Rotary electric machine

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 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 a coil wound around the stator core. The stator core is integrally formed with, for example, a cylindrical back yoke (yoke) and a plurality of teeth protruding radially inward from the back yoke. Slots are formed between a plurality of adjacent teeth in the circumferential direction so as to open radially inward. A plurality of conductor portions of the coil are inserted into each slot.

[0003] In this type of rotating electrical machine, the coil generates heat and becomes hot during use. Therefore, it is important to accurately detect the temperature of the coil during use and control the supply power of the rotating electrical machine or the output of the cooling unit according to the detected temperature. In order to detect the temperature of the coil during use, a rotating electrical machine provided with a temperature sensor such as a thermistor is known (see Patent Document 1).

[0004] Also, as a method for efficiently cooling the coil of a rotating electrical machine, a method of continuously flowing a coolant inside a rotating electrical machine case that houses the stator is known (for example, see Patent Document 2).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] In a rotating electrical machine in which a coolant continuously flows inside a rotating electrical machine case, when detecting the temperature of a coil in the rotating electrical machine case by a temperature sensor such as a thermistor, the temperature sensor and the temperature detection part of the coil are likely to be always in contact with the coolant. For this reason, the detection result by 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 coil in real time. At present, improvement in this regard is desired.

[0007] Therefore, the present invention aims 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 electrical machine according to the present invention adopts the following configuration. That is, the rotating electrical machine according to the present invention includes a stator (for example, stator 10 in the embodiment) having a stator core (for example, stator core 14 in the embodiment) and a coil (for example, coil 15 in the embodiment) wound around the stator core, a rotor (for example, rotor 11 in the embodiment) that rotates with respect to the stator, a rotating electrical machine case (for example, rotating electrical machine case 12 in the embodiment) that houses the stator and the rotor inside and is provided with a flow path (for example, first liquid chamber 21, slot 31, second liquid chamber 22 in the embodiment) for a coolant for stator cooling inside, and a temperature sensor (for example, temperature sensor 70 in the embodiment) that contacts the coil at a position facing the flow path and detects the temperature of the coil. A concave groove (for example, concave groove 50 in the embodiment) is provided on the outer surface of the coil, and the temperature sensor is covered on the outside by a holding member (for example, holding member 61 in the embodiment) while being in contact with the inner surface of the concave groove, and is attached to the coil via the holding member.

[0009] With the above configuration, the temperature sensor comes into contact with a wide area portion within the concave groove on the outer surface of the coil, and the outside thereof will be covered by the holding member. For this reason, 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 less likely to be greatly affected by the temperature of the coolant. Therefore, it becomes possible to quickly and accurately detect the temperature of the coil by the temperature sensor.

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

[0011] In this case, since the outer surface of the temperature sensor comes into contact with a wide area portion within the holding groove of the holding member, it becomes difficult for the outer surface of the temperature sensor to be contacted by the coolant. For this reason, the detection result of the temperature sensor is less likely to be affected by the temperature of the coolant.

[0012] Inside the rotating electric machine case, a first liquid chamber (for example, the first liquid chamber 21 in the embodiment) facing one end surface in the axial direction of the stator core and a second liquid chamber (for example, the second liquid chamber 22 in the embodiment) facing the other end portion in the axial direction of the stator core are provided, and a plurality of slots (for example, the slots 31 in the embodiment) through which the coil is inserted through the stator core in the axial direction are provided in the stator core, and the plurality of slots may be configured to circulate the coolant introduced into the first liquid chamber to the second cooling chamber side and to form the flow path together with the first liquid chamber and the second liquid chamber.

[0013] In this case, substantially the entire area of the stator core and the coil is submerged in the coolant, and the stator core and the coil 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 will be attached to the coil at a downstream position (a position facing the second liquid chamber) of the coolant flow path in the rotating electrical machine case, sandwiching the stator core. Therefore, when this configuration is adopted, it becomes possible to quickly and accurately detect the temperature of the most easily heated part of the coil by the temperature sensor.

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

[0017] In this case, it becomes possible to flow the coolant along the outer surface of the coil in the slot by using the concave groove on the outer surface of the coil. Therefore, when this configuration is adopted, the cooling efficiency of the coil can be increased.

Advantages of the Invention

[0018] In the rotating electrical machine according to the present invention, the temperature sensor contacts a wide area portion in the concave groove on the outer surface of the coil, and the outside is covered by a holding member. Therefore, when the rotating electrical machine according to the present invention is adopted, the temperature of the coil arranged facing the coolant flow path can be quickly and accurately detected.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0020] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of the rotating electrical machine 1 of the present embodiment. The rotating electrical 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 electrical machine case 12. The stator 10 is fixed inside the rotating electrical machine case 12 by fastening with bolts 13 or the like. The stator 10 includes a cylindrical stator core 14 and a plurality of coils 15 wound around the stator core 14. The rotor 11 is rotatably disposed radially inward of the stator core 14 (stator 10).

[0021] The rotor 11 has a permanent magnet (not shown) attached near its outer peripheral surface. Further, the rotor 11 is integrally rotatably supported by a rotating shaft 17 via a sleeve 16. The rotating shaft 17 serves as an output shaft when the rotating electrical machine 1 is used as a motor, and serves as a power input shaft when the rotating electrical machine 1 is used as a generator. The rotating shaft 17 and the sleeve 16 are rotatably supported by the rotating electrical machine case 12 via bearings 18. In the following description, the direction parallel to the rotation axis C of the rotor 11 is referred to as the axial direction, the rotation direction of the rotor 11 is referred to as the circumferential direction, and the radial direction of the rotor 11 orthogonal to the axial direction and the circumferential direction is referred to as the radial direction.

[0022] Annular first side case 19 and second side case 20 are disposed at one end side and the other end side in the axial direction of the stator core 14. The main portions of the first side case 19 and the second side case 20 are formed by the rotating electrical machine case 12.

[0023] The first side case 19 covers from the outside the one end face in the axial direction of the stator core 14 and the exposed portion of the coil 15 protruding from that end face. The first side case 19 forms an annular first liquid chamber 21 together with the one end face in the axial direction of the stator core 14. An introduction port 24 for introducing the coolant 23 into the first liquid chamber 21 is formed in the first side case 19. The introduction port 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 passes through the inside of the stator core 14 and flows into the other end side in the axial direction of the stator core 14.

[0024] The second side case 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 that end face. The second side case 20 forms an annular second liquid chamber 22 together with the other end face in the axial direction 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 in the second side case 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 is returned from the discharge port 26 to the circulation circuit 25.

[0025] A feed pump P is connected in the middle of the circulation circuit 25. A heat exchanger OC that cools the coolant 23 by heat exchange with the outside air is connected upstream of the feed pump P in the circulation circuit 25. The downstream side of the feed pump P is connected to the introduction port 24. Also, the upstream side of the heat exchanger OC in the circulation circuit 25 is connected to the discharge port 26.

[0026] Figure 2 is a cross-sectional view taken along line II-II of Figure 1 of the rotating electrical machine 1. The stator core 14 is formed, for example, by axially laminating a plurality of electromagnetic steel sheets. As shown in FIG. 2, 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.

[0027] The teeth 28 are arranged at intervals in the circumferential direction. The teeth 28 are formed in a T shape when viewed from the axial direction. That is, the teeth 28 are integrally formed with a tooth body 29 protruding radially inward from the inner peripheral portion of the back yoke 27 and a flange portion 30 protruding from the inner radial end of the tooth body 29 to both sides in the circumferential direction.

[0028] A slot 31 with an open inner diameter is formed between adjacent teeth 28 in the circumferential direction. The slot 31 is formed surrounded by the opposing side walls of 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 portion of the tooth body 29 and the side portion of the flange portion 30. The portion of the slot 31 formed by the side portions of the left and right tooth bodies 29 has a substantially constant width. Also, the width of the portion of the slot 31 formed by the side portions of the left and right flange portions 30 is narrower than the width of the portion formed by the side portions of the left and right tooth bodies 29. Note that the inner diameter opening 40 of each slot 31 is formed sandwiched between the tip portions of the flange portions 30 on the left and right (both sides in the circumferential direction) of the slot 31. Also, each slot 31 penetrates the stator core 14 in the axial direction.

[0029] The coils 15 are provided, for example, in three phases of U-phase, V-phase, and W-phase. The coils 15 are configured, for example, by connecting a plurality of segment coils to each other. The outer surface of the metal core wire 41 of the coil 15 is covered by an insulating coating 42. Also, the coils 15 are formed of flat wires. That is, the shape of the cross section orthogonal to the extending direction of the coil 15 is formed in a substantially rectangular shape.

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

[0031] As shown in FIG. 2, in each slot 31, a plurality of slot insertion portions 15a of the coil 15 are inserted in multiple stages. The plurality of slot insertion portions 15a inserted into the same slot 31 are arranged in a line along the radial direction. In the present 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 arbitrarily set.

[0032] The plurality of slot insertion portions 15a inserted and arranged in each slot 31 are bundled so as to be arranged in parallel in a line, and their surroundings are covered by a sheet of the foaming insulating member 43. The foaming insulating member 43 can be, for example, one in which a foaming adhesive is arranged (applied) on the surface of an electrically insulating base sheet (the surface facing outward in the state of covering the slot insertion portion 15a), and a non-foaming adhesive is arranged (applied) on the back surface of the base sheet. The foaming insulating member 43 is inserted and arranged in the corresponding slot 31 together with these slot insertion portions 15a in a state of covering the surroundings of the plurality of slot insertion portions 15a. The foaming insulating member 43 foams in the corresponding slot 31 by performing heat treatment or the like later. As a result, a part of the outer surface of the foaming insulating member 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 arranged in the slot 31 as described above, a gap for communicating the one axial end side and the other end side of the stator core 14 is secured inside the slot 31. This gap constitutes a coolant passage 44 for flowing the coolant introduced into the first liquid chamber 21 toward the second liquid chamber 22 side. Specifically, the gap constituting the coolant passage 44 is, for example, a gap between the inner surface of the foamed insulating member 43 and the slot insertion portion 15a, a gap between adjacent slot insertion portions 15a, or a 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 the heat of the slot insertion portion 15a of the coil 15.

[0034] On the surfaces of each slot insertion portion 15a arranged in the slot 31 that face radially inward and radially outward, concave grooves 50 extending along the axial direction of the stator core 14 are formed. The concave grooves 50 are formed to be recessed in a substantially arc shape toward the central region in the width direction of the slot insertion portion 15a. When a plurality of slot insertion portions 15a are arranged in the slot 31 together with the foamed insulating member 43, the concave grooves 50 form gaps (flow-through gaps) extending substantially along 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 foamed insulating 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 constitute the flow path of the coolant in the rotating electric machine case 12.

[0035] FIG. 3 is a perspective view showing an end portion of the stator 10 facing the second liquid chamber 22. As shown in FIG. 3, similar concave grooves 50 are formed in the winding portion 15b of the coil 15 drawn out from the slot 31 of the stator core 14 so as to be continuous with the concave grooves 50 of the slot insertion portion 15a described above. In the example shown in FIG. 3, arc-shaped concave grooves 50 are formed on the upper surface and the lower surface of the winding portion 15b along the extending direction of the winding portion 15b. In the case of this embodiment, similar concave grooves 50 are also formed in the winding 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 part of the routing section 15b on the side facing the second liquid chamber 22. The temperature sensor 70 is constituted by, for example, a thermistor or the like. The temperature sensor 70 contacts the coil 15 (routing section 15b) and detects the temperature of the contact portion. The temperature sensor 70 is connected to the control unit of the rotating electric machine 1 by wiring (not shown). The control unit receives the 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 the present embodiment, the temperature sensor 70 has an outer surface shape formed in a substantially cylindrical shape. The temperature sensor 70 is attached to the coil 15 by a holding member 61 in a state where its outer surface (outer peripheral surface) is pressed against the inner surface of a concave groove 50 on one side of the routing section 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, in a substantially U-shaped cross-sectional 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. When the temperature sensor 70 is placed in the concave groove 50 of the routing section 15b of the coil 15, the holding member 61 sandwiches the temperature sensor 70 and the routing section 15b between the pair of clamping walls 61a and 61b. The holding member 61 can fix the temperature sensor 70 to the routing section 15b by the elasticity of the clamping walls 61a and 61b by pushing the routing section 15b and the temperature sensor 70 between the clamping walls 61a and 61b while expanding the clamping walls 61a and 61b.

[0039] On one of the clamping walls 61a of the holding member 61, a concave holding groove 62 is formed which holds the outer surface of the temperature sensor 70 in contact with the outer surface of the temperature sensor 70. The holding groove 62 extends so as to be substantially parallel to the extending direction of the concave groove 50 of the turning portion 15b when the clamping walls 61a, 61b clamp the temperature sensor 70 and the turning portion 15b. Therefore, when the holding member 61 clamps the temperature sensor 70 and the turning portion 15b by the clamping walls 61a, 61b, the inner surface of the holding groove 62 abuts so as to cover the outer surface of the temperature sensor 70, and in that 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 turning portion 15b.

[0040] Also, as shown in FIG. 1, the first side case 19 on one end side in the axial direction of the stator core 14 includes a first inner peripheral wall 32 facing the first liquid chamber 21. The first inner peripheral wall 32 projects cylindrically from the radially inner end of the end side wall 33 of the first side case 19 located at the outer axial end of the first liquid chamber 21 toward one end face in the 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 portion 12a formed integrally with the rotating electric machine case 12 (end side wall 33) and a separate cylindrical member 34 attached to the outer peripheral surface on the extending end side of the peripheral wall main body portion 12a. The space between the peripheral wall main body portion 12a and the cylindrical member 34 is sealed by an annular seal member 60. However, the first inner peripheral wall 32 may be entirely formed integrally with the rotating electric machine case 12 (end side wall 33).

[0041] Further, the second side case 20 on the other end side in the axial direction of the stator core 14 includes a second inner peripheral wall 35 facing the second liquid chamber 22. The second inner peripheral wall 35 projects cylindrically from the radially inner end of the end side wall 36 of the second side case 20 located at the outer axial end of the second liquid chamber 22 toward the other end face in the axial direction of the rotor 11. In the case of this embodiment, the second inner peripheral wall 35 is formed integrally with the rotating electric machine case 12 (end side wall 36). However, the second inner peripheral wall 35 may be configured by a peripheral wall main body portion integral with the rotating electric machine case 12 (end side wall 36) and a separate cylindrical member, similar to the first inner peripheral wall 32.

[0042] An annular partition wall 37, which is a cylindrical cover member, is installed 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 of, for example, a resin material. However, the annular partition wall 37 can also be formed of other materials such as a metal material. The annular partition wall 37 has a first end portion 37f facing the inside of the first liquid chamber 21, a second end portion 37s facing the inside of the second liquid chamber 22, and a partition wall main body portion 37b between the first end portion 37f and the second end portion 37s and facing the inner peripheral surface of the stator core 14. The first end portion 37f is formed with the same inner diameter as the partition wall main body portion 37b. The second end portion 37s has a reduced diameter in a stepped shape with respect to the partition wall main body portion 37b at an intermediate portion in the extending direction.

[0043] The inner peripheral surface of the first end portion 37f is slidably fitted to the outer peripheral surface of the cylindrical member 34 of the first inner peripheral wall 32. An annular groove 38f is formed on the outer peripheral surface of the cylindrical member 34, and an annular seal member 39f such as an O-ring is attached to the annular groove 38f. The space between the cylindrical member 34 (first inner peripheral wall 32) and the first end portion 37f (annular partition wall 37) is hermetically sealed by the seal member 39f. In the present embodiment, the first end portion 37f constitutes a guide member that guides the coolant in the first liquid chamber 21 to the slot 31 on one end side in the axial direction of the stator core 14 inside the first liquid chamber 21.

[0044] The inner peripheral surface of the reduced diameter portion of the second end portion 37s is slidably fitted to the outer peripheral surface of the second inner peripheral wall 35. An annular groove 38s is formed on the outer peripheral surface of the second inner peripheral wall 35, and an annular seal member 39s such as an O-ring is attached to the annular groove 38s. The space between the second inner peripheral wall 35 and the second end portion 37s (annular partition wall 37) is hermetically sealed by the seal member 39s.

[0045] As described above, the first end portion 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 portion 37s is liquid-tightly fitted to the second inner peripheral wall 35 of the second side case 20. The annular partition wall 37 partitions the radially inner region of the stator core 14 attached 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 into the radially inner region, the coolant 23 can be prevented from flowing into the outer peripheral surface side of the rotor 11.

[0046] Also, on the outer peripheral surface of the first end portion 37f of the annular partition wall 37, it bulges radially outward from the outer peripheral surface of the partition wall main body portion 37b. The end portion on the stator core 14 side of this bulging portion stands radially outward in a stepped manner with respect to the outer peripheral surface of the partition wall main body portion 37b. This standing end surface is in contact with the end surface on one axial end side of the stator core 14.

[0047] As shown in FIG. 2, the outer peripheral surface of the partition wall main body portion 37b of the annular partition wall 37 is maintained in contact with the inner peripheral surface of the stator core 14. Also, the inner peripheral surface of the partition wall main body portion 37b of the annular partition wall 37 faces the outer peripheral surface of the rotor 11 with a minute gap therebetween so as not to be in contact.

[0048] Here, the foamed insulating member 43 accommodated and disposed in each slot 31 of the stator core 14 together with the plurality of slot insertion portions 15a of the coil 15 enters the opening 40 on the radially inner side of the slot 31 when the foamed adhesive on the outer surface side foams due to heating or the like. The foamed adhesive that has entered the opening 40 is adhered to the outer peripheral surface of the annular partition wall 37 disposed outside the opening 40. As a result, the peripheral wall main body portion 12a of the annular partition wall 37 is adhesively fixed to the foamed insulating member 43 inside the plurality of slots 31 through the opening 40 of the slot 31.

[0049] When a current continuously flows through the coil 15 during operation of the rotating electrical machine 1 having the above configuration, the coil 15 generates heat and becomes high in temperature. At this time, the coolant 23 is introduced into the first liquid chamber 21 of the rotating electrical machine 1 from the circulation circuit 25 through the introduction port 24. The coolant 23 introduced into the first liquid chamber 21 cools one end region (the routing portion 15b) of the coil 15 exposed to the outside from one axial end side of the stator core 14 by flowing in the first liquid chamber 21. Further, the coolant 23 flows from one axial end side to the other end side through a plurality of slots 31 (coolant passages 44 in the slots 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 in the slot 31. Further, the coolant 23 flowing 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 then is returned to the circulation circuit 25 through the discharge port 26.

[0050] As described above, in the rotating electrical machine 1, the stator 10 is always immersed in the coolant 23 in the rotating electrical machine case 12, and the coolant 23 in the rotating electrical machine case 12 is replaced through the circulation circuit 25 in that state. Therefore, the coil 15 of the stator 10 is efficiently cooled by the coolant 23.

[0051] As described above, in the rotating electrical machine 1 of the present embodiment, the concave 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 concave groove 50. And the temperature sensor 70 is covered on the outside by the holding member 61 in that state and is attached to the coil 15 via the holding member 61. For this reason, the temperature sensor 70 contacts a wide area portion in the concave 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 can quickly and accurately detect the temperature (temperature change) of the coil 15 without being greatly affected by the temperature of the surrounding coolant 23. Therefore, when the rotating electrical machine 1 of the present embodiment is adopted, the temperature of the coil 15 arranged facing the flow path of the coolant 23 can be quickly and accurately detected.

[0052] In addition, in the rotating electrical machine 1 of the present embodiment, a concave holding groove 62 that holds the outer surface of the temperature sensor 70 in a state of being 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 comes into contact with a wide area portion within the holding groove 62 of the holding member 61. Therefore, when this configuration is adopted, it becomes difficult for the outer surface of the temperature sensor 70 to come into 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.

[0053] In addition, in the rotating electrical machine 1 of the present embodiment, a first liquid chamber 21 and a second liquid chamber 22 are provided on one end side and the other end side in the axial direction of the stator core 14, and a configuration is adopted in which the coolant is caused to flow from the first liquid chamber 21 to the second liquid chamber 22 by using a plurality of slots 31 of the stator core 14. That is, in the rotating electrical machine 1 of the present embodiment, a plurality of slots 31 of the stator core 14 constitute a flow path for the coolant 23 together with the first liquid chamber 21 and the second liquid chamber 22. Therefore, when this configuration is adopted, substantially the entire areas of the stator core 14 and the coil 15 are immersed in the coolant 23, and it becomes possible to efficiently cool the stator core 14 and the coil 15 with the coolant 23.

[0054] Furthermore, in the rotating electrical machine 1 of the present embodiment, at a position facing the second liquid chamber 22, the temperature sensor 70 is attached to the coil 15 (the lead portion 15b) by the holding member 61. Therefore, the temperature sensor 70 detects the temperature of the coil 15 at a downstream position on the other side of the stator core 14 in the flow path of the coolant 23 within the rotating electrical machine case 12. Therefore, when this configuration is adopted, it becomes possible to quickly and accurately detect the temperature of the most easily overheated portion of the coil 15 by the temperature sensor 70.

[0055] In addition, in the rotating electrical machine 1 of the present embodiment, a concave groove 50 is also formed in the slot insertion portion 15a of the coil 15 along the extending direction of the coil 15, and the concave groove 50 in the slot insertion portion 15a forms a flow gap through which the coolant flows in the slot 31. Therefore, the coolant 23 can be flowed using the concave groove 50 on the outer surface of the slot insertion portion 15a, and thereby the coil 15 (slot insertion portion 15a) can be efficiently cooled by the coolant 23.

[0056] In the case of the present embodiment, the concave groove 50 formed on the outer surface of the slot insertion portion 15a of the coil 15 and the concave groove 50 formed on the outer surface of the lead portion 15b are continuously formed on the same surface of the substantially rectangular cross section of the coil 15. Therefore, the continuous concave groove 50 on the outer surfaces of the slot insertion portion 15a and the lead portion 15b can be easily formed by pressing or the like.

[0057] In addition, in the rotating electrical machine 1 of the present embodiment, the temperature sensor 70 and the coil 15 (lead portion 15b) are simultaneously sandwiched by the holding member 61 which is an integral resin component, and thereby the temperature sensor 70 is fixed to the coil 15. Therefore, the temperature sensor 70 can be stably attached at an arbitrary position of the lead portion 15b of the coil 15 by the holding member 61 having a simple structure that is easy to manufacture.

[0058] Note that the present invention is not limited to the above-described embodiment, and various design changes are possible without departing from the gist thereof. For example, in the above-described embodiment, the temperature sensor 70 is attached to the lead portion 15b on the side facing the second liquid chamber 22 of the coil 15, but the temperature sensor 70 may be attached to the lead portion 15b on the side facing the first liquid chamber 21 of the coil 15.

[0059] In the above-described embodiment, the holding member 61 is constituted by an integral resin component having a pair of sandwiching walls 61a and 61b, but the structure and material of the holding member 61 are not limited thereto. The holding member 61 may be, for example, a clip-shaped component composed of a plurality of components, and the material is not limited to resin and may be metal or others.

[0060] Furthermore, in the above-described embodiment, a structure is adopted in which substantially the entire stator core 14 and coil 15 are completely immersed in the coolant 23. However, the cooling portions of the stator core 14 and coil 15 do not necessarily have to be of this structure. For example, the cooling portions of the stator core 14 and coil 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] Also, 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 does not necessarily have to be provided.

Explanation of Reference Numerals

[0062] 1... Rotating electrical machine 10... Stator 11... Rotor 12... Rotating electrical 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... Concave 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 with respect to the stator, a rotating electrical machine case that houses the stator and the rotor therein 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 concave groove is provided on the outer surface of the coil. The temperature sensor is covered on the outside by a holding member while being in contact with the inner surface of the concave groove, and is attached to the coil via the holding member. A rotating electrical machine characterized by this.

2. The rotating electrical machine according to claim 1, wherein 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.

3. Inside the rotating electrical machine case, a first liquid chamber facing one end surface of the stator core in the axial direction and a second liquid chamber facing the other end of the stator core in the axial direction are provided. The stator core is provided with a plurality of slots through which the coil is inserted axially through the stator core. The plurality of slots allow the coolant introduced into the first liquid chamber to flow toward the second cooling chamber side, and together with the first liquid chamber and the second liquid chamber, constitute the flow path. The rotating electrical machine according to claim 1 or 2, characterized by this.

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

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

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