc shape toward the central area in the width direction of the coil 15. When a plurality of coils 15 are arranged in the slot 31, the grooves 50 are formed on the opposing surfaces of the radially adjacent coils 15. Therefore, between the adjacently arranged coils 15, a flow path extending in the axial direction is ensured by the grooves 50 on each opposing surface.

[0057] Here, if Figure 1 , Figure 2 As shown, the first side housing 19 at one axial end side of the stator core 14 is provided with 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 housing 19 located at the axial outer end of the first liquid chamber 21 toward the end surface of one axial direction of the rotor 11. In the case of this embodiment, the first inner peripheral wall 32 is composed of a peripheral wall main body 12a formed integrally with the rotating electrical machine housing 12 (end side wall 33) and a separate cylindrical member 34 mounted on the outer peripheral surface of the extended end side of the peripheral wall main body 12a. The peripheral wall main body 12a and the cylindrical member 34 are sealed by an annular sealing member 60.

[0058] However, the first inner peripheral wall 32 may be formed integrally with the rotating electrical machine case 12 (the end side wall 33 ) as a whole.

[0059] In addition, the second side housing 20 at 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 the radially inner end of the end side wall 36 of the second side housing 20 located at the axially outer end of the second liquid chamber 22 toward the other axial end surface of the rotor 11. In the case of the present embodiment, the second inner peripheral wall 35 is formed integrally with the rotating electrical machine housing 12 (end side wall 36).

[0060] However, the second inner peripheral wall 35 may be constituted by a peripheral wall main body portion that is integrated with the rotating electrical machine case 12 (end side wall 36 ) and a separate cylindrical member, similarly to the first inner peripheral wall 32 .

[0061] A cylindrical annular partition wall 37 is provided on the outer peripheral surface of the first inner peripheral wall 32 of the first side housing 19 and the outer peripheral surface of the second inner peripheral wall 35 of the second side housing 20. The annular partition wall 37 is formed of, for example, a resin material. However, the annular partition wall 37 may also be formed of other raw materials such as a metal material. The annular partition wall 37 includes: a first end 37f facing the inside of the first liquid chamber 21; a second end 37s facing the inside of the second liquid chamber 22; and a partition wall main body 37b located between the first end 37f and the second end 37s and facing the inner peripheral surface of the stator core 14. The first end 37f is formed to have the same inner diameter as the partition wall main body 37b. The middle portion of the second end 37s in the extension direction is reduced in diameter in a stepped manner relative to the partition wall main body 37b.

[0062] The inner circumferential surface of the first end portion 37f is slidably fitted to the outer circumferential surface of the cylindrical member 34 of the first inner peripheral wall 32. An annular groove 38f is formed on the outer circumferential surface of the cylindrical member 34, and an annular sealing member 39f such as an O-ring is mounted on the annular groove 38f. The cylindrical member 34 (first inner peripheral wall 32) and the first end portion 37f (annular partition wall 37) are sealed liquid-tightly by the sealing member 39f.

[0063] In the present embodiment, the first end portion 37 f constitutes a guide member inside the first liquid chamber 21 that guides the coolant in the first liquid chamber 21 toward the opening of the slot 31 at one axial end side of the stator core 14 .

[0064] 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 sealing member 39s such as an O-ring is mounted on the annular groove 38s. The second inner peripheral wall 35 and the second end portion 37s (annular partition wall 37) are sealed liquid-tightly by the sealing member 39s.

[0065] As described above, the first end 37f of the annular partition wall 37 is liquid-tightly fitted to the first inner peripheral wall 32 of the first side case 19, and the second end 37s is liquid-tightly fitted to the second inner peripheral wall 35 of the second side case 20. The annular partition wall 37 separates the radially inner region of the stator core 14 mounted inside the rotating electrical 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 to the radially inner region, the coolant 23 can be prevented from flowing into the outer peripheral surface side of the rotor 11.

[0066] In addition, if Figure 2As shown, a bulging portion 40 is formed on the outer peripheral surface of the first end portion 37f of the annular partition wall 37, which bulges radially outward from the outer peripheral surface of the partition wall main body portion 37b. The end of the bulging portion 40 on the stator core 14 side rises radially outward in a stepped manner relative to the outer peripheral surface of the partition wall main body portion 37b. The raised end surface becomes an abutment seat 41 that abuts against the end surface of one axial end side of the stator core 14. The annular partition wall 37 is pressed toward the other axial end side as a whole 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 abutment seat 41 is pressed against the end surface of one axial side of the stator core 14. As a result, the annular partition wall 37 is stuck to the stator core 14 in an abutting state with the stator core 14.

[0067] Here, the abutment seat 41 (bulge 40) of the first end portion 37f blocks a portion of the radially inner region of the slot 31 that opens to one end face in the axial direction of the stator core 14 from the first liquid chamber 21 side. The abutment seat 41 (bulge 40) is formed in a manner that covers a predetermined height range of the radially outer side from the radially inner end of the slot 31 on the first liquid chamber 21 side. Specifically, as Figure 3 As shown, the abutment seat 41 (bulged portion 40 ) is formed so that the radially outer end portion thereof has a protruding height substantially in contact with the radially inner end of the coil 15 located innermost in the slot 31 when viewed in the axial direction.

[0068] In the present embodiment, the bulging portion 40 constitutes a shielding portion (outflow restricting portion) that restricts outflow of the cooling liquid 23 from the first liquid chamber 21 to the radially inner region of the slot 31 .

[0069] like Figure 2 As shown, in the slot 31 portion at one axial end side of the stator core 14, the flow path opening area S1 between the coil 15 located most radially inward in the slot 31 and the bulge 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 most radially inward and the bulge 40 (outflow restriction portion), a flow path opening area S1 of substantially the amount of the groove 50 on one side of the coil 15 is ensured. Between adjacent coils 15, a flow path opening area S2 of substantially the amount of the opening areas of the two grooves 50 on the opposing surfaces is ensured.

[0070] In addition, as described above, the annular partition wall 37 provided between the first side housing 19 and the second side housing 20 is formed. Figure 3As shown, the inner peripheral surface of the partition body 37b of the annular partition wall 37 is in contact with or sufficiently close to the inner peripheral surface of the stator core 14. The inner peripheral surface of the partition body 37b of the annular partition wall 37 is opposed to the outer peripheral surface of the rotor 11 with a small gap therebetween.

[0071] When the rotating electric machine 1 having the above structure continuously flows current through the coil 15 during operation, the coil 15 generates heat and reaches a high temperature.

[0072] At this time, the coolant 23 is introduced from the circulation loop 25 to the first liquid chamber 21 of the rotating electrical machine 1 through the introduction port 24. The coolant 23 introduced into the first liquid chamber 21 flows in the first liquid chamber 21, thereby cooling the one end side area of ​​the coil 15 exposed to the outside from one axial end side of the stator core 14. In addition, the coolant 23 flows from one axial end side to the other end side in 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 passing through the slot 31. In addition, the coolant 23 flowing into the second liquid chamber 22 cools the other end side area of ​​the coil 15 exposed to the outside from the other axial end side of the stator core 14, and then returns to the circulation loop 25 through the discharge port 26.

[0073] As described above, the stator 10 of the rotating electrical machine 1 is always immersed in the coolant 23 in the rotating electrical machine case 12. In this state, the coolant 23 in the rotating electrical machine case 12 is replaced by the circulation circuit 25. Therefore, the coil 15 of the stator 10 is efficiently cooled by the coolant 23.

[0074] As described above, the rotary electric machine 1 of the present embodiment is provided with the first end 37f of the annular partition wall 37 on the axial end side (the side facing the first liquid chamber 21) of the stator core 14, and the bulge 40 (outflow restriction portion) of the first end 37f restricts the coolant 23 from flowing out of the first liquid chamber 21 to the radially inner region. Furthermore, 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 located most radially inward in the slot 31 and the bulge 40 (outflow restriction portion) is set to be smaller than the flow path opening area S2 between the 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 side through the gap between the coils 15.

[0075] Therefore, when the rotating electrical machine 1 of this embodiment is used, the excessive outflow of the coolant 23 from the slots 31 of the stator core 14 toward the outer circumference of the rotor 11 can be suppressed with a simple structure. Therefore, the rotating electrical machine 1 of this embodiment can contribute to energy efficiency.

[0076] In addition, the rotary electric machine 1 of the present embodiment is provided with a first inner peripheral wall 32 and a second inner peripheral wall 35 in the first liquid chamber 21 and the second liquid chamber 22, respectively, and an annular partition wall 37 is provided on the outer peripheral surface of the first inner peripheral wall 32 and the outer peripheral surface of the second inner peripheral wall 35 to separate the inner peripheral surface of the stator core 14 from the outer peripheral surface of the rotor 11. Therefore, even if the coolant 23 flowing in 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 structure is adopted, it is possible to prevent the rotation of the rotor 11 from being hindered by the coolant 23.

[0077] It should be noted that when the coolant flowing in the plurality of slots 31 flows out excessively to the radially inner region of the slots 31, there is a concern that the annular partition wall 37 may be deformed by being pressed radially inward by the coolant 23. However, in the rotary electric machine 1 of the present embodiment, since a bulge 40 (outflow restriction portion) is provided on one axial end side of the annular partition wall 37, the bulge 40 suppresses the excessive outflow of the coolant 23 to the radially inner region of the slots 31. Therefore, when the rotary 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 coolant 23. As a result, the stable rotation performance of the rotary electric machine 1 can be maintained for a long time.

[0078] In the rotary electric machine 1 of the present embodiment, the first end portion 37f of the annular partition wall 37 functions as a guide member for guiding the coolant 23 to the slot 31 portion on one axial end side of the stator core 14. In addition, the bulge portion 40 provided on the first end portion 37f functions as a shielding portion (outflow restriction portion) that abuts or approaches an end face on one axial side of the stator core 14 to suppress the coolant 23 from flowing to the radially inner region of the slot 31 portion on one axial end side of the stator core 14. Therefore, when the rotary electric machine 1 of the present embodiment is adopted, the excessive outflow of the coolant from the slot 31 to the outer peripheral direction of the rotor 11 can be suppressed without changing the shape of the slot 31 portion of the stator core 14. As a result, the rotary electric machine 1 can be manufactured at low cost.

[0079] Moreover, in the rotating electric machine 1 of the present embodiment, the first end portion 37f (guide member) of the annular partition wall 37 is fixed to the stator core 14 in a state of abutting against 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 to generate friction caused by shaking or contact between the annular partition wall 37 and the stator core 14. It should be noted that the partition wall main body portion 37b of the annular partition wall 37 may also abut against the inner peripheral surface of the stator core 14.

[0080] Therefore, when the rotating electrical machine 1 of the present embodiment is used, the air gap between the stator core 14 and the rotor 11 can be sufficiently narrowed without causing noise or component degradation due to friction, thereby improving the magnetic performance of the rotating electrical machine 1 .

[0081] In the rotary electric machine 1 of the present embodiment, an abutment seat 41 is provided at the first end portion 37f of the annular partition wall 37, which abuts against one end surface of the stator core 14 in the axial direction. 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 is higher than the hydraulic pressure in the second liquid chamber 22. Therefore, the first end portion 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 coolant 23 in the second liquid chamber 22. In the rotary electric machine 1 of the present embodiment, the abutment seat 41 of the first end portion 37f abuts against the end surface of the stator core 14 in the axial direction, and thus the first end portion 37f is locked to the stator core 14.

[0082] Therefore, when the rotary electric 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 reliably locked to the stator core 14. In addition, in this case, other components such as a fastening member for locking the first end portion 37f to the stator core 14 are not required, so the assembly work during the manufacture of the rotary electric machine 1 is also facilitated.

[0083] In addition, in the rotary electric machine 1 of the present embodiment, a groove 50 extending along the axial direction of the stator core 14 is formed on the opposing surfaces (radial surfaces facing the stator core 14) of the coils 15 adjacently arranged in the slot 31. Therefore, the flow path opening area S2 between the coils 15 adjacently arranged in the slot 31 can be easily and reliably enlarged. Therefore, when this structure is adopted, the flow path opening area S1 between the coil 15 located at the radially innermost position in the slot 31 and the bulging portion 40 of the annular partition wall 37 can be easily and reliably reduced relative to the flow path opening area S2 between the adjacent coils 15.

[0084] <Second Embodiment>

[0085] Figure 4 The rotating electrical machine 101 of this embodiment is different from that of the first embodiment. Figure 2 The corresponding cross-sectional view.

[0086] Figure 5 The rotating electrical machine 101 of this embodiment is along Figure 4 A cross-sectional view of line VV.

[0087] In the rotary electric machine 101 of the present embodiment, the shape of the slot 31e of the steel plate 45e at one axial end side (the side facing the first liquid chamber 21) among the plurality of steel plates 45 constituting the stator core 114 is different from the shapes of the other slots 31. The structure of the other parts is substantially the same as that of the first embodiment described above.

[0088] The slots 31e of the steel plate 45e at one axial end side are formed by closed slots that are closed radially inwardly of the stator core 114. That is, the radially inner ends of the coil insertion portions of the slots 31e extending in the radial direction are closed by the slot closing portions 46. Therefore, on the inner circumferential surface of the steel plate 45e at one axial end side, the ends of the slots 31e are not opened. The inner circumferential surface of the steel plate 45e is in a continuous circumferential shape.

[0089] The partition body 37b of the annular partition 37 is fitted on the inner peripheral surface of the steel plate 45e. In this embodiment, the first end 37f of the annular partition 37 serving as a guide member is locked to the inner peripheral surface of the stator core 114 via the partition body 37b.

[0090] The slot closing portion 46 of the steel plate 45 e at one axial end side constitutes an outflow restriction portion that restricts outflow of the coolant from the first liquid chamber 21 to the radially inner region of the slot 31 at one axial end portion of the stator core 114 .

[0091] The slots 31 of the steel plates 45 other than the steel plate 45 e on one axial end side are formed as open slots that open radially inward.

[0092] In addition, in this embodiment, only one steel plate 45e on one end side in the axial direction is used as a closed slot, but a plurality of steel plates 45 on one end side in the axial direction may be used as a closed slot.

[0093] In the slot 31e portion of the steel plate 45e at 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 blocking portion 46 (outflow restriction portion) is set smaller than the flow path opening area S2 between adjacent coils 15 in the slot 31e. Specifically, in the case of the present embodiment, between the coil 15 located most radially inward and the slot blocking portion 46 (outflow restriction portion), a flow path opening area S1 of substantially the amount of the groove 50 on one side of the coil 15 is ensured. Between adjacent coils 15, a flow path opening area S2 of substantially the amount of the opening areas of the two grooves 50 on the opposing surfaces is ensured.

[0094] As described above, in the rotating electric machine 101 of the present 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 most radially inward 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 the adjacent coils 15 in the slot 31. Therefore, the flow rate of the coolant 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 flowing from the first liquid chamber 21 to the second liquid chamber side through the gap between the coils 15.

[0095] Therefore, when the rotary electric machine 101 of the present embodiment is adopted, it is possible to suppress the excessive outflow of the coolant from the slots 31 of the stator core 114 toward the outer peripheral direction of the rotor 11 with a simple structure.

[0096] The rotating electrical machine 101 of the present embodiment has substantially the same structure as that of the first embodiment except for the shape of the slot 31 e of the steel plate 45 e at one axial end, and thus can obtain the same effects as those of the first embodiment.

[0097] <Third Embodiment>

[0098] Figure 6 The rotating electrical machine 201 of this embodiment is different from the first embodiment. Figure 2 The corresponding cross-sectional view.

[0099] In the rotating electric machine 201 of the present embodiment, the slots 31 of the stator core 14 are open slots that are opened radially inward for all the steel plates, as in the first embodiment. The rotating electric machine 201 of the present embodiment does not have the annular partition wall 37 as in the first and second embodiments. The rotating electric machine 201 has an annular guide member 55 engaged with the 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.

[0100] The guide member 55 includes: a cylindrical wall 55a fitted with the outer peripheral surface of the first inner peripheral wall 32 (cylindrical member 34); and a flange wall 55b extending radially outward from the end of the cylindrical wall 55a on one side of the end surface facing the stator core 14. A plurality of coil insertion holes 56 penetrating in the plate thickness direction are formed on the flange wall 55b. The coil insertion holes 56 are holes that are substantially rectangular and extend in the radial direction. The coil insertion holes 56 are formed at positions corresponding to the plurality of slots 31 of the stator core 14. The ends of the plurality of coils 15 inserted into the slots 31 of the stator core 14 pass through the coil insertion holes 56 in a manner of being pulled out to the first liquid chamber 21 side. The flange wall 55b abuts against the end surface of one side of the axial direction of the stator core 14 (the end surface on the side facing the first liquid chamber 21).

[0101] The radially inner edge 57 of each coil insertion hole 56 of the flange wall 55b contacts the inner peripheral edge of the end surface 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.

[0102] In the present embodiment, the radially inner edge 57 of the coil insertion hole 56 in the flange wall 55b of the guide member 55 constitutes a shielding portion (outflow restriction portion). The radially inner edge 57 of the coil insertion hole 56 restricts the coolant from flowing out from the first liquid chamber 21 to the radially inner region of the slot 31. In addition, the guide member 55 functions in the first liquid chamber 21 to guide the coolant to the slot 31 on one axial end side of the stator core 14.

[0103] 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 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.

[0104] As described above, in the rotating electric machine 201 of the present embodiment, in the slot 31 portion at 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 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 to 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 to the second liquid chamber side through the gap between the coils 15.

[0105] Therefore, when the rotary electric machine 201 of the present embodiment is employed, it is possible to suppress the excessive outflow of the coolant from the slots 31 of the stator core 14 toward the outer circumference of the rotor 11 with a simple structure.

[0106] In addition, in the case of the present embodiment, 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, so there is a situation where a part of the coolant flowing out to the radial inner side of the slot 31 flows 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 to the radial inner area of ​​the slot 31 is throttled by the edge 57 of the guide member 55 (the flow path opening area S1<the flow path opening area S2), it is possible to prevent the coolant from flowing out too much in the direction of the outer peripheral surface of the rotor 11 and the rotation of the rotor 11 being hindered by the coolant.

[0107] <Fourth Embodiment>

[0108] Figure 7 is a longitudinal sectional view of the rotating electrical machine 301 of the present embodiment, Figure 8 Yes Figure 7 An enlarged cross-sectional view of part VIII. Fig. 9 It is along Figure 7 The cross-sectional view of line IX-IX, Fig.10 It is along Figure 7 The sectional view of line XX. In addition, Fig.11 It is along Figure 8 The cross-sectional view of the XI-XI line, Fig.12 It is along Figure 8 A cross-sectional view taken along line XII-XII.

[0109] The rotating electric machine 301 of this embodiment is similar to the first embodiment, in which the stator 10 and the rotor 11 are accommodated in the rotating electric machine housing 12, and the stator 10 is fixed in the rotating electric machine housing 12 by bolts 13. The rotor 11 is supported by the rotating shaft 17 via the sleeve 16 so as to be integrally rotatable. In addition, the rotating shaft 17 is supported by the rotating electric machine housing 12 via the bearing 18 so as to be rotatable. A supply passage 76 for the coolant 23 (lubricating liquid) is provided at the axial center portion of the rotating shaft 17. A supply hole 77 is formed near the support position of the bearing 18 of the rotating shaft 17, which penetrates in the radial direction and is used to supply the coolant 23 in the supply passage 76 to the bearing 18.

[0110] The stator 10 includes a cylindrical stator core 314 and a plurality of coils 15 wound around the stator core 314. Figure 8 As shown, the stator core 314 is formed by stacking a plurality of steel plates 45 (electromagnetic steel plates) in the axial direction. Fig. 9 , Fig.10 As shown, 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 circumference of the back yoke 27. Slots 31 are formed between circumferentially adjacent teeth 28. A plurality of coils 15 are wound around the teeth 28 via the slots 31.

[0111] The rotating electrical machine housing 12 includes a first side housing 19 and a second side housing 20. The first side housing 19 covers the end surface of one axial direction of the stator core 314 and the exposed portion of the coil 15 protruding from the end surface from the outside. The first side housing 19 forms an annular first liquid chamber 21 together with the end surface of one axial direction of the stator core 314.

[0112] The second side housing 20 covers the other axial end face of the stator core 314 and the exposed portion of the coil 15 protruding from the end face from the outside. The second side housing 20 forms an annular second liquid chamber 22 together with the other axial end face of the stator core 314. An inlet port 24 for introducing the coolant 23 into the first liquid chamber 21 is formed on the first side housing 19. A discharge port 26 for discharging the coolant 23 in the second liquid chamber 22 to the outside is formed on the second side housing 20. The inlet port 24 and the discharge port 26 are connected to the circulation circuit 25.

[0113] The coolant introduced from the circulation circuit 25 into the first liquid chamber 21 cools the coil 15 , flows into the second liquid chamber 22 through the slots 31 of the stator core 314 , and returns from the second liquid chamber 22 to the circulation circuit 25 via the discharge port 26 .

[0114] like Figure 8 , Fig. 9 As shown, in the steel plate 45e disposed at one end in the axial direction among the steel plates 45 constituting the stator core 314, the slot 31e (31) is constituted by a closed slot. That is, the radially inner end of the coil insertion portion extending in the radial direction of the slot 31e of the steel plate 45e at the end is closed by the slot closing portion 46. In addition, the remaining steel plates 45a, 45b, and 45c constituting the stator core 314 are constituted by open slots opened radially inward.

[0115] like Fig. 9 , Fig.10 As shown, the coil 15 inserted into the slot 31 of the stator core 314 is composed of a flat wire having a substantially rectangular cross section. When each coil 15 is inserted into the slot 31, a groove 50 extending along the axial direction of the stator core 314 is formed on the radial surface. In addition, a gap d is ensured between the slot 31 and the coil 15, and between adjacent coils 15, and the gap d allows the coolant 23 to flow from the first liquid chamber 21 to the second liquid chamber 22.

[0116] The slot closing portion 46 of the steel plate 45 e at one axial end side constitutes an outflow restriction portion at one axial end portion of the stator core 314 , which restricts outflow of the coolant 23 from the first liquid chamber 21 to the radially inner region of the slot 31 .

[0117] like Fig. 9 As shown, 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 blocking portion 46 (outflow restriction portion) is set smaller than the flow path opening area S2 between adjacent coils 15 in the slot 31e. Specifically, between the coil 15 located most radially inward and the slot blocking portion 46 (outflow restriction portion), a flow path opening area S1 of substantially the amount of the groove 50 on one side of the coil 15 is ensured. Between adjacent coils 15, a flow path opening area S2 of substantially the amount of the opening areas of the two grooves 50 on the opposing surfaces is ensured.

[0118] In addition, an annular guide member 355 is mounted on the inner peripheral surface of one axial end side 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 elastic material supported by the guide body 355a. An end 355b on one axial side of the guide body 355a is formed into a thin wall, and the end 355b is bonded and fixed to the inner peripheral surface of the axial end of the stator core 314 in a fitted state.

[0119] Specifically, the end portion 355b of the guide body 355a is fixed to the inner peripheral surface of the steel plate 45e at the end portion of the stator core 314. The annular seal 355c is joined to the other end portion of the guide body 355a in the wall thickness direction.

[0120] 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 constitutes an annular partition wall that partitions the radially inner region of the first liquid chamber 21.

[0121] In addition, if Figure 8 As shown, the inner circumference of the steel plate 45e at the axial end of the stator core 314 is formed to have a larger diameter than the inner circumferences of the other steel plates 45a, 45b, and 45c. More specifically, the inner circumference of the steel plate 45e is formed to have a larger diameter than the inner circumferences of the other steel plates 45a, 45b, and 45c by the thickness of the thin end 355b of the guide body 355a. Thus, a gap having the same width as the gap 80 between the inner circumferences of the other steel plates 45a, 45b, and 45c of the stator core 314 and the outer circumference of the rotor 11 is ensured between the inner circumference of the end 355b of the guide body 355a and the outer circumference of the rotor 11.

[0122] like Figure 8 , Fig.11As shown in FIG. 1 , a plurality of slits 81 extending from the inner circumferential surface toward the radially outer side (vertically downward) are formed on two steel plates 45a adjacent to the steel plate 45e at the end of the stator core 314. The plurality of slits 81 are formed only in a portion of the stator core 314 below the rotating shaft 17. The slits 81 are arranged at both sides of the plurality of slots 31 located below the rotating shaft 17 in the circumferential direction, and extend to a position (lower position) closer to the outer circumferential surface of the stator core 314 than the slots 31.

[0123] like Figure 8 , Fig.12 As shown, a notch groove 82 opening toward the outer peripheral surface of the stator core 314 is formed on the steel plate 45b adjacent to the steel plate 45a of the stator core 314 on the axial inner side. The notch groove 82 opens vertically downward below the rotating shaft 17. In addition, the notch groove 82 is connected to 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 flowing 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 flowing 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 housing 12 through the slits 81 and the notch groove 82.

[0124] It should be noted that if Figure 8 As shown, the coolant 23 that has lubricated the bearing 18 through the supply passage 76 and the supply hole 77 of the rotating shaft 17 is guided by the guide body 355 a of the guide member 55 and is discharged to the bottom of the rotating electrical machine case 12 through the gap 80 , the slit 81 and the cutout groove 82 .

[0125] As described above, in the rotating electric machine 301 of the present embodiment, in the slot 31e portion on the 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 restriction portion) is set to be smaller than the flow path opening area S2 between the 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 side through the gap between the coils 15.

[0126] Therefore, when the rotary electric machine 301 of the present embodiment is adopted, it is possible to suppress the excessive outflow of the coolant 23 from the slots 31 of the stator core 314 toward the outer peripheral direction of the rotor 11 .

[0127] In the case of the rotary electric machine 301 of the present embodiment, the slots 31 formed on the steel plates 45a, 45b, and 45c other than the steel plate 45e on one axial end side of the stator core 314 are open slots that are opened radially inward. Therefore, a portion of the coolant 23 that has flowed out radially inward from the slots 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 to the radially inner region of the slot 31 is throttled by the slot closing portion 46 of the steel plate 45e at the end (the flow path opening area S1 < the flow path opening area S2), the outflow amount of the coolant 23 toward the outer peripheral surface of the rotor 11 can be suppressed.

[0128] Furthermore, the rotating electric machine 301 of the present embodiment is provided with a slit 81 and a notch groove 82 as a coolant discharge portion on the steel plates 45a and 45b that are part of the open slots. Therefore, a part of the coolant that has passed through the closed slots on one axial end side of the stator core 314 is discharged to the outside through the slit 81 and the notch groove 82 provided on a part of the steel plates 45a and 45b. Therefore, when the rotating electric machine 301 of the present embodiment is adopted, it is possible to more reliably suppress the coolant 23 that has flowed into the open slots of the stator core 314 from excessively flowing out to the outer peripheral surface side of the rotor 11.

[0129] In particular, in the rotary electric machine 301 of the present embodiment, the slit 81 and the notch groove 82 are provided so as to extend vertically downward at a position below the rotating shaft 17 of the steel plates 45a and 45b as the open slots. Therefore, the excess coolant 23 can be reliably discharged to the outside of the stator core 314 by utilizing the gravity acting on the coolant 23. In addition, when this structure is adopted, the discharge flow rate of the coolant 23 discharged from the stator core 314 can be easily adjusted by changing the shape and size of the slit 81 and the notch groove 82.

[0130] In addition, the rotary electric machine 301 of the present embodiment adopts the following structure: 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 housing 19. In the case of this structure, the radial inner area of ​​the first liquid chamber 21 can be partitioned by the guide member 355 without providing the inner peripheral wall which is difficult to manufacture on the side of the first side housing 19. Therefore, when this structure is adopted, it is possible to facilitate the manufacture of the rotary electric machine housing 12.

[0131] It should be noted that the present invention is not limited to the above-mentioned embodiments, and various design changes can be made without departing from the scope of the main purpose. For example, in the above-mentioned fourth embodiment, the coolant discharge portion is formed by a plurality of slits 81 and cutout grooves 82, but the structure of the coolant discharge portion is not limited to the slits 81 and the cutout grooves 82. The coolant discharge portion can be any coolant discharge portion as long as it can discharge a portion of the coolant 23 from the open slot to the outside, for example, it can also be a structure of only slits or a structure of only cutout grooves.

Claims

1. A rotating electrical machine comprising: A stator having a cylindrical stator core having a plurality of teeth and a plurality of slots alternately provided on an inner circumference thereof, and a plurality of coils wound around the teeth through the slots; a rotor rotatably disposed radially inward of the stator; A first liquid chamber disposed facing an end surface of the stator core in one axial direction; as well as The second liquid chamber is provided facing the other end surface of the stator core in the axial direction. The coolant introduced into the first liquid chamber flows into the second liquid chamber through the plurality of slots. in, An outflow restriction portion is provided on at least one axial end of the stator core to restrict the coolant from flowing out of the first liquid chamber to the radially inner region of the slot. In the slot portion on one axial end side, a flow passage opening area between the coil located most radially inward in the slot and the outflow restricting portion is set smaller than a flow passage opening area between adjacent coils in the slot.

2. The rotating electrical machine according to claim 1, wherein: A guide member is provided inside the first liquid chamber to guide the coolant toward the slot at one end side in the axial direction of the stator core. The guide member has a shielding portion, the shielding portion abutting or approaching an end surface of one axial direction of the stator core to suppress the coolant from flowing to a radially inner region of the slot on the axial end side of the stator core. The shielding portion constitutes the outflow restricting portion.

3. The rotating electrical machine according to claim 2, wherein: The guide member is locked to the stator core in a state of being in contact with the stator core.

4. The rotating electrical machine according to claim 3, wherein: The guide member is provided with a contact seat that contacts the one axial end surface of the stator core.

5. The rotating electrical machine according to claim 2, wherein: The radial inner side of the first liquid chamber is partitioned by a first inner peripheral wall, The radial inner side of the second liquid chamber is partitioned by a second inner peripheral wall, An annular partition wall is provided between the outer peripheral surface of the first inner peripheral wall and the outer peripheral surface of the second inner peripheral wall to separate the inner peripheral surface of the stator core and the outer peripheral surface of the rotor. The shielding portion is formed at a portion of the annular partition wall.

6. The rotating electrical machine according to claim 1, wherein: The portion of the slot disposed on one axial end side of the stator core is composed of a closed slot closed radially inwardly of the stator core. The slot blocking portion that closes the radial inner side of the closed slot constitutes the outflow restricting portion.

7. The rotating electrical machine according to claim 6, wherein: The slot located axially inward of the portion serving as the closed slot is constituted by an open slot opening toward the inner circumference of the stator core. The stator core is provided with a coolant discharge portion communicating with a portion of the slot serving as the open slot.

8. The rotating electrical machine according to claim 1, wherein: A groove extending in the axial direction of the stator core is formed on opposing surfaces of the coils adjacently arranged in the slot.

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