Electric working machine

Abstract

The electric working machine has a motor and an output shaft, wherein the motor has a stator and a rotor, wherein the rotor is arranged inside the stator and can rotate around a rotation axis; the output shaft is used to mount a top tool and is driven according to power transmitted from the motor. The stator has a stator core, a coil, and a welding terminal, wherein the coil is wound around at least a portion of the stator core; and the welding terminal is arranged radially inward of the coil and connected to the coil.

Description

Technical Field

[0001] The invention relates to an electric working machine. Background Art

[0002] In the technical field related to electric working machines, an electric tool including a brushless motor as disclosed in Patent Document 1 is known.

[0003] [Prior art literature]

[0004] [Patent Document]

[0005] Patent Document 1: Japanese Patent Publication No. 2015-056953 Summary of the invention

[0006] [Technical problem to be solved by the invention]

[0007] It is desirable to miniaturize an electric working machine. To miniaturize an electric working machine, it is necessary to miniaturize the motor.

[0008] An object of the present invention is to reduce the size of an electric working machine.

[0009] [Technical solutions for solving technical problems]

[0010] According to the present invention, there is provided an electric working machine, which has a motor and an output shaft, wherein the motor has a stator and a rotor, wherein the rotor is arranged on the inner side of the stator and can rotate around a rotation axis; the output shaft is used to mount a top tool and is driven according to power transmitted from the motor, wherein the stator has a stator core, a coil and a welding terminal, wherein the coil is wound around at least a portion of the stator core; and the welding terminal is arranged at a radially inner side than the coil and is connected to the coil.

[0011] [Effects of the invention]

[0012] According to the present invention, it is possible to reduce the size of the electric working machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a side view showing the electric power tool according to the embodiment.

[0014] Figure 2 This is a perspective view showing a stator according to the embodiment as viewed from one axial side.

[0015] Figure 3 This is a perspective view showing the stator according to the embodiment as seen from the other axial side.

[0016] Figure 4 It is a side view showing the stator according to the embodiment.

[0017] Figure 5 It is an exploded perspective view showing a stator according to the embodiment.

[0018] Figure 6 It is a perspective view showing the inner member according to the embodiment.

[0019] Figure 7 It is an exploded perspective view showing the inner member according to the embodiment.

[0020] Figure 8 It is a perspective view showing a core member according to the embodiment.

[0021] Fig. 9 It is a perspective view showing a part of the inner insulator according to the embodiment.

[0022] Fig.10 It is a perspective view showing an outer member according to the embodiment.

[0023] Fig.11 It is an exploded perspective view showing the outer member according to the embodiment.

[0024] Fig.12 This is a perspective view showing the coil unit according to the embodiment as seen from above.

[0025] Fig.13 This is a perspective view showing the coil unit according to the embodiment as seen from below.

[0026] Fig.14 It is a perspective view showing a terminal unit according to the embodiment.

[0027] Fig.15 It is a side view showing the terminal unit involved in the embodiment.

[0028] Fig.16 It is a perspective view showing the internal structure of the terminal unit involved in the embodiment.

[0029] Fig.17 It is a perspective exploded view showing a terminal unit according to the embodiment.

[0030] Fig.18 It is a perspective view showing a welding terminal according to the embodiment.

[0031] Fig.19 It is a perspective view showing the relationship between the coil and the welding terminal according to the embodiment.

[0032] Fig. 20 It is a diagram schematically showing an example of a flow state of a driving current according to an embodiment.

[0033] Fig.21 It is a diagram schematically showing an example of a flow state of a driving current according to an embodiment.

[0034] Fig. 22 It is a diagram schematically showing an example of a flow state of a driving current according to an embodiment.

[0035] Fig.23 It is a figure for demonstrating the assembly method of the stator which concerns on embodiment.

[0036] Fig.24 It is a figure for demonstrating the assembly method of the stator which concerns on embodiment.

[0037] Fig.25 It is a figure for demonstrating the assembly method of the stator which concerns on embodiment.

[0038] Fig.26 It is a figure for demonstrating the assembly method of the stator which concerns on embodiment.

[0039] Fig. 27 It is a figure for demonstrating the assembly method of the stator which concerns on embodiment. DETAILED DESCRIPTION

[0040] Next, refer to the attached Figure 1 While the embodiments of the present invention are described, the present invention is not limited thereto. The constituent elements of the embodiments described below can be appropriately combined. In addition, some of the constituent elements may not be used.

[0041] In the embodiments, the terms left, right, front, rear, top, and bottom are used to describe the positional relationship of each part. These terms represent relative positions or directions with respect to the center of the electric working machine. The electric working machine includes an electric tool having a motor.

[0042] In the embodiment, the direction parallel to the rotation axis AX of the motor is appropriately referred to as the axial direction, the radial direction of the rotation axis AX of the motor is appropriately referred to as the radial direction, and the direction surrounding the rotation axis AX of the motor is appropriately referred to as the circumferential direction or the rotation direction. In addition, in the radial direction, the position close to the rotation axis AX of the motor or the direction close to it is appropriately referred to as the radial inner side, and the position away from the rotation axis AX of the motor or the direction separated therefrom is appropriately referred to as the radial outer side.

[0043] [Power Tools]

[0044] Figure 1 1 is a side view of an electric tool 1 according to an embodiment. In the embodiment, the electric tool 1 is a vibration screwdriver electric drill. Figure 1As shown, the electric tool 1 has a handle housing 2, a main body housing 3, an output shaft 6 and a battery mounting portion 7, wherein the main body housing 3 is arranged above the handle housing 2 for accommodating a motor 8 and a power transmission mechanism 10; the output shaft 6 protrudes forward from the main body housing 3; and the battery mounting portion 7 is arranged at the lower portion of the handle housing 2.

[0045] The handle housing 2 is gripped by the operator. The handle housing 2 protrudes downward from the lower portion of the main body housing 3. The handle housing 2 is made of synthetic resin.

[0046] The main body case 3 includes a motor case 4 and a gear case 5, wherein the gear case 5 is arranged in front of the motor case 4. An output shaft 6 protrudes forward from the gear case 5.

[0047] The motor housing 4 is used to accommodate the motor 8. The motor housing 4 is cylindrical. The motor 8 is arranged in the internal space of the motor housing 4. The motor housing 4 is integrated with the handle housing 2. The motor housing 4 is made of synthetic resin. A rear cover 9 is arranged at the rear of the motor housing 4. The rear cover 9 is used to cover the opening at the rear of the motor housing 4. The rear cover 9 is made of synthetic resin.

[0048] The motor housing 4 has an air inlet 3A. The rear cover 9 has an exhaust port 3B. The exhaust port 3B is provided at the rear of the air inlet 3A. The air inlet 3A is used to connect the internal space of the main body housing 3 with the external space. The exhaust port 3B is used to connect the internal space of the main body housing 3 with the external space. The air inlet 3A is provided at the left and right parts of the motor housing 4, respectively. The exhaust port 3B is provided at the left and right parts of the rear cover 9, respectively. The air in the external space of the main body housing 3 flows into the internal space of the main body housing 3 through the air inlet 3A. The air in the internal space of the main body housing 3 flows out to the external space of the main body housing 3 through the exhaust port 3B.

[0049] The gear housing 5 is used to house a power transmission mechanism 10 including a plurality of gears. The gear housing 5 is cylindrical. The power transmission mechanism 10 is arranged in the internal space of the gear housing 5. The gear housing 5 is made of aluminum.

[0050] The output shaft 6 can be mounted with a top tool. A top tool such as a drill is mounted on the output shaft 6. The output shaft 6 includes a main shaft and a chuck. The main shaft is rotated by the power generated by the motor 8, and the chuck can hold the top tool.

[0051] The battery mounting portion 7 is connected to the battery pack 11. The battery mounting portion 7 is provided at the lower portion of the handle housing 2. The battery pack 11 can be detached from the battery mounting portion 7. The battery pack 11 includes a secondary battery. In an embodiment, the battery pack 11 includes a rechargeable lithium-ion battery. By being mounted on the battery mounting portion 7, the battery pack 11 can supply power to the electric tool 1.

[0052] The motor 8 generates power for driving the output shaft 6. The motor 8 is driven by electric power supplied from the battery pack 11. The power transmission mechanism 10 transmits the power generated by the motor 8 to the output shaft 6. The output shaft 6 is driven by the power transmitted from the motor 8 via the power transmission mechanism 10.

[0053] The electric tool 1 includes a trigger switch 12 , a forward / reverse switching lever 13 , a speed switching lever 14 , a mode switching ring 15 , a switching ring 16 , a lamp 17 , and a controller 18 .

[0054] The trigger switch 12 is disposed on the handle housing 2. The trigger switch 12 protrudes forward from the upper portion of the front portion of the handle housing 2. The trigger switch 12 is operated by the operator. The operator can operate the trigger switch 12 with a finger while holding the handle housing 2 with one of the left and right hands. By operating the trigger switch 12, power is supplied from the battery pack 11 to the motor 8, thereby driving the motor 8. By operating the trigger switch 12, the driving and stopping of the motor 8 can be switched.

[0055] The forward / reverse switching lever 13 is provided at the upper portion of the handle housing 2. The forward / reverse switching lever 13 is operated by the operator. By operating the forward / reverse switching lever 13, the rotation direction of the motor 8 can be switched. The operator can operate the forward / reverse switching lever 13 to switch the rotation direction of the motor 8 from one of the forward direction and the reverse direction to the other. By switching the rotation direction of the motor 8, the rotation direction of the output shaft 6 can be switched.

[0056] The speed switching lever 14 is provided at the upper portion of the main body housing 3. The speed switching lever 14 is operated by an operator. By operating the speed switching lever 14, the rotation speed of the output shaft 6 can be switched. The operator can operate the speed switching lever 14 to switch the rotation speed of the output shaft 6 from one of the first speed and the second speed higher than the first speed to the other.

[0057] The mode switching ring 15 is arranged in front of the gear housing 5. The mode switching ring 15 is operated by an operator. By operating the mode switching ring 15, the working mode of the electric power tool 1 can be switched.

[0058] The operation mode of the electric tool 1 includes a vibration mode and a non-vibration mode. In the vibration mode, the output shaft 6 vibrates in the front-to-back direction; in the non-vibration mode, the output shaft 6 does not vibrate in the front-to-back direction. The non-vibration mode includes a drilling mode and a clutch mode. In the drilling mode, power is transmitted to the output shaft 6 regardless of the rotation load acting on the output shaft 6; in the clutch mode, the power transmitted to the output shaft 6 is cut off according to the rotation load acting on the output shaft 6.

[0059] The switching ring 16 is arranged in front of the mode switching ring 15. The switching ring 16 is operated by the operator. In the clutch mode, by operating the switching ring 16, a release value for cutting off the power transmitted to the output shaft 6 is set. The release value is a value related to the rotational load acting on the output shaft 6. When the rotational load acting on the output shaft 6 reaches the release value, the power transmitted to the output shaft 6 can be cut off.

[0060] The lamp 17 is provided at the upper portion of the front portion of the handle housing 2. The lamp 17 is for emitting illumination light for illuminating the front of the electric tool 1. The lamp 17 includes, for example, a light emitting diode (LED: Light Emitting Diode).

[0061] The controller 18 is used to output a control signal for controlling the electric tool 1. The controller 18 is used to control the driving current supplied to the motor 8. The controller 18 is accommodated in the handle housing 2. The controller 18 is arranged at the lower part of the internal space of the handle housing 2.

[0062] [Motor]

[0063] The motor 8 is a brushless motor. The motor 8 is an inner rotor type motor having a cylindrical stator 20 and a rotor 19 disposed inside the stator 20. The rotor 19 has a rotor shaft 19S extending in the axial direction. The rotor 19 is rotatable around a rotation axis AX.

[0064] [Overall structure of stator]

[0065] Figure 2 This is a perspective view showing the stator 20 according to the embodiment as viewed from one axial side. Figure 3 This is a perspective view showing the stator 20 according to the embodiment as seen from the other axial side. Figure 4 It is a side view showing the stator 20 according to the embodiment. Figure 5 It is an exploded perspective view showing the stator 20 according to the embodiment.

[0066] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the stator 20 has a stator core 30 , an insulator 40 , a coil unit 50 , and a terminal unit 60 .

[0067] The stator core 30 is made of a metal having iron as a main component and includes an inner core 31 and an outer core 32 arranged around the inner core 31 .

[0068] The insulator 40 is arranged to cover at least a portion of the surface of the stator core 30. The insulator 40 is made of an insulating material. The insulator 40 is made of a synthetic resin. The insulator 40 has an inner insulator 41 and an outer insulator 42, wherein the inner insulator 41 is used to cover at least a portion of the surface of the inner core 31; and the outer insulator 42 is used to cover at least a portion of the surface of the outer core 32.

[0069] In the embodiment, the inner core 31 and the inner insulator 41 are collectively referred to as the inner member 21 as appropriate. In addition, the outer core 32 and the outer insulator 42 are collectively referred to as the outer member 22 as appropriate.

[0070] The coil unit 50 includes a plurality of coils 51 and a jumper wire 52 for connecting one coil 51 to another coil 51. The coil unit 50 is formed of a winding wire 53 made of metal.

[0071] The coil 51 is wound around at least a portion of the stator core 30 via the insulator 40 . In the embodiment, the coil 51 is wound around at least a portion of the inner member 21 .

[0072] Six coils 51 are provided. The coils 51 are formed by winding a winding wire 53. The lap wire 52 refers to the winding wire 53 between one coil 51 and another coil 51. In the axial direction, the lap wire 52 is arranged between the center of the coil 51 and the end of the other side of the coil 51. That is, the lap wire 52 is arranged at a position close to the end of the other axial side of the coil 51. The lap wire 52 does not protrude from the coil 51 to the other axial side.

[0073] The terminal unit 60 is used to connect the coil 51 to the power supply unit. The power supply unit is configured outside the motor 8. The power supply unit is used to supply a driving current to the motor 8. The power supply unit includes a battery pack 11. The controller 18 is used to control the driving current supplied from the power supply unit to the motor 8. The driving current includes a U-phase driving current, a V-phase driving current, and a W-phase driving current. The driving current from the power supply unit is supplied to the terminal unit 60.

[0074] In the axial direction, the terminal unit 60 is arranged between the center of the coil 51 and one end of the coil 51. That is, the terminal unit 60 is arranged near the one axial end of the coil 51. The terminal unit 60 does not protrude from the coil 51 to one axial side.

[0075] The terminal unit 60 has a supporting part 61 made of an insulating material, an external terminal 62 connected to a power supply unit via an electric wire (not shown), a welding terminal 63 connected to the coil 51, a short-circuit part 64 connecting the external terminal 62 and the welding terminal 63 together, a plurality of rotation detection elements 65 for detecting the rotation of the rotor 19, a signal terminal 66 for outputting a detection signal of the rotation detection element 65, and a signal line 67 connecting the rotation detection element 65 and the signal terminal 66 together.

[0076] The support member 61 is made of synthetic resin and supports the external terminal 62 , the welding terminal 63 , the short-circuit member 64 , the rotation detection element 65 , the signal terminal 66 , and the signal line 67 .

[0077] In the axial direction, the support member 61 is arranged between the center of the coil 51 and one end of the coil 51. The support member 61 does not protrude from the coil 51 to one side in the axial direction.

[0078] At least a portion of the support member 61 is disposed radially inward of the coil 51. At least a portion of the support member 61 is disposed radially inward of the inner surface 39 of the stator core 30. The inner surface 39 of the stator core 30 faces the rotor 19.

[0079] At least a portion of the support member 61 is arranged radially outward of the coil 51 .

[0080] At least a portion of the support member 61 is arranged inside the coil 51. The coil 51 is arranged so as to be wound around at least a portion of the support member 61. The support member 61 is arranged on one axial side of the stator core 30. The support member 61 is supported by the stator core 30 via the insulator 40. The coil 51 is arranged so as to be wound around the stator core 30 and the support member 61.

[0081] The external terminal 62 is arranged radially outward from the coil 51. The external terminal 62 includes a U-phase external terminal 62U for supplying a U-phase drive current, a V-phase external terminal 62V for supplying a V-phase drive current, and a W-phase external terminal 62W for supplying a W-phase drive current.

[0082] A plurality of welding terminals 63 are arranged around the rotation axis AX. The same number of welding terminals 63 as the number of coils 51 is provided. In the embodiment, six welding terminals 63 are provided. In the axial direction, the positions of the plurality of welding terminals 63 are equal.

[0083] The welding terminal 63 is arranged radially inward of the coil 51. The welding terminal 63 is connected to the coil 51 via the winding wire 53 protruding radially inward from the coil 51.

[0084] At least a portion of the welding terminal 63 is arranged radially inward of the inner surface 39 of the stator core 30 .

[0085] The short-circuit member 64 is used to connect the external terminal 62 and the welding terminal 63. At least a portion of the short-circuit member 64 is arranged radially inward of the coil 51. At least a portion of the short-circuit member 64 is arranged radially outward of the coil 51. The short-circuit member 64 is used to connect a pair of welding terminals 63.

[0086] At least a portion of the short-circuit member 64 is disposed inside the support member 61. At least a portion of the signal line 67 is disposed inside the support member 61. The short-circuit member 64 and the signal line 67 are molded from synthetic resin. In the embodiment, the terminal unit 60 includes a molded interconnect device (MID).

[0087] <Inside Parts>

[0088] Figure 6 It is a perspective view showing the inner member 21 according to the embodiment. Figure 7 2 is a perspective exploded view showing the inner member 21 according to the embodiment. Figure 6 and Figure 7 As shown, the inner member 21 includes an inner core 31 and an inner insulator 41 that covers at least a portion of the surface of the inner core 31 .

[0089] The inner core 31 includes a plurality of core members 33. The plurality of core members 33 have the same shape and size. The core members 33 are arranged at equal intervals in the circumferential direction. In the embodiment, the inner core 31 is composed of six core members 33. The core members 33 are arranged at intervals of 60[°] in the circumferential direction.

[0090] Figure 8 3 is a perspective view showing the core member 33 according to the embodiment. Figure 6 , Figure 7 and Figure 8 As shown, the core member 33 includes an inner wall portion 34, an outer wall portion 35 arranged at a radially outer side than the inner wall portion 34, and a tooth portion 36 connecting the inner wall portion 34 and the outer wall portion 35. The inner wall portion 34, the outer wall portion 35 and the tooth portion 36 are integrated. That is, the inner wall portion 34, the outer wall portion 35 and the tooth portion 36 are a single component.

[0091] The core member 33 includes a plurality of steel plates stacked in the axial direction. The steel plate is a metal plate having iron as a main component. The core member 33 is formed by stacking a plurality of steel plates. The core member 33 has a constant size in the axial direction.

[0092] The inner wall portion 34 is disposed at a portion around the rotation axis AX. The inner wall portion 34 is plate-shaped. The inner wall portion 34 is connected to the inner end portion of the tooth portion 36 on the radial inner side. The inner wall portion 34 is arc-shaped in a plane perpendicular to the rotation axis AX.

[0093] The teeth 36 protrude radially outward from the inner wall 34. The teeth 36 is block-shaped. The coil 51 is wound around the teeth 36.

[0094] The outer wall portion 35 is disposed at a portion around the rotation axis AX. The outer wall portion 35 is plate-shaped. The outer wall portion 35 is connected to the radially outer outer end of the tooth portion 36. The outer wall portion 35 is arc-shaped in a plane perpendicular to the rotation axis AX.

[0095] In the circumferential direction, the size of the inner wall portion 34 is larger than the size of the tooth portion 36. In the circumferential direction, the size of the outer wall portion 35 is larger than the size of the inner wall portion 34 and the size of the tooth portion 36. In the circumferential direction, the position of the center of the inner wall portion 34, the position of the center of the tooth portion 36, and the position of the center of the outer wall portion 35 are consistent. The inner wall portion 34 includes a protrusion 34T protruding from the inner end of the tooth portion 36 to one side and the other side in the circumferential direction, respectively. The outer wall portion 35 includes a protrusion 35T protruding from the outer end of the tooth portion 36 to one side and the other side in the circumferential direction, respectively.

[0096] The surface of the core member 33 includes an inner surface 33A facing radially inward, an outer surface 33B facing radially outward, an end surface 33C facing one axial side, and an end surface 33D facing the other axial side.

[0097] The inner surface 33A is disposed on the inner wall portion 34 . The inner surface 33A faces the rotor 19 . The inner surface 33A is arc-shaped in a plane perpendicular to the rotation axis AX. The inner surface 39 of the stator core 30 includes the inner surface 33A of the core member 33 .

[0098] The outer surface 33B is arranged on the outer wall portion 35. The outer surface 33B faces the outer member 22. The outer surface 33B has an arc shape in a plane perpendicular to the rotation axis AX.

[0099] The end surface 33C includes an end surface on one axial side of the inner wall portion 34, an end surface on one axial side of the outer wall portion 35, and an end surface on one axial side of the tooth portion 36. The end surface on one axial side of the inner wall portion 34, the end surface on one axial side of the outer wall portion 35, and the end surface on one axial side of the tooth portion 36 are arranged in the same surface. The end surface 33C is orthogonal to the rotation axis AX.

[0100] The end surface 33D includes the end surface on the other axial side of the inner wall portion 34, the end surface on the other axial side of the outer wall portion 35, and the end surface on the other axial side of the tooth portion 36. The end surface on the other axial side of the inner wall portion 34, the end surface on the other axial side of the outer wall portion 35, and the end surface on the other axial side of the tooth portion 36 are arranged in the same surface. The end surface 33D is orthogonal to the rotation axis AX.

[0101] In addition, the surface of the core component 33 includes a facing surface 33E arranged on the inner wall portion 34 and facing the radial outside, a facing surface 33F arranged on the outer wall portion 35 and facing the radial inside, a side surface 33G arranged on the tooth portion 36 and facing one side in the circumferential direction, a side surface 33H arranged on the tooth portion 36 and facing the other side in the circumferential direction, a side surface 33I arranged on the outer wall portion 35 and facing one side in the circumferential direction, and a side surface 33J arranged on the outer wall portion 35 and facing the other side in the circumferential direction.

[0102] Fig. 9 1 is a perspective view showing a part of the inner insulator 41 involved in the embodiment. The inner insulator 41 is made of an insulating material. The inner insulator 41 is made of a synthetic resin. The inner insulator 41 is arranged so as to cover at least a part of the surface of the core member 33. The inner insulator 41 is integrally molded. The plurality of core members 33 are connected by the inner insulator 41.

[0103] like Figure 6 , Figure 7 and Fig. 9 As shown, the inner insulator 41 includes a covering portion 41C covering the end surface 33C, a covering portion 41D covering the end surface 33D, a covering portion 41E covering the facing surface 33E, a covering portion 41F covering the facing surface 33F, a covering portion 41G covering the side surface 33G, and a covering portion 41H covering the side surface 33H. The covering portions 41C, 41D, 41E, 41F, 41G, and 41H are integrated.

[0104] The covering portion 41C is arranged at a position closer to one side in the axial direction than the covering portion 41D. The covering portion 41C and the covering portion 41D face each other with a gap therebetween. The covering portion 41G is arranged at a position closer to one side in the circumferential direction than the covering portion 41H. The covering portion 41G and the covering portion 41H face each other with a gap therebetween. The tooth portion 36 is arranged inside a space 41S defined by the covering portion 41C, the covering portion 41D, the covering portion 41G, and the covering portion 41H.

[0105] The covering portion 41E is arranged to cover the facing surface 33E of the protrusion 34T protruding from the inner end of the tooth portion 36 toward one circumferential side and the facing surface 33E of the protrusion 34T protruding from the inner end of the tooth portion 36 toward the other circumferential side.

[0106] The covering portion 41F is arranged to cover the facing surface 33F of the protrusion 35T protruding from the outer end of the tooth portion 36 toward one circumferential side and the facing surface 33F of the protrusion 35T protruding from the outer end of the tooth portion 36 toward the other circumferential side.

[0107] In addition, the inner insulator 41 has a connecting portion 41J. The connecting portion 41J extends in the axial direction. The connecting portion 41J is arranged in a manner that connects the radially inner end of the covering portion 41C and the radially inner end of the covering portion 41D. Six connecting portions 41J are arranged in a manner that is spaced apart in the circumferential direction. The connecting portion 41J is arranged between the core components 33 adjacent in the circumferential direction. The inner surface of the connecting portion 41J faces the rotor 19. The inner surface of the connecting portion 41J is arranged between the inner surfaces 33A adjacent in the circumferential direction. The inner surface 39 of the stator core 30 includes the inner surface of the core component 33 and the inner surface of the connecting portion 41J.

[0108] like Figure 6 As shown in FIG. 1 , a gap 43 is provided between the side surface 33I of the first core member 33 and the side surface 33J of the second core member 33 adjacent to the first core member 33. The gap 43 is provided between the cover portion 41F covering the facing surface 33F of the first core member 33 and the cover portion 41F covering the facing surface 33F of the second core member 33. The gap 43 is provided between the radially outer end of the cover portion 41C covering the end surface 33C of the first core member 33 and the radially outer end of the cover portion 41C covering the end surface 33C of the second core member 33. The gap 43 is provided between the radially outer end of the cover portion 41D covering the end surface 33D of the first core member 33 and the radially outer end of the cover portion 41D covering the end surface 33D of the second core member 33.

[0109] The inner surface 33A, the outer surface 33B, the side surface 33I, and the side surface 33J of the core member 33 are not provided with the inner insulator 41. The inner surface 33A, the outer surface 33B, the side surface 33I, and the side surface 33J each include the surface of a steel plate (metal having iron as a main component).

[0110] The inner insulator 41 has a protrusion 41T protruding from the cover 41D to the other radial side. The center of the connection portion 41J coincides with the center of the protrusion 41T in the circumferential direction. Six protrusions 41T are provided at intervals in the circumferential direction. The protrusions 41T are used to support the lap wire 52.

[0111] <Outer Parts>

[0112] Fig.10 It is a perspective view showing the outer member 22 according to the embodiment. Fig.11FIG. 2 is a perspective exploded view showing the outer member 22 according to the embodiment. Fig.10 and Fig.11 As shown, the outer member 22 includes an outer core 32 and an outer insulator 42 for covering at least a portion of the surface of the outer core 32 .

[0113] The outer core 32 includes a plurality of steel plates stacked in the axial direction. The steel plate is a metal plate having iron as a main component. The outer core 32 is formed by stacking a plurality of steel plates. The outer core 32 is arranged around the rotation axis AX. The outer core 32 is cylindrical.

[0114] The outer core 32 has a cylindrical portion 37 and a plurality of protrusions 38. The cylindrical portion 37 is cylindrical. The cylindrical portion 37 is arranged around the rotation axis AX. The plurality of protrusions 38 protrude radially inward from the inner surface of the cylindrical portion 37, respectively. The plurality of protrusions 38 are arranged at intervals in the circumferential direction. In an embodiment, the protrusions 38 are arranged at equal intervals in the circumferential direction. Six protrusions 38 are provided. The protrusions 38 are arranged at intervals of 60[°] in the circumferential direction. The cylindrical portion 37 and the protrusions 38 are integrated. That is, the cylindrical portion 37 and the protrusions 38 are a single component. In the axial direction, the size of the outer core 32 is constant.

[0115] The surface of the outer core 32 includes an inner surface 32A facing radially inward, an outer surface 32B facing radially outward, an end surface 32C facing one axial side, and an end surface 32D facing the other axial side.

[0116] The inner surface 32A is disposed in the cylindrical portion 37. The inner surface 32A includes the inner surface of the cylindrical portion 37. The inner surface 32A faces the inner member 21. The inner surface 32A has an arc shape in a plane perpendicular to the rotation axis AX.

[0117] The outer surface 32B is arranged on the cylindrical portion 37. The outer surface 32B includes the outer surface of the cylindrical portion 37. The outer surface 32B has an arc shape in a plane perpendicular to the rotation axis AX.

[0118] The end surface 32C includes an axial end surface of the cylindrical portion 37 and an axial end surface of the protruding portion 38. The axial end surface of the cylindrical portion 37 and the axial end surface of the protruding portion 38 are arranged on the same surface. The end surface 32C is orthogonal to the rotation axis AX.

[0119] The end surface 32D includes the other axial end surface of the cylindrical portion 37 and the other axial end surface of the protruding portion 38. The other axial end surface of the cylindrical portion 37 and the other axial end surface of the protruding portion 38 are arranged on the same surface. The end surface 32D is orthogonal to the rotation axis AX.

[0120] The surface of outer core 32 includes inner surface 32E arranged on protrusion 38 and facing radially inward, side surface 32F arranged on protrusion 38 and facing one circumferential side, and side surface 32G arranged on protrusion 38 and facing the other circumferential side.

[0121] The outer insulator 42 is made of an insulating material. The outer insulator 42 is made of a synthetic resin. The outer insulator 42 is arranged so as to cover at least a part of the surface of the outer core 32.

[0122] like Fig.10 and Fig.11 As shown, the outer insulator 42 includes a covering portion 42C covering the end surface 32C, a covering portion 42D covering the end surface 32D, and a covering portion 42E covering the inner surface 32E.

[0123] The cover portion 42C is arranged on one side of the cover portion 42D in the axial direction. The cover portion 42C and the cover portion 42D face each other with a gap therebetween. The cover portion 42C and the cover portion 42D are connected via the cover portion 42E. The cover portion 42C, the cover portion 42D, and the cover portion 42E are integrated.

[0124] No outer insulator 42 is disposed on inner surface 32A, outer surface 32B, side surface 32F, and side surface 32G of outer core 32. Inner surface 32A, outer surface 32B, side surface 32F, and side surface 32G include surfaces of steel plates (metal containing iron as a main component).

[0125] The inner member 21 is arranged inside the outer member 22. The outer member 22 is arranged around the inner member 21. The inner member 21 and the outer member 22 are connected together by inserting the protrusion 38 of the outer member 22 into the gap 43 of the inner member 21. The side surface 33I of the inner member 21 contacts the side surface 32G of the outer member 22. The side surface 33J of the inner member 21 contacts the side surface 32F of the outer member 22.

[0126] [Coil unit]

[0127] Fig.12 It is a perspective view showing coil unit 50 according to the embodiment as seen from above. Fig.13 This is a perspective view showing coil unit 50 according to the embodiment as seen from below.

[0128] The coil unit 50 has six coils 51 and a jumper wire 52 for connecting one coil 51 to another coil 51 .

[0129] The six coils 51 are connected as a U (WU) phase, a V (UV) phase, and a W (VW) phase. A pair of coils 51 is allocated to each of the U phase, the V phase, and the W phase.

[0130] The six coils 51 include a pair of U-phase coils 51U allocated to the U phase, a pair of V-phase coils 51V allocated to the V phase, and a pair of W-phase coils 51W allocated to the W phase.

[0131] The pair of U-phase coils 51U are arranged to face each other in the radial direction. The pair of V-phase coils 51V are arranged to face each other in the radial direction. The pair of W-phase coils 51W are arranged to face each other in the radial direction.

[0132] The jumper wires 52 include a jumper wire 52U connecting the pair of U-phase coils 51U together, a jumper wire 52V connecting the pair of V-phase coils 51V together, and a jumper wire 52W connecting the pair of W-phase coils 51W together.

[0133] The coil 51 is formed by a winding machine. The winding machine forms the coil 51 by winding the winding wire 53. The winding wire 53 includes a winding wire 53U forming the U-phase coil 51U and the overlapping wire 52U, a winding wire 53V forming the V-phase coil 51V and the overlapping wire 52V, and a winding wire 53W forming the W-phase coil 51W and the overlapping wire 52W.

[0134] The U-phase coil 51U and the jumper wire 52U are formed by a winding wire 53U. Fig.12 As shown, the winding machine starts winding the winding wire 53U from the winding start portion 53US to form a U-phase coil 51U. By winding the winding wire 53U, a U-phase coil 51U is formed. After forming a U-phase coil 51U, in order to form another U-phase coil 51U, the winding machine starts winding the winding wire 53U at a position facing the one U-phase coil 51U. By winding the winding wire 53U, another U-phase coil 51U is formed. Fig.12 As shown, the winding machine finishes winding the winding wire 53U at the winding end portion 53UE. The overlapping wire 52U is composed of the winding wire 53U connecting one U-phase coil 51U and the other U-phase coil 51U.

[0135] The V-phase coil 51V and the jumper wire 52V are formed by a winding wire 53V. Fig.12 As shown, after the winding machine starts winding the winding wire 53V from the winding start portion 53VS to form one V-phase coil 51V, it winds the winding wire 53V at a position facing the one V-phase coil 51V to form another V-phase coil 51V. The winding machine ends winding the winding wire 53V at the winding end portion 53VE. The overlapping wire 52V is composed of the winding wire 53V connecting the one V-phase coil 51V and the other V-phase coil 51V.

[0136] The W-phase coil 51W and the jumper wire 52W are formed by a winding wire 53W. Fig.12 As shown, after the winding machine starts winding the winding wire 53W from the winding start portion 53WS to form one W-phase coil 51W, it winds the winding wire 53W at a position facing the one W-phase coil 51W to form another W-phase coil 51W. The winding machine ends winding the winding wire 53W at the winding end portion 53WE. The overlapping wire 52W is composed of the winding wire 53W connecting the one W-phase coil 51W and the other W-phase coil 51W.

[0137] In the embodiment, the winding machine forms the coil 51 and the overlapping line 52 while simultaneously unwinding two winding wires 53. The winding machine may form the coil 51 and the overlapping line 52 while unwinding one winding wire 53.

[0138] [Terminal unit]

[0139] Fig.14 It is a perspective view showing the terminal unit 60 according to the embodiment. Fig.15 It is a side view showing the terminal unit 60 according to the embodiment. Fig.16 It is a perspective view showing the internal structure of the terminal unit 60 according to the embodiment. Fig.17 It is an exploded perspective view showing the terminal unit 60 according to the embodiment.

[0140] The terminal unit 60 has a supporting part 61, an external terminal 62 for inputting a driving current, a welding terminal 63 connected to the coil 51, a short-circuit part 64 connecting the external terminal 62 and the welding terminal 63 together, a plurality of rotation detection elements 65 for detecting the rotation of the rotor 19, a signal terminal 66 for outputting a detection signal of the rotation detection element 65, and a signal line 67 connecting the rotation detection element 65 and the signal terminal 66 together.

[0141] The support member 61 is made of an insulating material. The support member 61 is made of a synthetic resin. The support member 61 supports the welding terminal 63, the short-circuit member 64, the rotation detection element 65, the signal terminal 66, and the signal line 67, respectively. At least a portion of the support member 61 is arranged radially inside the coil 51. At least a portion of the support member 61 is arranged radially outside the coil 51.

[0142] The support member 61 has an annular portion 611 and a protruding portion 612 protruding radially outward from the annular portion 611. The annular portion 611 has an opening 613. The opening 613 is substantially circular in a plane perpendicular to the rotation axis AX.

[0143] The annular portion 611 is plate-shaped and has an end surface 611A facing one axial side, an end surface 611B facing the other axial side, an inner surface 611C facing radially inward, and an outer surface 611D facing radially outward. The inner surface 611C defines the opening 613. The inner surface 611C faces the rotor 19.

[0144] like Fig.15 and Fig.17 As shown, the thickness Ha of the annular portion 611 is smaller than the diameter D of the opening 613. The thickness Ha refers to the distance between the end surface 611A and the end surface 611B in the axial direction.

[0145] The annular portion 611 has a recessed portion 68 that is recessed radially outward from the inner surface 611C. Six recessed portions 68 are provided at intervals in the circumferential direction. The welding terminal 63 is disposed inside each of the plurality of recessed portions 68 .

[0146] The annular portion 611 has a recessed portion 69 provided on the end surface 611A. Three recessed portions 69 are provided at intervals in the circumferential direction. The rotation detection element 65 is disposed in each of the plurality of recessed portions 69 .

[0147] The protrusions 612 protrude radially outward from the outer surface 611D of the annular portion 611. Six protrusions 612 are provided at intervals in the circumferential direction. The protrusions 612 include a first protrusion 6121, a second protrusion 6122, a third protrusion 6123, a fourth protrusion 6124, a fifth protrusion 6125, and a sixth protrusion 6126.

[0148] The protrusion 612 is plate-shaped and has an end surface 612A facing one side in the axial direction and an end surface 612B facing the other side in the axial direction.

[0149] like Fig.15 and Fig.17 As shown, the thickness Hb of the protruding portion 612 is smaller than the thickness Ha of the annular portion 611. The thickness Hb refers to the distance between the end surface 612A and the end surface 612B in the axial direction.

[0150] The first protrusion 6121, the second protrusion 6122, and the third protrusion 6123 each have a support portion 70 for supporting the external terminal 62. In the circumferential direction, the second protrusion 6122 is arranged adjacent to the first protrusion 6121, and the third protrusion 6123 is arranged adjacent to the second protrusion 6122. The support portion 70 is block-shaped. Fig.17 As shown, the support portion 70 has a hole 71 for arranging at least a part of the external terminal 62. The signal terminal 66 is arranged on the sixth protrusion 6126.

[0151] The external terminal 62 is connected to the power supply unit. The external terminal 62 is arranged radially outward from the coil 51. The external terminal 62 is connected to the short-circuit member 64.

[0152] The drive current from the power supply unit is input to the external terminal 62. The external terminal 62 includes a U-phase external terminal 62U for inputting a U-phase drive current, a V-phase external terminal 62V for inputting a V-phase drive current, and a W-phase external terminal 62W for inputting a W-phase drive current.

[0153] The external terminal 62 is supported by the support member 61. The external terminal 62 is arranged on the protruding portion 612. The U-phase external terminal 62U is arranged on the first protruding portion 6121. The V-phase external terminal 62V is arranged on the second protruding portion 6122. The W-phase external terminal 62W is arranged on the third protruding portion 6123.

[0154] The welding terminal 63 is connected to the coil 51. The welding terminal 63 is arranged radially inward of the coil 51. In the embodiment, the welding terminal 63 is connected to the winding wire 53 protruding radially inward from the coil 51. The welding terminal 63 is connected to the coil 51 via the winding wire 53 protruding radially inward from the coil 51.

[0155] The welding terminal 63 is supported by the support member 61. The welding terminal 63 is arranged on the annular portion 611. A plurality of welding terminals 63 are arranged around the rotation axis AX. In the axial direction, the positions of the plurality of welding terminals 63 are substantially equal.

[0156] The number of welding terminals 63 provided is the same as the number of coils 51. In the embodiment, six welding terminals 63 are provided. The welding terminals 63 include a pair of welding terminals 63U, a pair of welding terminals 63V, and a pair of welding terminals 63W.

[0157] The short-circuit component 64 is supported by the support component 61. The short-circuit component 64 connects the external terminal 62 and the welding terminal 63 together. At least a portion of the short-circuit component 64 is arranged radially inside the coil 51. At least a portion of the short-circuit component 64 is arranged radially outside the coil 51. The welding terminal 63 and the short-circuit component 64 are integrated. That is, the welding terminal 63 and the short-circuit component 64 are a single component.

[0158] The short-circuit member 64 is bent in a plane perpendicular to the rotation axis AX. The drive current input to the external terminal 62 is supplied to the coil 51 via the short-circuit member 64 and the welding terminal 63 .

[0159] The short-circuit components 64 include short-circuit components 64U that connect the U-phase external terminal 62U and the pair of welding terminals 63U, short-circuit components 64V that connect the V-phase external terminal 62V and the pair of welding terminals 63V, and short-circuit components 64W that connect the W-phase external terminal 62W and the pair of welding terminals 63W. The welding terminal 63U and the short-circuit components 64U are a single component. The welding terminal 63V and the short-circuit components 64V are a single component. The welding terminal 63W and the short-circuit components 64W are a single component.

[0160] The U-phase external terminal 62U is arranged at one end of the short-circuit component 64U. One welding terminal 63U is arranged at the other end of the short-circuit component 64U. Another welding terminal 63U is arranged at the middle part of the short-circuit component 64U. The middle part of the short-circuit component 64U refers to the part between one end and the other end of the short-circuit component 64U.

[0161] The V-phase external terminal 62V is arranged at one end of the short-circuit component 64V. One welding terminal 63V is arranged at the other end of the short-circuit component 64V. Another welding terminal 63V is arranged at the middle part of the short-circuit component 64V. The middle part of the short-circuit component 64V ​​refers to the part between one end and the other end of the short-circuit component 64V.

[0162] The W-phase external terminal 62W is arranged at one end of the short-circuit component 64W. One welding terminal 63W is arranged at the other end of the short-circuit component 64W. Another welding terminal 63W is arranged at the middle part of the short-circuit component 64W. The middle part of the short-circuit component 64W refers to the part between one end and the other end of the short-circuit component 64W.

[0163] The rotation detection element 65 is supported by the support member 61. The rotation detection element 65 is arranged on the annular portion 611. The rotation detection element 65 detects the position of the rotor 19 in the rotation direction by detecting the position of the permanent magnet provided on the rotor 19. The rotation detection element 65 includes a Hall element. Three rotation detection elements 65 are provided. The rotation detection element 65 is arranged at a position radially inward of the coil 51. The detection signal of the rotation detection element 65 is output to the controller 18 via the signal line 67 and the signal terminal 66. The controller 18 supplies a drive current to the coil 51 according to the detection signal of the rotation detection element 65.

[0164] The signal terminal 66 is supported by the support member 61. The signal terminal 66 is arranged at a position radially outside the coil 51. The signal terminal 66 is connected to the rotation detection element 65 via a signal line 67. At least a portion of the signal line 67 is arranged at a position radially inside the coil 51. At least a portion of the signal line 67 is arranged at a position radially outside the coil 51.

[0165] At least a portion of the short-circuit component 64 is disposed inside the support component 61. At least a portion of the signal line 67 is disposed inside the support component 61. The short-circuit component 64 and the signal line 67 are molded with synthetic resins, respectively. The terminal unit 60 includes a molded circuit component (MID: Molded Interconnect Device). By molding the short-circuit component 64 and the signal line 67 with synthetic resins, at least a portion of the short-circuit component 64 and at least a portion of the signal line 67 are disposed inside the support component 61.

[0166] Fig.18 is a perspective view showing a welding terminal 63 according to an embodiment. Fig.18 As shown, the welding terminal 63 includes a base portion 631 , a connecting portion 632 , a first plate portion 633 , a bent portion 634 , and a second plate portion 635 .

[0167] The base 631 is connected to the short-circuit component 64. In addition, the base 631 can also be regarded as at least a part of the short-circuit component 64.

[0168] The first plate portion 633 is disposed on one axial side relative to the base portion 631. The second plate portion 635 is disposed on one axial side relative to the first plate portion 633.

[0169] The connection portion 632 connects the radial inner end portion of the base portion 631 and the radial inner end portion of the first plate portion 633 .

[0170] The bent portion 634 connects the radially outer end portion of the first plate portion 633 and the radially outer end portion of the second plate portion 635 .

[0171] In the welding terminal 63, an opening 636 is defined between the radially inner end of the first plate portion 633 and the radially inner end of the second plate portion 635. The winding wire 53 can pass through the opening 636. The winding wire 53 is connected to the welding terminal 63 while being arranged between the first plate portion 633 and the second plate portion 635.

[0172] [Relationship between coil and welding terminal]

[0173] Fig.19 : is a perspective view showing the relationship between the coil 51 and the welding terminal 63 according to the embodiment. The welding terminal 63 includes a welding terminal 63U, a welding terminal 63V, and a welding terminal 63W. Two welding terminals 63U are provided. Two welding terminals 63V are provided. Two welding terminals 63W are provided.

[0174] The welding terminal 63U is connected to the W-phase coil 51W and the U-phase coil 51U adjacent to each other in the circumferential direction. The welding terminal 63V is connected to the U-phase coil 51U and the V-phase coil 51V adjacent to each other in the circumferential direction. The welding terminal 63W is connected to the V-phase coil 51V and the W-phase coil 51W adjacent to each other in the circumferential direction.

[0175] The short-circuit member 64U connects the two welding terminals 63U together. The short-circuit member 64V connects the two welding terminals 63V together. The short-circuit member 64W connects the two welding terminals 63W together.

[0176] Two U-phase coils 51U are provided. A welding terminal 63U is connected to one U-phase coil 51U. A welding terminal 63V is connected to the other U-phase coil 51U.

[0177] Two V-phase coils 51V are provided. A welding terminal 63V is connected to one V-phase coil 51V. A welding terminal 63W is connected to the other V-phase coil 51V.

[0178] Two W-phase coils 51W are provided. A welding terminal 63W is connected to one W-phase coil 51W. A welding terminal 63U is connected to the other W-phase coil 51W.

[0179] One welding terminal 63U is connected to a winding wire 53W protruding radially inward from the W-phase coil 51W. The other welding terminal 63U is connected to a winding wire 53U protruding radially inward from the U-phase coil 51U.

[0180] One welding terminal 63V is connected to a winding wire 53U protruding radially inward from the U-phase coil 51U. The other welding terminal 63V is connected to a winding wire 53V protruding radially inward from the V-phase coil 51V.

[0181] One welding terminal 63W is connected to a winding wire 53V protruding radially inward from the V-phase coil 51V. The other welding terminal 63W is connected to a winding wire 53W protruding radially inward from the W-phase coil 51W.

[0182] The two U-phase coils 51U are connected via a jumper wire 52U.

[0183] The two V-phase coils 51V are connected via a jumper line 52V.

[0184] The two W-phase coils 51W are connected via a jumper wire 52W.

[0185] Fig. 20 , Fig.21 as well as Fig. 22 Each of them is a diagram schematically showing an example of a flow state of a driving current according to the embodiment.

[0186] like Fig. 20As shown, when the U-phase drive current is input to the U-phase external terminal 62U, the U-phase drive current is supplied to a W-phase coil 51W and a U-phase coil 51U respectively via the short-circuit component 64U and the welding terminal 63U. A W-phase coil 51W and a U-phase coil 51U are respectively excited to the N pole, for example. The U-phase drive current flowing in one W-phase coil 51W is supplied to another W-phase coil 51W via the jumper wire 52W. The U-phase drive current flowing in one U-phase coil 51U is supplied to another U-phase coil 51U via the jumper wire 52U. Another W-phase coil 51W and another U-phase coil 51U are respectively excited to the S pole, for example. The W-phase drive current flowing in another W-phase coil 51W is output from the W-phase external terminal 62W. The U-phase drive current flowing in another U-phase coil 51U is output from the V-phase external terminal 62V.

[0187] like Fig.21 As shown, when the V-phase drive current is input to the V-phase external terminal 62V, the V-phase drive current is supplied to a U-phase coil 51U and a V-phase coil 51V respectively via the short-circuit component 64V ​​and the welding terminal 63V. A U-phase coil 51U and a V-phase coil 51V are respectively excited to the N pole, for example. The V-phase drive current flowing in one U-phase coil 51U is supplied to another U-phase coil 51U via the jumper wire 52U. The V-phase drive current flowing in one V-phase coil 51V is supplied to another V-phase coil 51V via the jumper wire 52V. Another U-phase coil 51U and another V-phase coil 51V are respectively excited to the S pole, for example. The V-phase drive current flowing in another U-phase coil 51U is output from the U-phase external terminal 62U. The V-phase drive current flowing in another V-phase coil 51V is output from the W-phase external terminal 62W.

[0188] like Fig. 22 As shown, when the W-phase drive current is input to the W-phase external terminal 62W, the W-phase drive current is supplied to a V-phase coil 51V and a W-phase coil 51W via the short-circuit component 64W and the welding terminal 63W, respectively. A V-phase coil 51V and a W-phase coil 51W are respectively excited to the N pole, for example. The W-phase drive current flowing in one V-phase coil 51V is supplied to another V-phase coil 51V via the jumper wire 52V. The W-phase drive current flowing in one W-phase coil 51W is supplied to another W-phase coil 51W via the jumper wire 52W. Another V-phase coil 51V and another W-phase coil 51W are respectively excited to the S pole, for example. The W-phase drive current flowing in another V-phase coil 51V is output from the V-phase external terminal 62V. The W-phase drive current flowing in another W-phase coil 51W is output from the U-phase external terminal 62U.

[0189] [Assembly method of stator]

[0190] Next, a method of assembling the stator 20 according to the embodiment will be described. Figure 23 to Figure 27 Each of them is a diagram for explaining a method of assembling the stator 20 according to the embodiment.

[0191] like Fig.23 As shown, a terminal unit 60 is arranged on one axial side of the inner member 21 including the inner core 31 and the inner insulator 41. The support member 61 is arranged on one axial side of the inner core 31. The support member 61 is supported by the inner core 31 via the inner insulator 41.

[0192] In the axial direction, the protrusion 612 of the support member 61 is arranged adjacent to the teeth 36. That is, the terminal unit 60 is arranged on one axial side of the inner member 21 so that the position of the protrusion 612 coincides with the position of the teeth 36 in the circumferential direction.

[0193] like Fig.23 As shown, at least a portion of the support member 61 is arranged radially inward of the inner surface 39 of the stator core 30. The inner surface 39 of the stator core 30 includes the inner surface of the inner core 31. The inner surface of the inner core 31 includes the inner surface 33A of the core member 33 and the inner surface of the connecting portion 41J.

[0194] In the embodiment, at least a portion of the annular portion 611 of the support member 61 is arranged radially inward of the inner surface 39 of the stator core 30. That is, in the radial direction, the distance between the inner surface 611C of the annular portion 611 and the rotation axis AX is shorter than the distance between the inner surface 39 of the stator core 30 and the rotation axis AX.

[0195] Furthermore, at least a portion of the welding terminal 63 is arranged radially inward of the inner surface 39 of the stator core 30 .

[0196] like Fig.24 As shown, after the terminal unit 60 is arranged on one axial side of the inner member 21, the coil 51 is wound. The coil 51 is arranged so as to be wound around at least a portion of the support member 61. The coil 51 is arranged so as to be wound around the teeth 36 and the protrusion 612.

[0197] The coil 51 is arranged radially outward from the annular portion 611 so as to be wound around the teeth portion 36 and the protruding portion 612. The annular portion 611 is arranged radially inward from the coil 51.

[0198] The coil 51 is wound by a winding machine. The coil 51 is wound around the tooth portion 36 and the protrusion 612 in a predetermined winding manner. As a winding method of the coil 51, a nozzle method or a flying winding method can be exemplified. The winding machine has a nozzle that can feed out the winding wire 53. When the coil 51 is wound around the tooth portion 36 and the protrusion 612 by the nozzle method, the nozzle enters between the adjacent tooth portions 36 and the protrusion 612 through the gap 43, and feeds out the winding wire 53 while winding around the tooth portion 36 and the protrusion 612. In a state where the winding wire 53 is fed out from the nozzle, the nozzle is wound around the tooth portion 36 and the protrusion 612, and the coil 51 can be arranged around the tooth portion 36 and the protrusion 612. The coil 51 is electrically insulated from the inner core 31 including the tooth portion 36 by the inner insulator 41.

[0199] In addition, the winding method is not limited to the nozzle method and the flyer method.

[0200] like Fig.25 As shown, the jumper wire 52 connecting the plurality of coils 51 is arranged around the protrusion 41T of the inner insulator 41. The protrusion 41T protrudes from the cover 41D to the other side in the axial direction. The jumper wire 52 is arranged so as to be wound around the protrusion 41T. For example, the plurality of jumpers 52 are stacked in the axial direction.

[0201] like Fig.26 As shown, after the coil 51 is wound, the winding wire 53 is connected to the welding terminal 63 by the welding device 100. The winding wire 53 is arranged between the first plate portion 633 and the second plate portion 635 of the welding terminal 63. The winding wire 53 is inserted between the first plate portion 633 and the second plate portion 635 through the opening 636.

[0202] The welding device 100 includes a first electrode 101 and a second electrode 102. The first electrode 101 is disposed above the welding terminal 63. The second electrode 102 is disposed below the welding terminal 63. The welding terminal 63 is disposed radially inward of the inner surface 39 of the stator core 30. Therefore, the welding device 100 can dispose the second electrode 102 disposed inside the stator core 30 below the welding terminal 63.

[0203] The welding device 100 presses the welding terminal 63 by the first electrode 101 and the second electrode 102 in a state where the winding wire 53 is arranged between the first plate portion 633 and the second plate portion 635 so that the first plate portion 633 and the second plate portion 635 are close to each other. In addition, the welding device 100 heats the welding terminal 63 while pressing the welding terminal 63 by the first electrode 101 and the second electrode 102. Thus, the winding wire 53 and the welding terminal 63 are connected by welding.

[0204] The welding device 100 includes the same number of first electrodes 101 as the number of welding terminals 63. The welding device 100 includes the same number of second electrodes 102 as the number of welding terminals 63. The first electrode 101 is arranged above each of the plurality of welding terminals 63. The second electrode 102 is arranged below each of the plurality of welding terminals 63. The positions of the plurality of welding terminals 63 are equal in the axial direction. The welding device 100 can simultaneously connect the plurality of welding terminals 63 to the winding wire 53.

[0205] like Fig. 27 As shown, the inner member 21 on which the coil 51 and the terminal unit 60 are mounted is pressed into the outer member 22 in the axial direction, thereby connecting the inner member 21 and the outer member 22. The inner member 21 is pressed into the outer member 22 in such a manner that the protrusion 38 of the outer member 22 fits into the gap 43 of the inner member 21. Thus, the stator 20 is formed.

[0206] In addition, the inner member 21 and the outer member 22 may be fixed together by press-fitting, may be fixed together by welding, or may be fixed together by bolts.

[0207] [Effect]

[0208] As described above, according to the embodiment, the welding terminal 63 connected to the coil 51 can be arranged radially inward of the coil 51. Therefore, the radial dimension of the stator 20 can be reduced. Thus, the motor 8 can be miniaturized. Therefore, the electric tool 1 can be miniaturized.

[0209] At least a portion of the welding terminal 63 is arranged at a position radially inward of the inner surface 39 of the stator core 30. Conventionally, the space inside the stator core is mostly idle space. According to the embodiment, at least a portion of the welding terminal 63 is arranged at a position radially inward of the inner surface 39 of the stator core 30. According to the embodiment, the idle space can be effectively utilized to achieve miniaturization of the motor 8.

[0210] The welding terminal 63 is connected to the coil 51 via the winding wire 53 protruding radially inward from the coil 51. Thus, the welding terminal 63 arranged radially inward of the coil 51 and the coil 51 can be smoothly connected.

[0211] The welding terminal 63 includes a first plate portion 633, a second plate portion 635, a bent portion 634, and an opening 636, wherein the second plate portion 635 is arranged at a position closer to one side in the axial direction than the first plate portion 633; ​​the bent portion 634 connects the radially outer end of the first plate portion 633 and the radially outer end of the second plate portion 635; and the opening 636 is defined between the radially inner end of the first plate portion 633 and the radially inner end of the second plate portion 635. The winding wire 53 is inserted between the first plate portion 633 and the second plate portion 635 through the opening 636. Thus, the welding device 100 can heat the welding terminal 63 while pressing the winding wire 53 using the first electrode 101 and the second electrode 102 arranged in the axial direction in a state where the winding wire 53 is arranged between the first plate portion 633 and the second plate portion 635.

[0212] A plurality of welding terminals 63 are arranged around the rotation axis AX. The positions of the plurality of welding terminals 63 are equal in the axial direction. Thus, the welding device 100 can simultaneously connect the plurality of welding terminals 63 to the winding wire 53 .

[0213] At least a portion of the support member 61 is disposed radially inwardly of the coil 51. Therefore, the support member 61 can appropriately support the welding terminal 63. In addition, since at least a portion of the support member 61 is disposed radially inwardly of the coil 51, the radial dimension of the stator 20 can be reduced. Thus, the motor 8 can be miniaturized.

[0214] At least a portion of the support member 61 is disposed radially inward of the inner surface 39 of the stator core 30. Thus, the idle space can be effectively utilized, and the motor 8 can be miniaturized.

[0215] The support member 61 is disposed on one axial side of the stator core 30 and is supported by the stator core 30. This can reduce the axial dimension of the stator 20. Therefore, the motor 8 can be miniaturized.

[0216] The coil 51 is arranged to be wound around at least a portion of the support member 61. In the embodiment, the coil 51 is arranged to be wound around the teeth 36 and the protrusion 612. The terminal unit 60 and the stator core 30 are fixed together by the coil 51. In addition, the axial dimension of the stator 20 can be reduced.

[0217] The support member 61 supports not only the welding terminal 63 but also the short-circuit member 64. Therefore, the stator 20 can be miniaturized.

[0218] The welding terminal 63 and the short-circuit component 64 are integrated. Therefore, the manufacturing process of the terminal unit 60 can be simplified. In addition, at least a part of the short-circuit component 64 and at least a part of the signal line 67 are arranged inside the support member 61. The terminal unit 60 includes a molded circuit component (MID: Molded Interconnect Device). Therefore, the terminal unit 60 can be miniaturized.

[0219] At least a portion of the short-circuit component 64 is arranged at a position radially inward of the coil 51 and connected to the welding terminal 63. At least a portion of the short-circuit component 64 is arranged at a position radially outward of the coil 51 and connected to the external terminal 62. The welding terminal 63, the external terminal 62 and at least a portion of the short-circuit component 64 are arranged in a plane orthogonal to the rotation axis AX. Therefore, the axial dimension of the terminal unit 60 can be reduced.

[0220] The support member 61 supports not only the welding terminal 63 and the short-circuit member 64 but also the rotation detection element 65. Therefore, the stator 20 can be miniaturized.

[0221] In the axial direction, the terminal unit 60 including the support member 61 is arranged between the center of the coil 51 and the end of one side of the coil 51. That is, the terminal unit 60 is arranged at a position close to the end of one side of the axial direction of the coil 51 so as not to protrude in the axial direction from the coil 51. Therefore, the axial dimension of the stator 20 can be reduced.

[0222] In the axial direction, the overlap wire 52 is arranged between the center of the coil 51 and the end of the other side of the coil 51. That is, the overlap wire 52 is arranged at a position close to the end of the other side of the axial direction of the coil 51 so as not to protrude in the axial direction from the coil 51. Therefore, the axial dimension of the stator 20 can be reduced.

[0223] The stator 20 includes an inner member 21 and an outer member 22, wherein the inner member 21 is used to wind the coil 51, and the outer member 22 is arranged around the inner member 21. The inner member 21 includes a plurality of core members 33, wherein each of the plurality of core members 33 has a tooth portion 36 for winding the coil 51, and an inner insulator 41, wherein the plurality of core members 33 have teeth portions 36, respectively, and the inner insulator 41 is used to connect the plurality of core members 33. Since the plurality of core members 33 are connected together by the inner insulator 41, the relative positional deviation of the plurality of teeth portions 36 can be suppressed.

[0224] When the coil 51 is wound around the teeth 36 and the protrusion 612, the nozzle enters between the adjacent teeth 36 and the protrusion 612 through the gap 43, and surrounds the teeth 36 and the protrusion 612. Since the interval between the adjacent teeth 36 and the protrusion 612 is large, it is possible to fully ensure the space for the nozzle to move. Thus, the operation of winding the coil 51 around the teeth 36 and the protrusion 612 can be efficiently implemented. In addition, the coil 51 is appropriately wound around the teeth 36 and the protrusion 612 in an arranged state. Therefore, the space factor of the coil 51 can be increased.

[0225] The inner member 21 has a gap 43 for the protrusion 38 of the outer member 22 to fit into. Thus, the inner member 21 and the outer member 22 can be positioned with high accuracy and can be appropriately connected together.

[0226] The jumper line 52 is arranged around the protruding portion 41T of the inner insulator 41. Thus, the jumper line 52 can be efficiently arranged.

[0227] [Other embodiments]

[0228] In the above embodiment, the electric tool 1 is set as a vibration driver drill. The electric tool 1 is not limited to a vibration driver drill. Examples of the electric tool 1 include a driver drill, an angle drill, an impact driver, a grinder, a hammer, a hammer drill, a circular saw, and a reciprocating saw.

[0229] In the above-mentioned embodiment, the electric working machine is set as an electric tool. The electric working machine is not limited to the electric tool. As the electric working machine, a gardening tool can be exemplified. As the gardening tool, a chain saw, a hedge trimmer, a lawn mower, a brush cutter, and a blower can be exemplified.

[0230] In the above-described embodiment, the battery pack 11 mounted on the battery mounting portion 7 is used as the power source of the electric working machine. As the power source of the electric working machine, a commercial power source (AC power source) may be used.

[0231] [Explanation of Reference Numerals]

[0232] 1: Power tool (power work machine); 2: Handle housing; 3: Main housing; 3A: Air inlet; 3B: Exhaust port; 4: Motor housing; 5: Gear housing; 6: Output shaft; 7: Battery mounting portion; 8: Motor; 9: Rear cover; 10: Power transmission mechanism; 11: Battery pack; 12: Trigger switch; 13: Forward and reverse switching lever; 14: Speed ​​switching lever; 15: Mode switching ring; 16: Switching ring; 17: Light; 18: Controller; 19: Rotor; 19S: Rotor shaft; 20: Stator; 21: Inner part; 22: Outer part; 30: Stator core; 31: Inner core; 32: Outer core; 32A: Inner surface; 32B: Outer surface; 32C: End surface; 32D: End surface; 32E: Inner surface; 3 2F: side surface; 32G: side surface; 33: core member; 33A: inner surface; 33B: outer surface; 33C: end surface; 33D: end surface; 33E: facing surface; 33F: facing surface; 33G: side surface; 33H: side surface; 33I: side surface; 33J: side surface; 34: inner wall; 34T: protrusion; 35: outer wall; 35T: protrusion; 36: tooth; 37: cylinder; 38: protrusion; 39: inner surface; 40: insulator; 41: inner insulator; 41C: cover; 41D: cover; 41E: cover; 41F: cover; 41G: cover; 41H: cover; 41J: connection; 41S: space; 41T: protrusion; 42: outer side Insulator; 42C: Covering portion; 42D: Covering portion; 42E: Covering portion; 43: Gap; 50: Coil unit; 51: Coil; 51U: U-phase coil; 51V: V-phase coil; 51W: W-phase coil; 52: Overlap wire; 52U: Overlap wire; 52V: Overlap wire; 52W: Overlap wire; 53: Winding wire; 53U: Winding wire; 53UE: Winding end portion; 53US: Winding start portion; 53V: Winding wire; 53VE: Winding end portion; 53VS: Winding start portion; 53W: Winding wire; 53WE: Winding end portion; 53WS: Winding start portion; 60: Terminal unit; 61: Support member; 62: External terminal; 62U: U-phase external terminal; 62V: V-phase External terminal; 62W: W-phase external terminal; 63: welding terminal; 63U: welding terminal; 63V: welding terminal; 63W: welding terminal; 64: short-circuit component; 64U: short-circuit component; 64V: short-circuit component; 64W: short-circuit component; 65: rotation detection element; 66: signal terminal; 67: signal line; 68: recess; 69: recess; 70: support portion; 71: hole; 100: welding device; 101: first electrode; 102: second electrode; 611: annular portion; 611A: end surface; 611B: end surface; 611C: inner surface; 611D: outer surface; 612: protrusion; 612A: end surface; 612B: end surface; 613: opening; 631: base; 632: connection portion;633: 1st plate portion; 634: curved portion; 635: 2nd plate portion; 636: opening; 6121: 1st protrusion; 6122: 2nd protrusion; 6123: 3rd protrusion; 6124: 4th protrusion; 6125: 5th protrusion; 6126: 6th protrusion. ;

Claims

1. An electric working machine, characterized in that: A motor and an output shaft are provided, wherein The motor has a stator and a rotor, wherein the rotor is arranged inside the stator and can rotate around a rotation axis; The output shaft is used to mount a top tool and is driven according to the power transmitted from the motor. The stator comprises a stator core, an insulator, a plurality of coils, a plurality of welding terminals, a U-phase external terminal, a V-phase external terminal, a W-phase external terminal and a supporting member made of an insulating material, wherein: The stator core has an annular core and a plurality of teeth that can be engaged with the annular core on the inner diameter side; The insulator is arranged to cover at least a portion of a surface of the stator core; The plurality of coils are respectively wound around at least a portion of the plurality of teeth via the insulator, and include at least one U-phase coil, at least one V-phase coil, and at least one W-phase coil; The plurality of welding terminals are arranged radially inwardly of the plurality of coils, and include a U-phase welding terminal electrically connected to the at least one U-phase coil, a V-phase welding terminal electrically connected to the at least one V-phase coil, and a W-phase welding terminal electrically connected to the at least one W-phase coil; The U-phase external terminal is formed integrally with at least one of the U-phase fusion terminals; the V-phase external terminal is formed integrally with at least one of the V-phase fusion terminals; the W-phase external terminal is formed integrally with at least one of the W-phase fusion terminals; The support member is used to support the plurality of welding terminals, the U-phase external terminal, the V-phase external terminal, and the W-phase external terminal. Each connection location between the plurality of coils and the plurality of welding terminals is arranged radially inward of the inner surface of the plurality of teeth.

2. The electric working machine according to claim 1, characterized in that: The support member includes a plurality of annular portions and a plurality of protrusions, wherein the plurality of protrusions protrude radially outward from the plurality of annular portions. The plurality of coils are respectively wound around the plurality of protruding portions.

3. The electric working machine according to claim 1, characterized in that: At least one of the U-phase fusion terminals includes a first U-phase fusion terminal and a second U-phase fusion terminal, at least one of the V-phase fusion terminals includes a first V-phase fusion terminal and a second V-phase fusion terminal, and at least one of the W-phase fusion terminals includes a first W-phase fusion terminal and a second W-phase fusion terminal. The stator includes a U-phase short-circuit component connecting the first U-phase welding terminal and the second U-phase welding terminal, a V-phase short-circuit component connecting the first V-phase welding terminal and the second V-phase welding terminal, and a W-phase short-circuit component connecting the first W-phase welding terminal and the second W-phase welding terminal. The U-phase short-circuit component, the V-phase short-circuit component, and the W-phase short-circuit component are supported by the support member.

4. The electric working machine according to claim 3, characterized in that: At least a portion of each of the U-phase short-circuit component, the V-phase short-circuit component, and the W-phase short-circuit component is disposed inside the support member.

5. The electric working machine according to claim 3, characterized in that: The first U-phase fusing terminal and the second U-phase fusing terminal are integrated with the U-phase short-circuit component, the first V-phase fusing terminal and the second V-phase fusing terminal are integrated with the V-phase short-circuit component, and the first W-phase fusing terminal and the second W-phase fusing terminal are integrated with the W-phase short-circuit component.

6. The electric working machine according to claim 3, characterized in that: At least a first portion of each of the U-phase short-circuit component, the V-phase short-circuit component, and the W-phase short-circuit component is arranged radially inward of the coil. At least a second portion of each of the U-phase short-circuit component, the V-phase short-circuit component, and the W-phase short-circuit component is arranged radially outward of the coil.

7. The electric working machine according to claim 1, characterized in that: It also has a plurality of rotation detection elements, which are configured to detect the rotation of the rotor. The plurality of rotation detection elements are arranged radially inward of inner surfaces of the plurality of teeth portions.

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