Rotating electric machines

Abstract

To provide a rotary electric machine capable of detecting a temperature of a coil which is disposed facing a coolant passage quickly and accurately.SOLUTION: A rotary electric machine includes a stator 10, a rotor, a rotary electric machine case, and a temperature sensor 70. The stator 10 has a stator core 14 and a coil 15. The rotor rotates relative to the stator 10. The rotary electric machine case houses the stator 10 and the rotor therein and includes a passage of a coolant for cooling the stator located therein. The temperature sensor 70 contacts with the coil 15 to detect a temperature of the coil 15 at a position facing the coolant passage. A recessed groove 50 is provided on an outer surface of the coil 15. The temperature sensor 70 is covered at the outer side with a holding member 61 while contacting with an inner surface of the recessed groove 50 of the coil 15 and is attached to the coil 15 through the holding member 61.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a rotating electrical machine such as an electric motor or a generator. [Background technology]

[0002] A rotating electric machine such as an electric motor or a generator includes a stator and a rotor that rotates relative to the stator. The stator includes a stator core and a coil wound around the stator core. The stator core is formed integrally with, for example, a cylindrical back yoke (yoke) and a plurality of teeth that protrude radially inward from the back yoke. Slots are formed between each of the plurality of teeth that are adjacent in the circumferential direction, opening radially inward. A plurality of conductor portions of the coil are inserted into each slot.

[0003] In this type of rotating electric machine, the coil generates heat during use and reaches a high temperature. For this reason, it is important to accurately detect the coil temperature during use and control the power supply to the rotating electric machine and the output of the cooling unit according to the detected temperature. Rotating electric machines equipped with a temperature sensor such as a thermistor to detect the coil temperature during use are known (see Patent Document 1).

[0004] Furthermore, a known method for efficiently cooling the coils of a rotating electrical machine is to continuously flow a coolant inside a rotating electrical machine case that houses a stator (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-165340 [Patent Document 2] International Publication No. 2021 / 032238 Summary of the Invention [Problem to be solved by the invention]

[0006] In a rotating electrical machine in which a coolant flows continuously inside the rotating electrical machine case, when the temperature of the coil inside the rotating electrical machine case is detected using a temperature sensor such as a thermistor, the temperature sensor and the coil temperature detection part tend to be in constant contact with the coolant. As a result, the detection result by the temperature sensor is significantly affected by the coolant temperature, and it is difficult to reflect the actual heat generation state of the coil in real time. Currently, there is a need to improve this point.

[0007] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a rotating electrical machine capable of quickly and accurately detecting the temperature of a coil disposed facing a coolant flow path. [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 of the present invention comprises a stator (e.g., stator 10 in the embodiments) having a stator core (e.g., stator core 14 in the embodiments) and a coil (e.g., coil 15 in the embodiments) wound around the stator core, a rotor (e.g., rotor 11 in the embodiments) that rotates relative to the stator, a rotating electric machine case (e.g., rotating electric machine case 12 in the embodiments) that houses the stator and the rotor and has a flow path for a coolant for cooling the stator (e.g., first liquid chamber 21, slot 31, second liquid chamber 22 in the embodiments) provided therein, and a temperature sensor (e.g., temperature sensor 70 in the embodiments) that contacts the coil at a position facing the flow path to detect the temperature of the coil, wherein a groove (e.g., groove 50 in the embodiments) is provided on the outer surface of the coil, and the temperature sensor is covered on the outside by a retaining member (e.g., retaining member 61 in the embodiments) while contacting the inner surface of the groove, and is attached to the coil via the retaining member.

[0009] With the above configuration, the temperature sensor contacts a large area within the recessed groove on the outer surface of the coil, and the outside is covered by the retaining member. Therefore, even if the temperature sensor and the temperature detection part of the coil are positioned facing the coolant flow path, the temperature sensor's detection results are not significantly affected by the coolant temperature. This allows the temperature sensor to detect the coil temperature quickly and accurately.

[0010] The holding member may be formed with a concave holding groove (for example, holding groove 62 in the embodiment) that holds the outer surface of the temperature sensor while being in contact with the outer surface of the temperature sensor.

[0011] In this case, the outer surface of the temperature sensor comes into contact with a large area within the holding groove of the holding member, making it less likely to come into contact with the coolant, and therefore the detection result of the temperature sensor is less susceptible to the temperature of the coolant.

[0012] Inside the rotating electric machine case, there are provided a first liquid chamber (e.g., first liquid chamber 21 in the embodiment) facing one axial end face of the stator core, and a second liquid chamber (e.g., second liquid chamber 22 in the embodiment) facing the other axial end face of the stator core, and the stator core is provided with a plurality of slots (e.g., slot 31 in the embodiment) that penetrate the stator core in the axial direction and through which the coil is inserted, and the plurality of slots allow the cooling liquid introduced into the first liquid chamber to circulate to the second cooling chamber side, and may also form the flow path together with the first liquid chamber and the second liquid chamber.

[0013] In this case, almost the entire area of ​​the stator core and the coils is submerged in the coolant, and the stator core and the coils are efficiently cooled by the coolant.

[0014] The temperature sensor may be attached to the coil by the holding member at a position facing the second liquid chamber.

[0015] In this case, the temperature sensor is attached to the coil at a downstream position (facing the second liquid chamber) across the stator core in the coolant flow path inside the rotating electrical machine case. Therefore, when this configuration is adopted, the temperature sensor can quickly and accurately detect the temperature of the part of the coil that is most likely to become hot.

[0016] The groove may be provided continuously along the extension direction of the coil at the portion of the coil that is inserted into the slot, and the groove may form a circulation gap within the slot through which the coolant flows.

[0017] In this case, the grooves on the outer surface of the coil can be used to allow the coolant to flow along the outer surface of the coil within the slot, thereby improving the cooling efficiency of the coil. [Effects of the Invention]

[0018] In the rotating electric machine according to the present invention, the temperature sensor contacts a wide area within the recessed portion on the outer surface of the coil, and the outside is covered by a retaining member, so when the rotating electric machine according to the present invention is used, the temperature of the coil located facing the coolant flow path can be detected quickly and accurately. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a longitudinal sectional view of a rotating electric machine according to an embodiment; [Figure 2] 2 is a cross-sectional view of the rotating electric machine according to the embodiment taken along line II-II in FIG. 1. [Figure 3] FIG. 2 is a perspective view showing a part of a stator according to the embodiment. [Figure 4] FIG. [Figure 5] FIG. 10 is a cross-sectional view showing a state in which the temperature sensor is attached to the coil by the holding member of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 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).

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] FIG. 2 is a cross-sectional view of the rotating electric machine 1 taken along line II-II in FIG. Stator core 14 is formed, for example, by stacking multiple electromagnetic steel sheets in the axial direction. As shown in Fig. 2, stator core 14 is formed by integrally molding 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.

[0027] The teeth 28 are arranged at intervals 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 integrally formed with tooth bodies 29 that protrude radially inward from the inner peripheral part of the back yoke 27 and flanges 30 that protrude on both circumferential sides from the radially inner ends of the tooth bodies 29.

[0028] 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. The radially inner openings 40 of each slot 31 are formed between the tip ends of the flanges 30 on the left and right (circumferential sides) of the slot 31. Each slot 31 also penetrates the stator core 14 in the axial direction.

[0029] The coil 15 is provided for three phases, for example, U phase, V phase, and W phase. The coil 15 is formed, for example, by interconnecting a plurality of segment coils. The coil 15 has a metal core wire 41 whose outer surface is covered with an insulating coating 42. The coil 15 is also formed of a rectangular wire. That is, the cross section perpendicular to the extension direction of the coil 15 is formed into a substantially rectangular shape.

[0030] Each coil 15 is inserted into a slot 31 of the stator core 14 along the axial direction, and in this state is wound around the corresponding tooth 28 . Hereinafter, the portion of the coil 15 that is inserted into the slot 31 will be referred to as the "slot insertion portion 15a," and the portion that is exposed outside the slot 31 and routed toward other slots 31 will be referred to as the "routing portion 15b."

[0031] 2, the slot insertion portions 15a of the coil 15 are inserted in multiple stages into each slot 31. The multiple slot insertion portions 15a inserted into the same slot 31 are arranged in a row along the radial direction. In this embodiment, for example, five slot insertion portions 15a are inserted into the same slot 31. However, the number of slot insertion portions 15a inserted into the same slot 31 is not limited to this and can be set arbitrarily.

[0032] The multiple slot insertion portions 15a inserted into each slot 31 are bundled in a row in parallel and are covered with a sheet of foamable insulating material 43. The foamable insulating material 43 can be, for example, an electrically insulating base sheet with a foamable adhesive applied to its surface (the surface facing outward when covering the slot insertion portions 15a) and a non-foamable adhesive applied to its back surface. The foamable insulating material 43, covering the peripheries of the multiple slot insertion portions 15a, is inserted into the corresponding slots 31 together with the slot insertion portions 15a. The foamable insulating material 43 is then foamed in the corresponding slot 31 by subsequent heating or other treatment. As a result, part of the outer surface of the foamable insulating material 43 is adhered to the inner wall of the slot 31.

[0033] Even after the slot insertion portion 15a of the coil 15 and the foamed insulating member 43 are placed in the slot 31 as described above, a gap is maintained inside the slot 31 to connect one axial end side and the other axial end side of the stator core 14. This gap forms a coolant passage 44 for allowing the coolant introduced into the first liquid chamber 21 to flow to the second liquid chamber 22 side. Specifically, the gaps that form the coolant passage 44 include the gap between the inner surface of the foamed insulating member 43 and the slot insertion portion 15a, the gap between adjacent slot insertion portions 15a, and the gap between the outer surface of the foamed insulating member 43 and the inner wall of the slot 31. The coolant 23 flowing through the coolant passage 44 in the slot 31 absorbs heat from the slot insertion portion 15a of the coil 15.

[0034] A groove 50 extending along the axial direction of the stator core 14 is formed on the radially inward and radially outward surfaces of each slot insertion portion 15a arranged in the slot 31. The groove 50 is formed to be recessed in a substantially arc shape toward the central region in the width direction of the slot insertion portion 15a. When multiple slot insertion portions 15a are arranged in the slot 31 together with the foamed insulation member 43, the groove 50 forms a gap (flow gap) extending substantially along the axial direction between the mutually facing end faces of radially adjacent slot insertion portions 15a and between the end face of the slot insertion portion 15a and the inner surface of the foamed insulation member 43. In this embodiment, the first liquid chamber 21, the plurality of slots 31 of the stator core 14, and the second liquid chamber 22 form a flow path for the coolant inside the rotating electrical machine case 12.

[0035] FIG. 3 is a perspective view showing the end of the stator 10 facing the second liquid chamber 22. As shown in FIG. As shown in Fig. 3, a similar groove 50 is formed in the routing portion 15b of the coil 15 drawn out from the slot 31 of the stator core 14 so as to be continuous with the groove 50 of the slot insertion portion 15a. In the example shown in Fig. 3, arc-shaped grooves 50 are formed on the upper and lower surfaces of the routing portion 15b along the extension direction of the routing portion 15b. In this embodiment, a similar groove 50 is also formed in the routing portion 15b on the side facing the first liquid chamber 21.

[0036] A temperature sensor 70 for detecting the temperature of the coil 15 is attached to a portion of the wiring portion 15b facing the second liquid chamber 22. The temperature sensor 70 is configured, for example, by a thermistor. The temperature sensor 70 comes into contact with the coil 15 (wiring portion 15b) and detects the temperature of the contact point. The temperature sensor 70 is connected to a control unit of the rotating electric machine 1 by wiring (not shown). The control unit receives an input signal from the temperature sensor 70 and controls the power supply unit and the cooling unit (for example, the feed pump P of the circulation circuit 25).

[0037] In this embodiment, the temperature sensor 70 has an outer surface that is formed into a substantially cylindrical shape. The temperature sensor 70 is attached to the coil 15 by a holding member 61 with its outer surface (outer circumferential surface) pressed against the inner surface of the recessed groove 50 on one side of the wiring portion 15b.

[0038] FIG. 4 is a cross-sectional view of the holding member 61, and FIG. 5 is a cross-sectional view showing a state in which the temperature sensor 70 is attached to the coil 15 by the holding member 61. The holding member 61 is formed, for example, with a substantially U-shaped cross section in which a pair of sandwiching walls 61a, 61b are connected by a connecting wall 61c. In this embodiment, the holding member 61 is integrally formed from a resin material. With the temperature sensor 70 placed in the recessed groove 50 of the routing portion 15b of the coil 15, the holding member 61 sandwiches the temperature sensor 70 and the routing portion 15b between the pair of sandwiching walls 61a, 61b. By pushing the routing portion 15b and the temperature sensor 70 between the sandwiching walls 61a, 61b while spreading them apart, the holding member 61 can fix the temperature sensor 70 to the routing portion 15b by the elasticity of the sandwiching walls 61a, 61b.

[0039] One clamping wall 61a of the holding member 61 is formed with a concave embracing groove 62 that is in contact with the outer surface of the temperature sensor 70 and embraces the outer surface of the temperature sensor 70. The embracing groove 62 extends so as to be approximately parallel to the extension direction of the concave groove 50 of the routing portion 15b when the clamping walls 61a, 61b clamp the temperature sensor 70 and the routing portion 15b. Therefore, when the holding member 61 clamps the temperature sensor 70 and the routing portion 15b with the clamping walls 61a, 61b, the inner surface of the embracing groove 62 abuts so as to cover the outer surface of the temperature sensor 70, and in this state, the remaining portion of the outer surface of the temperature sensor 70 is pressed against the inner surface of the concave groove 50 of the routing portion 15b.

[0040] 1, 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 axial 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 circumferential 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).

[0041] 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.

[0042] An annular partition wall 37, which is a cylindrical cover member, is provided on 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 is formed to have 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.

[0043] 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 portion 37f constitutes a guide member inside the first fluid chamber 21 that guides the coolant in the first fluid chamber 21 to the slot 31 on one end side of the stator core 14 in the axial direction.

[0044] 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.

[0045] 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.

[0046] Additionally, the outer peripheral surface of the first end 37f of the annular partition wall 37 bulges radially outward beyond the outer peripheral surface of the partition wall main body 37b. The end of this bulging portion 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 37b. This raised end face abuts against one axial end face of the stator core 14.

[0047] 2, the outer peripheral surface of the partition wall main body 37b of the annular partition wall 37 is maintained in contact with the inner peripheral surface of the stator core 14. In addition, 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.

[0048] Here, the foamable insulating members 43 housed and arranged in each slot 31 of the stator core 14 together with the multiple slot insertion portions 15a of the coils 15 enter the openings 40 on the radially inner side of the slots 31 as the foamable adhesive on the outer surface thereof foams due to heating or the like. The foamable adhesive that has entered the openings 40 is adhered to the outer peripheral surface of the annular partition wall 37 arranged on the outside of the openings 40. As a result, the peripheral wall main body portions 12a of the annular partition wall 37 are adhesively fixed to the foamable insulating members 43 on the inner side of the multiple slots 31 through the openings 40 of the slots 31.

[0049] 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, the coolant 23 is introduced from the circulation circuit 25 through the inlet port 24 into the first liquid chamber 21 of the rotating electrical machine 1. The coolant 23 introduced into the first liquid chamber 21 flows within the first liquid chamber 21, thereby cooling a one-end region (the lead-out portion 15b) of the coil 15 exposed to the outside from one axial end side of the stator core 14. The coolant 23 also flows through the multiple slots 31 (the coolant passages 44 within the slots 31) of the stator core 14 from one axial end side to the other axial end side, and flows into the second liquid chamber 22. The coolant flowing within the slots 31 cools the slot insertion portion 15a of the coil 15 inserted within the slot 31. The coolant 23 that has flowed into the second liquid chamber 22 cools the other-end region of the coil 15 exposed to the outside from the other axial end side of the stator core 14, and is then returned to the circulation circuit 25 through the outlet port 26.

[0050] 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.

[0051] As described above, in the rotating electric machine 1 of this embodiment, the recessed groove 50 is provided on the outer surface of the coil 15, and the temperature sensor 70 is in contact with the inner surface of the recessed groove 50. The temperature sensor 70 is then covered on the outside by the holding member 61 and attached to the coil 15 via the holding member 61. Therefore, the temperature sensor 70 is in contact with a large area within the recessed groove 50 on the outer surface of the coil 15, and the outside is covered by the holding member 61. This allows the temperature detection portion of the temperature sensor 70 to quickly and accurately detect the temperature (temperature change) of the coil 15 without being significantly affected by the temperature of the surrounding coolant 23. Therefore, when the rotating electrical machine 1 of this embodiment is employed, the temperature of the coil 15 arranged facing the flow path of the coolant 23 can be detected quickly and accurately.

[0052] Furthermore, in the rotating electric machine 1 of this embodiment, a concave embracing groove 62 that holds the outer surface of the temperature sensor 70 while being in contact with the outer surface of the temperature sensor 70 is formed in one sandwiching wall 61a of the holding member 61. Therefore, the outer surface of the temperature sensor 70 comes into contact with a wide area within the embracing groove 62 of the holding member 61. Therefore, when this configuration is adopted, the outer surface of the temperature sensor 70 is less likely to come into direct contact with the coolant 23, and the detection result of the temperature sensor 70 is less susceptible to the influence of the temperature of the coolant 23.

[0053] Furthermore, the rotating electric machine 1 of this embodiment is configured such that a first liquid chamber 21 and a second liquid chamber 22 are provided at one and the other axial ends of the stator core 14, and the coolant flows from the first liquid chamber 21 to the second liquid chamber 22 by utilizing a plurality of slots 31 of the stator core 14. In other words, in the rotating electric machine 1 of this embodiment, the plurality of slots 31 of the stator core 14, together with the first liquid chamber 21 and the second liquid chamber 22, form a flow path for the coolant 23. Therefore, when this configuration is adopted, almost the entire area of ​​the stator core 14 and the coils 15 is submerged in the coolant 23, making it possible to efficiently cool the stator core 14 and the coils 15 with the coolant 23.

[0054] Furthermore, in the rotating electric machine 1 of this embodiment, the temperature sensor 70 is attached to the coil 15 (the leading portion 15b) by the holding member 61 at a position facing the second liquid chamber 22. Therefore, the temperature sensor 70 detects the temperature of the coil 15 at a downstream position across the stator core 14 in the flow path of the coolant 23 inside the rotating electric machine case 12. Therefore, when this configuration is adopted, the temperature sensor 70 can quickly and accurately detect the temperature of the portion of the coil 15 that is most likely to become hot.

[0055] Furthermore, in the rotating electric machine 1 of this embodiment, grooves 50 are also formed in the slot insertion portions 15a of the coils 15 along the extending direction of the coils 15, and the grooves 50 in the slot insertion portions 15a form circulation gaps through which the coolant flows within the slots 31. Therefore, the coolant 23 flows by utilizing the grooves 50 on the outer surface of the slot insertion portions 15a, and the coils 15 (slot insertion portions 15a) can be efficiently cooled by the coolant 23.

[0056] In this embodiment, the grooves 50 formed on the outer surface of the slot insertion portion 15a of the coil 15 and the grooves 50 formed on the outer surface of the wiring portion 15b are formed continuously on the same surface of the approximately rectangular cross section of the coil 15. Therefore, the grooves 50 that are continuous on the outer surfaces of the slot insertion portion 15a and the wiring portion 15b can be easily formed by press working or the like.

[0057] Furthermore, in the rotating electric machine 1 of this embodiment, the temperature sensor 70 and the coil 15 (the routing portion 15b) are simultaneously sandwiched by the holding member 61, which is an integrated resin part, thereby fixing the temperature sensor 70 to the coil 15. Therefore, the temperature sensor 70 can be stably attached to any position on the routing portion 15b of the coil 15 using the holding member 61, which has a simple structure and is easy to manufacture.

[0058] The present invention is not limited to the above embodiment, and various design modifications are possible without departing from the spirit of the present invention. For example, in the above embodiment, the temperature sensor 70 is attached to the wiring portion 15b of the coil 15 on the side facing the second liquid chamber 22, but the temperature sensor 70 may be attached to the wiring portion 15b of the coil 15 on the side facing the first liquid chamber 21.

[0059] In the above embodiment, the holding member 61 is configured as a single resin part having a pair of clamping walls 61a, 61b, but the structure and material of the holding member 61 are not limited to this. The holding member 61 may be, for example, a clip-shaped part configured from multiple parts, and the material is not limited to resin and may be metal or other materials.

[0060] Furthermore, in the above embodiment, a structure is adopted in which almost the entire area of ​​the stator core 14 and the coils 15 is completely submerged in the coolant 23, but the cooling portion of the stator core 14 and the coils 15 does not necessarily have to have this structure. For example, the cooling portion of the stator core 14 and the coils 15 may have a structure in which the coolant 23 is sprayed or a structure in which the coolant 23 is dripped from above.

[0061] Furthermore, in the above embodiment, a holding groove 62 that holds the outer surface of the temperature sensor 70 is formed in the clamping wall 61a of the holding member 61, but for example, if the outer surface of the temperature sensor 70 has a flat shape, the holding groove 62 may not necessarily be present. [Explanation of symbols]

[0062] 1...Rotating electric machine 10...Stator 11...Rotor 12...Rotating electric machine case 14... Stator core 15...Coil 21...First liquid chamber (coolant flow path) 22...Second liquid chamber (coolant flow path) 31...Slot (coolant flow path) 50...Groove 61...holding member 62...Holding groove 70...Temperature sensor

Claims

1. a stator having a stator core and a coil wound around the stator core; a rotor that rotates relative to the stator; a rotating electrical machine case that accommodates the stator and the rotor and has a flow path for a coolant for cooling the stator provided therein; a temperature sensor that contacts the coil at a position facing the flow path and detects the temperature of the coil, The coil has an outer surface provided with a recessed groove, the temperature sensor is covered with a holding member in contact with the inner surface of the groove, and is attached to the coil via the holding member; The rotating electric machine is characterized in that the holding member is formed with a concave holding groove that holds the outer surface of the temperature sensor while being in contact with the outer surface of the temperature sensor.

2. a first fluid chamber facing one end face of the stator core in the axial direction and a second fluid chamber facing the other end face of the stator core in the axial direction are provided inside the rotating electric machine case; The stator core is provided with a plurality of slots through which the coils are inserted, the slots passing through the stator core in the axial direction, The rotating electric machine according to claim 1, characterized in that the plurality of slots allow the coolant introduced into the first liquid chamber to flow to the second liquid chamber side, and together with the first liquid chamber and the second liquid chamber, form the flow path.

3. 3. The rotating electrical machine according to claim 2, wherein the temperature sensor is attached to the coil by the holding member at a position facing the second fluid chamber.

4. the recessed groove is provided continuously along the extension direction of the coil at a portion of the coil that is inserted into the slot, 3. The rotating electrical machine according to claim 2, wherein the recessed groove forms a gap through which the coolant flows inside the slot.

Images