Temperature detector

Abstract

To provide a temperature detector in which a thermistor is appropriately arranged in a rotational electric machine having the thermistor for detecting a temperature of a coil.SOLUTION: A temperature detector is a temperature detector provided to a rotary electric machine 1, that comprises: a stator core 10; and a coil 40 wound to the stator core 10. The temperature detector comprises: an insulator 20 which is arranged between the stator core 10 and the coil 40, and of which one side of a direction orthogonal to a winding shaft direction of the coil 40 is contacted to the iron core 10, and the other side includes a winding part 21 contacted to the coil 40, and which electrically insulates a space between the stator core 10 and the coil 40; a thermistor 50 that is embedded into the winding part 21, and detects a temperature of the coil 40; and a terminal 60 that is connected to the thermistor 50 in an inner part of the insulator 20, and is led to an external part of the insulator 20.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a temperature detection device. [Background technology]

[0002] In recent years, efforts to realize a low-carbon or carbon-free society have been intensifying, and research and development of electrification technology has been conducted in vehicles to reduce CO2 emissions and improve energy efficiency. An electric vehicle includes a rotating electric machine as a prime mover. The rotating electric machine includes a stator around which a coil is wound, and a rotor that is rotatably provided relative to the stator. The stator includes a stator core around which a coil is wound. An insulator is attached to the stator core to electrically insulate the stator core from the coil. The stator may be provided with a temperature detection element that detects the temperature of the coil (see, for example, Patent Document 1). Patent Document 1 discloses an insulating bobbin that houses a stator core on its inner circumference and has a winding wound around its outer circumference in a layered manner, the insulating bobbin having a winding surface around which the winding is wound in a layered manner, and a temperature detection element fixing groove formed on the winding surface for fixing a temperature detection element that detects the temperature of the winding. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5444770 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the field of electrification technology, rotating electric machines have the following problems. If the temperature detection element is exposed on the winding surface of the insulator, the winding may come into contact with the temperature detection element, causing irregular winding of the coil. If irregular winding occurs in the coil, the generated magnetic field may be disturbed, and the efficiency of the rotating electric machine may decrease. In addition, if the winding comes into contact with the temperature detection element, stress may be applied to the temperature detection element during the coil winding work. If excessive stress is applied to the temperature detection element, the temperature of the coil cannot be detected accurately, and it may be difficult to maintain the rotating electric machine in a desired state. Therefore, there is room for improvement in the arrangement of the temperature detection element in conventional rotating electric machines.

[0005] In order to solve the above-mentioned problems, the present application aims to appropriately arrange a thermistor in a rotating electrical machine that includes a thermistor for detecting the temperature of a coil, thereby contributing to improving energy efficiency. [Means for solving the problem]

[0006] The temperature detection device according to the first aspect of the present invention is a temperature detection device provided in a rotating electric machine (1) having an iron core (10) and a coil (40) wound around the iron core (10), and includes an insulator (20) that is arranged between the iron core (10) and the coil (40) and has a winding portion (21) in which one side in a direction perpendicular to the winding axis direction of the coil (40) contacts the iron core (10) and the other side contacts the coil (40), and electrically insulates between the iron core (10) and the coil (40), a thermistor (50) that is embedded in the winding portion (21) and detects the temperature of the coil (40), and a terminal (60) that is connected to the thermistor (50) inside the insulator (20) and extended to the outside of the insulator (20).

[0007] According to the first aspect, since the thermistor is embedded in the winding portion, the coil does not come into contact with the thermistor. This makes it possible to suppress winding irregularities of the coil and to suppress disturbances in the generated magnetic field caused by the winding irregularities. In addition, since the coil does not come into contact with the thermistor, when the coil is wound around the winding portion, it is possible to suppress the tension of the coil being transmitted to the thermistor and applying excessive stress to the thermistor. As described above, a temperature detection device in which the thermistor is appropriately arranged can be provided.

[0008] A temperature detection device according to a second aspect of the present invention is the temperature detection device according to the first aspect, wherein the winding portion (21) has a winding surface (22) in contact with the coil (40), and the thermistor (50) may be located between the winding surface (22) and the iron core (10) in a direction intersecting the winding axis direction.

[0009] According to the second aspect, the temperature of the coil at a location close to the inner circumference can be measured by the thermistor, making it possible to measure the temperature of the coil with high accuracy.

[0010] A temperature detection device according to a third aspect of the present invention is the temperature detection device according to the first or second aspect, wherein the insulator (20) is formed with an accommodating recess (30) in which the thermistor (50) is accommodated, and the temperature detection device further includes a filler (70) that fills the accommodating recess (30), and a portion of the terminal (60) is located in the accommodating recess (30) and connected to the thermistor (50).

[0011] According to the third aspect, the filler can restrict deformation of the wound portion that would cause the accommodating recess to shrink, thereby more reliably preventing the tension of the coil from being transmitted to the thermistor and causing excessive stress to be applied to the thermistor.

[0012] A temperature detection device according to a fourth aspect of the present invention is a temperature detection device according to any one of the first to third aspects, wherein the insulator (20) is formed with an accommodating recess (30) in which the thermistor (50) is accommodated, the insulator (20) has wall surfaces (35, 36) defining the accommodating recess (30), and the wall surfaces (35, 36) may have a recess (37) into which a portion of the thermistor (50) fits.

[0013] According to the fourth aspect, since the thermistor engages with the opening edge of the recess, it is possible to prevent the thermistor from shifting in position, thereby improving the positional accuracy of the thermistor 50. Effect of the Invention

[0014] According to the present invention, it is possible to provide a temperature detection device in which temperature detection elements are appropriately arranged. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a perspective view of a portion of a stator according to an embodiment. [Diagram 2] 2 is a view of a part of the stator shown in FIG. 1 as viewed from the axial direction. [Diagram 3] FIG. 2 is a perspective view of a first insulator according to the embodiment. [Figure 4] FIG. 2 is a perspective view of a thermistor and a terminal. [Diagram 5] FIG. 4 is a view of the thermistor and terminals as viewed from the outside in the radial direction. [Figure 6] FIG. 4 is a view of the thermistor and terminals as viewed in the circumferential direction. [Figure 7] FIG. 3 is a cross-sectional view taken along line VII-VII in FIG. [Figure 8] 8 is a cross-sectional view taken along a line VIII-VIII in FIG. 7. [Figure 9] 9 is a cross-sectional view taken along a line corresponding to line IX-IX in FIG. 8. [Figure 10] 4 is a view of the stator according to the embodiment, showing the periphery of an accommodating recess from the outside in the radial direction. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, components having the same or similar functions are denoted by the same reference numerals. In addition, duplicate descriptions of those components may be omitted.

[0017] The rotating electric machine 1 of this embodiment is an inner rotor type three-phase permanent magnet synchronous motor. The rotating electric machine 1 is a driving motor mounted on a vehicle such as an electric two-wheeler. The rotating electric machine 1 includes a rotor that rotates integrally with a rotating shaft, and a stator 3 that surrounds the rotor. The rotor and the stator 3 are arranged coaxially. In the following description, the direction in which the common axis of the rotor and the stator 3 extends is referred to as the axial direction, the direction perpendicular to the common axis is referred to as the radial direction, and the direction revolving around the common axis is referred to as the circumferential direction. In addition, in the drawings used in the following description, the arrow A indicates the axial direction, the arrow R indicates the radial direction, and the arrow P indicates the circumferential direction, respectively.

[0018] Fig. 1 is a perspective view of a portion of a stator according to an embodiment of the present invention, Fig. 2 is a view of the portion of the stator shown in Fig. 1 as seen from the axial direction. 1 and 2, the stator 3 includes a stator core 10 (iron core), an insulator 20, and a coil 40. In this embodiment, the winding axis direction of the coil 40 coincides with the radial direction.

[0019] The stator core 10 is formed by arranging a plurality of split cores 11 in an annular shape along the circumferential direction. For example, the split cores 11 are formed by stacking a plurality of T-shaped electromagnetic steel sheets punched by a press. The split cores 11 include back yoke pieces 12 extending along the circumferential direction and teeth 13 extending radially inward from the back yoke pieces 12. The back yoke pieces 12 form an annular back yoke of the stator core 10 by connecting the split cores 11 in the circumferential direction. The teeth 13 form slots 14 between adjacent teeth 13 by connecting the split cores 11 in the circumferential direction. The radially inner ends of the teeth 13 face the magnetic pole portions of the rotor.

[0020] The insulators 20 are attached to each of the split cores 11 so as to surround the teeth 13. The insulators 20 are made of an electrically insulating material such as resin. For example, the insulators 20 are made of polyphenylene sulfide. The insulators 20 include a winding portion 21 that is arranged along the outer peripheral surface of the teeth 13, an inner flange 24 that protrudes from a radially inner edge of the winding portion 21, and an outer flange 25 that protrudes from a radially outer edge of the winding portion 21. The winding portion 21 is disposed between the teeth 13 and the coil 40, and one side of the winding portion 21 in a direction perpendicular to the winding axis direction of the coil 40 contacts the stator core 10, and the other side contacts the coil 40. The winding portion 21 has a winding surface 22 that contacts the coil 40 from its inner peripheral side (see FIG. 3).

[0021] The winding portion 21 includes a first end surface covering portion 21a that covers a first end surface of the tooth 13 facing a first axial direction, a second end surface covering portion (not shown) that covers a second end surface of the tooth 13 facing a second axial direction, and a pair of side surface covering portions 21c that cover a pair of side surfaces facing the circumferential direction (see also FIG. 3). The inner flange 24 and the outer flange 25 extend to surround the entire circumference of the tooth 13. The outer flange 25 is aligned along the inner peripheral surface of the back yoke piece 12. A winding groove 28 is formed between the inner flange 24 and the outer flange 25, in which the coil 40 wound around the winding portion 21 is disposed. The outer flange 25 has a protrusion 26 that is located in the first direction of the back yoke piece 12 of the split core 11 when viewed from the radial direction.

[0022] Fig. 3 is a perspective view of the first insulator according to the embodiment, in which a filler 70, which will be described later, has not yet been placed. As shown in Figs. 1 and 3, the insulator 20 is divided into two parts, a first insulator 201 and a second insulator 202. The division positions of the first insulator 201 and the second insulator 202 are located at positions corresponding to the axial middle parts of the teeth 13. The middle parts may be located between one end and the other end of the teeth 13 in the axial direction. The insulator 20 is divided in the axial direction such that the division positions of the first insulator 201 and the second insulator 202 are located at each side surface covering portion 21c. In other words, the first insulator 201 has the entire first end face covering portion 21a.

[0023] 3, a thermistor 50 and terminals 60 are incorporated in the insulator 20. The peripheral structure of the thermistor 50 and terminals 60 will be described later.

[0024] 1 and 2, coils 40 are formed by winding wire around teeth 13 via insulators 20. Stator 3 is provided with a U-phase coil, a V-phase coil, and a W-phase coil. One of coils 40, the U-phase coil, the V-phase coil, and the W-phase coil, is wound around each split core 11. Coils 40 are wound around teeth 13 via insulators 20 by concentrated winding.

[0025] The following describes the peripheral structure of the thermistor 50 and terminal 60. The thermistor 50 is an example of a temperature detection element. Fig. 4 is a perspective view of the thermistor and terminals, Fig. 5 is a view of the thermistor and terminals as viewed from the outside in the radial direction, and Fig. 6 is a view of the thermistor and terminals as viewed from the circumferential direction. As shown in Figures 3 to 6, the thermistor 50 includes an element body 51 and a pair of lead wires 52 extending from the element body 51. The element body 51 includes a resistor 51a and a glass portion 51b covering the resistor 51a (see Figure 9). The pair of lead wires 52 are electrically connected to the resistor 51a. The pair of terminals 60 are made of a metal material. The pair of terminals 60 are electrically connected to the pair of lead wires 52 of the thermistor 50 in a one-to-one relationship.

[0026] Fig. 7 is a cross-sectional view taken along line VII-VII in Fig. 2. Fig. 8 is a cross-sectional view taken along a position corresponding to line VIII-VIII in Fig. 7. In Fig. 8, the filler 70 is shown by an imaginary line. As shown in FIG. 7 and FIG. 8, the thermistor 50 is embedded in the insulator 20 by being accommodated in an accommodating recess 30 formed in the insulator 20. The accommodating recess 30 is formed in the first insulator 201. At least a part of the accommodating recess 30 is located in the wound portion 21 of the insulator 20. The accommodating recess 30 is formed in the first end face covering portion 21a and overlaps with the teeth 13 when viewed from the axial direction. In this embodiment, the accommodating recess 30 overlaps with the circumferential center position of the first end face of the teeth 13. The accommodating recess 30 extends radially outward from the position overlapping with the teeth 13 when viewed from the axial direction and opens on the outer peripheral surface of the insulator 20 (the outer peripheral surface of the outer flange 25). The accommodating recess 30 communicates with a space in the first direction of the back yoke piece 12 of the split core 11 through an opening 31 on the outer peripheral surface of the insulator 20. The accommodating recess 30 is not open on the inner circumferential surface and the outer circumferential surface (winding surface 22) of the winding portion 21. As a result, the accommodating recess 30 does not communicate with the space in which the teeth 13 are arranged and the winding groove 28. In this embodiment, the accommodating recess 30 is open only on the outer circumferential surface of the insulator 20.

[0027] As shown in FIG. 8 , the accommodating recess 30 includes a wide portion 32 and a narrow portion 33. The wide portion 32 extends radially inward from the opening 31. The narrow portion 33 communicates with the wide portion 32 on the side opposite the opening 31. The circumferential width of the narrow portion 33 is smaller than the circumferential width of the wide portion 32. The narrow portion 33 is connected to a circumferential middle portion of the wide portion 32. The narrow portion 33 extends radially inward from a connection portion with the wide portion 32. The circumferential width of the narrow portion 33 is larger than the width of the element body 51 of the thermistor 50.

[0028] FIG. 9 is a cross-sectional view taken along a line corresponding to line IX-IX in FIG. 9, the insulator 20 has walls that define the accommodating recess 30. The walls have a first wall surface 35 facing a first axial direction and a second wall surface 36 facing a second axial direction. The first wall surface 35 and the second wall surface 36 each extend in a direction perpendicular to the axial direction and are parallel to each other. The distance between the first wall surface 35 and the second wall surface 36 is set to be approximately equal to or less than the thickness of the element body 51 of the thermistor 50.

[0029] As shown in FIG. 8 and FIG. 9, the first wall surface 35 is formed with a recess 37 extending in the extension direction (radial direction) of the accommodating recess 30. The recess 37 extends from the opening 31 through the wide portion 32 to the narrow portion 33. In this embodiment, the recess 37 extends over the entire length of the accommodating recess 30. The recess 37 extends in the radial direction with a constant width along the circumferential width center of the narrow portion 33. The width of the recess 37 is smaller than the circumferential width of the narrow portion 33 and smaller than the width of the element body 51 of the thermistor 50. The second wall surface 36 is formed with a recess 37 in the same manner as the first wall surface 35. The recess 37 of the second wall surface 36 is formed at a position facing the recess 37 of the first wall surface 35 in the axial direction. The recess 37 of the second wall surface 36 is formed in the same manner as the recess 37 of the first wall surface 35.

[0030] As shown in FIG. 8, the element body 51 of the thermistor 50 is disposed in the narrow width portion 33 of the accommodating recess 30. The element body 51 is located inside the winding portion 21. That is, the element body 51 is located between the winding surface 22 and the teeth 13 in the axial direction so as to overlap the teeth 13 and the coil 40 when viewed from the axial direction (see FIG. 7). The element body 51 is disposed in the accommodating recess 30, so that the insulator 20 is interposed between the coil 40 and the teeth 13. As a result, the element body 51 is not in contact with the coil 40 and the stator core 10, and does not directly face the coil 40 and the stator core 10. The element body 51 overlaps the circumferential center position of the first end face of the tooth 13. The element body 51 is disposed in a central region when the formation range of the winding groove 28 is divided into three equal parts in the radial direction.

[0031] 9, the element body 51 is sandwiched between the first wall surface 35 and the second wall surface 36 of the insulator 20. The element body 51 fits into the recesses 37 of the first wall surface 35 and the recesses 37 of the second wall surface 36. By fitting into the recesses 37 of the first wall surface 35 and the recesses 37 of the second wall surface 36, the element body 51 engages with the opening edges of the recesses 37 to restrict displacement in a direction intersecting the radial direction.

[0032] 8, the pair of lead wires 52 extend from the element body 51 toward the opening 31. Each lead wire 52 has a base end 52a connected to the element body 51 and extending radially through the narrow portion 33, and a tip end 52b bent from an end of the base end 52a opposite the element body 51 and extending circumferentially through the wide portion 32. The tip ends 52b of the pair of lead wires 52 extend circumferentially so as to be separated from each other. The entirety of each lead wire 52 is disposed in the accommodating recess 30.

[0033] 10 is a view of the periphery of the installation recess in the stator according to the embodiment, as viewed from the outside in the radial direction, in which the filler 70 is not yet disposed. As shown in FIG. 3 and FIG. 10, each terminal 60 is insert molded together with the insulator 20. A pair of terminals 60 are arranged at an interval in the circumferential direction. Each terminal 60 is connected to the thermistor 50 inside the insulator 20 and is drawn out to the outside of the insulator 20. Each terminal 60 includes a covering portion 61 covered by the insulator 20, and an outer extending portion 62 and an inner extending portion 63 extending from the insulator 20 and exposed to the outside of the insulator 20. The outer extending portion 62 protrudes in the first direction from the end face of the protruding portion 26 in the first direction. The inner extending portion 63 protrudes into the accommodating recess 30. The inner extending portion 63 is arranged along a wall surface that defines the wide portion 32 of the accommodating recess 30 from the inside in the radial direction. In other words, the inner extending portion 63 is arranged at a position that can be directly seen from the outside in the radial direction through the opening 31. The tip end 52b of the lead wire 52 is joined to and overlaps the inner extending portion 63 from the outside in the radial direction. The covering portion 61 extends axially from the inner extending portion 63 inside the protruding portion 26 to connect the outer extending portion 62 and the inner extending portion 63. The covering portion 61 is entirely covered by the insulator 20.

[0034] As shown in FIG. 7, the accommodating recess 30 is filled with a filler 70. The filler 70 is made of an electrically insulating material. The filler 70 is made of a material different from that of the insulator 20. For example, the filler 70 is an epoxy resin. The filler 70 is arranged so as to cover the entire element body 51 of the thermistor 50. For example, the filler 70 fills at least the entire narrow portion 33. Furthermore, the filler 70 fills at least a part of the wide portion 32 so as to cover the inner extension portion 63 of the terminal 60 and the entire lead wire 52. The filler 70 is arranged so as not to protrude from the opening 31.

[0035] The first insulator 201 is insert-molded together with the pair of terminals 60. The first insulator 201 is integrated with the pair of terminals 60 in a state where the inner extension 63 of each terminal 60 is exposed radially outward in the accommodating recess 30. The thermistor 50 is inserted into the accommodating recess 30 of the first insulator 201, and the tip 52b of the lead wire 52 is overlapped with the inner extension 63 of the terminal 60. For example, the lead wire 52 and the terminal 60 are joined to each other by ultrasonic welding, spot welding, soldering, or the like. When the lead wire 52 and the terminal 60 are joined by ultrasonic welding, an ultrasonic vibrator is inserted into the accommodating recess 30 from the opening 31, and the lead wire 52 and the terminal 60 are joined in the accommodating recess 30. With the thermistor 50 fixed to the pair of terminals 60, the filler 70 is filled into the accommodating recess 30. This completes the first insulator 201 with the thermistor 50 and the terminal 60 built in. A portion of the stator 3 shown in Figure 1 is completed by combining the first insulator 201 with the second insulator 202 and attaching them to the split core 11, and winding the coil 40 around the winding portion 21 of the insulator 20 consisting of the first insulator 201 and the second insulator 202.

[0036] As described above, the rotating electric machine 1 of the present embodiment has a temperature detection device including the insulator 20 having the winding portion 21 arranged between the stator core 10 and the coil 40, the thermistor 50 embedded in the winding portion 21 to detect the temperature of the coil 40, and the terminal 60 connected to the thermistor 50 inside the insulator 20 and drawn out to the outside of the insulator 20. According to this configuration, since the thermistor 50 is embedded in the winding portion 21, the coil 40 does not come into contact with the thermistor 50. Therefore, it is possible to suppress the winding disorder of the coil 40 and the disturbance of the generated magnetic field caused by the winding disorder. In addition, since the coil 40 does not come into contact with the thermistor 50, it is possible to suppress the tension of the coil 40 being transmitted to the thermistor 50 and the application of excessive stress to the thermistor 50 when the coil 40 is wound around the winding portion 21. As described above, a temperature detection device in which the thermistor 50 is appropriately arranged can be provided.

[0037] The thermistor 50 is located between the winding surface 22 and the stator core 10 in the axial direction. With this configuration, the thermistor 50 can measure the temperature of a portion of the coil 40 near the inner periphery. Therefore, the temperature of the coil 40 can be measured with high accuracy.

[0038] The insulator 20 is formed with an accommodating recess 30 in which the thermistor 50 is accommodated. The temperature detection device further includes a filler 70 that fills the accommodating recess 30. A portion of the terminal 60 is located in the accommodating recess 30 and is connected to the thermistor 50. With this configuration, the filler 70 can regulate deformation of the winding portion 21 that would cause the accommodating recess 30 to shrink. This makes it possible to more reliably prevent the tension of the coil 40 from being transmitted to the thermistor 50 and causing excessive stress to be applied to the thermistor 50.

[0039] The insulator 20 has a first wall surface 35 and a second wall surface 36 that define the accommodating recess 30. The first wall surface 35 and the second wall surface 36 have a recess 37 into which a portion of the thermistor 50 fits. With this configuration, the thermistor 50 engages with the opening edge of the recess 37, thereby preventing the thermistor 50 from shifting in position. This improves the positional accuracy of the thermistor 50.

[0040] The element body 51 of thermistor 50 is disposed in a central region when the formation range of winding groove 28 is divided into thirds in the radial direction. With this configuration, the temperature of the radial central portion of coil 40, which is more likely to become hot, can be measured by thermistor 50. Therefore, the temperature of coil 40 can be measured with high accuracy.

[0041] The element body 51 of thermistor 50 is covered with filler 70. This configuration makes it possible to prevent excessive stress from being applied to glass part 51b of element body 51 due to the tension of coil 40 transmitted to element body 51 when coil 40 is wound, vibrations during operation of rotating electric machine 1, and the like.

[0042] The present invention is not limited to the above-described embodiment explained with reference to the drawings, and various modifications are possible within the technical scope of the present invention. For example, in the above embodiment, the coil 40 is wound around the teeth 13 by concentrated winding, but the coil may be wound around the teeth by distributed winding.

[0043] In the above embodiment, the teeth 13 extend in the axial direction, but the teeth may extend in a direction inclined relative to the axial direction, and the stator core may be skewed.

[0044] In the above embodiment, the present invention is applied to a radial gap type rotating electric machine in which the stator and the rotor have a magnetic gap in the radial direction. However, the present invention may also be applied to an axial gap type rotating electric machine in which the stator and the rotor have a magnetic gap in the axial direction.

[0045] In the above embodiment, the filler 70 is filled in the accommodating recess 30 of the insulator 20, but the present invention is not limited to this configuration. That is, the accommodating recess 30 does not have to be filled with a filler, and the accommodating recess 30 may have a space surrounding at least a portion of the thermistor 50.

[0046] In the above embodiment, the insulator 20 is divided into the first insulator 201 and the second insulator 202, but the insulator does not have to be divided. The thermistor may be embedded at any position in the winding part of the insulator. That is, the thermistor may be located between the winding surface and the stator core in a direction intersecting the winding axis direction of the coil.

[0047] In the above embodiment, the element body 51 of the thermistor 50 is sandwiched from both sides in the axial direction by the wall surfaces that define the accommodating recess 30, but this configuration is not limited to this. The element body may be sandwiched from both sides in the circumferential direction by the wall surfaces that define the accommodating recess. Furthermore, the element body may be arranged in a floating state with respect to the wall surfaces that define the accommodating recess. Also, in the above embodiment, a pair of recesses 37 that engage with the element body 51 are formed on both sides in the axial direction of the element body 51 on the wall surfaces that define the accommodating recess 30, but this configuration is not limited to this. The above effect can be achieved as long as at least one recess that engages with the element body is formed, but it is not necessary that a recess is formed.

[0048] In addition, the components in the above-described embodiments can be replaced with well-known components as appropriate without departing from the spirit of the present invention. [Explanation of symbols]

[0049] REFERENCE SIGNS LIST 1... rotating electric machine 10... stator core (iron core) 20... insulator 21... winding portion 22... winding surface 30... accommodation recess 35... first wall surface (wall surface) 36... second wall surface (wall surface) 37... recess 40... coil 50... thermistor 60... terminal 70... filler

Claims

1. A temperature detection device provided in a rotating electric machine (1) including an iron core (10) and a coil (40) wound around the iron core (10), an insulator (20) that is disposed between the iron core (10) and the coil (40), has a winding portion (21) that is in contact with the iron core (10) on one side in a direction perpendicular to the winding axis direction of the coil (40) and is in contact with the coil (40) on the other side, and electrically insulates the iron core (10) from the coil (40); a thermistor (50) embedded in the winding portion (21) for detecting the temperature of the coil (40); a terminal (60) connected to the thermistor (50) inside the insulator (20) and drawn out to the outside of the insulator (20); A temperature detection device comprising:

2. The winding portion (21) has a winding surface (22) in contact with the coil (40), The thermistor (50) is located between the winding surface (22) and the iron core (10) in a direction intersecting the winding axis direction. The temperature detection device according to claim 1 .

3. The insulator (20) is formed with an accommodating recess (30) for accommodating the thermistor (50), Further provided is a filler (70) for filling the receiving recess (30), A portion of the terminal (60) is located in the receiving recess (30) and is connected to the thermistor (50). The temperature detection device according to claim 1 or 2.

4. The insulator (20) is formed with an accommodating recess (30) for accommodating the thermistor (50), The insulator (20) has wall surfaces (35, 36) that define the receiving recess (30), The wall surfaces (35, 36) have a recess (37) into which a part of the thermistor (50) fits. The temperature detection device according to claim 1 or 2.

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