Rotating electric machine

Abstract

The invention provides a rotating electrical machine. A rotating electrical machine is provided with a stator (10), a rotor, a rotating electrical machine housing, 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 rotating electrical machine housing accommodates a stator (10) and a rotor therein, and is provided with a flow path for a cooling liquid for cooling the stator therein. The temperature sensor (70) is in contact with the coil (15) at a position facing the flow path of the cooling liquid and detects the temperature of the coil (15). The outer surface of the coil (15) is provided with a groove (50). The outer side of the temperature sensor (70) is covered by the holding member (61) in a state in which the temperature sensor (70) is in contact with the inner surface of the groove (50) of the coil (15), and the temperature sensor (70) is attached to the coil (15) through the holding member (61).

Description

Technical Field

[0001] The present invention relates to rotating electrical machines such as electric motors and generators. Background Art

[0002] Rotating electrical machines such as electric motors and generators include a stator and a rotor that rotates relative to the stator. The stator includes a stator core and coils wound around the stator core. The stator core is integrally formed with, for example, a cylindrical back yoke (magnetic yoke) and a plurality of teeth protruding radially inward from the back yoke. Slots are formed between the plurality of teeth adjacent in the circumferential direction so as to open radially inward. A plurality of wire portions of the coil are inserted into each slot.

[0003] When such a rotating electrical machine is in use, the coils generate heat and become hot. Therefore, it is important to accurately detect the temperature of the coils during use and control the supply power of the rotating electrical machine and the output of the cooling unit based on the detected temperature. There is known a rotating electrical machine provided with a temperature sensor such as a thermistor for detecting the temperature of the coils during use (see Japanese Unexamined Patent Application Publication No. 2009-165340).

[0004] In addition, as a method for efficiently cooling the coils of a rotating electrical machine, there is known a method of continuously flowing a coolant through the inside of a rotating electrical machine housing that houses the stator (for example, see International Publication No. 2021 / 032238). Summary of the Invention

[0005] In a rotating electrical machine in which a coolant continuously flows through the inside of the rotating electrical machine housing, when the temperature of the coils in the rotating electrical machine housing is detected by a temperature sensor such as a thermistor, it is likely that the temperature sensor and the temperature detection portion of the coils are always in contact with the coolant. Therefore, the detection result of the temperature sensor is greatly affected by the temperature of the coolant, and it is difficult to reflect the actual heat generation state of the coils in real time. At present, it is desired to improve this point.

[0006] A solution of the present invention provides a rotating electrical machine capable of quickly and accurately detecting the temperature of coils arranged facing a flow path of a coolant.

[0007] A rotating electrical machine according to one aspect of the present invention includes: a stator having a stator core and coils wound around the stator core; a rotor that rotates relative to the stator; a rotating electrical machine housing that houses the stator and the rotor inside, and has a flow path for a coolant for cooling the stator inside; and a temperature sensor that contacts the coils at a position facing the flow path to detect the temperature of the coils. A groove is provided on the outer surface of the coils, and the temperature sensor is covered on the outside by a holding member in a state of contacting the inner surface of the groove, and is mounted on the coils by the holding member.

[0008] With the above structure, the temperature sensor contacts a large-area portion within the groove on the outer surface of the coil, and the outer side is covered by the holding member. Therefore, even if the temperature sensor and the temperature detection portion of the coil are arranged facing the coolant flow path, the detection result of the temperature sensor is hardly affected significantly by the temperature of the coolant. Thus, the temperature of the coil can be detected quickly and accurately by the temperature sensor.

[0009] Alternatively, a concave holding groove that holds the outer surface of the temperature sensor in a state of contacting the outer surface of the temperature sensor may be formed in the holding member.

[0010] In this case, the outer surface of the temperature sensor contacts a large-area portion within the holding groove of the holding member, so it is even more difficult for the outer surface of the temperature sensor to contact the coolant. Therefore, the detection result of the temperature sensor is even less likely to be affected by the temperature of the coolant.

[0011] Alternatively, a first liquid chamber facing one end face in the axial direction of the stator core and a second liquid chamber facing the other end portion in the axial direction of the stator core may be provided inside the rotating electric machine housing. A plurality of slots that penetrate the stator core in the axial direction and through which the coil is inserted are provided in the stator core. The plurality of slots allow the coolant introduced into the first liquid chamber to flow toward the second liquid chamber side, and together with the first liquid chamber and the second liquid chamber, constitute the flow path.

[0012] In this case, substantially the entire area of the stator core and the coil is immersed in the coolant, and the stator core and the coil can be efficiently cooled by the coolant.

[0013] Alternatively, the temperature sensor may be mounted on the coil by the holding member at a position facing the second liquid chamber.

[0014] In this case, the temperature sensor is mounted on the coil at a position on the downstream side (the position facing the second liquid chamber) of the coolant flow path in the rotating electric machine housing, sandwiching the stator core.

[0015] Therefore, in the case of adopting this structure, the temperature of the portion of the coil that is most likely to become hot can be detected quickly and accurately by the temperature sensor.

[0016] Alternatively, the groove may also be continuously provided along the extending direction of the coil at the portion of the coil inserted into the slot, and the groove forms a flow gap for the coolant to flow inside the slot.

[0017] In this case, the coolant can be made to flow along the outer surface of the coil in the slot by using the groove on the outer surface of the coil. Therefore, in the case of adopting this structure, the cooling efficiency of the coil can be improved.

[0018] In the rotating electric machine according to the solution of the present invention, the temperature sensor contacts a large-area portion in the groove on the outer surface of the coil, and the outside is covered by a holding member. Therefore, in the case of a rotating electric machine adopting the solution of the present invention, the temperature of the coil facing the coolant flow path configuration can be detected quickly and accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a longitudinal sectional view of the rotating electric machine of the embodiment.

[0020] Figure 2 is along the Figure 1 sectional view taken along line II-II of.

[0021] Figure 3 is a perspective view showing a part of the stator of the embodiment.

[0022] Figure 4 is a sectional view of the holding member of the embodiment.

[0023] Figure 5 is a sectional view showing a state where the temperature sensor is mounted on the coil by the holding member of the embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Hereinafter, embodiments of the present invention will be described based on the drawings.

[0025] Figure 1 is a longitudinal sectional view of the rotating electric machine 1 of the present embodiment.

[0026] The rotating electric machine 1 of the present embodiment includes a stator 10 and a rotor 11. The stator 10 and the rotor 11 are housed inside a rotating electric machine housing 12. The stator 10 is fixed inside the rotating 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 disposed radially inside the stator core 14 (stator 10).

[0027] The rotor 11 has a permanent magnet (not shown) mounted near its outer peripheral surface. In addition, the rotor 11 is integrally rotatably supported by a rotating shaft 17 via a sleeve 16. When the rotating electric machine 1 is used as a motor, the rotating shaft 17 becomes an output shaft, and when the rotating electric machine 1 is used as a generator, the rotating shaft 17 becomes a power input shaft. The rotating shaft 17 and the sleeve 16 are rotatably supported by the rotating electric machine housing 12 via bearings 18.

[0028] In the following description, the direction parallel to the rotation axis C of the rotor 11 is referred to as the axial direction, the rotation direction of the rotor 11 is referred to as the circumferential direction, and the radial direction of the rotor 11 orthogonal to the axial direction and the circumferential direction is referred to as the radial direction.

[0029] Annular first side housings 19 and second side housings 20 are arranged on one end side and the other end side in the axial direction of the stator core 14. Main portions of the first side housings 19 and the second side housings 20 are formed by the rotating electric machine housing 12.

[0030] The first side housing 19 covers, from the outside, one end face in the axial direction of the stator core 14 and the exposed portion of the coil 15 protruding from the end face. The first side housing 19 and one end face in the axial direction of the stator core 14 together form an annular first liquid chamber 21. An inlet 24 for introducing the coolant 23 into the first liquid chamber 21 is formed in the first side housing 19. The inlet 24 is connected to the 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 end side in the axial direction of the stator core 14 through the inside of the stator core 14.

[0031] The second side housing 20 covers, from the outside, the other end face in the axial direction of the stator core 14 and the exposed portion of the coil 15 protruding from the end face. The second side housing 20 and the other end face in the axial direction of the stator core 14 together form 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 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. An outlet 26 for discharging the coolant 23 in the second liquid chamber 22 to the outside is formed in the second side housing 20. The outlet 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 from the outlet 26 to the circulation circuit 25.

[0032] A feed pump P is connected in the middle of the circulation circuit 25. A heat exchanger OC that cools the coolant 23 by heat exchange with external gas 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 24. In addition, the upstream side of the heat exchanger OC in the circulation circuit 25 is connected to the outlet 26.

[0033] Figure 2 is a sectional view taken along line II-II of the rotating electric machine 1 Figure 1 of.

[0034] The stator core 14 is formed, for example, by laminating a plurality of electromagnetic steel sheets in the axial direction. As Figure 2As 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 peripheral portion of the back yoke 27. The back yoke 27 is formed such that the center of the cylinder coincides with the rotation axis C.

[0035] The teeth 28 are arranged at intervals along the circumferential direction. The teeth 28 are formed in a T shape when viewed axially. That is, the teeth 28 are integrally formed with a tooth body 29 protruding radially inward from the inner peripheral portion of the back yoke 27 and flange portions 30 protruding from the radially inner ends of the tooth body 29 toward both sides in the circumferential direction.

[0036] A slot 31 that opens radially inward is formed between the teeth 28 adjacent in the circumferential direction. The slot 31 is formed by being surrounded by the opposing side walls of the adjacent teeth 28 and the inner peripheral wall of the back yoke 27. The side walls of each tooth 28 are formed by the side portions of the tooth body 29 and the side portions of the flange portions 30. The portion of the slot 31 formed by the side portions of the left and right tooth bodies 29 is substantially of a constant width. In addition, the width of the portion of the slot 31 formed by the side portions of the left and right flange portions 30 is narrower than the width of the portion formed by the side portions of the left and right tooth bodies 29.

[0037] It should be noted that the radially inner opening 40 of each slot 31 is formed by being sandwiched between the front end portions of the flange portions 30 on the left and right (both sides in the circumferential direction) of the slot 31. In addition, each slot 31 penetrates the stator core 14 along the axial direction.

[0038] The coils 15 are provided with, for example, three phases of U-phase, V-phase, and W-phase. The coils 15 are formed by connecting a plurality of sector coils to each other, for example. The outer surface of the metal core wire 41 of the coils 15 is covered with an insulating coating film 42. In addition, the coils 15 are formed of flat wires. That is, the shape of the cross section of the coils 15 orthogonal to the extending direction is substantially formed in a rectangular shape.

[0039] Each coil 15 is axially inserted through the slot 31 of the stator core 14 and wound around the corresponding tooth 28 in this state.

[0040] Hereinafter, the portion of the coil 15 inserted through the slot 31 will be referred to as the "slot insertion portion 15a", and the portion exposed to the outside of the slot 31 and led around toward another slot 31 will be referred to as the "lead-around portion 15b".

[0041] As Figure 2 shown, the slot insertion portions 15a of the coils 15 are inserted through the respective slots 31 in multiple stages. The multiple slot insertion portions 15a inserted through the same slot 31 are arranged in a row along the radial direction. In the present embodiment, for example, five slot insertion portions 15a are inserted through the same slot 31. However, the number of slot insertion portions 15a inserted through the same slot 31 is not limited thereto and can be arbitrarily set.

[0042] A plurality of slot insertion portions 15a disposed in respective slots 31 are covered by a sheet of a foaming insulating member 43 in a state where they are bundled side by side in a row. The foaming insulating member 43 can adopt, for example, a structure in which a foaming adhesive is disposed (coated) on the surface of an electrically insulating base sheet (the surface facing outward in a state where the slot insertion portions 15a are covered), and a non-foaming adhesive is disposed (coated) on the back surface of the base sheet. The foaming insulating member 43 is inserted and disposed in the corresponding slot 31 together with these slot insertion portions 15a in a state where the peripheries of the plurality of slot insertion portions 15a are covered. The foaming insulating member 43 is then subjected to heat treatment or the like, whereby it foams in the corresponding slot 31. As a result, a part of the outer surface of the foaming insulating member 43 adheres to the inner wall of the slot 31.

[0043] Even after the slot insertion portions 15a of the coil 15 and the foaming insulating member 43 are disposed in the slot 31 as described above, a gap for communicating the one end side and the other end side in the axial direction of the stator core 14 can be ensured inside the slot 31. This gap constitutes a coolant passage 44 for allowing the coolant introduced into the first liquid chamber 21 to flow toward the second liquid chamber 22 side. Specifically, the gap constituting the coolant passage 44 is a gap between the inner surface of the foaming insulating member 43 and the slot insertion portion 15a, a gap between adjacent slot insertion portions 15a, a gap between the outer surface of the foaming insulating member 43 and the inner wall of the slot 31, etc. The coolant 23 flowing in the coolant passage 44 in the slot 31 absorbs the heat of the slot insertion portion 15a of the coil 15.

[0044] Grooves 50 are formed on the radially inner-facing surface and the radially outer-facing surface of each slot insertion portion 15a disposed in the slot 31 and extend along the axial direction of the stator core 14.

[0045] The groove 50 is substantially recessed in an arc shape toward the central region in the width direction of the slot insertion portion 15a. When the plurality of slot insertion portions 15a and the foaming insulating member 43 are disposed in the slot 31 together, the groove 50 forms a gap (flow-through gap) that substantially extends in the axial direction between the opposing end faces of the radially adjacent slot insertion portions 15a and between the end face of the slot insertion portion 15a and the inner surface of the foaming insulating member 43.

[0046] It should be noted that in the present embodiment, the first liquid chamber 21, the plurality of slots 31 of the stator core 14, and the second liquid chamber 22 constitute a flow path for the coolant in the rotating electric machine housing 12.

[0047] Figure 3 It is a perspective view showing an end portion of the stator 10 facing the second liquid chamber 22 side.

[0048] AsFigure 3 As shown, a groove 50 similar to that of the slot insertion portion 15a is formed in the lead-out portion 15b of the coil 15 led out from the slot 31 of the stator core 14 in a manner continuous with the groove 50. In Figure 3 In the case of the example shown, arc-shaped grooves 50 are formed along the extending direction of the lead-out portion 15b on the upper and lower surfaces of the lead-out portion 15b. It should be noted that in the case of the present embodiment, similar grooves 50 are also formed in the lead-out portion 15b facing the first liquid chamber 21 side.

[0049] A temperature sensor 70 for detecting the temperature of the coil 15 is mounted on a part of the lead-out portion 15b facing the second liquid chamber 22 side. The temperature sensor 70 is constituted by, for example, a thermistor or the like. The temperature sensor 70 is in contact with the coil 15 (lead-out portion 15b) and detects the temperature of the contact portion. The temperature sensor 70 is connected to the control portion of the rotating electric machine 1 through a wiring (not shown). The control portion receives the input signal from the temperature sensor 70 and controls the power supply portion and the cooling portion (for example, the feed pump P of the circulation circuit 25).

[0050] In the present embodiment, the outer surface shape of the temperature sensor 70 is substantially formed in a cylindrical shape. The temperature sensor 70 is mounted on the coil 15 through a holding member 61 in a state where its outer surface (outer peripheral surface) is pressed against the inner surface of the groove 50 on one side of the lead-out portion 15b.

[0051] Figure 4 is a cross-sectional view of the holding member 61, Figure 5 is a cross-sectional view showing the state where the temperature sensor 70 is mounted on the coil 15 through the holding member 61.

[0052] The holding member 61 is formed, for example, in a substantially letter shape (substantially U shape) in which a pair of clamping walls 61a and 61b are connected by a connecting wall 61c. In the case of the present embodiment, the holding member 61 is integrally formed of a resin material. The holding member 61 clamps the temperature sensor 70 and the lead-out portion 15b by a pair of clamping walls 61a and 61b in a state where the temperature sensor 70 is placed in the groove 50 of the lead-out portion 15b of the coil 15. While expanding the clamping walls 61a and 61b, the holding member 61 presses the lead-out portion 15b and the temperature sensor 70 between the clamping walls 61a and 61b. Thus, the temperature sensor 70 can be fixed to the lead-out portion 15b by the elasticity of the clamping walls 61a and 61b.

[0053] A concave holding groove 62 for holding the outer surface of the temperature sensor 70 in contact with the outer surface thereof is formed in one clamping wall 61a of the holding member 61. When the temperature sensor 70 and the lead winding portion 15b are clamped by the clamping walls 61a and 61b, the holding groove 62 extends substantially parallel to the extending direction of the groove 50 of the lead winding portion 15b. Therefore, when the holding member 61 clamps the temperature sensor 70 and the lead winding portion 15b through the clamping walls 61a and 61b, the inner surface of the holding groove 62 abuts against the outer surface of the temperature sensor 70 in a manner of covering the outer surface, and in this state, the remaining portion of the outer surface of the temperature sensor 70 is pressed against the inner surface of the groove 50 of the lead winding portion 15b.

[0054] In addition, as Figure 1 shown, the first side housing 19 on one axial end side of the stator core 14 has a first inner peripheral wall 32 facing the first liquid chamber 21. The first inner peripheral wall 32 projects cylindrically from the end portion on the radially inner side of the end side wall 33 of the first side housing 19 located at the outer axial end of the first liquid chamber 21 toward one axial end face of the rotor 11. In the case of the present embodiment, the first inner peripheral wall 32 is composed of a peripheral wall main body portion 12a integrally formed with the rotating electric machine housing 12 (end side wall 33) and a separate cylindrical member 34 mounted on the outer peripheral surface on the extending end side of the peripheral wall main body portion 12a. The space between the peripheral wall main body portion 12a and the cylindrical member 34 is sealed by an annular sealing member 60.

[0055] However, the first inner peripheral wall 32 may be integrally formed with the rotating electric machine housing 12 (end side wall 33) as a whole.

[0056] In addition, the second side housing 20 on the other axial end side of the stator core 14 has a second inner peripheral wall 35 facing the second liquid chamber 22. The second inner peripheral wall 35 projects cylindrically from the end portion on the radially inner side of the end side wall 36 of the second side housing 20 located at the outer axial end of the second liquid chamber 22 toward the other axial end face of the rotor 11. In the case of the present embodiment, the second inner peripheral wall 35 is formed integrally with the rotating electric machine housing 12 (end side wall 36).

[0057] However, the second inner peripheral wall 35 may also be composed of a peripheral wall main body portion integral with the rotating electric machine housing 12 (end side wall 36) and a separate cylindrical member, similar to the first inner peripheral wall 32.

[0058] A cylindrical cover member, i.e., an annular partition wall 37, is provided between 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 has 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 part in the extending direction of the second end 37s is reduced in diameter stepwise with respect to the partition wall main body 37b.

[0059] 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 on the outer peripheral surface of the cylindrical member 34, and an annular sealing member 39f such as an O-ring is fitted in the annular groove 38f. The space between the cylindrical member 34 (the first inner peripheral wall 32) and the first end 37f (the annular partition wall 37) is hermetically sealed by the sealing member 39f.

[0060] In the present embodiment, the first end 37f constitutes a guiding member inside the first liquid chamber 21 for guiding the coolant in the first liquid chamber 21 to the slot 31 on one axial end side of the stator core 14.

[0061] The inner peripheral surface of the reduced-diameter portion of the second end 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 fitted in the annular groove 38s. The space between the second inner peripheral wall 35 and the second end 37s (the annular partition wall 37) is hermetically sealed by the sealing member 39s.

[0062] As described above, the annular partition wall 37 is hermetically fitted to the first inner peripheral wall 32 of the first side housing 19 at the first end 37f and hermetically fitted to the second inner peripheral wall 35 of the second side housing 20 at the second end 37s. The annular partition wall 37 separates the radially inner region of the stator core 14 installed inside the rotating electric machine housing 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.

[0063] In addition, the outer peripheral surface of the first end 37f of the annular partition wall 37 bulges more radially outward than the outer peripheral surface of the partition wall main body 37b. The end on the stator core 14 side of the bulging portion stands up stepwise radially outward with respect to the outer peripheral surface of the partition wall main body 37b. The standing end face abuts against the end face on one axial end side of the stator core 14.

[0064] As Figure 2 shown, the outer peripheral surface of the partition main body portion 37b of the annular partition 37 is maintained in a state of abutting against the inner peripheral surface of the stator core 14. In addition, the inner peripheral surface of the partition main body portion 37b of the annular partition 37 faces the outer peripheral surface of the rotor 11 with a minute gap therebetween so as not to contact the outer peripheral surface of the rotor 11.

[0065] Here, the foamed insulating member 43 accommodated and disposed together with the plurality of slot insertion portions 15a of the coil 15 in each slot 31 of the stator core 14 enters the opening 40 on the radially inner side of the slot 31 due to the foaming of the foamed adhesive on the outer surface side by heating or the like. The foamed adhesive that has entered the opening 40 adheres to the outer peripheral surface of the annular partition 37 disposed outside the opening 40. As a result, the peripheral wall main body portion 12a of the annular partition 37 is adhesively fixed to the foamed insulating member 43 inside the plurality of slots 31 through the opening 40 of the slot 31.

[0066] In the rotating electric machine 1 having the above structure, if current continuously flows through the coil 15 during operation, the coil 15 generates heat and becomes high temperature.

[0067] At this time, the coolant 23 is introduced into the first liquid chamber 21 of the rotating electric machine 1 from the circulation circuit 25 through the introduction port 24. The coolant 23 introduced into the first liquid chamber 21 flows in the first liquid chamber 21, whereby one end side region (lead-out portion 15b) of the coil 15 exposed to the outside from one axial end side of the stator core 14 is cooled. In addition, the coolant 23 flows from one axial end side toward the other end side in the plurality of slots 31 (coolant passage 44 in the slot 31) of the stator core 14 and flows into the second liquid chamber 22. The coolant flowing in the slot 31 cools the slot insertion portion 15a of the coil 15 inserted into the slot 31. In addition, the coolant 23 that has flowed into the second liquid chamber 22 cools the other end side region of the coil 15 exposed to the outside from the other axial end of the stator core 14, and then returns to the circulation circuit 25 through the discharge port 26.

[0068] As described above, in the rotating electric machine 1, the stator 10 is always immersed in the coolant 23 in the rotating electric machine housing 12, and the coolant 23 in the rotating electric machine housing 12 is replaced through the circulation circuit 25. Therefore, the coil 15 of the stator 10 is efficiently cooled by the coolant 23.

[0069] As described above, in the rotating electric machine 1 of the present embodiment, the 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 groove 50. Further, in this state, the temperature sensor 70 is covered on the outside by the holding member 61 and is attached to the coil 15 via the holding member 61. Therefore, the temperature sensor 70 is in contact with a large area portion in the groove 50 on the outer surface of the coil 15, and the outside is covered by the holding member 61. Thereby, the temperature detection portion of the temperature sensor 70 is not greatly affected by the temperature of the surrounding coolant 23, and the temperature (temperature change) of the coil 15 can be detected quickly and accurately.

[0070] Therefore, in the case where the rotating electric machine 1 of the present embodiment is adopted, the temperature of the coil 15 disposed facing the flow path of the coolant 23 can be detected quickly and accurately.

[0071] In addition, in the rotating electric machine 1 of the present embodiment, a concave holding groove 62 for holding the outer surface of the temperature sensor 70 in contact with the outer surface of the temperature sensor 70 is formed in one clamping wall 61a of the holding member 61. Therefore, the outer surface of the temperature sensor 70 is in contact with a large area portion in the holding groove 62 of the holding member 61.

[0072] Therefore, in the case where this structure is adopted, the outer surface of the temperature sensor 70 is hardly in direct contact with the coolant 23, and the detection result of the temperature sensor 70 is less likely to be affected by the temperature of the coolant 23.

[0073] In addition, the rotating electric machine 1 of the present embodiment is configured such that a first liquid chamber 21 and a second liquid chamber 22 are provided on one axial end side and the other axial end side of the stator core 14, and the coolant flows from the first liquid chamber 21 to the second liquid chamber 22 through the plurality of slots 31 of the stator core 14. That is, in the rotating electric machine 1 of the present embodiment, the plurality of slots 31 of the stator core 14 and the first liquid chamber 21 and the second liquid chamber 22 together constitute the flow path of the coolant 23.

[0074] Therefore, in the case where this structure is adopted, substantially the entire regions of the stator core 14 and the coil 15 are immersed in the coolant 23, and the stator core 14 and the coil 15 can be efficiently cooled by the coolant 23.

[0075] Further, in the rotating electric machine 1 of the present embodiment, at the position facing the second liquid chamber 22, the temperature sensor 70 is attached to the coil 15 (lead winding portion 15b) via the holding member 61. Therefore, the temperature sensor 70 detects the temperature of the coil 15 at the downstream side position sandwiching the stator core 14 in the flow path of the coolant 23 in the rotating electric machine housing 12.

[0076] Therefore, in the case of adopting this structure, the temperature sensor 70 can quickly and accurately detect the temperature of the part in the coil 15 that is most likely to become hot.

[0077] In addition, in the rotating electric machine 1 of the present embodiment, a groove 50 is also formed along the extending direction of the coil 15 in the slot insertion portion 15a of the coil 15. The groove 50 in the slot insertion portion 15a forms a flow gap for the coolant 23 to flow in the slot 31. Therefore, by making the coolant 23 flow through the groove 50 on the outer surface of the slot insertion portion 15a, the coil 15 (slot insertion portion 15a) can be efficiently cooled by the coolant 23.

[0078] In the case of the present embodiment, the groove 50 formed on the outer surface of the slot insertion portion 15a of the coil 15 and the groove 50 formed on the outer surface of the winding portion 15b are continuously formed on the same surface of the substantially rectangular cross-section of the coil 15. Therefore, the groove 50 continuous with the outer surfaces of the slot insertion portion 15a and the winding portion 15b can be easily formed by stamping or the like.

[0079] In addition, in the rotating electric machine 1 of the present embodiment, the temperature sensor 70 and the coil 15 (winding portion 15b) are simultaneously clamped by an integral resin member, i.e., the holding member 61, thereby fixing the temperature sensor 70 to the coil 15. Therefore, the temperature sensor 70 can be stably installed at an arbitrary position on the winding portion 15b of the coil 15 by the holding member 61 having a simple structure that is easy to manufacture.

[0080] It should be noted that the present invention is not limited to the above-described embodiment, and various design changes can be made without departing from its gist. For example, in the above-described embodiment, the temperature sensor 70 is installed on the winding portion 15b of the coil 15 facing the second liquid chamber 22 side, but the temperature sensor 70 can also be installed on the winding portion 15b of the coil 15 facing the first liquid chamber 21 side.

[0081] In addition, in the above-described embodiment, the holding member 61 is composed of an integral resin member having a pair of clamping walls 61a and 61b, but the structure and material of the holding member 61 are not limited thereto. The holding member 61 can also be, for example, a clip-shaped member composed of a plurality of components, and the material is not limited to resin and can also be metal or other materials.

[0082] Furthermore, in the above-described embodiment, a structure is adopted in which the stator core 14 and substantially the entire area of the coil 15 are completely immersed in the coolant 23, but the cooling portions of the stator core 14 and the coil 15 do not have to be this structure. For example, the cooling portions of the stator core 14 and the coil 15 can also be a structure that sprays the coolant 23 or a structure that drips the coolant 23 from above.

[0083] In addition, in the above-described embodiment, a holding groove 62 for holding the outer surface of the temperature sensor 70 is formed in the holding wall 61a of the holding member 61. However, for example, when the outer surface of the temperature sensor 70 has a flat shape, the holding groove 62 may not be required.

Claims

1. A rotating electrical machine comprising: 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 housing that accommodates the stator and the rotor and has a flow path for a coolant for cooling the stator provided therein; and a temperature sensor that contacts the coil at a position facing the flow path to detect the temperature of the coil, A groove is provided on the outer surface of the coil, The temperature sensor is covered on the outside by a holding member in a state of being in contact with the inner surface of the groove, and is attached to the coil through the holding member.

2. The rotating electrical machine according to claim 1, wherein: The holding member has a concave holding groove formed therein for holding the outer surface of the temperature sensor in a state of being in contact with the outer surface of the temperature sensor.

3. The rotating electrical machine according to claim 1 or 2, wherein: A first liquid chamber facing one axial end surface of the stator core and a second liquid chamber facing the other axial end surface of the stator core are provided inside the rotating electrical machine housing. The stator core is provided with a plurality of slots penetrating the stator core in the axial direction and through which the coils are inserted. The plurality of slots allow the coolant introduced into the first liquid chamber to flow toward the second liquid chamber, and form the flow path together with the first liquid chamber and the second liquid chamber.

4. The rotating electrical machine according to claim 3, wherein: The temperature sensor is mounted to the coil through the holding member at a position facing the second liquid chamber.

5. The rotating electrical machine according to claim 3, wherein: The groove is also continuously provided along the extension direction of the coil at the portion of the coil inserted into the slot. The groove forms a flow gap inside the slot for the coolant to flow.

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