JP2012244703A - Stator of electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator of electric motor capable of easily exchanging a temperature detection element.SOLUTION: A salient pole concentrated winding stator 10 includes a stator core 11 and a coil 13 wound round the stator core 11, and further includes a thermistor 70 having a temperature sensitive part 71 for detecting the temperature of the coil 13 and a cover member 80 for covering a part of the coil and the temperature sensitive part 71. An inside of the cover member 80 is partitioned by a projecting part 84 to a thermistor housing section 81 wherein the thermistor 70 is housed, a coil housing section 82 wherein a part of the coil 13 is housed, and an insulated space 86 positioned between the thermistor housing section 81 and the coil housing section 82.

Description

  The present invention relates to a stator of an electric motor provided with a temperature detection element.

  Conventionally, as shown in FIG. 11, a temperature measurement sensor 151 (temperature detection element) including a temperature measurement element 152 (temperature sensing unit) is disposed apart from the coil end 122b of the stator coil of the electric motor. The temperature of the stator coil is detected by the temperature sensor 151 detecting the temperature of the lead conductor 122c drawn from 122b (for example, Patent Document 1). As a result, it becomes difficult for oil 140, which is a cooling medium for cooling the stator coil to penetrate the coil end 122b, to cool the temperature sensor 151, and the temperature detection accuracy of the temperature sensor 151 by the oil 140 is reduced. Can be prevented. The temperature sensor 151 is covered with a heat insulator 156 together with at least a part of the lead conductor 122c. As a result, even when the oil 140 moves toward the temperature sensor 151, the heat insulator 156 can prevent the oil 140 from directly contacting the temperature sensor 151 and cooling the temperature sensor 151. A decrease in temperature detection accuracy of the temperature sensor 151 can be further prevented.

  In the stator of the electric motor described in Patent Document 1, a space inside the heat insulator 156 is filled with an element protection insulating layer 153 such as resin in order to ensure insulation between the lead conductor 122c and the temperature measuring element 152.

JP 2011-30288 A

  However, in the stator of the electric motor described in Patent Document 1, since the element protective insulating layer 153 is formed around the temperature measuring element 152, it is difficult to remove only the temperature measuring element 152, and the temperature measuring element 152 is replaced. In this case, the heat insulator 156 and the lead conductor 122c are required to be replaced together with the temperature measuring element 152, and there is a problem that the replacement process becomes complicated and the cost required for the replacement increases.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a stator for an electric motor that facilitates replacement of a temperature detection element.

In order to achieve the above object, the invention according to claim 1
A stator core (for example, a stator core 11 in an embodiment described later);
A stator of an electric motor (e.g., salient pole concentrated winding stator 10 in an embodiment described later) including a coil wound around the stator core (e.g., a coil 13 in an embodiment described later),
The stator includes a temperature detecting element (for example, a thermistor 70 in an embodiment to be described later) having a temperature sensing section (for example, a temperature sensing portion 71 in an embodiment to be described later) that detects the temperature of the coil, and a part of the coil. And a cover member (for example, a cover member 80 in an embodiment described later) that covers the temperature sensing part,
The inside of the cover member is a temperature detection element accommodating portion (for example, a thermistor accommodation in an embodiment described later) by a partition portion (for example, protrusions 84, 84a, 84b in the embodiment described later). Part 81), a coil housing part in which a part of the coil is housed (for example, a coil housing part 82 in an embodiment described later), and an insulation positioned between the temperature detecting element housing part and the coil housing part. It is characterized by being partitioned into a space (for example, an insulating space 86 in an embodiment described later).

In addition to the configuration of claim 1, the invention according to claim 2
The partition portion is a protruding portion that protrudes inside the cover member (for example, protruding portions 84, 84a, and 84b in embodiments described later),
At least one of a part of the coil and an end of the temperature detection element is in contact with the protrusion.

In addition to the configuration of claim 1 or 2, the invention according to claim 3
The cover member includes a coil insertion hole into which a part of the coil is inserted (for example, a coil insertion hole 82a in an embodiment described later) and a temperature detection element insertion hole into which the temperature detection element is inserted (for example, described later). The thermistor insertion hole 81a) in the embodiment is provided separately.

In addition to the structure of any one of Claims 1-3, the invention which concerns on Claim 4
The temperature detecting element is elastically fixed to the cover member.

In addition to the configuration of any one of claims 1 to 4, the invention according to claim 5
The stator core has a plurality of teeth (for example, teeth 11b in the embodiments described later) that are arranged at predetermined intervals in the circumferential direction and project radially.
The coil is composed of a plurality of coils (for example, a coil 13 in an embodiment described later) wound around the teeth with salient pole concentrated winding so as to be different from each other in the teeth adjacent in the circumferential direction.
Each of the plurality of coils includes a first winding end (for example, a first winding end 41 in an embodiment described later) and a second winding end (for example, a second winding in an embodiment described later) that are respectively positioned on one axial end side of the stator. Winding end 42),
Extending at least one of the first winding end and the second winding end in a circumferential direction across a coil having a different phase;
One end portion of the first winding end (for example, an end portion 41a in the embodiment described later) and the other end portion of the second winding end (for example, an embodiment described later) of the coils having the same phase adjacent to each other in the circumferential direction. End portion 42a) is joined to form a joined portion (for example, a joined portion 14a in an embodiment described later),
One of the plurality of coils is accommodated in the coil housing portion (for example, a temperature-sensitive joint 55 in an embodiment described later).

According to the invention of claim 1, a part of the coil and the temperature sensing part of the temperature detection element are covered with the cover member, and a part of the coil and the temperature sensing part of the temperature detection element are isolated from the surrounding space. Therefore, it is possible to suppress the temperature sensitive part from being affected by the temperature of the surrounding space or the cooling oil, and the temperature of the coil can be detected with higher accuracy in the temperature sensitive part.
Furthermore, since the partition is partitioned into a temperature detection element housing part, a coil housing part, and an insulating space located between the temperature detection element housing part and the coil housing part, an insulating material is provided around the temperature detection element. The coil and the temperature detecting element can be insulated without being filled, and the temperature detecting element can be easily attached and removed. Therefore, even when the temperature detecting element fails, only the temperature detecting element can be removed and replaced without removing the coil.

  According to the invention of claim 2, since the coil and / or the temperature detection element is positioned by contacting at least one of the coil and the end of the temperature detection element with the protrusion, the coil and / or the temperature detection element Thus, the temperature of the coil can be detected with higher accuracy in the temperature sensing portion.

  According to the invention of claim 3, the temperature detecting element can be more easily fixed and removed from the cover member.

  According to the invention of claim 4, the temperature detecting element can be more easily fixed and removed from the cover member.

  According to the invention of claim 5, the temperature of the coil can be detected with higher accuracy while protecting the joint of the joint portion by the cover member.

It is a longitudinal cross-sectional view of the electric motor provided with the stator of this invention. It is a perspective view which shows the state in which the stator of FIG. 1 was accommodated in the housing. It is a front view of the stator in FIG. It is a front view of a stator core. It is a perspective view of an insulator. (A) is a perspective view of the 1st coil by which the coil | winding was wound by the insulator, (b) is a perspective view of the 2nd coil by which the coil | winding was wound by the insulator. It is an expansion perspective view which shows the junction part of a coil winding. It is the elements on larger scale of FIG. It is sectional drawing of the thermistor vicinity in FIG. It is sectional drawing of the thermistor vicinity using the cover member which concerns on a modification. It is sectional drawing of the temperature sensor vicinity of patent document 1.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

  FIG. 1 is a longitudinal sectional view of an electric motor according to the present invention, and FIG. 2 is a perspective view showing a state in which the stator of FIG. 1 is accommodated in a housing. As shown in FIGS. 1 and 2, the electric motor according to the present embodiment is a three-phase, eight-pole pair outer rotation type electric motor 1, and a stator 10 fixed to a motor housing 2 with a bolt 3 around an axis O. And an annular rotor 6 disposed on the radially outer side of the stator 10 via a slight gap.

  The rotor 6 has a substantially annular shape in which a magnet 6b is embedded in a rotor core 6a formed by laminating electromagnetic steel plates. The rotor 6 is fixed to the edge inner peripheral surface 5a of the edged disk-shaped arm member 5, and can rotate integrally with a rotating shaft 8 rotatably supported by ball bearings 7 and 7 fitted in the motor housing 2. It is fixed to. The rotor 6 is driven to rotate by a rotating magnetic field generated in the stator 10. A resolver 9 that detects the magnetic pole position of the rotating shaft 8 is disposed between the rotating shaft 8 and the stator 10.

  As shown in FIGS. 3 and 4, the stator 10 includes a stator core 11 and a plurality (24 in the present embodiment) of coils 13 (13u, 13v, 13w). The stator core 11 is formed by laminating a plurality of electromagnetic steel plates in the axial direction of the stator 10, that is, in a direction perpendicular to the paper surface in FIG. 4, and is formed so as to protrude radially outward from the annular portion 11a in the circumferential direction. A plurality of (24) teeth 11b arranged in a row, and has a substantially annular shape as a whole. A plurality (six in this embodiment) of convex portions 11c each having a bolt hole 17 are formed on the inner peripheral side of the annular portion 11a of the stator core 11. The stator 10 is fixed to the motor housing 2 by the bolts 3 inserted into the bolt holes 17 (see FIGS. 1 and 2).

  The coil 13 is a winding made of a predetermined number of conducting wires (in this embodiment, a bundled wire (para-winding) made up of two conducting wires, hereinafter referred to as a bundled wire) 14 and a synthetic resin having insulating properties. It is formed by winding around each tooth 11b of the stator core 11 by salient pole concentrated winding via an insulator 12 formed by the above method.

  Each of the coils 13 includes eight U-phase, V-phase, and W-phase three-phase coils, and the U-phase coil 13u, the V-phase coil 13v, and the W-phase coil 13w are arranged in this order in the clockwise direction. It is wound around the teeth 11b. That is, the in-phase coils 13 (for example, the U-phase coil 13 u) disposed across the other-phase coils 13 (for example, the V-phase coil 13 v and the W-phase coil 13 w) straddle the other-phase coils 13. It is connected by the crossing part 14T routed.

  As shown in FIG. 5, the insulator 12 includes a barrel portion 24 around which the bundled wire 14 is wound, and an outer peripheral side flange portion 25 and an inner peripheral side flange portion 26 provided at both radial ends of the trunk portion 24. Have. The body portion 24 has a rectangular hole 24a penetrating in the radial direction by the walls 20 and 21 facing in the axial direction of the stator 10 and the walls 22 and 23 facing in the circumferential direction of the stator 10. It is formed in a cylindrical shape. The size of the square hole 24a is slightly larger than the teeth 11b of the stator core 11, and the teeth 11b can be inserted therethrough. A plurality of concave grooves 27 for positioning the bundle wire 14 when the bundle wire 14 is wound are provided in the walls 22 and 23 in a direction orthogonal to the axis of the square hole 24a.

  A pair of substantially U-shaped grooves 28 and 29 are formed at the end on the wall 20 side of the outer peripheral flange 25 so as to be spaced apart from each other in the circumferential direction. Moreover, the axial direction one end side part (wall 20 side) of the inner peripheral side collar part 26 is formed in thickness gradually from the circumferential direction intermediate part toward the circumferential direction both end surfaces seeing from the axial direction. Inner winding support portions 31 and 32 having a substantially triangular prism shape projecting toward one end side in the axial direction are provided at corners between both circumferential end surfaces and the radially outer side surface of the inner peripheral flange portion 26. In addition, inclined surfaces 33 and 34 that are inclined radially inward from the circumferential intermediate portion toward both circumferential end surfaces are formed on one axial end side portion of the inner circumferential flange 26. , 34 form groove portions 35, 36 facing the inclined surfaces 31 a, 32 a of the inner winding support portions 31, 32.

  Furthermore, at the boundary portion between the axial end portion of the inner peripheral side flange portion 26 and the wall 20, the peripheral end surface side (left end surface in FIG. 5) from the peripheral other end surface side (right end surface in FIG. 5). A guide portion 37 that is inclined with respect to the wall 20 and that guides the bundle wire 14 that is wound first along the wall 20 is formed. The guide portion 37 includes a groove portion 35 to a trunk portion 24. A stepped portion 37a is formed to guide the bundled wire 14 heading in the axial direction.

  The coil 13 is formed by winding the bundle wire 14 a plurality of times around the trunk portion 24 of the insulator 12. In the present embodiment, there are two types of coils 13 that are differently wound around the insulator 12. As shown in FIGS. 6 (a) and 6 (b), the coil 13 has a first winding end 41 of the coil 13 wound around the body 24 of the insulator 12 positioned on the outer side in the radial direction of the body 24. The second winding end 42 extends radially outward from the radially inner side of the body portion 24 across the coil 13 that is in a different phase. As shown in FIG. 6A, the first coil 13 has a first winding end 41 inserted in the groove 29 on the left side in the figure, and its end 41a slightly extends radially outward from the outer peripheral side flange 25. The length is set so as to protrude. Further, the first coil 13 passes through the groove 35 obliquely downward to the lower right so that the second winding end 42 is aligned with the inclined surface 33 in the axial direction, and is locked to the inner winding support 31. As shown in FIG. 3, the tip of the inner winding support 31 extends outward in the radial direction, and its end 42a is a groove 29 in the end 41a of the first winding end 41 of the in-phase coil 13 adjacent in the circumferential direction. Therefore, the length is set so that the end portion 42a slightly protrudes radially outward from the outer peripheral side flange portion 25 in addition to the crossing portion 14T straddling the coil 13 which is a different phase. The

  As shown in FIG. 6B, the second coil 13 has a first winding end 41 inserted into the groove 28 on the right side in the figure, and its end 41a is radially outward from the outer peripheral flange 25. The length is set so as to protrude slightly. Further, the second coil 13 extends the groove 36 obliquely to the lower left so that the second winding end 42 is wound around the inner winding support portion 32 and aligned with the inclined surface 34 in the axial direction. As shown in FIG. 3, the tip of the inner winding support 32 extends outward in the radial direction and the end portion 42a of the first winding end 41 of the in-phase coil 13 adjacent in the circumferential direction has a groove 28 in the end portion 41a. Therefore, the length is set so that the end portion 42a slightly protrudes radially outward from the outer peripheral side flange portion 25 in addition to the crossing portion 14T straddling the coil 13 which is a different phase. The

  Returning to FIG. 3, each of the eight coils 13 (U-phase, V-phase, and W-phase coils 13u, 13v, 13w) corresponding to the half circumference of the stator core 11 is divided into two coil groups 18 ( 18u, 18v, 18w). That is, the coil 13 of the coil group 18 (a coil group located on the left side of the boundary line P in FIG. 3) formed in the counterclockwise direction with respect to the stator 10 is composed of the first coil 13. On the other hand, the coil 13 of the coil group 18 (coil group positioned on the right side of the boundary line P in FIG. 3) formed clockwise is composed of the second coil 13.

  However, in the embodiment shown in FIG. 3, among the second coils 13 of the coil group 18 formed clockwise with respect to the stator 10, three coils 13 (13 u) connected to a neutral point to be described later. 13v, 13w), the first winding end 41 is inserted into the groove 29 and its end 41a is led upward to facilitate connection with the neutral point. Temporarily, these three coils 13 are called the 3rd coil 13. FIG. Note that all the coils 13 of the coil group 18 formed clockwise with respect to the stator 10 may be constituted by the second coils 13. In this case, the connection with the neutral point is slightly different.

  In FIG. 3, in the upper part of the figure, the bundle wire 14 derived from the pair of coils 13 in phase arranged closest to both sides of the boundary line P, specifically, formed counterclockwise with respect to the stator 10. Second winding ends 42 of the first U-phase coil 13u of the U-phase coil group 18u and the second U-phase coil 13u of the U-phase coil group 18u formed clockwise with respect to the stator 10. Is connected to the U-phase connection terminal 15u.

  Similarly, in the upper part of the figure, the ends 42a of the second winding ends 42 of the pair of V-phase coils 13v arranged closest to both sides of the boundary line P are connected to the V-phase connection terminal 15v, and a pair of W An end 42a of the second winding end 42 of the phase coil 13w is connected to the W-phase connection terminal 15w.

  Further, the position where the coil group 18 formed in the counterclockwise direction and the coil group 18 formed in the clockwise direction meet, that is, the connection terminals 15 of each phase (U-phase, V-phase and W-phase connection terminals 15u, 15v). , 15w), the ends 41a of the first winding ends 41 of each phase pair and the six coils 13 arranged on both sides with the boundary line P interposed therebetween are the ends 41a of the adjacent coils 13. These are connected by connection lines 40 to form a neutral point.

  Further, the second winding end 42 of each first coil 13 of the coil group 18 formed around the left direction is inserted into the groove portion 36 of the adjacent coil 13 through the groove portion 35 of the insulator 12 and locked. The end portion 42a is joined to the end portion 41a of the first winding end 41 extending outward in the radial direction of the outer peripheral side flange portion 25 of the in-phase coil adjacent in the circumferential direction.

  Similarly, in the coil 13 of the coil group 18 formed in the clockwise direction, the second winding end 42 of each second coil 13 is inserted into the groove portion 35 of the adjacent coil 13 through the groove portion 36 of the insulator 12. Thus, the end 42a is joined to the end 41a of the first winding end 41 extending outward in the radial direction of the outer peripheral side flange 25 of the in-phase coil adjacent in the circumferential direction. Referring also to FIG. 7, the joint portion 14 a between the end portion 41 a of the first winding end 41 and the end portion 42 a of the second winding end 42 is a joint portion of the remaining coil 13 excluding the joint portion 14 a of one coil 13. 14 a is covered with an insulating cap 50.

  Here, the joint part 14a of one coil 13 among the plurality of coils 13 is disposed in the vicinity of the temperature sensing part 71 of the thermistor 70 as a temperature detection element. In the following description, the joint portion 14a of the coil 13 disposed in the vicinity of the temperature sensing portion 71 of the thermistor 70 is referred to as a temperature sensing joint portion 55.

  As shown in FIG. 9, the temperature-sensitive junction 55 and the temperature-sensitive portion 71 of the thermistor 70 are covered with a cover member 80, and the temperature-sensitive junction 55 and the temperature-sensitive portion 71 of the thermistor 70 are surrounded by the surroundings. Isolated from space. Therefore, a decrease in temperature detection accuracy due to the influence of cooling oil or the like is prevented.

  The cover member 80 is an insulative cylindrical member made of an insulating material such as rubber, for example, and one end in the longitudinal direction forms the thermistor housing 81 and the other end in the longitudinal direction houses the temperature-sensitive joint 55. 82. That is, the thermistor insertion hole 81a of the thermistor accommodating portion 81 is formed at one end in the longitudinal direction, and the coil insertion hole 82a of the coil accommodating portion 82 is formed at the other end in the longitudinal direction. In addition, the cover member 80 is formed with one protruding portion 84 that protrudes inward from the inner peripheral wall 83 at a substantially central portion in the longitudinal direction. A communication hole 85 is formed at a substantially central portion of the protruding portion 84, and the thermistor housing portion 81 and the coil housing portion 82 communicate with each other via the communication hole 85. Further, one end in the longitudinal direction of the protruding portion 84 forms a horizontal plane orthogonal to the central axis of the cover member 80, and the other end in the longitudinal direction forms a curved surface that gradually increases in diameter as the distance from the communication hole 85 increases. Therefore, the lower end of the thermistor 70 accommodated in the thermistor accommodating part 81 is positioned on a horizontal plane, and the temperature-sensitive joint 55 accommodated in the coil accommodating part 82 is restricted from moving toward the one end side from the curved surface. As a result, an insulating space 86 is secured between the thermistor accommodating portion 81 and the thermistor accommodating portion 81. That is, the inside of the cover member 80 is partitioned into a thermistor accommodating portion 81, a coil accommodating portion 82, and an insulating space 86 by the protruding portion 84.

  The temperature-sensitive joining portion 55 is accommodated in the coil accommodating portion 82 of the cover member 80 configured as described above. At this time, the temperature-sensitive joint 55 is fixed to the cover member 80 by an adhesive, and the insulating space 86 becomes an adhesive reservoir. The amount of the adhesive is set so as not to flow out to the thermistor accommodating portion 81 beyond the communication hole 85. On the other end side in the longitudinal direction of the cover member 80, a plurality of step portions 87 are formed in order to increase the contact area between the adhesive and the cover member 80. It should be noted that this step portion 87 makes it possible to distinguish one end side and the other end side of the cover member 80 in appearance.

  On the other hand, the temperature sensitive part 71 of the thermistor 70 is accommodated in the thermistor accommodating part 81 of the cover member 80. At this time, the temperature sensing portion 71 of the thermistor 70 is elastically fixed by the elastic force of the cover member 80 without using an adhesive. Therefore, for example, when the thermistor 70 is replaced due to a failure of the thermistor 70, only the thermistor 70 can be removed from the cover member 80 and replaced.

  The shape of the cover member 80 is not particularly limited as long as it is partitioned into the thermistor housing portion 81, the coil housing portion 82, and the insulating space 86. For example, as shown in FIG. 10, two projecting portions 84 a and 84 b projecting inward from the inner peripheral wall 83 may be formed at a substantially central portion in the longitudinal direction. Communication holes 85a and 85b are formed substantially at the center of the projecting portions 84a and 84b, and the thermistor housing portion 81 and the thermistor housing portion 81 communicate with each other through the communication holes 85a and 85b. Further, both longitudinal ends of the projecting portions 84a and 84b form a horizontal plane orthogonal to the central axis of the cover member 80, and the lower end of the thermistor 70 accommodated in the thermistor accommodating portion 81 is positioned on the horizontal plane, and the coil The upper end of the temperature-sensitive joining portion 55 accommodated in the accommodating portion 82 is also positioned in the horizontal plane. As a result, an insulating space 86 is secured between the two protruding portions 84 a and 84 b between the thermistor housing portion 81 and the thermistor housing portion 81.

  Next, the manufacturing procedure of the stator 10 will be described. First, the bundled wire 14 is wound around each of the 24 insulators 12 to create independent coils 13. Among the 24 coils 13, 12 coils 13 formed counterclockwise with respect to the stator 10 are wound in the above-described manner of winding the first coil 13, and clockwise with respect to the stator 10. Among the formed coils, nine coils 13 are wound by the winding method of the second coil 13, and the three coils 13 connected to the neutral point are bundled wires 14 extending from the first winding end 41. The end 41a is wound in the manner of winding the third coil 13 inserted through the groove 29.

  Next, the twelve insulators 12 around which the first coil 13 is wound are sequentially mounted counterclockwise on the teeth 11b on the left side of the assumed boundary line P (see FIG. 3) on the stator core 11. Then, nine insulators 12 around which the second coil 13 is wound are sequentially mounted clockwise on the teeth 11b on the right side of the boundary line P assumed on the stator core 11, and further, the third coil 13 is mounted. The remaining three wound insulators 12 are sequentially attached clockwise after the second coil 13. Since each coil 13 is wound around the insulator 12 independently of each other, the coil 13 can be easily inserted into the teeth 11b and has high productivity.

  Subsequently, the crossing portion 14T is routed while being formed. Specifically, referring to FIG. 3, the second winding end 42 of the first coil 13 formed counterclockwise with respect to the stator 10 is inserted into the groove 36 of the adjacent insulator 12 and molded. Further, the end 42a is inserted into the groove 29 on the left side of the insulator 12 of the in-phase coil adjacent in the circumferential direction. Thereby, the crossover part 14T is shape | molded. In addition, the end portion 41 a of the first winding end 41 of one coil 13 of the in-phase coil (for example, the U-phase coil 13 u) and the end portion 42 a of the second winding end 42 of the other coil 13 are in the groove 29. Aligned.

  Similarly, the second winding end 42 of the second coil 13 formed in the clockwise direction with respect to the stator 10 is inserted into the groove portion 35 of the adjacent coil 13 and molded, and the end portion 42a is circumferentially formed. Is inserted into the groove 28 on the right side of the insulator 12 of the in-phase coil adjacent to. Thereby, the crossover part 14T is shape | molded. Further, the end portion 41 a of the first winding end 41 of one coil 13 of the in-phase coil (for example, the U-phase coil 13 u) and the end portion 42 a of the second winding end 42 of the other coil 13 are in the groove 28. Aligned.

  Further, six coils 13 arranged on the opposite side of the connection terminals 15 of each phase, that is, the first winding ends 41 of the three first and third coils 13 each connected to the neutral point. The connecting wire 40 formed in a substantially U-shape is disposed between the end portions 41a of the adjacent coils 13 so as to connect the end portions 41a to each other.

  Next, the ends 41 a and 42 a of the bundled wires 14 aligned in the grooves 28 and 29 and the connection wires 40 are joined by applying ultrasonic waves using, for example, an ultrasonic welding apparatus. In addition, the insulating film of the part to which the bundled wire 14 is welded is peeled off before joining.

  Then, the stator 10 is fixed to the housing 2 with bolts 3. Further, the connection terminals 15 (15u, 15v, 15w) of the respective phases are connected to the end portions 42a of the second winding ends 42 of the pair of coils 13 of the same phase that are arranged closest to both sides of the boundary line P (see FIG. 3). ).

  Next, the joint 14 a of the remaining coil 13 other than the coil 13 disposed in the vicinity of the thermistor 70 is covered with an insulating cap 50. Then, an adhesive is applied to the joint portion 14 a of the coil 13 disposed in the vicinity of the thermistor 70, that is, the temperature-sensitive joint portion 55, and is accommodated in the coil accommodating portion 82 of the cover member 80, and the cover member 80 is attached. . Subsequently, the temperature sensing part 71 of the thermistor 70 is attached to the thermistor housing part 81 of the cover member 80. At this time, the thermistor 70 is supported by the clip 52 on the stay 51 fixed to the housing 2 with the bolt 3.

  As described above, according to the salient pole concentrated winding stator 10 of the electric motor of the present embodiment, the temperature-sensitive junction 55 and the temperature-sensitive portion 71 of the thermistor 70 that are part of the coil are covered with the cover member 80. Since the temperature sensing joint 55 and the temperature sensing portion 71 of the thermistor 70 are isolated from the surrounding space, the temperature sensing portion 71 can be suppressed from being affected by the temperature of the surrounding space or the cooling oil. The temperature of the coil can be detected with higher accuracy in the temperature unit 71.

  Further, the thermistor 70 is partitioned by the protrusions 84, 84 a, 84 b into the thermistor housing 81, the coil housing 82, and the insulating space 86 positioned between the thermistor housing 81 and the coil housing 82. The coil 13 and the thermistor 70 can be insulated from each other without filling the periphery with an insulating material, and the thermistor 70 can be easily attached and detached. Therefore, even when the thermistor 70 fails, only the thermistor 70 can be removed and replaced without removing the coil 13.

  According to the present embodiment, since at least one of the coil 13 and the end of the thermistor 70 comes into contact with the protrusions 84, 84a, 84b, the coil 13 and / or the thermistor 70 is positioned. And / or the dispersion | variation in the position of the thermistor 70 can be suppressed, and the temperature of the coil 13 can be detected more accurately in the temperature sensing part 71.

  Further, according to the present embodiment, the cover member 80 includes the coil insertion hole 82a into which the temperature-sensitive joint 55 is inserted and the thermistor insertion hole 81a into which the thermistor 70 is inserted separately, so that the thermistor housing part The position of 81 and the direction in which the thermistor 70 is inserted into the cover member 80 can be arbitrarily set according to the arrangement of the components constituting the stator 10, and the thermistor 70 can be more easily fixed and removed from the cover member 80. . A thermistor insertion hole 81a and a coil insertion hole 82a may be formed on the same side of the cover member 80. The thermistor insertion hole 81a and the coil insertion hole 82a are formed as one hole, and the thermistor accommodating portion 81 and the coil are accommodated therein. It may be divided into part 82.

  Further, according to the present embodiment, the thermistor 70 is elastically fixed to the cover member 80, so that the thermistor 70 can be fixed and removed from the cover member 80 more easily.

  Further, according to the present embodiment, since the temperature sensitive joint 55 is accommodated in the coil accommodating portion 82, the temperature of the coil 13 can be more accurately detected while protecting the junction of the temperature sensitive joint 55 by the cover member 80. Can be detected. Further, since the cover member 80 is made of an insulating material, the temperature-sensitive joint 55 can be insulated from the surrounding space.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In the above description, the salient pole concentrated winding stator of the external rotation type motor has been described. However, the present invention is not limited to this, and a plurality of teeth are formed to protrude radially inward from the annular portion of the stator core. The present invention can be similarly applied to other types of stators such as a stator of an internal rotation type motor and a stator having a split core. Further, insulating paper or the like may be interposed instead of the insulator 12.

1 Electric motor 10 Stator (salient pole concentrated winding stator)
11 Stator core 11b Teeth 12 Insulator 13 Coil 14 Bundled wire (winding)
14a Joining portion 41 First winding end 41a End portion 42 Second winding end 42a End portion 55 Temperature-sensitive joining portion 70 Thermistor (temperature detection element)
71 Temperature sensing part 80 Cover member 81 Thermistor accommodating part 81a Thermistor insertion hole 82 Coil accommodating part 82a Coil insertion holes 84, 84a, 84b Protruding part (partition part)
86 Insulation space

Claims (5)

A stator core;
A coil wound around the stator core, and a stator of an electric motor,
The stator includes a temperature detection element having a temperature sensing part that detects the temperature of the coil, and a cover member that covers a part of the coil and the temperature sensing part,
The inside of the cover member is divided into a temperature detection element storage part in which the temperature detection element is stored, a coil storage part in which a part of the coil is stored, the temperature detection element storage part, and the coil storage. A stator for an electric motor, wherein the stator is partitioned into an insulating space located between the first and second portions. The partition part is a protruding part protruding inside the cover member,
The stator of the electric motor according to claim 1, wherein at least one of a part of the coil and an end of the temperature detection element is in contact with the protrusion.   The said cover member is separately provided with the coil insertion hole in which a part of said coil is inserted, and the temperature detection element insertion hole in which the said temperature detection element is inserted, The Claim 1 or 2 characterized by the above-mentioned. The stator of the electric motor.   The stator of an electric motor according to any one of claims 1 to 3, wherein the temperature detection element is elastically fixed to the cover member. The stator core has a plurality of teeth that are arranged at predetermined intervals in the circumferential direction and project radially.
The coil is composed of a plurality of coils wound around the teeth with salient pole concentrated winding so as to be different from each other in the teeth adjacent in the circumferential direction,
Each of the plurality of coils has a first winding end and a second winding end located on one axial end side of the stator,
Extending at least one of the first winding end and the second winding end in a circumferential direction across a coil having a different phase;
The end portion of one of the first winding ends of the in-phase coils adjacent in the circumferential direction and the end portion of the other second winding end are joined to form a joint portion,
The stator for an electric motor according to any one of claims 1 to 4, wherein the joint portion of one of the plurality of coils is accommodated in the coil accommodating portion.

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