Electric tools, gardening tools or power tools

Abstract

To provide an electric work machine in which the heat of a coil can be dissipated.SOLUTION: An electric work machine includes: a stator including a stator core, an insulator fixed to the stator core, and a coil mounted on the insulator; a rotor at least part of which is disposed on the outer peripheral side of the stator, the rotor having a magnet; a stator base with a first heat dissipation fin, the stator base supporting the stator core; and an output part driven by the rotor.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to an electric work machine. [Background technology]

[0002] 2. Description of the Related Art In the technical field relating to electric working machines, an electric working machine equipped with an outer rotor type motor, such as that disclosed in Patent Document 1, is known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-093132 A Summary of the Invention [Problem to be solved by the invention]

[0004] The motor has a coil attached to an insulator. When a drive current is supplied to the coil, the coil generates heat. Therefore, there is a demand for a technology that can dissipate the heat from the coil.

[0005] The present disclosure is directed to dissipating heat in the coil. [Means for solving the problem]

[0006] According to the first disclosure, there is provided an electric working machine comprising: a stator having a stator core, an insulator fixed to the stator core, and a coil attached to the insulator; a rotor having a magnet and at least a portion of which is arranged on the outer periphery of the stator; a stator base having a first heat dissipation fin and supporting the stator core; and an output section driven by the rotor.

[0007] According to the second disclosure, there is provided an electric working machine comprising: a stator having a stator core, an insulator fixed to the stator core, and a coil attached to the insulator; a rotor having a magnet and at least a portion of which is arranged on the outer periphery of the stator; a stator base supporting the stator core; a first heat dissipation member made of metal facing the end face of the stator core; and an output section driven by the rotor. Effect of the Invention

[0008] According to the present disclosure, the heat of the coil is dissipated. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing an electric operating machine according to a first embodiment. [Diagram 2] FIG. 2 is an exploded perspective view showing the motor according to the first embodiment, as viewed from the left. [Diagram 3] FIG. 3 is a perspective view showing the rotor and the rotor shaft according to the first embodiment. [Figure 4] FIG. 4 is an exploded perspective view showing the rotor and the rotor shaft according to the first embodiment. [Diagram 5] FIG. 5 is a perspective view showing the stator and the stator base according to the first embodiment. [Figure 6] FIG. 6 is a plan view of the stator and the stator base according to the first embodiment as viewed from above. [Figure 7] FIG. 7 is a vertical cross-sectional view showing the stator and the stator base according to the first embodiment. [Figure 8] FIG. 8 is an exploded perspective view showing the stator and the stator base according to the first embodiment. [Figure 9] FIG. 9 is a perspective view showing a stator and a stator base according to the second embodiment. [Figure 10] FIG. 10 is a perspective view showing a stator and a stator base according to the second embodiment. [Figure 11]FIG. 11 is a perspective view showing a state in which the coils are removed from the stator and the stator base according to the second embodiment. [Figure 12] FIG. 12 is a perspective view showing a state in which the insulator and the coil are removed from the stator and the stator base according to the second embodiment. [Figure 13] FIG. 13 is an exploded perspective view showing a stator and a stator base according to the second embodiment. [Figure 14] FIG. 14 is a vertical cross-sectional view showing a stator and a stator base according to the second embodiment. [Figure 15] FIG. 15 is a perspective view showing a stator and a stator base according to the third embodiment. [Figure 16] FIG. 16 is an exploded perspective view showing a stator and a stator base according to the third embodiment. [Figure 17] FIG. 17 is a vertical cross-sectional view showing a stator and a stator base according to the third embodiment. [Figure 18] FIG. 18 is a perspective view showing a first stator base, a stator core, and an insulator according to the third embodiment. [Figure 19] FIG. 19 is a perspective view showing a stator and a stator base according to the fourth embodiment. [Figure 20] FIG. 20 is a cross-sectional view showing a stator and a stator base according to the fourth embodiment. [Figure 21] FIG. 21 is a vertical cross-sectional view showing a stator and a stator base according to the fourth embodiment. [Figure 22] FIG. 22 is a perspective view showing a stator and a stator base according to the fifth embodiment. [Diagram 23] FIG. 23 is a vertical cross-sectional view showing a stator and a stator base according to the fifth embodiment. [Figure 24] FIG. 24 is a perspective view showing a stator and a stator base according to the sixth embodiment. [Diagram 25] FIG. 25 is a vertical cross-sectional view showing a stator and a stator base according to the sixth embodiment. [Figure 26]FIG. 26 is a perspective view showing a stator and a stator base according to the seventh embodiment. [Figure 27] FIG. 27 is a vertical cross-sectional view showing a stator and a stator base according to the seventh embodiment. [Figure 28] FIG. 28 is a perspective view showing a stator and a stator base according to the eighth embodiment. [Figure 29] FIG. 29 is a cross-sectional view showing a stator and a stator base according to the ninth embodiment. [Diagram 30] FIG. 30 is a perspective view showing a stator and a stator base according to the tenth embodiment. [Diagram 31] FIG. 31 is a perspective view showing a stator and a stator base according to the eleventh embodiment. [Diagram 32] FIG. 32 is a cross-sectional view showing the stator and the stator base according to the eleventh embodiment. [Diagram 33] FIG. 33 is a perspective view showing a part of the stator and the stator base according to the twelfth embodiment. [Diagram 34] FIG. 34 is a vertical cross-sectional view showing a part of the stator and the stator base according to the twelfth embodiment. [Diagram 35] FIG. 35 is a perspective view showing a stator and a stator base according to the thirteenth embodiment. [Diagram 36] FIG. 36 is a vertical cross-sectional view showing a stator and a stator base according to the thirteenth embodiment. [Figure 37] FIG. 37 is an exploded perspective view showing the stator and the stator base according to the thirteenth embodiment. [Figure 38] FIG. 38 is a perspective view showing a portion of the first stator base and the insulator according to the thirteenth embodiment. [Figure 39] FIG. 39 is a diagram for explaining a method of manufacturing the stator according to the thirteenth embodiment. [Diagram 40] FIG. 40 is a perspective view showing a stator and a stator base according to the fourteenth embodiment. [Diagram 41]FIG. 41 is a vertical cross-sectional view showing a stator and a stator base according to the fourteenth embodiment. [Diagram 42] FIG. 42 is an exploded perspective view showing a stator and a stator base according to the fourteenth embodiment. [Diagram 43] FIG. 43 is a perspective view showing a portion of the stator core and the insulator according to the fourteenth embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment according to the present disclosure will be described with reference to the drawings, but the present disclosure is not limited to the embodiment. The components of the embodiments described below can be appropriately combined. In addition, some components may not be used.

[0011] 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.

[0012] The electric operating machine has a motor. In the embodiments, the radial direction of the rotation shaft AX of the motor is appropriately referred to as the radial direction. The direction parallel to the rotation shaft AX of the motor is appropriately referred to as the axial direction. The direction going around the rotation shaft AX of the motor is appropriately referred to as the circumferential direction or the rotation direction.

[0013] A position or direction closer to the motor's rotation shaft AX in the radial direction is referred to as the radially inner side, and a position or direction farther from the motor's rotation shaft AX in the radial direction is referred to as the radially outer side. A position or direction on one side in the axial direction is referred to as the one axial side, and a position or direction on the other axial side is referred to as the other axial side,. A position or direction on one side in the circumferential direction is referred to as the one circumferential side, and a position or direction on the other circumferential side is referred to as the other circumferential side, as appropriate.

[0014] [First embodiment] A first embodiment will be described below. Fig. 1 is a diagram showing an electric working machine 1 according to the present embodiment. In this embodiment, the electric working machine 1 is a lawnmower, which is a type of garden tool (outdoor power equipment).

[0015] As shown in FIG. 1, the electric work machine 1 includes a housing 2, wheels 3, a motor 4, a cutting blade 5, a cutting box 6, a handle 7, and a battery mounting portion 8.

[0016] The housing 2 accommodates a motor 4 and a cutting blade 5. The wheels 3, the motor 4, and the cutting blade 5 are each supported by the housing 2.

[0017] The wheels 3 rotate while in contact with the ground. The rotation of the wheels 3 enables the electric working machine 1 to move on the ground. Four wheels 3 are provided.

[0018] The motor 4 is a power source for the electric work machine 1. The motor 4 generates a torque that rotates the cutting blade 5. The motor 4 is disposed above the cutting blade 5.

[0019] The cutting blade 5 is connected to the motor 4. The cutting blade 5 is an output part of the electric work machine 1 driven by the motor 4. The cutting blade 5 rotates about the rotation axis AX of the motor 4 by the rotational force generated by the motor 4. The cutting blade 5 faces the ground. With the wheels 3 in contact with the ground, the cutting blade 5 rotates to cut grass growing on the ground. The grass cut by the cutting blade 5 is stored in the cutting box 6.

[0020] The handle 7 is held by the hand of a user of the electric working machine 1. The user can move the electric working machine 1 while holding the handle 7 in his / her hand.

[0021] A battery pack 9 is attached to the battery attachment section 8. The battery pack 9 is a power source for the electric work machine 1. The battery pack 9 is detachable from the battery attachment section 8. The battery pack 9 includes a secondary battery. In this embodiment, the battery pack 9 includes a rechargeable lithium-ion battery. When attached to the battery attachment section 8, the battery pack 9 is capable of supplying power to the electric work machine 1. The motor 4 is driven based on the drive current supplied from the battery pack 9.

[0022] 2 is an exploded perspective view showing the motor 4 according to this embodiment. In this embodiment, the motor 4 is an outer rotor type brushless motor.

[0023] As shown in FIG. 2, the motor 4 includes a rotor 10, a rotor shaft 20, a stator 30, a stator base 40, and a sensor board 50. The rotor 10 rotates relative to the stator 30. At least a portion of the rotor 10 is disposed on the outer circumferential side of the stator 30. The rotor shaft 20 is fixed to the rotor 10. The rotor 10 and the rotor shaft 20 rotate about a rotation axis AX. The stator base 40 supports the stator 30. The stator base 40 is fixed to the stator core 31. The cutting blade 5 is connected to the rotor shaft 20. The cutting blade 5 is driven by the rotor 10. The sensor board 50 supports a magnetic sensor that detects the rotation of the rotor 10.

[0024] In this embodiment, the rotation shaft AX of the motor 4 extends in the vertical direction. The axial direction and the vertical direction are parallel to each other. In the following description, one side in the axial direction will be referred to as the upper side, and the other side in the axial direction will be referred to as the lower side.

[0025] Fig. 3 is a perspective view showing the rotor 10 and the rotor shaft 20 according to this embodiment. Fig. 4 is an exploded perspective view showing the rotor 10 and the rotor shaft 20 according to this embodiment.

[0026] 2, 3, and 4, the rotor 10 has a rotor cup 11 and a magnet 12. The rotor cup 11 is made of a metal whose main component is iron. The magnet 12 is a permanent magnet.

[0027] The rotor cup 11 has a rotor yoke 13 , a rotor plate 14 , and radial ribs 15 .

[0028] The rotor yoke 13 is cylindrical. The rotor yoke 13 is disposed so as to surround the stator 30. The rotor yoke 13 is disposed around the rotation axis AX. The central axis of the rotor yoke 13 and the rotation axis AX coincide with each other. The rotor plate 14 is annular. The rotor plate 14 is disposed around the rotation axis AX. The central axis of the rotor plate 14 and the rotation axis AX coincide with each other. At least a portion of the rotor plate 14 faces the shaft end surface 21 of the rotor shaft 20. The shaft end surface 21 faces upward. The radial ribs 15 connect the rotor yoke 13 and the rotor plate 14. The radial ribs 15 extend radially outward from the rotor plate 14. A plurality of the radial ribs 15 are provided at intervals in the circumferential direction. The rotor yoke 13, the rotor plate 14, and the radial ribs 15 are integral with each other.

[0029] The magnets 12 are fixed to the rotor yoke 13. A plurality of magnets 12 are arranged in the circumferential direction. In this embodiment, 14 magnets 12 are provided. The N pole magnets 12 and the S pole magnets 12 are arranged alternately in the circumferential direction. In this embodiment, the magnets 12 are arranged inside the rotor yoke 13. The magnets 12 are fixed to the inner surface of the rotor yoke 13 by, for example, an adhesive.

[0030] The rotor shaft 20 extends in the axial direction. The central axis of the rotor shaft 20 coincides with the rotation axis AX. The rotor shaft 20 is fixed to the rotor 10 so that the central axis of the rotor shaft 20 coincides with the central axis of the rotor yoke 13. The rotor shaft 20 has a shaft protrusion 22 protruding upward from a shaft end face 21. The rotor plate 14 has a shaft opening 16 in which the shaft protrusion 22 is disposed. The shaft protrusion 22 is disposed in the shaft opening 16, thereby positioning the rotor 10 and the rotor shaft 20 in the radial direction. The shaft end face 21 around the shaft protrusion 22 comes into contact with the lower surface of the rotor plate 14, thereby positioning the rotor 10 and the rotor shaft 20 in the axial direction.

[0031] In this embodiment, the rotor 10 and the rotor shaft 20 are fixed together by rotor screws 23. A threaded hole 24 is formed in the shaft end face 21. A screw opening 17 is formed in the rotor plate 14. With the shaft protrusion 22 disposed in the shaft opening 16, the rotor screw 23 is inserted into the screw hole 24 via the screw opening 17. The threads of the rotor screw 23 and the thread grooves of the screw hole 24 are coupled together, thereby fixing the rotor 10 and the rotor shaft 20 together by the rotor screws 23. In this embodiment, the rotor 10 and the rotor shaft 20 are fixed together by three rotor screws 23.

[0032] Fig. 5 is a perspective view showing the stator 30 and the stator base 40 according to this embodiment. Fig. 6 is a plan view of the stator 30 and the stator base 40 according to this embodiment, as viewed from above. Fig. 7 is a vertical cross-sectional view showing the stator 30 and the stator base 40 according to this embodiment. Fig. 8 is an exploded perspective view showing the stator 30 and the stator base 40 according to this embodiment. The vertical cross-sectional view is a cross-sectional view including the rotation axis AX and parallel to the rotation axis AX.

[0033] The stator 30 includes a stator core 31 , an insulator 32 , and a coil 33 .

[0034] The stator core 31 is made of a metal whose main component is iron. The stator core 31 has a stator yoke 34 and teeth 35. The stator yoke 34 is cylindrical. The stator yoke 34 is arranged around the rotation axis AX. The central axis of the stator yoke 34 and the rotation axis AX coincide with each other. The teeth 35 protrude radially outward from the outer surface of the stator yoke 34. A plurality of the teeth 35 are provided at intervals in the circumferential direction. In this embodiment, twelve teeth 35 are provided. A slot 36 is formed between adjacent teeth 35.

[0035] The insulator 32 is made of synthetic resin. The insulator 32 is fixed to the stator core 31. The insulator 32 is molded integrally with the stator core 31. The insulator 32 is fixed to the stator core by, for example, insert molding.

[0036] The insulator 32 covers at least a portion of the surface of the stator core 31. The insulator 32 covers at least a portion of the end face of the stator yoke 34 facing in the axial direction. The end face of the stator yoke 34 includes an upper end face facing upward and a lower end face facing downward. The insulator 32 also covers the outer surface of the stator yoke 34 facing radially outward. The insulator 32 also covers at least a portion of the surface of the teeth 35.

[0037] The coils 33 are attached to the insulators 32. The coils 33 are wound around the teeth 35 via the insulators 32. The surfaces of the teeth 35 around which the coils 33 are wound are covered by the insulators 32. The outer surfaces of the teeth 35 facing radially outward are not covered by the insulators 32. The stator core 31 and the coils 33 are insulated by the insulators 32. A plurality of coils 33 are provided. In this embodiment, twelve coils 33 are provided.

[0038] The sensor board 50 is fixed to the insulator 32. The sensor board 50 supports a magnetic sensor that detects rotation of the rotor 10. The sensor board 50 is fixed to the insulator 32 so that the magnet 12 and the magnetic sensor face each other. The sensor board 50 is disposed radially outward of the coil 33.

[0039] The stator base 40 supports the stator core 31. The stator base 40 is made of aluminum. The stator base 40 has a pipe portion 41, a leg portion 42, a connecting rib portion 43, and heat dissipating fins 44 (first heat dissipating fins).

[0040] The pipe portion 41 is substantially cylindrical. The pipe portion 41 is disposed around the rotation axis AX. The central axis of the pipe portion 41 and the rotation axis AX coincide with each other.

[0041] At least a part of the pipe section 41 is disposed inside the stator core 31. The central axis of the pipe section 41 and the central axis of the stator yoke 34 coincide with each other. In this embodiment, the pipe section 41 includes an inner pipe section 411 and an outer pipe section 412. The outer pipe section 412 is disposed on the outer peripheral side of the inner pipe section 411. The inner pipe section 411 is disposed inside the outer pipe section 412. The inner pipe section 411 is cylindrical. The outer pipe section 412 includes a small diameter section 412A and a large diameter section 412B disposed below the small diameter section 412A. Each of the small diameter section 412A and the large diameter section 412B is cylindrical. The outer diameter of the large diameter section 412B is larger than the outer diameter of the small diameter section 412A. The central axis of the inner pipe section 411 coincides with the rotation axis AX. The central axis of the inner pipe section 411 coincides with the central axis of the outer pipe section 412. The stator core 31 is disposed around the small diameter portion 412A. The small diameter portion 412A is disposed inside the stator core 31. The large diameter portion 412B is disposed outside the stator core 31. The stator core 31 is fixed to the outer pipe portion 412. The stator base 40 is fixed to the stator 30 such that the central axis of the inner pipe portion 411 and the central axis of the stator yoke 34 coincide with each other.

[0042] The pipe portion 41 supports the rotor shaft 20 via a bearing 25. The rotor shaft 20 is disposed inside the inner pipe portion 411. In this embodiment, the rotor shaft 20 is supported by the inner pipe portion 411 via the bearing 25. The bearing 25 is disposed between the inner surface of the inner pipe portion 411 and the outer surface of the rotor shaft 20. The bearing 25 rotatably supports the rotor shaft 20. The bearing 25 includes an upper bearing 251 and a lower bearing 252 disposed below the upper bearing 251.

[0043] The foot 42 is disposed on the outside of the stator core 31. The foot 42 is annular. The foot 42 is plate-shaped. The central axis of the pipe portion 41 and the central axis of the foot 42 coincide with each other. The foot 42 is fixed to a fixed object. An example of the fixed object is the housing 2 that accommodates the motor 4. The motor 4 is fixed to the fixed object by fixing the foot 42 to the fixed object. The inner diameter of the foot 42 is larger than the outer diameter of the outer pipe portion 412. A screw opening 45 is provided in the foot 42. A screw (not shown) is arranged in the screw opening 45. The screw arranged in the screw opening 45 is coupled to a screw hole provided in the fixed object, thereby fixing the foot 42 to the fixed object.

[0044] The connection rib portion 43 connects the pipe portion 41 and the foot portion 42. The connection rib portion 43 extends radially outward from the outer surface of the outer pipe portion 412. A plurality of connection ribs 43 are provided at intervals in the circumferential direction. In this embodiment, four connection ribs 43 are provided. In this embodiment, the connection rib portion 43 connects the large diameter portion 412B of the outer pipe portion 412 and the foot portion 42. A radially inner end of the connection rib portion 43 is fixed to the outer surface of the large diameter portion 412B. A radially outer end of the connection rib portion 43 is fixed to the inner surface of the foot portion 42. The connection rib portion 43 connects the pipe portion 41 and the foot portion 42 such that the central axis of the pipe portion 41 and the central axis of the foot portion 42 coincide with each other.

[0045] The heat dissipating fins 44 include inner heat dissipating fins 441 provided on the pipe portion 41 and outer heat dissipating fins 442 provided on the foot portion 42 .

[0046] The inner heat dissipation fin 441 is provided between the inner pipe section 411 and the outer pipe section 412. The inner heat dissipation fin 441 extends radially outward from the outer surface of the inner pipe section 411. A plurality of inner heat dissipation fins 441 are provided at intervals in the circumferential direction. The inner heat dissipation fin 441 connects the inner pipe section 411 and the outer pipe section 412. The radially inner end of the inner heat dissipation fin 441 is fixed to the outer surface of the inner pipe section 411. The radially outer end of the inner heat dissipation fin 441 is fixed to the inner surface of the outer pipe section 412. The inner pipe section 411 and the outer pipe section 412 are fixed via the inner heat dissipation fin 441. An air passage 46 extending in the axial direction is formed between the inner heat dissipation fin 441, the inner pipe section 411, and the outer pipe section 412 that are adjacent to each other.

[0047] The outer heat dissipation fins 442 are disposed on the upper surface of the foot portion 42. The lower end of the outer heat dissipation fins 442 is fixed to the upper surface of the foot portion 42. The outer heat dissipation fins 442 extend upward from the upper surface of the foot portion 42. A plurality of the outer heat dissipation fins 442 are provided at intervals in the circumferential direction.

[0048] Next, the operation of the motor 4 will be described. In this embodiment, the motor 4 is a three-phase brushless motor. Each of the twelve coils 33 is assigned to one of the U (UV) phase, V (VW) phase, and W (WU) phase. The driving current supplied from the battery pack 9 to the motor 4 includes a U-phase driving current, a V-phase driving current, and a W-phase driving current. The driving current from the battery pack 9 is supplied to the coils 33 via a bus bar (not shown). When the driving current is supplied from the battery pack 9 to the coils 33, a rotating magnetic field is generated in the stator 30. When the rotating magnetic field is generated in the stator 30, the rotor 10 and the rotor shaft 20 rotate around the rotation axis AX.

[0049] When a driving current is supplied to the coil 33, the coil 33 generates heat. The heat of the coil 33 is transferred to the stator base 40 via the insulator 32 and the stator core 31. The stator base 40 has heat dissipation fins 44. The heat of the coil 33 is efficiently dissipated via the heat dissipation fins 44.

[0050] As described above, according to this embodiment, the stator base 40 fixed to the stator core 31 has the heat dissipation fins 44. The heat dissipation fins 44 increase the surface area of ​​the stator base 40. As a result, the heat of the coil 33 transferred to the stator base 40 via the insulator 32 and the stator core 31 is efficiently dissipated via the heat dissipation fins 44. Therefore, an excessive increase in the temperature of the coil 33 is suppressed.

[0051] The inner heat dissipation fins 441 are provided on the pipe portion 41. As a result, the heat of the coil transferred to the pipe portion 41 via the insulator 32 and the stator core 31 is efficiently dissipated via the inner heat dissipation fins 441.

[0052] The pipe section 41 includes an inner pipe section 411 and an outer pipe section 412 disposed on the outer circumferential side of the inner pipe section 411. The inner heat dissipation fins 441 are provided between the inner pipe section 411 and the outer pipe section 412. Heat of the coil 33 transferred to the outer pipe section 412 via the insulator 32 and the stator core 31 is efficiently dissipated via the inner heat dissipation fins 441. In addition, because the inner heat dissipation fins 441 are provided between the inner pipe section 411 and the outer pipe section 412, an increase in size of the stator base 40 is suppressed.

[0053] The outer heat dissipation fins 442 are provided on the foot portion 42. The outer diameter of the foot portion 42 is larger than the outer diameter of the pipe portion 41. The area of ​​the upper surface of the foot portion 42 is larger than the area of ​​the outer surface of the small diameter portion 412A. The heat of the coil 33 transferred to the foot portion 42 via the insulator 32, the stator core 31, the pipe portion 41, and the connecting rib portion 43 is efficiently dissipated via the foot portion 42 and the outer heat dissipation fins 442.

[0054] A fan may be fixed to rotor shaft 20. Rotation of rotor shaft 20 rotates the fan. Rotation of the fan causes air to flow around heat dissipation fins 44. For example, air flows through air passage 46, and air flows around inner heat dissipation fins 441, thereby improving the cooling efficiency of coil 33. Furthermore, air flows around outer heat dissipation fins 442, thereby improving the cooling efficiency of coil 33.

[0055] In the above-described embodiment, the rotor plate 14 does not necessarily have to be provided with the shaft opening 16. The rotor plate 14 and the rotor shaft 20 may be integral. Also, the radial ribs 15 may be omitted, and the peripheral edge of the rotor plate 14 and the rotor yoke 13 may be directly connected. This eliminates the need for an opening in the rotor cup 11, which is advantageous from the viewpoint of waterproofing.

[0056] [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 are denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0057] 9 and 10 are perspective views showing the stator 30 and the stator base 40 according to the present embodiment. FIG. 9 is a perspective view of the stator 30 and the stator base 40 from below, and FIG. 10 is a perspective view of the stator 30 and the stator base 40 from above. FIG. 11 is a perspective view showing the stator 30 and the stator base 40 according to the present embodiment with the coil 33 removed. FIG. 12 is a perspective view showing the stator 30 and the stator base 40 according to the present embodiment with the insulator 32 and the coil 33 removed. FIG. 13 is an exploded perspective view showing the stator 30 and the stator base 40 according to the present embodiment. FIG. 14 is a vertical cross-sectional view showing the stator 30 and the stator base 40 according to the present embodiment.

[0058] The stator base 40 has a pipe portion 41, a foot portion 42, and a connecting rib portion 43. In this embodiment, twelve connecting ribs 43 are provided. The connecting rib portion 43 includes an inner rib portion 431, an outer rib portion 432, and a bent portion 433 disposed between the inner rib portion 431 and the outer rib portion 432. The outer rib portion 432 is disposed radially outward from the inner rib portion 431. The inner rib portion 431 is disposed above the outer rib portion 432. That is, the distance between the inner rib portion 431 and the coil 33 in the axial direction is shorter than the distance between the outer rib portion 432 and the coil 33.

[0059] The components of the stator base 40 according to this embodiment, other than the connecting rib portion 43, are similar to those of the stator base 40 described in the above-mentioned first embodiment.

[0060] As in the above-described embodiment, the stator 30 has a stator core 31, an insulator 32 fixed to the stator core 31, and a coil 33 attached to the insulator 32. The stator core 31 has a cylindrical stator yoke 34 and teeth 35 that protrude radially outward from the stator yoke 34 and around which the coil 33 is wound via the insulator 32.

[0061] In this embodiment, the stator 30 has a heat dissipation member 60 (first heat dissipation member) facing an end face of the stator core 31 facing the axial direction.

[0062] The heat dissipation member 60 is plate-shaped. The heat dissipation member 60 has an annular portion 61 and a radiating portion 62 protruding radially outward from the annular portion 61. The annular portion 61 faces an end face of the stator yoke 34 facing the axial direction. The radiating portion 62 faces an end face of the teeth 35 facing the axial direction. The annular portion 61 contacts the end face of the stator yoke 34. The annular portion 61 is provided so as to contact the entire area of ​​the end face of the stator yoke 34. The radiating portion 62 contacts the end face of the teeth 35. A plurality of the radiating portions 62 are provided so as to contact each of the end faces of the plurality of teeth 35.

[0063] In this embodiment, the heat dissipation member 60 includes an upper heat dissipation member 601 in contact with the upper end surface of the stator core 31, and a lower heat dissipation member 602 in contact with the lower end surface of the stator core 31. Each of the upper heat dissipation member 601 and the lower heat dissipation member 602 has an annular portion 61 and a radiating portion 62. The lower surface of the upper heat dissipation member 601 contacts the upper end surface of the stator core 31. The upper surface of the lower heat dissipation member 602 contacts the lower end surface of the stator core 31.

[0064] The heat dissipation member 60 is made of metal. The heat dissipation member 60 has a higher thermal conductivity than the stator core 31. The heat dissipation member 60 has a higher thermal conductivity than the insulator 32.

[0065] In this embodiment, the heat dissipation member 60 is made of aluminum. As described above, the stator core 31 is made of steel whose main component is iron. The heat dissipation member 60 has a thermal conductivity of about 236 [W / (m·K)]. The heat dissipation member 60 may have a thermal conductivity of about 96 [W / (m·K)]. The heat conductivity of the stator core 31 is about 84 [W / (m·K)].

[0066] The upper heat dissipation member 601 has heat dissipation fins 63 (second heat dissipation fins). The heat dissipation fins 63 are provided on the annular portion 61 of the upper heat dissipation member 601. The heat dissipation fins 63 extend upward from the upper surface of the annular portion 61 of the upper heat dissipation member 601. A plurality of heat dissipation fins 63 are provided at intervals in the circumferential direction.

[0067] At least a portion of the heat dissipation member 60 is covered with the insulator 32. The insulator 32 is integrally molded with the heat dissipation member 60 and the stator core 31. The insulator 32 is fixed to the heat dissipation member 60 and the stator core 31 by, for example, insert molding.

[0068] In this embodiment, at least a portion of the radiation portion 62 is covered by the insulator 32. The annular portion 61 is not covered by the insulator 32.

[0069] The upper heat dissipation member 601 is integrally molded with the stator core 31. When the insulator 32 includes a fitted-in insulator that is fitted into the upper part of the stator core 31, the upper heat dissipation member 601 may be fixed to the stator core 31 by the fitted-in insulator. The upper heat dissipation member 601 contacts the stator base 40.

[0070] The lower heat dissipation member 602 is integrally molded with the stator core 31. When the insulator 32 includes a fitting-type insulator that is fitted into the lower part of the stator core 31, the lower heat dissipation member 602 may be fixed to the stator core 31 by the fitting-type insulator. The lower heat dissipation member 602 contacts the stator base 40.

[0071] The stator base 40 is molded integrally with the stator core 31. The legs 42 of the stator base 40 and the stator core 31 are molded integrally.

[0072] The upper heat dissipation member 601, the stator core 31, the lower heat dissipation member 602, and the stator base 40 are fixed together by stator screws 37. A screw opening 64 is formed in the annular portion 61 of the upper heat dissipation member 601. A screw opening 38 is formed in the stator core 31. The screw opening 38 in the stator core 31 is formed so as to penetrate through the upper end surface and the lower end surface of the stator yoke 34. A screw opening 65 is formed in the annular portion 61 of the lower heat dissipation member 602. A screw hole 47 is formed in the end surface facing upward of the large diameter portion 412B of the stator base 40.

[0073] The stator screw 37 is inserted into the screw opening 64 of the upper heat dissipation member 601 from the upper side of the upper heat dissipation member 601. The stator screw 37 is inserted into the screw hole 47 of the stator base 40 through the screw opening 64 of the upper heat dissipation member 601, the screw opening 38 of the stator core 31, and the screw opening 65 of the lower heat dissipation member 602. The threads of the stator screw 37 are coupled with the thread grooves of the screw hole 47, thereby fixing the upper heat dissipation member 601, the stator core 31, the lower heat dissipation member 602, and the stator base 40 together with the stator screw 37. In this embodiment, the upper heat dissipation member 601, the stator core 31, the lower heat dissipation member 602, and the stator base 40 together with the three stator screws 37.

[0074] In this embodiment, the lower bearing 252 is fixed to the inner pipe section 411 by a bearing fixing screw 26. A threaded boss 48 is provided at the lower end of the inner pipe section 411. The bearing fixing screw 26 is inserted into a threaded hole provided in the threaded boss 48. When the bearing fixing screw 26 is inserted into the threaded hole of the threaded boss 48 with the lower bearing 252 disposed inside the inner pipe section 411, the head of the bearing fixing screw 26 comes into contact with at least a part of the lower bearing 252. The contact between the head of the bearing fixing screw 26 and the lower bearing 252 fixes the lower bearing 252 to the inner pipe section 411.

[0075] Next, a manufacturing method of the stator 30 according to this embodiment will be described. The upper heat dissipation member 601, the stator core 31, and the lower heat dissipation member 602 are aligned so that the screw opening 64 of the upper heat dissipation member 601, the screw opening 38 of the stator core 31, and the screw opening 65 of the lower heat dissipation member 602 overlap. The size of the annular portion 61 and the size of the stator yoke 34 are equal in the radial direction. Therefore, by aligning the edge of the annular portion 61 with the edge of the end face of the stator yoke 34, the upper heat dissipation member 601, the stator core 31, and the lower heat dissipation member 602 are easily aligned in the radial direction so that the screw opening 64, the screw opening 38, and the screw opening 65 overlap. Also, the size of the radiation portion 62 and the size of the teeth 35 are equal in the circumferential direction. Therefore, by aligning the edge of the radiating portion 62 with the edge of the end face of the tooth 35, the upper heat dissipation member 601, the stator core 31, and the lower heat dissipation member 602 can be easily aligned circumferentially so that the screw openings 64, 38, and 65 overlap.

[0076] The stator core 31 and the heat dissipation member 60 (upper heat dissipation member 601 and lower heat dissipation member 602) are aligned, and with the heat dissipation member 60 in contact with an end face of the stator core 31, the stator core 31 and the heat dissipation member 60 are placed inside a metal mold for insert molding. After the stator core 31 and the heat dissipation member 60 are placed inside the metal mold, synthetic resin for forming the insulator 32 is injected into the metal mold. The synthetic resin injected into the metal mold covers at least a part of the surface of the stator core 31 and at least a part of the surface of the heat dissipation member 60. The heat dissipation member 60 is fixed to the stator core 31 by the synthetic resin injected into the metal mold. Furthermore, the insulator 32 is formed by injecting the synthetic resin into the metal mold.

[0077] Note that synthetic resin for forming the insulator 32 may be injected into the mold while the pins fixed to the inner surface of the mold are positioned in the screw openings 64, 38, and 65. By positioning the pins in the screw openings 64, 38, and 65, the mold, the stator core 31, and the heat dissipation member 60 (the upper heat dissipation member 601 and the lower heat dissipation member 602) are aligned.

[0078] As described above, according to this embodiment, the stator 30 has the metallic heat dissipation member 60 facing the end face of the stator core 31. At least a portion of the heat dissipation member 60 is covered by the insulator 32. The coil 33 is attached to the insulator 32. The heat of the coil 33 is transferred to the heat dissipation member 60 via the insulator 32. The heat of the coil 33 is efficiently dissipated via the heat dissipation member 60.

[0079] The thermal conductivity of the heat dissipation member 60 is higher than the thermal conductivity of the stator core 31. Since the heat dissipation member 60 has high thermal conductivity, the heat of the coil 33 is efficiently dissipated through the heat dissipation member 60.

[0080] At least a portion of the heat dissipation member 60 contacts the end face of the stator core 31. As a result, the heat transferred from the coil 33 to the heat dissipation member 60 is efficiently transferred to the stator core 31. Therefore, the heat of the coil 33 is efficiently dissipated via the heat dissipation member 60 and the stator core 31.

[0081] The heat dissipation member 60 has a radiation portion 62 that contacts the end face of the tooth 35. The coil 33 is wound around the radiation portion 62. Therefore, the heat of the coil 33 is transferred to the heat dissipation member 60 efficiently.

[0082] The radiation portion 62 of the heat dissipation member 60 is covered by the insulator 32. The annular portion 61 of the heat dissipation member 60 is not covered by the insulator 32. The annular portion 61 of the heat dissipation member 60 is arranged so as to be exposed to the outside of the insulator 32. Since the radiation portion 62 is covered by the insulator 32, the heat of the coil 33 is efficiently transferred to the radiation portion 62 via the insulator 32. The heat of the coil 33 transferred to the radiation portion 62 is transferred from the radiation portion 62 to the annular portion 61. Since the annular portion 61 is not covered by the insulator 32, the heat of the coil 33 is efficiently dissipated from the annular portion 61.

[0083] Heat dissipation fins 63 are provided on the annular portion 61. The heat dissipation fins 63 increase the surface area of ​​the annular portion 61. As a result, the heat of the coil 33 transferred to the annular portion 61 is efficiently dissipated via the heat dissipation fins 63.

[0084] In this embodiment, the end face of the stator core 31 and the heat dissipation member 60 do not need to be in contact with each other. For example, an adhesive layer for connecting the stator core 31 and the heat dissipation member 60 may be provided between the end face of the stator core 31 and the heat dissipation member 60.

[0085] [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 are denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0086] Fig. 15 is a perspective view showing the stator 30 and the stator base 40 according to the present embodiment. Fig. 16 is an exploded perspective view showing the stator 30 and the stator base 40 according to the present embodiment. Fig. 17 is a vertical cross-sectional view showing the stator 30 and the stator base 40 according to the present embodiment.

[0087] In this embodiment, the stator base 40 includes a first stator base 401 and a second stator base 402. The second stator base 402 is fixed to a fixed object. The first stator base and the second stator base are separate bodies. The first stator base 401 and the second stator base 402 are each made of aluminum. The first stator base 401 includes a portion corresponding to the inner pipe portion 411 described in the above embodiment, a portion corresponding to the small diameter portion 412A of the outer pipe portion 412, and an inner heat dissipation fin 441. The second stator base 402 includes a portion corresponding to the large diameter portion 412B of the outer pipe portion 412 described in the above embodiment, a foot portion 42, a connection rib portion 43, and an outer heat dissipation fin 442. The first stator base 401 is disposed inside the stator core 31. The second stator base 402 is disposed outside the stator core 31.

[0088] The lower heat dissipation member 602 is disposed on the lower end surface of the stator core 31. As described in the above-mentioned second embodiment, the lower heat dissipation member 602 has an annular portion 61 facing the lower end surface of the stator yoke 34 and a radiation portion 62 facing the lower end surfaces of the teeth 35.

[0089] In this embodiment, the first stator base 401 has an annular portion 66 facing the upper end surface of the stator yoke 34, and radial portions 67 protruding radially from the annular portion 66 and facing the upper end surfaces of the teeth 35. In this embodiment, the annular portion 66 contacts the upper end surface of the stator yoke 34. The radial portions 67 contact the upper end surfaces of the teeth 35.

[0090] At least a portion of the radiation portion 62 of the lower heat dissipation member 602 is covered by the insulator 32. At least a portion of the radiation portion 67 of the first stator base 401 is covered by the insulator 32. The insulator 32 is integrally molded with the stator core 31, the lower heat dissipation member 602, and the first stator base 401. The insulator 32 is fixed to the stator core 31, the lower heat dissipation member 602, and the first stator base 401 by, for example, insert molding.

[0091] The annular portion 61 of the lower heat dissipation member 602 is not covered by the insulator 32. The annular portion 66 of the first stator base 401 is not covered by the insulator 32.

[0092] In this embodiment, the heat dissipating fins 44 (first heat dissipating fins) include intermediate heat dissipating fins 443 provided on the first stator base 401. The intermediate heat dissipating fins 443 are provided on the upper surface of the annular portion 66 of the first stator base 401. The intermediate heat dissipating fins 443 extend upward from the upper surface of the annular portion 66 of the first stator base 401. A plurality of intermediate heat dissipating fins 443 are provided at intervals in the circumferential direction.

[0093] The first stator base 401, the stator core 31, the lower heat dissipation member 602, and the second stator base 402 are fixed together by stator screws 37. Screw openings 64C are formed in the annular portion 66 of the first stator base 401. Screw openings 38 are formed in the stator core 31. Screw openings 65 are formed in the annular portion 61 of the lower heat dissipation member 602. Screw holes 47C are formed in the end face of the large diameter portion 412B of the second stator base 402 facing upward.

[0094] The stator screw 37 is inserted into the screw opening 64C of the first stator base 401 from the upper side of the first stator base 401. The stator screw 37 is inserted into the screw hole 47C of the second stator base 402 through the screw opening 64C of the first stator base 401, the screw opening 38 of the stator core 31, and the screw opening 65 of the lower heat dissipation member 602. The threads of the stator screw 37 are coupled with the thread grooves of the screw hole 47C, thereby fixing the first stator base 401, the stator core 31, the lower heat dissipation member 602, and the second stator base 402 by the stator screw 37. In this embodiment, the first stator base 401, the stator core 31, the lower heat dissipation member 602, and the second stator base 402 are fixed by the three stator screws 37.

[0095] Fig. 18 is a perspective view showing a first stator base 401, a stator core 31, and an insulator 32 according to this embodiment. As shown in Fig. 18, the first stator base 401 is disposed inside the stator core 31. The first stator base 401 is separable from the second stator base 402. Therefore, by inserting the first stator base 401 into the inside of the stator core 31 from the upper side of the stator core 31, the annular portion 66 and the radiating portion 67 face the upper end surface of the stator core 31.

[0096] The coil 33 is wound around the teeth 35 via the insulators 32 by a coil winding machine (not shown). If the second stator base 402 is connected to the first stator base 401, it is difficult for the coil winding machine to smoothly wind the coil 33. By separating the second stator base 402 from the first stator base 401, the coil winding machine can wind the coil 33 around the insulators 32 that cover the teeth 35.

[0097] As described above, according to the present embodiment, at least a portion of the first stator base 401 is covered with the insulator 32. The heat of the coil 33 is transferred to the first stator base 401 through the insulator 32. The heat of the coil 33 is efficiently dissipated through the first stator base 401.

[0098] The first stator base 401 is made of aluminum. The thermal conductivity of the first stator base 401 is higher than the thermal conductivity of the stator core 31. Since the first stator base 401 has high thermal conductivity, the heat of the coil 33 is efficiently dissipated through the first stator base 401.

[0099] The first stator base 401 has an annular portion 66 facing the upper end surface of the stator yoke 34, and a radial portion 67 protruding radially outward from the annular portion 66 and facing the upper end surfaces of the teeth 35. The first stator base 401 is separable from the second stator base 402. Therefore, by inserting the first stator base 401 into the inside of the stator core 31 from above the stator core 31, the annular portion 66 and the radial portion 67 can face the upper end surface of the stator core 31.

[0100] At least a portion of the first stator base 401 contacts the upper end surface of the stator core 31. This allows the heat transferred from the coil 33 to the first stator base 401 to be efficiently transferred to the stator core 31. Therefore, the heat of the coil 33 is dissipated via the first stator base 401 and the stator core 31.

[0101] The radiation portion 67 of the first stator base 401 is covered by the insulator 32. The annular portion 66 of the first stator base 401 is not covered by the insulator 32. The annular portion 66 of the first stator base 401 is arranged so as to be exposed to the outside of the insulator 32. Since the radiation portion 67 is covered by the insulator 32, the heat of the coil 33 is efficiently transferred to the radiation portion 67 via the insulator 32. The heat of the coil 33 transferred to the radiation portion 67 is transferred from the radiation portion 67 to the annular portion 66. Since the annular portion 66 is not covered by the insulator 32, the heat of the coil 33 is efficiently dissipated from the annular portion 66.

[0102] Intermediate heat dissipation fins 443 are provided on the annular portion 66 of the first stator base 401. The intermediate heat dissipation fins 443 increase the surface area of ​​the annular portion 66. As a result, the heat of the coil 33 transferred to the annular portion 66 is efficiently dissipated via the intermediate heat dissipation fins 443.

[0103] In this embodiment, the annular portion 66 and the radiating portion 67 of the first stator base 401 do not have to be in contact with the upper end surface of the stator core 31. For example, an adhesive layer may be provided between the annular portion 66 and the radiating portion 67 of the first stator base 401 and the upper end surface of the stator core 31.

[0104] [Fourth embodiment] A fourth embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0105] Fig. 19 is a perspective view showing the stator 30 and the stator base 40 according to this embodiment. Fig. 20 is a cross-sectional view showing the stator 30 and the stator base 40 according to this embodiment. Fig. 21 is a cross-sectional view showing the stator 30 and the stator base 40 according to this embodiment. The cross-sectional view is a cross-sectional view perpendicular to the rotation axis AX, and corresponds to the cross-sectional view taken along the line AA in Fig. 19.

[0106] In this embodiment, the stator 30 has a resin portion 70 that covers the coils 33. The resin portion 70 is made of synthetic resin. The coils 33 are molded with synthetic resin.

[0107] The resin part 70 has high thermal conductivity and electrical insulation. For example, when the thermal conductivity of nylon resin is 0.2 [W / m·K], the thermal conductivity of the synthetic resin used for the resin part 70 is higher than 0.2 [W / m·K].

[0108] Examples of electrically insulating synthetic resins with thermal conductivity higher than 0.2 [W / m K] include Mitsubishi Engineering Plastics Corporation's Reny (registered trademark) products "XMT2001", "2547T", "4001TS", and "C5091TS". The thermal conductivity of these products at 30°C measured by thermal wave analysis (ISO 22007-3) is between 0.5 [W / (m K)] and 1.1 [W / (m K)].

[0109] Examples of electrically insulating synthetic resins with thermal conductivity higher than 0.2 [W / m K] include Novaduran (registered trademark) "TGN510" and "TGN515U" from Mitsubishi Engineering Plastics Corporation. The thermal conductivity of these resins at 23°C measured by the hot disk method (ISO 22007-2) is between 0.4 [W / (m K)] and 1.8 [W / (m K)].

[0110] The thermal conductivity of the resin part 70 at 25°C measured by the laser flash method is 0.5 [W / (m·K)] or more, and may be preferably 1 [W / (m·K)]. There is no particular upper limit to the thermal conductivity of the resin part 70, but the thermal conductivity of the resin part 70 at 25°C measured by the laser flash method may be 10 [W / (m·K)] or less, and may preferably be 5 [W / (m·K)] or less.

[0111] Examples of synthetic resins with thermal conductivity measured by the laser flash method of 1 [W / (m·K)] to 5 [W / (m·K)] include Unitika Ltd.'s Xecot (registered trademark) "PA6 base insulation type," "PA10 base insulation type," and "PA66 base insulation type." The thermal conductivity of these synthetic resins is 2 [W / (m·K)] to 5 [W / (m·K)] in the planar direction and 1 [W / (m·K)] to 1.5 [W / (m·K)] in the thickness direction.

[0112] The resin part 70 may be made of nylon resin containing an insulating thermally conductive filler. The resin part 70 may be made of polyphenylene sulfide (PPS) resin containing an insulating thermally conductive filler. Examples of the insulating thermally conductive filler include aluminum nitride filler and aluminum oxide filler. The content of the thermally conductive filler in the nylon resin or polyphenylene sulfide resin may be determined so that the thermal conductivity of the synthetic resin used in the resin part 70 is 1 [W / (m·K)] or more and 5 [W / (m·K)] or less.

[0113] As described above, according to this embodiment, the coil 33 is covered with the resin part 70, which has high thermal conductivity and electrical insulation. In this embodiment, the synthetic resin forming the resin part 70 has higher thermal conductivity than nylon resin. Since the thermal conductivity of the synthetic resin forming the resin part 70 is higher than that of nylon resin, the heat of the coil 33 is efficiently dissipated through the resin part 70. Furthermore, by covering the coil 33 with the resin part 70, the coil 33 is protected by the resin part 70. For example, the resin part 70 suppresses contact between the coil 33 and moisture or foreign matter.

[0114] The thermal conductivity of the resin part 70 measured by the laser flash method is preferably 1 [W / (m·K)] or more. When the thermal conductivity of the resin part 70 is 1 [W / (m·K)] or more, the resin part 70 can efficiently remove heat from the coil 33. In addition, the upper limit of the thermal conductivity of the resin part 70 measured by the laser flash method is not particularly limited, but may be 5 [W / (m·K)] or less.

[0115] [Fifth embodiment] A fifth embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0116] Fig. 22 is a perspective view showing the stator 30 and the stator base 40 according to this embodiment. Fig. 23 is a vertical cross-sectional view showing the stator 30 and the stator base 40 according to this embodiment.

[0117] As in the above-described fourth embodiment, the stator 30 has a resin portion 70 that covers the coil 33. In this embodiment, the resin portion 70 is connected to each of the stator base 40 and the stator core 31. The resin portion 70 contacts a part of the outer surface of the large diameter portion 412B of the exterior pipe portion 412. The resin portion 70 contacts an upper end surface of the small diameter portion 412A of the exterior pipe portion 412. The resin portion 70 contacts a part of the end surface of the stator core 31 facing the axial direction.

[0118] As described above, according to the present embodiment, the resin part 70 is connected to each of the stator base 40 and the stator core 31. The heat of the coil 33 is efficiently transferred to each of the stator base 40 and the stator core 31 via the resin part 70. The heat of the coil 33 is efficiently dissipated from the stator base 40 and the stator core 31.

[0119] [Sixth embodiment] A sixth 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 thereof will be simplified or omitted.

[0120] Fig. 24 is a perspective view showing the stator 30 and the stator base 40 according to this embodiment. Fig. 25 is a vertical cross-sectional view showing the stator 30 and the stator base 40 according to this embodiment.

[0121] Similar to the fourth and fifth embodiments described above, the stator 30 has a resin portion 70 that covers the coils 33 .

[0122] As in the second embodiment described above, the connecting rib portion 43 of the stator base 40 includes an inner rib portion 431, an outer rib portion 432, and a bent portion 433 disposed between the inner rib portion 431 and the outer rib portion 432. The outer rib portion 432 is disposed radially outward from the inner rib portion 431. The inner rib portion 431 is disposed above the outer rib portion 432. That is, the distance between the inner rib portion 431 and the coil 33 in the axial direction is shorter than the distance between the outer rib portion 432 and the coil 33.

[0123] The resin portion 70 is connected to the connecting rib portion 43 of the stator base 40. The resin portion 70 is connected to the inner rib portion 431.

[0124] As described above, according to the present embodiment, the resin part 70 is connected to the connecting rib part 43 of the stator base 40. The heat of the coil 33 is efficiently transferred to each of the connecting rib part 43 and the foot part 42 via the resin part 70. The heat of the coil 33 is efficiently dissipated from the connecting rib part 43 and the foot part 42.

[0125] Moreover, the resin portion 70 is disposed between the coil 33 and the inner rib portion 431 in the axial direction. This prevents the thickness of the resin portion 70 from becoming excessively large. The thickness of the resin portion 70 refers to the dimension of the resin portion 70 in the axial direction.

[0126] [Seventh embodiment] A seventh embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0127] Fig. 26 is a perspective view showing the stator 30 and the stator base 40 according to this embodiment. Fig. 27 is a vertical cross-sectional view showing the stator 30 and the stator base 40 according to this embodiment.

[0128] Similar to the fourth to sixth embodiments described above, the stator 30 has a resin portion 70 that covers the coils 33 .

[0129] In this embodiment, the stator 30 has a heat dissipation member 68 (second heat dissipation member) supported by the insulator 32. Note that the heat dissipation member 68 does not necessarily have to be supported by the insulator 32.

[0130] The heat dissipation member 68 is annular. The heat dissipation member 68 is plate-shaped. In this embodiment, the heat dissipation member 68 is supported on the upper end surface of the insulator 32. A portion of the lower surface of the heat dissipation member 68 is fixed to the upper end surface of the insulator 32. A portion of the lower surface of the heat dissipation member 68 faces the upper end surface of the coil 33.

[0131] The heat dissipation member 68 is made of metal. The heat conductivity of the heat dissipation member 68 is higher than that of the stator core 31. The heat conductivity of the heat dissipation member 68 is higher than that of the insulator 32. In this embodiment, the heat dissipation member 68 is made of aluminum.

[0132] The resin portion 70 is connected to the heat dissipation member 68. At least a portion of the resin portion 70 is disposed between the upper end surface of the coil 33 and the lower surface of the heat dissipation member 68. The resin portion 70 contacts both the coil 33 and the heat dissipation member 68. The resin portion 70 also covers at least a portion of the insulator 32. The resin portion 70 contacts at least a portion of the insulator 32.

[0133] As described above, according to this embodiment, the heat dissipation member 68 is supported by the insulator. At least a portion of the heat dissipation member 68 faces the coil 33. The resin part 70 covering the coil 33 is connected to the heat dissipation member 68. The heat of the coil 33 is efficiently transferred to the heat dissipation member 68 via the resin part 70. The heat of the coil 33 is efficiently dissipated from the heat dissipation member 68.

[0134] [Eighth embodiment] An eighth embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0135] FIG. 28 is a perspective view showing the stator 30 and the stator base 40 according to the present embodiment.

[0136] Similar to the fourth to seventh embodiments described above, the stator 30 has a resin portion 70 that covers the coil 33. Similar to the seventh embodiment described above, the stator 30 has a heat dissipation member 68 supported by the insulator 32.

[0137] In this embodiment, the heat dissipation member 68 has an annular plate portion 681 connected to each of the insulator 32 and the resin portion 70, and a heat dissipation fin portion 682 provided on the plate portion 681. The heat dissipation fin portion 682 extends upward from the upper surface of the plate portion 681. A plurality of heat dissipation fin portions 682 are provided at intervals in the circumferential direction.

[0138] As described above, according to the present embodiment, the heat dissipation member 68 is provided with the heat dissipation fin portion 682. The heat of the coil 33 is efficiently transferred to the heat dissipation member 68 via the resin portion 70. The heat of the coil 33 is efficiently dissipated from the heat dissipation member 68 having the heat dissipation fin portion 682.

[0139] [Ninth embodiment] A ninth embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0140] FIG. 29 is a cross-sectional view showing the stator 30 and the stator base 40 according to this embodiment.

[0141] Similar to the above-described fourth to eighth embodiments, the stator 30 has a resin portion 70 that covers the coils 33. Similar to the above-described first to eighth embodiments, the stator 30 has twelve coils 33. The coils 33 include a first coil 33A to a twelfth coil 33L.

[0142] The resin part 70 includes a first resin part 70A covering the first coil 33A and a second resin part 70B covering the second coil 33B adjacent to the first coil 33A. The resin part 70 also includes third resin part 70C to twelfth resin part 70L covering the third coil 33C to twelfth coil 33L, respectively.

[0143] A gap 71 is provided between the first resin portion 70A and the second resin portion 70B. The gap 71 is provided inside the slot 36. The gap 71 is formed to follow the shape of the slot 36.

[0144] Similarly, a gap 71 is formed between the second resin portion 70B and the third resin portion 70C. The same is true for the fourth resin portion 70D to the twelfth resin portion 70L.

[0145] As described above, in this embodiment, the resin portion 70 is disposed in a part of the slot 36. Air can flow through the gap 71 in the resin portion 70. The air flowing through the gap 71 removes the heat transferred from the coil 33 to the resin portion 70. Therefore, the heat of the coil 33 is efficiently dissipated.

[0146] [Tenth embodiment] A tenth 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 thereof will be simplified or omitted.

[0147] FIG. 30 is a perspective view showing the stator 30 and the stator base 40 according to the present embodiment.

[0148] As in the above-described fourth to ninth embodiments, the stator 30 has a resin portion 70 that covers the coil 33. In this embodiment, the resin portion 70 has a heat dissipation fin portion 72 that is disposed on an upper surface of the resin portion 70. The heat dissipation fin portion 72 extends upward from the upper surface of the resin portion 70. A plurality of heat dissipation fin portions 72 are provided at intervals in the circumferential direction.

[0149] As described above, in this embodiment, the heat dissipation fins 72 are provided on the resin portion 70. The heat of the coil 33 transferred to the resin portion 70 is dissipated from the heat dissipation fins 72 efficiently.

[0150] [Eleventh embodiment] An eleventh 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 thereof will be simplified or omitted.

[0151] Fig. 31 is a perspective view showing the stator 30 and the stator base 40 according to this embodiment. Fig. 32 is a cross-sectional view showing the stator 30 and the stator base 40 according to this embodiment.

[0152] Similar to the fourth to tenth embodiments described above, the stator 30 has a resin portion 70 that covers the coil 33. Similar to the ninth and tenth embodiments described above, the resin portion 70 has a gap 71. Similar to the seventh and eighth embodiments described above, the stator 30 has a heat dissipation member 68 (second heat dissipation member) supported by the insulator 32.

[0153] In this embodiment, the heat dissipation member 68 has an annular plate portion 681 supported by the insulator 32, a heat dissipation fin portion 682 provided on the plate portion 681, and a columnar rib portion 683 disposed in the gap 71 of the resin portion .

[0154] The plate portion 681 is connected to both the insulator 32 and the resin portion 70 .

[0155] The heat dissipation fin portion 682 extends upward from the upper surface of the plate portion 681. A plurality of heat dissipation fin portions 682 are provided at intervals in the circumferential direction.

[0156] The columnar rib portion 683 extends downward from the lower surface of the plate portion 681. The columnar rib portion 683 contacts the resin portion 70 while being disposed in the gap 71.

[0157] As described above, in this embodiment, the columnar rib portion 683 of the heat dissipation member 68 is disposed in the gap 71 of the resin portion 70. The heat of the coil 33 is transferred to the columnar rib portion 683 via the resin portion 70. The heat of the coil 33 transferred to the columnar rib portion 683 is transferred to the plate portion 681 and the heat dissipation fin portion 682. The heat of the coil 33 is transported by the columnar rib portion 683 to the plate portion 681 and the heat dissipation fin portion 682. The heat of the coil 33 is efficiently dissipated from the plate portion 681 and the heat dissipation fin portion 682.

[0158] [Twelfth embodiment] A twelfth embodiment will be described below. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof will be simplified or omitted.

[0159] Fig. 33 is a perspective view showing a portion of the stator 30 and the stator base 40 according to this embodiment. Fig. 34 is a vertical cross-sectional view showing a portion of the stator 30 and the stator base 40 according to this embodiment. The stator base 40 according to this embodiment includes the first stator base 401 and the second stator base 402 described in the above third embodiment. Each of Fig. 33 and Fig. 34 corresponds to a view in which the second stator base 402 is omitted.

[0160] As in the above-described fourth to eleventh embodiments, the stator 30 has a resin portion 70 that covers the coil 33. The first stator base 401 is disposed inside the stator core 31.

[0161] The first stator base 401 has an annular portion 66, a radiating portion 67, and intermediate heat dissipation fins 443. The annular portion 66 faces an upper end surface of the stator yoke 34. The radiating portion 67 protrudes radially from the annular portion 66. The radiating portion 67 faces upper end surfaces of the teeth 35. The intermediate heat dissipation fins 443 are provided on the upper surface of the annular portion 66.

[0162] The resin portion 70 is connected to at least a portion of the first stator base 401. The upper surface of the resin portion 70 is disposed so as to surround the upper surface of the annular portion 66. At least a portion of the resin portion 70 is in contact with the annular portion 66.

[0163] A lower heat dissipation member 602 is disposed on the lower end surface of the stator core 31. The lower heat dissipation member 602 has an annular portion 61 and a radiating portion 62. The annular portion 61 faces the lower end surface of the stator yoke 34. The radiating portion 62 faces the lower end surfaces of the teeth 35. The resin portion 70 contacts at least a portion of the lower heat dissipation member 602.

[0164] As described above, according to this embodiment, the heat of the coil 33 is transferred to the first stator base 401 via the resin part 70. The heat of the coil 33 is efficiently dissipated from the first stator base 401. The heat of the coil 33 is also transferred to the lower heat dissipation member 602 via the resin part 70. The heat of the coil 33 is efficiently dissipated from the lower heat dissipation member 602.

[0165] The first stator base 401 is separable from the second stator base 402. Therefore, in a state in which the first stator base 401 is separated from the second stator base 402, the process of molding the synthetic resin around the coil 33 can be smoothly performed.

[0166] [Thirteenth embodiment] A thirteenth embodiment will be described. 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 thereof will be simplified or omitted.

[0167] Fig. 35 is a perspective view showing the stator 30 and the stator base 40 according to this embodiment. Fig. 36 is a vertical cross-sectional view showing the stator 30 and the stator base 40 according to this embodiment. Fig. 37 is an exploded perspective view showing the stator 30 and the stator base 40 according to this embodiment.

[0168] As in the above-described third and twelfth embodiments, the stator base 40 according to this embodiment includes a first stator base 401 and a second stator base 402. Each of Fig. 35, Fig. 36, and Fig. 37 corresponds to a diagram in which the second stator base 402 is omitted.

[0169] As in the above-described fourth to twelfth embodiments, the stator 30 has a resin portion 70 that covers the coil 33. The first stator base 401 is disposed inside the stator core 31. The first stator base 401 has an annular portion 66 facing the upper end surface of the stator yoke 34 and a radiating portion 67 facing the upper end surfaces of the teeth 35.

[0170] As in the above embodiment, at least a portion of the surface of the stator core 31 is covered with the insulator 32. The sensor board 50 is fixed to the insulator 32 by a sensor screw 52.

[0171] 38 is a perspective view showing a first stator base 401 and a part of the insulator 32 according to this embodiment. As shown in FIG. 38, a cutout portion 32N is provided in a part of the insulator 32. The lower surface of the radiation portion 67 faces the upper end surface of the tooth 35. The cutout portion 32N and at least a part of the radiation portion 67 overlap. At least a part of the upper surface of the radiation portion 67 is not covered by the insulator 32.

[0172] FIG. 39 is a diagram for explaining a manufacturing method of the stator 30 according to the present embodiment. The first stator base 401 is disposed inside the stator core 31, and the radiating portion 67 faces the upper end surface of the tooth 35. The first stator base 401 and the stator core 31 are disposed inside a metal mold for insert molding. After the first stator base 401 and the stator core 31 are disposed inside the metal mold, a synthetic resin for forming the insulator 32 is injected into the metal mold. The synthetic resin injected into the metal mold covers at least a part of the surface of the first stator base 401 and at least a part of the surface of the stator core 31. The first stator base 401 is fixed to the stator core 31 by the synthetic resin injected into the metal mold. The insulator 32 is formed by injecting the synthetic resin into the metal mold.

[0173] 39(A), synthetic resin is injected into the inside of a mold so as to form a notch 32N in the insulator 32. At least a part of the upper surface of the radiation portion 67 is not covered by the insulator 32.

[0174] 39(B), the coil 33 is wound around the teeth 35 via the insulator 32 by a coil winding machine (not shown). At least a portion of the coil 33 contacts the insulator 32. In this embodiment, since the insulator 32 has the cutout portion 32N, a space 32S is formed between the coil 33, the radiation portion 67, and the insulator 32.

[0175] 39(C), synthetic resin is molded to cover the coil 33, forming the resin portion 70. At least a portion of the resin portion 70 is disposed in the space 32S. The resin portion 70 is disposed between the coil 33 and the teeth 35. In this embodiment, the resin portion 70 is disposed between the coil 33 and the radiation portion 67 in contact with the teeth 35. The resin portion 70 disposed in the space 32S contacts each of the coil 33, the radiation portion 67, and the insulator 32.

[0176] As described above, according to this embodiment, the cutout portion 32N is formed in the insulator 32. The resin portion 70 is disposed in the space 32S formed by the cutout portion 32N. The resin portion 70 is disposed between the coil 33 and the teeth 35. The heat of the coil 33 is transferred to the first stator base 401 via the resin portion 70 disposed in the space 32S. The heat of the coil 33 is efficiently dissipated from the first stator base 401.

[0177] In this embodiment, at least a part of the lower surface of the radiation portion 62 of the lower heat dissipation member 602 is not covered by the insulator 32. A space is also formed between the coil 33, the radiation portion 62, and the insulator 32. A resin portion 70 is also arranged in the space between the coil 33, the radiation portion 62, and the insulator 32. The resin portion 70 arranged in the space between the coil 33, the radiation portion 62, and the insulator 32 contacts each of the coil 33, the radiation portion 62, and the insulator 32. The heat of the coil 33 is transferred to the lower heat dissipation member 602 via the resin portion 70 arranged in the space between the coil 33, the radiation portion 62, and the insulator 32. The heat of the coil 33 is efficiently dissipated from the lower heat dissipation member 602.

[0178] [Fourteenth embodiment] A fourteenth 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 thereof will be simplified or omitted.

[0179] Fig. 40 is a perspective view showing the stator 30 and the stator base 40 according to the present embodiment. Fig. 41 is a vertical cross-sectional view showing the stator 30 and the stator base 40 according to the present embodiment. Fig. 42 is an exploded perspective view showing the stator 30 and the stator base 40 according to the present embodiment.

[0180] As in the above-described third, twelfth, and thirteenth embodiments, the stator base 40 according to this embodiment includes a first stator base 401 and a second stator base 402. Each of Fig. 40, Fig. 41, and Fig. 42 corresponds to a diagram in which the second stator base 402 is omitted.

[0181] As in the fourth to thirteenth embodiments described above, the stator 30 has a resin portion 70 that covers the coil 33. The first stator base 401 is disposed inside the stator core 31.

[0182] In this embodiment, the insulator 32 includes an upper insulator 321 (first insulator) fixed to an upper portion of the stator core 31, and a lower insulator 322 (second insulator) fixed to a lower portion of the stator core 31. The upper insulator 321 is attached to the stator core 31 from above the stator core 31. The lower insulator 322 is attached to the stator core 31 from below the stator core 31.

[0183] FIG. 43 is a perspective view showing a portion of the stator core 31 and the insulator 32 according to this embodiment. In this embodiment, at least a portion of the resin portion 70 is disposed between the upper insulator 321 and the lower insulator 322. In this embodiment, a region 31N that is not covered by the insulator 32 is formed on the surface of the stator core 31. The region 31N is provided between the upper insulator 321 and the lower insulator 322 in the axial direction. The region 31N is provided on a portion of the surface of the tooth 35. The resin portion 70 is disposed so as to cover the region 31N on the surface of the stator core 31. The resin portion 70 contacts the region 31N of the stator core 31. The coil 33 contacts the resin portion 70 disposed in the region 31N. The resin portion 70 is disposed between the coil 33 and the tooth 35.

[0184] As described above, according to this embodiment, a region 31N that is not covered by the insulator 32 is formed on the surface of the stator core 31. The resin portion 70 is disposed in the region 31N. The resin portion 70 is disposed between the coil 33 and the teeth 35. The heat of the coil 33 is transferred to the stator core 31 via the resin portion 70 disposed in the region 31N on the surface of the teeth 35. The heat of the coil 33 transferred to the stator core 31 is transferred to each of the first stator base 401 and the lower heat dissipation member 602. The heat of the coil 33 is efficiently dissipated from the first stator base 401 and the lower heat dissipation member 602.

[0185] In the resin part 70 according to the above embodiment, the thermal conductivity for which the measurement method is not specified is the thermal conductivity measured by at least one of the following measurement methods: the laser flash method, the thermal wave analysis method (ISO 22007-3), and the hot disk method (ISO 22007-2).

[0186] [Other embodiments] In the above embodiment, the electric working machine 1 is a lawnmower, which is a type of gardening tool. The gardening tool is not limited to a lawnmower. Examples of gardening tools include a hedge trimmer, a chainsaw, a grass cutter, and a blower. The electric working machine 1 may also be an electric tool. Examples of electric tools include a driver drill, a vibration driver drill, an angle drill, an impact driver, a grinder, a hammer, a hammer drill, a circular saw, and a reciprocating saw.

[0187] In the above-described embodiment, the battery pack attached to the battery attachment portion is used as the power source for the electric operating machine. A commercial power source (AC power source) may also be used as the power source for the electric operating machine. [Explanation of symbols]

[0188] 1...electrical work machine, 2...housing, 3...wheel, 4...motor, 5...cutting blade, 6...cutting box, 7...handle, 8...battery mounting section, 9...battery pack, 10...rotor, 11...rotor cup, 12...magnet, 13...rotor yoke, 14...rotor plate, 15...radial rib, 16...shaft opening, 17...screw opening, 20...rotor shaft, 21...shaft end face, 22...shaft protrusion, 23...rotor screw, 24...screw hole, 25...bearing, 26...bearing 3, the stator core 31N has a region 32N isolator 32S has a space 33C isolator 34 has a stator yoke 35 has teeth 36 has slots 37 has stator screws 38 has screw openings 40 has stator base 41 has pipes 411 has inner pipes 412 has outer pipes 412A has small diameters 412B has large diameters 42 has legs 43 has connecting ribs 44 has heat dissipation fins (first heat dissipation fins) 45 ...screw opening, 46...ventilation path, 47...screw hole, 47C...screw hole, 48...screw boss, 50...sensor board, 52...sensor screw, 60...heat dissipation member (first heat dissipation member), 61...ring portion, 62...radiation portion, 63...heat dissipation fin (second heat dissipation fin), 64...screw opening, 64C...screw opening, 65...screw opening, 66...ring portion, 67...radiation portion, 68...heat dissipation member (second heat dissipation member), 70...resin portion, 71...gap, 72...heat dissipation fin portion, 251...upper bearing, 252...lower bearing 201...upper insulator (first insulator), 321...upper insulator (first insulator), 322...lower insulator (second insulator), 401...first stator base, 402...second stator base, 431...inner rib portion, 432...outer rib portion, 433...bent portion, 441...inner heat dissipation fin, 442...outer heat dissipation fin, 443...intermediate heat dissipation fin, 601...upper heat dissipation member, 602...lower heat dissipation member, 681...plate portion, 682...heat dissipation fin portion, 683...columnar rib portion, AX...rotating axis.

Claims

1. An electric work machine which is a gardening tool or a power tool, an outer rotor type brushless motor including a stator having a stator core, an insulator fixed to the stator core, and a coil attached to the insulator, a rotor having a magnet at least a portion of which is disposed on the outer periphery side of the stator, and a rotor shaft fixed to the rotor; a housing that accommodates the brushless motor; a stator base having first heat dissipation fins and supported by the stator core; a sensor substrate fixed to the insulator, supporting a magnetic sensor that detects rotation of the rotor, and disposed radially outward of the coil; an output section driven by the rotor, the stator base includes a pipe portion, at least a portion of which is disposed inside the stator core and which supports the rotor shaft via a bearing, a foot portion, which is disposed outside the stator core and has a screw opening to be fixed to the housing which is an object to be fixed, and a connecting rib portion which connects the pipe portion and the foot portion; the pipe portion includes an inner pipe portion that supports the rotor shaft via the bearing, and an outer pipe portion that is disposed on an outer circumferential side of the inner pipe portion and fixed to the stator core, The first heat dissipation fin is provided between the inner pipe portion and the outer pipe portion and is provided on the foot portion. Electric work equipment.

2. the stator base includes a first stator base disposed inside the stator core and a second stator base disposed outside the stator core, The second stator base is fixed to a fixed object. The electric operating machine according to claim 1.

3. the stator core includes a cylindrical stator yoke and teeth protruding radially outward from the stator yoke and around which the coil is wound via the insulator; the stator base has an annular portion facing an end surface of the stator yoke, and a radial portion protruding from the annular portion radially outwardly of a rotation shaft of the rotor and facing an end surface of the teeth, At least a portion of the radiation portion is covered by the insulator. The electric operating machine according to claim 1 or 2.

4. a first heat dissipation member made of metal facing an end surface of the stator core; The electric operating machine according to any one of claims 1 to 3.

5. An electric work machine which is a gardening tool or a power tool, an outer rotor type brushless motor including a stator having a stator core, an insulator fixed to the stator core, and a coil attached to the insulator, and a rotor having a magnet, at least a portion of which is disposed on the outer periphery side of the stator; a stator base supporting the stator core; a sensor substrate fixed to the insulator, supporting a magnetic sensor that detects rotation of the rotor, and disposed radially outward of the coil; a first heat dissipation member made of metal, at least a portion of which is in contact with an end surface of the stator core; an output section driven by the rotor, the stator core includes a cylindrical stator yoke and teeth protruding radially outward from the stator yoke and around which the coil is wound via the insulator; the first heat dissipation member has an annular portion facing an end surface of the stator yoke, and a radiating portion protruding from the annular portion radially outward of a rotation shaft of the rotor and facing an end surface of the tooth, At least a portion of the radiation portion is covered by the insulator. Electric work equipment.

6. The thermal conductivity of the first heat dissipation member is higher than the thermal conductivity of the stator core. The electric operating machine according to claim 5.

7. The first heat dissipation member has a second heat dissipation fin provided on the annular portion. The electric operating machine according to claim 5.

8. A resin portion covering the coil is provided. The thermal conductivity of the resin part measured by a laser flash method is 1 [W / (m K)] or more and 5 [W / (m K)] or less. The electric operating machine according to any one of claims 1 to 7.

9. The resin portion is connected to each of the stator base and the stator core. The electric operating machine according to claim 8.

10. a second heat dissipation member supported by the insulator, The resin portion is connected to the second heat dissipation member. The electric operating machine according to claim 8 or 9.

11. The second heat dissipation member includes an annular plate portion connected to the insulator and the resin portion, and a heat dissipation fin portion provided on the plate portion. The electric operating machine according to claim 10.

12. the resin portion includes a first resin portion covering a first coil and a second resin portion covering a second coil adjacent to the first coil, A gap is provided between the first resin part and the second resin part. The electric operating machine according to claim 10 or 11.

13. The second heat dissipation member has a columnar rib portion disposed in the gap. The electric operating machine according to claim 12.

14. the stator core includes a cylindrical stator yoke and teeth protruding radially outward from the stator yoke and around which the coil is wound via the insulator; the insulator includes a first insulator fixed to a first portion of the stator core and a second insulator fixed to a second portion of the stator core, At least a portion of the resin portion is disposed between the first insulator and the second insulator. The electric operating machine according to any one of claims 8 to 13.

15. A stator having a stator core, an insulator fixed to the stator core, and a coil attached to the insulator; a rotor having a magnet, at least a portion of which is disposed on an outer circumferential side of the stator; an output section driven by the rotor; a stator base including a cylindrical portion supporting the stator core from an inner peripheral side, a plurality of radiating portions extending radially outward from the cylindrical portion, a ring portion connecting the radiating portions on an outer peripheral side, and a first heat dissipation fin extending from the ring portion, Garden tools or power tools.

16. The ring portion is provided with an opening for a screw, The screw opening is sandwiched between the first heat dissipation fins in a circumferential direction.

16. A gardening or power tool according to claim 15.

17. The magnet is supported from the outer periphery by a rotor yoke, The rotor yoke faces the first heat dissipation fin in a radial direction.

16. A gardening or power tool according to claim 15.

18. A stator having a stator core, an insulator fixed to the stator core, and a coil attached to the insulator; a rotor having a magnet, at least a portion of which is disposed on an outer circumferential side of the stator; a stator base having a cylindrical portion that supports the stator core from the inside; an output section driven by the rotor; a first heat dissipation member made of metal, the first heat dissipation member facing an end surface of the stator core, radially inside the coil, and placed on the cylindrical portion, Garden tools or power tools.

19. The first heat dissipation member is screwed to the cylindrical portion by a screw, The screw is disposed radially inward from the coil.

19. A garden tool or power tool according to claim 18.

Images