Motor for electric working machine

Abstract

The invention provides a motor for an electric working machine. A motor (20) for an electric working machine is provided with a cylindrical stator (22). The motor has a rotor (28) disposed on the inner peripheral side of the stator. The motor has a sensor substrate (30) provided at an axial end portion of the stator. The sensor substrate is provided with a substrate main body (31) which is positioned on the radial inner side of the stator when viewed from the axial direction. The sensor substrate has a leg portion (32) protruding radially outward from the substrate main body toward the stator. The stator is exposed in at least one of the circumferential directions of the leg parts. The motor is provided with a sensor (35) which is arranged on the leg part, is opposite to the rotor and is used for detecting rotation of the rotor. Therefore, the flow of the cooling air flowing in the motor can be increased.

Description

Technical Field

[0001] The present invention relates to a motor for an electric working machine provided in an electric working machine such as a chain saw. Background Art

[0002] For example, an electric working machine called a chain saw has a motor as a driving source as described in Patent Document 1. The motor uses a so-called DC brushless motor. The brushless motor has a cylindrical stator and a rotor located radially inward of the stator and rotating integrally with the motor shaft. The brushless motor has a plurality of teeth protruding radially inward from the inner circumference of the stator. A coil is wound on each tooth. The brushless motor has a sensor substrate equipped with a Hall IC as a sensor. The sensor substrate is in the shape of a roughly circular plate extending in a direction orthogonal to the motor axis direction at the opening of the cylindrical stator. The sensor substrate is arranged in an array with the rotor in the motor axis direction. The Hall IC detects the rotation of the rotor.

[0003] A fan for generating cooling air is mounted on the motor shaft. The cooling air generated by the rotation of the fan flows over the sensor substrate into the stator to cool the coils wound around the teeth. The negative pressure generated by the cooling air flowing in the stator can also be used to cool, for example, a controller that controls the drive of the motor.

[0004] In the motor for an electric working machine in the prior art, the sensor substrate is configured in the shape of a circular plate that roughly covers the opening of the cylindrical stator. In recent years, as the power of the product has increased, the output of the motor has been set larger. Therefore, when the sensor substrate of the prior art is installed on the stator, the wind tunnel resistance of the motor becomes larger. Therefore, the motor may not be sufficiently cooled by the cooling air, resulting in an increase in the temperature of the motor. In addition, since the negative pressure of the cooling air for cooling the motor becomes smaller, the cooling air for cooling the controller, etc. becomes weaker, and the temperature of the controller, etc. may become higher. In this way, the motor or the controller, etc. may be damaged. Prior art literature Patent Literature

[0005] Patent Document 1: Japanese Patent Publication No. 7025851 Summary of the invention [Technical problem to be solved by the invention]

[0006] Therefore, there is a need for an electric working machine motor that can increase the flow rate of cooling air flowing through the motor. [Technical solutions for solving technical problems]

[0007] According to one feature of the present disclosure, a motor for an electric working machine has a cylindrical stator. The motor for an electric working machine has a rotor arranged on the inner circumferential side of the stator. The motor for an electric working machine has a sensor substrate arranged at an axial end of the stator. The sensor substrate has a substrate body located radially inside the stator when viewed from the axial direction. The sensor substrate has a leg protruding radially outward from the substrate body toward the stator. The stator is exposed on at least one side of the circumferential direction of the leg. The motor for an electric working machine has a sensor, which is arranged on the leg and opposite to the rotor, and is used to detect the rotation of the rotor.

[0008] Therefore, cooling air enters the stator from a portion where the stator is exposed on at least one side in the circumferential direction of the leg. Therefore, the wind tunnel resistance of the motor can be suppressed. In addition, the sensor is provided on the leg that protrudes radially outward from the substrate body of the sensor substrate. In addition, the stator is exposed on at least one side in the circumferential direction of the leg. Therefore, the sensor can be arranged in a position where the rotation of the rotor can be well detected, while exposing the stator in a larger area along the inner circumferential wall of the stator. Accordingly, the cooling air can flow along the inner circumferential wall of the stator, and the flow rate of the cooling air flowing in the motor can be increased. Accordingly, even when the output of the motor is set to a high output, damage to the motor and the like can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a perspective view of the electric working machine according to the first embodiment of the present disclosure. Figure 2 yes Figure 1 Cross-sectional view along line II-II. Figure 3 This is a three-dimensional diagram of the motor. Figure 4 This is a left side view of the motor viewed from the first direction side on which the sensor substrate is mounted. Figure 5 This is a right side view of the stator on which the sensor substrate is mounted, viewed from the second direction side opposite to the first direction. Figure 6 This is a perspective view of the sensor unit as viewed from the first direction side. Figure 7 This is a perspective view of the sensor unit with the frame (mould) removed, as seen from the first direction side. Figure 8 This is a perspective view of the sensor unit from which the frame is removed, as viewed from the second direction side. Fig. 9 This is a left side view of the stator on which the sensor substrate according to the second embodiment of the present disclosure is mounted, as seen from the first direction side. Fig.10 This is a right side view of the stator on which the sensor substrate is mounted, viewed from the second direction side. Fig.11 yes Fig. 9 Cross-sectional view along the line XI-XI. Fig.12 This is a perspective view of the sensor unit as viewed from the first direction side. Fig.13 This is a perspective view of the sensor unit as viewed from the second direction side. Fig.14 This is a left side view of a stator on which a sensor substrate of a conventional example is mounted, viewed from the first direction side. [Explanation of Reference Numerals] 1: electric working machine; 2: guide bar; 3: saw chain; 4: front handle; 5: hand guard; 6: rear handle; 7: trigger lock operating handle; 8: trigger; 10: working machine body; 11: main body shell; 11a: air inlet; 11b: exhaust port; 12: battery installation part; 13 battery; 14: controller; 15: cooling fan; 20: (electric working machine) motor; 21: motor housing; 22: stator; 22a: first end; 22b: 2nd end; 22c: inner periphery; 22d: stator core; 23: outer cylinder; 24: tooth; 24a: inner periphery; 25: coil; 26: insulator; 26a: inner periphery; 26b: connection portion; 26c: substrate connection portion; 27: motor shaft; 27a, 27b: bearings; 28: rotor; 28a: outer periphery; 28b: rotor core; 28c: magnet; 29: sprocket; 3 0: sensor substrate; 30a: outer side surface; 30b: inner side surface; 31: substrate body; 31a: outer periphery; 31b: inner periphery; 32: leg; 33: mounting leg; 34: frame; 35: sensor; 36: diode; 37: signal line; 38: slit; 39: pattern; 39a: inner pattern; 39b: outer pattern; 40: (electric working machine) motor; 41: sensor substrate; 41a: outer side surface; 41b: inner side surface; 42: substrate body; 42a: outer periphery; 42b: inner periphery; 43: leg; 44: mounting leg; 46: inclined surface; 47: slit; 48: pattern; 48a: inner pattern; 48b: outer pattern; 50: (electric working machine) motor; 51: sensor substrate; 52: substrate body; 52a: outer periphery; 53: frame; J: motor axis. DETAILED DESCRIPTION

[0010] According to another feature of the present disclosure, the stator has a cylindrical outer cylinder portion. The stator has teeth that protrude radially inward from the outer cylinder portion and are wound with coils. When viewed from the axial direction, the inner peripheral end of the tooth is exposed. Therefore, the area of ​​the tooth exposed when viewed from the axial direction can be expanded. Accordingly, the coils wound on the teeth can be efficiently cooled by more cooling air.

[0011] According to another feature of the present disclosure, the sensor substrate has mounting legs, which protrude radially outward from the substrate body and are mounted on the stator. Therefore, by setting the mounting legs to protrude radially outward from the substrate body, cooling air can flow in the area adjacent to the mounting legs in the circumferential direction. Therefore, the flow rate of cooling air can be increased while improving the stability of the structure supporting the sensor substrate.

[0012] According to another feature of the present disclosure, the stator has a cylindrical outer cylinder portion. The stator has a plurality of teeth protruding radially inward from the outer cylinder portion and wound with coils. The leg portion and the mounting leg are arranged at a position avoiding the center of the radial inner peripheral end of the plurality of teeth when viewed from the axial direction. Therefore, the leg portion and the mounting leg are arranged at a position avoiding the flow path of the cooling air flowing axially toward each tooth. Therefore, the coils wound around each tooth can be efficiently cooled by the cooling air. Accordingly, the cooling efficiency of the motor can be improved.

[0013] According to another feature of the present disclosure, the sensor substrate has at least one leg. The sensor substrate has at least one mounting leg. When viewed from the axial direction, all the legs and all the mounting legs avoid the center of the inner peripheral ends of the plurality of teeth, so that the centers of the inner peripheral ends of the plurality of teeth are all exposed. Therefore, when viewed from the axial direction, the centers of the inner peripheral ends of all the teeth are exposed. Therefore, the sensor of the leg can be arranged at a position where the rotation of the rotor can be well detected, and the stability of the support structure of the sensor substrate using the mounting legs is improved, while further improving the cooling efficiency of the motor.

[0014] According to another feature of the present disclosure, the motor for an electric working machine has an outer cylinder portion of a cylindrical stator. The motor for an electric working machine has a plurality of teeth, and the plurality of teeth protrude radially inward from the outer cylinder portion and are wound with coils. The motor for an electric working machine has a rotor arranged on the inner circumference side of the plurality of teeth. The motor for an electric working machine has a sensor substrate disposed at the axial end of the stator. The sensor substrate has a substrate body, which is annular and, when viewed from the axial direction, is radially inward along the inner circumferential ends of the plurality of teeth. The center of at least one inner circumferential end of the plurality of teeth is exposed radially outward of the substrate body. The motor for an electric working machine has a sensor, which is disposed on the sensor substrate and opposite to the rotor, and is used to detect the rotation of the rotor.

[0015] Therefore, in the radial direction, a gap is provided between the substrate body and the inner peripheral ends of the plurality of teeth. The gap can be utilized to expand the exposed area of ​​the teeth. Accordingly, the wind tunnel resistance of the motor can be suppressed. Furthermore, when viewed from the axial direction, the center of at least one inner peripheral end of the plurality of teeth is exposed. Therefore, cooling air can flow near the center of the inner peripheral end of each tooth. Accordingly, the coil wound around each tooth can be efficiently cooled. In this way, even when the output of the motor is set to a high output, damage to the motor and the like can be suppressed.

[0016] According to another feature of the present disclosure, the sensor substrate has a leg portion protruding radially outward from the substrate body. A sensor is provided on the leg portion. Therefore, the sensor can be arranged on the leg portion at a position where the rotation of the rotor can be well detected, and a gap can be provided at a position adjacent to each leg portion in the circumferential direction. Accordingly, the flow rate of cooling air flowing into the motor can be increased.

[0017] According to another feature of the present disclosure, the sensor substrate has at least one mounting leg, at least one of which protrudes radially outward from the substrate body and is mounted on the stator. The sensor substrate has at least one leg, at least one of which protrudes radially outward from the substrate body and is provided with a sensor. When viewed from the axial direction, all legs and all mounting legs avoid the center of the inner circumferential ends of the plurality of teeth, so that the centers of the inner circumferential ends of the plurality of teeth are all exposed. Therefore, when viewed from the axial direction, the centers of the inner circumferential ends of all teeth are exposed. Therefore, all coils wound around each tooth can be efficiently cooled. Accordingly, the cooling efficiency of the motor can be further improved.

[0018] According to another feature of the present disclosure, the motor for the electric working machine has three sensors. The sensor substrate has three legs on which the sensors are provided. Therefore, by providing the three sensors, the rotation of the rotor can be well detected. Furthermore, by providing the three sensors respectively on the legs, the gap between the positions adjacent to the legs in the circumferential direction can be enlarged. Therefore, the flow rate of cooling air flowing into the motor can be increased.

[0019] According to another feature of the present disclosure, the motor for an electric working machine has a cylindrical stator. The motor for an electric working machine has a rotor arranged on the inner peripheral side of the stator. The motor for an electric working machine has a sensor substrate arranged at the axial end of the stator. The sensor substrate has a substrate body located radially inward of the inner peripheral edge of the stator when viewed from the axial direction. The sensor substrate has an outer side surface of the substrate body located on the opposite side of the rotor. The sensor substrate has an inclined surface, which is inclined toward the axial inner side of the rotor as the outer side surface of the substrate body is closer to the radial outside. When viewed from the axial direction, a gap is formed between the outer peripheral edge of the substrate body and the inner peripheral edge of the stator. The motor for an electric working machine has a sensor, which is arranged on the sensor substrate and opposite to the rotor, and is used to detect the rotation of the rotor.

[0020] Therefore, an inclined surface inclined toward the axial inner side of the motor is provided on the outer side surface of the substrate body. Accordingly, the cooling wind flowing toward the substrate body can be guided by the inclined surface. Accordingly, the wind tunnel resistance of the motor can be suppressed. Moreover, the closer the inclined surface is to the radial outer side, the more it is inclined toward the axial inner side where the rotor is located. Therefore, the cooling wind can be guided to flow along the inner periphery of the stator located radially outside the inclined surface. In this way, the flow rate of the cooling wind can be increased, and the cooling efficiency of the motor can be improved. Accordingly, even when the output of the motor is set to a high output, damage to the motor and the like can be suppressed.

[0021] According to another feature of the present disclosure, the motor for the electric working machine has a frame covering the surface of the substrate body. The inclined surface is formed by the shape of the outer side surface of the substrate body or the shape of the frame. Therefore, even in the substrate body covered by the frame, an inclined surface for guiding cooling air can be provided on the outer side surface to suppress wind tunnel resistance.

[0022] According to another feature of the present disclosure, the sensor substrate has a mounting leg, which protrudes radially outward from the substrate body and is mounted on the stator. The inclined surface is arranged away from the mounting leg. Therefore, the inclined surface can be arranged at a location where cooling air needs to be guided to improve cooling efficiency while maintaining the strength of the mounting leg.

[0023] According to another feature of the present disclosure, the sensor substrate has a leg portion protruding radially outward from the substrate body. The leg portion is provided with a sensor. Therefore, the sensor can be provided on the leg portion, and the leg portion is arranged at a position where the rotation of the rotor can be well detected and where the cooling air guided into the motor by the inclined surface of the substrate body is not obstructed. Accordingly, the wind tunnel resistance can be suppressed and the cooling efficiency of the motor can be improved.

[0024] According to another feature of the present invention, the inclined surface is inclined relative to the radial direction on the entire surface from the inner periphery to the outer periphery of the substrate body. Therefore, the cooling wind flowing toward the substrate body in the axial direction can be smoothly guided to flow toward the radial outer side of the substrate body. Therefore, the wind tunnel resistance in the substrate body can be suppressed. Accordingly, the cooling efficiency of the motor can be improved.

[0025] Next, refer to Figures 1 to 8 The first embodiment of the present disclosure is described. As an example of the electric working machine 1, a chain saw that drives a saw chain 3 by motor output is illustrated. In the following description, the direction in which the guide plate 2 supporting the saw chain 3 protrudes is set to the front. The user is located behind the electric working machine 1 (at Figure 1 The electric working machine 1 is held by the user (the right side is the inner side). The up, down, left, and right directions are based on the direction observed by the user. In addition, in the following description, the left direction is also referred to as the first direction, and the right direction is referred to as the second direction.

[0026] like Figure 1As shown, the electric working machine 1 has a working machine body 10 accommodated in a main body housing 11. A guide bar 2 protrudes forward from the front end of the main body housing 11. A saw chain 3 is installed along the outer periphery of the guide bar 2. The saw chain 3 is guided to move in the circumferential direction along the outer periphery of the guide bar 2. The saw chain 3 is driven by the output of a motor 20 provided in the working machine body 10.

[0027] like Figure 1 As shown, the electric working machine 1 has a front handle 4. The front handle 4 is formed in a ring shape at the front part of the main body shell 11. The front handle 4 extends upward from the lower end of the left side surface of the main body shell 11, extends rightward on the upper part of the main body shell 11 and is connected to the upper end of the right side surface of the main body shell 11. The electric working machine 1 has a hand guard 5. The hand guard 5 is provided in front of the upper part of the front handle 4. The hand guard 5 extends upward from the upper end of the front part of the main body shell 11. The hand guard 5 is used to protect the user's hand holding the front handle 4.

[0028] like Figure 1 As shown, the electric working machine 1 has a rear handle 6 at the rear of the working machine body 10. The rear handle 6 is formed into a ring extending backward from the rear end of the main body shell 11. A trigger lock operating handle 7 is provided on the upper part of the rear handle 6, and the trigger lock operating handle 7 can be pressed by the hand holding the rear handle 6. A trigger 8 is provided on the inner peripheral side of the ring of the rear handle 6, and the trigger 8 can be pulled by the finger of the hand holding the rear handle 6. The user holds the rear handle 6 and presses the trigger lock operating handle 7. In this state, the trigger 8 can be pulled with a finger. By pulling the trigger 8 with a finger, the motor 20 is supplied with a driving current and driven. When the trigger lock operating handle 7 is not operated, the pulling operation of the trigger 8 is restricted.

[0029] like Figure 1 As shown, a battery mounting portion 12 is provided on the working machine body 10, and the battery mounting portion 12 can be equipped with a rechargeable battery 13 in a detachable manner. The battery mounting portion 12 is recessed in the upper surface of the working machine body 10. The battery 13 can be installed in the battery mounting portion 12 by sliding from the top to the bottom. The battery 13 can be removed from the battery mounting portion 12 by sliding from the bottom to the top in the opposite direction of the installation direction. The motor 20 described later is driven by supplying a driving current from the battery 13 installed in the battery mounting portion 12. The battery 13 is, for example, a lithium-ion battery with an output voltage of 40V. The battery 13 can be removed from the battery mounting portion 12 and repeatedly charged by a charger prepared separately. The battery 13 can be commonly used as a power source between other electric working machines such as screw tightening machines and electric drills.

[0030] like Figure 1 , 2As shown, a motor 20 for an electric working machine is housed in the main body housing 11. The motor 20 is arranged in front of the battery mounting portion 12 and below the front handle 4. The motor 20 is housed in a substantially cylindrical motor housing 21 with a motor shaft 27 extending in the left-right direction. The axial direction of the motor shaft 27 is parallel to the left-right direction. Bearings 27a and 27b are mounted on the inner side of the motor housing 21. The motor shaft 27 is supported by the bearings 27a and 27b so as to be rotatable around a motor axis J extending left-right. The right end of the motor shaft 27 protrudes from the motor housing 21. A sprocket 29 for transmitting power to the saw chain 3 is mounted on the right end of the motor shaft 27. The motor shaft 27 rotates around the motor axis J, thereby driving the saw chain 3 via the sprocket 29.

[0031] like Figure 2 As shown, the main housing 11 contains a controller 14. The controller 14 is provided in a manner that a substrate is contained in a shallow rectangular box-shaped housing. The controller 14 is arranged above the motor housing 21 in a posture extending in a substantially horizontal direction with the vertical direction as the thickness direction. The controller 14 outputs a signal to control the electric working machine 1. The controller 14 is controlled by the trigger 8 (see Figure 1 ) is pressed to supply a driving current from the battery 13 to the motor 20. The controller 14 receives a signal for detecting the rotation of the rotor 28 from a sensor 35 described later. The rotation of the rotor 28 detected here includes the rotation position or the rotation speed of the rotor 28, or both. The controller 14 controls the driving current supplied to the motor 20 according to the rotation of the rotor 28.

[0032] like Figure 2 , 3 As shown, the motor 20 is an inner rotor type DC brushless motor. The motor 20 has a cylindrical stator 22. The stator 22 is housed in a motor housing 21. A rotor 28 is provided on the inner circumference of the stator 22. The rotor 28 is integrally mounted on the motor shaft 27. The rotor 28 can rotate around the motor axis J relative to the stator 22. A cooling fan 15 is integrally mounted on the motor shaft 27. The cooling fan 15 is a centrifugal fan. The cooling fan 15 is arranged on the right side of the right end of the stator 22 and on the left side of the bearing 27b on the right side. The cooling fan 15 rotates integrally with the motor shaft 27, thereby generating cooling air that flows axially from left to right in the motor housing 21. The cooling air flowing to the cooling fan 15 is sent radially outward by the cooling fan 15.

[0033] like Figure 1 , 2As shown, an air inlet 11a is provided on the left side of the main housing 11. The air inlet 11a is arranged on the left side of the motor 20. The air inlet 11a is provided to penetrate the main housing 11 in the left-right direction. When the cooling fan 15 rotates, external air is introduced into the main housing 11 from the air inlet 11a. An exhaust port 11b is provided on the lower surface of the main housing 11. The exhaust port 11b is arranged on the radially outer side of the cooling fan 15. The cooling air sent to the radially outer side by the cooling fan 15 is discharged to the outside of the main housing 11 from the exhaust port 11b.

[0034] like Figure 2 As shown, the rotor 28 has a rotor core 28b including a plurality of stacked steel plates. The rotor core 28b is arranged on the inner circumference side of the stator 22 so as to surround the motor shaft 27. The rotor 28 has a plurality of magnets 28c. The magnets 28c are permanent magnets. The magnets 28c are arranged inside the rotor core 28b. The plurality of magnets 28c are arranged in the circumferential direction so as to surround the motor shaft 27. In this embodiment, eight magnets 28c are provided.

[0035] like Figure 2 , 3 As shown, the stator 22 has a first end 22a at one end on the left side (first direction). The stator 22 has a second end 22b at one end on the right side (second direction) opposite to the first direction. The outer periphery of the stator 22 is covered by a substantially cylindrical outer cylinder 23. The stator 22 has a stator core 22d including a plurality of stacked steel plates. The stator core 22d is arranged along the inner periphery of the outer cylinder 23.

[0036] like Figure 2 , 4 As shown, the stator 22 has a plurality of teeth 24 protruding radially inward from the outer cylinder portion 23. The plurality of teeth 24 are arranged at equal intervals in the circumferential direction. In the present embodiment, 12 teeth 24 are arranged. The plurality of teeth 24 are arranged at intervals of 30° in the circumferential direction with the motor axis J as the center. The inner peripheral end 24a of each tooth 24 is located slightly radially outward from the outer peripheral edge 28a of the rotor 28. A coil 25 is wound around each tooth 24. A driving current is supplied to each coil 25 from the battery 13 through the controller 14 (see Figure 1 ).

[0037] like Figure 3 , 4 As shown, a substantially annular insulator 26 is integrally mounted at the end in the first direction of the stator 22. The insulator 26 is made of an insulating material such as a synthetic resin, for example. The insulator 26 is fixed to the stator core 22d by insert molding. The end face in the first direction of the insulator 26 is the first end 22a of the stator 22 in the present disclosure. The inner peripheral edge 26a of the insulator 26 is located radially inward of the inner peripheral edge of the outer cylinder 23. The inner peripheral edge 26a of the insulator 26 is the inner peripheral edge 22c of the stator 22 in the present disclosure.

[0038] like Figure 3 , 4 As shown in FIG. 1 , the insulator 26 has a connection portion 26 b protruding radially outward. The connection portion 26 b electrically connects the coil 25 and the sensor 35 described later to the controller 14 and the battery 13 (see FIG. 1 ). Figure 1 ). The insulator 26 has a substrate connection portion 26c on which a sensor substrate 30 described later can be mounted. The substrate connection portion 26c protrudes radially inward from the inner peripheral edge 26a of the insulator 26. In this embodiment, five substrate connection portions 26c are provided. Each substrate connection portion 26c is provided at intervals of approximately 60° in the circumferential direction with the motor axis J as the center. No substrate connection portion 26c is provided on the inner circumferential side of the portion where the connection portion 26b is provided.

[0039] like Figure 3 to Figure 5 As shown in FIG. 1 , the motor 20 has a plurality of sensors 35. The sensors 35 are magnets 28c (see FIG. 1 ) that detect the rotor 28. Figure 2 ) is a magnetic sensor, such as a Hall IC. The sensor 35 detects the rotation of the rotor 28 by detecting the magnet 28c. A plurality of sensors 35 are provided on a plate-shaped sensor substrate 30. In the present embodiment, three sensors 35 are provided. The three sensors 35 are arranged at intervals of 60° in the circumferential direction with the motor axis J as the center. The sensor substrate 30 is arranged in a first direction relative to the rotor 28. The sensor substrate 30 is integrally mounted and supported on the insulator 26. The sensor substrate 30 and the three sensors 35 constitute a sensor unit. The sensor unit includes a frame 34, a diode 36, a signal line 37, a pattern 39, etc., which will be described later.

[0040] like Figure 3 to Figure 6 As shown, the sensor substrate 30 is provided by processing a flat substrate material. The sensor substrate 30 is provided by, for example, a substrate material formed by infiltrating epoxy resin into glass fiber and thermally curing. The sensor substrate 30 has an annular substrate body 31 with a circular through hole formed in the center. The inner peripheral edge 31b of the substrate body 31 corresponds to the side surface of the circular through hole. The motor shaft 27 is inserted into the inner peripheral side of the inner peripheral edge 31b of the substrate body 31.

[0041] like Figure 3 to Figure 8 As shown, the sensor substrate 30 has a plurality of legs 32 protruding radially outward from the outer peripheral edge 31a of the substrate body 31. In the present embodiment, four legs 32 are provided. A sensor 35 is provided on each of the three legs 32. The sensor 35 is provided on the inner side surface 30b on the second direction side of the leg 32, opposite to the magnet 28c. A signal line 37 extends radially outward from one leg 32. The signal line 37 is electrically connected to the connecting portion 26b of the insulator 26. The sensor 35 is connected to the controller 14 (see Figure 2 )Electrical connection.

[0042] like Figure 5 , Figure 8 As shown, the sensor unit has a plurality of diodes 36. Each diode 36 is provided near each sensor 35 on the sensor substrate 30 and is electrically connected to each sensor 35. In this embodiment, three diodes 36 are provided. The diodes 36 are provided on the inner side surface 30b of the substrate body 31 on the second direction side.

[0043] like Figure 5 , 7 As shown in FIGS. 8 and 9 , a pattern 39 is provided on the surface of the sensor substrate 30. The sensor 35, the diode 36, and the signal line 37 are electrically connected to each other through the pattern 39. The inner pattern 39a provided on the inner side surface 30b of the sensor substrate 30 includes an arc-shaped portion extending in the circumferential direction of the substrate body 31. The inner pattern 39a further extends from the arc-shaped portion of the substrate body 31 to the sensor 35 or the signal line 37 of each leg 32. An outer pattern 39b is provided on the outer side surface 30a of the sensor substrate 30 in the first direction. The outer pattern 39b also includes an arc-shaped portion extending in the circumferential direction of the substrate body 31 and a portion extending from the arc-shaped portion to the sensor 35 or the signal line 37 of each leg 32.

[0044] like Figure 3 to Figure 8 As shown in FIG. 1 , the sensor substrate 30 has a plurality of mounting legs 33 protruding radially outward from the outer peripheral edge 31a of the substrate body 31. In the present embodiment, five mounting legs 33 are provided. Each mounting leg 33 is attached to the substrate connection portion 26c of the insulator 26 by, for example, screws or the like. A circumferential interval is provided between the mounting legs 33 or between the mounting legs 33 and the leg portion 32. A slit 38 is formed in the circumferential interval so as to allow air to be introduced from the outside of the sensor substrate 30 to the inside of the motor 20.

[0045] like Figure 4 , 6 As shown, the sensor unit has a resin frame 34 that covers the outer side surface 30a on the first direction side and the inner side surface 30b on the second direction side. The frame 34 is provided on the substrate body 31 and the leg 32. The frame 34 is not provided on the mounting leg 33. Since the frame 34 is not provided on the mounting leg 33, it is easy to fasten the mounting leg 33 and the substrate connecting portion 26c by screw fastening. The frame 34 does not cover the outer peripheral edge 31a of the substrate body 31 and the circumferential end surface of the leg 32. Thus, it is possible to suppress the opening area of ​​the slit 38 from being narrowed due to the frame 34. In addition, in Figure 5 , 7 , 8, the frame 34 is omitted for illustration.

[0046] like Figure 2 , 4As shown in FIGS. 5 and 6 , the slit 38 is provided between the inner peripheral edge 22c of the stator 22 and the outer peripheral edge 31a of the substrate body 31 in the radial direction. The slit 38 is provided between the mounting legs 33 in the circumferential direction or between the mounting legs 33 and the leg portion 32 in the circumferential direction. When viewed from the first direction side, the inner peripheral edge 22c of the stator 22 is exposed on both sides of the leg portion 32 in the circumferential direction. When viewed from the first direction side, the inner peripheral edge 22c of the stator 22 is exposed on both sides of the mounting leg 33 in the circumferential direction. The outer peripheral edge 31a of the substrate body 31 is located radially inward of the center of the inner peripheral end 24a of the tooth 24. When viewed from the first direction side, the center of the inner peripheral end 24a of all the teeth 24 is exposed from the slit 38. In other words, all the leg portions 32 and the mounting legs 33 are arranged at positions that avoid the center of the inner peripheral end 24a of each tooth 24 when viewed from the first direction side.

[0047] The cooling wind generated by the rotation of the cooling fan 15 flows into the stator 22 through the slits 38. The wind tunnel resistance of the motor 20 is suppressed by passing through the slits 38. Therefore, the cooling wind can be sufficiently blown to the coil 25 wound around each tooth 24 to cool it. The cooling wind that has passed through the slits 38 can cool not only the coil 25 but also the sensor 35 provided on the sensor substrate 30, for example. The cooling wind that has cooled the motor 20 flows to the cooling fan 15 and is discharged from the exhaust port 11b.

[0048] As mentioned above, Figure 3 to Figure 5 As shown, the motor 20 for the electric working machine has a cylindrical stator 22. The motor 20 has a rotor 28 arranged on the inner circumferential side of the stator 22. The motor 20 has a sensor substrate 30 provided at an axial end of the stator 22. The sensor substrate 30 has a substrate body 31 located radially inside the stator 22 when viewed from the axial direction. The sensor substrate 30 has a leg 32 protruding radially outward from the substrate body 31 toward the stator 22. The stator 22 is exposed on at least one side of the leg 32 in the circumferential direction. The motor 20 has a sensor 35, which is provided on the leg 32 and opposite to the rotor 28, and is used to detect the rotation of the rotor 28.

[0049] Therefore, cooling air enters the stator 22 from a portion where the stator 22 is exposed in at least one direction in the circumferential direction of the leg 32. Therefore, the wind tunnel resistance of the motor 20 can be suppressed. In addition, the sensor 35 is provided on the leg 32 protruding radially outward from the substrate body 31 of the sensor substrate 30. In addition, the stator 22 is exposed in at least one direction in the circumferential direction of the leg 32. Therefore, the sensor 35 can be arranged at a position where the rotation of the rotor 28 can be well detected and the stator 22 can be exposed in a wider area along the inner peripheral edge 22c of the stator 22. Accordingly, the cooling air can flow along the inner peripheral edge 22c of the stator 22, and the flow rate of the cooling air flowing in the motor 20 can be further increased. Accordingly, even when the output of the motor 20 is set to a high output, damage to the motor 20 and the like can be suppressed.

[0050] like Figure 2 to Figure 5 As shown, the stator 22 has a cylindrical outer cylinder portion 23. The stator 22 has teeth 24, which protrude radially inward from the outer cylinder portion 23 and are wound with coils 25. When viewed from the axial direction, the inner peripheral end 24a of the tooth 24 is exposed. Therefore, the area of ​​the tooth 24 exposed when viewed from the axial direction can be increased. According to this, the coil 25 wound on the tooth 24 can be efficiently cooled by more cooling air.

[0051] like Figure 3 , 4 As shown in FIG. 1 , the sensor substrate 30 has mounting legs 33 protruding radially outward from the substrate body 31 and mounted on the stator 22. Therefore, by providing the mounting legs 33 in a shape protruding radially outward from the substrate body 31, the cooling air can flow in a region adjacent to the mounting legs 33 in the circumferential direction. Therefore, the stability of the structure supporting the sensor substrate 30 can be improved while increasing the flow rate of the cooling air.

[0052] like Figure 2 to Figure 5 As shown, the stator 22 has a cylindrical outer cylinder portion 23. The stator 22 has a plurality of teeth 24 protruding radially inward from the outer cylinder portion 23 and wound with coils 25. The leg portion 32 and the mounting leg 33 are arranged at a position avoiding the center of the radial inner peripheral end 24a of the plurality of teeth 24 when viewed from the axial direction. Therefore, the leg portion 32 and the mounting leg 33 are arranged at a position avoiding the flow path of the cooling air flowing axially toward each tooth 24. Therefore, the coil 25 wound around each tooth 24 can be efficiently cooled by the cooling air. Accordingly, the cooling efficiency of the motor 20 can be improved.

[0053] like Figure 4 , 5As shown, the sensor substrate 30 has at least one leg 32. The sensor substrate 30 has at least one mounting leg 33. When viewed from the axial direction, all the legs 32 and all the mounting legs 33 avoid the center of the inner peripheral ends 24a of the plurality of teeth 24, so that the center of the inner peripheral ends 24a of the plurality of teeth 24 is fully exposed. Therefore, when viewed from the axial direction, the center of the inner peripheral ends 24a of all the teeth 24 is exposed. Therefore, the sensor 35 of the leg 32 can be arranged at a position where the rotation of the rotor 28 can be well detected, and the stability of the support structure of the sensor substrate 30 using the mounting legs 33 is improved, while the cooling efficiency of the motor 20 is further improved.

[0054] like Figure 2 to Figure 5 As shown, the motor 20 has an outer cylinder portion 23 of a cylindrical stator 22. The motor 20 has a plurality of teeth 24 protruding radially inward from the outer cylinder portion 23 and wound with a coil 25. The motor 20 has a rotor 28 arranged on the inner peripheral side of the plurality of teeth 24. The motor 20 has a sensor substrate 30 provided at an axial end of the stator 22. The sensor substrate 30 has a substrate body 31, which is annular and extends radially inward along the inner peripheral ends 24a of the plurality of teeth 24 when viewed from the axial direction. The center of at least one inner peripheral end 24a of the plurality of teeth 24 is exposed radially outward of the substrate body 31. The motor 20 has a sensor 35, which is provided on the sensor substrate 30 and opposite to the rotor 28, and is used to detect the rotation of the rotor 28.

[0055] Therefore, in the radial direction, a gap is provided between the substrate body 31 and the inner peripheral ends 24a of the plurality of teeth 24. The exposed area of ​​the teeth 24 can be enlarged by utilizing the gap. Accordingly, the wind tunnel resistance of the motor 20 to the cooling wind can be suppressed. Furthermore, when viewed from the axial direction, the center of at least one inner peripheral end 24a of the plurality of teeth 24 is exposed. Therefore, the cooling wind can flow near the center of the inner peripheral end 24a of each tooth 24. Accordingly, the coil 25 wound around each tooth 24 can be efficiently cooled. In this way, even when the output of the motor 20 is set to a high output, damage to the motor 20 and the like can be suppressed.

[0056] like Figures 4 to 8 As shown, the sensor substrate 30 has a leg portion 32 protruding radially outward from the substrate body 31. The sensor 35 is provided on the leg portion 32. Therefore, the sensor 35 can be arranged on the leg portion 32 at a position where the rotation of the rotor 28 can be well detected, and a gap can be provided at a position adjacent to the leg portion 32 in the circumferential direction. According to this, the flow rate of cooling air flowing into the motor 20 can be increased.

[0057] like Figure 4 , 5As shown, the sensor substrate 30 has at least one mounting leg 33 protruding radially outward from the substrate body 31 and mounted on the stator 22. The sensor substrate 30 has at least one leg 32 protruding radially outward from the substrate body 31 and provided with a sensor 35. When viewed from the axial direction, all the legs 32 and all the mounting legs 33 avoid the center of the inner peripheral ends 24a of the plurality of teeth 24, so that the centers of the inner peripheral ends 24a of the plurality of teeth 24 are all exposed. Therefore, when viewed from the axial direction, the centers of the inner peripheral ends 24a of all the teeth 24 are exposed. Therefore, all the coils 25 wound around the teeth 24 can be efficiently cooled. Accordingly, the cooling efficiency of the motor 20 can be further improved.

[0058] like Figures 4 to 8 As shown in FIG. 1 , the motor 20 has three sensors 35. The sensor substrate 30 has three legs 32 on which the sensors 35 are provided. Therefore, by providing the three sensors 35, the rotation of the rotor 28 can be well detected. Furthermore, by providing the three sensors 35 in the legs 32, respectively, the gap between the positions adjacent to the legs 32 in the circumferential direction can be enlarged. Therefore, the flow rate of the cooling air flowing into the motor 20 can be increased.

[0059] Next, refer to Figures 9 to 13 A second embodiment of the present disclosure will be described. Figure 6 The motor 40 for an electric working machine of the second embodiment includes a sensor substrate 41, as shown in the sensor substrate 30. In the following description, only the parts different from the first embodiment will be described in detail.

[0060] like Figures 9 to 13 As shown, the motor 40 has three sensors 35 arranged on a sensor substrate 41. The sensor substrate 41 and the three sensors 35 constitute a sensor unit. The sensor unit includes a frame, a diode 36, a signal line, and a pattern 48 described later. The sensor substrate 41 is arranged on the first direction side relative to the rotor 28. The sensor substrate 41 is integrally mounted and supported on the insulator 26. The sensor substrate 41 is a three-dimensional molded component made of synthetic resin called MID (Molded Interconnect Device). The sensor substrate 41 has an annular substrate body 42 with a circular through hole formed in the center. The inner peripheral edge 42b of the substrate body 42 is equivalent to the side of the circular through hole, and the motor shaft 27 is inserted through the inner peripheral side.

[0061] like Figures 9 to 13 As shown in FIG. 1 , the sensor substrate 41 has a plurality of legs 43 protruding radially outward from the outer peripheral edge 42a of the substrate body 42. In this embodiment, three legs 43 are provided. A sensor 35 is provided on each of the three legs 43. The sensor 35 is provided on the inner side surface 41b of the leg 43 on the second direction side and is aligned with the magnet 28c (see FIG. 1 ). Figure 2 ) are opposite. One of the legs 43 is formed into a rectangular shape that is long in the circumferential direction. The signal line 37 extends radially outward from the rectangular leg 43. The sensor unit has three diodes 36. Each diode 36 is provided on the inner side surface 41b of the substrate body 42.

[0062] like Fig.10 , 12 As shown in FIGS. 1 and 13, a pattern 48 is provided on the surface of the sensor substrate 41. The sensor 35, the diode 36, and the signal line 37 are electrically connected through the pattern 48. The inner pattern 48a provided on the inner side surface 41b of the sensor substrate 41 includes an arc-shaped portion extending in the circumferential direction of the substrate body 42, and a portion extending from the arc-shaped portion to the sensor 35 or the signal line 37 of each leg 43. An outer pattern 48b is provided on the outer side surface 41a on the first direction side of the sensor substrate 41. The outer pattern 48b also includes an arc-shaped portion extending in the circumferential direction of the substrate body 42, and a portion extending from the arc-shaped portion to the sensor 35 or the signal line 37 of each leg 43.

[0063] like Figures 9 to 13 As shown in FIG. 1 , the sensor substrate 41 has a plurality of mounting legs 44 protruding radially outward from the outer peripheral edge 42a of the substrate body 42. In the present embodiment, three mounting legs 44 are provided. Each mounting leg 44 is attached to the substrate connection portion 26c of the insulator 26 by, for example, screws or the like. The mounting legs 44 are located at a position closer to the first direction side than the inner side surface 41b of the sensor substrate 41 on which the sensor 35 is provided. Therefore, compared with the first embodiment, the screw fixing position can be arranged at a position farther from the rotor 28 than the sensor 35. In this way, by providing the sensor substrate 41 with the MID, the arrangement of the sensor 35, the arrangement of the screw fixing position, the thickness of the substrate body 42, etc. can be set with a high degree of freedom. A circumferential interval is provided between the mounting legs 44 or between the mounting legs 44 and the leg portion 43. A slit 47 capable of introducing air from the outer side of the sensor substrate 41 to the inner side of the motor 40 is formed in the circumferential interval.

[0064] like Fig.12 , 13As shown, an inclined surface 46 inclined with respect to the radial direction is provided on the outer side surface 41a on the first direction side of the sensor substrate 41. The inclined surface 46 is provided on the substrate body 42 and the leg portion 43. The inclined surface 46 is formed to avoid the mounting leg 44 and is not provided on the mounting leg 44. The inclined surface 46 is inclined in the second direction axially inward toward the slit 47 on the radial outer side. In the substrate body 42, the inclined surface 46 is provided at a substantially uniform inclination angle across the entire surface from the inner peripheral edge 42b to the outer peripheral edge 42a. In the leg portion 43, the inclined surface 46 is provided at a substantially uniform inclination angle across the entire surface from the inner peripheral edge 42b to the outer peripheral edge which is the same as the substrate body 42. In addition, in this embodiment, the illustration of the resin frame covering the outer side surface 41a and the inner side surface 41b of the sensor substrate 41 is omitted. The frame is provided on the substrate body 42 and the leg portion 43, but is not provided on the mounting leg 44. The outer side surface of the frame is provided substantially parallel to the inclined surface 46 and is inclined toward the slit 47 on the radial outer side.

[0065] like Fig. 9 , 10 As shown, the slit 47 is provided between the inner peripheral edge 22c of the stator 22 and the outer peripheral edge 42a of the substrate body 42 in the radial direction. The slit 47 is provided between the mounting legs 44 in the circumferential direction or between the mounting legs 44 and the leg portion 43 in the circumferential direction. When viewed from the first direction side, the inner peripheral edge 22c of the stator 22 is exposed on both sides of the leg portion 43 in the circumferential direction. When viewed from the first direction side, the inner peripheral edge 22c of the stator 22 is exposed on both sides of the mounting leg 44 in the circumferential direction. The outer peripheral edge 42a of the substrate body 42 is located radially inward of the center of the inner peripheral end 24a of the tooth 24. When viewed from the first direction side, the inner peripheral ends 24a of all the teeth 24 are exposed from the slit 47. For the ten teeth 24 other than the two teeth 24 overlapping the circumferentially long rectangular leg portion 43, the center of the inner peripheral end 24a is exposed from the slit 47 when viewed from the first direction side.

[0066] As mentioned above, Figures 9 to 11As shown, the motor 40 for the electric working machine has a cylindrical stator 22. The motor 40 has a rotor 28 arranged on the inner peripheral side of the stator 22. The motor 40 has a sensor substrate 41 provided at the axial end of the stator 22. The sensor substrate 41 has a substrate body 42 located radially inward of the inner peripheral edge 22c of the stator 22 when viewed from the axial direction. The sensor substrate 41 has an outer side surface 41a of the substrate body 42 located on the opposite side of the rotor 28. The sensor substrate 41 has an inclined surface 46, which is inclined toward the axial inner side (second direction side) where the rotor 28 is located as the outer side surface 41a of the substrate body 42 is closer to the radial outer side. When viewed from the axial direction, a gap (slit 47) is formed between the outer peripheral edge 42a of the substrate body 42 and the inner peripheral edge 22c of the stator 22. The motor 40 has a sensor 35, which is provided on the sensor substrate 41 and opposite to the rotor 28, and is used to detect the rotation of the rotor 28.

[0067] Therefore, an inclined surface 46 inclined toward the axial inner side of the motor 40 is provided on the outer side surface 41a of the substrate body 42. Accordingly, the cooling wind flowing toward the substrate body 42 can be guided by the inclined surface 46. Accordingly, the wind tunnel resistance of the motor 40 can be suppressed. Moreover, the inclined surface 46 is inclined toward the axial inner side where the rotor 28 is located as it is closer to the radial outer side. Therefore, the cooling wind can be guided to flow along the inner peripheral edge 22c of the stator 22 located radially outside the inclined surface 46. In this way, the flow rate of the cooling wind can be increased, and the cooling efficiency of the motor 40 can be improved. Accordingly, even when the output of the motor 40 is set to a high output, damage to the motor 40 and the like can be suppressed.

[0068] like Fig.12 , 13 As shown, the motor 40 has a frame covering the surface of the substrate body 42. The inclined surface 46 is formed by the shape of the outer side surface 41a of the substrate body 42 or the shape of the frame. Therefore, even in the substrate body 42 covered by the frame, the inclined surface 46 for guiding the cooling wind can be provided on the outer side surface 41a to suppress the wind tunnel resistance.

[0069] like Fig.12 , 13 As shown, the sensor substrate 41 has mounting legs 44 that protrude radially outward from the substrate body 42 and are mounted on the stator 22. The inclined surface 46 is provided to avoid the mounting legs 44. Therefore, the inclined surface 46 can be provided at a location where cooling air needs to be guided to improve cooling efficiency while maintaining the strength of the mounting legs 44.

[0070] like Figures 9 to 13As shown in FIG. 1 , the sensor substrate 41 has a leg portion 43 protruding radially outward from the substrate body 42. The sensor 35 is provided on the leg portion 43. Therefore, the sensor 35 can be provided on the leg portion 43, which is arranged at a position where the rotation of the rotor 28 can be well detected and where the cooling air guided into the motor 40 by the inclined surface 46 of the substrate body 42 is not blocked. Thus, the wind tunnel resistance can be suppressed and the cooling efficiency of the motor 40 can be improved.

[0071] like Fig. 9 , 12 As shown, the inclined surface 46 is inclined with respect to the radial direction over the entire surface from the inner peripheral edge 42b to the outer peripheral edge 42a of the substrate body 42. Therefore, the cooling wind flowing toward the substrate body 42 in the axial direction can be smoothly guided to flow toward the radial outer side of the substrate body 42. Therefore, the wind tunnel resistance in the substrate body 42 can be suppressed. Accordingly, the cooling efficiency of the motor 40 can be improved.

[0072] As a comparison with the various embodiments of the present disclosure, Fig.14 A motor 50 for an electric working machine of a prior art example is shown. A sensor substrate 51 provided in the motor 50 of the prior art has a disc-shaped substrate body 52. ​​A plurality of sensors 35 are provided on the inner side of the substrate body 52. ​​The outer side and the inner side of the substrate body 52 are covered by a frame 53. The substrate body 52 is connected to each substrate connection portion 26c of the insulator 26 near the outer peripheral edge 52a. Therefore, only a small gap is provided in the radial direction between the outer peripheral edge 52a of the substrate body 52 and the inner peripheral edge 22c of the stator 22. When viewed from the axial direction, most of the teeth 24 are not exposed, and only a portion of the teeth 24 can be seen in the area where the signal line 37 is provided. In this way, compared with the first and second embodiments of the present disclosure, the motor 50 of the prior art is used to make the gap portion for the cooling air to flow into the stator 22 smaller, and the wind tunnel resistance is larger.

[0073] The motors 20 and 40 for the electric working machine of the present embodiment described above can be appropriately changed. The motors 20 and 40 provided in a chain saw are exemplified. Instead of this, the motors 20 and 40 can be applied to various electric working machines such as screw tightening machines, electric drills, circular saws, grinders, cleaners, and blowers. The number of teeth 24 and the number of magnets 28c provided in the rotor 28 are not limited to the exemplified numbers, and can be appropriately changed.

[0074] The structure in which three sensors 35 for detecting the rotation of the rotor 28 are provided is illustrated. Instead of this, for example, a structure in which one sensor 35 is provided is also possible. The structure in which one sensor 35 is provided in each leg 32, 43 is illustrated. Instead of this, for example, a plurality of sensors 35 may be provided in one leg 32, 43. The structure of this embodiment is preferable in that the total opening area of ​​the slits 38, 47 can be enlarged.

[0075] The substrate bodies 31 and 42 are shown as annular. Instead of this, they may be, for example, in the shape of a capital letter C extending in the circumferential direction of the motor shaft 27. The substrate bodies 31 and 42 are shown as having circular outer peripheral edges 31a and 42a. Instead of this, for example, the outer peripheral edges 31a and 42a may be polygonal. The diodes 36 provided on the substrate bodies 31 and 42 are shown as an example. Instead of this, the diodes 36 may be provided on the legs 32 and 43.

[0076] The structure in which the slits 38 and 47 are provided on both sides of the leg parts 32 and 43 in the circumferential direction is illustrated. Instead of this, the structure in which the slits 38 and 47 are provided only on one side of the leg parts 32 and 43 in the circumferential direction may be used. The structure in which the leg parts 32 and 43 and the mounting legs 33 and 44 are different parts is illustrated. Instead of this, the leg parts and the mounting legs may be the same part. The number of mounting legs may be 3 or more as long as the sensor substrate can be stably supported. The number of mounting legs may be 5 or 3 as illustrated, or may be 4 or 6 or more.

[0077] The structure in which the centers of the inner peripheral ends 24a of all teeth 24 are exposed from the slits 38 when viewed from the axial direction is illustrated. Alternatively, the centers of the inner peripheral ends 24a of some teeth 24 may be exposed from the slits 38. The more exposed the teeth 24 are, the more the wind tunnel resistance can be suppressed.

[0078] The structure in which the inclined surface 46 is provided on the outer side surface 41a of both the substrate body 42 and the leg portion 43 is illustrated. Instead of this, for example, the inclined surface 46 may be provided on the outer side surface 41a of either the substrate body 42 or the leg portion 43. For example, the inclined surface 46 may be provided on a part of the plurality of leg portions 43 and the outer side surface 41a of the substrate body 42.

[0079] The following structure is illustrated: the sensor substrate 41 is provided with an MID, and a frame extending substantially parallel to the inclined surface 46 is provided on the outer side surface 41a of the substrate body 42 and the leg 43. Instead of this, the sensor substrate 41 may be provided with a flat plate-shaped material similar to the sensor substrate 30, and an inclined surface may be formed on the outer side surface of the frame. This structure can be achieved, for example, by Figure 6 The outer side surface of the frame 34 shown is provided as an inclined surface.

[0080] The shapes of the patterns 39 and 48 provided on the sensor substrates 30 and 41 are not limited to the shapes illustrated, and can be changed as appropriate. For example, the patterns 39 and 48 may be provided only on the outer side surfaces 30a and 41a of the sensor substrates 30 and 41, or only on the inner side surfaces 30b and 41b. The patterns 39 and 48 are illustrated in which the number of the inner patterns 39a and 48a is greater than that of the outer patterns 39b and 48b. Alternatively, the number of the outer patterns 39b and 48b may be greater than that of the inner patterns 39a and 48a. Capacitors or the like electrically connected to the sensors 35 may also be provided on the sensor substrates 30 and 41.

Claims

1. A motor for an electric working machine, characterized in that: It has a stator, a rotor and a sensor substrate, wherein: The stator is cylindrical; The rotor is arranged on the inner circumference side of the stator; The sensor substrate is disposed at an axial end of the stator. The sensor substrate has a substrate body and a leg portion, wherein: The substrate body is located radially inward of the stator when viewed from the axial direction; The leg portion protrudes radially outward from the substrate body, The stator is exposed in at least one direction of the leg portion in the circumferential direction. The electric working machine motor includes a sensor that is provided on the leg portion and faces the rotor and detects rotation of the rotor.

2. The motor for an electric working machine according to claim 1, characterized in that: The stator includes a cylindrical outer cylinder portion and teeth protruding radially inward from the outer cylinder portion and having coils wound therearound. When viewed from the axial direction, inner peripheral ends of the teeth are exposed.

3. The motor for an electric working machine according to claim 1 or 2, characterized in that: The sensor substrate has mounting legs that protrude radially outward from the substrate body and are mounted on the stator.

4. The motor for an electric working machine according to claim 3, characterized in that: The stator includes a cylindrical outer cylinder portion and a plurality of teeth protruding radially inward from the outer cylinder portion and having coils wound therearound. The leg portion and the mounting leg are provided at positions away from centers of radial inner peripheral ends of the plurality of teeth when viewed from the axial direction.

5. The motor for an electric working machine according to claim 4, characterized in that: The sensor substrate has at least one leg portion and at least one mounting leg, When viewed from the axial direction, all of the leg portions and all of the mounting legs avoid the center of the inner peripheral ends of the plurality of teeth, so that the center of the inner peripheral ends of the plurality of teeth is entirely exposed.

6. A motor for an electric working machine, characterized in that: The invention comprises an outer cylinder portion of a cylindrical stator, a plurality of teeth, a rotor and a sensor substrate, wherein: The plurality of teeth protrude radially inward from the outer cylinder portion and are wound with coils; The rotor is arranged on the inner circumference side of the plurality of teeth; The sensor substrate is disposed at an axial end of the stator. The sensor substrate has a substrate body, the substrate body is annular, and when viewed from the axial direction, the substrate body is along the radial inner side of the inner peripheral ends of the plurality of teeth. The center of at least one inner peripheral end of the plurality of teeth is exposed radially outside the substrate body. The electric working machine motor includes a sensor that is provided on the sensor substrate and faces the rotor and detects rotation of the rotor.

7. The motor for an electric working machine according to claim 6, characterized in that: The sensor substrate has mounting legs that protrude radially outward from the substrate body and are mounted on the stator.

8. The motor for an electric working machine according to claim 6 or 7, characterized in that: The sensor substrate has a leg portion protruding radially outward from the substrate body, and the sensor is provided on the leg portion.

9. The motor for an electric working machine according to claim 6, characterized in that: The sensor substrate has at least one mounting leg and at least one leg portion, wherein At least one of the mounting legs protrudes radially outward from the base body and is mounted on the stator; At least one of the legs protrudes radially outward from the substrate body and is provided with the sensor, When viewed from the axial direction, all of the leg portions and all of the mounting legs avoid the center of the inner peripheral ends of the plurality of teeth, so that the centers of the inner peripheral ends of the plurality of teeth are entirely exposed.

10. The motor for an electric working machine according to any one of claims 1 to 5 or claim 8, characterized in that: There are three sensors, The sensor substrate has three legs, and the sensors are provided on the legs.

11. A motor for an electric working machine, characterized in that: It has a stator, a rotor and a sensor substrate, wherein: The stator is cylindrical; The rotor is arranged on the inner circumference side of the stator; The sensor substrate is disposed at an axial end of the stator. The sensor substrate comprises a substrate body, an outer side surface of the substrate body and an inclined surface, wherein: The substrate body is located radially inward of the inner peripheral edge of the stator when viewed from the axial direction; The outer side surface of the substrate body is located on the opposite side of the rotor; The inclined surface is inclined toward the axial inner side of the rotor as it moves radially outward on the outer side of the substrate body. When viewed from the axial direction, a gap is formed between the outer peripheral edge of the substrate body and the inner peripheral edge of the stator. The electric working machine motor includes a sensor that is provided on the sensor substrate and faces the rotor and detects rotation of the rotor.

12. The motor for an electric working machine according to claim 11, characterized in that: having a frame covering a surface of the substrate body, The inclined surface is formed by a shape of the outer surface of the substrate body or a shape of the frame.

13. The motor for an electric working machine according to claim 11 or 12, characterized in that: The sensor substrate has a mounting leg which protrudes radially outward from the substrate body and is mounted on the stator. The inclined surface is arranged away from the mounting leg.

14. The motor for an electric working machine according to any one of claims 11 to 13, characterized in that: The sensor substrate has a leg portion protruding radially outward from the substrate body, and the sensor is provided on the leg portion.

15. The motor for an electric working machine according to any one of claims 11 to 14, characterized in that: The inclined surface is inclined with respect to a radial direction over the entire surface extending from the inner peripheral edge to the outer peripheral edge of the substrate body.

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