Temperature sensor and rotating motor

Abstract

The purpose is to prevent the position of the temperature sensor from being displaced from the predetermined position of the coil due to external forces such as vibration. A temperature sensor (2) for detecting the temperature of a coil (11) provided in a stator (10) of a rotating electric machine (1) comprises: a sensor unit (20) including a heat-sensitive body (211), wires (213, 22) electrically connected to the heat-sensitive body (211), and a covering body (24) formed of an elastic material and covering a part of the wires and the heat-sensitive body (211); and a bracket (30) including a first holding portion (32) for holding the covering body (24). The bracket (30) has a predetermined rotation axis (A) and is configured so that the covering body (24) can be pushed toward the coil (11) by the rotation of the bracket (30) in a predetermined rotation direction (r1).

Description

Technical Field

[0001] The present invention relates to a temperature sensor and a rotating electric machine having the temperature sensor. Background Art

[0002] For example, in a rotating electrical machine such as an electric motor mounted on a vehicle, the temperature of the coil increases as current flows through the coil provided in the stator. In order to avoid excessive temperature rise of the coil and to operate the rotating electrical machine stably, a temperature sensor is used to detect the temperature of the coil, and the operation of the rotating electrical machine is controlled based on the detected temperature.

[0003] Patent document 1 proposes inserting a temperature sensor between coils wound around teeth adjacent to each other in the circumferential direction in the stator of a rotating electric machine mounted on a vehicle to detect the temperature of the coils. The temperature sensor of Patent document 1 is covered with an insulating resin layer and is held by a bracket made of an elastic material such as fluororubber. When the bracket is inserted into the gap between the coils while being elastically deformed, the temperature detection portion of the temperature sensor contacts the coils via the resin layer.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2010-252508 Summary of the invention

[0007] Problems to be solved by the invention

[0008] Even in an environment subject to vibrations such as a vehicle, it is desirable to prevent the temperature sensor from being displaced from a predetermined position of the coil.

[0009] An object of the present invention is to provide a temperature sensor capable of preventing a coil from being displaced from a predetermined position due to external forces such as vibration, and a rotating electric machine including the temperature sensor.

[0010] Means used to solve problems

[0011] The present invention is a temperature sensor for detecting the temperature of a coil provided in a stator of a rotating electric machine, comprising: a sensor unit including a heat-sensitive body, a wire electrically connected to the heat-sensitive body, and a covering body formed of an elastic material covering a part of the wire and the heat-sensitive body; and a bracket holding the covering body in a cantilevered state and having a rotation axis. The bracket has a predetermined rotation axis and is configured so that the covering body can be pressed toward the coil by rotating the bracket in a predetermined direction.

[0012] In addition, the present invention is a temperature sensor for detecting the temperature of a coil of a stator of a rotating electric machine, comprising: a sensor unit, including a heat-sensitive body, an electric wire electrically connected to the above-mentioned heat-sensitive body, and a covering body covering a part of the above-mentioned electric wire and the above-mentioned heat-sensitive body and formed of an elastic resin material; and a bracket, which holds the above-mentioned covering body in a cantilever state and has a rotation axis; the above-mentioned covering body has: a first part, which is relatively short from the above-mentioned rotation axis and is held by the above-mentioned bracket; and a second part, which is relatively long from the above-mentioned rotation axis and covers the above-mentioned heat-sensitive body; the above-mentioned second part is located outside an imaginary circle passing through the above-mentioned first part and centered on the above-mentioned rotation axis.

[0013] The rotating electric machine of the present invention includes: a stator including a core and a coil; a rotor rotating relative to the stator; and the temperature sensor for detecting the temperature of the coil.

[0014] Effects of the Invention

[0015] According to the temperature sensor of the present invention, the bracket holding the covering body can be fixed to the fixed object in a state where the covering body covering the heat-sensitive body is elastically deformed and pushed onto the coil. Therefore, according to the temperature sensor of the present invention, it is possible to prevent the sensor unit from being offset from the specified position of the coil due to external forces such as vibration and impact, so that the temperature of the coil can be detected stably and accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a perspective view showing a part of a rotating electrical machine according to an embodiment of the present invention.

[0017] Figure 2 is from Figure 1 The top view of the temperature sensor and the coil is shown above.

[0018] Figure 3 (a) means Figure 1 A perspective view of a bracket for mounting a sensor unit on a rotating electrical machine as shown. Figure 3 (b) is a top view of the sensor unit.

[0019] Figure 4 (a) is a plan view showing a first posture of the bracket before the bracket is fastened to the fixed object. Figure 4 (b) is a plan view showing the second posture of the bracket after being connected.

[0020] Figure 5 It is a schematic top view of a temperature sensor according to a first modified example.

[0021] Figure 6 (a) is a schematic cross-sectional view of a temperature sensor according to an embodiment. Figure 6 (b) is a schematic cross-sectional view of the temperature sensor according to the second modified example. Figure 6 (c) is a schematic cross-sectional view of a temperature sensor according to the third modified example. DETAILED DESCRIPTION

[0022] Below, while referring to the attached Figure 1 One embodiment of the present invention will be described.

[0023] 〔Overall structure〕

[0024] Figure 1 The temperature sensor 2 shown is mounted on a stator 10 of a rotating electrical machine 1 such as a motor or a generator, and detects the temperature of a coil 11 of the stator 10. The rotating electrical machine 1 is mounted on a vehicle such as an electric car. The rotating electrical machine 1 includes a stator 10, a rotor (not shown) that rotates relative to the stator 10, and the temperature sensor 2.

[0025] The stator 10 includes a core (not shown) (hereinafter referred to as a stator core) which is a laminate of a plurality of electromagnetic steel sheets, a substantially cylindrical housing 12 that houses the stator core, and a coil 11 wound on the stator core. The coil 11 is composed of a coil wire C wound in a predetermined pattern. The coil wire C protrudes from a surface 12A of the housing 12 in the axial direction D1 of the stator 10 to form a coil end 11E.

[0026] The coil 11 of this embodiment is a distributed winding coil, but is not limited thereto and may also be a concentrated winding coil.

[0027] Temperature sensor 2 Figure 1 and Figure 2 As shown, the coil 11 is pressed from the outer periphery toward the inner periphery of the stator 10 relative to the coil end 11E in a substantially radial direction D3 of the coil 11 .

[0028] exist Figure 1 and Figure 2 , the axial direction D1, the circumferential direction D2, and the radial direction D3 of the stator 10 are shown. D3 represents one radial direction representatively.

[0029] Furthermore, with the surface 12A of the case 12 as a reference, the side where the coil end 11E protrudes in the axial direction D1 is referred to as “upper”, and the opposite side is referred to as “lower”.

[0030] 〔Structure of temperature sensor〕

[0031] Main reference Figure 3 (a) and Figure 3(b) of the present invention will explain the structure of the temperature sensor 2. The temperature sensor 2 includes a sensor unit 20 for detecting temperature and a bracket 30. The bracket 30 holds the sensor unit 20 and is fixed to the housing 12 as a fixing object by a bolt 35 as a male threaded member. The bolt 35 is equivalent to a bolt that fixes the stator core to the housing 12. Between the head 35A of the bolt 35 and the fixing portion 31, as shown in FIG. Figure 4 (a) Figure 4 As shown in (b) of FIG. 1 , a gasket 36 is arranged as needed.

[0032] Bracket 30 Figure 4 As shown, the bracket 30 has a rotation axis (A). If the bracket 30 is rotated in a predetermined rotation direction r1 with the rotation axis (A) as the center, the temperature sensor 2 is pressed toward the coil end 11E. The rotation axis (A) of the bracket 30 corresponds to the fastening center A which is the axis of the bolt 35 fastening the bracket 30 of this embodiment to the housing 12. In addition, the rotation direction r1 shown in the figure is consistent with the clockwise direction.

[0033] In this embodiment, a line segment L ( Figure 2 ) The positional relationship between the coil 11 and the temperature sensor 2 is set in such a way that the straight line extended from the coil 11 passes through the center of the plane (not shown) of the coil end 11E or its vicinity.

[0034] (Sensor unit)

[0035] The sensor unit 20 is as follows Figure 3 (a) Figure 3 As shown in (b), it comprises a heat-sensitive element 21, a pair of leads 22 electrically connected to the heat-sensitive element 21, a covering body 24 covering the entire heat-sensitive element 21 and a portion of the leads 22, and a tube 25 covering a specified section of the pair of leads 22 exposed from the covering body 24.

[0036] The heat-sensitive element 21 includes a heat-sensitive body 211 , an insulating sealing body 212 covering the heat-sensitive body 211 , and a pair of covered wires 213 led out from the sealing body 212 .

[0037] The heat-sensitive body 211 is configured to be able to detect temperature using a thermistor or the like whose resistance changes with temperature.

[0038] The sheathed wire 213 is connected to an electrode (not shown) provided on the heat-sensitive body 211, and is, for example, a copper-plated iron-nickel alloy wire (Dumet wire). A pair of sheathed wires 213 are led out in the same direction from the sealing body 212. The sheathed wire 213 and the lead wire 22 connected to the sheathed wire 213 together constitute an "electrical wire".

[0039] Hereinafter, the direction in which the clad wire 213 is led out relative to the heat-sensitive body 211 is referred to as "rear", and the opposite direction is referred to as "front". Figure 1 to Figure 3 In the figure, the “front” is represented by the symbol F, and the “rear” is represented by the symbol R.

[0040] The pair of lead wires 22 are connected to the pair of clad wires 213, respectively, and are connected to a temperature detection circuit (not shown). The lead wires 22 are composed of a core wire 221 joined to the clad wires 213 and an insulating cover 222 covering the core wire 221. The pair of lead wires 22 are led out from the cover 24 to the rear and then folded back toward the front.

[0041] That is, the pair of lead wires 22 each includes a first section 22A extending rearward inside the cover 24, a second section 22B drawn out from the cover 24 and folded back, and a third section 22C extending forward. When the lead wires 22 are viewed from the axial direction D1 of the stator 10, the third section 22C extends forward from the second section 22B at the lower side of the first section 22A over a predetermined length in parallel with the first section 22A. By routing the lead wires 22 in this way and holding the lead wires 22 at an appropriate position by the bracket 30, the lead wires 22 can be routed toward the temperature detection circuit while avoiding interference between the lead wires 22 and the coil end 11E.

[0042] A tube 25 is provided on the outer periphery of the third section 22C. The tube 25 can bundle the pair of lead wires 22 and align their directions.

[0043] The cover 24 protects the thermal element 21 and the connection portion 214 between the thermal element 21 and the lead wire 22 from external forces. The front end 24F of the cover 24 corresponds to the front end of the sensor unit 20. The thermal element 21 is arranged near the front end 24F of the cover 24.

[0044] The cover 24 is configured to be pressed toward the coil end 11E by the rotation of the bracket 30 in the rotation direction r1.

[0045] The cover 24 of this embodiment is as follows Figure 2As shown, it has a first portion 24A which is relatively short from the rotation axis (A) (close to the center A) and a longer second portion 24B. In the first portion 24A, the covering body 24 is held in a cantilevered manner by the first holding portion 32 of the bracket 30. In addition, the second portion 24B covers the heat-sensitive body 211 as an example and is arranged on the free end side. The second portion 24B is located outside the imaginary circle VC which is centered on the rotation axis (A) and passes through the first portion 24A, in other words, the first holding portion 32. The imaginary circle VC is separated from the coil 11. In addition, the second portion 24B is located behind the first portion 24A in the rotation direction r1. By the rotational movement of the bracket 30 centered on the rotation axis (A) in the rotation direction r1, the second portion 24B is pushed toward the coil end 11E. During this rotational movement, the first portion 24A held by the first holding portion 32 is in a state of being separated from the coil 11 and will not be in contact with the coil 11.

[0046] The cover 24 extends from a position in front of the heat-sensitive element 21 to a position in the rear of the connection portion 214. The cover 24 is long in the front-to-back direction and is formed in a strip shape. The cover 24 has a first portion 24A held by the bracket 30 and a second portion 24B pressed against the coil end 11E. The second portion 24B corresponds to the area of ​​the cover 24 on the heat-sensitive element 211 side. The first portion 24A corresponds to the area of ​​the cover 24 on the electric wire (213, 22) side.

[0047] The cover 24 of this embodiment has a cylindrical appearance, for example. However, the sensor unit 20 and the like are accommodated inside the cover 24. The diameter of the front end 24F of the cover 24 is smaller than the diameter of the rear side of the front end 24F. In addition, the appearance of the cover 24 is not limited to a circle, and can be any shape, for example, a rectangular shape.

[0048] The covering body 24 is formed into a predetermined shape by an elastic resin material such as fluororubber or silicone rubber. The elasticity of this embodiment means that the covering body 24 can be bent smoothly when the bracket 30 is rotated to push the second portion 24B onto the coil 11. As fluororubber, for example, there are polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer (PFA), etc. For example, by passing the heat-sensitive element 21 and the lead wire 22 through the inner side of a tube formed by PTFE, shrinking the tube by heating, and putting it into a metal mold for pressurization, the heat-sensitive element 21 and the lead wire 22 can be sealed with the covering body 24.

[0049] (bracket)

[0050] The bracket 30 attaches the sensor unit 20 to the housing 12 in a state where the second portion 24B of the cover 24 is pressed against the coil end 11E.

[0051] The bracket 30 includes a fixing portion 31 fastened to the housing 12 by means of a bolt 35, a first holding portion 32 holding the first portion 24A of the cover 24 and the tube 25, a second holding portion 33 holding the tube 25 in front of the first holding portion 32, and a locking portion 34 that is locked to the housing 12 when fastened. The first holding portion 32 holds the first portion 24A of the cover 24.

[0052] The bracket 30 of this embodiment is made of a metal plate material. The fixing portion 31, the first holding portion 32, the second holding portion 33 and the locking portion 34 are integrally formed by using a metal plate material such as stainless steel and performing machining such as punching and bending.

[0053] In addition, the bracket 30 is not limited to a metal plate, and may be formed using a resin material having required properties such as strength.

[0054] The fixing portion 31 corresponds to a flat base portion in which a screw hole 31A is formed in the plate thickness direction. The rotation axis (A) of the bracket 30 is hypothetically present at the center of the screw hole 31A. The fixing portion 31 is arranged around a hole (not shown) formed on the housing 12 for inserting the shaft portion of the bolt 35. The hole is formed in the axial direction D1 from the surface 12A of the housing 12. The shaft portion of the bolt 35 reaches the stator core via the screw hole 31A of the fixing portion 31 and the hole of the housing 12. If a torque is input to the head 35A of the bolt 35 in the rotation direction r1, the bracket 30 is tightly connected to the housing 12 by the axial force of the bolt 35 in the axial direction D1.

[0055] The tightening center A ( Figure 2 ) is set as the center of the clock face. If the second holding portion 33 is at the 12 o'clock position, the roughly locking portion 34 is at the 10 o'clock position, and the first holding portion 32 is at the 2 o'clock position.

[0056] Furthermore, when the bracket 30 is fixed between the bolt 35 and the housing 12 and the cover 24 is pressed against the coil end 11E, the front end 24F of the cover 24 is located behind the line segment L that connects the fastening center A and the coil end 11E at the shortest distance in the rotation direction r1 of the bracket 30. With respect to the line segment L, the first portion 24A and the first holding portion 32 are located in front of the rotation direction r1.

[0057] The first holding portion 32 is bent upward relative to the fixing portion 31. The fixing piece 321 formed on the upper end of the first holding portion 32 is bent toward the coil end 11E and presses the second portion 24B, so that the bracket 30 holds the cover 24 in a cantilevered state.

[0058] When the fixing portion 31 is fixed between the bolt 35 and the housing 12 by tightening the bolt 35 and the housing 12, the second portion 24B of the cover 24 is pressed against the coil end 11E. At this time, the cover 24 extends along the extension direction DC ( Figure 1 ), and tilts upward from the first portion 24A toward the second portion 24B.

[0059] The first holding portion 32 of the present embodiment holds the lead wires 22 in addition to the cover 24. The fixing piece 321 of the first holding portion 32 extends downward from the cover 24 and presses the tube 25 covering the third section 22C of the pair of lead wires 22.

[0060] The second holding portion 33 is bent upward relative to the fixing portion 31, similarly to the first holding portion 32. The second holding portion 33 is lower in height from the fixing portion 31 than the first holding portion 32. The fixing piece 331 formed on the upper end of the second holding portion 33 is bent toward the side close to the coil end 11E, and the tube 25 is pressed.

[0061] The second holding portion 33 is located below the front end 24F of the cover body 24 extending obliquely upward and forward from the first holding portion 32. Figure 2 As shown in the figure, the pipe 25 is inclined in a direction gradually moving away from the coil end 11E from the rear to the front in a plan view. Therefore, the pipe 25 moves away from the coil end 11E as it moves away from the second holding portion 33. The second holding portion 33 holds the pipe 25 substantially parallel to the fixing portion 31.

[0062] Contrary to the second holding portion 33 , the first holding portion 32 is inclined in a direction gradually approaching the coil end 11E from the rear toward the front in a plan view.

[0063] The locking portion 34 is bent downward relative to the fixing portion 31 at a position away from the fastening center A in the bracket 30. The locking portion 34 corresponds to the side surface 12B of the housing 12 as the locked portion. If the bracket 30 rotates following the rotation of the bolt 35 when fastened to the housing 12, the locking portion 34 is locked on the side surface 12B of the housing 12, so that the bracket 30 is restricted from further rotating.

[0064] In addition, the member that locks the locking portion 34 is not limited to the housing 12, and may be an appropriate member against which the locking portion 34 abuts during the fastening.

[0065] [Installation of temperature sensor by tightening with bolts]

[0066] As shown below Figure 4 (a) and Figure 4As described in (b) of FIG. 1 , by fastening the single bolt 35 to the housing 12 and fixing the bracket 30 to the housing 12 with the bolt 35 , the sensor unit 20 can be easily and reliably mounted to the housing 12 .

[0067] Here, the bracket 30 and the cover 24 held on the first holding portion 32 are configured so as to be able to be moved from Figure 4 As shown in (a), the first posture P1 in which the second portion 24B is not pressed against the coil end 11E is as shown in Figure 4 As shown in (b), the second portion 24B is rotated in the second posture P2 in which it is pressed against the coil end 11E.

[0068] Before being connected ( Figure 4 The bracket 30 in (a) is in the first posture P1 in which the second portion 24B is not pressed against the coil end 11E. Figure 4 Alternatively, the second portion 24B may be in contact with the coil end 11E as long as the rotation of the bracket 30 is not hindered.

[0069] If a torque in the rotation direction r1 is input to the right-handed threaded bolt 35, the bracket 30 follows the rotation of the bolt 35 due to the friction between the fixing portion 31 and the bolt 35, and rotates in the same direction as the rotation direction of the bolt 35 until the end of the rotation direction. Figure 4 In the second posture P2 shown in (b), the tight connection is completed. When the bracket 30 rotates from the first posture P1 to the second posture P2 with the tight connection center A as the center, the cover 24 held by the first holding portion 32 also rotates in the same direction as the bracket 30. In the example shown in the figure, the cover 24 is rotated from a state roughly along the circumferential direction D2 or the tangent line of the outer periphery of the coil 11 ( Figure 4 (a)), as the second portion 24B gradually approaches the coil end 11E from the rear toward the front, the second portion 24B is pressed against the coil end 11E from the side. The direction of the pressing force Pr of the cover 24 acting on the coil end 11E from the outside toward the inside in the radial direction D3 is indicated by an arrow.

[0070] At this time, the second portion 24B of the cover 24 is pressed against the coil end 11E along the coil wire C. When the second portion 24B is pressed against the coil end 11E, the distance L2 from the close center A to the pressing portion B of the second portion 24B against the coil end 11E becomes smaller than the distance L1 during the rotational action.

[0071] The elastic force of the cover 24 contributes to the pushing force Pr, and the second portion 24B contacts the coil end 11E with sufficient pressure to be maintained at a predetermined position under the condition of vibration or impact. That is, the cover 24 cooperates with the bracket 30 that rotates following the rotation of the bolt 35 to form a pushing mechanism that pushes the sensor unit 20 onto the coil end 11E.

[0072] In parallel with the rotation of the bolt 35, the bracket 30 and the cover 24, the bolt 35 also moves in the axial direction D1 to generate an axial force. If the locking portion 34 is abutted against the side surface 12B of the housing 12, the rotation of the bracket 30 is restricted, thereby preventing an excessive load from being applied to the thermal element 21 covered by the cover 24, and the bracket 30 can be firmly fastened to the housing 12 by rotating only the bolt 35.

[0073] [Effects of the present embodiment]

[0074] The main effects brought about by the temperature sensor 2 of the present embodiment are listed below.

[0075] According to the temperature sensor 2, the bracket 30 holding the cover 24 can be fixed to the housing 12 as the fixing object in a state where the cover 24 covering the heat-sensitive body 211 is elastically deformed and pressed against the coil 11. Therefore, according to the temperature sensor 2, it is possible to prevent the sensor unit 20 from being deviated from the specified position of the coil end 11E due to external forces such as vibration and impact, and maintain the state where the second portion 24B is pressed against the specified position of the coil end 11E with a specified pressure. In this way, the temperature of the coil 11 can be stably and accurately detected through the temperature detection performed by the heat-sensitive element 21 located at the second portion 24B.

[0076] According to temperature sensor 2, sensor unit 20 can be pressed toward coil end 11E by utilizing the elastic force of cover 24 covering heat-sensitive body 211, etc. Therefore, according to temperature sensor 2, since it is not necessary to provide another elastic member for obtaining elastic force, the number of components can be reduced and the structure can be simplified.

[0077] The bracket 30 is fixed to the housing 12 by fastening bolts 35 of the same specification as the bolts used to fix the stator core to the housing 12. Therefore, the temperature sensor 2 can be assembled to the stator 10 during the process of assembling the stator core to the housing 12. This improves the efficiency of the assembly work and reduces the number of parts to suppress costs.

[0078] The cover 24 held by the first holding portion 32 of the bracket 30 is arranged along the extension direction DC of the coil wire C, that is, inclined relative to the axial direction D1. As a result, compared with the case where the cover 24 is arranged along the axial direction D1 or along a direction orthogonal to the axial direction D1, the second portion 24B can be brought into close contact with the coil wire C over a larger contact area. Therefore, a larger heat transfer area from the coil 11 to the sensor unit 20 can be ensured, contributing to an improvement in detection accuracy.

[0079] The bracket 30 is securely fixed between the bolt 35 and the housing 12, and the sensor unit 20 and the bracket 30 are fixed at two locations, the first holding portion 32 and the second holding portion 33. Therefore, the sensor unit 20 is more stably held on the bracket 30 against external forces such as vibration and impact, thereby contributing to the stability and accuracy of temperature detection.

[0080] Since the first holding portion 32 stands upward from the fixing portion 31, the cover 24 held on the upper end of the first holding portion 32 is separated from the surface 12A of the housing 12, and a space of a predetermined volume is ensured between the housing 12 and the cover 24. In this way, the heat exchange between the stator 10 and the sensor unit 20 can be suppressed, and the influence of the stator 10 on the temperature detection of the coil 11 can be suppressed. In addition, the stator 10 has a larger heat capacity than the coil 11, and the temperature is lower than that of the coil 11 during the operation of the rotating electric machine.

[0081] The locking portion 34 is locked to the housing 12, thereby limiting the excessive rotation of the bracket 30 beyond the second posture P2. Thus, the bracket 30 can be firmly connected to the housing 12 while avoiding damage to the heat-sensitive body 211 and the like caused by excessive load.

[0082] [Variation]

[0083] In addition to the above, the configurations described in the above embodiments may be selected or modified to other configurations as appropriate without departing from the spirit of the present invention.

[0084] The cover 24 is not limited to an example in which the front end portion is pressed toward the coil end 11E, but may also be Figure 5 As in the example shown, the pressing portion B pressed against the coil end 11E is located rearward of the front end portion 24f. The front side expanded region Fx is expanded forwardly with respect to the cover 24 of the above-described embodiment.

[0085] In addition, the cover 24 is not limited to the example in which the rear end portion is held by the bracket 30, but may also be Figure 5 As shown in the example, the first holding portion 32 ( Figure 2) is located forward of the rear end portion 24r. The rear extension region Rx is extended rearward relative to the cover 24 of the above-mentioned embodiment. In addition, the portion of the cover 24 held by the bracket 30 does not necessarily need to be at Figure 5 The position indicated by H in the figure may also be present in the rear extension area Rx.

[0086] The front extension region Fx and the rear extension region Rx do not interfere with the coil end 11E during the rotation of the bracket 30. The rear extension region Rx may be curved relative to the middle region M toward a side away from the coil end 11E.

[0087] The temperature sensor of the present invention is fixed to the housing 12 of the stator 10 or other fixed object by means of the following Figure 6 In addition to using bolts 35 as shown in (a), it is also possible to Figure 6 As shown in (b) of FIG. 1 , a nut 37 as a female threaded member may be used. Figure 6 Rivet 38 is used as shown in (c).

[0088] The nut 37 is tightened on the male thread 121 that penetrates the screw hole of the housing 12. If a torque in the rotation direction r1 is applied to the nut 37, the bracket 30 also rotates around the rotation axis (A) following the rotation of the nut 37 due to friction between the nut 37 and the bracket 30, and the cover 24 is pushed toward the coil end 11E.

[0089] When the rivet 38 is used, since the rotation axis (A) exists in the screw hole 31A of the bracket 30 inserted into the shaft portion 381, the bracket 30 can be rotated before tightening to push the cover 24 onto the coil end 11E. In a state where the cover 24 is pushed toward the coil end 11E, it is preferred to apply an axial load to the rivet 38 to tighten.

[0090] Although not shown in the figure, the bracket 30 may be fixed to the housing 12 by supplying a flowing resin material or a molten metal material or the like to the inner space of the screw hole 31A of the bracket 30 and the hole of the housing 12 and solidifying the same. In this case, the bracket 30 is also fixed to the housing 12 in a state where the cover 24 is pressed toward the coil end 11E by rotating the bracket 30 around the rotation axis A.

[0091] The sensor unit 20 of the above-described embodiment is fixed to the bracket 30 by pressing the first portion 24A of the cover 24 with the fixing piece 321 of the first holding portion 32, but the sensor unit 20 may be fixed to the bracket 30 by an appropriate method other than pressing. For example, the first portion 24A may be held on the first holding portion 32 of the bracket 30 by using bolts or rivets. Alternatively, the first portion 24A may be fixed to the first holding portion 32 of the bracket 30 by insert molding in which the bracket 30 is arranged in a metal mold for molding the cover 24.

[0092] The lead wires 22 do not necessarily need to be folded back forward at the rear side of the cover 24. The lead wires 22 can be routed in an appropriate direction and an appropriate path while avoiding interference with the coil 11 or other components. Depending on the diameter of the coil end 11E, the mounting angle of the temperature sensor 2 to the coil end 11E, etc., the pair of lead wires 22 led out from the cover 24 may be extended backward in one direction at the rear side of the cover 24.

[0093] The second holding portion 33 for holding the lead wire 22 may be provided as necessary at an appropriate position of the bracket 30. For example, the second holding portion 33 may be disposed ahead of the first holding portion 32 in the rotation direction r1.

[0094] Assume that an upper limit of the tightening force (torque) of the tool for tightening the bolt 35 (or nut 37) is set. In this case, even if the locking portion 34 is not provided on the bracket 30, the bracket 30 can be reliably fixed by the axial force of the bolt 35 (or nut 37) when the fastening is completed, and the bracket 30 can be made stationary in the second posture P2 without applying an excessive load to the thermal element 21.

[0095] In addition, the male thread member used for fastening the bracket 30 is not limited to a bolt, and may be another member having a male thread, such as a screw.

[0096] The object to which the fixing portion 31 of the bracket 30 is fixed is not limited to the housing 12 , and may be another member of the stator 10 or a member disposed around the stator 10 .

[0097] Although the example in which the second portion 24B covers the heat-sensitive body 211 is shown, the present invention is not limited thereto. That is, as long as the heat-sensitive body 211 is provided near the second portion 24B and is pressed against the coil 11, the temperature detection is possible.

[0098] 〔Appendix〕

[0099] From the above disclosure, the following structures can be understood.

[0100] [1] A temperature sensor for detecting the temperature of a coil of a stator of a rotating electric machine, comprising: a sensor unit including a heat-sensitive body, an electric wire electrically connected to the heat-sensitive body, and a covering body covering a portion of the electric wire and the heat-sensitive body and formed of an elastic resin material; and a bracket holding the covering body in a cantilevered state and having a rotation axis; the bracket having a predetermined rotation axis and being configured so that the covering body can be pushed toward the coil by rotating the bracket in a predetermined direction.

[0101] [2] In the temperature sensor as described in item [1], the covering body comprises: a first portion which is relatively close to the rotation axis and is held by the bracket; and a second portion which is relatively close to the rotation axis and covers the heat-sensitive body; the second portion is located outside an imaginary circle which passes through the first portion and is centered on the rotation axis.

[0102] [3] In the temperature sensor described in item [2], the second portion is located behind the first portion in the direction of the rotational movement.

[0103] [4] In the temperature sensor described in item [3], when the covering body is pushed toward the coil, the second portion is located behind the line segment connecting the rotation axis and the coil at the shortest distance in the rotation direction; and the first portion is located in front of the line segment in the rotation direction.

[0104] [5] In the temperature sensor described in any one of [1] to [4], the bracket is fixed to the fixing object by means of a threaded component tightly connected to the fixing object; the covering body can be pushed toward the coil by the rotation of the bracket accompanied by the rotation of the threaded component for the tight connection with the fixing object.

[0105] [6] In the temperature sensor described in [5], the bracket is fixed to the housing serving as the fixing object together with the core by using the threaded member for tightly connecting the core of the stator to the housing of the stator.

[0106] [7] In the temperature sensor according to any one of [1] to [6], the bracket includes a locking portion that is locked to the locked portion in order to restrict excessive rotational movement.

[0107] [8] In the temperature sensor according to any one of [1] to [7], the covering body is arranged along the extending direction of the single wire of the coil.

[0108] [9] In the temperature sensor according to any one of [1] to [8], the bracket includes: a first holding portion that holds the cover; and a second holding portion that holds the electric wire in front of the first holding portion in the direction of the rotational movement.

[0109]

[10] In the temperature sensor described in any one of [1] to [9], the bracket comprises: a base having a screw hole formed therein through which the threaded member passes; a retaining portion bent relative to the base to retain the covering body; and the locking portion bent relative to the base in a direction opposite to the retaining portion.

[0110]

[11] A temperature sensor for detecting the temperature of a coil of a stator of a rotating electric machine, comprising: a sensor unit including a heat-sensitive body, an electric wire electrically connected to the heat-sensitive body, and a covering body formed of an elastic material and covering a portion of the electric wire and the heat-sensitive body; and a bracket holding the covering body in a cantilevered state and having a rotation axis; the covering body comprising: a first portion which is relatively short from the rotation axis and is held by the bracket; and a second portion which is relatively long from the rotation axis and covers the heat-sensitive body; the second portion is located outside an imaginary circle passing through the first portion and centered on the rotation axis.

[0111]

[12] A rotating electrical machine comprising: a stator including a core and a coil; a rotor rotating relative to the stator; and a temperature sensor according to any one of [1] to

[11] for detecting a temperature of the coil.

[0112] Description of symbols

[0113] 1 Rotating motor

[0114] 2 Temperature Sensor

[0115] 10 Stator

[0116] 11 Coil

[0117] 11E Coil terminal

[0118] 12 Housing (fixed object, locked part)

[0119] 12A Surface

[0120] 12B Side

[0121] 20 sensor units

[0122] 21 Thermal element

[0123] 22 Lead

[0124] 22A Section 1

[0125] 22B Section 2

[0126] 22C Section 3

[0127] 24 Covering body

[0128] 24A Part 1

[0129] 24B Part 2

[0130] 24F Front End

[0131] 25 tubes

[0132] 30 Bracket

[0133] 31 fixed part (base)

[0134] 31A screw hole

[0135] 32 1st holding part

[0136] 33. Second holding part

[0137] 34 stopper

[0138] 35 bolts (threaded parts)

[0139] 35A Head

[0140] 36 washers

[0141] 37 Nut (threaded part)

[0142] 38 Rivets

[0143] 121 Male thread

[0144] 211 Heat Sensing Body

[0145] 212 Sealed Body

[0146] 213 Clad Wire

[0147] 214 Connection parts

[0148] 221 core wire

[0149] 222 Insulation Cover

[0150] 321 Fixing plate

[0151] 331 Fixing plate

[0152] 381 Shaft

[0153] A Connection center (rotation axis)

[0154] B Pushing part

[0155] C Coil Single Wire

[0156] D1 Axial

[0157] D2 Circumferential

[0158] D3 radial

[0159] DC extension direction

[0160] F front

[0161] Fx front extension area

[0162] H Retained part

[0163] M Middle area

[0164] R after

[0165] Rx rear extension area

[0166] Pr Pushing force

[0167] L segment

[0168] L1, L2 distance

[0169] P1 Pose 1

[0170] P2 Posture 2

[0171] r1 Rotation direction

[0172] VC imaginary circle

Claims

1. A temperature sensor for detecting the temperature of a coil provided in a stator of a rotating electrical machine, characterized in that: have: A sensor unit including a heat-sensitive body, an electric wire electrically connected to the heat-sensitive body, and a covering body which covers a part of the electric wire and the heat-sensitive body and is formed of an elastic resin material; and The bracket holds the cover in a cantilevered manner and has a rotation axis. The above-mentioned covering body has: The first portion is relatively short from the rotation axis and is held by the bracket; and The second portion is relatively far from the rotation axis and covers the heat-sensitive body. The second portion is located outside an imaginary circle passing through the first portion and centered at the rotation axis. The cover body is configured to be pressed toward the coil by the rotation of the bracket in a predetermined direction.

2. The temperature sensor according to claim 1, characterized in that The second portion is located rearward of the first portion in the direction of the rotational motion.

3. The temperature sensor according to claim 2, characterized in that When the cover is pressed toward the coil, the second portion is located behind the line segment connecting the rotation axis and the coil at the shortest distance in the direction of the rotation action. The first portion is located forward of the line segment in the direction of the rotational movement.

4. The temperature sensor according to claim 1, characterized in that The bracket is fixed to the fixed object by a threaded part tightly connected to the fixed object. The covering body is configured to be pressed toward the coil by a rotational movement of the bracket accompanying the rotation of the screw member for the tightening to the fixing object.

5. The temperature sensor according to claim 4, characterized in that The bracket is fixed to the housing as the fixing object together with the core by the screw member for fastening the core of the stator to the housing of the stator.

6. The temperature sensor according to claim 4, characterized in that The bracket includes a locking portion that is locked to the locked portion in order to restrict excessive rotational movement.

7. The temperature sensor according to claim 1, characterized in that The covering body is arranged along an extending direction in which the single wire of the coil extends.

8. The temperature sensor according to claim 1, characterized in that The above bracket includes: a first holding portion that holds the covering body; and The second holding portion holds the electric wire in front of the first holding portion in the direction of the rotational movement.

9. The temperature sensor according to claim 6, characterized in that: The bracket has: The base is formed with a screw hole through which the threaded member passes; a holding portion that is bent relative to the base portion to hold the cover; and The locking portion is bent relative to the base portion in a direction opposite to the holding portion.

10. A rotating electrical machine, characterized in that: have: stator, including core and coil; a rotor that rotates relative to the stator; and The temperature sensor according to any one of claims 1 to 9 is used to detect the temperature of the coil.

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