Electric work machine

Abstract

To provide an electrically-driven work machine having a temperature detection unit that detects the temperature of a stator.SOLUTION: An electrically-driven work machine includes: a motor having a stator 22A and a rotor that rotates around a rotation shaft with respect to the stator; an output section driven by the rotor; and a temperature detection unit 100A disposed on the stator. The stator has: a stator core 33 including a yoke and teeth protruding in a radial direction from the yoke; an insulator 34 having a teeth-covering portion that covers at least part of the surface of the teeth and fixed to the stator core; and a coil wound around the teeth via the teeth covering portion. The temperature detection unit is disposed in a recess 56 provided on the insulator. The motor is air cooled by a fan.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The technology disclosed in this specification relates to an electric work machine. [Background technology]

[0002] In the technical field related to electric working machines, there is known an electric working machine equipped with a brushless motor having a stator and a rotor. Patent Document 1 discloses an example of a brushless motor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-180165 Summary of the Invention [Problem to be solved by the invention]

[0004] In some cases, a temperature detection element is disposed in the stator to detect the temperature of the stator. When a temperature detection element is disposed in the stator, there is a demand for a technology that can suppress an increase in the cost of the electric work machine.

[0005] The technology disclosed in this specification aims to reduce the cost of an electric operating machine having a temperature detection element that detects the temperature of a stator. [Means for solving the problem]

[0006] This specification discloses an electric working machine. The electric working machine may include a motor, an output unit, and a temperature detection element. The motor may have a stator and a rotor that rotates about a rotation axis relative to the stator. The output unit may be driven by the rotor. The temperature detection element may be disposed in the stator. The stator may have a stator core, an insulator, and a coil. The stator core may include a yoke and teeth that protrude radially from the yoke. The insulator may have a tooth covering portion that covers at least a portion of the surface of the teeth and be fixed to the stator core. The coil may be wound around the teeth via the tooth covering portion. The temperature detection element may be disposed in a recess provided in the insulator. [Effects of the Invention]

[0007] According to the technology disclosed in this specification, the cost of an electric operating machine having a temperature detection element that detects the temperature of a stator can be reduced. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view from the front showing an electric operating machine according to a first embodiment. [Figure 2] FIG. 2 is an exploded perspective view of the motor according to the first embodiment, as viewed from the front. [Figure 3] FIG. 3 is a perspective view of the stator and the sensor unit according to the first embodiment, as viewed from the front. [Figure 4] FIG. 4 is an exploded perspective view from the front showing the stator and the sensor unit according to the first embodiment. [Figure 5] FIG. 5 is a perspective view from the front showing the stator core, the insulators, and the coils according to the first embodiment. [Figure 6] FIG. 6 is a perspective view showing the stator core and the insulator according to the first embodiment, as viewed from the front. [Figure 7] FIG. 7 is an exploded perspective view of the busbar unit according to the first embodiment, as viewed from the front. [Figure 8]FIG. 8 is an exploded perspective view showing the sensor unit according to the first embodiment, as seen from the rear. [Figure 9] FIG. 9 is an exploded perspective view seen from the front showing the stator core, the insulator, and the temperature detection unit according to the first embodiment. [Figure 10] FIG. 10 is an exploded perspective view of the temperature detection unit according to the first embodiment, as viewed from the front. [Figure 11] FIG. 11 is an exploded perspective view showing the temperature detection unit according to the first embodiment, as seen from the rear. [Figure 12] FIG. 12 is a perspective view showing a temperature detection unit disposed in the insulator according to the first embodiment. [Figure 13] FIG. 13 is a cross-sectional view showing a temperature detection unit disposed in the insulator according to the first embodiment. [Figure 14] FIG. 14 is a perspective view showing the stator core, the insulator, and the temperature detection unit according to the second embodiment, as viewed from the front. [Figure 15] FIG. 15 is an exploded perspective view seen from the front showing a stator core, an insulator, and a temperature detection unit according to the second embodiment. [Figure 16] FIG. 16 is an exploded perspective view of the temperature detection unit according to the second embodiment, as viewed from the front. [Figure 17] FIG. 17 is an exploded perspective view showing the temperature detection unit according to the second embodiment, as seen from the rear. [Figure 18] FIG. 18 is a perspective view showing a temperature detection unit disposed in an insulator according to the second embodiment. [Figure 19] FIG. 19 is a cross-sectional view showing a temperature detection unit disposed in an insulator according to the second embodiment. [Figure 20] FIG. 20 is a perspective view showing the stator core, the insulator, and the temperature detection unit according to the third embodiment, as viewed from the front. [Figure 21] FIG. 21 is an exploded perspective view seen from the front showing a stator core, an insulator, and a temperature detection unit according to the third embodiment. [Figure 22] FIG. 22 is an exploded perspective view of the temperature detection unit according to the third embodiment, as viewed from the front. [Figure 23] FIG. 23 is an exploded perspective view showing the temperature detection unit according to the third embodiment, as seen from the rear. [Figure 24] FIG. 24 is a perspective view showing a temperature detection unit disposed in an insulator according to the third embodiment. [Figure 25] FIG. 25 is a cross-sectional view showing a temperature detection unit disposed in an insulator according to the third embodiment. [Figure 26] FIG. 26 is a perspective view showing a stator according to the fourth embodiment, as viewed from the front. [Figure 27] FIG. 27 is an exploded perspective view showing the stator according to the fourth embodiment, as viewed from the front. [Figure 28] FIG. 28 is a perspective view showing the stator core, insulators, and coils according to the fourth embodiment, as viewed from the front. [Figure 29] FIG. 29 is a perspective view showing the stator core and the insulator according to the fourth embodiment, as viewed from the front. [Figure 30] FIG. 30 is an exploded perspective view showing the stator core, the insulator, and the cover according to the fourth embodiment, as viewed from the front. [Figure 31] FIG. 31 is a diagram showing a temperature detection element and a wiring pattern according to the fourth embodiment. [Figure 32] FIG. 32 is a diagram showing a temperature detection unit according to the fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] In one or more embodiments, the electric operating machine may include a motor, an output unit, and a temperature detection element. The motor may have a stator and a rotor that rotates about a rotation axis relative to the stator. The output unit may be driven by the rotor. The temperature detection element may be disposed in the stator. The stator may have a stator core, an insulator, and a coil. The stator core may include a yoke and teeth that protrude radially from the yoke. The insulator may have a tooth covering portion that covers at least a portion of the surface of the teeth and be fixed to the stator core. The coil may be wound around the teeth via the tooth covering portion. The temperature detection element may be disposed in a recess provided in the insulator.

[0010] In the above configuration, the temperature detection element is disposed in the recess of the insulator, so the stator in which the temperature detection element is disposed can be constructed inexpensively. Furthermore, the temperature detection element can accurately detect the temperature of the stator.

[0011] In one or more embodiments, the recess may be axially disposed between the tooth and the coil.

[0012] In the above configuration, the temperature detection element is disposed between the teeth and the coil in the axial direction, thereby reducing the axial size of the stator.

[0013] In one or more embodiments, at least a portion of the recess may be located between the tooth and the coil.

[0014] In the above configuration, the temperature detection element is disposed between the teeth and the coil. Therefore, the temperature of the coil can be properly detected by the temperature detection element. The motor is air-cooled by a fan. Cooling air is supplied to the surface of the coil. The temperature of the coil surface is likely to fluctuate due to the cooling air. Therefore, if the temperature detection element is disposed on the surface of the coil, the detection signal of the temperature detection element may become unstable. Since cooling air is not directly supplied between the coil and the teeth, disposing the temperature detection element between the coil and the teeth stabilizes the detection signal of the temperature detection element. Therefore, the temperature of the coil can be properly detected by the temperature detection element.

[0015] In one or more embodiments, the electric operating machine may include a support member that supports the temperature detection element. The support member may be disposed in the recess.

[0016] In the above configuration, when forming a wiring pattern connected to the temperature detection element by the MID method, for example, the wiring pattern can be formed on the support member. That is, instead of forming the wiring pattern on the insulator by the MID method, the manufacturing cost of the wiring pattern can be reduced by forming the wiring pattern on the support member that is detachable from the insulator by the MID method.

[0017] In one or more embodiments, the recesses may include first recesses provided at axial ends of the teeth. The support member may have first support portions disposed in the first recesses. The temperature sensing element may be supported by the first support portions.

[0018] In the above configuration, the temperature detection element is disposed on the tooth around which the coil is wound, allowing the temperature of the coil to be properly detected. The motor is air-cooled by a fan. Cooling air is supplied to the surface of the coil. The temperature of the coil surface is likely to fluctuate due to the cooling air. Therefore, if the temperature detection element is disposed on the surface of the coil, the detection signal of the temperature detection element may become unstable. Since cooling air is not directly supplied between the coil and the tooth, disposing the temperature detection element between the coil and the tooth stabilizes the detection signal of the temperature detection element. Therefore, the temperature of the coil is properly detected by the temperature detection element. Furthermore, since the first recess is disposed at the axial end of the tooth, a decrease in workability when placing the first support part in the first recess is suppressed.

[0019] In one or more embodiments, the first support may be disposed between the tooth and the coil, and the temperature sensing element may be disposed between the first support and the coil.

[0020] In the above configuration, the temperature detection element is disposed at a position closer to the coil than the first support part, and therefore the temperature of the coil can be detected appropriately.

[0021] In one or more embodiments, the first support portion may be disposed on an end surface on one axial side of the tooth, and the temperature detection element may be disposed on a surface of the first support portion on one axial side.

[0022] In the above configuration, when one axial side is considered to be the front side or forward, the first support is disposed on the front end surface of the tooth, and the temperature detection element is disposed in front of the first support, so that the temperature detection element and the first support are properly positioned with respect to the coil.

[0023] In one or more embodiments, the first support portion may have a plate portion and a peripheral wall portion disposed on a peripheral edge of a surface of the plate portion on one axial side. The temperature detection element may be disposed on the surface of the plate portion on one axial side.

[0024] In the above configuration, if one axial side is considered to be the front side or forward, a peripheral wall is provided on the peripheral edge of the front surface of the plate, and the temperature detection element is disposed on the front surface of the plate. By surrounding the temperature detection element with the peripheral wall, the coil is prevented from hitting the peripheral wall, which prevents direct contact between the coil and the temperature detection element, for example. Therefore, the temperature detection element is protected from the coil.

[0025] In one or more embodiments, a wiring pattern may be provided that is connected to the temperature detection element, and the wiring pattern may be disposed on a surface of the support member on one axial side.

[0026] In the above configuration, if one axial side is considered the front side or forward, the wiring pattern is disposed on the front surface of the support member. This allows the temperature detection element, wiring pattern, and signal line to be properly connected in the support member. Furthermore, by forming the wiring pattern on the support member using the MID method, the manufacturing cost of the wiring pattern is reduced.

[0027] In one or more embodiments, the first support may be disposed between the teeth and the coil, and the temperature sensing element may be disposed between the first support and the teeth.

[0028] In the above configuration, the temperature detection element is disposed at a position farther from the coil than the first support portion, and therefore the temperature detection element is protected from the coil.

[0029] In one or more embodiments, the first support portion may be disposed on an end surface of the tooth on one axial side, and the temperature detection element may be disposed on a surface of the first support portion on the other axial side.

[0030] In the above configuration, when one axial side is considered to be the front side or forward and the other axial side is considered to be the rear side or rear, the first support is disposed on the front end surface of the tooth and the temperature detection element is disposed on the rear surface of the first support, thereby ensuring that the temperature detection element and the first support are properly positioned relative to the coil.

[0031] In one or more embodiments, the first support portion may have a plate portion and a peripheral wall portion disposed on a peripheral edge of a surface of the plate portion on the other axial side. The temperature detection element may be disposed on the surface of the plate portion on the other axial side.

[0032] In the above configuration, if the other axial side is considered to be the rear side or rear, a peripheral wall is provided on the peripheral edge of the rear surface of the plate, and the temperature detection element is disposed on the rear surface of the plate. By surrounding the temperature detection element with the peripheral wall, the teeth are prevented from hitting the peripheral wall, preventing direct contact between the teeth and the temperature detection element, for example. Therefore, the temperature detection element is protected from the teeth.

[0033] In one or more embodiments, a wiring pattern connected to the temperature detection element may be provided, with a portion of the wiring pattern being disposed on the surface of the support member on the other axial side, and a portion of the wiring pattern being disposed on the surface of the support member on the one axial side.

[0034] In the above configuration, if one axial side is considered the front side or forward and the other axial side is considered the rear side or rear, a portion of the wiring pattern is disposed on the rear surface of the support member, and a portion of the wiring pattern is disposed on the front surface of the support member. This ensures that the temperature detection element, wiring pattern, and signal line are properly connected in the support member. Furthermore, by forming the wiring pattern on the support member using the MID method, manufacturing costs for the wiring pattern are reduced.

[0035] In one or more embodiments, the support member may have a through hole that penetrates through a surface of the support member on the other axial side and a surface of the support member on one axial side. A portion of the wiring pattern disposed on the surface of the support member on the other axial side may be connected to a portion of the wiring pattern disposed on the surface of the support member on the one axial side via the through hole.

[0036] In the above configuration, by providing a through hole in the support member, when one axial side is regarded as the front side or forward and the other axial side is regarded as the rear side or rear, the wiring pattern arranged on the rear surface of the support member and the wiring pattern arranged on the front surface of the support member are connected via the through hole.

[0037] In one or more embodiments, the recess may include a second recess disposed radially outward of the first recess and connected to the first recess. The support member may have a second support portion disposed in the second recess. A dimension of the second support portion in the circumferential direction may be greater than a dimension of the first support portion.

[0038] In the above configuration, since the dimensions of the second support portion are larger than the dimensions of the first support portion, connecting the wiring pattern and the signal line at the second support portion prevents a decrease in workability when connecting the wiring pattern and the signal line. Furthermore, a step is formed at the boundary between the first recess and the second recess, and a step is formed at the boundary between the first support portion and the second support portion, making it possible to easily position the recess and the support member. The first support portion and the second support portion may be formed as a single member or as separate members.

[0039] In one or more embodiments, the second recess may be provided at an axial end of the yoke.

[0040] In the above configuration, the second support portion is disposed on the yoke, and therefore, deterioration in workability when disposing the support member in the recess is suppressed.

[0041] In one or more embodiments, a cover may be provided that covers the temperature sensing element supported on the support member.

[0042] In the above configuration, the cover protects the temperature detection element. For example, if the temperature detection element faces the coil, the cover protects the temperature detection element from the coil. For example, if the temperature detection element faces the teeth, the cover protects the temperature detection element from the teeth.

[0043] In one or more embodiments, the electric operating machine may include a motor, an output unit, a temperature detection element, and a cover. The motor may have a stator and a rotor that rotates about a rotation axis relative to the stator. The output unit may be driven by the rotor. The temperature detection element may be disposed on the stator. The cover may cover the temperature detection element. The stator may have a stator core, an insulator, and a coil. The stator core may include a yoke and teeth that protrude radially from the yoke. The insulator may have tooth covering portions that cover at least a portion of the surface of the teeth and be fixed to the stator core. The coil may be wound around the teeth via the cover and the tooth covering portion.

[0044] In the above configuration, the coil is wound around the teeth via the cover that covers the temperature detection element and the tooth covering portion, so the stator in which the temperature detection element is disposed can be constructed inexpensively.

[0045] In one or more embodiments, the electric operating machine may include a motor, an output unit, a temperature detection element, a wiring pattern, a power line, a power line holder, and a screw. The motor may include a stator and a rotor that rotates about a rotation axis relative to the stator. The output unit may be driven by the rotor. The stator may include a stator core having teeth, an insulator fixed to the stator core, and a coil wound around the teeth via the insulator. The temperature detection element may be disposed on the stator. The wiring pattern may be connected to the temperature detection element. The power line may supply a drive current to the coil. The power line holder may hold the power line and a signal line. The screw may secure the signal line to the insulator. At least a portion of the wiring pattern may be disposed in the insulator. The screw may secure the signal line to the insulator with the signal line in contact with the wiring pattern.

[0046] In the above configuration, the signal line and the wiring pattern are connected by screws, so that the stator in which the temperature detection element is disposed can be constructed inexpensively.

[0047] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings, but the present disclosure is not limited to the embodiments. The components of the embodiments described below can be combined as appropriate. In addition, some components may not be used.

[0048] In the embodiment, the positional relationship of each part will be described using the terms "left," "right," "front," "rear," "upper," and "lower." These terms indicate relative positions or directions based on the center of the electric operating machine 1.

[0049] The electric work machine 1 has a motor 6. A rotor 23 of the motor 6 rotates around a rotation axis AX. In the embodiments, the radial direction of the rotation axis AX is referred to as the radial direction, the direction circumferentially around the rotation axis AX is referred to as the circumferential direction or the rotation direction, and the direction parallel to the rotation axis AX is referred to as the axial direction.

[0050] In the radial direction, a position or direction closer to the rotation axis AX will be referred to as the radially inner side, and a position or direction farther from the rotation axis AX will be referred to as the radially outer side. A position or direction on one side in the circumferential direction will be referred to as the one circumferential side, and a position or direction on the other side in the circumferential direction will be referred to as the other circumferential side. A position or direction on one side in the axial direction will be referred to as the one axial side, and a position or direction on the other axial side will be referred to as the other axial side.

[0051] In this embodiment, the rotation axis AX extends in the front-to-rear direction. The axial direction and the front-to-rear direction are parallel. One side in the axial direction is referred to as the front side or forward. The other side in the axial direction is referred to as the rear side or rear.

[0052] [First embodiment] <Electric working equipment> 1 is a front perspective view of an electric work machine 1 according to this embodiment. In this embodiment, the electric work machine 1 is an impact driver, which is a type of power tool. As shown in FIG. 1, the electric work machine 1 includes a housing 2, a rear case 3, a hammer case 4, a battery mounting section 5, a motor 6, a fan 7, an anvil 8, a controller 9, a trigger switch 10, a forward / reverse rotation switch lever 11, an operation panel 12, and a light 13.

[0053] The housing 2 has a motor accommodating portion 14, a grip portion 15, and a battery connecting portion 16. The housing 2 is made of synthetic resin.

[0054] The motor accommodating portion 14 accommodates the motor 6. The motor accommodating portion 14 is cylindrical.

[0055] The grip portion 15 is held by an operator using the electric work machine 1. The grip portion 15 protrudes downward from the lower portion of the motor housing portion .

[0056] The battery connector 16 houses the controller 9. The battery connector 16 is connected to the lower end of the grip 15. The external dimensions of the battery connector 16 are larger than the external dimensions of the grip 15 in both the front-rear and left-right directions.

[0057] The rear case 3 is connected to the rear of the motor housing portion 14 so as to cover the opening at the rear of the motor housing portion 14. The rear case 3 is made of synthetic resin.

[0058] The hammer case 4 is connected to the front of the motor housing portion 14 so as to cover the opening in the front of the motor housing portion 14. The hammer case 4 is made of metal.

[0059] A battery pack 17 is attached to the battery attachment section 5. The battery pack 17 functions as a power source for the electric work machine 1. The battery attachment section 5 is provided below the battery connect section 16. The battery pack 17 is detachable from the battery attachment section 5. The battery pack 17 includes a secondary battery. In this embodiment, the battery pack 17 includes a rechargeable lithium-ion battery. When attached to the battery attachment section 5, the battery pack 17 can supply power to the electric work machine 1. The motor 6 is driven based on the power supplied from the battery pack 17. The controller 9 operates based on the power supplied from the battery pack 17.

[0060] The motor 6 is a power source for the electric work machine 1. The motor 6 generates a rotational force for rotating the anvil 8. The motor 6 is a brushless motor. The rotation axis AX of the motor 6 extends in the front-rear direction. The axial direction and the front-rear direction are parallel to each other.

[0061] The fan 7 generates an airflow for cooling the motor 6. The fan 7 rotates due to the rotational force generated by the motor 6.

[0062] The motor accommodating section 14 has an intake port 18. The rear case 3 has an exhaust port 19. The exhaust port 19 is provided rearward of the intake port 18. The intake port 18 connects the internal space of the housing 2 to the external space. The exhaust port 19 connects the internal space of the housing 2 to the external space. The intake ports 18 are provided on both the left and right sides of the motor accommodating section 14. The exhaust ports 19 are provided on both the left and right sides of the rear case 3. As the fan 7 rotates, air from the external space of the housing 2 flows into the internal space of the housing 2 through the intake port 18. The air that has flowed into the internal space of the housing 2 cools the motor 6. The air from the internal space of the housing 2 flows out into the external space of the housing 2 through the exhaust port 19.

[0063] The hammer case 4 houses a reduction gear mechanism, a spindle, and an impact mechanism. The reduction gear mechanism is disposed forward of the motor 6. At least a portion of the spindle is disposed forward of the reduction gear mechanism. The reduction gear mechanism transmits the rotational force generated by the motor 6 to the spindle. The spindle rotates about the rotation axis AX due to the rotational force of the motor 6 transmitted via the reduction gear mechanism. The reduction gear mechanism reduces the rotational speed of the spindle to be lower than the rotational speed of the motor 6. The impact mechanism strikes the anvil 8 in the rotational direction based on the rotation of the spindle.

[0064] The anvil 8 rotates about the rotation axis AX based on the rotational force of the motor 6. The anvil 8 is an output part of the electric work machine 1 driven by a rotor 23 of the motor 6. The anvil 8 has an insertion hole 20 into which a tool bit is inserted. A chuck mechanism 21 for holding the tool bit is provided around at least a portion of the periphery of the anvil 8. The tool bit is inserted into the insertion hole 20 and held by the chuck mechanism 21.

[0065] The controller 9 controls the motor 6. The controller 9 controls the drive current supplied to the motor 6 from the battery pack 17. The controller 9 is housed in the battery connector 16. The controller 9 includes a board on which a plurality of electronic components are mounted. Examples of the electronic components mounted on the board include a processor such as a CPU (Central Processing Unit), a non-volatile memory such as a ROM (Read Only Memory) or storage, a volatile memory such as a RAM (Random Access Memory), a field effect transistor (FET), and a resistor.

[0066] The trigger switch 10 is operated by an operator to drive the motor 6. The trigger switch 10 is provided on the upper part of the grip portion 15. The trigger switch 10 protrudes forward from the upper front part of the grip portion 15. The trigger switch 10 is operated by an operator to move it rearward. When the trigger switch 10 is operated to move it rearward, the motor 6 is driven. When the operation of the trigger switch 10 is released, the motor 6 stops.

[0067] The forward / reverse switching lever 11 is operated by an operator to switch the rotation direction of the motor 6 between forward and reverse. The forward / reverse switching lever 11 is provided at the boundary between the lower end of the motor housing portion 14 and the upper end of the grip portion 15. The forward / reverse switching lever 11 is operated by an operator to move it left or right. By switching the rotation direction of the motor 6, the rotation direction of the anvil 8 is switched.

[0068] The operation panel 12 is disposed in the battery connector 16. The operation panel 12 is plate-shaped. A plurality of operation switches are disposed on the operation panel 12. The operation panel 12 outputs an operation signal when operated by an operator. The controller 9 switches the control mode of the motor 6 based on the operation signal output from the operation panel 12. The control mode of the motor 6 refers to a control method or control pattern of the motor 6.

[0069] The light 13 emits illumination light that illuminates the area in front of the electric work machine 1. The light 13 includes a light emitting diode (LED). The light 13 is provided on the upper front part of the grip portion 15.

[0070] <Motor> Fig. 2 is an exploded front perspective view of a motor 6 according to this embodiment. In this embodiment, the motor 6 is an inner rotor brushless motor. As shown in Fig. 2, the motor 6 has a stator 22A, a rotor 23 that rotates around a rotation axis AX relative to the stator 22A, a power line unit 28 connected to the stator 22A, and a sensor unit 24 that detects the rotation of the rotor 23. The stator 22A is disposed around the rotor 23.

[0071] (Rotor) The rotor 23 has a rotor core 25, a permanent magnet 26, and a rotor shaft 27. The rotor 23 rotates about a rotation axis AX. The rotation of the rotor 23 drives the anvil 8, which is the output part of the electric working machine 1.

[0072] The rotor core 25 includes a plurality of stacked steel plates. The steel plates are made of a metal whose main component is iron. The rotor core 25 is disposed so as to surround the rotation axis AX.

[0073] The permanent magnets 26 are supported by the rotor core 25. In this embodiment, the permanent magnets 26 are arranged inside the rotor core 25. The motor 6 is an interior permanent magnet (IPM) motor. In this embodiment, four permanent magnets 26 are arranged around the rotation axis AX. The rotor core 25 and the permanent magnets 26 are fixed.

[0074] The rotor shaft 27 extends in the front-to-rear direction (axial direction). The rotor shaft 27 is disposed inside the rotor core 25. The rotor core 25 and the rotor shaft 27 are fixed together. The front portion of the rotor shaft 27 protrudes forward from the front end portion of the rotor core 25. The rear portion of the rotor shaft 27 protrudes rearward from the rear end portion of the rotor core 25. The front portion of the rotor shaft 27 is rotatably supported by a front bearing (not shown). The rear portion of the rotor shaft 27 is rotatably supported by a rear bearing (not shown). The front end portion of the rotor shaft 27 is connected to the reduction mechanism described above.

[0075] The fan 7 is disposed rearward of the rotor core 25. The fan 7 is fixed to the rear portion of the rotor shaft 27. At least a portion of the fan 7 is disposed in a position facing the rear end portion of the rotor core 25. When the rotor shaft 27 rotates, the fan 7 rotates together with the rotor shaft 27.

[0076] (stator) Fig. 3 is a front perspective view showing the stator 22A and the sensor unit 24 according to this embodiment. Fig. 4 is an exploded front perspective view showing the stator 22A and the sensor unit 24 according to this embodiment.

[0077] The stator 22A includes a stator core 33, an insulator 34, a coil 35, and a bus bar unit 36.

[0078] The stator core 33 includes a plurality of stacked steel plates. The steel plates are metal plates whose main component is iron. The stator core 33 is arranged around the rotor core 25. The insulators 34 are electrical insulating members made of synthetic resin. The insulators 34 are fixed to the stator core 33. The insulators 34 are integrally molded with the stator core 33. The insulators 34 are fixed to the stator core 33 by, for example, insert molding. A plurality of coils 35 are provided. In this embodiment, six coils are provided. The coils 35 are fixed to the insulators 34. The busbar unit 36 ​​is fixed to the insulators 34.

[0079] Fig. 5 is a front perspective view showing the stator core 33, the insulator 34, and the coil 35 according to this embodiment. Fig. 6 is a front perspective view showing the stator core 33 and the insulator 34 according to this embodiment, and corresponds to Fig. 5 with the coil 35 omitted.

[0080] The stator core 33 has a yoke 37, teeth 38, and an inner wall portion 39. The yoke 37 is cylindrical. The yoke 37 is substantially cylindrical. The yoke 37 is arranged to surround the rotation axis AX. Note that the yoke 37 does not have to be cylindrical, and may be formed by combining multiple split cores. The teeth 38 protrude radially inward from the inner surface of the yoke 37. Multiple teeth 38 are provided in the circumferential direction. In this embodiment, six teeth 38 are provided. The multiple teeth 38 are arranged at intervals in the circumferential direction. The inner wall portion 39 is connected to radially inner ends of the teeth 38. The dimension of the inner wall portion 39 in the circumferential direction is larger than the dimension of the teeth 38. In the circumferential direction, the center positions of the teeth 38 and the inner wall portion 39 coincide with each other. The inner wall portion 39 includes protruding portions that protrude from the inner ends of the teeth 38 to one circumferential side and the other circumferential side.

[0081] The insulator 34 is disposed so as to cover at least a portion of the surface of the stator core 33. The insulator 34 has a front insulator portion 40, a rear insulator portion 41, a tooth covering portion 42, a coil stopper portion 43, a coil stopper portion 44, a coil stopper portion 45, a wire support portion 46, a screw boss portion 47, and a connecting portion 48.

[0082] The front insulator portion 40 is disposed so as to cover at least a portion of the front end surface of the yoke 37 .

[0083] The rear insulator part 41 is disposed so as to cover at least a portion of the rear end surface of the yoke 37 .

[0084] The tooth covering portions 42 are arranged to cover at least a portion of the surface of the teeth 38. The coils 35 are wound around the teeth 38 via the tooth covering portions 42. The tooth covering portions 42 are arranged between the coils 35 and the teeth 38.

[0085] The coil stopper 43 is disposed so as to protrude forward from the front insulator part 40. The coil stopper 43 is connected to the radially outer end of the tooth covering part 42.

[0086] The coil stopper portion 44 is disposed so as to protrude rearward from the rear insulator portion 41. The coil stopper portion 44 is connected to the radially outer end of the tooth covering portion 42.

[0087] The coil stopper 45 is disposed so as to surround the inner wall portion 39. The coil stopper 45 is connected to the radially inner end of the tooth covering portion 42.

[0088] When the coil 35 is wound around the tooth covering portion 42, the coil stopping portion 43 and the coil stopping portion 44 are each positioned radially outward from the coil 35, and the coil stopping portion 45 is positioned radially inward from the coil 35.

[0089] The wire support portion 46 supports a connection wire 51 that connects a pair of circumferentially adjacent coils 35. The wire support portion 46 is provided on the front insulator portion 40. The number of wire support portions 46 provided is the same as the number of coils 35. The wire support portion 46 is arranged radially outward from the coils 35. The wire support portion 46 includes a pair of protrusions 49 that protrude forward from the front insulator portion 40, and a pair of protrusions 50 that protrude forward from the front insulator portion 40. The pair of protrusions 49 are arranged in the circumferential direction. The pair of protrusions 50 are arranged in the circumferential direction. The protrusions 50 are arranged radially outward from the protrusions 49. The connection wire 51 is arranged radially between the protrusions 49 and the protrusions 50.

[0090] The screw boss portions 47 are fixed to the busbar unit 36. The screw boss portions 47 are provided on the front insulator portion 40. The screw boss portions 47 protrude forward from the front insulator portion 40. A plurality of screw boss portions 47 are arranged around the rotation axis AX. In this embodiment, four screw boss portions 47 are provided at intervals in the circumferential direction. A screw hole 61 is formed in each of the screw boss portions 47. A screw 92 is inserted into the screw hole 61 through the busbar unit 36, thereby fixing the front insulator portion 40 and the busbar unit 36 ​​together.

[0091] The connecting portion 48 is connected to the power line unit 28. The connecting portion 48 protrudes radially outward from the lower portion of the front insulator portion 40.

[0092] The coil 35 generates a rotating magnetic field between itself and the rotor 23 when a driving current is supplied from the battery pack 17 via the controller 9 and the power line unit 28. The coil 35 is wound around each of the plurality of teeth 38 via the tooth covering portion 42. A plurality of coils 35 are provided. In this embodiment, six coils 35 are provided.

[0093] The coil 35 is fixed to the insulator 34. The coil 35 and the stator core 33 are insulated by the insulator 34. When the coil 35 is wound around the teeth 38 via the tooth covering portion 42, the coil stopper portion 43 and the coil stopper portion 44 are each positioned radially outward from the coil 35. When the coil 35 is wound around the teeth 38 via the tooth covering portion 42, the coil stopper portion 45 is positioned radially inward from the coil 35.

[0094] The multiple coils 35 are formed by winding a single wire. The connection wire 51 is a portion of the wire between a pair of circumferentially adjacent coils 35. As described above, the connection wire 51 is supported by the wire support portion 46. The connection wire 51 is disposed between the protrusions 49 and 50 in the radial direction. The multiple coils 35 may also be formed by winding two wires. By forming the coils 35 from two wires, the motor 6 can be made to have higher power and larger current.

[0095] FIG. 7 is an exploded perspective view of the bus bar unit 36 ​​according to this embodiment, seen from the front.

[0096] The busbar unit 36 ​​receives a driving current from the battery pack 17 via the controller 9 and the power line unit 28 and supplies it to the coil 35. The driving current from the battery pack 17 is supplied to the busbar unit 36 ​​via the controller 9 and the power line unit 28. The driving current supplied to the busbar unit 36 ​​is controlled by the controller 9.

[0097] The busbar unit 36 ​​is disposed forward of the stator 22 A. At least a portion of the busbar unit 36 ​​is disposed to face the front insulator portion 40.

[0098] The bus bar unit 36 ​​includes an external terminal 63 , a fusing terminal 64 , a short-circuit member 65 , and an insulating member 66 .

[0099] The external terminal 63 is connected to the battery pack 17 via the power line unit 28 and the controller 9. A driving current from the battery pack 17 is supplied to the external terminal 63 via the controller 9 and the power line unit 28. In this embodiment, three external terminals 63 are provided.

[0100] The fusing terminal 64 is connected to the coil 35 via the connection wire 51. The fusing terminal 64 is a conductive member. The connection wire 51 is connected to the fusing terminal 64 while being supported by the wire support portion 46. The connection wire 51 is disposed inside the bent portion of the fusing terminal 64. The fusing terminal 64 and the connection wire 51 are welded together. By welding the fusing terminal 64 and the connection wire 51 together, the fusing terminal 64 is connected to the coil 35 via the connection wire 51.

[0101] A plurality of fusing terminals 64 are arranged around the rotation axis AX. The positions of the plurality of fusing terminals 64 are equal in the axial direction. The number of fusing terminals 64 is the same as the number of coils 35. In this embodiment, six fusing terminals 64 are provided. Note that the number of fusing terminals 64 may differ from the number of coils 35. The number of fusing terminals 64 may be, for example, half the number of coils 35.

[0102] The short-circuiting member 65 connects (short-circuits) a pair of radially opposing connection wires 51. The pair of radially opposing connection wires 51 are spaced apart by 180° in the circumferential direction. The short-circuiting member 65 connects the external terminal 63 and the fusing terminal 64. The short-circuiting member 65 is a conductive member. The short-circuiting member 65 is curved in a plane perpendicular to the rotation axis AX. A plurality of short-circuiting members 65 are provided. In this embodiment, three short-circuiting members 65 are provided. The short-circuiting member 65 connects (short-circuits) one external terminal 63 and two fusing terminals 64.

[0103] The insulating member 66 is made of synthetic resin. The insulating member 66 is disposed so as to surround the rotation axis AX. The insulating member 66 supports each of the external terminal 63 and the short-circuit member 65. The fusing terminal 64 is supported by the insulating member 66 via the short-circuit member 65. The insulating member 66 has a base portion 67, a first screw boss portion 68, a second screw boss portion 69, a positioning pin 70, a positioning recess 71, and a connecting portion 72.

[0104] The base portion 67 is annular. At least a portion of the short-circuit member 65 is disposed inside the base portion 67. The base portion 67 is integrally molded with the short-circuit member 65. The short-circuit member 65 is molded with the synthetic resin that forms the base portion 67. The base portion 67 may be fixed to the short-circuit member 65 by, for example, insert molding. The three short-circuit members 65 are insulated from one another by the base portion 67.

[0105] The first screw boss portion 68 protrudes radially inward from the inner edge portion of the base portion 67. A plurality of first screw boss portions 68 are provided in the circumferential direction. In this embodiment, three first screw boss portions 68 are provided. The three first screw boss portions 68 are arranged at equal intervals in the circumferential direction. A screw hole 73 is formed in the first screw boss portion 68.

[0106] The second screw boss portion 69 protrudes radially outward from the outer edge of the base portion 67. A plurality of second screw boss portions 69 are provided in the circumferential direction. In this embodiment, four second screw boss portions 69 are provided. An opening 74 is formed in the second screw boss portion 69.

[0107] The positioning pin 70 is disposed radially inward of the base portion 67. The insulating member 66 has a support portion 75 that protrudes radially inward from the inner edge of the base portion 67. The positioning pin 70 protrudes forward from the support portion 75. A plurality of support portions 75 and a plurality of positioning pins 70 are provided in the circumferential direction. In this embodiment, two support portions 75 are provided. One positioning pin 70 is provided for each support portion 75.

[0108] The positioning recess 71 is disposed radially outward from the base portion 67. The positioning recess 71 is provided in the second screw boss portion 69. The positioning recess 71 is provided so as to be recessed forward from the rear end surface of the second screw boss portion 69.

[0109] The connecting portion 72 is connected to the power line unit 28. The connecting portion 72 protrudes downward from the lower portion of the base portion 67. The connecting portion 72 faces the connecting portion 48 of the insulator 34. The connecting portion 72 is arranged forward of the connecting portion 48. The connecting portion 72 has recesses 62 in which external terminals 63 are arranged. Three recesses 62 are provided. An external terminal 63 is arranged in each of the three recesses 62.

[0110] (power line unit) The power line unit 28 supplies the driving current supplied from the battery pack 17 via the controller 9 to the bus bar unit 36. As shown in FIGS. 2, 3, and 4, the power line unit 28 has a power line 29, a connection terminal 30, a signal line 143, and a power line holder 52.

[0111] The power supply lines 29 supply a driving current to the coils 35 via the bus bar units 36. In this embodiment, three power supply lines 29 are provided.

[0112] The connection terminal 30 is connected to the power line 29. The connection terminal 30 is connected to the external terminal 63 of the busbar unit 36 ​​at the recess 62 of the coupling portion 72. That is, the connection terminal 30 connects the power line 29 and the short-circuit member 65. In this embodiment, three connection terminals 30 are provided.

[0113] The signal line 143 is connected to a temperature detection element 101 of a temperature detection unit 100A, which will be described later. A detection signal from the temperature detection element 101 is sent to the controller 9 via the signal line 143. In this embodiment, two signal lines 143 are provided.

[0114] The power line holder 52 holds the power line 29, the connection terminal 30, and the signal line 143. The power line holder 52 is connected to the connecting portion 48 of the front insulator part 40 and the connecting portion 72 of the bus bar unit 36, respectively.

[0115] The power line holder 52 has a holding portion 53 , a plate portion 54 , and a hook portion 55 .

[0116] The holding portion 53 holds the connection terminal 30. The holding portion 53 is plate-shaped. The plate portion is disposed rearward of the holding portion 53. The hook portion 55 is provided on the plate portion .

[0117] The power line holder 52 is connected to each of the connecting portion 48 and the connecting portion 72. The plate portion 54 is disposed between the connecting portion 48 and the connecting portion 72. The connecting portion 48 hooks onto at least a portion of the power line holder 52. The hook portion 55 contacts at least a portion of the connecting portion 48. The connection terminal 30 held by the holding portion 53 is disposed in the recess 62 of the connecting portion 72. In the recess 62 of the connecting portion 72, the connection terminal 30 is disposed forward of the external terminal 63 of the busbar unit 36. The connection terminal 30 and the external terminal 63 are connected in the recess 62.

[0118] The driving current from the battery pack 17 is supplied to the external terminal 63 of the busbar unit 36 ​​via the controller 9, the power line 29, and the connection terminal 30. The driving current supplied to the external terminal 63 is supplied to the coil 35 via the short-circuit member 65, the fusing terminal 64, and the connection line 51.

[0119] In this embodiment, the drive current supplied from the controller 9 to the motor 6 includes a U-phase drive current, a V-phase drive current, and a W-phase drive current.

[0120] Power supply lines 29 include a power supply line 29U to which a U-phase drive current is supplied, a power supply line 29V to which a V-phase drive current is supplied, and a power supply line 29W to which a W-phase drive current is supplied.

[0121] Connection terminals 30 include connection terminal 30U connected to power line 29U, connection terminal 30V connected to power line 29V, and connection terminal 30W connected to power line 29W.

[0122] 7, the external terminals 63 include an external terminal 63U connected to the connection terminal 30U, an external terminal 63V connected to the connection terminal 30V, and an external terminal 63W connected to the connection terminal 30W. A U-phase driving current is supplied to the external terminal 63U. A V-phase driving current is supplied to the external terminal 63V. A W-phase driving current is supplied to the external terminal 63W.

[0123] The short-circuiting member 65 includes a short-circuiting member 65U connected to the power supply line 29U via an external terminal 63U, a short-circuiting member 65V connected to the power supply line 29V via an external terminal 63V, and a short-circuiting member 65W connected to the power supply line 29W via an external terminal 63W.

[0124] The fusing terminals 64 include a pair of fusing terminals 64U connected to the short-circuit member 65U, a pair of fusing terminals 64V connected to the short-circuit member 65V, and a pair of fusing terminals 64W connected to the short-circuit member 65W.

[0125] The short-circuiting member 65U connects the external terminal 63U to each of the pair of fusing terminals 64U. The short-circuiting member 65V connects the external terminal 63V to each of the pair of fusing terminals 64V. The short-circuiting member 65W connects the external terminal 63W to each of the pair of fusing terminals 64W. The external terminal 63U, the fusing terminal 64U, and the short-circuiting member 65U are a single member. The external terminal 63V, the fusing terminal 64V, and the short-circuiting member 65V are a single member. The external terminal 63W, the fusing terminal 64W, and the short-circuiting member 65W are a single member.

[0126] If the position of the top end in the circumferential direction is 0°, the position of the left end in the circumferential direction is 90°, the position of the bottom end in the circumferential direction is 180°, and the position of the right end in the circumferential direction is 270°, then the external terminal 63U is positioned at 180°. One fusing terminal 64U is positioned at 150°. The other fusing terminal 64U is positioned at 330°.

[0127] External terminal 63V is positioned at a 180° angle. One fusing terminal 64V is positioned at a 90° angle. The other fusing terminal 64V is positioned at a 270° angle.

[0128] The external terminal 63W is positioned at 180°. One fusing terminal 64W is positioned at 30°. The other fusing terminal 64W is positioned at 210°.

[0129] Each of the six coils 35 is assigned to one of the U (UV) phase, V (VW) phase, and W (WU) phase. Of the six coils 35, two coils 35 are assigned to the U phase, two coils 35 are assigned to the V phase, and two coils 35 are assigned to the W phase. The two coils 35 assigned to the U phase are arranged opposite each other in the radial direction. The two coils 35 assigned to the V phase are arranged opposite each other in the radial direction. The two coils 35 assigned to the W phase are arranged opposite each other in the radial direction.

[0130] (sensor unit) 8 is an exploded perspective view from the rear of the sensor unit 24 according to this embodiment. The sensor unit 24 has a sensor board 76 and a connector 77. The sensor board 76 is disposed forward of the stator core 33. The sensor board 76 has a rotation sensor 78, a plate portion 79, and an insulating member 82.

[0131] The rotation sensor 78 detects the rotation of the rotor 23. The rotation sensor 78 detects the position of the rotor 23 in the rotation direction by detecting the position of the permanent magnet 26 supported by the rotor core 25. The rotation sensor 78 is a magnetic sensor including a Hall element. Three rotation sensors 78 are provided. The rotation sensors 78 are arranged radially inward from the coil 35. The rotation sensors 78 are arranged so as to face the front end face of the rotor core 25.

[0132] The plate portion 79 supports the rotation sensor 78. The plate portion 79 is annular. The plate portion 79 is arranged to surround the rotation axis AX. The plate portion 79 has an opening 88 in which the screw 87 is arranged. A plurality of openings 88 are provided in the plate portion 79. In this embodiment, three openings 88 are provided.

[0133] The plate portion 79 has positioning holes 89 in which the positioning pins 70 are disposed. A plurality of positioning holes 89 are provided in the plate portion 79. In this embodiment, two positioning holes 89 are provided.

[0134] The detection signal of the rotation sensor 78 is output to the controller 9 via the connector 77. The controller 9 supplies a drive current to the coil 35 based on the detection signal of the rotation sensor 78.

[0135] The insulating member 82 covers at least a portion of the surfaces of the rotation sensor 78 and the plate portion 79. The insulating member 82 is made of synthetic resin. In this embodiment, the sensor substrate 76 includes a molded interconnect device (MID).

[0136] <Assembly method for the motor and sensor unit> In the assembly work of the motor 6 and the sensor unit 24, after the insulator 34 is fixed to the stator core 33, the coils 35 are wound around the teeth 38 via the tooth covering portions 42 of the insulator 34. After the coils 35 are wound around the teeth 38 via the tooth covering portions 42, the busbar unit 36 ​​is fixed to the front insulator portions 40 of the insulator 34. After the busbar unit 36 ​​is connected to the front insulator portions 40 of the insulator 34, the sensor unit 24 is connected to the busbar unit 36.

[0137] When connecting the insulating member 66 of the busbar unit 36 ​​and the insulator 34, the screw boss portion 47 of the insulator 34 is placed in the positioning recess 71 of the busbar unit 36. The screw boss portion 47 functions as a positioning protrusion that is placed in the positioning recess 71. This positions the insulating member 66 of the busbar unit 36 ​​and the insulator 34.

[0138] The insulating member 66 of the busbar unit 36 ​​is fixed to the insulator 34. The insulating member 66 of the busbar unit 36 ​​and the insulator 34 are fixed together by screws 92. The screws 92 are engaged with the threaded holes 61 of the threaded boss portions 47 of the insulator 34 through the openings 74 of the second threaded boss portions 69 of the insulating member 66. The screws 92 fix the insulating member 66 of the busbar unit 36 ​​and the insulator 34. At least a portion of the busbar unit 36 ​​is disposed forward of the insulator 34.

[0139] As described above, the connection wire 51 is connected to the fusing terminal 64. In the fusing terminal 64, the connection wire 51 is disposed inside the bent portion of the fusing terminal 64. The connection wire 51 is fixed to the fusing terminal 64 by fusing.

[0140] When connecting the sensor unit 24 and the bus bar unit 36, the positioning pins 70 of the bus bar unit 36 ​​are placed in the positioning holes 89 of the sensor unit 24. This positions the plate portion 79 of the sensor unit 24 and the insulating member 66 of the bus bar unit 36.

[0141] The sensor board 76 of the sensor unit 24 is fixed to the insulating member 66 of the busbar unit 36. The sensor board 76 and the insulating member 66 are fixed together by screws 87. The screws 87 are coupled to the screw holes 73 of the first screw boss portions 68 of the insulating member 66 through openings 88 of the plate portions 79. The screws 87 fix the sensor board 76 and the insulating member 66 of the busbar unit 36 ​​together. At least a portion of the sensor board 76 is disposed radially inward of the insulating member 66 of the busbar unit 36.

[0142] The sensor board 76 is disposed forward of the rotor core 25. The rotation sensor 78 is disposed in a position facing the front end of the rotor core 25. The rotation sensor 78 detects the rotation of the rotor 23 while disposed in a position facing the front end of the rotor core 25. The rotation sensor 78 detects the magnetic flux of the permanent magnet 26, thereby detecting the position of the rotor 23 in the rotational direction.

[0143] <Temperature detection unit> As shown in Fig. 5, the motor 6 has a temperature detection unit 100A. The temperature detection unit 100A is disposed on the stator 22A. One temperature detection unit 100A is disposed on the stator 22A. The temperature detection unit 100A is disposed below the stator core 33. In the circumferential direction, the position of the temperature detection unit 100A and the position of at least a part of the connecting portion 48 are the same.

[0144] FIG. 9 is an exploded perspective view from the front showing the stator core 33, the insulator 34, and the temperature detection unit 100A according to this embodiment. FIG. 10 is an exploded perspective view from the front showing the temperature detection unit 100A according to this embodiment. FIG. 11 is an exploded perspective view from the rear showing the temperature detection unit 100A according to this embodiment. FIG. 12 is a perspective view showing the temperature detection unit 100A arranged in the insulator 34 according to this embodiment. FIG. 13 is a cross-sectional view showing the temperature detection unit 100A arranged in the insulator 34 according to this embodiment, and corresponds to the cross-sectional view taken along the line AA in FIG. 5.

[0145] The temperature detecting unit 100A includes a temperature detecting element 101, a support member 102, a wiring pattern 103, and a cover 104.

[0146] The temperature detection element 101 detects the temperature of at least a part of the stator 22A. In this embodiment, the temperature detection element 101 detects the temperature of the coil 35. In this embodiment, the temperature detection element 101 includes a thermistor.

[0147] The support member 102 supports the temperature detection element 101. The support member 102 includes a first support portion 105 and a second support portion 106. The second support portion 106 is disposed radially outward of the first support portion 105. The dimension of the second support portion 106 in the circumferential direction (left-right direction) is larger than the dimension of the first support portion 105.

[0148] The first support portion 105 has a plate portion 105A and a peripheral wall portion 105B. The plate portion 105A has a front surface facing forward and a rear surface facing rearward. The front surface of the plate portion 105A is the surface of the plate portion 105A on one axial side. The rear surface of the plate portion 105A is the surface of the plate portion 105A on the other axial side. The peripheral wall portion 105B is disposed on the peripheral edge of the front surface of the plate portion 105A. The peripheral wall portion 105B protrudes forward from the front surface of the plate portion 105A.

[0149] The second support portion 106 has a plate portion 106A and a peripheral wall portion 106B. The plate portion 106A has a front surface facing forward and a rear surface facing rearward. The front surface of the plate portion 106A is the surface of the plate portion 106A on one axial side. The rear surface of the plate portion 106A is the surface of the plate portion 106A on the other axial side. The peripheral wall portion 106B is disposed on the peripheral edge of the front surface of the plate portion 106A. The peripheral wall portion 106B protrudes forward from the front surface of the plate portion 106A. Note that the peripheral wall portion 106B is not provided in the radially outer region of the front surface of the plate portion 106A.

[0150] A partition wall 107 is disposed between the first support portion 105 and the second support portion 106. The partition wall 107 is connected to a radially outer end of the peripheral wall portion 105B and a radially inner end of the peripheral wall portion 106B.

[0151] A recess 105C of the first support portion 105 is provided inside the peripheral wall portion 105B and is defined by the peripheral wall portion 105B, the partition wall 107, and the front surface of the plate portion 105A.

[0152] A recess 106C of the second support portion 106 is provided inside the peripheral wall portion 106B and is defined by the peripheral wall portion 106B, the partition wall 107, and the front surface of the plate portion 106A.

[0153] The temperature detection element 101 is supported by the first support portion 105. In this embodiment, the temperature detection element 101 is disposed on the front surface of the first support portion 105. The front surface of the first support portion 105 is the surface of the first support portion 105 on one axial side. The temperature detection element 101 is disposed on the front surface of the plate portion 105A. The front surface of the plate portion 105A is the surface of the plate portion 105A on one axial side. The temperature detection element 101 is disposed inside the recess 105C.

[0154] The wiring pattern 103 is connected to the temperature detection element 101. Two wiring patterns 103 are connected to the temperature detection element 101. A detection signal from the temperature detection element 101 is sent to the controller 9 via the wiring patterns 103.

[0155] The wiring pattern 103 is provided on the support member 102. The wiring pattern 103 is disposed on the front surface of the support member 102. The front surface of the support member 102 is the surface of the support member 102 on one axial side.

[0156] In this embodiment, the support member 102 includes a molded interconnect device (MID). The wiring pattern 103 is formed on the support member 102 by the MID method. The support member 102 is made of a synthetic resin that is applicable to the MID method. An example of a synthetic resin that is applicable to the MID method is a liquid crystal polymer. At least a portion of the surface of the support member 102 is irradiated with a laser beam, and at least a portion of the surface of the support member 102 is modified by the laser beam. After that, the support member 102 is plated, thereby forming the wiring pattern 103 on the surface of the support member 102.

[0157] The wiring pattern 103 includes a terminal portion 103A, a terminal portion 103B, and a connection line portion 103C.

[0158] Terminal portion 103A is disposed on the front surface of plate portion 105A and is connected to temperature detection element 101.

[0159] The terminal portion 103B is disposed on the front surface of the plate portion 106A. The terminal portion 103B is connected to a signal line 143. The terminal portion 103B is connected to the controller 9 via the signal line 143.

[0160] The connection line portion 103C connects the terminal portion 103A and the terminal portion 103B. A portion of the connection line portion 103C is arranged on the front surface of the plate portion 105A. A portion of the connection line portion 103C is arranged on the front surface of the partition wall 107. In this embodiment, a groove 108 is provided on the front surface of the partition wall 107. A portion of the connection line portion 103C is arranged inside the groove 108. A portion of the connection line portion 103C is arranged on the front surface of the plate portion 105A.

[0161] The cover 104 covers the temperature detection element 101. The cover 104 covers the temperature detection element 101 supported by the support member 102. The cover 104 covers at least a portion of the wiring pattern 103 arranged on the support member 102. The cover 104 protects the temperature detection element 101. The cover 104 protects at least a portion of the wiring pattern 103. Note that FIG. 12 shows the temperature detection unit 100A in a state where the cover 104 is omitted.

[0162] In this embodiment, the cover 104 includes a first cover portion 104A and a second cover portion 104B. The first cover portion 104A is disposed in a recess 105C of the first support portion 105. The first cover portion 104A covers the temperature detection element 101 and the wiring pattern 103 disposed on the first support portion 105. The second cover portion 104B is disposed in a groove 108 of the partition wall 107. The second cover portion 104B covers the wiring pattern 103 disposed in the groove 108.

[0163] 9 and 12, the temperature detection unit 100A including the temperature detection element 101 is disposed in a recess 56 provided in the insulator 34. One recess 56 is provided in the insulator 34. The recess 56 is disposed in the lower part of the insulator 34. In the circumferential direction, the position of the recess 56 and the position of at least a part of the connecting portion 48 are the same.

[0164] At least a portion of the recess 56 is provided in the front end portion of the tooth covering portion 42. At least a portion of the recess 56 is provided in the front insulator portion 40.

[0165] The recess 56 includes a first recess 57 and a second recess 58 .

[0166] The first recesses 57 are provided at axial ends of the teeth 38. In this embodiment, the first recesses 57 are provided at front ends of the teeth 38.

[0167] The second recess 58 is provided radially outward of the first recess 57. The second recess 58 is connected to the first recess 57. The dimension of the second recess 58 in the circumferential direction (left-right direction) is larger than the dimension of the first recess 57.

[0168] The second recess 58 is provided at an axial end of the yoke 37. In this embodiment, the second recess 58 is provided at the front end of the yoke 37.

[0169] The support member 102 is disposed in the recess 56. The first support portion 105 of the support member 102 is disposed in the first recess 57. The second support portion 106 of the support member 102 is disposed in the second recess 58.

[0170] The first support portions 105 are disposed on the front end surfaces of the teeth 38. The front end surfaces of the teeth 38 are end surfaces on one axial side of the teeth 38. The second support portions 106 are disposed on the front end surface of the yoke 37. The front end surface of the yoke 37 is the end surface on one axial side of the yoke 37.

[0171] 9, when the temperature detection unit 100A is detached from the stator 22A, the front end face of the stator core 33 is exposed inside the recess 56. When the temperature detection unit 100A is detached from the stator 22A, the front end faces of the teeth 38 are exposed inside the first recess 57, and the front end face of the yoke 37 is exposed inside the second recess 58.

[0172] When the support member 102 is disposed in the recess 56, the rear surface of the support member 102 faces the front end surfaces of the teeth 38. The rear surface of the support member 102 is the surface on the other axial side of the support member 102. In this embodiment, the rear surface of the support member 102 contacts the front end surfaces of the teeth 38. When the support member 102 is disposed in the recess 56, the rear surface of the first support portion 105 contacts the front end surfaces of the teeth 38, and the rear surface of the second support portion 106 contacts the front end surface of the yoke 37.

[0173] 13 , the recesses 56 are disposed between the teeth 38 and the coils 35 in the axial direction (front-rear direction). At least a portion of the recesses 56 is provided between the teeth 38 and the coils 35. In the present embodiment, at least the first recesses 57 are provided between the teeth 38 and the coils 35.

[0174] When the temperature detection unit 100A is placed in the recess 56, the first support 105 is placed between the teeth 38 and the coil 35, the temperature detection element 101 is placed between the first support 105 and the coil 35, and at least a portion of the cover 104 is placed between the temperature detection element 101 and the coil 35. The cover 104 prevents contact between the coil 35 and the temperature detection element 101. The cover 104 protects the temperature detection element 101 from the coil 35. The first support 115 prevents contact between the temperature detection element 101 and the teeth 38. Heat from the coil 35 is transferred to the temperature detection element 101 via the cover 104. The temperature detection element 101 detects the temperature of the coil 35 via the cover 104.

[0175] Next, a manufacturing method of the stator 22A will be described. After the insulator 34 is fixed to the stator core 33, the temperature detection unit 100A is placed in the recess 56 of the insulator 34. The temperature detection unit 100A is placed in the recess 56 so that the rear surface of the support member 102 faces the front end surface of the stator core 33. After the temperature detection unit 100A is placed in the recess 56, the coil 35 is wound around the teeth 38 via the cover 104 and the tooth covering portion 42. After the coil 35 is wound around the teeth 38 via the cover 104 and the tooth covering portion 42, the busbar unit 36 ​​is fixed to the front insulator portion 40, and the sensor unit 24 is connected to the busbar unit 36, as described above.

[0176] Next, we will explain the operation of the electric work machine 1. When the operator operates the trigger switch 10 to move it rearward, the controller 9 drives the motor 6 based on the operation signal from the trigger switch 10. When the motor 6 is driven, the anvil 8, to which the tool bit is attached, rotates.

[0177] The temperature detection element 101 of the temperature detection unit 100A disposed on the stator 22A detects the temperature of the coil 35. A detection signal from the temperature detection element 101 is sent to the controller 9 via the wiring pattern 103 and the signal line 143. When the controller 9 determines, based on the detection signal from the temperature detection element 101, that the temperature of the coil 35 exceeds a predetermined threshold, it stops the motor 6 even if the trigger switch 10 is operated. This prevents a drive current from being supplied to the coil 35, thereby suppressing a temperature rise in the coil 35. If the temperature of the coil 35 rises excessively, the coil 35 may burn out. According to this embodiment, when the temperature detection element 101 detects the temperature of the coil 35 and the controller 9 determines that the temperature of the coil 35 exceeds the predetermined threshold, it stops the supply of a drive current to the coil 35. This suppresses a temperature rise in the coil 35, thereby protecting the coil 35 from burning out.

[0178] <Effects> As described above, according to this embodiment, the electric work machine 1 includes the motor 6, the anvil 8 serving as an output unit, and the temperature detection element 101. The motor 6 includes the stator 22A and the rotor 23 that rotates relative to the stator 22A about the rotation axis AX. The anvil 8 is driven by the rotor 23. The temperature detection element 101 is disposed in the stator 22A. The stator 22A includes a stator core 33, an insulator 34, and a coil 35. The stator core 33 includes a cylindrical yoke 37 and teeth 38 that protrude radially from the yoke 37. The insulator 34 has tooth covering portions 42 that cover at least a portion of the surface of the teeth 38 and is fixed to the stator core 33. The coil 35 is wound around the teeth 38 via the tooth covering portions 42. The temperature detection element 101 is disposed in a recess 56 provided in the insulator 34.

[0179] In the above configuration, the temperature detection element 101 is disposed in the recess 56 of the insulator 34, so that the stator 22A in which the temperature detection element 101 is disposed can be constructed inexpensively. Furthermore, the temperature detection element 101 can properly detect the temperature of the stator 22A.

[0180] In this embodiment, the recesses 56 are disposed between the teeth 38 and the coils 35 in the axial direction (front-rear direction).

[0181] In the above configuration, the temperature detection element 101 is disposed axially between the teeth 38 and the coils 35. This reduces the size of the stator 22A in the axial direction.

[0182] In this embodiment, at least a portion of the recess 56 is provided between the tooth 38 and the coil 35 .

[0183] In the above configuration, the temperature detection element 101 is disposed between the teeth 38 and the coil 35. Therefore, the temperature of the coil 35 can be properly detected by the temperature detection element 101. The motor 6 is air-cooled by the fan 7. Cooling air is supplied to the surface of the coil 35. The temperature of the surface of the coil 35 is likely to fluctuate due to the cooling air. Therefore, if the temperature detection element 101 is disposed on the surface of the coil 35, the detection signal of the temperature detection element 101 may become unstable. Because cooling air is not directly supplied between the coil 35 and the teeth 38, disposing the temperature detection element 101 between the coil 35 and the teeth 38 stabilizes the detection signal of the temperature detection element 101. Therefore, the temperature of the coil 35 can be properly detected by the temperature detection element 101.

[0184] In this embodiment, the electric operating machine 1 includes a support member 102 that supports the temperature detection element 101. The support member 102 is disposed in the recess 56.

[0185] In the above configuration, when forming the wiring pattern 103 connected to the temperature detection element 101 by, for example, the MID method, the wiring pattern 103 may be formed on the support member 102. In other words, instead of forming the wiring pattern on the insulator 34 by the MID method, the manufacturing cost of the wiring pattern 103 is reduced by forming the wiring pattern 103 on the support member 102 that is detachable from the insulator 34 by the MID method.

[0186] In this embodiment, the recesses 56 include first recesses 57 provided at axial ends of the teeth 38. The support member 102 has first support portions 105 arranged in the first recesses 57. The temperature detection element 101 is supported by the first support portions 105.

[0187] In the above configuration, the temperature detection element 101 is disposed on the tooth 38 around which the coil 35 is wound, thereby enabling proper detection of the temperature of the coil 35. The motor 6 is air-cooled by the fan 7. Cooling air is supplied to the surface of the coil 35. The surface temperature of the coil 35 is likely to fluctuate due to the cooling air. Therefore, if the temperature detection element 101 is disposed on the surface of the coil 35, the detection signal of the temperature detection element 101 may become unstable. Since cooling air is not directly supplied between the coil 35 and the tooth 38, disposing the temperature detection element 101 between the coil 35 and the tooth 38 stabilizes the detection signal of the temperature detection element 101. Therefore, the temperature of the coil 35 is properly detected by the temperature detection element 101. Furthermore, since the first recess 57 is disposed at the axial end of the tooth 38, workability when disposing the first support portion 105 in the first recess 57 is suppressed from being reduced.

[0188] In this embodiment, the first support portion 105 is disposed between the teeth and the coil , and the temperature detection element 101 is disposed between the first support portion 105 and the coil .

[0189] In the above configuration, the temperature detection element 101 is disposed at a position closer to the coil 35 than the first support portion 105, and therefore the temperature of the coil 35 can be detected appropriately.

[0190] In this embodiment, the first support portions 105 are disposed on the front end surfaces of the teeth 38 , and the temperature detection elements 101 are disposed in front of the first support portions 105 .

[0191] In the above configuration, the first support portions 105 are disposed on the front end surfaces of the teeth 38, and the temperature detection element 101 is disposed in front of the first support portions 105. This allows the temperature detection element 101 and the first support portions 105 to be properly disposed with respect to the coil 35.

[0192] In this embodiment, the first support portion 105 has a plate portion 105A and a peripheral wall portion 105B disposed on the peripheral edge of the front surface of the plate portion 105A. The temperature detection element 101 may be disposed on the front surface of the plate portion 105A.

[0193] In the above configuration, the peripheral wall 105B is provided on the periphery of the front surface of the plate portion 105A, and the temperature detection element 101 is disposed on the front surface of the plate portion 105A. By surrounding the temperature detection element 101 with the peripheral wall 105B, the coil 35 is prevented from hitting the peripheral wall 105B, preventing direct contact between the coil 35 and the temperature detection element 101, for example. Therefore, the temperature detection element 101 is protected from the coil 35.

[0194] In this embodiment, a wiring pattern 103 is provided which is connected to the temperature detection element 101. The wiring pattern 103 is disposed on the front surface of the support member .

[0195] In the above configuration, the wiring pattern 103 is disposed on the front surface of the support member 102. This allows the temperature detection element 101, the wiring pattern 103, and the signal line 143 to be properly connected in the support member 102. Furthermore, by forming the wiring pattern 103 on the support member 102 based on the MID method, the manufacturing cost of the wiring pattern 103 is reduced.

[0196] In this embodiment, the recess 56 includes a second recess 58 that is provided radially outward of the first recess 57 and is connected to the first recess 57. The support member 102 has a second support portion 106 that is disposed in the second recess 58. The dimension of the second support portion 106 in the circumferential direction is larger than the dimension of the first support portion 105.

[0197] In the above configuration, the dimensions of second support portion 106 are larger than the dimensions of first support portion 105, and therefore, by connecting wiring pattern 103 and signal line 143 at second support portion 106, a decrease in workability when connecting wiring pattern 103 and signal line 143 is suppressed. Furthermore, a step is formed at the boundary between first recess 57 and second recess 58, and a step is formed at the boundary between first support portion 105 and second support portion 106, so that recess 56 and support member 102 can be easily positioned.

[0198] In this embodiment, the second recess 58 is provided at the axial end of the yoke 37.

[0199] In the above configuration, the second support portion 106 is disposed on the yoke 37, so that the workability when disposing the support member 102 in the recess 56 is prevented from being reduced.

[0200] In this embodiment, a cover 104 is provided to cover the temperature detection element 101 supported by the support member 102 .

[0201] In the above configuration, the temperature detection element 101 is protected by the cover 104. When the temperature detection element 101 faces the coil 35, the temperature detection element 101 is protected from the coil 35 by the cover 104.

[0202] [Second embodiment] A second embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiment will be denoted by the same reference numerals, and the description of those components will be simplified or omitted.

[0203] <Temperature detection unit> FIG. 14 is a perspective view from the front showing the stator core 33, the insulator 34, and the temperature detection unit 100B according to this embodiment. FIG. 15 is an exploded perspective view from the front showing the stator core 33, the insulator 34, and the temperature detection unit 100B according to this embodiment. FIG. 16 is an exploded perspective view from the front showing the temperature detection unit 100B according to this embodiment. FIG. 17 is an exploded perspective view from the rear showing the temperature detection unit 100B according to this embodiment. FIG. 18 is a perspective view showing the temperature detection unit 100B arranged in the insulator 34 according to this embodiment. FIG. 19 is a cross-sectional view showing the temperature detection unit 100B arranged in the insulator 34 according to this embodiment.

[0204] The stator 22B has a stator core 33 and an insulator 34. The temperature detection unit 100B is disposed on the stator 22B. One temperature detection unit 100B is disposed on the stator 22B. The temperature detection unit 100B is disposed below the stator core 33. In the circumferential direction, the position of the temperature detection unit 100B and the position of at least a part of the connecting portion 48 are the same.

[0205] The temperature detection unit 100B includes a temperature detection element 111, a support member 112, a wiring pattern 113, and a cover 114.

[0206] The temperature detecting element 111 detects the temperature of at least a part of the stator 22B. The temperature detecting element 111 detects the temperature of the coil 35. The temperature detecting element 111 includes a thermistor.

[0207] The support member 112 supports the temperature detection element 111. The support member 112 includes a first support portion 115 and a second support portion 116. The second support portion 116 is disposed radially outward of the first support portion 115. The dimension of the second support portion 116 in the circumferential direction (left-right direction) is larger than the dimension of the first support portion 115.

[0208] As shown in FIG. 17, the first support portion 105 has a plate portion 115A and a peripheral wall portion 115B. The plate portion 115A has a front surface facing forward and a rear surface facing rearward. The front surface of the plate portion 115A is the surface of the plate portion 115A on one axial side. The rear surface of the plate portion 115A is the surface of the plate portion 115A on the other axial side. The peripheral wall portion 115B is disposed on the peripheral edge of the rear surface of the plate portion 115A. The peripheral wall portion 115B protrudes rearward from the rear surface of the plate portion 115A. A recess 115C of the first support portion 115 is provided inside the peripheral wall portion 115B and is defined by the peripheral wall portion 115B and the rear surface of the plate portion 115A.

[0209] As shown in FIG. 16 , the second support portion 106 has a plate portion 116A and a peripheral wall portion 116B. The plate portion 116A has a front surface facing forward and a rear surface facing rearward. The front surface of the plate portion 116A is the surface of the plate portion 116A on one axial side. The rear surface of the plate portion 116A is the surface of the plate portion 116A on the other axial side. The peripheral wall portion 116B is disposed on the peripheral edge of the front surface of the plate portion 116A. The peripheral wall portion 116B protrudes forward from the front surface of the plate portion 116A. Note that the peripheral wall portion 116B is not provided in the radially outer region of the front surface of the plate portion 116A. A recess 116C of the second support portion 116 is provided inside the peripheral wall portion 116B and is defined by the peripheral wall portion 116B and the front surface of the plate portion 116A.

[0210] The temperature detection element 111 is supported by the first support portion 115. In this embodiment, the temperature detection element 111 is disposed on the rear surface of the first support portion 115. The rear surface of the first support portion 115 is the surface of the first support portion 115 on the other axial side. The temperature detection element 111 is disposed on the rear surface of the plate portion 115A. The rear surface of the plate portion 115A is the surface of the plate portion 115A on the other axial side. The temperature detection element 111 is disposed inside the recess 115C.

[0211] The wiring patterns 113 are connected to the temperature detection elements 111. Two wiring patterns 113 are connected to the temperature detection elements 111. A detection signal from the temperature detection elements 111 is sent to the controller 9 via the wiring patterns 113.

[0212] The wiring pattern 113 is provided on the support member 112. A portion of the wiring pattern 113 is arranged on the rear surface of the support member 112. The rear surface of the support member 112 is the surface of the support member 112 on the other axial side. A portion of the wiring pattern 113 is arranged on the front surface of the support member 112. The front surface of the support member 112 is the surface of the support member 112 on one axial side.

[0213] Similar to the support member 102 described in the first embodiment, the support member 112 includes a molded interconnect device (MID). The wiring pattern 113 is formed on the support member 112 by the MID method.

[0214] The wiring pattern 113 includes a terminal portion 113A, a terminal portion 113B, a connection line portion 113C, and a connection ring portion 113D.

[0215] Terminal portion 113A is disposed on the rear surface of plate portion 115A. Terminal portion 113A is connected to temperature detection element 111.

[0216] The terminal portion 113B is disposed on the front surface of the plate portion 116A. The terminal portion 113B is connected to a signal line 143. The terminal portion 113B is connected to the controller 9 via the signal line 143.

[0217] Connection line portion 113C and connection ring portion 113D connect terminal portion 113A and terminal portion 113B. A portion of connection line portion 113C is disposed on the rear surface of plate portion 115A and the rear surface of plate portion 116A. A portion of connection line portion 113C is disposed on the front surface of plate portion 116A.

[0218] In this embodiment, the support member 112 has through holes 119 that penetrate from the front surface of the support member 112 to the rear surface of the support member 112. The through holes 119 are provided so as to penetrate from the front surface of the plate portion 116A to the rear surface of the plate portion 116A. The number of through holes 119 provided is the same as the number of wiring patterns 113. In this embodiment, two through holes 119 are provided in the plate portion 116A, spaced apart in the circumferential direction (left-right direction).

[0219] The connection ring portion 113D is arranged to surround the through hole 119. A part of the connection ring portion 113D is arranged to surround the through hole 119 on the rear surface of the plate portion 116A. A part of the connection ring portion 113D is arranged to surround the through hole 119 on the front surface of the plate portion 116A. The connection ring portion 113D arranged on the rear surface of the plate portion 116A and the connection ring portion 113D arranged on the front surface of the plate portion 116A are connected (conductive).

[0220] Connection line portions 113C arranged on the rear surface of plate portion 115A and the rear surface of plate portion 116A connect terminal portion 113A to connection ring portion 113D arranged on the rear surface of plate portion 116A. Connection line portion 113C arranged on the front surface of plate portion 116A connects connection ring portion 113D arranged on the front surface of plate portion 116A to terminal portion 113B. A portion of wiring pattern 113 arranged on the rear surface of support member 112 and a portion of wiring pattern 113 arranged on the front surface of support member 112 are connected via through-hole 119 in which connection ring portion 113D is arranged.

[0221] The cover 114 covers the temperature detection element 111. The cover 114 covers the temperature detection element 111 supported by the support member 112. The cover 114 also covers at least a portion of the wiring pattern 113 arranged on the support member 112. The cover 114 protects the temperature detection element 111. The cover 114 protects at least a portion of the wiring pattern 113.

[0222] In this embodiment, the cover 114 includes a first cover portion 114A and a second cover portion 114B. The first cover portion 114A is disposed in a recess 115C of the first support portion 115. The first cover portion 114A covers the temperature detection element 111 and the wiring pattern 113 disposed on the rear surface of the first support portion 115. The second cover portion 114B is disposed so as to cover a portion of the rear surface of the second support portion 116. The second cover portion 114B covers the connection line portion 113C and the connection ring portion 113D disposed on the rear surface of the second support portion 116.

[0223] 15 and 18, the temperature detection unit 100B including the temperature detection element 111 is disposed in a recess 56 provided in the insulator 34. One recess 56 is provided in the insulator 34. The recess 56 is disposed in the lower part of the insulator 34. In the circumferential direction, the position of the recess 56 and the position of at least a part of the connecting portion 48 are the same.

[0224] At least a portion of the recess 56 is provided in the front end portion of the tooth covering portion 42. At least a portion of the recess 56 is provided in the front insulator portion 40.

[0225] Similar to the above-described embodiment, the recesses 56 include a first recess 57 and a second recess 58. The first recess 57 is provided at the front end of the tooth 38. The second recess 58 is provided at the front end of the yoke 37.

[0226] The support member 112 is disposed in the recess 56. The first support portion 115 of the support member 112 is disposed in the first recess 57. The second support portion 116 of the support member 112 is disposed in the second recess 58.

[0227] The first support portion 115 is disposed on the front end surface of the tooth 38. The second support portion 106 is disposed on the front end surface of the yoke 37.

[0228] 15, when the temperature detection unit 100B is detached from the stator 22B, the front end face of the stator core 33 is exposed inside the recess 56. When the temperature detection unit 100B is detached from the stator 22B, the front end faces of the teeth 38 are exposed inside the first recess 57, and the front end face of the yoke 37 is exposed inside the second recess 58.

[0229] When the support member 112 is disposed in the recess 56, the rear surface of the support member 112 faces the front end surfaces of the teeth 38. When the support member 112 is disposed in the recess 56, at least a portion of the rear surface of the first support portion 115 contacts the front end surfaces of the teeth 38, and at least a portion of the rear surface of the second support portion 116 contacts the front end surface of the yoke 37.

[0230] 19 , the recesses 56 are disposed between the teeth 38 and the coils 35 in the axial direction (front-rear direction). At least a portion of the recesses 56 is provided between the teeth 38 and the coils 35. At least the first recesses 57 are provided between the teeth 38 and the coils 35.

[0231] When the temperature detection unit 100B is placed in the recess 56, the first support 115 is placed between the teeth 38 and the coil 35, the temperature detection element 111 is placed between the first support 115 and the teeth 38, and at least a portion of the cover 114 is placed between the temperature detection element 111 and the teeth 38. The cover 114 prevents contact between the temperature detection element 111 and the teeth 38. The first support 115 prevents contact between the coil 35 and the temperature detection element 111. Heat from the coil 35 is transferred to the temperature detection element 111 via the first support 115. The temperature detection element 111 detects the temperature of the coil 35 via the cover 114.

[0232] Next, a method for manufacturing the stator 22B will be described. After the insulator 34 is fixed to the stator core 33, the temperature detection unit 100B is placed in the recess 56 of the insulator 34. The temperature detection unit 100B is placed in the recess 56 so that the rear surface of the support member 112 and the cover 114 face the front end surface of the stator core 33. After the temperature detection unit 100B is placed in the recess 56, the coil 35 is wound around the teeth 38 via the first support portion 115 and the tooth covering portion 42. After the coil 35 is wound around the teeth 38 via the first support portion 115 and the tooth covering portion 42, the busbar unit 36 ​​is fixed to the front insulator portion 40, and the sensor unit 24 is connected to the busbar unit 36, as described above.

[0233] <Effects> As described above, according to this embodiment, the first support portion 115 is disposed between the teeth and the coil 35, and the temperature detection element 111 is disposed between the first support portion 115 and the teeth .

[0234] In the above configuration, the temperature detection element 111 is disposed at a position farther from the coil 35 than the first support portion 115 is, and therefore the temperature detection element 111 is protected from the coil 35.

[0235] In this embodiment, the first support portions 115 are disposed on the front end surfaces of the teeth 38 , and the temperature detection elements 111 are disposed on the rear surfaces of the first support portions 115 .

[0236] In the above configuration, the first support portions 115 are disposed on the front end surfaces of the teeth 38, and the temperature detection elements 111 are disposed on the rear surfaces of the first support portions 115. This allows the temperature detection elements 111 and the first support portions 115 to be properly disposed with respect to the coil 35.

[0237] In this embodiment, the first support portion 115 has a plate portion 115A and a peripheral wall portion 115B that is disposed on the peripheral edge of the rear surface of the plate portion 115A. The temperature detection element 111 is disposed on the rear surface of the plate portion 115A.

[0238] In the above configuration, the peripheral wall 115B is provided on the peripheral edge of the rear surface of the plate portion 115A, and the temperature detection element 111 is disposed on the rear surface of the plate portion 115A. By surrounding the temperature detection element 111 with the peripheral wall 115B, the teeth 38 are prevented from abutting the peripheral wall 115B, which prevents, for example, direct contact between the teeth 38 and the temperature detection element 111. Therefore, the temperature detection element 111 is protected from the teeth 38.

[0239] In this embodiment, a wiring pattern 113 is provided that is connected to the temperature detection element 111. A portion of the wiring pattern 113 is disposed on the rear surface of the support member 112, and a portion of the wiring pattern 113 is disposed on the front surface of the support member 112.

[0240] In the above configuration, a portion of the wiring pattern 113 is disposed on the rear surface of the support member 112, and a portion of the wiring pattern 113 is disposed on the front surface of the support member 112. This allows the temperature detection element 111, the wiring pattern 113, and the signal line 143 to be properly connected in the support member 112. Furthermore, by forming the wiring pattern 113 on the support member 112 based on the MID method, the manufacturing cost of the wiring pattern 113 is reduced.

[0241] In this embodiment, the support member 112 has a through hole 119 that penetrates from the rear surface of the support member 112 to the front surface of the support member 112. A portion of the wiring pattern 113 arranged on the rear surface of the support member 112 and a portion of the wiring pattern 113 arranged on the front surface of the support member 112 are connected via the through hole 119.

[0242] In the above configuration, a through hole 119 is provided in the support member 112, so that the wiring pattern 113 arranged on the rear surface of the support member 112 and the wiring pattern 113 arranged on the front surface of the support member 112 are connected via the through hole 119.

[0243] In this embodiment, a cover 114 is provided to cover the temperature detection element 111 supported by the support member 112 .

[0244] In the above configuration, the temperature detection element 111 is protected by the cover 114. When the temperature detection element 111 faces the teeth , the temperature detection element 111 is protected from the teeth by the cover 114.

[0245] [Third embodiment] A third embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiment will be denoted by the same reference numerals, and the description of those components will be simplified or omitted.

[0246] <Temperature detection unit> FIG. 20 is a perspective view from the front showing the stator core 33, the insulator 34, and the temperature detection unit 100C according to this embodiment. FIG. 21 is an exploded perspective view from the front showing the stator core 33, the insulator 34, and the temperature detection unit 100C according to this embodiment. FIG. 22 is an exploded perspective view from the front showing the temperature detection unit 100C according to this embodiment. FIG. 23 is an exploded perspective view from the rear showing the temperature detection unit 100C according to this embodiment. FIG. 24 is a perspective view showing the temperature detection unit 100C arranged in the insulator 34 according to this embodiment. FIG. 25 is a cross-sectional view showing the temperature detection unit 100C arranged in the insulator 34 according to this embodiment.

[0247] The stator 22C has a stator core 33 and an insulator 34. The temperature detection unit 100C is disposed on the stator 22C. One temperature detection unit 100C is disposed on the stator 22C. The temperature detection unit 100C is disposed below the stator core 33. In the circumferential direction, the position of the temperature detection unit 100C and the position of at least a part of the connecting portion 48 are the same.

[0248] The temperature detection unit 100C includes a temperature detection element 121, a support member 122, a wiring pattern 123, a connection member 132, and a cover .

[0249] The temperature detection element 121 detects the temperature of at least a part of the stator 22C. The temperature detection element 121 detects the temperature of the coil 35. The temperature detection element 121 includes a thermistor.

[0250] The support member 122 supports the temperature detection element 121. The support member 122 is plate-shaped. The support member 122 includes a first support portion 125 and a second support portion 126. The second support portion 126 is disposed radially outward of the first support portion 125. The dimension of the second support portion 126 in the circumferential direction (left-right direction) is larger than the dimension of the first support portion 125.

[0251] The temperature detection element 121 is supported by the first support portion 125. In this embodiment, the temperature detection element 121 is disposed on the front surface of the first support portion 125. The front surface of the first support portion 125 is the surface of the first support portion 125 on one axial side.

[0252] The wiring patterns 123 are connected to the temperature detection elements 121. Two wiring patterns 123 are connected to the temperature detection elements 121. A detection signal from the temperature detection elements 121 is sent to the controller 9 via the wiring patterns 123.

[0253] The wiring pattern 123 is provided on the support member 122. The wiring pattern 123 is disposed on the front surface of the support member 122. The front surface of the support member 122 is the surface of the support member 122 on one axial side.

[0254] In this embodiment, the support member 122 includes a printed wiring board (PWB). The support member 122 includes an insulating substrate. The wiring pattern 123 is disposed on the front surface of the support member 122. The temperature detection element 121 is mounted on the front surface of the support member 122.

[0255] The wiring pattern 123 includes a terminal portion 123A, a terminal portion 123B, and a connection line portion 123C.

[0256] The terminal portion 123A is disposed on the front surface of the first support portion 125. The terminal portion 123A is connected to the temperature detection element 111.

[0257] The terminal portion 123B is disposed on the front surface of the second support portion 126. The second support portion 126 includes a printed wiring board (PWB). The terminal portion 123B is connected to a signal line 143. The terminal portion 123B is connected to the controller 9 via the signal line 143.

[0258] The connection line portion 123C connects the terminal portion 123A and the terminal portion 123B.

[0259] The connecting member 132 is connected to the front surface of the support member 122. The connecting member 132 has a protrusion 136E that protrudes rearward from the rear surface of the connecting member 132. Two protrusions 136E are provided at a distance in the vertical direction. The support member 122 has support holes 129 into which the protrusions 136E are inserted. Two support holes 129 are provided at a distance in the vertical direction. The connecting member 132 and the support member 122 are connected by inserting each of the two protrusions 136E into the support holes 129. The rear surface of the connecting member 132 and the front surface of the support member 122 come into contact.

[0260] The connecting member 132 includes a first connecting portion 135 and a second connecting portion 136. The first connecting portion 135 is connected to the front surface of the first supporting portion 125. The second connecting portion 136 is connected to the front surface of the second supporting portion 126.

[0261] The first connecting portion 135 has a frame portion 135B. An opening 135C is formed inside the frame portion 135B. By connecting the first connecting portion 135 to the front surface of the first supporting portion 125, the frame portion 135B functions as a peripheral wall portion that is disposed on the peripheral edge of the front surface of the first supporting portion 125.

[0262] The second connecting portion 136 has a frame portion 136B and a partition portion 136D. The frame portions 136B are disposed at the left and right ends of the second connecting portion 136. In the left-right direction, the partition portion 136D is disposed between the pair of frame portions 136B. An opening 136C is provided between the frame portions 136B and the partition portion 136D. By connecting the second connecting portion 136 to the front surface of the second supporting portion 126, the frame portion 136B functions as a peripheral wall portion disposed on part of the peripheral edge of the front surface of the second supporting portion 126.

[0263] The cover 124 covers the temperature detection element 121. The cover 124 covers the temperature detection element 121 supported by the first support part 125. The cover 124 also covers at least a portion of the wiring pattern 123 arranged on the first support part 125. The cover 124 protects the temperature detection element 121. The cover 124 protects at least a portion of the wiring pattern 123. Note that FIG. 24 shows the temperature detection unit 100C in a state in which the cover 124 is omitted.

[0264] By connecting first connection portion 135 to the front surface of first support portion 125, a recess is provided inside frame portion 135B, which is defined by frame portion 135B and the front surface of first support portion 125. Cover 124 is placed in the recess defined by frame portion 135B and the front surface of first support portion 125.

[0265] 21 and 24, the temperature detection unit 100C including the temperature detection element 121 is disposed in a recess 56 provided in the insulator 34. One recess 56 is provided in the insulator 34. The recess 56 is disposed in the lower part of the insulator 34. In the circumferential direction, the position of the recess 56 and the position of at least a part of the connecting portion 48 are the same.

[0266] At least a portion of the recess 56 is provided in the front end portion of the tooth covering portion 42. At least a portion of the recess 56 is provided in the front insulator portion 40.

[0267] Similar to the above-described embodiment, the recesses 56 include a first recess 57 and a second recess 58. The first recess 57 is provided at the front end of the tooth 38. The second recess 58 is provided at the front end of the yoke 37.

[0268] The support member 122 is disposed in the recess 56. The first support portion 125 of the support member 122 is disposed in the first recess 57. The second support portion 126 of the support member 122 is disposed in the second recess 58.

[0269] The first support portion 125 is disposed on the front end surface of the tooth 38. The second support portion 126 is disposed on the front end surface of the yoke 37.

[0270] 21 , when the temperature detection unit 100C is detached from the stator 22C, the front end face of the stator core 33 is exposed inside the recess 56. When the temperature detection unit 100C is detached from the stator 22C, the front end faces of the teeth 38 are exposed inside the first recess 57, and the front end face of the yoke 37 is exposed inside the second recess 58.

[0271] When the support member 122 is disposed in the recess 56, the rear surface of the support member 122 faces the front end surface of the stator core 33. When the support member 122 is disposed in the recess 56, at least a portion of the rear surface of the first support portion 125 contacts the front end surface of the tooth 38, and at least a portion of the rear surface of the second support portion 126 contacts the front end surface of the yoke 37.

[0272] 25 , the recesses 56 are disposed between the teeth 38 and the coils 35 in the axial direction (front-rear direction). At least a portion of the recesses 56 is provided between the teeth 38 and the coils 35. At least the first recesses 57 are provided between the teeth 38 and the coils 35.

[0273] When the temperature detection unit 100C is placed in the recess 56, the first support 125 is placed between the teeth 38 and the coil 35, the temperature detection element 121 is placed between the first support 125 and the coil 35, and at least a portion of the cover 124 is placed between the temperature detection element 121 and the coil 35. The cover 124 prevents contact between the temperature detection element 111 and the coil 35. The first support 125 prevents contact between the temperature detection element 111 and the teeth 38. Heat from the coil 35 is transferred to the temperature detection element 121 via the cover 124. The temperature detection element 121 detects the temperature of the coil 35 via the cover 124.

[0274] Next, a method for manufacturing the stator 22C will be described. After the insulator 34 is fixed to the stator core 33, the temperature detection unit 100C is placed in the recess 56 of the insulator 34. The temperature detection unit 100C is placed in the recess 56 so that the rear surface of the support member 122 faces the front end surface of the stator core 33. After the temperature detection unit 100C is placed in the recess 56, the coil 35 is wound around the teeth 38 via the cover 124 and the tooth covering portion 42. After the coil 35 is wound around the teeth 38 via the cover 124 and the tooth covering portion 42, the busbar unit 36 ​​is fixed to the front insulator portion 40, and the sensor unit 24 is connected to the busbar unit 36, as described above.

[0275] <Effects> As described above, according to this embodiment, since the support member 122 is formed of a printed wiring board, the stator 22C on which the temperature detection element 121 is disposed can be formed inexpensively. Furthermore, the temperature detection element 121 can properly detect the temperature of the stator 22C.

[0276] [Fourth embodiment] A fourth embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiments are denoted by the same reference numerals, and the description of these components will be simplified or omitted.

[0277] <Temperature detection unit> FIG. 26 is a front perspective view of stator 22D according to this embodiment. FIG. 27 is an exploded front perspective view of stator 22D according to this embodiment. FIG. 28 is a front perspective view of stator core 330, insulator 340, and coil 350 according to this embodiment. FIG. 29 is a front perspective view of stator core 330 and insulator 340 according to this embodiment. FIG. 30 is an exploded front perspective view of stator core 330, insulator 340, and cover 134 according to this embodiment. FIG. 31 is a diagram showing temperature detection element 131 and wiring pattern 133 according to this embodiment.

[0278] <Temperature detection unit> The stator 22D includes a stator core 330, an insulator 340, a coil 350, a bus bar unit 360, and a power line unit 280.

[0279] The insulator 340 is fixed to the stator core 330. The insulator 340 is fixed to the stator core 330 by, for example, insert molding. A plurality of coils 350 is provided. In this embodiment, twelve coils 350 are provided. The coils 350 are fixed to the insulator 340.

[0280] 26, 27, and 28, the insulator 340 has a front insulator portion 400, a screw boss portion 470, and a connecting portion 480. A screw hole 610 is formed in the screw boss portion 470. The connecting portion 480 is provided in the lower portion of the front insulator portion 400. Furthermore, as shown in FIGS. 30 and 31, the insulator 340 has tooth covering portions 420 that cover the surfaces of the teeth 380 of the stator core 330, and coil stop portions 450 that are connected to the radially inner side of the tooth covering portions 420.

[0281] Busbar unit 360 has a plurality of fusing terminals 640. A plurality of openings 740 are provided on the outer periphery of busbar unit 360. Screws 920 are inserted into screw holes 610 through openings 740. Busbar unit 360 and insulator 340 are fixed together by the plurality of screws 920.

[0282] The busbar unit 360 has recesses 620 in which external terminals 630 of the busbar unit 360 are arranged. The recesses 620 are provided in the connecting portions 720 of the busbar unit 360. The connecting portions 720 are arranged in the lower portion of the busbar unit 360. Three recesses 620 are provided. An external terminal 630 is arranged in each of the three recesses 620.

[0283] The power line unit 280 has three power lines 290 , three connection terminals 300 , two signal lines 1430 , and a power line holder 520 .

[0284] As in the above-described embodiment, the power supply line 290 supplies a driving current to the coil 350 via the connection terminal 300 and the bus bar unit 360 .

[0285] Power line holder 520 holds power line 290, connection terminal 300, and signal line 1430. Power line holder 520 is connected to connecting portion 720 of bus bar unit 360.

[0286] The connection terminal 300 of the power line unit 280 is placed in the recess 620 of the coupling portion 720. The connection terminal 300 and the external terminal 630 are fixed in the recess 620 by a screw 93. The connection terminal 300 and the external terminal 630 are each ring-shaped. The screw 93 is inserted into the inside of the connection terminal 300 and the inside of the external terminal 630, and then inserted into a screw hole provided in the coupling portion 720. This connects the connection terminal 300 and the external terminal 630, and the power line holder 520 and the coupling portion 720 of the busbar unit 360 are fixed by the screw 93.

[0287] The signal line 1430 is fixed to the connecting portion 480 of the front insulator part 400 by a screw 94. A screw hole 95 is provided in the connecting portion 480. The screw 94 is inserted into the screw hole 95. Two screw holes 95 are provided. The screw 94 has a threaded portion and a head. The screw 94 is inserted into the screw hole 95 from in front of the connecting portion 480. The threaded portion of the screw 94 is inserted into the screw hole 95 so that the end of the signal line 1430 is sandwiched between the head of the screw 94 and the front surface of the connecting portion 480. With the end of the signal line 1430 sandwiched between the head of the screw 94 and the front surface of the connecting portion 480, the signal line 1430 and the connecting portion 480 are fixed by the screw 94.

[0288] As shown in FIG. 31 , a recess 560 is provided in the tooth covering portion 420. The temperature detection element 131 of the temperature detection unit 100D is arranged inside the recess 560. The front end surfaces of the teeth 380 are exposed inside the recess 560. In this embodiment, the temperature detection element 131 is not supported by a support member and is arranged on the front end surfaces of the teeth 380. A wiring pattern 133 is connected to the temperature detection element 131. At least a portion of the wiring pattern 133 is arranged on the front end surfaces of the teeth 380. At least a portion of the wiring pattern 133 is arranged on the insulator 340.

[0289] The wiring pattern 133 includes a terminal portion 133A connected to the temperature detection element 131, a terminal portion 133B arranged around the screw hole 95, and a connection line portion 133C connecting the terminal portion 133A and the terminal portion 133B. The terminal portion 133A is arranged on the front end surface of the tooth 380. The terminal portion 133B is arranged around the screw hole 95 on the front surface of the coupling portion 480. A portion of the connection line portion 133C is arranged on the front end surface of the tooth 380, and a portion of the connection line portion 133C is arranged on the front surface of the front insulator portion 400.

[0290] 29 and 30, the temperature detection element 131 is covered with a cover 134. The cover 134 is disposed in the recess 560. Fig. 31 shows the stator core 330 and the insulator 340 in a state where the cover 134 is omitted.

[0291] Signal line 1430 is connected to terminal portion 133B. With the end of signal line 1430 in contact with terminal portion 133B of wiring pattern 133, the threaded portion of screw 94 is inserted into screw hole 95, whereby signal line 1430 is sandwiched between the head of screw 94 and the front surface of coupling portion 480 with the end of signal line 1430 in contact with terminal portion 133B of wiring pattern 133. With the threaded portion of screw 94 inserted into screw hole 95 with the end of signal line 1430 in contact with terminal portion 133B of wiring pattern 133, screw 94 can fix signal line 1430 to coupling portion 480 of insulator 340 with the end of signal line 1430 in contact with terminal portion 133B of wiring pattern 133.

[0292] <Effects> As described above, according to the present embodiment, the temperature detection elements 131 are disposed on the teeth 380 of the stator 22D, and the covers 134 cover the temperature detection elements 131. The coils 350 are wound around the teeth 380 via the covers 134 and the tooth covering portions 420.

[0293] In the above configuration, coil 350 is wound around teeth 380 via cover 134 that covers temperature detection element 131 and tooth covering portion 420, so stator 22D in which temperature detection element 131 is disposed can be configured inexpensively.

[0294] In this embodiment, the wiring pattern 133 is connected to the temperature detection element 131. The power line 290 supplies a driving current to the coil 350. The power line holder 520 holds the power line 290 and the signal line 1430. The screw 94 fixes the signal line 1430 to the insulator 340. At least a portion of the wiring pattern 133 is disposed in the insulator 340. The screw 94 fixes the signal line 1430 to the insulator 340 with the signal line 1430 in contact with the wiring pattern 133.

[0295] In the above configuration, the signal line 1430 and the wiring pattern 133 are connected by the screw 94, so that the stator 22D on which the temperature detection element 131 is disposed can be constructed inexpensively.

[0296] [Fifth embodiment] A fifth embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiments are denoted by the same reference numerals, and the description of these components will be simplified or omitted.

[0297] 32 is a diagram showing a temperature detection unit 100E according to this embodiment. The temperature detection unit 100E has a holder 142 and lead wires 145. A temperature detection element such as a thermistor is disposed inside the holder 142. The holder 142 is formed from thermally conductive polyphenylene sulfide (PPS) resin. The lead wires 145 are connected to the temperature detection element disposed inside the holder 142. Epoxy resin is disposed as filler 144 at the boundary between the holder 142 and the lead wires 145.

[0298] The temperature detection unit 100E shown in Fig. 32 may be disposed on the stator (22A, 22B, 22C, 22D). A holder 142 may be disposed around the teeth.

[0299] [Other embodiments] In the above-described embodiment, the electric work machine 1 is an impact driver, which is a type of power tool. The power tool is not limited to an impact driver. Examples of the power tool include a driver drill, a percussion driver drill, an angle drill, a screwdriver, a hammer, a hammer drill, a circular saw, and a reciprocating saw.

[0300] In the above-described embodiment, the electric work machine 1 may be a gardening tool (outdoor power equipment). Examples of gardening tools include a chainsaw, a hedge trimmer, a lawn mower, a brush cutter, and a blower.

[0301] In the above-described embodiment, the electric working machine may be a cleaner.

[0302] In the above-described embodiment, the battery pack 17 attached to the battery attachment portion is used as the power source for the electric working machine. A commercial power source (AC power source) may also be used as the power source for the electric working machine. [Explanation of symbols]

[0303] 1...electric work machine, 2...housing, 3...rear case, 4...hammer case, 5...battery mounting section, 6...motor, 7...fan, 8...anvil, 9...controller, 10...trigger switch, 11...forward / reverse switching lever, 12...operation panel, 13...light, 14...motor housing section, 15...grip section, 16...battery connector section, 17...battery pack, 18...air intake port, 19...exhaust port, 20...insertion hole, 21...chuck mechanism, 22A...stator, 22B...stator, 22C...stator, 22D...stator, 23...rotor, 24...sensor unit, 25...rotor core, 26 ...permanent magnet, 27...rotor shaft, 28...power line unit, 29...power line, 29U...power line, 29V...power line, 29W...power line, 30...connection terminal, 30U...connection terminal, 30V...connection terminal, 30W...connection terminal, 33...stator core, 34...insulator, 35...coil, 36...busbar unit, 37...yoke, 38...teeth, 39...inner wall portion, 40...front insulator portion, 41...rear insulator portion, 42...teeth covering portion, 43...coil stopper portion, 44...coil stopper portion, 45...coil stopper portion, 46...wire support portion, 47...screw boss portion, 48...connection portion, 49...projection 1. Projection portion, 50...projection portion, 51...connection wire, 52...power line holder, 53...holding portion, 54...plate portion, 55...hook portion, 56...recess, 57...first recess, 58...second recess, 61...screw hole, 62...recess, 63...external terminal, 63U...external terminal, 63V...external terminal, 63W...external terminal, 64...fusing terminal, 64U...fusing terminal, 64V...fusing terminal, 64W...fusing terminal, 65...short-circuit member, 65U...short-circuit member, 65V...short-circuit member, 65W...short-circuit member, 66...insulating member, 67...base portion, 68...first screw boss portion, 69...second screw boss portion, 70...position Positioning pin, 71...positioning recess, 72...connecting portion, 73...screw hole, 74...opening, 75...support portion, 76...sensor board, 77...connector, 78...rotation sensor, 79...plate portion, 82...insulating member, 87...screw, 88...opening, 89...positioning hole, 92...screw, 93...screw, 94...screw, 95...screw hole, 100A...temperature detection unit, 100B...temperature detection unit, 100C...temperature detection unit, 100D...temperature detection unit, 100E...temperature detection unit, 101...temperature detection element, 102...support member, 103...wiring pattern, 103A...terminal portion, 103B...terminal portion,103C...connection line portion, 104...cover, 104A...first cover portion, 104B...second cover portion, 105...first support portion, 105A...plate portion, 105B...circumferential wall portion, 105C...recess, 106...second support portion, 106A...plate portion, 106B...circumferential wall portion, 106C...recess, 107...compartment wall, 108...groove, 111...temperature detection element, 112...support member, 113...wiring pattern, 113A...terminal portion, 113B...terminal portion, 113C...connection line portion, 113D...connection ring portion , 114...cover, 114A...first cover portion, 114B...second cover portion, 115...first support portion, 115A...plate portion, 115B...circumferential wall portion, 115C...recess, 116...second support portion, 116A...plate portion, 116B...circumferential wall portion, 116C...recess, 119...through hole, 121...temperature detection element, 122...support member, 123...wiring pattern, 123A...terminal portion, 123B...terminal portion, 123C...connection line portion, 124...cover, 125...first support portion, 126...second support portion, 1 29...support hole, 131...temperature detection element, 132...connection member, 133...wiring pattern, 133A...terminal portion, 133B...terminal portion, 133C...connection line portion, 135...first connection portion, 135B...frame portion, 135C...opening, 136...second connection portion, 136B...frame portion, 136C...opening, 136D...partition portion, 136E...protrusion portion, 134...cover, 142...holder, 143...signal line, 144...filler, 145...lead wire, 280...power line unit, 290...power line, 30 0...connection terminal, 330...stator core, 340...insulator, 350...coil, 360...busbar unit, 380...teeth, 400...front insulator portion, 420...teeth covering portion, 450...coil stop portion, 470...screw boss portion, 480...connecting portion, 520...power line holder, 560...recess, 610...screw hole, 620...recess, 630...external terminal, 640...fusing terminal, 720...connecting portion, 740...opening, 920...screw, 1430...signal line, AX...rotating axis.

Claims

1. a motor having a stator and a rotor that rotates about a rotation axis relative to the stator; an output section driven by the rotor; a temperature detection element disposed on the stator; a support member for supporting the temperature detection element, the stator includes a stator core including a yoke and teeth projecting radially from the yoke, an insulator having a tooth covering portion covering at least a portion of a surface of the teeth and fixed to the stator core, and a coil wound around the teeth via the tooth covering portion, The support member is disposed in a recess provided in the insulator, the recesses include first recesses provided at axial ends of the teeth, and second recesses provided at axial ends of the yoke radially outside the first recesses and connected to the first recesses, the support member has a first support portion disposed in the first recess and a second support portion disposed in the second recess, the temperature detection element is supported by the first support portion, the first support portion and the first recess portion are disposed between the tooth and the coil, the temperature detection element is disposed between the first support portion and the coil, In the circumferential direction, a dimension of the second support portion is larger than a dimension of the first support portion. Electric work equipment.

2. the first support portion is disposed on an end surface of the tooth on one axial side, The temperature detection element is disposed on a surface of the first support portion on one axial side. The electric operating machine according to claim 1 .

3. the first support portion has a plate portion and a peripheral wall portion disposed on a peripheral edge portion of a surface of the plate portion on one axial side, The temperature detection element is disposed on a surface of the plate portion on one axial side. The electric operating machine according to claim 2.

4. a wiring pattern connected to the temperature detection element; The wiring pattern is disposed on a surface of the support member on one axial side. The electric operating machine according to claim 2 or 3.

5. the first support portion is disposed on an end surface of the tooth on one axial side, the temperature detection element is disposed on a surface of the first support portion on the other axial side; The electric operating machine according to claim 1 .

6. the first support portion has a plate portion and a peripheral wall portion disposed on a peripheral edge portion of a surface of the plate portion on the other axial side, the temperature detection element is disposed on the surface of the plate portion on the other axial side; The electric operating machine according to claim 5.

7. a wiring pattern connected to the temperature detection element, a part of the wiring pattern is disposed on a surface of the support member on the other axial side; a part of the wiring pattern is disposed on a surface of the support member on one axial side; The electric operating machine according to claim 5 or 6.

8. the support member has a through hole that penetrates a surface of the support member on the other axial side and a surface of the support member on the one axial side, a part of the wiring pattern arranged on the surface of the support member on the other axial side and a part of the wiring pattern arranged on the surface of the support member on one axial side are connected via the through hole; The electric operating machine according to claim 7.

9. a cover for covering the temperature detection element supported by the support member; The electric operating machine according to any one of claims 1 to 8.

10. a motor having a stator and a rotor that rotates about a rotation axis relative to the stator; an output section driven by the rotor; a temperature detection element disposed on the stator; a support member including a first support portion that supports the temperature detection element and a second support portion that is provided radially outward of the first support portion; a wiring pattern that is disposed on each of the first support portion and the second support portion and is connected to the temperature detection element; a cover that covers the temperature detection element and the wiring pattern arranged on the first support portion, The stator includes a stator core including a yoke and teeth projecting radially from the yoke, an insulator having a tooth covering portion covering at least a portion of a surface of the teeth and fixed to the stator core, and a coil wound around the teeth via the first support portion, the cover, and the tooth covering portion. Electric work equipment.

11. A power supply line that supplies a drive current to the coil; a power line holder for holding the power line and the signal line; a screw for fixing the signal line and the insulator together, At least a portion of the wiring pattern is disposed on the insulator, the screw fixes the signal line and the insulator together in a state where the signal line is in contact with the wiring pattern. The electric operating machine according to claim 10.

12. a motor including a stator having a stator core with teeth, an insulator fixed to the stator core, and a coil wound around the teeth via the insulator, and a rotor that rotates about a rotation axis relative to the stator; an output section driven by the rotor; a support member disposed on the stator; a temperature detection element supported by the support member; a wiring pattern disposed on the support member and connected to the temperature detection element; a power supply line for supplying a driving current to the coil; a connection terminal connected to the power supply line; a signal line connected to the wiring pattern; a power line holder for holding the power line, the connection terminal, and the signal line; a first screw for fixing the connection terminal and the external terminal; a second screw for fixing the signal line and the insulator together, At least a portion of the wiring pattern is disposed on the insulator, the second screw fixes the signal line and the insulator together in a state where the signal line is in contact with the wiring pattern. Electric work equipment.

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