Electric working machine

Abstract

The invention provides an electric working machine. The electric working machine includes: a motor including a rotor rotating about a rotation axis and a stator disposed around the rotor; the sensor substrate has a rotation sensor that detects rotation of the rotor, and a plate member that supports the rotation sensor. The stator is provided with a stator core, an insulator and a plurality of coils, and the stator core is arranged around the rotor; the insulator is fixed to the stator core. The plurality of coils are fixed to the insulator and are arranged at intervals in the circumferential direction. The plate member has: an arc portion that is disposed at a part of the periphery of the rotating shaft and that has an opposing surface that faces the axial end surface of the rotor; the at least two arm portions protrude radially outward from the arc portion and are fixed to the insulator. The rotation sensor is disposed on the facing surface. Therefore, the sensor substrate of the electric working machine can be miniaturized and lightened.

Description

Technical Field

[0001] The invention disclosed in this specification relates to an electric working machine. Background of the Invention

[0002] In the technical field related to electric working machines, an electric working machine including a motor and a sensor substrate as disclosed in Patent Document 1 is known. [Prior art literature] [Patent Document]

[0003] Patent Document 1: Japanese Patent Publication No. 2022-012822 Summary of the invention [Technical problem to be solved by the invention]

[0004] When the electric working machine is enlarged, the operator using the electric working machine may have difficulty in using the electric working machine smoothly. Therefore, the electric working machine is required to be miniaturized and lightweight. In the case where the electric working machine has a sensor substrate, miniaturization and lightweighting of the sensor substrate contribute to miniaturization and lightweighting of the electric working machine.

[0005] An object of the invention disclosed in this specification is to reduce the size and weight of a sensor substrate of an electric working machine. [Technical solutions for solving technical problems]

[0006] The present specification discloses an electric working machine. The electric working machine may include a motor and a sensor substrate, wherein the motor includes a rotor rotating around a rotation axis and a stator arranged around the rotor; the sensor substrate includes a rotation sensor for detecting the rotation of the rotor and a plate member for supporting the rotation sensor. The stator may include a stator core, an insulator, and a plurality of coils, wherein the stator core is arranged around the rotor; the insulator is fixed to the stator core; the plurality of coils are fixed to the insulator and arranged at intervals in the circumferential direction. The plate member may include an arc portion and at least two arm portions, wherein the arc portion is arranged at a portion around the rotation axis and has a facing surface facing the axial end surface of the rotor; at least two arm portions protrude radially outward from the arc portion and are fixed to the insulator. The rotation sensor may be arranged on the facing surface. [Effects of the invention]

[0007] According to the invention disclosed in this specification, the sensor substrate of the electric working machine can be reduced in size and weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a side view showing the electric working machine according to the first embodiment. Figure 2 It is an exploded perspective view showing a motor assembly according to the first embodiment, as seen from the front. Figure 3 It is a perspective view showing the stator and the sensor substrate according to the first embodiment, as seen from the rear. Figure 4 This is a diagram showing the stator and the sensor substrate according to the first embodiment as seen from the front. Figure 5 This is a diagram showing the stator according to the first embodiment as viewed from the front. Figure 6 This is a diagram showing the stator and the sensor substrate according to the first embodiment as seen from the rear. Figure 7 This is a diagram showing the stator and the sensor substrate according to the first embodiment as seen from the left side. Figure 8 It is a cross-sectional view showing a stator and a sensor substrate according to the first embodiment. Fig. 9 It is an exploded perspective view showing the stator and the sensor substrate according to the first embodiment, as seen from the front. Fig.10 This is a diagram showing a stator and a sensor substrate according to a second embodiment when viewed from the front. Fig.11 This is a diagram showing a stator according to a second embodiment as viewed from the front. Fig.12 This is a diagram showing a stator and a sensor substrate according to a second embodiment when viewed from the left side. Fig.13 It is a cross-sectional view showing a stator and a sensor substrate according to a second embodiment. Fig.14 This is a diagram showing a stator and a sensor substrate according to a third embodiment when viewed from the front. Fig.15 This is a diagram showing a stator according to a third embodiment as viewed from the front. Fig.16 This is a diagram showing a stator and a sensor substrate according to a third embodiment when viewed from the left side. Fig.17 It is a cross-sectional view showing a stator and a sensor substrate according to a third embodiment. Fig.18 It is an exploded perspective view showing a stator and a sensor substrate according to a third embodiment, as seen from the front. Fig.19 It is a cross-sectional view showing a stator and a sensor substrate according to a third embodiment. Fig. 20This is a diagram showing a stator and a sensor substrate according to a fourth embodiment when viewed from the front. Fig.21 This is a diagram showing a stator according to a fourth embodiment as viewed from the front. Fig. 22 This is a diagram showing a stator and a sensor substrate according to a fourth embodiment when viewed from the left side. Fig.23 It is a cross-sectional view showing a stator and a sensor substrate according to a fourth embodiment. Fig.24 This is a diagram showing a stator and a sensor substrate according to a fifth embodiment as seen from the front. Fig.25 This is a diagram showing a stator and a sensor substrate according to a fifth embodiment as viewed from the left side. Fig.26 It is a cross-sectional view showing a stator and a sensor substrate according to a fifth embodiment. Fig. 27 This is a diagram showing a stator and a sensor substrate according to the sixth embodiment as viewed from the front. Fig.28 This is a diagram showing a stator and a sensor substrate according to the sixth embodiment as viewed from the left side. Fig.29 It is a cross-sectional view showing a stator and a sensor substrate according to a sixth embodiment. Fig.30 This is a diagram showing a stator and a sensor substrate according to the seventh embodiment as viewed from the front. Fig.31 This is a diagram showing a stator and a sensor substrate according to the seventh embodiment as viewed from the left side. Fig.32 It is a cross-sectional view showing a stator and a sensor substrate according to the seventh embodiment. Fig.33 This is a diagram showing a stator and a sensor substrate according to the eighth embodiment as viewed from the front. Fig.34 This is a diagram showing a stator and a sensor substrate according to the eighth embodiment as viewed from the left side. Fig.35 It is a cross-sectional view showing a stator and a sensor substrate according to the eighth embodiment. Fig.36 This is a diagram showing a stator and a sensor substrate according to a ninth embodiment as viewed from the front. Fig.37 It is a diagram for explaining the relationship between the facing surface and the reverse surface according to the tenth embodiment, and the front end portion of the coil. Fig.38 This is a diagram showing a stator and a sensor substrate according to the eleventh embodiment as seen from the front. Fig.39 It is an exploded perspective view showing a stator and a sensor substrate according to the eleventh embodiment, as seen from the front. Fig.40 It is a cross-sectional view showing a stator and a sensor substrate according to the eleventh embodiment. Fig.41 It is a perspective view showing a portion of the sensor substrate according to the eleventh embodiment that is covered by a covering portion. [Explanation of Reference Numerals] 1: Electric working machine; 2: Housing; 3: Rear cover; 4: Gear box; 5: Battery mounting part; 6: Motor assembly; 7: Power transmission mechanism; 8: Spindle; 8C: Clamping mechanism; 9: Controller; 10: Trigger switch; 11: Forward and reverse switching lever; 12: Speed ​​switching lever; 13: Mode change ring; 14: Change ring; 15: Light source; 16: Motor housing; 17: Grip; 18: Controller housing; 19: Battery pack; 20: Motor; 21: Fan; 22A: Sensor substrate; 22B: Sensor substrate; 22C: Sensor substrate; 22D: Sensor substrate; 22E: Sensor substrate; 22F: Sensor substrate; 23: Rotor; 24: Stator; 25: Air inlet; 26: Exhaust port; 27: Rotor core; 27F: End surface; 27R: End surface; 27S: Outer surface; 28: rotor shaft; 29: permanent magnet; 30: magnet hole; 31: resin; 32: recess; 33: stator core; 34: insulator; 34F: front insulator; 34R: rear insulator; 35: coil; 35F: front end; 36: short-circuit component; 37: yoke; 37F: end face; 37R: end face; 38: tooth; 39: power terminal; 40: threaded opening; 41: inner coil stopper; 42: outer coil stopper; 43: threaded boss; 44: Inner coil stopper; 45: Outer coil stopper; 46: Threaded hole; 47: Terminal support; 48: Ring; 49: Ring; 50: Threaded opening; 51: Screw (second screw); 52: Screw; 53: Threaded opening; 54: Screw (first screw); 60: Rotation sensor; 70: Plate member; 71: Arc portion; 71A: Facing surface; 71B: Reverse surface; 72: Arm; 73: Cover; 74: Bridge; 75: Outer arc portion; 80: Signal line; 9 0: supporting member; 91: recess; 92: threaded boss portion; 92R: end face; 93: threaded opening; 94: supporting arc portion; 111: positioning hole; 112: positioning pin; 143: threaded boss portion; 153: threaded opening; 134: guide rib; 136: notch portion; 171: central portion; 172: a convex portion; 173: another convex portion; 175: covering portion; 721: first arm portion; 722: second arm portion; 723: third arm portion; D1: distance; D2: distance. DETAILED DESCRIPTION

[0009] In one or more embodiments, the electric working machine may include a motor and a sensor substrate, wherein the motor includes a rotor rotating around a rotation axis and a stator arranged around the rotor; the sensor substrate includes a rotation sensor for detecting the rotation of the rotor and a plate member for supporting the rotation sensor. The stator may include a stator core, an insulator, and a plurality of coils, wherein the stator core is arranged around the rotor; the insulator is fixed to the stator core; the plurality of coils are fixed to the insulator and arranged at intervals in the circumferential direction. The plate member may include an arc portion and at least two arm portions, wherein the arc portion is a portion arranged around the rotation axis and has a facing surface facing the axial end surface of the rotor; at least two arm portions protrude radially outward from the arc portion and are fixed to the insulator. The rotation sensor may be arranged on the facing surface.

[0010] In the above structure, a part of the plate member of the sensor substrate is an arc portion, so the sensor substrate is miniaturized and lightweight. Since a part of the plate member fixed to the insulator is an arm portion, the sensor substrate is miniaturized and lightweight. By miniaturizing and lightweighting the sensor substrate, the motor assembly including the motor and the sensor substrate is miniaturized and lightweight. Accordingly, the electric working machine is miniaturized and lightweight. In addition, a plurality of plate members are manufactured from a rectangular printed wiring board (PWB: Printed Wiring Board).

[0011] In one or more embodiments, the arc portion may be arranged radially inward of the coil.

[0012] In the above structure, the motor assembly is miniaturized in the radial direction.

[0013] In one or more embodiments, the radially outer end of the arm portion may be arranged radially outward of the coil. The end of the arm portion may be fixed to the insulator.

[0014] In the above structure, the sensor substrate is fixed to the insulator by fixing the end of the arm portion to the insulator.

[0015] In one or more embodiments, the facing surface may be arranged at a position closer to the center of the coil than to one end portion of the coil in the axial direction.

[0016] In the above structure, since at least a part of the arc portion enters the radial inner side of the coil, the motor assembly is miniaturized in the axial direction.

[0017] In one or more embodiments, the arc portion may have a reverse surface facing in the opposite direction of the facing surface. The reverse surface may be arranged at a position closer to the center of the coil than one end of the coil in the axial direction.

[0018] In the above structure, since the entire arc portion enters the radial inner side of the coil, the motor assembly is miniaturized in the axial direction.

[0019] In one or more embodiments, the plate member may be a parallel flat plate.

[0020] In the above structure, the board member is manufactured from a printed wiring board (PWB: Printed Wiring Board).

[0021] In one or more embodiments, the arm portion may be arranged between a pair of coils adjacent to each other.

[0022] In the above configuration, even if the plate member is a parallel flat plate, at least a portion of the arc portion enters the radially inner side of the coil.

[0023] In one or more embodiments, the arm portion may include a first arm portion and a second arm portion. The first arm portion may protrude radially outward from one circumferential end of the arc portion, and the second arm portion may protrude radially outward from the other circumferential end of the arc portion.

[0024] In the above structure, the end portion of the circular arc portion in the circumferential direction is suppressed from bending or vibrating.

[0025] In one or more embodiments, the plate member may include a bridge portion connecting a radially outer end portion of the first arm portion and a radially outer end portion of the second arm portion.

[0026] In the above structure, the strength of the plate member is improved.

[0027] In one or more embodiments, the bridge portion may be disposed at a portion around the rotation axis and may be in an arc shape.

[0028] In the above structure, the motor assembly is prevented from increasing in size in the radial direction.

[0029] In one or more embodiments, the electric working machine may include a controller and a signal line, wherein the controller controls the driving current supplied to the coil according to the detection signal of the rotation sensor, and the signal line connects the rotation sensor and the controller. The signal line may be supported by the bridge portion.

[0030] In the above structure, the signal line is supported by the bridge portion of the plate member.

[0031] In one or more embodiments, the arm portion may include a third arm portion. The third arm portion may protrude radially outward from a circumferential center portion of the arc portion.

[0032] In the above structure, the sensor substrate is firmly fixed to the insulator by fixing the first arm portion, the second arm portion, and the third arm portion to the insulator respectively.

[0033] In one or more embodiments, the electric working machine may include a controller and a signal line, wherein the controller controls the driving current supplied to the coil according to the detection signal of the rotation sensor, and the signal line connects the rotation sensor and the controller. The signal line may be supported by the third arm.

[0034] In the above structure, the signal line is supported by the third arm portion of the plate member.

[0035] In one or more embodiments, the electric working machine may include a power terminal through which the drive current flows, and the third arm may be arranged to overlap the power terminal in a plane perpendicular to the rotation axis.

[0036] In the above structure, the motor assembly is prevented from increasing in size in the radial direction.

[0037] In one or more embodiments, at least one of the first arm portion, the second arm portion, and the third arm portion may be fixed to the insulator by a screw.

[0038] In the above structure, the sensor substrate can be easily replaced with a new sensor substrate by removing the screws.

[0039] In one or more embodiments, the plate member may include a cover portion that connects an end portion of the first arm portion, an end portion of the second arm portion, and an end portion of the third arm portion on the radially outer side.

[0040] In the above structure, the strength of the plate member is improved.

[0041] In one or more embodiments, the electric working machine may include a controller and a signal line, wherein the controller controls the driving current supplied to the coil according to the detection signal of the rotation sensor, and the signal line connects the rotation sensor and the controller. The signal line may be supported by the cover.

[0042] In the above structure, the signal line is supported by the cover portion of the plate member.

[0043] In one or more embodiments, the electric working machine may include a power terminal through which a driving current flows, and the cover may be arranged to overlap the power terminal in a plane perpendicular to the rotation axis.

[0044] In the above structure, the motor assembly is prevented from increasing in size in the radial direction.

[0045] In one or more embodiments, the electric working machine may include a support member, and the support member may be fixed to the insulator. At least two arms may be fixed to the insulator via the support member.

[0046] In the above structure, the plate member is fixed to the insulator via the support member. Even if the plate member is a parallel flat plate, the plate member and the insulator are appropriately fixed via the support member by adjusting the shape of the support member.

[0047] In one or more embodiments, the support member may include a support arc portion and a threaded boss portion, wherein the support arc portion is fixed to the insulator by a first screw; the threaded boss portion is arranged at a position radially inward of the support arc portion, and the arm portion is fixed by a second screw. In the axial direction, the end face of the threaded boss portion facing the same direction as the facing surface may be arranged at a position closer to the center of the coil than the end face of the stator core facing the direction opposite to the facing surface.

[0048] In the above structure, the plate member is stably fixed to the insulator through the support member. The threaded boss portion is arranged at a position closer to the radial inside than the supporting arc portion, and therefore, the length of the threaded boss portion is not restricted. In the case where the plate member is arranged at a position closer to the center of the coil than one end of the coil, when the plate member is fixed to the insulator by the second screw, if the second screw is longer, the top end of the second screw may contact the end face of the stator core, and therefore the second screw may need to be shortened. In the case where the second screw is short, the fixation of the plate member and the insulator may become unstable. In the present embodiment, since the length of the threaded boss portion is not restricted, a long second screw can be used even when the plate member is arranged at a position closer to the center of the coil than one end of the coil. Therefore, the plate member is stably fixed to the insulator through the support member.

[0049] Hereinafter, the embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited to the embodiments. The structural elements of the embodiments described below can be combined as appropriate. In addition, there is also a case where some structural elements are not used.

[0050] In the embodiments, the terms “left”, “right”, “front”, “rear”, “upper”, and “lower” are used to describe the positional relationship of each part. These terms indicate relative positions or directions with respect to the center of the electric working machine.

[0051] The electric working machine has a motor. 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. The direction around the rotation axis AX of the motor is appropriately referred to as the circumferential direction or the rotation direction.

[0052] The position on one side of the axial direction or the direction on one side is appropriately referred to as the axial side, and the position on the other side of the axial direction or the direction on the other side is appropriately referred to as the axial other side. In an embodiment, the rotation axis AX of the motor extends in the front-to-back direction. The axial direction and the front-to-back direction are parallel. The axial side is the front side, and the axial other side is the rear side.

[0053] In the radial direction, a position closer to the rotation axis AX of the motor or a direction close to the rotation axis AX of the motor is appropriately referred to as the radial inside, and a position farther from the rotation axis AX of the motor or a direction away from the rotation axis AX of the motor is appropriately referred to as the radial outside.

[0054] The position or direction of one side in the circumferential direction is appropriately referred to as one side in the circumferential direction, and the position or direction of the other side in the circumferential direction is appropriately referred to as the other side in the circumferential direction. The one side in the circumferential direction is the forward rotation side, and the other side in the circumferential direction is the reverse rotation side.

[0055] [First embodiment] <Electric working machine> The first embodiment will be described. Figure 1 1 is a side view showing an electric working machine 1 according to the present embodiment. In the present embodiment, the electric working machine 1 is a vibration driver drill as a type of electric tool. Figure 1 As shown, the electric working machine 1 has a housing 2, a rear cover 3, a gear box 4, a battery mounting portion 5, a motor assembly 6, a power transmission mechanism 7, a main shaft 8, a controller 9, a trigger switch 10, a forward and reverse switching lever 11, a speed switching lever 12, a mode switching ring 13, a switching ring 14 and a light source 15.

[0056] The housing 2 has a motor housing portion 16, a grip portion 17, and a controller housing portion 18. The housing 2 is made of synthetic resin.

[0057] The motor housing portion 16 houses at least a portion of the motor assembly 6. The motor housing portion 16 is cylindrical.

[0058] The grip portion 17 is gripped by an operator who uses the electric working machine 1. The grip portion 17 protrudes downward from the lower portion of the motor housing portion 16.

[0059] The controller housing portion 18 houses the controller 9. The controller housing portion 18 is connected to the lower end portion of the grip portion 17. The dimensions of the controller housing portion 18 are larger than those of the grip portion 17 in the front-rear direction and the left-right direction.

[0060] The rear cover 3 is connected to the rear portion of the motor housing portion 16 so as to cover the opening of the rear portion of the motor housing portion 16. The rear cover 3 is made of synthetic resin.

[0061] The gear box 4 is connected to the front part of the motor housing portion 16. The gear box 4 houses at least a part of the power transmission mechanism 7. The gear box 4 is cylindrical. The gear box 4 is made of metal.

[0062] The battery mounting portion 5 is provided at the lower portion of the controller housing portion 18 of the housing 2. The battery pack 19 is mounted on the battery mounting portion 5. The battery pack 19 is detachable from the battery mounting portion 5. The battery pack 19 includes a secondary battery. In the present embodiment, the battery pack 19 includes a rechargeable lithium-ion battery. The battery pack 19 functions as a power supply unit of the electric working machine 1. The battery pack 19 is mounted on the battery mounting portion 5, thereby being able to supply electric power to the electric working machine 1.

[0063] The motor assembly 6 includes a motor 20, a fan 21, and a sensor substrate 22A. The motor 20 is a power source of the electric working machine 1. The motor 20 includes a rotor 23 and a stator 24. The rotor 23 rotates around a rotation axis AX. The fan 21 generates an airflow for cooling the motor 20. The fan 21 rotates by the rotational force generated by the motor 20. The sensor substrate 22A detects the rotation of the rotor 23. The detection signal of the sensor substrate 22A is output to the controller 9.

[0064] The motor housing portion 16 has an air inlet 25. The rear cover 3 has an exhaust port 26. The exhaust port 26 is arranged at a position rearward of the air inlet 25. The air inlet 25 connects the internal space and the external space of the housing 2. The exhaust port 26 connects the internal space and the external space of the housing 2. The air inlet 25 is respectively arranged at the left and right parts of the motor housing portion 16. The exhaust port 26 is respectively arranged at the left and right parts of the rear cover 3. As the fan 21 rotates, the air in the external space of the housing 2 flows into the internal space of the housing 2 through the air inlet 25. The air flowing into the internal space of the housing 2 cools the motor 20. The air in the internal space of the housing 2 flows out to the external space of the housing 2 through the exhaust port 26.

[0065] The power transmission mechanism 7 transmits the rotational force generated by the motor 20 to the main shaft 8. The power transmission mechanism 7 includes a plurality of gears.

[0066] The spindle 8 rotates based on the rotational force of the motor 20 transmitted by the power transmission mechanism 7. The spindle 8 rotates around the rotation axis AX. The spindle 8 has an insertion hole for inserting a top tool. A clamping mechanism 8C for holding the top tool is provided at least partially around the spindle 8. The top tool is held by the clamping mechanism 8C in a state where it is inserted into the insertion hole of the spindle 8.

[0067] The controller 9 controls the motor 20. The controller 9 controls the driving current supplied from the battery pack 19 to the motor 20 according to the detection signal of the sensor substrate 22A. The controller 9 is accommodated in the controller accommodation portion 18. The controller 9 includes a substrate on which a plurality of electronic components are mounted. As the electronic components mounted on the substrate, a processor such as a CPU (Central Processing Unit), a non-volatile memory such as a RON (Read Only Memory) or a memory, a volatile memory such as a RAM (Random Access Memory), a field effect transistor (FET: Field Effect Transistor) and a resistor are shown.

[0068] The trigger switch 10 is operated by the operator to drive the motor 20. The trigger switch 10 is provided at the upper part of the grip portion 17. The trigger switch 10 protrudes forward from the upper part of the front part of the grip portion 17. The trigger switch 10 is operated by the operator in a manner of moving backward. The operator can move the trigger switch 10 backward with, for example, the index finger. The trigger switch 10 generates an operation signal by being operated by the operator. The operation signal of the trigger switch 10 is input to the controller 9. The controller 9 drives the motor 20 according to the operation signal of the trigger switch 10. The motor 20 stops by releasing the operation of the trigger switch 10. The operator can stop the motor 20 by, for example, stopping moving the trigger switch 10 backward with the index finger.

[0069] The forward / reverse switching lever 11 is operated by the operator to switch the rotation direction of the motor 20 between the forward direction and the reverse direction. The forward / reverse switching lever 11 is disposed at the boundary between the lower end of the motor housing portion 16 and the upper end of the grip portion 17. The forward / reverse switching lever 11 is operated by the operator in a manner of moving to the left or right. By moving the forward / reverse switching lever 11 to the left or right, the rotation direction of the motor 20 is switched. By switching the rotation direction of the motor 20, the rotation direction of the spindle 8 is switched.

[0070] The speed switching lever 12 is operated by the operator to switch the rotation speed of the spindle 8 between the first speed and the second speed. The speed switching lever 12 is provided at the upper portion of the motor housing portion 16. The speed switching lever 12 is operated by the operator in a manner of moving forward or backward. By moving the speed switching lever 12 forward or backward, the rotation speed of the motor 20 is switched.

[0071] The mode switching ring 13 is operated by the operator to switch the working mode of the electric working machine 1. The mode switching ring 13 is arranged in a position forward of the gear box 4. The mode switching ring 13 is operated by the operator to rotate. The working mode of the electric working machine 1 includes a vibration mode in which the main shaft 8 vibrates in the axial direction and a non-vibration mode in which the main shaft 8 does not vibrate in the axial direction. The non-vibration mode includes: a drilling mode in which power is transmitted along the main shaft 8 regardless of the rotational load acting on the main shaft 8; and a clutch mode in which the power transmitted along the main shaft 8 is cut off based on the rotational load acting on the main shaft 8.

[0072] The switch ring 14 is operated by the operator to set a release value for cutting off the power transmitted along the main shaft 8. The switch ring 14 is arranged in a position forward of the mode switch ring 13. The switch ring 14 is operated by the operator in a rotating manner. The release value is a value related to the rotational load acting on the main shaft 8. When the rotational load acting on the main shaft 8 reaches the release value, the power transmitted to the main shaft 8 is cut off.

[0073] The light source 15 emits illumination light for illuminating the front of the electric working machine 1 . The light source 15 includes a light emitting diode (LED). The light source 15 is provided at an upper portion of the front portion of the grip portion 17 .

[0074] <Motor assembly> Figure 2 1 is an exploded perspective view showing the motor assembly 6 according to the present embodiment, as seen from the front. The motor assembly 6 includes a motor 20, a fan 21, and a sensor substrate 22A.

[0075] The motor 20 is driven based on electric power supplied from the battery pack 19. The motor 20 generates a rotational force for rotating the main shaft 8.

[0076] The motor 20 includes a rotor 23 and a stator 24. The rotor 23 rotates relative to the stator 24. In the present embodiment, the motor 20 is an inner rotor type brushless motor. The stator 24 is arranged around the rotor 23. The rotor 23 rotates around the rotation axis AX.

[0077] The rotor 23 includes a rotor core 27 , a rotor shaft 28 , and permanent magnets 29 .

[0078] The rotor core 27 includes a plurality of stacked steel plates. The steel plates are plates made of metal having iron as a main component. The rotor core 27 is arranged around the rotation axis AX. The rotor core 27 has an end face 27F facing the front side, an end face 27R facing the rear side, and an outer surface 27S facing the radial outside.

[0079] The rotor shaft 28 extends in the axial direction. The rotor shaft 28 is arranged inside the rotor core 27. The rotor core 27 and the rotor shaft 28 are fixed. The front portion of the rotor shaft 28 protrudes from the end surface 27F of the rotor core 27 to the front side. The rear portion of the rotor shaft 28 protrudes from the end surface 27R of the rotor core 27 to the rear side. The front portion of the rotor shaft 28 is rotatably supported by a front bearing not shown. The rear portion of the rotor shaft 28 is rotatably supported by a rear bearing not shown. The front end portion of the rotor shaft 28 is connected to the power transmission mechanism 7.

[0080] The permanent magnet 29 is supported by the rotor core 27. In the present embodiment, four permanent magnets 29 are arranged around the rotation axis AX. The rotor core 27 and the permanent magnets 29 are fixed. As the permanent magnet 29, a neodymium iron boron magnet is exemplified. The permanent magnet 29 is plate-shaped. The permanent magnet 29 is arranged inside the rotor core 27. The motor 20 is an interior permanent magnet (IPM: Interior Permanent Magnet) motor. The rotor core 27 has a magnet hole 30. The magnet hole 30 extends in the axial direction. The permanent magnet 29 is arranged in the magnet hole 30. The gap between the outer surface of the permanent magnet 29 and the inner surface of the magnet hole 30 is filled with resin 31.

[0081] A recess 32 is formed on the outer surface 27S of the rotor core 27. The recess 32 extends in the axial direction. The front end of the recess 32 is connected to the end surface 27F of the rotor core 27. The rear end of the recess 32 is connected to the end surface 27R of the rotor core 27. A plurality of recesses 32 are provided on the outer surface 27S of the rotor core 27. In the present embodiment, four recesses 32 are provided around the rotation axis AX. The plurality of recesses 32 are arranged at equal intervals in the circumferential direction. The recess 32 is provided to suppress noise generated by the rotation of the rotor core 27. In addition, the recess 32 may be omitted.

[0082] The fan 21 generates airflow for cooling the motor 20. The fan 21 is arranged at a position on the rear side of the stator 24 and the rotor core 27. The fan 21 is fixed to the rear of the rotor shaft 28. At least a part of the fan 21 is arranged at a position facing the end surface 27R of the rotor core 27. The fan 21 is rotated by the rotational force generated by the motor 20. When the rotor shaft 28 rotates, the fan 21 rotates together with the rotor shaft 28.

[0083] Figure 3 It is a perspective view showing the stator 24 and the sensor substrate 22A according to the present embodiment, as seen from the rear. Figure 4 This is a diagram showing the stator 24 and the sensor substrate 22A according to the present embodiment as seen from the front. Figure 5 This is a diagram of the stator 24 according to the present embodiment as viewed from the front. Figure 5In FIG. 1 , the sensor substrate 22A is indicated by an imaginary line. Figure 6 This is a diagram showing the stator 24 and the sensor substrate 22A according to the present embodiment as seen from the rear. Figure 7 This is a diagram showing the stator 24 and the sensor substrate 22A according to the present embodiment as viewed from the left side. Figure 8 It is a cross-sectional view showing the stator 24 and the sensor substrate 22A according to the present embodiment. Fig. 9 It is an exploded perspective view showing the stator 24 and the sensor substrate 22A according to the present embodiment, as seen from the front.

[0084] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 As shown, the stator 24 has a stator core 33 , an insulator 34 , a coil 35 , and a short-circuit element 36 .

[0085] The stator core 33 includes a plurality of stacked steel plates. The steel plate is a plate made of a metal having iron as a main component. The stator core 33 is arranged around the rotor core 27 of the rotor 23.

[0086] The stator core 33 has a yoke 37 and a tooth 38. The yoke 37 is arranged around the rotation axis AX. The yoke 37 is cylindrical. The tooth 38 protrudes radially inward from the inner circumference of the yoke 37. A plurality of teeth 38 are provided along the circumferential direction. In the present embodiment, six teeth 38 are provided. The plurality of teeth 38 are arranged at intervals along the circumferential direction.

[0087] The insulator 34 is an electrical insulating component made of a synthetic resin. The insulator 34 is fixed to the stator core 33. The insulator 34 is configured to cover at least a portion of the surface of the stator core 33. In the present embodiment, the insulator 34 includes a front insulator 34F fixed to the front of the stator core 33 and a rear insulator 34R fixed to the rear of the stator core 33. The front insulator 34F is configured to cover the end face 37F of the yoke 37 facing the front side and the surface on the front side of the tooth 38. The rear insulator 34R is configured to cover the end face 37R of the yoke 37 facing the rear side and the surface on the rear side of the tooth 38.

[0088] The coil 35 is fixed to the insulator 34. The coil 35 is wound around the plurality of teeth 38 via the insulator 34. A plurality of coils 35 are provided at intervals in the circumferential direction. In the present embodiment, six coils 35 are provided.

[0089] The front insulator 34F has an annular portion 48 and a terminal support portion 47 protruding downward from the lower portion of the annular portion 48. The annular portion 48 is provided with an inner coil stopper 41, an outer coil stopper 42 and a threaded boss portion 43. The terminal support portion 47 is provided with a threaded hole 46. The rear insulator 34R has an annular portion 49. The annular portion 49 is provided with an inner coil stopper 44 and an outer coil stopper 45.

[0090] The annular portion 48 is configured in a manner covering the end surface 37F of the yoke 37. The inner coil stopper 41 is connected to the annular portion 48. The inner coil stopper 41 is configured at a position radially inward of the coil 35. The inner coil stopper 41 supports the coil 35 from the radial inside. The outer coil stopper 42 protrudes from the annular portion 48 toward the front side. The outer coil stopper 42 is configured at a position radially outward of the coil 35. The outer coil stopper 42 supports the coil 35 from the radial outside.

[0091] The threaded boss portion 43 has a threaded hole. The threaded boss portion 43 protrudes from the annular portion 48 toward the front side. Two threaded boss portions 43 are provided. One threaded boss portion 43 is provided at the lower left portion of the annular portion 48. The other threaded boss portion 43 is provided at the lower right portion of the annular portion 48. The threaded hole 46 is provided in the terminal support portion 47. Three threaded holes 46 are provided. The three threaded holes 46 are arranged in the left-right direction.

[0092] The annular portion 49 is configured in a manner covering the end surface 37R of the yoke 37. The inner coil stopper 44 is connected to the annular portion 49. The inner coil stopper 44 is configured at a position radially inward of the coil 35. The inner coil stopper 44 supports the coil 35 from the radial inside. The outer coil stopper 45 protrudes from the annular portion 49 to the rear side. The outer coil stopper 45 is configured at a position radially outward of the coil 35. The outer coil stopper 45 supports the coil 35 from the radial outside.

[0093] The plurality of coils 35 are formed by winding one wire. The coils 35 adjacent to each other in the circumferential direction are connected by a connecting wire which is a part of the wire. The connecting wire is supported by the insulator 34 .

[0094] The six coils 35 are respectively allocated to any one of the U (UV) phase, the V (VW) phase, and the W (WU) phase. Two coils 35 of the six coils 35 are U-phase coils allocated to the U phase, two coils 35 are V-phase coils allocated to the V phase, and two coils 35 are W-phase coils allocated to the W phase.

[0095] The short-circuit component 36 is a conductive component. The driving current from the battery pack 19 is supplied to the short-circuit component 36 through the controller 9. The driving current supplied from the battery pack 19 to the short-circuit component 36 is controlled by the controller 9. The driving current flows in the short-circuit component 36. The short-circuit component 36 transmits the driving current from the battery pack 19 to the coil 35.

[0096] In the present embodiment, three short-circuit components 36 are provided. The three short-circuit components 36 are respectively assigned to any one of the U phase, the V phase, and the W phase. One of the three short-circuit components 36 is a U-phase short-circuit component assigned to the U phase, one short-circuit component 36 is a V-phase short-circuit component assigned to the V phase, and one short-circuit component 36 is a W-phase short-circuit component assigned to the W phase.

[0097] The short-circuit component 36 has a power terminal 39 and a welding terminal (not shown). The power terminal 39 is arranged at the bottom of the short-circuit component 36. Three power terminals 39 are supported by the terminal support portion 47. The three power terminals 39 are arranged in the left-right direction. The power terminal 39 is connected to the battery pack 19 through the controller 9.

[0098] The driving current from the battery pack 19 is supplied to the power terminal 39 through a power line (not shown). One power line is fixed to one power terminal 39. One of the three power lines is a U-phase power line fixed to the power terminal 39 of the U-phase short-circuit component, one power line is a V-phase power line fixed to the power terminal 39 of the V-phase short-circuit component, and one power line is a W-phase power line fixed to the power terminal 39 of the W-phase short-circuit component.

[0099] The power line and the power terminal 39 are fixed by a screw 52. The screw 52 is inserted into the threaded opening 40 provided in the power terminal 39, and then inserted into the threaded hole 46 provided in the terminal support portion 47.

[0100] The short-circuit component 36 is connected to the coil 35 via a welding terminal (not shown). The short-circuit component 36 connects the power terminal 39 and the welding terminal. The driving current from the battery pack 19 is supplied to the power terminal 39 of the short-circuit component 36 via the controller 9 and the power line. The driving current supplied from the battery pack 19 to the power terminal 39 flows through the short-circuit component 36 including the power terminal 39 and is then supplied to the coil 35.

[0101] The driving current supplied from the battery pack 19 to the motor 20 includes a U-phase driving current, a V-phase driving current, and a W-phase driving current. After the U-phase driving current is supplied to the U-phase power supply terminal through the U-phase power supply line, it is supplied to the U-phase coil through the U-phase short-circuit component. After the V-phase driving current is supplied to the V-phase power supply terminal through the V-phase power supply line, it is supplied to the V-phase coil through the V-phase short-circuit component. After the W-phase driving current is supplied to the W-phase power supply terminal through the W-phase power supply line, it is supplied to the W-phase coil through the W-phase short-circuit component.

[0102] The short-circuit member 36 has a threaded opening 50 aligned with the threaded boss portion 43. The short-circuit member 36 is fixed to the front insulator 34F by a screw 51. The screw 51 is inserted into the threaded opening 50 provided in the short-circuit member 36 and then inserted into the threaded hole of the threaded boss portion 43.

[0103] The sensor substrate 22A detects the rotation of the rotor 23. At least a portion of the sensor substrate 22A is disposed at a position facing an end surface 27F of the rotor 23 in the axial direction.

[0104] The sensor substrate 22A includes a rotation sensor 60, a plate member 70, and a signal line 80. Figure 5 In FIG. 1 , the plate member 70 is indicated by an imaginary line.

[0105] The rotation sensor 60 detects the rotation of the rotor 23. The rotation sensor 60 detects the position of the rotor 23 in the rotation direction by detecting the position of the permanent magnet 29 supported by the rotor core 27. The rotation sensor 60 is a magnetic sensor including a Hall element. Three rotation sensors 60 are provided. The three rotation sensors 60 are arranged on an imaginary circle centered on the rotation axis AX. The three rotation sensors 60 are arranged at intervals of 60 [°] centered on the rotation axis AX.

[0106] The rotation sensor 60 is disposed at a position facing the axial end surface 27F of the rotor core 27. The rotation sensor 60 is disposed radially inward of the coil 35. The rotation sensor 60 is disposed radially inward of the inner coil stopper 41.

[0107] When the upper end in the circumferential direction is at 0[°], the left end in the circumferential direction is at 90[°], the lower end in the circumferential direction is at 180[°], and the right end in the circumferential direction is at 270[°], the power terminal 39 is arranged at 180[°]. The first rotation sensor 60 is arranged at 120[°], the second rotation sensor 60 is arranged at 240[°], and the third rotation sensor 60 is arranged at 180[°].

[0108] The plate member 70 supports the rotation sensor 60. The plate member 70 is a parallel flat plate. The front surface of the plate member 70 facing the front side is substantially a flat surface. The rear surface of the plate member 70 facing the rear side is substantially a flat surface. The front surface of the plate member 70 and the rear surface of the plate member 70 are substantially parallel. The plate member 70 includes a printed wiring board (PWB: Printed Wiring Board). The plate member 70 is manufactured by cutting a rectangular printed wiring board (PWB: Printed Wiring Board).

[0109] The plate member 70 has an arc portion 71 and an arm portion 72 .

[0110] The arc portion 71 is arranged at a portion around the rotation axis AX. The arc portion 71 has a facing surface 71A facing the axial end surface 27F of the rotor 23, and a reverse surface 71B facing the opposite direction of the facing surface 71A. The rotation sensor 60 is arranged on the facing surface 71A. In the embodiment, the facing surface 71A is a portion of the rear surface of the plate member 70 facing the rear side. The reverse surface 71B is a portion of the front surface of the plate member 70 facing the front side.

[0111] The arc portion 71 is disposed at a position facing the axial end surface 27F of the rotor core 27. The arc portion 71 is disposed radially inward of the coil 35. The arc portion 71 is disposed radially inward of the inner coil stopper 41.

[0112] When the upper end in the circumferential direction is 0[°], the left end in the circumferential direction is 90[°], the lower end in the circumferential direction is 180[°], and the right end in the circumferential direction is 270[°], the arc portion 71 is arranged in a range of approximately 110[°] to 250[°]. The first rotation sensor 60 is arranged at one end in the circumferential direction of the arc portion 71, the second rotation sensor 60 is arranged at the other end in the circumferential direction of the arc portion 71, and the third rotation sensor 60 is arranged at the central part in the circumferential direction of the arc portion 71.

[0113] The arm portion 72 protrudes radially outward from the arc portion 71. At least two arm portions 72 are provided. In the present embodiment, the arm portion 72 includes a first arm portion 721, a second arm portion 722, and a third arm portion 723. The first arm portion 721 protrudes radially outward from one end portion of the arc portion 71 in the circumferential direction. The second arm portion 722 protrudes radially outward from the other end portion of the arc portion 71 in the circumferential direction. The third arm portion 723 protrudes radially outward from the central portion of the circumferential direction of the arc portion 71. In the radial direction, the size of the first arm portion 721 and the size of the second arm portion 722 are equal. In the radial direction, the size of the third arm portion 723 is larger than the size of the first arm portion 721 and the size of the second arm portion 722. In the radial direction, the distance between the rotation axis AX and the end of the third arm portion 723 on the radial outer side is longer than the distance between the rotation axis AX and the end of the first arm portion 721 (second arm portion 722) on the radial outer side.

[0114] The end of the radially outer arm portion 72 is arranged radially outward from the coil 35. The end of the radially outer first arm portion 721, the end of the radially outer second arm portion 722, and the end of the radially outer third arm portion 723 are arranged radially outward from the coil 35, respectively.

[0115] The plate member 70 is fixed to the front insulator 34F. The arm portion 72 is fixed to the front insulator 34F. In the embodiment, the end of the first arm portion 721 and the end of the second arm portion 722 on the radial outer side are fixed to the front insulator 34F. The end of the first arm portion 721 and the end of the second arm portion 722 on the radial outer side are respectively provided with a threaded opening 53. The first arm portion 721 and the second arm portion 722 are respectively fixed to the front insulator 34F by screws 51. The screw 51 is inserted into the threaded opening 53 and the threaded opening 50 provided in the short-circuit member 36, and then inserted into the threaded hole of the threaded boss portion 43.

[0116] The third arm portion 723 is arranged in front of the power terminal 39. The third arm portion 723 is arranged so as to overlap with the power terminal 39 in a plane perpendicular to the rotation axis AX.

[0117] The signal line 80 connects the rotation sensor 60 and the controller 9. The detection signal of the rotation sensor 60 is sent to the controller 9 through the signal line 80. The controller 9 controls the drive current supplied from the battery pack 19 to the coil 35 according to the detection signal of the rotation sensor 60. Five signal lines 80 are provided. The signal line 80 is supported by the third arm 723. The signal line 80 is arranged on the front surface of the third arm 723.

[0118] In the axial direction, the facing surface 71A is arranged at a position closer to the center of the coil 35 than the front end portion 35F of the coil 35. In the axial direction, the reverse surface 71B is also arranged at a position closer to the center of the coil 35 than the front end portion 35F of the coil 35. That is, the facing surface 71A and the reverse surface 71B are respectively arranged at positions on the rear side of the front end portion 35F of the coil 35. In the present embodiment, the plate member 70 is a parallel flat plate. In the axial direction, the rear surface and the front surface of the plate member 70 are respectively arranged at positions on the rear side of the front end portion 35F of the coil 35. The arc portion 71 supporting the rotation sensor 60 is arranged on the radial inner side of the coil 35 in a manner that the rotation sensor 60 does not contact the rotor core 27 and the permanent magnet 29.

[0119] The arm portion 72 is arranged between a pair of coils 35 adjacent to each other in the circumferential direction. When the position of the upper end portion in the circumferential direction is 0[°], the position of the left end portion in the circumferential direction is 90[°], the position of the lower end portion in the circumferential direction is 180[°], and the position of the right end portion in the circumferential direction is 270[°], the first coil 35 is arranged at 30[°], the second coil 35 is arranged at 90[°], the third coil 35 is arranged at 150[°], the fourth coil 35 is arranged at 210[°], the fifth coil 35 is arranged at 270[°], and the sixth coil 35 is arranged at 330[°]. The first arm portion 721 is arranged at 120[°], the third arm portion 723 is arranged at 180[°], and the second arm portion 722 is arranged at 240[°]. At least a portion of the first arm 721 is disposed between the second coil 35 and the third coil 35. At least a portion of the third arm 723 is disposed between the third coil 35 and the fourth coil 35. At least a portion of the second arm 722 is disposed between the fourth coil 35 and the fifth coil 35.

[0120] <Effect> As described above, in the present embodiment, the electric working machine 1 may include the motor 20 and the sensor substrate 22A, wherein the motor 20 includes the rotor 23 that rotates around the rotation axis AX and the stator 24 that is arranged around the rotor 23; and the sensor substrate 22A includes the rotation sensor 60 that detects the rotation of the rotor 23 and the plate member 70 that supports the rotation sensor 60. The stator 24 may include the stator core 33 that is arranged around the rotor 23, the insulator 34 that is fixed to the stator core 33, and the plurality of coils 35 that are fixed to the insulator 34 and arranged at intervals in the circumferential direction. The plate member 70 may include the arc portion 71 and at least two arm portions 72, wherein the arc portion 71 is arranged at a portion around the rotation axis AX and has the facing surface 71A that faces the axial end surface 27F of the rotor 23; and the at least two arm portions 72 that protrude radially outward from the arc portion 71 and are fixed to the insulator 34. The rotation sensor 60 may be disposed on the facing surface 71A.

[0121] In the above structure, a portion of the plate member 70 of the sensor substrate 22A is an arc portion 71, so the sensor substrate 22A is miniaturized and lightweight. A portion of the plate member 70 fixed to the insulator 34 is an arm portion 72, so the sensor substrate 22A is miniaturized and lightweight. By miniaturizing and lightweighting the sensor substrate 22A, the motor assembly 6 including the motor 20 and the sensor substrate 22A is miniaturized and lightweight. Accordingly, the electric working machine 1 is miniaturized and lightweight. In addition, a plurality of plate members 70 are manufactured from a rectangular printed wiring board (PWB: Printed Wiring Board).

[0122] In the present embodiment, the arc portion 71 may be arranged radially inward of the coil 35 .

[0123] In the above structure, the motor assembly 6 is miniaturized in the radial direction.

[0124] In the present embodiment, the radially outer end of the arm portion 72 may be arranged radially outward of the coil 35. The end of the arm portion 72 may be fixed to the insulator 34.

[0125] In the above-described structure, the sensor substrate 22A is fixed to the insulator 34 by fixing the end of the arm portion 72 to the insulator 34 .

[0126] In the present embodiment, the facing surface 71A may be arranged at a position closer to the center of the coil 35 than the front end portion 35F of the coil 35 in the axial direction.

[0127] In the above structure, at least a part of the arc portion 71 enters the radial inner side of the coil 35, so the motor assembly 6 is miniaturized in the axial direction.

[0128] In the present embodiment, the arc portion 71 may include an opposing surface 71B facing in the opposite direction of the facing surface 71A. The opposing surface 71B may be arranged at a position closer to the center of the coil 35 than the front end portion 35F of the coil 35 in the axial direction.

[0129] In the above structure, the entire arc portion 71 enters the radial inner side of the coil 35, so the motor assembly 6 is miniaturized in the axial direction.

[0130] In this embodiment, the plate member 70 may be a parallel flat plate.

[0131] In the above-described structure, the board member 70 is manufactured from a printed wiring board (PWB: Printed Wiring Board).

[0132] In the present embodiment, the arm portion 72 may be disposed between a pair of coils 35 adjacent to each other.

[0133] In the above-described structure, even if the plate member 70 is a parallel flat plate, at least a portion of the arc portion 71 enters the radially inner side of the coil 35 .

[0134] In this embodiment, the arm portion 72 may include a first arm portion 721 and a second arm portion 722. The first arm portion 721 may protrude radially outward from one circumferential end of the arc portion 71, and the second arm portion 722 may protrude radially outward from the other circumferential end of the arc portion 71.

[0135] In the above-described structure, the end portion of the arc portion 71 in the circumferential direction is prevented from bending or vibrating.

[0136] In the present embodiment, the arm portion 72 may include a third arm portion 723. The third arm portion 723 may protrude radially outward from a central portion in the circumferential direction of the arc portion 71.

[0137] In the above-described structure, the first arm portion 721 , the second arm portion 722 , and the third arm portion 723 are respectively fixed to the insulator 34 , whereby the sensor substrate 22A is firmly fixed to the insulator 34 .

[0138] In this embodiment, the electric working machine 1 may include a controller 9 and a signal line 80, wherein the controller 9 controls the driving current supplied to the coil 35 according to the detection signal of the rotation sensor 60; and the signal line 80 connects the rotation sensor 60 and the controller 9. The signal line 80 may be supported by the third arm 723.

[0139] In the above-described structure, the signal line 80 is supported by the third arm portion 723 of the plate member 70 .

[0140] In the present embodiment, the electric working machine 1 may include a power terminal 39 through which a driving current flows. The third arm portion 723 may be arranged so as to overlap with the power terminal 39 in a plane perpendicular to the rotation axis AX.

[0141] In the above-mentioned structure, the motor assembly 6 is prevented from increasing in size in the radial direction.

[0142] In the present embodiment, the first arm portion 721 and the second arm portion 722 may be fixed to the insulator 34 by screws 51 , respectively.

[0143] In the above-described structure, the sensor substrate 22A can be easily replaced with a new sensor substrate 22A by removing the screws 51 .

[0144] In addition, in the present embodiment, at least one of the first arm 721, the second arm 722, and the third arm 723 may be fixed to the insulator 34 by the screw 51. For example, the third arm 723 may be fixed to the insulator 34 by the screw 51, and the first arm 721 and the second arm 722 may not be fixed to the insulator 34. In addition, all of the first arm 721, the second arm 722, and the third arm 723 may be fixed to the insulator 34 by the screw 51.

[0145] [Second embodiment] In the following description, the same reference numerals are used to denote the same or equivalent components as those in the above-described embodiment, and the description of the components is simplified or omitted.

[0146] Fig.10 This is a diagram showing the stator 24 and the sensor substrate 22B according to the present embodiment as seen from the front. Fig.11 This is a diagram of the stator 24 according to the present embodiment as seen from the front. Fig.12 This is a diagram showing the stator 24 and the sensor substrate 22B according to the present embodiment as viewed from the left side. Fig.13 2 is a cross-sectional view showing the stator 24 and the sensor substrate 22B according to the present embodiment. Fig.11 In FIG. 1 , the plate member 70 is indicated by an imaginary line.

[0147] In the present embodiment, the plate member 70 has an arc portion 71, a first arm portion 721, a second arm portion 722, a third arm portion 723, and a cover portion 73 connecting the end of the first arm portion 721, the end of the second arm portion 722, and the end of the third arm portion 723 on the radial outside. The cover portion 73 is arranged at a position radially outside the coil 35. In the present embodiment, the plate member 70 has two openings. The opening on one side is defined by the arc portion 71, the first arm portion 721, the third arm portion 723, and the cover portion 73. The opening on the other side is defined by the arc portion 71, the second arm portion 722, the third arm portion 723, and the cover portion 73. In a plane orthogonal to the rotation axis AX, the opening on one side overlaps with at least a portion of one coil 35, and the opening on the other side overlaps with at least a portion of one coil 35.

[0148] The cover portion 73 is arranged in front of the power terminal 39. The cover portion 73 is arranged so as to overlap with the power terminal 39 in a plane perpendicular to the rotation axis AX. The signal line 80 is supported on the front surface of the cover portion 73.

[0149] In the axial direction, the facing surface 71A is arranged at a position closer to the center of the coil 35 than the front end portion 35F of the coil 35. In the axial direction, the reverse surface 71B is also arranged at a position closer to the center of the coil 35 than the front end portion 35F of the coil 35. That is, the facing surface 71A and the reverse surface 71B are respectively arranged at a position on the rear side of the front end portion 35F of the coil 35.

[0150] As described above, in this embodiment, the plate member 70 may include the cover portion 73 connecting the radially outer end of the first arm portion 721 , the radially outer end of the second arm portion 722 , and the radially outer end of the third arm portion 723 .

[0151] In the above structure, the strength of the plate member 70 is improved.

[0152] In this embodiment, the electric working machine 1 may include a controller 9 for controlling the driving current supplied to the coil 35 according to the detection signal of the rotation sensor 60, and a signal line 80 for connecting the rotation sensor 60 and the controller 9. The signal line 80 may be supported by the cover 73.

[0153] In the above structure, the signal line 80 is supported by the cover portion 73 of the plate member 70 .

[0154] In the present embodiment, the electric working machine 1 may include the power terminal 39 through which the driving current flows. The cover portion 73 may be arranged so as to overlap with the power terminal 39 in a plane orthogonal to the rotation axis AX.

[0155] In the above-described structure, the motor assembly 6 is prevented from increasing in size in the radial direction.

[0156] [Third embodiment] In the following description, the same reference numerals are used to denote the same or equivalent components as those in the above-described embodiment, and the description of the components is simplified or omitted.

[0157] Fig.14 This is a diagram showing the stator 24 and the sensor substrate 22C according to the present embodiment as seen from the front. Fig.15 This is a diagram of the stator 24 according to the present embodiment as seen from the front. Fig.16 This is a diagram showing the stator 24 and the sensor substrate 22C according to the present embodiment as viewed from the left side. Fig.17 It is a cross-sectional view showing the stator 24 and the sensor substrate 22C according to the present embodiment. Fig.18 It is an exploded perspective view showing the stator 24 and the sensor substrate 22C according to the present embodiment, as seen from the front. Fig.19 2 is a cross-sectional view showing the stator 24 and the sensor substrate 22C according to the present embodiment. Fig.15 In FIG. 1 , the plate member 70 is indicated by an imaginary line. Fig.19 Equivalent to Fig.14 AA section view.

[0158] The plate member 70 includes an arc portion 71, a first arm portion 721, a second arm portion 722, and a third arm portion 723. In the present embodiment, the motor assembly 6 includes a support member 90 fixed to the front insulator 34F.

[0159] At least two arm portions 72 are fixed to the front insulator 34F via the support member 90. In the present embodiment, the first arm portion 721 and the second arm portion 722 are fixed to the support member 90 by the screws 51 (second screws), respectively.

[0160] The support member 90 includes a support arc portion 94 and a threaded boss portion 92 .

[0161] The support arc portion 94 is disposed at a portion around the rotation axis AX. The support arc portion 94 is disposed radially outward from the coil 35. The support arc portion 94 is disposed so as to overlap with the annular portion 48 of the front insulator 34F in a plane perpendicular to the rotation axis AX.

[0162] When the position of the upper end portion in the circumferential direction is set to 0[°], the position of the left end portion in the circumferential direction is set to 90[°], the position of the lower end portion in the circumferential direction is set to 180[°], and the position of the right end portion in the circumferential direction is set to 270[°], the supporting arc portion 94 is configured in the range of approximately 110[°] to 250[°].

[0163] The support arc portion 94 is fixed to the front insulator 34F by a screw 54 (first screw). Screw openings 93 are provided at one end and the other end in the circumferential direction of the support arc portion 94. The screw 54 is inserted into the threaded hole of the threaded boss portion 43 provided in the front insulator 34F after being inserted into the threaded opening 50 provided in the short-circuit component 36.

[0164] The threaded boss portion 92 is connected to one end portion and the other end portion of the circumferential direction of the supporting arc portion 94, respectively. The threaded boss portion 92 is arranged at a position radially inner than the supporting arc portion 94. The two arm portions 72 are fixed to the threaded boss portion 92 by screws 51 (second screws). The first arm portion 721 is fixed to the threaded boss portion 92 on one side by screws 51, and the second arm portion 722 is fixed to the threaded boss portion 92 on the other side by screws 51. The screw 51 on one side is inserted into the threaded opening 53 provided in the first arm portion 721, and then inserted into the threaded hole of the threaded boss portion 92 on one side. The screw 51 on the other side is inserted into the threaded opening 53 provided in the second arm portion 722, and then inserted into the threaded hole of the threaded boss portion 92 on the other side.

[0165] A recessed portion 91 is provided in the circumferential center of the support arc portion 94 . The recessed portion 91 is recessed rearward from the front surface of the support arc portion 94 . At least a portion of the third arm portion 723 is disposed in the recessed portion 91 .

[0166] The arc portion 71 is arranged radially inwardly of the support arc portion 94. The arc portion 71 is arranged radially outwardly of the coil 35.

[0167] like Fig.19 As shown, the threaded boss portion 92 has an end face 92R facing the same direction as the facing surface 71A. The end face 92R faces the rear side. The end face 92R is the rear end face of the threaded boss portion 92. The end face 37F of the yoke portion 37 of the stator core 33 faces the direction opposite to the facing surface 71A. In the axial direction, the end face 92R of the threaded boss portion 92 is arranged at a position closer to the center of the coil 35 than the end face 37F of the yoke portion 37 of the stator core 33. That is, the end face 92R of the threaded boss portion 92 is arranged at a position closer to the rear side than the end face 37F of the yoke portion 37 of the stator core 33.

[0168] In the axial direction, the facing surface 71A is arranged at a position closer to the center of the coil 35 than the front end portion 35F of the coil 35. In the axial direction, the reverse surface 71B is also arranged at a position closer to the center of the coil 35 than the front end portion 35F of the coil 35. That is, the facing surface 71A and the reverse surface 71B are respectively arranged at a position on the rear side of the front end portion 35F of the coil 35.

[0169] As described above, in the present embodiment, the electric working machine 1 may include the support member 90 fixed to the insulator 34 . At least two arm portions 72 may be fixed to the insulator 34 via the support member 90 .

[0170] In the above structure, the plate member 70 is fixed to the insulator 34 via the support member 90. Even if the plate member 70 is a parallel flat plate, the plate member 70 and the insulator 34 are appropriately fixed via the support member 90 by adjusting the shape of the support member 90.

[0171] In this embodiment, the support member 90 may include a support arc portion 94 and a threaded boss portion 92, wherein the support arc portion 94 is fixed to the insulator 34 by a screw 54 as a first screw; the threaded boss portion 92 is arranged at a position radially inward of the support arc portion 94, and the arm portion 72 is fixed by a screw 51 as a second screw. In the axial direction, the end face 92R of the threaded boss portion 92 facing the same direction as the facing surface 71A may be arranged at a position closer to the center of the coil 35 than the end face 37F of the stator core 33 facing the direction opposite to the facing surface 71A.

[0172] In the above structure, the plate member 70 is stably fixed to the insulator 34 through the support member 90. The threaded boss portion 92 is arranged at a position radially inward of the support arc portion 94, so the length of the threaded boss portion 92 is not restricted. That is, the threaded boss portion 92 is arranged at a position radially inward of the yoke portion 37 of the stator core 33 and is arranged between a pair of adjacent teeth 38, so the length of the threaded boss portion 92 is not restricted. In the case where the plate member 70 is arranged at a position on the rear side of the front end portion 35F of the coil 35, when the plate member 70 is fixed to the insulator 34 by the screw 51, if the screw 51 is long, the top end of the screw 51 may contact the end face 37F of the stator core 33, so the screw 51 may need to be shortened. In the case where the screw 51 is short, the fixing of the plate member 70 and the insulator 34 may become unstable. In this embodiment, since the length of the screw boss portion 92 is not restricted, long screws 51 can be used even when the plate member 70 is arranged at a position rearward of the front end portion 35F of the coil 35. Therefore, the plate member 70 is stably fixed to the insulator 34 via the support member 90.

[0173] [Fourth embodiment] In the following description, the same reference numerals are used to denote the same or equivalent components as those in the above-described embodiment, and the description of the components is simplified or omitted.

[0174] Fig. 20This is a diagram showing the stator 24 and the sensor substrate 22D according to the present embodiment as seen from the front. Fig.21 This is a diagram of the stator 24 according to the present embodiment as seen from the front. Fig. 22 This is a diagram showing the stator 24 and the sensor substrate 22D according to the present embodiment as viewed from the left side. Fig.23 2 is a cross-sectional view showing the stator 24 and the sensor substrate 22D according to the present embodiment. Fig.21 In FIG. 1 , the plate member 70 is indicated by an imaginary line.

[0175] In the present embodiment, the plate member 70 includes an arc portion 71, a first arm portion 721, a second arm portion 722, and a bridge portion 74 connecting the radially outer end of the first arm portion 721 and the end of the second arm portion 722. The bridge portion 74 is arranged at a position radially outward of the coil 35. In the present embodiment, the plate member 70 does not include the third arm portion 723.

[0176] The bridge portion 74 is disposed at a portion around the rotation axis AX and has an arc shape. The bridge portion 74 is disposed radially outward from the coil 35. The bridge portion 74 is disposed so as to overlap the annular portion 48 of the front insulator 34F in a plane perpendicular to the rotation axis AX.

[0177] When the position of the upper end in the circumferential direction is set to 0[°], the position of the left end in the circumferential direction is set to 90[°], the position of the lower end in the circumferential direction is set to 180[°], and the position of the right end in the circumferential direction is set to 270[°], the bridge portion 74 is configured in a range of approximately 110[°] to 250[°].

[0178] In the present embodiment, the plate member 70 has one opening. The opening is defined by the arc portion 71, the first arm portion 721, the second arm portion 722, and the bridge portion 74. The opening and the two coils 35 overlap in a plane perpendicular to the rotation axis AX.

[0179] The bridge portion 74 is arranged radially inward of the power terminal 39 . The signal line 80 is supported by the front surface of the bridge portion 74 .

[0180] In the axial direction, the facing surface 71A is arranged at a position closer to the center of the coil 35 than the front end portion 35F of the coil 35. In the axial direction, the reverse surface 71B is also arranged at a position closer to the center of the coil 35 than the front end portion 35F of the coil 35. That is, the facing surface 71A and the reverse surface 71B are respectively arranged at a position on the rear side of the front end portion 35F of the coil 35.

[0181] As described above, in the present embodiment, the plate member 70 may include the bridge portion 74 connecting the end portion of the first arm portion 721 and the end portion of the second arm portion 722 on the radially outer side.

[0182] In the above structure, the strength of the plate member 70 is improved.

[0183] In the present embodiment, the bridge portion 74 may be disposed at a portion around the rotation axis AX and may have an arc shape.

[0184] In the above-mentioned structure, the motor assembly 6 is prevented from increasing in size in the radial direction.

[0185] In this embodiment, the electric working machine 1 may include a controller 9 for controlling the driving current supplied to the coil 35 according to the detection signal of the rotation sensor 60 and a signal line 80 for connecting the rotation sensor 60 and the controller 9. The signal line 80 may be supported by the bridge portion 74.

[0186] In the above structure, the signal line 80 is supported by the bridge portion 74 of the plate member 70 .

[0187] [Fifth embodiment] In the following description, the same reference numerals are used to denote the same or equivalent components as those in the above-described embodiment, and the description of the components is simplified or omitted.

[0188] Fig.24 This is a diagram showing the stator 24 and the sensor substrate 22A according to the present embodiment as seen from the front. Fig.25 This is a diagram showing the stator 24 and the sensor substrate 22A according to the present embodiment as viewed from the left side. Fig.26 It is a cross-sectional view showing the stator 24 and the sensor substrate 22A according to the present embodiment.

[0189] This embodiment is a modified example of the above-mentioned first embodiment. In the above-mentioned first embodiment, the facing surface 71A and the reverse surface 71B of the sensor substrate 22A are respectively arranged at positions closer to the center of the coil 35 than the front end portion 35F of the coil 35. That is, the facing surface 71A and the reverse surface 71B are respectively arranged at positions on the rear side than the front end portion 35F of the coil 35.

[0190] In this embodiment, the facing surface 71A and the reverse surface 71B of the sensor substrate 22A are respectively arranged farther from the center of the coil 35 than the front end 35F of the coil 35. That is, the facing surface 71A and the reverse surface 71B are respectively arranged forward of the front end 35F of the coil 35.

[0191] As described above, the facing surface 71A and the reverse surface 71B of the sensor substrate 22A may be arranged on the front side of the front end portion 35F of the coil 35 .

[0192] [Sixth embodiment] In the following description, the same reference numerals are used to denote the same or equivalent components as those in the above-described embodiment, and the description of the components is simplified or omitted.

[0193] Fig. 27 This is a diagram showing the stator 24 and the sensor substrate 22B according to the present embodiment as seen from the front. Fig.28 This is a diagram showing the stator 24 and the sensor substrate 22B according to the present embodiment as viewed from the left side. Fig.29 It is a cross-sectional view showing the stator 24 and the sensor substrate 22B according to the present embodiment.

[0194] This embodiment is a modified example of the above-mentioned second embodiment. In the above-mentioned second embodiment, the facing surface 71A and the reverse surface 71B of the sensor substrate 22B are respectively arranged at positions closer to the center of the coil 35 than the front end portion 35F of the coil 35. That is, the facing surface 71A and the reverse surface 71B are respectively arranged at positions on the rear side than the front end portion 35F of the coil 35.

[0195] In this embodiment, the facing surface 71A and the reverse surface 71B of the sensor substrate 22B are respectively arranged farther from the center of the coil 35 than the front end 35F of the coil 35. That is, the facing surface 71A and the reverse surface 71B are respectively arranged forward of the front end 35F of the coil 35.

[0196] As described above, the facing surface 71A and the reverse surface 71B of the sensor substrate 22B may be arranged on the front side of the front end portion 35F of the coil 35 .

[0197] [Seventh embodiment] In the following description, the same reference numerals are used to denote the same or equivalent components as those in the above-described embodiment, and the description of the components is simplified or omitted.

[0198] Fig.30 This is a diagram showing the stator 24 and the sensor substrate 22C according to the present embodiment as seen from the front. Fig.31 This is a diagram showing the stator 24 and the sensor substrate 22C according to the present embodiment as viewed from the left side. Fig.33 It is a cross-sectional view showing the stator 24 and the sensor substrate 22C according to the present embodiment.

[0199] This embodiment is a modified example of the above-mentioned embodiment 3. In the above-mentioned embodiment 3, the facing surface 71A and the reverse surface 71B of the sensor substrate 22C are respectively arranged at positions closer to the center of the coil 35 than the front end portion 35F of the coil 35. That is, the facing surface 71A and the reverse surface 71B are respectively arranged at positions on the rear side than the front end portion 35F of the coil 35.

[0200] In this embodiment, the facing surface 71A and the reverse surface 71B of the sensor substrate 22C are respectively arranged farther from the center of the coil 35 than the front end 35F of the coil 35. That is, the facing surface 71A and the reverse surface 71B are respectively arranged forward of the front end 35F of the coil 35.

[0201] As described above, the facing surface 71A and the reverse surface 71B of the sensor substrate 22C may be arranged on the front side of the front end portion 35F of the coil 35 .

[0202] [Eighth embodiment] In the following description, the same reference numerals are used to denote the same or equivalent components as those in the above-described embodiment, and the description of the components is simplified or omitted.

[0203] Fig.33 This is a diagram showing the stator 24 and the sensor substrate 22D according to the present embodiment as seen from the front. Fig.34 This is a diagram showing the stator 24 and the sensor substrate 22D according to the present embodiment as viewed from the left side. Fig.35 It is a cross-sectional view showing the stator 24 and the sensor substrate 22D according to the present embodiment.

[0204] This embodiment is a modified example of the above-mentioned embodiment 4. In the above-mentioned embodiment 4, the facing surface 71A and the reverse surface 71B of the sensor substrate 22D are respectively arranged at positions closer to the center of the coil 35 than the front end portion 35F of the coil 35. That is, the facing surface 71A and the reverse surface 71B are respectively arranged at positions on the rear side than the front end portion 35F of the coil 35.

[0205] In this embodiment, the facing surface 71A and the reverse surface 71B of the sensor substrate 22D are respectively arranged farther from the center of the coil 35 than the front end 35F of the coil 35. That is, the facing surface 71A and the reverse surface 71B are respectively arranged forward of the front end 35F of the coil 35.

[0206] As described above, the facing surface 71A and the reverse surface 71B of the sensor substrate 22D may be arranged on the front side of the front end portion 35F of the coil 35 .

[0207] [Ninth embodiment] In the following description, the same reference numerals are used to denote the same or equivalent components as those in the above-described embodiment, and the description of the components is simplified or omitted.

[0208] Fig.36 This is a diagram showing the stator 24 and the sensor substrate 22E according to this embodiment as viewed from the front. Fig.36 As shown, the plate member 70 of the sensor substrate 22E has an arc portion 71, an arm portion 72, and an outer arc portion 75. In this embodiment, the plate member 70 has a third arm portion 723, and does not have a first arm portion 721 and a second arm portion 722. The outer arc portion 75 is connected to the end of the third arm portion 723 on the radial outer side.

[0209] The outer arc portion 75 is arranged at a portion around the rotation axis AX and is in an arc shape. The outer arc portion 75 is arranged at a position radially outward from the coil 35. In a plane orthogonal to the rotation axis AX, the outer arc portion 75 is arranged so as to overlap with the annular portion 48 of the front insulator 34F. One end and the other end of the outer arc portion 75 in the circumferential direction are fixed to the front insulator 34F by screws 51, respectively.

[0210] When the position of the upper end portion in the circumferential direction is set to 0[°], the position of the left end portion in the circumferential direction is set to 90[°], the position of the lower end portion in the circumferential direction is set to 180[°], and the position of the right end portion in the circumferential direction is set to 270[°], the outer arc portion 75 is configured in the range of approximately 110[°] to 250[°].

[0211] The outer arc portion 75 is arranged radially inward of the power terminal 39 . The signal line 80 is supported by the front surface of the outer arc portion 75 .

[0212] In the axial direction, the facing surface 71A is arranged at a position closer to the center of the coil 35 than the front end portion 35F of the coil 35. In the axial direction, the reverse surface 71B is also arranged at a position closer to the center of the coil 35 than the front end portion 35F of the coil 35. That is, the facing surface 71A and the reverse surface 71B are respectively arranged at a position closer to the rear side than the front end portion 35F of the coil 35. In addition, the facing surface 71A and the reverse surface 71B can also be respectively arranged at a position closer to the front side than the front end portion 35F of the coil 35.

[0213] As described above, the arm portion 72 may be a single piece.

[0214] [10th embodiment] In the following description, the same reference numerals are used to denote the same or equivalent components as those in the above-described embodiment, and the description of the components is simplified or omitted.

[0215] Fig.37 This is a diagram for explaining the relationship between the facing surface 71A and the reverse surface 71B according to the present embodiment, and the front end portion 35F of the coil 35 .

[0216] In each of the first to ninth embodiments described above, Fig.37 As shown in state A, in the axial direction, both the facing surface 71A and the reverse surface 71B can be arranged at a position farther from the center of the coil 35 than the front end portion 35F of the coil 35. That is, both the facing surface 71A and the reverse surface 71B can be arranged at a position closer to the front side than the front end portion 35F of the coil 35.

[0217] In each of the first to ninth embodiments described above, Fig.37 As shown in state B, in the axial direction, the position of the facing surface 71A coincides with the position of the front end portion 35F of the coil 35, and the reverse surface 71B is arranged at a position further forward than the front end portion 35F of the coil 35.

[0218] In each of the above-mentioned first to ninth embodiments, as Fig.37 As shown in state C, the facing surface 71A is arranged at a position closer to the rear side than the front end portion 35F of the coil 35 in the axial direction, and the reverse surface 71B is arranged at a position closer to the front side than the front end portion 35F of the coil 35. In state C, the front end portion 35F of the coil 35 is arranged at a position closer to the rear side than the center of the plate member 70 in the axial direction.

[0219] In each of the above-mentioned first to ninth embodiments, as Fig.37 As shown in state D, the facing surface 71A is arranged at a position on the rear side of the front end portion 35F of the coil 35 in the axial direction, and the reverse surface 71B is arranged at a position on the front side of the front end portion 35F of the coil 35. In state D, the front end portion 35F of the coil 35 is arranged at a position on the front side of the center of the plate member 70 in the axial direction.

[0220] In each of the above-mentioned first to ninth embodiments, as Fig.37 As shown in state E, in the axial direction, the facing surface 71A is arranged at a position further rearward than the front end portion 35F of the coil 35 , and the position of the reverse surface 71B coincides with the position of the front end portion 35F of the coil 35 .

[0221] In each of the above-mentioned first to ninth embodiments, as Fig.37As shown in the state F, in the axial direction, both the facing surface 71A and the reverse surface 71B are arranged at a position closer to the center of the coil 35 than the front end portion 35F of the coil 35. That is, both the facing surface 71A and the reverse surface 71B are arranged at a position on the rear side than the front end portion 35F of the coil 35.

[0222] [Other embodiments] In addition, in the above-mentioned embodiment, the electric working machine 1 is a vibration driver drill as a kind of electric tool. The electric tool is not limited to the vibration driver drill. As the electric tool, a driver drill, an angle drill, an impact drill, a grinder, an electric hammer, a hammer drill, a circular saw and a reciprocating saw are exemplified. In addition, the electric working machine 1 may also be a gardening tool (Outdoor Power Equipment). As the gardening tool, a chain saw, a hedge trimmer, a lawn mower, a weeder and a blower are exemplified.

[0223] In the above-described embodiment, the battery pack 19 mounted on the battery mounting portion 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.

[0224] [11th embodiment] In the following description, the same reference numerals are used to denote the same or equivalent components as those in the above-described embodiment, and the description of the components is simplified or omitted.

[0225] Fig.38 This is a diagram showing a stator and a sensor substrate according to the eleventh embodiment as seen from the front. Fig.39 It is an exploded perspective view showing a stator and a sensor substrate according to the eleventh embodiment, as seen from the front. Fig.40 It is a cross-sectional view showing a stator and a sensor substrate according to the eleventh embodiment. Fig.41 It is a perspective view showing a portion of the sensor substrate according to the eleventh embodiment that is covered by a covering portion.

[0226] (Arm fixation) In the case where the first arm portion 721, the second arm portion 722, and the third arm portion 723 are all free ends that are not fixed, the arm portions that are free ends are prone to vibration due to vibration when the electric working machine 1 is used. Therefore, in the eleventh embodiment, the radially outer ends of the arm portions 72 of the plate member 70 are fixed. Specifically, the plate member 70 has three arm portions 72, namely, the first arm portion 721, the second arm portion 722, and the third arm portion 723. The first arm portion 721, the second arm portion 722, and the third arm portion 723 are fixed to the front insulator 34F, respectively. The first arm portion 721, the second arm portion 722, and the third arm portion 723 are fixed to the front insulator 34F by screws 51.

[0227] The ends of the first arm portion 721 and the second arm portion 722 on the radially outer sides are provided with threaded openings 53. The screw 51 is inserted into the threaded opening 53 and the threaded opening 50 provided in the short-circuit member 36 and then inserted into the threaded hole of the threaded boss portion 43 of the front insulator 34F.

[0228] A threaded opening 153 is provided at the radially outer end of the third arm portion 723. After being inserted into the threaded opening 153, the screw 51 is inserted into the threaded hole of the threaded boss portion 143 of the front insulator 34F. The threaded boss portion 143 is cylindrical in shape, and a threaded hole is formed on the top surface. In one short-circuit component 36, a notch portion 136 for circumventing the threaded boss portion 143 is formed instead of the threaded opening 50 for the threaded boss portion 143. The threaded boss portion 143 passes through the inner side of the notch portion 136 and extends to the front side of the short-circuit component 36. The third arm portion 723 is fixed directly to the threaded boss portion 143 of the front insulator 34F without passing through the short-circuit component 36.

[0229] In addition, the screw 51 can be a common screw of the type combined with a threaded hole pre-formed with a thread groove (internal thread), or a tapping screw. The tapping screw is a type of screw that forms a thread groove (internal thread) on the screw itself by being screwed into a bottom hole without an internal thread.

[0230] (Positioning section) In order to ensure the detection accuracy when the rotation sensor 60 detects the position of the rotor 23, it is important to reduce the position deviation caused by the assembly error of the rotation sensor 60. Therefore, in the eleventh embodiment, the stator 24 and the sensor substrate 22F have a positioning structure for positioning the sensor substrate 22F relative to the stator 24. Specifically, the sensor substrate 22F is formed with a positioning hole 111, and the front insulator 34F is provided with a positioning pin 112.

[0231] The sensor substrate 22F has a plurality of positioning holes 111. Each positioning hole 111 is arranged at each end of the sensor substrate 22F. One positioning hole 111 is provided at each radially outer end of the first arm portion 721 and the radially outer end of the second arm portion 722. The positioning hole 111 is arranged near the threaded opening 53. The positioning hole 111 has a circular shape and penetrates the plate member 70 in the thickness direction.

[0232] The front insulator 34F has the same number of positioning pins 112 (i.e., 2) as the positioning holes 111 of the sensor substrate 22F. The positioning pins 112 may be integral with the front insulator 34F or may be separate from the front insulator 34F. The two positioning pins 112 are arranged at positions overlapping with the positioning holes 111 of the sensor substrate 22F, respectively, in a plane orthogonal to the rotation axis AX. The positioning pins 112 protrude forward from the front surface of the front insulator 34F that faces the sensor substrate 22F. The positioning pins 112 have a cylindrical shape. When the sensor substrate 22F is fixed to the front insulator 34F, the positioning pins 112 are arranged inside the corresponding positioning holes 111. Accordingly, the position of the sensor substrate 22F relative to the stator 24 is determined by the front insulator 34F, thereby suppressing the position deviation of the rotation sensor 60 caused by assembly errors.

[0233] (Anti-reverse installation structure) When the sensor substrate 22F is assembled to the stator 24, the operator may assemble the sensor substrate 22F in a state where the sensor substrate 22F is reversed by mistake. In the 11th embodiment, the stator 24 and the sensor substrate 22F have a structure that prevents the sensor substrate 22F from being assembled in a state where the sensor substrate 22F is reversed. Specifically, the sensor substrate 22F has an asymmetric structure with respect to the center line LC. In addition, the center line LC is a line passing through the center in the left-right direction in the plane of the sensor substrate 22F.

[0234] The sensor substrate 22F is fixed to each end of the first arm 721, the second arm 722, and the third arm 723. The first arm 721 and the second arm 722 are symmetrical with respect to the center line LC. The threaded opening 53 and the positioning hole 111 of the first arm 721 and the threaded opening 53 and the positioning hole 111 of the second arm 722 are symmetrical with respect to the center line LC.

[0235] On the other hand, the third arm portion 723 is asymmetrical with respect to the center line LC. The end of the third arm portion 723 has a central portion 171 along the center line LC, a convex portion 172 protruding from the central portion 171 to one side (left side), and another convex portion 173 protruding from the central portion 171 to the other side (right side). The one convex portion 172 and the other convex portion 173 are formed at the same position along the direction (up and down direction) of the center line LC. The one convex portion 172 and the other convex portion 173 protrude from the central portion 171 in opposite directions to each other. The third arm portion 723 has an asymmetrical shape with respect to the center line LC at the one convex portion 172 and the other convex portion 173.

[0236] Specifically, the distance D1 from the center line LC to the top of one convex portion 172 is different from the distance D2 from the center line LC to the top of the other convex portion 173. The distance D1 is larger than the distance D2. The one convex portion 172 is larger than the other convex portion 173. The threaded opening 153 is formed in the one convex portion 172. The threaded opening 153 is formed at a position on the left or right side of the center (center line LC) at the end of the third arm portion 723.

[0237] The front insulator 34F has a guide rib 134 for preventing the sensor substrate 22F from being assembled in a state where the sensor substrate 22F is turned upside down. The guide rib 134 protrudes in the front direction from the front surface of the front insulator 34F. The guide rib 134 is arranged on the other side with respect to the center line LC. The guide rib 134 is arranged at a position adjacent to the top end of the other convex portion 173. The guide rib 134 faces the other convex portion 173 in the left-right direction. The guide rib 134 is arranged at a position where the distance from the center line LC is smaller than the distance D1 and larger than the distance D2. Accordingly, the guide rib 134 is arranged at a position in contact with the one convex portion 172 in a state where the sensor substrate 22F is turned upside down.

[0238] exist Fig.38 In the embodiment, when the sensor substrate 22F is turned upside down, the one convex portion 172 of the third arm portion 723 is arranged on the other side (right side) relative to the center line LC, and the other convex portion 173 is arranged on one side (left side) relative to the center line LC. In this case, the one convex portion 172 is arranged so as to straddle the guide rib 134, and the sensor substrate 22F becomes inclined, so the sensor substrate 22F cannot be arranged in a normal posture. In addition, the position of the threaded opening 153 of the one convex portion 172 is inconsistent with the position of the threaded boss portion 143. Therefore, the operator who performs assembly can recognize that the sensor substrate 22F is not correctly arranged.

[0239] (covering part) In the eleventh embodiment, the sensor substrate 22F has a cover 175 that covers the end of the rotation sensor 60 and the signal line 80 (the connection portion connected to the sensor substrate 22F). The cover 175 is formed on the plate member 70 by molding and is made of resin. The cover 175 wraps and seals the end of the rotation sensor 60 and the signal line 80. Fig.41 In FIG. 1 , for convenience of explanation, the outer shape of the covering portion 175 is indicated by a two-dot chain line, and each component covered by the covering portion 175 is indicated by a solid line.

[0240] The rotation sensor 60 is arranged on the facing surface 71A facing the end surface 27F of the rotor 23 in the arc portion 71 of the plate member 70. The end of the signal line 80 is arranged between the plate member 70 and the stator core 33. The end of the signal line 80 is arranged on the same surface (facing surface 71A) as the rotation sensor 60 in the plate member 70. That is, the end of the signal line 80 is arranged on the plane facing the stator core 33 side at the end of the third arm portion 723. The end of the signal line 80 is connected to the circuit part of the sensor substrate 22F at the central portion 171 of the third arm portion 723.

[0241] The cover 175 covers the circuit forming portion of the plate member 70. The cover 175 covers the arc portion 71 on which the rotation sensor 60 is arranged. The cover 175 covers both the facing surface 71A and the reverse surface 71B of the arc portion 71. Fig.40 As shown, the facing surface 71A and the reverse surface 71B are respectively arranged on the rear side closer to the center of the coil 35 than the front end portion 35F of the coil 35. The covering portion 175 covers the central portion 171 of the third arm portion 723 in the plate member 70.

[0242] The cover 175 is not formed at the contact portion of the plate member 70 that contacts the front insulator 34F and the short-circuit member 36. The cover 175 does not cover the end of the first arm 721 and the end of the second arm 722 of the plate member 70, but exposes the end of the first arm 721 and the end of the second arm 722 of the plate member 70. The cover 175 does not cover the one convex portion 172 and the other convex portion 173 of the third arm 723, but exposes the one convex portion 172 and the other convex portion 173 of the third arm 723. Since the cover 175 does not exist at the contact portion, when the sensor substrate 22F is fixed, the position of the sensor substrate 22F is prevented from being displaced due to the dimensional error of the cover 175.

[0243] As described above, in the present embodiment, the radially outer end portions of the arm portions 72 of the plate member 70 are fixed.

[0244] In the above structure, since the arm portion 72 does not become a free end, the vibration of the sensor substrate 22F is suppressed.

[0245] In the present embodiment, the threaded opening 153 of the third arm portion 723 is provided in one convex portion 172 , but the threaded opening 153 may be provided in another convex portion 173 or in the central portion 171 .

[0246] In the present embodiment, the stator 24 and the sensor substrate 22F have a positioning structure of the sensor substrate 22F relative to the stator 24 .

[0247] In the above-described structure, positional deviation of the rotation sensor 60 due to assembly error of the sensor substrate 22F can be reduced, and thus the detection accuracy of the rotation sensor 60 can be ensured.

[0248] Alternatively, the sensor substrate 22F may be provided with the positioning pin 112, and the front insulator 34F may be provided with the positioning hole 111. In other words, the positioning hole 111 may be provided on one of the sensor substrate 22F and the insulator 34, and the positioning pin 112 engaged with the positioning hole 111 may be provided on the other of the sensor substrate 22F and the insulator 34.

[0249] In the present embodiment, the stator 24 and the sensor substrate 22F have a structure that prevents the sensor substrate 22F from being assembled in a state where the sensor substrate 22F is turned upside down.

[0250] In the above structure, when assembling the sensor substrate 22F, it is possible to prevent the sensor substrate 22F from being mistakenly assembled in a reversed state. The operator does not need to pay attention to the front and back of the sensor substrate 22F, so the assembly workability is improved.

[0251] The structure for preventing the sensor substrate 22F from being assembled in a state where it is turned upside down is not limited to the above-mentioned structure. For example, the shape and position of the positioning pin 112 arranged inside the positioning hole 111 of the first arm 721 and the positioning pin 112 arranged inside the positioning hole 111 of the second arm 722 may be different. As an example of making the shape different, there are, for example, making the diameter of the positioning pin 112 different, making the outer shape different, etc. According to the difference in shape, the positioning pin 112 of one arm 72 can be prevented from being inserted into the positioning hole 111 of the other arm 72. In addition, by making the position of the positioning pin 112 asymmetric with respect to the center line LC, when the sensor substrate 22F is turned upside down, the position of the positioning hole 111 and the position of the positioning pin 112 are no longer consistent.

Claims

1. An electric working machine, characterized in that: A motor and sensor substrate, wherein The motor has a rotor that rotates around a rotation axis and a stator that is arranged around the rotor; The sensor substrate includes a rotation sensor for detecting rotation of the rotor and a plate member for supporting the rotation sensor. The stator comprises a stator core, an insulator and a plurality of coils, wherein: The stator core is arranged around the rotor; The insulator is fixed to the stator core; The plurality of coils are fixed to the insulator and arranged at intervals in the circumferential direction. The plate member has an arc portion and at least two arm portions, wherein: The arc portion is arranged at a portion around the rotation axis and has a facing surface facing an axial end surface of the rotor; At least two of the arm portions protrude radially outward from the arc portion and are fixed to the insulator. The rotation sensor is arranged on the facing surface.

2. The electric working machine according to claim 1, characterized in that: The arc portion is arranged radially inward of the coil.

3. The electric working machine according to claim 2, characterized in that: The end of the arm portion on the radially outer side is arranged radially outward from the coil. An end portion of the arm portion is fixed to the insulator.

4. The electric working machine according to claim 2, characterized in that: In the axial direction, the facing surface is arranged at a position closer to the center of the coil than one end portion of the coil.

5. The electric working machine according to claim 4, characterized in that: The arc portion has a reverse surface facing in the opposite direction of the facing surface. In the axial direction, the reverse surface is arranged at a position closer to the center of the coil than one end portion of the coil.

6. The electric working machine according to claim 4 or 5, characterized in that: The plate member is a parallel flat plate.

7. The electric working machine according to claim 6, characterized in that: The arm portion is disposed between a pair of coils adjacent to each other.

8. The electric working machine according to claim 7, characterized in that: The arm portion includes a first arm portion and a second arm portion, The first arm portion protrudes radially outward from one circumferential end of the arc portion. The second arm portion protrudes radially outward from the other end portion in the circumferential direction of the arc portion.

9. The electric working machine according to claim 8, characterized in that: The plate member includes a bridge portion connecting an end portion of the first arm portion and an end portion of the second arm portion on the radially outer side.

10. The electric working machine according to claim 9, characterized in that: The bridge portion is disposed at a portion around the rotation axis and has an arc shape.

11. The electric working machine according to claim 9, characterized in that: A controller and a signal line, wherein The controller controls the driving current supplied to the coil according to the detection signal of the rotation sensor; The signal line connects the rotation sensor and the controller, The signal line is supported by the bridge portion.

12. The electric working machine according to claim 8, characterized in that: The arm portion includes a third arm portion, The third arm portion protrudes radially outward from a central portion in the circumferential direction of the arc portion.

13. The electric working machine according to claim 12, characterized in that: A controller and a signal line, wherein The controller controls the driving current supplied to the coil according to the detection signal of the rotation sensor; The signal line connects the rotation sensor and the controller, The signal line is supported by the third arm portion.

14. The electric working machine according to claim 13, characterized in that: having a power supply terminal through which the driving current flows, The third arm portion is arranged to overlap the power terminal in a plane perpendicular to the rotation axis.

15. The electric working machine according to claim 12, characterized in that: At least one of the first arm portion, the second arm portion, and the third arm portion is fixed to the insulator by a screw.

16. The electric working machine according to claim 12, characterized in that: The plate member includes a cover portion that connects a radially outer end portion of the first arm portion, an end portion of the second arm portion, and an end portion of the third arm portion.

17. The electric working machine according to claim 16, characterized in that: A controller and a signal line, wherein The controller controls the driving current supplied to the coil according to the detection signal of the rotation sensor; The signal line connects the rotation sensor and the controller, The signal line is supported by the cover portion.

18. The electric working machine according to claim 17, characterized in that: having a power supply terminal through which the driving current flows, The cover portion is arranged to overlap the power terminal in a plane perpendicular to the rotation axis.

19. The electric working machine according to claim 1, characterized in that: A supporting member is provided, wherein the supporting member is fixed to the insulator, At least two of the arm portions are fixed to the insulator via the support member.

20. The electric working machine according to claim 19, characterized in that: The support component comprises a support arc portion and a threaded boss portion, wherein: The supporting arc portion is fixed to the insulator by a first screw; The threaded boss portion is arranged at a position radially inward of the supporting arc portion, and the arm portion is fixed by a second screw. In the axial direction, the end surface of the threaded boss portion facing in the same direction as the facing surface is arranged closer to the center of the coil than the end surface of the stator core facing in the opposite direction to the facing surface.

Images