Electric power tool

Abstract

To reduce a size of an electric work machine.SOLUTION: An electric work machine includes: a motor including a stator and a rotor; and an output shaft. The stator includes: a stator core having a ring core and at least three teeth which can be engaged with the ring core on an inner diameter side; an insulated insulator arranged to cover at least a part of a surface of the stator core; three coils wound to at least a part of three teeth through the insulator; three terminals arranged radially inside the three coils and connected to the three coils; a U layer external terminal, a V layer external terminal and a W layer external terminal, which are integrally formed with the three terminals; and a support member for supporting the three terminals, the U layer external terminal, the V layer external terminal and the W layer external layer. Connection parts between the coils and the three terminals are arranged radially inside an inner face of the teeth.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a power-operated work machine.

Background Art

[0002] In the technical field related to power-operated work machines, power tools having a brushless motor as disclosed in Patent Document 1 are known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Miniaturization of power-operated work machines is desired. In order to miniaturize a power-operated work machine, it is necessary to miniaturize the motor.

[0005] The present disclosure aims to miniaturize a power-operated work machine.

Means for Solving the Problems

[0006] According to the present disclosure, there is provided a power-operated work machine including a motor having a stator and a rotor disposed inside the stator and rotatable about a rotation axis, and an output shaft to which a tip tool is attached and which is driven based on power transmitted from the motor, wherein the stator includes a stator core, a coil wound around at least a part of the stator core, and a housing terminal disposed radially inward of the coil and connected to the coil.

Effects of the Invention

[0007] According to the present disclosure, miniaturization of a power-operated work machine can be achieved.

Brief Description of the Drawings

[0008]

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DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments according to the present disclosure will be described with reference to the drawings, but the present disclosure is not limited thereto. The components of the embodiments described below can be combined as appropriate. Also, some components may not be used.

[0010] In the embodiment, the positional relationship of each part is described using the terms left, right, front, rear, top, and bottom. These terms indicate the relative position or direction based on the center of the electric working machine. The electric working machine includes a power tool having a motor.

[0011] 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 around the rotation axis AX of the motor is appropriately referred to as the circumferential direction or the rotation direction. Further, in the radial direction, the position close to or the direction approaching the rotation axis AX of the motor is appropriately referred to as the inner radial side, and the position far from or the direction separated from the rotation axis AX of the motor is appropriately referred to as the outer radial side.

[0012] [Power tool] FIG. 1 is a side view showing a power tool 1 according to an embodiment. In the embodiment, the power tool 1 is a vibration driver drill. As shown in FIG. 1, the power tool 1 includes a grip housing 2, a main body housing 3 disposed above the grip housing 2 and accommodating a motor 8 and a power transmission mechanism 10, an output shaft 6 protruding forward from the main body housing 3, and a battery mounting portion 7 disposed at the lower part of the grip housing 2.

[0013] The grip housing 2 is gripped by an operator. The grip housing 2 protrudes downward from the lower part of the main body housing 3. The grip housing 2 is made of synthetic resin.

[0014] The main body housing 3 includes a motor housing 4 and a gear housing 5 disposed in front of the motor housing 4. The output shaft 6 protrudes forward from the gear housing 5.

[0015] The motor housing 4 accommodates the motor 8. The motor housing 4 is cylindrical. The motor 8 is disposed in the internal space of the motor housing 4. The motor housing 4 is integral with the grip housing 2. The motor housing 4 is made of synthetic resin. A rear cover 9 is disposed at the rear part of the motor housing 4. The rear cover 9 covers the opening at the rear part of the motor housing 4. The rear cover 9 is made of synthetic resin.

[0016] The motor housing 4 has an air intake port 3A. The rear cover 9 has an exhaust port 3B. The exhaust port 3B is provided behind the air intake port 3A. The air intake port 3A connects the internal space and the external space of the main body housing 3. The exhaust port 3B connects the internal space and the external space of the main body housing 3. The air intake port 3A is provided on each of the left and right portions of the motor housing 4. The exhaust port 3B is provided on each of the left and right portions of the rear cover 9. 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 intake port 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.

[0017] The gear housing 5 houses a power transmission mechanism 10 including a plurality of gears. The gear housing 5 is cylindrical. The power transmission mechanism 10 is disposed in the internal space of the gear housing 5. The gear housing 5 is made of aluminum.

[0018] The output shaft 6 is attachable with a tip tool. A tip tool such as a drill is attached to the output shaft 6. The output shaft 6 includes a spindle that rotates by the power generated by the motor 8 and a chuck that can grip the tip tool.

[0019] The battery mounting portion 7 is connected to the battery pack 11. The battery mounting portion 7 is provided at the lower part of the grip housing 2. The battery pack 11 is detachable 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 power tool 1.

[0020] The motor 8 generates power for driving the output shaft 6. The motor 8 is driven based on the 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 based on the power transmitted from the motor 8 through the power transmission mechanism 10.

[0021] The electric tool 1 includes a trigger switch 12, a forward / reverse changeover lever 13, a speed changeover lever 14, a mode changer 15, a changer 16, a light 17, and a controller 18.

[0022] The trigger switch 12 is disposed in the grip housing 2. The trigger switch 12 protrudes forward from the upper part of the front portion of the grip housing 2. The trigger switch 12 is operated by an operator. The operator can operate the trigger switch 12 with a finger while holding the grip housing 2 with one of the left and right hands. When the trigger switch 12 is operated, power is supplied from the battery pack 11 to the motor 8, and the motor 8 is driven. When the trigger switch 12 is operated, the driving and stopping of the motor 8 are switched.

[0023] The forward / reverse changeover lever 13 is provided on the upper part of the grip housing 2. The forward / reverse changeover lever 13 is operated by an operator. When the forward / reverse changeover lever 13 is operated, the rotation direction of the motor 8 is switched. The operator can operate the forward / reverse changeover lever 13 to switch the rotation direction of the motor 8 from one of the forward rotation direction and the reverse rotation direction to the other. When the rotation direction of the motor 8 is switched, the rotation direction of the output shaft 6 is switched.

[0024] The speed changeover lever 14 is provided on the upper part of the main body housing 3. The speed changeover lever 14 is operated by an operator. When the speed changeover lever 14 is operated, the rotation speed of the output shaft 6 is switched. The operator can operate the speed changeover 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.

[0025] The mode changer 15 is disposed in front of the gear housing 5. The mode changer 15 is operated by an operator. When the mode changer 15 is operated, the working mode of the electric tool 1 is switched.

[0026] The operating modes of the power tool 1 include a vibration mode in which the output shaft 6 vibrates in the front-rear direction and a non-vibration mode in which the output shaft 6 does not vibrate in the front-rear direction. The non-vibration mode includes a drill mode in which power is transmitted to the output shaft 6 regardless of the rotational load acting on the output shaft 6, and a clutch mode in which the power transmitted to the output shaft 6 is cut off based on the rotational load acting on the output shaft 6.

[0027] The change ring 16 is arranged in front of the mode change 15. The change ring 16 is operated by the operator. In the clutch mode, when the change ring 16 is operated, 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 is cut off.

[0028] The light 17 is provided at the upper part of the front portion of the grip housing 2. The light 17 emits illumination light for illuminating the front of the power tool 1. The light 17 includes, for example, light emitting diodes (LEDs).

[0029] The controller 18 outputs a control signal for controlling the power tool 1. The controller 18 controls the drive current supplied to the motor 8. The controller 18 is housed in the grip housing 2. The controller 18 is arranged at the lower part of the internal space of the grip housing 2.

[0030] [Motor] 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 arranged inside the stator 20. The rotor 19 has a rotor shaft 19S extending in the axial direction. The rotor 19 is rotatable about the rotation axis AX.

[0031] [Overall Structure of Stator] FIG. 2 is a perspective view of the stator 20 according to the embodiment, as viewed from one axial side. FIG. 3 is a perspective view of the stator 20 according to the embodiment, as viewed from the other axial side. FIG. 4 is a side view of the stator 20 according to the embodiment. FIG. 5 is an exploded perspective view of the stator 20 according to the embodiment.

[0032] As shown in FIGS. 2, 3, 4, and 5, the stator 20 includes a stator core 30, an insulator 40, a coil unit 50, and a terminal unit 60.

[0033] The stator core 30 is made of a metal mainly composed of iron. The stator core 30 has an inner core 31 and an outer core 32 disposed around the inner core 31.

[0034] The insulator 40 is disposed so as to cover at least a part 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 that covers at least a part of the surface of the inner core 31 and an outer insulator 42 that covers at least a part of the surface of the outer core 32.

[0035] In the embodiment, the inner core 31 and the inner insulator 41 are collectively referred to as the inner member 21 as appropriate. Also, the outer core 32 and the outer insulator 42 are collectively referred to as the outer member 22 as appropriate.

[0036] The coil unit 50 has a plurality of coils 51 and a jumper wire 52 that connects one coil 51 to another coil 51. The coil unit 50 is formed by a metal wire 53.

[0037] The coil 51 is wound around at least a part of the stator core 30 via the insulator 40. In the embodiment, the coil 51 is wound around at least a part of the inner member 21.

[0038] Six coils 51 are provided. The coil 51 is formed by winding a wire 53. The jumper wire 52 refers to the wire 53 between one coil 51 and another coil 51. In the axial direction, the jumper wire 52 is disposed between the center of the coil 51 and the end portion on the other side of the coil 51. That is, the jumper wire 52 is disposed at a position close to the end portion on the other axial side of the coil 51. The jumper wire 52 does not protrude axially on the other side from the coil 51.

[0039] The terminal unit 60 connects the coil 51 and the power supply unit. The power supply unit is disposed outside the motor 8. The power supply unit supplies a drive current to the motor 8. The power supply unit includes a battery pack 11. The controller 18 controls the drive current supplied from the power supply unit to the motor 8. The drive current includes a U-phase drive current, a V-phase drive current, and a W-phase drive current. The drive current from the power supply unit is supplied to the terminal unit 60.

[0040] In the axial direction, the terminal unit 60 is disposed between the center of the coil 51 and the end portion on one side of the coil 51. That is, the terminal unit 60 is disposed at a position close to the end portion on one axial side of the coil 51. The terminal unit 60 does not protrude axially on one side from the coil 51.

[0041] The terminal unit 60 includes a support member 61 made of an insulating material, an external terminal 62 connected to the power supply unit via a cable (not shown), a fusing terminal 63 connected to the coil 51, a short-circuit member 64 connecting the external terminal 62 and the fusing terminal 63, a plurality of rotation detection elements 65 for detecting the rotation of the rotor 19, a signal terminal 66 from which a detection signal of the rotation detection element 65 is output, and a signal line 67 connecting the rotation detection element 65 and the signal terminal 66.

[0042] The support member 61 is made of a synthetic resin. The support member 61 supports each of the external terminal 62, the fusing terminal 63, the short-circuit member 64, the rotation detection element 65, the signal terminal 66, and the signal line 67.

[0043] In the axial direction, the support member 61 is disposed between the center of the coil 51 and one end of the coil 51 on one side. The support member 61 does not protrude axially from the coil 51 on one side.

[0044] At least a part of the support member 61 is disposed radially inward of the coil 51. At least a part 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.

[0045] At least a part of the support member 61 is disposed radially outward of the coil 51.

[0046] At least a part of the support member 61 is disposed inside the coil 51. The coil 51 is disposed so as to wind at least a part of the support member 61. The support member 61 is disposed 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 disposed so as to wind the stator core 30 and the support member 61.

[0047] The external terminal 62 is disposed radially outward of the coil 51. The external terminal 62 includes a U-phase external terminal 62U to which a U-phase drive current is supplied, a V-phase external terminal 62V to which a V-phase drive current is supplied, and a W-phase external terminal 62W to which a W-phase drive current is supplied.

[0048] A plurality of fusing terminals 63 are arranged around the rotation axis AX. The number of fusing terminals 63 provided is the same as the number of coils 51. In the embodiment, six fusing terminals 63 are provided. In the axial direction, the positions of the plurality of fusing terminals 63 are equal.

[0049] The fusing terminal 63 is disposed radially inward of the coil 51. The fusing terminal 63 is connected to the coil 51 via a wire 53 that protrudes radially inward from the coil 51.

[0050] At least a part of the fusing terminal 63 is arranged radially inward of the inner surface 39 of the stator core 30.

[0051] The short - circuit member 64 connects the external terminal 62 and the fusing terminal 63. At least a part of the short - circuit member 64 is arranged radially inward of the coil 51. At least a part of the short - circuit member 64 is arranged radially outward of the coil 51. The short - circuit member 64 connects a pair of fusing terminals 63.

[0052] At least a part of the short - circuit member 64 is arranged inside the support member 61. At least a part of the signal line 67 is arranged inside the support member 61. Each of the short - circuit member 64 and the signal line 67 is molded with synthetic resin. In the embodiment, the terminal unit 60 includes a molded interconnect device (MID).

[0053] <Inner member> FIG. 6 is a perspective view showing the inner member 21 according to the embodiment. FIG. 7 is an exploded perspective view showing the inner member 21 according to the embodiment. As shown in FIGS. 6 and 7, the inner member 21 has an inner core 31 and an inner insulator 41 that covers at least a part of the surface of the inner core 31.

[0054] The inner core 31 includes a plurality of core segments 33. The shapes and dimensions of the plurality of core segments 33 are the same. The core segments 33 are arranged at equal intervals in the circumferential direction. In the embodiment, the inner core 31 is composed of six core segments 33. The core segments 33 are arranged at intervals of 60[°] in the circumferential direction.

[0055] FIG. 8 is a perspective view showing the core segment 33 according to the embodiment. As shown in FIGS. 6, 7, and 8, the core segment 33 has an inner wall portion 34, an outer wall portion 35 arranged radially outward of 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 integral. That is, the inner wall portion 34, the outer wall portion 35, and the tooth portion 36 are a single member.

[0056] The core segment 33 includes a plurality of steel plates laminated in the axial direction. The steel plates are metal plates mainly composed of iron. By laminating the plurality of steel plates, the core segment 33 is formed. In the axial direction, the dimensions of the core segment 33 are constant.

[0057] The inner wall portion 34 is disposed at a part 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 on the radially inner side of the teeth portion 36. In the plane orthogonal to the rotation axis AX, the inner wall portion 34 is arc-shaped.

[0058] The teeth portion 36 protrudes radially outward from the inner wall portion 34. The teeth portion 36 is block-shaped. The coil 51 is wound around the teeth portion 36.

[0059] The outer wall portion 35 is disposed at a part around the rotation axis AX. The outer wall portion 35 is plate-shaped. The outer wall portion 35 is connected to the outer end portion on the radially outer side of the teeth portion 36. In the plane orthogonal to the rotation axis AX, the outer wall portion 35 is arc-shaped.

[0060] In the circumferential direction, the dimensions of the inner wall portion 34 are larger than those of the teeth portion 36. In the circumferential direction, the dimensions of the outer wall portion 35 are larger than those of the inner wall portion 34 and the teeth portion 36. In the circumferential direction, the positions of the centers of the inner wall portion 34, the teeth portion 36, and the outer wall portion 35 coincide. The inner wall portion 34 includes protruding portions 34T that protrude from the inner end portion of the teeth portion 36 to each of one side and the other side in the circumferential direction. The outer wall portion 35 includes protruding portions 35T that protrude from the outer end portion of the teeth portion 36 to each of one side and the other side in the circumferential direction.

[0061] The surface of the core segment 33 includes an inner surface 33A facing radially inward, an outer surface 33B facing radially outward, an end surface 33C facing one side in the axial direction, and an end surface 33D facing the other side in the axial direction.

[0062] The inner surface 33A is disposed on the inner wall portion 34. The inner surface 33A faces the rotor 19. In a plane orthogonal to the rotation axis AX, the inner surface 33A is arc-shaped. The inner surface 39 of the stator core 30 includes the inner surface 33A of the core segment 33.

[0063] The outer surface 33B is disposed on the outer wall portion 35. The outer surface 33B faces the outer member 22. In a plane orthogonal to the rotation axis AX, the outer surface 33B is arc-shaped.

[0064] The end face 33C includes the end face on one axial side of the inner wall portion 34, the end face on one axial side of the outer wall portion 35, and the end face on one axial side of the tooth portion 36. The end face on one axial side of the inner wall portion 34, the end face on one axial side of the outer wall portion 35, and the end face on one axial side of the tooth portion 36 are arranged in the same plane. The end face 33C is orthogonal to the rotation axis AX.

[0065] The end face 33D includes the end face on the other axial side of the inner wall portion 34, the end face on the other axial side of the outer wall portion 35, and the end face on the other axial side of the tooth portion 36. The end face on the other axial side of the inner wall portion 34, the end face on the other axial side of the outer wall portion 35, and the end face on the other axial side of the tooth portion 36 are arranged in the same plane. The end face 33D is orthogonal to the rotation axis AX.

[0066] Also, the surface of the core segment 33 includes a facing surface 33E disposed on the inner wall portion 34 and facing radially outward, a facing surface 33F disposed on the outer wall portion 35 and facing radially inward, a side surface 33G disposed on the tooth portion 36 and facing one circumferential side, a side surface 33H disposed on the tooth portion 36 and facing the other circumferential side, a side surface 33I disposed on the outer wall portion 35 and facing one circumferential side, and a side surface 33J disposed on the outer wall portion 35 and facing the other circumferential side.

[0067] FIG. 9 is a perspective view showing a part of the inner insulator 41 according to 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 disposed so as to cover at least a part of the surface of the core segment 33. The inner insulator 41 is integrally formed. The plurality of core segments 33 are connected by the inner insulator 41.

[0068] As shown in FIGS. 6, 7, and 9, the inner insulator 41 includes a covering portion 41C that covers the end face 33C, a covering portion 41D that covers the end face 33D, a covering portion 41E that covers the opposing face 33E, a covering portion 41F that covers the opposing face 33F, a covering portion 41G that covers the side face 33G, and a covering portion 41H that covers the side face 33H. The covering portion 41C, the covering portion 41D, the covering portion 41E, the covering portion 41F, the covering portion 41G, and the covering portion 41H are integral.

[0069] The covering portion 41C is disposed on one axial side with respect to 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 disposed on one circumferential side with respect to the covering portion 41H. The covering portion 41G and the covering portion 41H face each other with a gap therebetween. The teeth portion 36 is disposed inside a space 41S defined by the covering portion 41C, the covering portion 41D, the covering portion 41G, and the covering portion 41H.

[0070] The covering portion 41E is disposed so as to cover each of the opposing face 33E of the protruding portion 34T protruding from the inner end portion of the teeth portion 36 to one circumferential side and the opposing face 33E of the protruding portion 34T protruding from the inner end portion of the teeth portion 36 to the other circumferential side.

[0071] The covering portion 41F is disposed so as to cover each of the opposing face 33F of the protruding portion 35T protruding from the outer end portion of the teeth portion 36 to one circumferential side and the opposing face 33F of the protruding portion 35T protruding from the outer end portion of the teeth portion 36 to the other circumferential side.

[0072] 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 to connect 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 at intervals in the circumferential direction. The connecting portion 41J is arranged between the adjacent core segments 33 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 adjacent inner surfaces 33A in the circumferential direction. The inner surface 39 of the stator core 30 includes the inner surfaces of the core segments 33 and the inner surface of the connecting portion 41J.

[0073] As shown in FIG. 6, a gap 43 is provided between the side surface 33I of the first core segment 33 and the side surface 33J of the second core segment 33 adjacent to the first core segment 33. The gap 43 is provided between the covering portion 41F covering the opposing surface 33F of the first core segment 33 and the covering portion 41F covering the opposing surface 33F of the second core segment 33. The gap 43 is provided between the radially outer end of the covering portion 41C covering the end face 33C of the first core segment 33 and the radially outer end of the covering portion 41C covering the end face 33C of the second core segment 33. The gap 43 is provided between the radially outer end of the covering portion 41D covering the end face 33D of the first core segment 33 and the radially outer end of the covering portion 41D covering the end face 33D of the second core segment 33.

[0074] The inner insulator 41 is not arranged on each of the inner surface 33A, outer surface 33B, side surface 33I, and side surface 33J of the core segment 33. Each of the inner surface 33A, outer surface 33B, side surface 33I, and side surface 33J includes the surface of a steel plate (a metal mainly composed of iron).

[0075] The inner insulator 41 has a protruding portion 41T that protrudes radially to the other side from the covering portion 41D. In the circumferential direction, the position of the center of the connecting portion 41J and the position of the center of the protruding portion 41T coincide. Six protruding portions 41T are provided at intervals in the circumferential direction. The protruding portion 41T supports the jumper wire 52.

[0076] <Outer member> FIG. 10 is a perspective view showing the outer member 22 according to the embodiment. FIG. 11 is an exploded perspective view showing the outer member 22 according to the embodiment. As shown in FIGS. 10 and 11, the outer member 22 includes an outer core 32 and an outer insulator 42 that covers at least a part of the surface of the outer core 32.

[0077] The outer core 32 includes a plurality of steel plates laminated in the axial direction. The steel plate is a metal plate mainly composed of iron. By laminating the plurality of steel plates, the outer core 32 is formed. The outer core 32 is disposed around the rotation axis AX. The outer core 32 is cylindrical.

[0078] The outer core 32 has a cylindrical portion 37 and a plurality of protruding portions 38. The cylindrical portion 37 is cylindrical. The cylindrical portion 37 is disposed around the rotation axis AX. Each of the plurality of protruding portions 38 protrudes radially inward from the inner surface of the cylindrical portion 37. The plurality of protruding portions 38 are arranged at intervals in the circumferential direction. In the embodiment, the protruding portions 38 are arranged at equal intervals in the circumferential direction. Six protruding portions 38 are provided. The protruding portions 38 are arranged at intervals of 60 [°] in the circumferential direction. The cylindrical portion 37 and the protruding portion 38 are integral. That is, the cylindrical portion 37 and the protruding portion 38 are a single member. In the axial direction, the dimensions of the outer core 32 are constant.

[0079] 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 side in the axial direction, and an end surface 32D facing the other side in the axial direction.

[0080] The inner surface 32A is disposed on 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. In a plane orthogonal to the rotation axis AX, the inner surface 32A is arc-shaped.

[0081] The outer surface 32B is disposed on the cylindrical portion 37. The outer surface 32B includes the outer surface of the cylindrical portion 37. In a plane orthogonal to the rotation axis AX, the outer surface 32B is arc-shaped.

[0082] The end face 32C includes the end face on one axial side of the cylindrical portion 37 and the end face on one axial side of the protruding portion 38. The end face on one axial side of the cylindrical portion 37 and the end face on one axial side of the protruding portion 38 are arranged in the same plane. The end face 32C is orthogonal to the rotation axis AX.

[0083] The end face 32D includes the end face on the other axial side of the cylindrical portion 37 and the end face on the other axial side of the protruding portion 38. The end face on the other axial side of the cylindrical portion 37 and the end face on the other axial side of the protruding portion 38 are arranged in the same plane. The end face 32D is orthogonal to the rotation axis AX.

[0084] Further, the surface of the outer core 32 includes an inner surface 32E disposed on the protruding portion 38 and facing radially inward, a side surface 32F disposed on the protruding portion 38 and facing one circumferential side, and a side surface 32G disposed on the protruding portion 38 and facing the other circumferential side.

[0085] 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 disposed so as to cover at least a part of the surface of the outer core 32.

[0086] As shown in FIGS. 10 and 11, the outer insulator 42 includes a covering portion 42C that covers the end face 32C, a covering portion 42D that covers the end face 32D, and a covering portion 42E that covers the opposing face 33E.

[0087] The covering portion 42C is disposed on one axial side with respect to the covering portion 42D. The covering portion 42C and the covering portion 42D face each other with a gap therebetween. The covering portion 42C and the covering portion 42D are connected via the covering portion 42E. The covering portion 42C, the covering portion 42D, and the covering portion 42E are integral.

[0088] The outer insulator 42 is not disposed on each of the inner surface 32A, the outer surface 32B, the side surface 32F, and the side surface 32G of the outer core 32. The inner surface 32A, the outer surface 32B, the side surface 32F, and the side surface 32G include the surface of a steel plate (a metal mainly composed of iron).

[0089] The inner member 21 is disposed inside the outer member 22. The outer member 22 is disposed around the inner member 21. The inner member 21 and the outer member 22 are connected by inserting the protruding portion 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.

[0090] [Coil unit] FIG. 12 is a perspective view from above showing the coil unit 50 according to the embodiment. FIG. 13 is a perspective view from below showing the coil unit 50 according to the embodiment.

[0091] The coil unit 50 has six coils 51 and jumper wires 52 that connect one coil 51 to another coil 51.

[0092] The six coils 51 are connected as the U (W-U) phase, V (U-V) phase, and W (V-W) phase. A pair of coils 51 is assigned to each of the U phase, V phase, and W phase.

[0093] The six coils 51 include a pair of U-phase coils 51U assigned to the U phase, a pair of V-phase coils 51V assigned to the V phase, and a pair of W-phase coils 51W assigned to the W phase.

[0094] A pair of U-phase coils 51U are arranged to face each other in the radial direction. A pair of V-phase coils 51V are arranged to face each other in the radial direction. A pair of W-phase coils 51W are arranged to face each other in the radial direction.

[0095] The jumper wires 52 include a jumper wire 52U that connects a pair of U-phase coils 51U, a jumper wire 52V that connects a pair of V-phase coils 51V, and a jumper wire 52W that connects a pair of W-phase coils 51W.

[0096] The coil 51 is formed by a winding machine. The winding machine forms the coil 51 by winding the wire 53. The wire 53 includes a wire 53U that forms the U-phase coil 51U and the jumper wire 52U, a wire 53V that forms the V-phase coil 51V and the jumper wire 52V, and a wire 53W that forms the W-phase coil 51W and the jumper wire 52W.

[0097] The U-phase coil 51U and the jumper wire 52U are formed by a single wire 53U. As shown in FIG. 12, the winding machine starts winding the wire 53U from the starting winding portion 53US to form one U-phase coil 51U. When the wire 53U is wound, one U-phase coil 51U is formed. After forming one U-phase coil 51U, the winding machine starts winding the wire 53U at a position facing one U-phase coil 51U to form the other U-phase coil 51U. When the wire 53U is wound, the other U-phase coil 51U is formed. As shown in FIG. 12, the winding machine finishes winding the wire 53U at the ending winding portion 53UE. The jumper wire 52U is constituted by the wire 53U that connects one U-phase coil 51U and the other U-phase coil 51U.

[0098] The V-phase coil 51V and the jumper wire 52V are formed by a single wire 53V. As shown in FIG. 12, the winding machine starts winding the wire 53V from the starting winding portion 53VS, forms one V-phase coil 51V, and then winds the wire 53V at a position facing one V-phase coil 51V to form the other V-phase coil 51V. The winding machine finishes winding the wire 53V at the ending winding portion 53VE. The jumper wire 52V is constituted by the wire 53V that connects one V-phase coil 51V and the other V-phase coil 51V.

[0099] The W-phase coil 51W and the jumper wire 52W are formed by a single wire 53W. As shown in FIG. 12, the winding machine starts winding the wire 53W from the starting part 53WS, forms one W-phase coil 51W, and then winds the wire 53W at a position facing the one W-phase coil 51W to form the other W-phase coil 51W. The winding machine finishes winding the wire 53W at the ending part 53WE. The jumper wire 52W is composed of the wire 53W that connects the one W-phase coil 51W and the other W-phase coil 51W.

[0100] In the embodiment, the winding machine forms the coil 51 and the jumper wire 52 while feeding out two wires 53 simultaneously. The winding machine may also form the coil 51 and the jumper wire 52 while feeding out one wire 53.

[0101] [Terminal Unit] FIG. 14 is a perspective view showing the terminal unit 60 according to the embodiment. FIG. 15 is a side view showing the terminal unit 60 according to the embodiment. FIG. 16 is a perspective view showing the internal structure of the terminal unit 60 according to the embodiment. FIG. 17 is an exploded perspective view showing the terminal unit 60 according to the embodiment.

[0102] The terminal unit 60 includes a support member 61, an external terminal 62 to which a drive current is input, a fusing terminal 63 connected to the coil 51, a short-circuit member 64 connecting the external terminal 62 and the fusing terminal 63, a plurality of rotation detection elements 65 for detecting the rotation of the rotor 19, a signal terminal 66 from which a detection signal of the rotation detection element 65 is output, and a signal line 67 connecting the rotation detection element 65 and the signal terminal 66.

[0103] 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 each of the fusing terminal 63, the short-circuit member 64, the rotation detection element 65, the signal terminal 66, and the signal line 77. At least a part of the support member 61 is arranged radially inside the coil 51. At least a part of the support member 61 is arranged radially outside the coil 51.

[0104] The support member 61 has an annular portion 611 and a protruding portion 612 that protrudes radially outward from the annular portion 611. The annular portion 611 has an opening 613. In a plane orthogonal to the rotation axis AX, the opening 613 is substantially circular.

[0105] The annular portion 611 is plate-shaped. The annular portion 611 has an end face 611A facing one side in the axial direction, an end face 611B facing the other side in the axial direction, an inner surface 611C facing the inner side in the radial direction, and an outer surface 611D facing the outer side in the radial direction. The inner surface 611C defines the opening 613. The inner surface 611C faces the rotor 19.

[0106] As shown in FIGS. 15 and 17, 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 face 611A and the end face 611B in the axial direction.

[0107] The annular portion 611 has a recess 68 that is recessed radially outward from the inner surface 611C. Six recesses 68 are provided at intervals in the circumferential direction. A housing terminal 63 is disposed inside each of the plurality of recesses 68.

[0108] The annular portion 611 has a recess 69 provided on the end face 611A. Three recesses 69 are provided at intervals in the circumferential direction. A rotation detection element 65 is disposed in each of the plurality of recesses 69.

[0109] The protruding portion 612 protrudes radially outward from the outer surface 611D of the annular portion 611. Six protruding portions 612 are provided at intervals in the circumferential direction. The protruding portion 612 includes a first protruding portion 6121, a second protruding portion 6122, a third protruding portion 6123, a fourth protruding portion 6124, a fifth protruding portion 6125, and a sixth protruding portion 6126.

[0110] The protruding portion 612 is plate-shaped. The protruding portion 612 has an end face 612A facing one side in the axial direction and an end face 612B facing the other side in the axial direction.

[0111] As shown in FIGS. 15 and 17, 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 face 612A and the end face 612B in the axial direction.

[0112] Each of the first protruding portion 6121, the second protruding portion 6122, and the third protruding portion 6123 has a support portion 70 that supports the external terminal 62. In the circumferential direction, the second protruding portion 6122 is disposed adjacent to the first protruding portion 6121, and the third protruding portion 6123 is disposed adjacent to the second protruding portion 6122. The support portion 70 is in a block shape. As shown in FIG. 17, the support portion 70 has a hole 71 in which at least a part of the external terminal 62 is disposed. The signal terminal 66 is disposed in the sixth protruding portion 6126.

[0113] The external terminal 62 is connected to the power supply unit. The external terminal 62 is disposed radially outside the coil 51. The external terminal 62 is connected to the short - circuit member 64.

[0114] 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 to which a U - phase drive current is input, a V - phase external terminal 62V to which a V - phase drive current is input, and a W - phase external terminal 62W to which a W - phase drive current is input.

[0115] The external terminal 62 is supported by the support member 61. The external terminal 62 is disposed in the protruding portion 612. The U - phase external terminal 62U is disposed in the first protruding portion 6121. The V - phase external terminal 62V is disposed in the second protruding portion 6122. The W - phase external terminal 62W is disposed in the third protruding portion 6123.

[0116] The fusing terminal 63 is connected to the coil 51. The fusing terminal 63 is disposed radially inside the coil 51. In the embodiment, the fusing terminal 63 is connected to a wire 53 that protrudes radially inward from the coil 51. The fusing terminal 63 is connected to the coil 51 via a wire 53 that protrudes radially inward from the coil 51.

[0117] The fusing terminal 63 is supported by the support member 61. The fusing terminal 63 is disposed in the annular portion 611. A plurality of fusing terminals 63 are arranged around the rotation axis AX. In the axial direction, the positions of the plurality of fusing terminals 63 are substantially equal.

[0118] The number of fusing terminals 63 provided is the same as the number of coils 51. In the embodiment, six fusing terminals 63 are provided. The fusing terminals 63 include a pair of fusing terminals 63U, a pair of fusing terminals 63V, and a pair of fusing terminals 63W.

[0119] The short - circuit member 64 is supported by the support member 61. The short - circuit member 64 connects the external terminal 62 and the fusing terminal 63. At least a part of the short - circuit member 64 is disposed radially inside the coil 51. At least a part of the short - circuit member 64 is disposed radially outside the coil 51. The fusing terminal 63 and the short - circuit member 64 are integral. That is, the fusing terminal 63 and the short - circuit member 64 are a single member.

[0120] In a plane orthogonal to the rotation axis AX, the short - circuit member 64 is curved. The drive current input to the external terminal 62 is supplied to the coil 51 via the short - circuit member 64 and the fusing terminal 63.

[0121] The short - circuit member 64 includes a short - circuit member 64U that connects the U - phase external terminal 62U and each of the pair of fusing terminals 63U, a short - circuit member 64V that connects the V - phase external terminal 62V and each of the pair of fusing terminals 63V, and a short - circuit member 64W that connects the W - phase external terminal 62W and each of the pair of fusing terminals 63W. The fusing terminal 63U and the short - circuit member 64U are a single member. The fusing terminal 63V and the short - circuit member 64V are a single member. The fusing terminal 63W and the short - circuit member 64W are a single member.

[0122] The U-phase external terminal 62U is arranged at one end of the short-circuit member 64U. One of the fusing terminals 63U is arranged at the other end of the short-circuit member 64U. The other fusing terminal 63U is arranged at the middle part of the short-circuit member 64U. The middle part of the short-circuit member 64U refers to the part between one end and the other end of the short-circuit member 64U.

[0123] The V-phase external terminal 62V is arranged at one end of the short-circuit member 64V. One of the fusing terminals 63V is arranged at the other end of the short-circuit member 64V. The other fusing terminal 63V is arranged at the middle part of the short-circuit member 64V. The middle part of the short-circuit member 64V refers to the part between one end and the other end of the short-circuit member 64V.

[0124] The W-phase external terminal 62W is arranged at one end of the short-circuit member 64W. One of the fusing terminals 63W is arranged at the other end of the short-circuit member 64W. The other fusing terminal 63W is arranged at the middle part of the short-circuit member 64W. The middle part of the short-circuit member 64W refers to the part between one end and the other end of the short-circuit member 64W.

[0125] The rotation detection element 65 is supported by the support member 61. The rotation detection element 65 is arranged in 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 radially inside 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 based on the detection signal of the rotation detection element 65.

[0126] The signal terminal 66 is supported by the support member 61. The signal terminal 66 is arranged radially outside the coil 51. The signal terminal 66 is connected to the rotation detection element 65 via the signal line 67. At least a part of the signal line 67 is arranged radially inside the coil 51. At least a part of the signal line 67 is arranged radially outside the coil 51.

[0127] At least a part of the short - circuit member 64 is disposed inside the support member 61. At least a part of the signal line 67 is disposed inside the support member 61. Each of the short - circuit member 64 and the signal line 67 is molded with a synthetic resin. The terminal unit 60 includes a molded circuit part (MID: Molded Interconnect Device). By molding each of the short - circuit member 64 and the signal line 67 with a synthetic resin, at least a part of the short - circuit member 64 and at least a part of the signal line 67 are disposed inside the support member 61.

[0128] FIG. 18 is a perspective view showing a fusing terminal 63 according to an embodiment. As shown in FIG. 18, the fusing terminal 63 has a base portion 631, a connection portion 632, a first plate portion 633, a curved portion 634, and a second plate portion 635.

[0129] The base portion 631 is connected to the short - circuit member 64. Note that the base portion 631 may be regarded as at least a part of the short - circuit member 64.

[0130] The first plate portion 633 is disposed on one axial side of the base portion 631. The second plate portion 635 is disposed on one axial side of the first plate portion 633.

[0131] The connection portion 632 connects the radially inner end of the base portion 631 and the radially inner end of the first plate portion 633.

[0132] The curved portion 634 connects the radially outer end of the first plate portion 633 and the radially outer end of the second plate portion 635.

[0133] In the fusing 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 wire 53 can pass through the opening 636. The wire 53 is connected to the fusing terminal 63 while being disposed between the first plate portion 633 and the second plate portion 635.

[0134] [Relationship between Coil and Fusing Terminal] FIG. 19 is a perspective view showing the relationship between a coil 51 and a fusing terminal 63 according to an embodiment. The fusing terminal 63 includes a fusing terminal 63U, a fusing terminal 63V, and a fusing terminal 63W. Two fusing terminals 63U are provided. Two fusing terminals 63V are provided. Two fusing terminals 63W are provided.

[0135] The fusing terminal 63U is connected to each of the adjacent W-phase coil 51W and U-phase coil 51U in the circumferential direction. The fusing terminal 63V is connected to each of the adjacent U-phase coil 51U and V-phase coil 51V in the circumferential direction. The fusing terminal 63W is connected to each of the adjacent V-phase coil 51V and W-phase coil 51W in the circumferential direction.

[0136] The short-circuit member 64U connects the two fusing terminals 63U. The short-circuit member 64V connects the two fusing terminals 63V. The short-circuit member 64W connects the two fusing terminals 63W.

[0137] Two U-phase coils 51U are provided. A fusing terminal 63U is connected to one of the U-phase coils 51U. A fusing terminal 63V is connected to the other U-phase coil 51U.

[0138] Two V-phase coils 51V are provided. A fusing terminal 63V is connected to one of the V-phase coils 51V. A fusing terminal 63W is connected to the other V-phase coil 51V.

[0139] Two W-phase coils 51W are provided. A fusing terminal 63W is connected to one of the W-phase coils 51W. A fusing terminal 63U is connected to the other W-phase coil 51W.

[0140] One of the lug terminals 63U is connected to a wire 53W that protrudes radially inward from the W-phase coil 51W. The other lug terminal 63U is connected to a wire 53U that protrudes radially inward from the U-phase coil 51U.

[0141] One of the lug terminals 63V is connected to a wire 53U that protrudes radially inward from the U-phase coil 51U. The other lug terminal 63V is connected to a wire 53V that protrudes radially inward from the V-phase coil 51V.

[0142] One of the lug terminals 63W is connected to a wire 53V that protrudes radially inward from the V-phase coil 51V. The other lug terminal 63W is connected to a wire 53W that protrudes radially inward from the W-phase coil 51W.

[0143] The two U-phase coils 51U are connected via a jumper wire 52U.

[0144] The two V-phase coils 51V are connected via a jumper wire 52V.

[0145] The two W-phase coils 51W are connected via a jumper wire 52W.

[0146] Each of FIGS. 20, 21, and 22 is a diagram schematically showing an example of the flow state of the drive current according to the embodiment.

[0147] As shown in FIG. 20, when a U-phase drive current is input to the U-phase external terminal 62U, the U-phase drive current is supplied to each of one W-phase coil 51W and one U-phase coil 51U via the short-circuit member 64U and the fusing terminal 63U. Each of one W-phase coil 51W and one U-phase coil 51U is excited, for example, to the N pole. The U-phase drive current that has passed through one W-phase coil 51W is supplied to the other W-phase coil 51W via the jumper wire 52W. The U-phase drive current that has passed through one U-phase coil 51U is supplied to the other U-phase coil 51U via the jumper wire 52U. Each of the other W-phase coil 51W and the other U-phase coil 51U is excited, for example, to the S pole. The W-phase drive current that has passed through the other W-phase coil 51W is output from the W-phase external terminal 62W. The U-phase drive current that has passed through the other U-phase coil 51U is output from the V-phase external terminal 62V.

[0148] As shown in FIG. 21, when a V-phase drive current is input to the V-phase external terminal 62V, the V-phase drive current is supplied to each of one U-phase coil 51U and one V-phase coil 51V via the short-circuit member 64V and the fusing terminal 63V. Each of one U-phase coil 51U and one V-phase coil 51V is excited, for example, to the N pole. The V-phase drive current that has passed through one U-phase coil 51U is supplied to the other U-phase coil 51U via the jumper wire 52U. The V-phase drive current that has passed through one V-phase coil 51V is supplied to the other V-phase coil 51V via the jumper wire 52V. Each of the other U-phase coil 51U and the other V-phase coil 51V is excited, for example, to the S pole. The V-phase drive current that has passed through the other U-phase coil 51U is output from the U-phase external terminal 62U. The V-phase drive current that has passed through the other V-phase coil 51V is output from the W-phase external terminal 62W.

[0149] As shown in FIG. 22, when a W-phase drive current is input to the W-phase external terminal 62W, the W-phase drive current is supplied to each of one V-phase coil 51V and one W-phase coil 51W via the short-circuit member 64W and the fusing terminal 63W. Each of one V-phase coil 51V and one W-phase coil 51W is magnetized, for example, to the N pole. The W-phase drive current that has passed through one V-phase coil 51V is supplied to the other V-phase coil 51V via the jumper wire 52V. The W-phase drive current that has passed through one W-phase coil 51W is supplied to the other W-phase coil 51W via the jumper wire 52W. Each of the other V-phase coil 51V and the other W-phase coil 51W is magnetized, for example, to the S pole. The W-phase drive current that has passed through the other V-phase coil 51V is output from the V-phase external terminal 62V. The W-phase drive current that has passed through the other W-phase coil 51W is output from the U-phase external terminal 62U.

[0150] [Method of assembling stator] Next, a method of assembling the stator 20 according to the embodiment will be described. Each of FIGS. 23 to 27 is a diagram for explaining the method of assembling the stator 20 according to the embodiment.

[0151] As shown in FIG. 23, the terminal unit 60 is disposed on one axial side of the inner member 21 including the inner core 31 and the inner insulator 41. The support member 61 is disposed 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.

[0152] In the axial direction, the protruding portion 612 of the support member 61 is disposed adjacent to the tooth portion 36. That is, in the circumferential direction, the terminal unit 60 is disposed on one axial side of the inner member 21 such that the position of the protruding portion 612 coincides with the position of the tooth portion 36.

[0153] As shown in FIG. 23, at least a part 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 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 segment 33 and the inner surface of the connecting portion 41J.

[0154] In an embodiment, at least a part of the annular portion 611 of the support member 61 is disposed 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.

[0155] Also, at least a part of the housing terminal 63 is disposed radially inward of the inner surface 39 of the stator core 30.

[0156] As shown in FIG. 24, after the terminal unit 60 is disposed on one axial side of the inner member 21, the coil 51 is wound. The coil 51 is disposed so as to wind at least a part of the support member 61. The coil 51 is disposed so as to wind the tooth portion 36 and the protruding portion 612.

[0157] The coil 51 is disposed so as to wind the tooth portion 36 and the protruding portion 612 on the radially outer side of the annular portion 611. The annular portion 611 is disposed radially inward of the coil 51.

[0158] The coil 51 is wound by a winding machine. The coil 51 is wound around the tooth portion 36 and the protruding portion 612 in a specified winding method. Examples of the winding method of the coil 51 include a nozzle method or a flyer method. The winding machine has a nozzle capable of feeding the wire 53. When the coil 51 is wound around the tooth portion 36 and the protruding portion 612 by the nozzle method, the nozzle enters between the adjacent tooth portion 36 and the protruding portion 612 through the gap 43 and circulates around the tooth portion 36 and the protruding portion 612 while feeding the wire 53. In a state where the wire 53 is fed from the nozzle, the nozzle circulates around the tooth portion 36 and the protruding portion 612, whereby the coil 51 is provided around the tooth portion 36 and the protruding portion 612. The coil 51 and the inner core 31 including the tooth portion 36 are electrically insulated by the inner insulator 41.

[0159] Note that the winding method is not limited to the nozzle method and the flyer method.

[0160] As shown in FIG. 25, a jumper wire 52 connecting a plurality of coils 51 is disposed around a protruding portion 41T of the inner insulator 41. The protruding portion 41T protrudes axially to the other side from the covering portion 41D. The jumper wire 52 is disposed so as to wind around the protruding portion 41T. The plurality of jumper wires 52 are, for example, stacked axially.

[0161] As shown in FIG. 26, after the coil 51 is wound, the wire 53 and the fusing terminal 63 are connected by a fusing device 100. The wire 53 is disposed between the first plate portion 633 and the second plate portion 635 of the fusing terminal 63. The wire 53 is inserted between the first plate portion 633 and the second plate portion 635 through an opening 636.

[0162] The fusing device 100 has a first electrode 101 and a second electrode 102. The first electrode 101 is disposed above the fusing terminal 63. The second electrode 102 is disposed below the fusing terminal 63. The fusing terminal 63 is disposed radially inward of the inner surface 39 of the stator core 30. Therefore, the fusing device 100 can dispose the second electrode 102 disposed inside the stator core 30 below the fusing terminal 63.

[0163] With the wire 53 disposed between the first plate portion 633 and the second plate portion 635, the fusing device 100 presses the fusing terminal 63 with the first electrode 101 and the second electrode 102 so that the first plate portion 633 and the second plate portion 635 approach each other. Further, the fusing device 100 heats the fusing terminal 63 while pressing the fusing terminal 63 with the first electrode 101 and the second electrode 102. Thereby, the wire 53 and the fusing terminal 63 are connected by fusing.

[0164] The fusing device 100 has the same number of first electrodes 101 as the number of fusing terminals 63. The fusing device 100 has the same number of second electrodes 102 as the number of fusing terminals 63. The first electrodes 101 are disposed above each of the plurality of fusing terminals 63. The second electrodes 102 are disposed below each of the plurality of fusing terminals 63. In the axial direction, the positions of the plurality of fusing terminals 63 are equal. The fusing device 100 can simultaneously connect the plurality of fusing terminals 63 and the wire 53.

[0165] As shown in FIG. 27, the inner member 21 to which the coil 51 and the terminal unit 60 are attached is press-fitted axially into the outer member 22, whereby the inner member 21 and the outer member 22 are connected. The inner member 21 is press-fitted into the outer member 22 so that the protruding portion 38 of the outer member 22 fits into the gap 43 of the inner member 21. Thereby, the stator 20 is formed.

[0166] Note that the inner member 21 and the outer member 22 may be fixed by press-fitting, may be fixed by welding, or may be fixed by bolts.

[0167] [Effect] As described above, according to the embodiment, the fusing terminals 63 connected to the coil 51 are disposed radially inward of the coil 51. Therefore, the radial dimension of the stator 20 is reduced. Thereby, the size of the motor 8 can be reduced. Accordingly, the size of the power tool 1 can be reduced.

[0168] At least a part of the fusing terminals 63 is disposed radially inward of the inner surface 39 of the stator core 30. Conventionally, the space inside the stator core is often a dead space. According to the embodiment, at least a part of the fusing terminals 63 is disposed radially inward of the inner surface 39 of the stator core 30. According to the embodiment, the dead space is effectively utilized, and the size of the motor 8 can be reduced.

[0169] The fusing terminal 63 is connected to the coil 51 via a wire 53 that protrudes radially inward from the coil 51. Thereby, the fusing terminal 63 disposed radially inward of the coil 51 and the coil 51 are smoothly connected.

[0170] The fusing terminal 63 includes a first plate portion 633, a second plate portion 635 disposed on one axial side of the first plate portion 633, a curved portion 634 connecting the radially outer end of the first plate portion 633 and the radially outer end of the second plate portion 635, and an opening 636 defined between the radially inner end of the first plate portion 633 and the radially inner end of the second plate portion 635. The wire 53 is inserted between the first plate portion 633 and the second plate portion 635 through the opening 636. Thereby, the fusing device 100 can heat the fusing terminal 63 while pressing it using the first electrode 101 and the second electrode 102 disposed axially with the wire 53 disposed between the first plate portion 633 and the second plate portion 635.

[0171] A plurality of fusing terminals 63 are arranged around the rotation axis AX. In the axial direction, the positions of the plurality of fusing terminals 63 are equal. Thereby, the fusing device 100 can simultaneously connect the plurality of fusing terminals 63 and the wire 53.

[0172] At least a part of the support member 61 is disposed radially inward of the coil 51. Therefore, the support member 61 can properly support the fusing terminal 63. Also, since at least a part of the support member 61 is disposed radially inward of the coil 51, the radial dimension of the stator 20 is reduced. Thereby, the size of the motor 8 can be reduced.

[0173] At least a part of the support member 61 is disposed radially inward of the inner surface 39 of the stator core 30. Thereby, the dead space is effectively utilized and the size of the motor 8 can be reduced.

[0174] The support member 61 is disposed on one axial side of the stator core 30 and is supported by the stator core 30. Thereby, the axial dimension of the stator 20 is reduced. Therefore, the motor 8 can be miniaturized.

[0175] The coil 51 is disposed so as to wind at least a part of the support member 61. In the embodiment, the coil 51 is disposed so as to wind the tooth portion 36 and the protruding portion 612. The terminal unit 60 and the stator core 30 are fixed by the coil 51. Also, the axial dimension of the stator 20 is reduced.

[0176] The support member 61 supports not only the housing terminal 63 but also the short - circuit member 64. Therefore, the stator 20 can be miniaturized.

[0177] The housing terminal 63 and the short - circuit member 64 are integral. Therefore, the manufacturing process of the terminal unit 60 is simplified. Also, at least a part of the short - circuit member 64 and at least a part of the signal line 67 are disposed inside the support member 61. The terminal unit 60 includes a molded interconnect device (MID). Therefore, the terminal unit 60 can be miniaturized.

[0178] At least a part of the short - circuit member 64 is disposed radially inside the coil 51 and is connected to the housing terminal 63. At least a part of the short - circuit member 64 is disposed radially outside the coil 51 and is connected to the external terminal 62. The housing terminal 63, the external terminal 62, and at least a part of the short - circuit member 64 are disposed in a plane orthogonal to the rotation axis AX. Therefore, the axial dimension of the terminal unit 60 is reduced.

[0179] The support member 61 supports not only the housing terminal 63 and the short - circuit member 64 but also the rotation detection element 65. Therefore, the stator 20 can be miniaturized.

[0180] In the axial direction, the terminal unit 60 including the support member 61 is disposed between the center of the coil 51 and one end of the coil 51 on one side. That is, the terminal unit 60 is disposed at a position close to one end of the coil 51 in the axial direction so as not to protrude axially from the coil 51. Therefore, the axial dimension of the stator 20 is reduced.

[0181] In the axial direction, the jumper wire 52 is disposed between the center of the coil 51 and the other end of the coil 51 on the other side. That is, the jumper wire 52 is disposed at a position close to the other end of the coil 51 in the axial direction so as not to protrude axially from the coil 51. Therefore, the axial dimension of the stator 20 is reduced.

[0182] The stator 20 has an inner member 21 around which the coil 51 is wound and an outer member 22 disposed around the inner member 21. The inner member 21 includes a plurality of core segments 33 each having a tooth portion 36 around which the coil 51 is wound and an inner insulator 41 that connects the plurality of core segments 33. Since the plurality of core segments 33 are connected by the inner insulator 41, displacement of the relative positions of the plurality of tooth portions 36 is suppressed.

[0183] When winding the coil 51 around the tooth portion 36 and the protruding portion 612, the nozzle enters between the adjacent tooth portion 36 and protruding portion 612 through the gap 43 and circulates around the tooth portion 36 and the protruding portion 612. Since the interval between the adjacent tooth portion 36 and protruding portion 612 is large, sufficient space for the nozzle to move is ensured. Therefore, the operation of winding the coil 51 around the tooth portion 36 and the protruding portion 612 is efficiently performed. Further, the coil 51 is properly wound around the tooth portion 36 and the protruding portion 612 in an aligned state. Therefore, the filling factor of the coil 51 is improved.

[0184] The inner member 21 has a gap 43 into which the protruding portion 38 of the outer member 22 fits. Thereby, the inner member 21 and the outer member 22 are positioned with high precision and properly connected.

[0185] The jumper wire 52 is disposed around the protruding portion 41T of the inner insulator 41. Thereby, the jumper wire 52 is efficiently disposed.

[0186] [Other Embodiments] In the above-described embodiment, the power tool 1 is a vibration driver drill. The power tool 1 is not limited to a vibration driver drill. Examples of the power tool 1 include a driver drill, an angle drill, an impact driver, a grinder, a hammer, a hammer drill, a mallet, and a reciprocating saw.

[0187] In the above-described embodiment, the power-operated work machine is a power tool. The power-operated work machine is not limited to a power tool. Examples of the power-operated work machine include gardening tools. Examples of the gardening tools include a chainsaw, a hedge trimmer, a lawn mower, a grass cutter, and a blower.

[0188] In the above-described embodiment, the battery pack 11 attached to the battery attachment portion 7 is used as the power source of the power-operated work machine. A commercial power source (alternating current power source) may be used as the power source of the power-operated work machine.

Description of Reference Numerals

[0189] 1... Electric tool (electric working machine), 2... Grip housing, 3... Body housing, 3A... Intake port, 3B... Exhaust port, 4... Motor housing, 5... Gear housing, 6... Output shaft, 7... Battery mounting part, 8... Motor, 9... Rear cover, 10... Power transmission mechanism, 11... Battery pack, 12... Trigger switch, 13... Forward / reverse changeover lever, 14... Speed change lever, 15... Mode change ring, 16... Change ring, 17... Light, 18... Controller, 19... Rotor, 19S... Rotor shaft, 20... Stator, 21... Inner member, 22... Outer member, 30... Stator core, 31... Inner core, 32... Outer core, 32A... Inner surface, 32B... Outer surface, 32C... End face, 32D... End face, 32E... Inner surface, 32F... Side surface, 32G... Side surface, 33... Core segment, 33A... Inner surface, 33B... Outer surface, 33C... End face, 33D... End face, 33E... Opposite face, 33F... Opposite face, 33G... Side surface, 33H... Side surface, 33I... Side surface, 33J... Side surface, 34... Inner wall part, 34T... Protrusion, 35... Outer wall part, 35T... Protrusion, 36... Tooth part, 37... Cylindrical part, 38... Protrusion, 39... Inner surface, 40... Insulator, 41... Inner insulator, 41C... Coating part, 41D... Coating part, 41E... Coating part, 41F... Coating part, 41G... Coating part, 41H... Coating part, 41J... Connecting part, 41S... Space, 41T... Protrusion, 42... Outer insulator, 42C... Coating part, 42D... Coating part, 42E... Coating part, 43... Gap, 50... Coil unit, 51... Coil, 51U... U-phase coil, 51V... V-phase coil, 51W... W-phase coil, 52... Jumper wire, 52U... Jumper wire, 52V... Jumper wire, 52W... Jumper wire, 53... Wire, 53U... Wire, 53UE... Winding end part, 53US... Winding start part, 53V... Wire, 53VE... Winding end part, 53VS... Winding start part, 53W... Wire, 53WE... Winding end part, 53WS... Winding start part, 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... Fusing terminal, 63U... Fusing terminal, 63V... Fusing terminal, 63W... Fusing terminal, 64... Short-circuit member, 64U... Short-circuit member, 64V... Short-circuit member, 64W... Short-circuit member, 65... Rotation detection element, 66... Signal terminal, 67... Signal wire, 68... Recess, 69... Recess, 70... Support part, 71... Hole, 100... Fusing device, 101... First electrode102... The second electrode, 611... The annular part, 611A... The end face, 611B... The end face, 611C... The inner surface, 611D... The outer surface, 612... The protruding part, 612A... The end face, 612B... The end face, 613... The opening, 631... The base part, 632... The connecting part, 633... The first plate part, 634... The bending part, 635... The second plate part, 636... The opening, 6121... The first protruding part, 6122... The second protruding part, 6123... The third protruding part, 6124... The fourth protruding part, 6125... The fifth protruding part, 6126... The sixth protruding part.,

Claims

1. a motor having a stator and a rotor disposed inside the stator and rotatable around a rotation axis; an output shaft to which a tool bit is attached and which is driven based on power transmitted from the motor; The stator includes: a stator core having an annular core and at least three teeth portions engageable with the annular core on an inner diameter side, the number of teeth portions being a multiple of three; an insulating insulator arranged to cover at least a portion of a surface of the stator core; Three coils are wound around at least a portion of the three or more teeth portions (a multiple of three) via the insulator; and Three terminals disposed radially inward from the three coils and connected to the three coils; a U-layer external terminal, a V-layer external terminal, and a W-layer external terminal, each formed integrally with the three terminals; a support member for supporting the three terminals, the U-layer external terminal, the V-layer external terminal, and the W-layer external terminal; having Connection points between the coil and the three terminals are disposed radially inward from an inner surface of the teeth portion. Electric work equipment.

2. The support member has an annular portion and a protruding portion protruding radially outward from the annular portion, The electric operating machine according to claim 1 , wherein the coil is wound around the protruding portion.

3. a plurality of rotation detection elements for detecting rotation of the rotor; The electric operating machine according to claim 1 , wherein the plurality of rotation detection elements are arranged radially inward from the inner surface of the teeth portion.

4. The support member has a recess recessed from a radially inner surface to a radially outer surface, The electric operating machine according to claim 1 , wherein the three terminals are disposed inside the recesses of the support member.

5. 2. The electric operating machine according to claim 1, wherein the terminal has a member disposed on one side in the axial direction of the connected coil, and a member disposed on the other side in the axial direction of the connected coil.

6. The electric operating machine according to claim 1 , wherein the U-layer external terminal, the V-layer external terminal and the W-layer external terminal are each connected to a power source.

7. An electric work machine as described in claim 1, wherein the support member has at least a portion of an integral part between any one of the U-layer external terminal, the V-layer external terminal and the W-layer external terminal and the terminal formed integrally with the external terminal disposed inside.

8. a short-circuit member connecting the three terminals to any one of the U-layer external terminal, the V-layer external terminal, and the W-layer external terminal; The electric operating machine according to claim 1 , wherein the short-circuit member is disposed inside the support member.

9. a motor having a stator and a rotor disposed inside the stator and rotatable around a rotation axis; an output shaft to which a tool bit is attached and which is driven based on power transmitted from the motor; The stator includes: a stator core having an annular core and at least three teeth portions engageable with the annular core on an inner diameter side, the number of teeth portions being a multiple of three; an insulating insulator arranged to cover at least a portion of a surface of the stator core; Three coils are wound around at least a portion of the three or more teeth portions (a multiple of three) via the insulator; and Three terminals disposed radially inward from the three coils and connected to the three coils; a U-layer external terminal, a V-layer external terminal, and a W-layer external terminal, each formed integrally with the three terminals; a support member for supporting the three terminals, the U-layer external terminal, the V-layer external terminal, and the W-layer external terminal; having Connection points between the coil and the three terminals are disposed radially inward of an inner surface of the teeth portion, The three terminals are in contact with a recess formed in the support member on a surface opposite to a connection portion with the coil, The coil has a portion where it contacts the terminal extending in a circumferential direction. Electric work equipment.

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