Electric work machine

Abstract

To appropriately detect rotation of a rotor.SOLUTION: An electric work machine includes: a stator including a stator core, an insulator fixed to the stator core, and a coil attached to the insulator; a rotor rotatable about a rotation axis and including a rotor core and a magnet fixed to the rotor core; a stator base supporting the stator; a sensor board supported by the stator base and including a magnetic sensor that detects the magnet; and an output unit drivable by the rotor.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The technology disclosed in this specification relates to a power working machine.

Background Art

[0002] In the technical field related to power working machines, a power working machine as disclosed in Patent Document 1 is known.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] A motor has a stator including a coil and a rotor including a magnet. The position of the rotor in the rotational direction is detected by a magnetic sensor mounted on a sensor board. The magnetic sensor detects the position of the rotor in the rotational direction by detecting the magnetic flux of the magnet of the rotor. Based on the detection signal of the magnetic sensor, a drive current is supplied to the coil, thereby generating a rotating magnetic field in the stator and rotating the rotor. In order to rotate the rotor properly, a technology capable of properly detecting the position of the rotor in the rotational direction is desired. For example, if the relative position between the sensor board and the motor is inappropriate, the detection accuracy of the magnetic sensor may decrease.

[0005] The technology disclosed in this specification aims to properly detect the rotation of the rotor.

Means for Solving the Problems

[0006] This specification discloses an electric working machine. The electric working machine may include a stator having a stator core, an insulator fixed to the stator core, and a coil attached to the insulator, a rotor having a rotor core and a magnet fixed to the rotor core, the rotor rotating about a rotation axis, a stator base supporting the stator, a sensor substrate supported by the stator base and having a magnetic sensor for detecting the magnet, and an output unit driven by the rotor.

Advantages of the Invention

[0007] According to the technology disclosed in this specification, the rotation of the rotor is properly detected.

Brief Description of the Drawings

[0008]

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[0009] In one or more embodiments, the electric power tool may include a stator having a stator core, an insulator fixed to the stator core, and a coil attached to the insulator, a rotor having a rotor core and a magnet fixed to the rotor core and rotating about a rotation axis, a stator base supporting the stator, a sensor substrate supported by the stator base and having a magnetic sensor for detecting the magnet, and an output unit driven by the rotor.

[0010] In the above configuration, since the stator and the sensor substrate are each supported by the stator base, fluctuations in the relative position between the stator and the sensor substrate are suppressed. Since the relative position between the stator and the rotor is managed with high precision, fluctuations in the relative position between the stator and the sensor substrate are suppressed, so that the relative position between the sensor substrate and the rotor is properly managed. Therefore, the magnetic sensor of the sensor substrate can properly detect the rotation of the rotor.

[0011] In one or more embodiments, at least a part of the rotor may be disposed around the stator.

[0012] In the above configuration, the rotation of the rotor is properly detected in an outer rotor type motor.

[0013] In one or more embodiments, the sensor substrate may be in contact with the stator base.

[0014] In the above configuration, fluctuations in the relative position between the stator base and the sensor substrate are sufficiently suppressed.

[0015] In one or more embodiments, the electric working machine may include a substrate positioning mechanism that positions the stator base and the sensor substrate.

[0016] In the above configuration, the sensor substrate is properly positioned on the stator base by the substrate positioning mechanism.

[0017] In one or more embodiments, the substrate positioning mechanism may include pins inserted into a base pin hole provided in the stator base and a substrate pin hole provided in the sensor substrate, respectively.

[0018] In the above configuration, the sensor substrate is positioned on the stator base with a simple configuration.

[0019] In one or more embodiments, at least two pins may be provided.

[0020] In the above configuration, the sensor substrate is positioned on the stator base in the radial direction and the rotational direction, for example.

[0021] In one or more embodiments, the pins may be press-fitted into the base pin holes.

[0022] In the above configuration, the sensor substrate is positioned on the stator base with a simple configuration.

[0023] In one or more embodiments, the substrate positioning mechanism may include a first screw inserted into a first base screw hole provided in the stator base through a substrate screw opening provided in the sensor substrate.

[0024] In the above configuration, the sensor substrate is fixed to the stator base with a simple configuration.

[0025] In one or more embodiments, the electric working machine may include a motor positioning mechanism that positions the stator base and the stator.

[0026] In the above configuration, the stator is properly positioned on the stator base by the motor positioning mechanism.

[0027] In one or more embodiments, the stator base may have a pipe portion disposed inside the stator core. The outer surface of the pipe portion may include a base plane region, and the inner surface of the stator core may include a stator plane region that contacts the base plane region. The motor positioning mechanism may include the base plane region and the stator plane region.

[0028] In the above configuration, for example, the stator is properly positioned on the stator base in the rotational direction.

[0029] In one or more embodiments, the base plane region may be provided at at least two locations in the circumferential direction of the rotation axis.

[0030] In the above configuration, the stator is properly positioned on the stator base.

[0031] In one or more embodiments, the outer surface of the pipe portion may include a base curved surface region, and the inner surface of the stator core may include a stator curved surface region that contacts the base curved surface region. The motor positioning mechanism may include the base curved surface region and the stator curved surface region.

[0032] In the above configuration, for example, the stator is properly positioned on the stator base in the radial direction.

[0033] In one or more embodiments, the stator base may have a base support surface that contacts an end surface on one axial side of the stator core. The motor positioning mechanism may include the base support surface.

[0034] In the above configuration, for example, the stator is properly positioned on the stator base in the axial direction.

[0035] In one or more embodiments, the base support surface may be provided on the pipe portion.

[0036] In the above configuration, the stator is positioned on the stator base with a simple configuration.

[0037] In one or more embodiments, the motor positioning mechanism may include a second screw that is inserted into a second base screw hole provided in the stator base through a core screw opening provided in the stator core.

[0038] In the above configuration, the stator is fixed to the stator base with a simple configuration.

[0039] In one or more embodiments, a plurality of core screw openings and second base screw holes may be provided at intervals around the rotation axis.

[0040] In the above configuration, the stator is firmly fixed to the stator base by a plurality of second screws.

[0041] In one or more embodiments, six core screw openings and six second base screw holes are provided, and the resonance frequency of the stator may be adjusted by the number of the second screws inserted into the second base screw holes through the core screw openings.

[0042] In the above configuration, the stator is firmly fixed to the stator base by at least six second screws. Also, by adjusting the number of the second screws used for fixing the stator and the stator base, the resonance frequency of the stator is adjusted. By adjusting the resonance frequency of the stator, the noise (electromagnetic noise) generated by the motor is suppressed.

[0043] In one or more embodiments, the second base screw hole may be provided in a screw boss disposed around the pipe portion.

[0044] In the above configuration, the stator core and the pipe portion are firmly fixed.

[0045] In one or more embodiments, the electric working machine may include a rotor shaft fixed to the rotor. The pipe portion may support the rotor shaft via a bearing.

[0046] In the above configuration, an increase in the size of the electric working machine is suppressed.

[0047] In one or more embodiments, the magnet is fixed to the inner peripheral surface of the rotor core.

[0048] In the above configuration, an increase in the size of the motor is suppressed.

[0049] Hereinafter, embodiments according to the present disclosure will be described with reference to the drawings, but the present disclosure is not limited to the embodiments. The components of the embodiments described below can be combined as appropriate. Also, some components may not be used.

[0050] In the embodiments, the positional relationships of the respective parts are described using the terms "left", "right", "front", "rear", "upper", and "lower". These terms indicate relative positions or directions based on the center of the electric working machine.

[0051] The electric working machine has a motor. In the embodiments, the radial direction of the rotation axis AX of the motor is appropriately referred to as the radial direction. The direction parallel to the rotation axis AX of the motor is appropriately referred to as the axial direction. The direction of orbiting around the rotation axis AX of the motor is appropriately referred to as the circumferential direction or the rotation direction.

[0052] A position close to or a direction approaching the rotation axis AX of the motor in the radial direction is appropriately referred to as the inner radial side. A position far from or a direction separated from the rotation axis AX of the motor in the radial direction is appropriately referred to as the outer radial side.

[0053] The position or direction on one side in the axial direction is appropriately referred to as the one side in the axial direction. The position or direction on the other side in the axial direction is appropriately referred to as the other side in the axial direction. In the embodiment, the axial direction is the vertical direction. When the one side in the axial direction is regarded as the upper side, the other side in the axial direction is the lower side. When the one side in the axial direction is regarded as the lower side, the other side in the axial direction is the upper side.

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

[0055] [Power-operated working machine] FIG. 1 is a view showing a power-operated working machine 1 according to an embodiment. In the present embodiment, the power-operated working machine 1 is a lawn mower which is a kind of outdoor power equipment.

[0056] As shown in FIG. 1, the power-operated working machine 1 includes a housing 2, wheels 3, a motor 4, a cutting blade 5, a cutting box 6, a handle 7, and a battery mounting portion 8.

[0057] The housing 2 houses the motor 4 and the cutting blade 5. Each of the wheels 3, the motor 4, and the cutting blade 5 is supported by the housing 2.

[0058] The wheels 3 rotate in a state of being in contact with the ground. By the rotation of the wheels 3, the power-operated working machine 1 can move on the ground. Four wheels 3 are provided.

[0059] The motor 4 is a power source of the power-operated working machine 1. The motor 4 generates a rotational force for rotating the cutting blade 5. The motor 4 is disposed above the cutting blade 5.

[0060] The cutting blade 5 is connected to the motor 4. The cutting blade 5 is the output part of the electric working machine 1 driven by the motor 4. The cutting blade 5 rotates around the rotation axis AX of the motor 4 by the rotational force generated by the motor 4. The cutting blade 5 faces the ground. When the wheels 3 are in contact with the ground and the cutting blade 5 rotates, the grass growing on the ground is cut. The grass cut by the cutting blade 5 is stored in the cutting box 6.

[0061] The handle 7 is held by the hand of the user of the electric working machine 1. The user can move the electric working machine 1 while holding the handle 7 by hand.

[0062] The battery pack 9 is mounted on the battery mounting part 8. The battery pack 9 is the power source of the electric working machine 1. The battery pack 9 is detachable from the battery mounting part 8. The battery pack 9 includes a secondary battery. In the present embodiment, the battery pack 9 includes a rechargeable lithium-ion battery. The battery pack 9 can supply power to the electric working machine 1 when mounted on the battery mounting part 8. The motor 4 is driven based on the drive current supplied from the battery pack 9.

[0063] [Motor] FIG. 2 is a perspective view from below showing the motor 4 according to the embodiment. FIG. 3 is an exploded perspective view from below showing the motor 4 according to the embodiment. FIG. 4 is a perspective view from above showing the motor 4 according to the embodiment. FIG. 5 is an exploded perspective view from above showing the motor 4 according to the embodiment. FIG. 6 is a front view showing the motor 4 according to the embodiment. FIG. 7 is a longitudinal sectional view showing the motor 4 according to the embodiment. FIG. 7 corresponds to a sectional view taken along line A-A in FIG. 4. FIG. 8 is a longitudinal sectional view showing the motor 4 according to the embodiment. FIG. 8 corresponds to a sectional view taken along line B-B in FIG. 4. FIG. 9 is a cross-sectional view showing the motor 4 according to the embodiment. FIG. 9 corresponds to a sectional view taken along line C-C in FIG. 6. In the embodiment, the motor 4 is an outer rotor type brushless motor.

[0064] As shown in FIGS. 2, 3, 4, 5, 6, 7, 8, and 9, the motor 4 includes a rotor 10, a rotor shaft 20, a stator 30, a stator base 40, a sensor substrate 50, and a motor housing 60. The rotor 10 rotates with respect to the stator 30. At least a part of the rotor 10 is disposed around the stator 30. The rotor 10 is disposed on the outer peripheral side of the stator 30. The rotor shaft 20 is fixed to the rotor 10. The rotor 10 and the rotor shaft 20 rotate about the rotation axis AX. The stator base 40 supports the stator 30. The cutting blade 5 is connected to the rotor shaft 20. The cutting blade 5 is driven by the rotor 10. The sensor substrate 50 supports a magnetic sensor that detects the rotation of the rotor 10.

[0065] In the embodiment, the rotation axis AX of the motor 4 extends in the vertical direction. The axial direction and the vertical direction are parallel.

[0066] The rotor 10 has a rotor cup 11, a rotor core 12, and a magnet 13.

[0067] The rotor cup 11 is made of a metal mainly composed of aluminum. The rotor cup 11 has a plate portion 11A and a yoke portion 11B.

[0068] The plate portion 11A is substantially annular. The plate portion 11A is disposed around the rotation axis AX. The central axis of the plate portion 11A and the rotation axis AX coincide. An opening 11C is provided in the central portion of the plate portion 11A. At least a part of the rotor shaft 20 is disposed inside the opening 11C. In the embodiment, a bush 14 is disposed between the outer surface of the rotor shaft 20 and the inner surface of the opening 11C.

[0069] The yoke portion 11B is substantially cylindrical. The lower end portion of the yoke portion 11B is connected to the peripheral edge portion of the plate portion 11A. The plate portion 11A and the yoke portion 11B are integral. The yoke portion 11B is arranged to extend upward from the peripheral edge portion of the plate portion 11A. The yoke portion 11B is arranged to surround the stator 30. The yoke portion 11B is arranged around the rotation axis AX. The central axis of the yoke portion 11B coincides with the rotation axis AX.

[0070] The rotor core 12 includes a plurality of steel plates laminated in the axial direction. The rotor core 12 is substantially cylindrical. The rotor core 12 is supported by the rotor cup 11. At least a part of the rotor cup 11 is arranged around the rotor core 12. The rotor core 12 is arranged radially inward of the yoke portion 11B. The yoke portion 11B is arranged around the rotor core 12. The rotor core 12 is supported by the inner peripheral surface of the yoke portion 11B.

[0071] The magnet 13 is a permanent magnet. The magnet 13 is plate-shaped. The magnet 13 is a sintered plate magnet. The magnet 13 is fixed to the rotor core 12. The magnet 13 is arranged radially inward of the rotor core 12. The magnet 13 is fixed to the inner peripheral surface of the rotor core 12. In the embodiment, the magnet 13 is fixed to the inner peripheral surface of the rotor core 12 by an adhesive. A plurality of magnets 13 are provided at intervals in the circumferential direction. In the embodiment, 28 magnets 13 are provided at intervals in the circumferential direction. The plurality of magnets 13 are provided at equal intervals in the circumferential direction. The N-pole magnets 13 and the S-pole magnets 13 are arranged alternately in the circumferential direction.

[0072] The rotor shaft 20 extends in the axial direction. The rotor shaft 20 is fixed to the rotor 10. The lower part of the rotor is arranged inside the opening 11C of the plate portion 11A. The rotor shaft 20 is fixed to the plate portion 11A via the bush 14. The upper end portion of the rotor shaft 20 is arranged above the upper surface of the plate portion 11A. The lower end portion of the rotor shaft 20 is arranged below the lower surface of the plate portion 11A.

[0073] The central axis of the rotor shaft 20 and the rotation axis AX coincide. The rotor shaft 20 is fixed to the rotor 10 such that the central axis of the rotor shaft 20 and the central axis of the yoke portion 11B coincide.

[0074] The stator 30 has a stator core 31, an insulator 32, and a coil 33.

[0075] The stator core 31 includes a plurality of steel plates laminated in the axial direction. The stator core 31 has a yoke 31A and teeth 31B. The yoke 31A is cylindrical. The yoke 31A is disposed around the rotation axis AX. The central axis of the outer peripheral surface of the yoke 31A and the rotation axis AX coincide. The teeth 31B project radially outward from the outer peripheral surface of the yoke 31A. A plurality of teeth 31B are provided at intervals in the circumferential direction. In the embodiment, 24 teeth 31B are provided. Slots are formed between adjacent teeth 31B.

[0076] The insulator 32 is made of synthetic resin. The insulator 32 is fixed to the stator core 31. The insulator 32 covers at least a part of the surface of the stator core 31. The insulator 32 covers at least a part of the end surface of the yoke 31A facing the axial direction. The end surface of the yoke 31A includes an upper end surface facing upward and a lower end surface facing downward. Also, the insulator 32 covers at least a part of the outer surface of the yoke 31A facing the radially outer side. Also, the insulator 32 covers at least a part of the surface of the teeth 31B.

[0077] In the embodiment, the stator core 31 and the insulator 32 are integrally formed. The insulator 32 is fixed to the stator core 31 by insert molding. After synthetic resin heated and melted is injected into a mold accommodating the stator core 31, the synthetic resin solidifies to form the insulator 32 fixed to the stator core 31.

[0078] The coil 33 is mounted on the insulator 32. The coil 33 is wound around each of a plurality of teeth 31B via the insulator 32. The mounting surface of the tooth 31B around which the coil 33 is wound is covered by the insulator 32. The outer surface of the tooth 31B facing the radially outer side is not covered by the insulator 32. The stator core 31 and the coil 33 are insulated by the insulator 32. A plurality of coils 33 are provided. In the embodiment, 24 coils 33 are arranged in the circumferential direction.

[0079] The stator base 40 supports the stator core 31. The stator base 40 is fixed to the stator core 31. The stator base 40 is made of aluminum. The stator base 40 has a plate portion 41, a peripheral wall portion 42, and a pipe portion 43.

[0080] The plate portion 41 is substantially annular. The plate portion 41 is arranged around the rotation axis AX. The plate portion 41 is arranged above the stator 30.

[0081] The peripheral wall portion 42 is substantially cylindrical. The upper end portion of the peripheral wall portion 42 is connected to the peripheral edge portion of the plate portion 41. The plate portion 41 and the peripheral wall portion 42 are integral. The peripheral wall portion 42 is arranged to extend downward from the peripheral edge portion of the plate portion 41. The peripheral wall portion 42 is arranged to surround the yoke portion 11B of the rotor cup 11.

[0082] The pipe portion 43 is substantially cylindrical. The pipe portion 43 protrudes downward from the central portion of the lower surface of the plate portion 41. The pipe portion 43 is arranged around the rotation axis AX. The central axis of the pipe portion 43 coincides with the rotation axis AX.

[0083] At least a part of the pipe portion 43 is arranged inside the stator core 31. The central axis of the pipe portion 43 coincides with the central axis of the yoke 31A.

[0084] In an embodiment, the pipe portion 43 includes a small-diameter portion 43A and a large-diameter portion 43B disposed above the small-diameter portion 43A. Each of the small-diameter portion 43A and the large-diameter portion 43B is cylindrical. The outer diameter of the large-diameter portion 43B is larger than the outer diameter of the small-diameter portion 43A. The stator core 31 is disposed around the small-diameter portion 43A. The small-diameter portion 43A is disposed inside the stator core 31. The large-diameter portion 43B is disposed outside the stator core 31. The large-diameter portion 43B is disposed above the stator core 31. The stator core 31 is fixed to the pipe portion 43. The stator base 40 is fixed to the stator 30 such that the central axis of the pipe portion 43 coincides with the central axis of the yoke 31A.

[0085] The motor 4 has a motor positioning mechanism 70 that positions the stator base 40 and the stator 30. The motor positioning mechanism 70 positions the stator base 40 and the stator core 31.

[0086] In an embodiment, the outer surface of the small-diameter portion 43A of the pipe portion 43 includes a base plane region 71. The base plane region 71 is provided at at least two locations in the circumferential direction. In an embodiment, the base plane region 71 is provided one each on the front side and the rear side of the rotation axis AX. The two base plane regions 71 are substantially parallel. Further, the outer surface of the small-diameter portion 43A of the pipe portion 43 includes a base curved surface region 72. The base curved surface region 72 is provided one each on the left side and the right side of the rotation axis AX.

[0087] The inner surface of the yoke 31A of the stator core 31 includes a stator plane region 73 that contacts the base plane region 71 and a stator curved surface region 74 that contacts the base curved surface region 72.

[0088] The motor positioning mechanism 70 includes the base plane region 71 and the stator plane region 73 that contacts the base plane region 71. Further, the motor positioning mechanism 70 includes the base curved surface region 72 and the stator curved surface region 74 that contacts the base curved surface region 72.

[0089] By the contact between the base plane region 71 and the stator plane region 73, the stator base 40 and the stator core 31 are positioned in the circumferential direction and the radial direction, respectively. Further, by the contact between the base curved surface region 72 and the stator curved surface region 74, the stator base 40 and the stator core 31 are positioned in the circumferential direction and the radial direction, respectively.

[0090] The pipe portion 43 has a base support surface 43C provided at the boundary between the small-diameter portion 43A and the large-diameter portion 43B. The base support surface 43C faces downward. The base support surface 43C is disposed around the small-diameter portion 43A.

[0091] The base support surface 43C contacts the upper end surface of the stator core 31. The base support surface 43C contacts the upper end surface of the yoke 31A of the stator core 31.

[0092] The motor positioning mechanism 70 includes the base support surface 43C. When the base support surface 43C provided on the pipe portion 43 contacts the upper end surface of the yoke 31A, the stator base 40 and the stator core 31 are positioned in the axial direction.

[0093] In the embodiment, the stator core 31 and the stator base 40 are fixed by screws 75. A core screw opening 31C is provided in the yoke 31A of the stator core 31. The core screw opening 31C includes a through hole formed to penetrate the upper end surface and the lower end surface of the yoke 31A. A plurality of core screw openings 31C are provided at intervals around the rotation axis AX. A screw boss 44 is disposed around the pipe portion 43. The screw boss 44 is disposed around the large-diameter portion 43B. A base screw hole 44A is provided in the screw boss 44. A plurality of screw bosses 44 are provided at intervals around the large-diameter portion 43B. That is, a plurality of base screw holes 44A are provided at intervals around the rotation axis AX.

[0094] At least six core screw openings 31C and base screw holes 44A are provided respectively. In the embodiment, six core screw openings 31C and base screw holes 44A are provided at equal intervals around the rotation axis AX.

[0095] In an embodiment, the stator core 31 and the stator base 40 are fixed by six screws 75. The screw 75 is inserted into the core screw opening 31C from below the stator core 31. The tip of the screw 75 inserted into the core screw opening 31C is inserted into the base screw hole 44A of the screw boss 44. By coupling the thread of the screw 75 and the thread groove of the base screw hole 44A, the stator core 31 and the stator base 40 are fixed by the screw 75.

[0096] The motor positioning mechanism 70 includes a screw 75 inserted into a base screw hole 44A provided in the stator base 40 through a core screw opening 31C provided in the stator core 31. The stator base 40 and the stator core 31 are fixed by the screw 75.

[0097] The pipe portion 43 supports the rotor shaft 20 via the bearing 21. The bearing 21 is disposed inside the pipe portion 43. The upper portion of the rotor shaft 20 is disposed inside the pipe portion 43. The bearing 21 rotatably supports the upper portion of the rotor shaft 20. The rotor shaft 20 is supported by the pipe portion 43 via the bearing 21.

[0098] In an embodiment, the stator base 40 has an annular plate portion 45 disposed at the upper end portion of the pipe portion 43. The upper surface of the bearing 21 is disposed below the lower surface of the annular plate portion 45. A wave washer 22 is disposed between the upper surface of the bearing 21 and the lower surface of the annular plate portion 45. The outer peripheral surface of the bearing 21 is supported by the inner surface of the pipe portion 43. The upper surface of the bearing 21 is supported by the annular plate portion 45 via the wave washer 22.

[0099] The sensor substrate 50 is supported by the stator base 40. The sensor substrate 50 contacts the stator base 40. The sensor substrate 50 is fixed to the stator base 40. The sensor substrate 50 has a magnetic sensor 51 that detects the magnet 13 of the rotor 10. The magnetic sensor 51 detects the magnetic flux of the magnet 13. The magnetic sensor 51 detects the position of the rotation direction of the rotor 10 by detecting the change in the magnetic field accompanying the rotation of the rotor 10. The sensor substrate 50 is supported by the stator base 40 such that the magnet 13 and the magnetic sensor 51 face each other. The sensor substrate 50 is disposed radially outside the coil 33.

[0100] The motor housing 60 houses the rotor 10 and the stator 30. The motor housing 60 is connected to the stator base 40. The rotor 10 and the stator 30 are disposed in the internal space formed between the motor housing 60 and the stator base 40.

[0101] The motor housing 60 has a plate portion 61, a peripheral wall portion 62, and a flange portion 63.

[0102] The plate portion 61 is substantially annular. The plate portion 61 is disposed below the rotor cup 11. A pipe portion 64 is provided at the central portion of the plate portion 61. The lower portion of the rotor shaft 20 is disposed inside the pipe portion 64.

[0103] The motor housing 60 supports the bearing 23. The bearing 23 rotatably supports the lower portion of the rotor shaft 20. In the embodiment, the motor housing 60 has an annular plate portion 65 disposed at the lower end portion of the pipe portion 64. The lower surface of the bearing 23 is disposed above the upper surface of the annular plate portion 65. The outer peripheral surface of the bearing 23 is supported by the inner surface of the pipe portion 64. The lower surface of the bearing 23 is supported by the upper surface of the annular plate portion 65.

[0104] The peripheral wall portion 62 is substantially cylindrical. The lower end portion of the peripheral wall portion 62 is connected to the peripheral edge portion of the plate portion 61. The peripheral wall portion 62 protrudes upward from the peripheral edge portion of the plate portion 61. The peripheral wall portion 62 is arranged so as to surround at least a part of the rotor cup 11.

[0105] The flange portion 63 is connected to the upper end portion of the peripheral wall portion 62. The flange portion 63 is provided so as to extend radially outward from the upper end portion of the peripheral wall portion 62. A plurality of through holes 66 are provided in the flange portion 63. In the embodiment, four through holes 66 are provided at intervals in the circumferential direction. A plurality of screw bosses 46 are provided on the peripheral wall portion 42 of the stator base 40. Four screw bosses 46 are provided at intervals in the circumferential direction. A screw hole is provided in each of the four screw bosses 46. The stator base 40 and the motor housing 60 are fixed by four screws 67. The screws 67 are inserted into the through holes 66 from below the flange portion 63. The tip of the screw 67 inserted into the through hole 66 is inserted into the screw hole of the screw boss 46. The thread of the screw 67 and the thread groove of the screw hole of the screw boss 46 are engaged, whereby the stator base 40 and the motor housing 60 are fixed by the screws 67.

[0106] A plurality of openings 47 are provided in the peripheral wall portion 42 of the stator base 40. A buffer member 48 is disposed in one of the plurality of openings 47. Rubber is exemplified as the material forming the buffer member 48. At least a part of the power line 91 described later is supported by the buffer member 48 disposed in the opening 47. The buffer member 48 suppresses wear of the power line 91.

[0107] A ventilation passage 68 is provided in a part of the plate portion 61. The ventilation passage 68 includes a flow passage having a labyrinth structure. When a cooling fan is fixed to the lower end of the rotor shaft 20, the cooling fan rotates due to the rotation of the rotor shaft 20. When the cooling fan rotates, the cooling fan sucks the air in the internal space between the stator base 40 and the motor housing 60 through the ventilation passage 68. When air is sucked through the ventilation passage 68, the air around the motor 4 flows into the internal space through the opening 47. Thereby, the motor 4 is cooled.

[0108] At least a part of the rotor cup 11 is provided with a discharge port 15 for discharging foreign matter inside the rotor cup 11. Two discharge ports 15 are provided in the plate portion 11A. For example, even if water enters the inside of the rotor cup 11, the water inside the rotor cup 11 is discharged from the discharge port 15 to the outside of the rotor cup 11.

[0109] As shown in FIG. 2, the motor housing 60 has a screw boss 600 fixed to the deck 200 of the housing 2. A through hole 201 is provided in the deck 200. A screw hole 601 is provided in the screw boss 600. The deck 200 of the housing 2 and the motor housing 60 are fixed by a screw 202. The screw 202 is inserted into the through hole 201 from below the deck 200. The tip of the screw 202 inserted into the through hole 201 is inserted into the screw hole 601 of the screw boss 600. By coupling the thread of the screw 202 and the thread groove of the screw hole 601, the deck 200 of the housing 2 and the motor housing 60 are fixed by the screw 202.

[0110] Further, the motor housing 60 has a screw boss 602 that is fixed to the baffle 203. The baffle 203 changes the air flow inside the motor housing 60. The baffle 203 is arranged to face the lower surface of the motor housing 60. An opening 203A is formed in the central portion of the baffle 203. The rotor shaft 20 is inserted into the opening 203A. A through hole 204 is provided in the baffle 203. A screw hole 603 is provided in the screw boss 602. The baffle 203 and the motor housing 60 are fixed by a screw 205. The screw 205 is inserted into the through hole 204 from below the baffle 203. The tip of the screw 205 inserted into the through hole 204 is inserted into the screw hole 603 of the screw boss 602. By coupling the thread of the screw 205 and the thread groove of the screw hole 603, the baffle 203 and the motor housing 60 are fixed by the screw 205.

[0111] [Sensor substrate] FIG. 10 is a view of the stator base 40 and the sensor substrate 50 according to the embodiment as seen from below. FIG. 11 is an exploded perspective view from below showing the stator base 40 and the sensor substrate 50 according to the embodiment.

[0112] The sensor substrate 50 is substantially arc-shaped. The sensor substrate 50 includes a circuit board 52 and a resin film 53 that covers at least a part of the surface of the circuit board 52. The circuit board 52 includes a printed circuit board (PCB). The circuit board 52 has an upper surface and a lower surface. The magnetic sensor 51 is disposed on the lower surface of the circuit board 52.

[0113] In the embodiment, at least a part of the surface of the magnetic sensor 51 and the circuit board 52 is covered by the resin film 53. The resin film 53 covers at least a part of the upper surface of the circuit board 52. The resin film 53 covers at least a part of the lower surface of the circuit board 52. On the surface of the circuit board 52, not only the magnetic sensor 51 but also a plurality of electronic components are mounted. Examples of the electronic components mounted on the surface of the circuit board 52 include capacitors, resistors, or thermistors. The resin film 53 is arranged to cover the electronic components as well.

[0114] The sensor substrate 50 is supported by the stator base 40. The sensor substrate 50 is fixed to the stator base 40. The stator base 40 has a pedestal portion 49 disposed inside the peripheral wall portion 42. The pedestal portion 49 is provided so as to project downward from the plate portion 41.

[0115] A plurality of pedestal portions 49 are provided. In the embodiment, three pedestal portions 49 are provided. The pedestal portions 49 include a pedestal portion 49A, a pedestal portion 49B, and a pedestal portion 49C.

[0116] The sensor substrate 50 is supported by the pedestal portion 49. The sensor substrate 50 contacts the pedestal portion 49. The sensor substrate 50 is fixed to the pedestal portion 49 in a state of contacting the pedestal portion 49.

[0117] The pedestal portion 49 has a support surface 49S facing the upper surface of the sensor substrate 50. The support surface 49S faces downward. The sensor substrate 50 has a support area 54 supported by the pedestal portion 49. The support area 54 is defined on the surface of the circuit board 52. The resin film 53 is not provided in the support area 54. The sensor substrate 50 is fixed to the pedestal portion 49 in a state where the upper surface of the support area 54 and the support surface 49S of the pedestal portion 49 are in contact.

[0118] The support area 54 includes a support area 54A supported by the pedestal portion 49A, a support area 54B supported by the pedestal portion 49B, and a support area 54C supported by the pedestal portion 49C.

[0119] The motor 4 has a substrate positioning mechanism 80 for positioning the stator base 40 and the sensor substrate 50. The substrate positioning mechanism 80 includes a pin 81 and a screw 82.

[0120] A base pin hole 83 is provided in the pedestal portion 49 of the stator base 40. A substrate pin hole 84 is provided in the support area 54 of the sensor substrate 50. The pin 81 is inserted into each of the base pin hole 83 and the substrate pin hole 84.

[0121] At least two pins 81 are provided. In an embodiment, two pins 81 are provided at intervals in the circumferential direction.

[0122] Base pin holes 83 are provided one by one in each of pedestal portions 49A and 49B. Substrate pin holes 84 are provided one by one in each of support areas 54A and 54B.

[0123] The pin 81 is press-fitted into the base pin hole 83. By press-fitting the pin 81 into the base pin hole 83, the pin 81 is fixed to the pedestal portion 49. After the pin 81 is press-fitted into the base pin hole 83, the substrate pin hole 84 is inserted into the pin 81.

[0124] Base screw holes 85 are provided in the pedestal portion 49 of the stator base 40. Substrate screw openings 86 are provided in the support area 54 of the sensor substrate 50. The screw 82 is inserted into the base screw hole 85 provided in the stator base 40 through the substrate screw opening 86 provided in the sensor substrate 50. Thereby, the pedestal portion 49 and the sensor substrate 50 are fixed by the screw 82.

[0125] At least three screws 82 are provided. In an embodiment, three screws 82 are provided at intervals in the circumferential direction.

[0126] Base screw holes 85 are provided one by one in each of pedestal portions 49A, 49B, and 49C. Substrate screw openings 86 are provided one by one in each of support areas 54A, 54B, and 54C.

[0127] [Rotor] FIG. 12 is a view of the rotor 10 according to the embodiment as seen from above. FIG. 13 is a cross-sectional view showing the rotor 10 according to the embodiment. FIG. 14 is a perspective cross-sectional view showing the rotor 10 according to the embodiment. FIG. 15 is an enlarged perspective cross-sectional view of a part of the rotor 10 according to the embodiment. FIG. 16 is an enlarged longitudinal cross-sectional view of a part of the rotor 10 according to the embodiment.

[0128] The rotor 10 has a rotor cup 11, a rotor core 12 supported by the rotor cup 11, and a magnet 13 fixed to the rotor core 12.

[0129] The magnet 13 is disposed radially inward of the rotor core 12. The magnet 13 has an upper end face 13A facing upward, a lower end face 13B facing downward, an inner end face 13C facing radially inward, and an outer end face 13D facing radially outward.

[0130] The rotor core 12 has an upper end face 12A facing upward, a lower end face 12B facing downward, an inner peripheral surface 12C facing radially inward, and an outer peripheral surface 12D facing radially outward. The inner peripheral surface 12C of the rotor core 12 faces the outer end face 13D of the magnet 13.

[0131] The rotor cup 11 has a plate portion 11A and a yoke portion 11B. The yoke portion 11B has a large-diameter portion 16, a small-diameter portion 17, and a rib portion 18.

[0132] The large-diameter portion 16 is disposed above the small-diameter portion 17. Each of the large-diameter portion 16 and the small-diameter portion 17 is disposed around the rotation axis AX. The inner peripheral surfaces of the large-diameter portion 16 and the small-diameter portion 17 each face radially inward. The inner peripheral surface of the large-diameter portion 16 is disposed radially outward of the inner peripheral surface of the small-diameter portion 17.

[0133] A core support surface 11D is provided at the boundary between the large-diameter portion 16 and the small-diameter portion 17. The core support surface 11D is annular and surrounds the rotation axis AX. The core support surface 11D faces upward. The core support surface 11D supports the lower end face 12B of the rotor core 12.

[0134] Also, at least a part of the lower end face 13B of the magnet 13 is supported by the core support surface 11D.

[0135] The rib portion 18 is disposed below the core support surface 11D on one axial side, which is the lower side. The rib portion 18 is provided on the inner peripheral surface of the small-diameter portion 17. The rib portion 18 projects radially inward from the inner peripheral surface of the small-diameter portion 17.

[0136] The rib portion 18 has an upper end surface 18A which is an end surface on the other axial side, and an inner end surface 18C facing radially inward.

[0137] The upper end surface 18A of the rib portion 18 is a magnet support surface 11E that supports at least a part of the lower end surface 13B of the magnet 13. In the embodiment, the magnet support surface 11E supports a part of the lower end surface 13B of the magnet 13.

[0138] In the circumferential direction, the dimension of the rib portion 18 is smaller than the dimension of the magnet 13. In the circumferential direction, the rib portion 18 is disposed at the central portion of the magnet 13. That is, in the circumferential direction, the magnet support surface 11E supports the central portion of the lower end surface 13B of the magnet 13.

[0139] In the radial direction, the inner end surface 18C of the rib portion 18 is disposed outside the inner end surface 13C of the magnet 13. That is, in the radial direction, the inner end portion of the magnet support surface 11E is disposed outside the inner end portion of the lower end surface 13B of the magnet 13.

[0140] The number of rib portions 18 is equal to the number of magnets 13. In the embodiment, 28 magnets 13 are provided. Also, 28 rib portions 18 are provided.

[0141] The number of rib portions 18 is equal to the number of magnets 13. In the embodiment, 28 magnets 13 are provided. Also, 28 rib portions 18 are provided.

[0142] The upper end surface 13A of the magnet 13 protrudes upward from the upper end surface 12A of the rotor core 12.

[0143] The rotor core 12 has a ring portion 12E having an inner peripheral surface 12C, and an inner convex portion 12F protruding radially inward from the inner peripheral surface 12C of the ring portion 12E. The inner convex portions 12F are disposed between the magnets 13 adjacent to each other in the circumferential direction.

[0144] An outer convex portion 12G that contacts the inner peripheral surface of the yoke portion 11B of the rotor cup 11 is provided on the outer peripheral surface 12D of the ring portion 12E of the rotor core 12. A plurality of outer convex portions 12G are provided at intervals in the circumferential direction. A concave portion 11F in which the outer convex portion 12G is disposed is provided on the inner peripheral surface of the rotor cup 11. Three outer convex portions 12G are arranged in one concave portion 11F.

[0145] In a plurality (three) of the outer convex portions 12G disposed in the concave portion 11F, an adhesive is filled between the mutually adjacent outer convex portions 12G. By filling the adhesive, an adhesive layer 19 is disposed between the mutually adjacent outer convex portions 12G. The adhesive layer 19 fixes the rotor core 12 and the rotor cup 11.

[0146] [Insulator] FIG. 17 is a perspective view from above showing the stator 30 according to the embodiment. FIG. 18 is a perspective view from below showing the stator 30 according to the embodiment. FIG. 19 is an exploded perspective view from above showing the stator 30 according to the embodiment. FIG. 20 is a cross-sectional view showing a part of the stator 30 according to the embodiment. FIG. 20 corresponds to a cross-sectional view taken along line D-D of FIG. 18 and viewed in the arrow direction. FIG. 21 is a cross-sectional view showing a part of the stator 30 according to the embodiment. FIG. 21 corresponds to a cross-sectional view taken along line E-E of FIG. 18 and viewed in the arrow direction.

[0147] The insulator 32 has an upper end covering portion 32A, a lower end covering portion 32B, an outer peripheral covering portion 32C, and a teeth covering portion 32D.

[0148] The upper end covering portion 32A is disposed so as to cover the peripheral edge portion of the upper end surface of the yoke 31A. The lower end covering portion 32B is disposed so as to cover the peripheral edge portion of the lower end surface of the yoke 31A. The outer peripheral covering portion 32C is disposed so as to cover the outer peripheral surface of the yoke 31A facing the radially outer side. The teeth covering portion 32D is disposed so as to cover the mounting surface of the teeth 31B around which the coil 33 is wound.

[0149] Further, the insulator 32 has an upper peripheral wall portion 34, a lower peripheral wall portion 35, a rib portion 36, a convex portion 37, a holding portion 38, and an insertion portion 39.

[0150] The upper peripheral wall portion 34 is arranged so as to surround the rotation axis AX. The upper peripheral wall portion 34 is provided so as to protrude upward from the upper end covering portion 32A. The upper peripheral wall portion 34 is arranged radially inward of the coil 33.

[0151] The lower peripheral wall portion 35 is arranged so as to surround the rotation axis AX. The lower peripheral wall portion 35 is provided so as to protrude downward from the lower end covering portion 32B. The lower peripheral wall portion 35 is arranged radially inward of the coil 33.

[0152] The rib portion 36 is provided on the lower end covering portion 32B. The rib portion 36 is provided so as to protrude downward from the lower end covering portion 32B. A plurality of rib portions 36 are provided at intervals in the circumferential direction. The heights of the plurality of rib portions 36 are equal to each other. The number of rib portions 36 is smaller than the number of coils 33.

[0153] The convex portion 37 is provided on the lower end covering portion 32B. The height of the convex portion 37 is lower than the height of the rib portion 36. The number of convex portions 37 is smaller than the number of rib portions 36. The number of convex portions 37 is smaller than the number of coils 33.

[0154] The holding portion 38 is provided on the upper peripheral wall portion 34. The holding portion 38 includes a hook portion provided on the outer peripheral surface of the upper peripheral wall portion 34.

[0155] The insertion portion 39 is provided on the upper peripheral wall portion 34.

[0156] Further, the insulator 32 has a plurality of rib portions 32E protruding upward from the upper end covering portion 32A.

[0157] The plurality of coils 33 are formed by winding a single wire 90. The single wire 90 is sequentially wound around each of the plurality of teeth 31B via the tooth covering portion 32D. The first coil 33 and the second coil 33 wound next to the first coil 33 are connected by the wire 90.

[0158] The rib portion 36 supports the wire 90 that connects the plurality of coils 33. The wire 90 is hung on the rib portion 36. The wire 90 is hung on the rib portion 36 from the radially inner side of the rib portion 36. The rib portion 36 supports the wire 90 such that the wire 90 is inserted between the teeth 31B adjacent to each other from the lower end covering portion 32B. As described above, slots are formed between the teeth 31B adjacent to each other. The rib portion 36 supports the wire 90 such that the wire 90 is inserted into the slot from the lower end covering portion 32B. The rib portion 36 guides the wire 90 from the lower end covering portion 32B to the lower end of the slot.

[0159] A plurality of wires 90 are arranged in the lower end covering portion 32B. Also, some of the wires 90 are arranged so as to overlap each other. For example, the first wire 90 that connects the first coil 33 and the second coil 33 is arranged in the lower end covering portion 32B. Also, the second wire 90 that connects the third coil 33 and the fourth coil 33 is arranged in the lower end covering portion 32B. The second wire 90 is arranged so as to overlap at least a part of the first wire 90. The convex portion 37 suppresses the contact between the first wire 90 and the second wire 90 by supporting the second wire 90.

[0160] When the second wire 90 is arranged so as to cover a part of the first wire 90, the convex portion 37 supports the second wire 90. The convex portion 37 has a support surface 37A that supports the second wire 90. The support surface 37A includes the lower surface of the convex portion 37. The support surface 37A faces downward. At least a part of the second wire 90 is arranged on the support surface 37A of the convex portion 37.

[0161] A drive current is supplied to the coil 33. The drive current is supplied to the coil 33 via the power line 91 and the fusing terminal 92. The drive current supplied to the coil 33 flows through the power line 91 and the fusing terminal 92.

[0162] Each of the 24 coils 33 is assigned to one of the U (UV) phase, V (VW) phase, and W (WU) phase. The power line 91 includes a power line 91U through which a U-phase drive current flows, a power line 91V through which a V-phase drive current flows, and a power line 91W through which a W-phase drive current flows.

[0163] The holding portion 38 holds the power line 91. The holding portion 38 includes a hook portion on which the power line 91 is hung. In the embodiment, two holding portions 38 are provided. The power line 91V is hung on one holding portion 38. The power line 91W is hung on the other holding portion 38.

[0164] At least a part of the holding portion 38 is provided so as to protrude radially outward from the outer peripheral surface of the upper peripheral wall portion 34. At least a part of the power line 91 is arranged so as to surround the outer peripheral surface of the upper peripheral wall portion 34. At least a part of the power line 91 is arranged between the upper peripheral wall portion 34 and the holding portion 38. At least a part of the power line 91 is supported by the outer peripheral surface of the upper peripheral wall portion 34.

[0165] The fusing terminal 92 connects a plurality of wires 90 protruding from each of the plurality of coils 33. The fusing terminal 92 includes a fusing terminal 92U through which a U-phase drive current flows, a fusing terminal 92V through which a V-phase drive current flows, and a fusing terminal 92W through which a W-phase drive current flows.

[0166] The power line 91U is connected to the fusing terminal 92U. The power line 91V is connected to the fusing terminal 92V. The power line 91W is connected to the fusing terminal 92W.

[0167] The fusing terminal 92 is inserted into an insertion portion 39 provided on the upper peripheral wall portion 34. The insertion portion 39 includes an insertion portion 39U into which the fusing terminal 92U is inserted, an insertion portion 39V into which the fusing terminal 92V is inserted, and an insertion portion 39W into which the fusing terminal 92W is inserted.

[0168] FIG. 22 is a perspective view showing the housing terminal 92 and the insertion portion 39 according to the embodiment. FIG. 23 is a side view showing the housing terminal 92 according to the embodiment. FIG. 24 is a cross-sectional view showing the insertion portion 39 into which the housing terminal 92 according to the embodiment is inserted. As shown in FIG. 22, the housing terminal 92 is inserted into the insertion portion 39 in which a plurality of wires 90 are arranged. That is, after the wires 90 are arranged in the insertion portion 39, the housing terminal 92 is inserted into the insertion portion 39.

[0169] The housing terminal 92 includes a base plate portion 92A, a holding plate portion 92B that holds the wire 90 between the base plate portion 92A, a ring portion 92C that holds the power line 91, and a caulking portion 92D that connects the base plate portion 92A and the holding plate portion 92B. An opening 92E is formed between the lower end portion of the base plate portion 92A and the lower end portion of the holding plate portion 92B. Further, the housing terminal 92 has a lower anchor portion 92F and an upper anchor portion 92G provided on the base plate portion 92A. The lower anchor portion 92F is disposed below the upper anchor portion 92G. Two lower anchor portions 92F are provided. Two upper anchor portions 92G are provided. In FIG. 24, one lower anchor portion 92F is provided so as to protrude forward from the front portion of the base plate portion 92A, and the other lower anchor portion 92F is provided so as to protrude rearward from the rear portion of the base plate portion 92A. In FIG. 24, one upper anchor portion 92G is provided so as to protrude forward from the front portion of the base plate portion 92A, and the other upper anchor portion 92G is provided so as to protrude rearward from the rear portion of the base plate portion 92A.

[0170] The insertion part 39 has a pair of accommodation parts 39A that are adjacent to each other in the circumferential direction, and a pair of hook parts 39B that are arranged radially outside the accommodation parts 39A. The accommodation part 39A has a recess 39C into which the base plate part 92A is inserted. A wire 90 is arranged between the accommodation part 39A and the hook part 39B. As shown in FIG. 24, the inner surface of the recess 39C includes a pair of lower parts 39D arranged in the front-rear direction and a pair of upper parts 39E arranged in the front-rear direction. The distance between one lower part 39D and the other lower part 39D (the width of the recess 39C in the lower part 39D) is smaller than the distance between one upper part 39E and the other upper part 39E (the width of the recess 39C in the upper part 39E). When the base plate part 92A is inserted into the recess 39C, first, a pair of lower anchor parts 92F are arranged between the pair of upper parts 39E. As a result, the base plate part 92A stands up in the recess 39C. From this state, when the base plate part 92A is further pushed downward in the recess 39C, each of the lower anchor part 92F and the upper anchor part 92G bites into the inner surface of the recess 39C. Thereby, the housing terminal 92 is fixed to the upper peripheral wall part 34.

[0171] [Structure of the coil] Next, the structure of the coil 33 will be described. FIG. 25 is a view of the stator 30 according to the embodiment as seen from below. FIG. 26 is a diagram schematically showing the coil 33 according to the embodiment.

[0172] As described above, in the embodiment, 24 coils 33 are provided. In the following description, each of the 24 coils 33 will be described by assigning numbers C1 to C24. The coil C2 is arranged adjacent to one circumferential side of the coil C1. The coil C3 is arranged adjacent to one circumferential side of the coil C2. Similarly, the coils C4 to C24 are arranged adjacent to one circumferential side of each of the coils C3 to C23. The coil C1 is arranged adjacent to one circumferential side of the coil C24.

[0173] The 24 coils 33 are formed by winding a single wire 90. As shown in FIG. 26, the wire 90 is started to be wound from the start winding portion S. The wire 90 is sequentially wound around each of the plurality of teeth 31B so that a plurality of coils 33 are sequentially formed. After the 24 coils 33 are formed, the wire 90 ends at the end winding portion E.

[0174] In an embodiment, some of the coils 33 are formed by winding the wire 90 in the forward rotation direction (counterclockwise direction). Some of the coils 33 are formed by winding the wire 90 in the reverse rotation direction (clockwise direction). The arrows in FIG. 26 indicate the winding direction of the wire 90. Coils C1, C4, C5, C8, C9, C12, C13, C16, C17, C20, C21, C24 are formed by winding the wire 90 in the forward rotation direction. Coils C2, C3, C6, C7, C10, C11, C14, C15, C18, C19, C22, C23 are formed by winding the wire 90 in the reverse rotation direction.

[0175] Coils C1, C2, C7, C8, C13, C14, C19, C20 are assigned to the U (UV) phase. Coils C3, C4, C9, C10, C15, C16, C21, C22 are assigned to the V (VW) phase. Coils C5, C6, C11, C12, C17, C18, C23, C24 are assigned to the W (WU) phase.

[0176] In FIG. 26, among the coils 33 assigned to the UV phase, the coils 33 in which the winding direction of the wire 90 is the forward rotation direction are marked with the characters "UV", and the coils 33 in which the winding direction of the wire 90 is the reverse rotation direction are underlined with the characters "UV". Among the coils 33 assigned to the VW phase, the coils 33 in which the winding direction of the wire 90 is the forward rotation direction are marked with the characters "VW", and the coils 33 in which the winding direction of the wire 90 is the reverse rotation direction are underlined with the characters "VW". Among the coils 33 assigned to the WU phase, the coils 33 in which the winding direction of the wire 90 is the forward rotation direction are marked with the characters "WU", and the coils 33 in which the winding direction of the wire 90 is the reverse rotation direction are underlined with the characters "WU".

[0177] In an embodiment, coil C1 is first formed. After coil C1 is formed by winding wire 90 in the forward rotation direction, wire 90 is stretched to the anti-connection side below the tooth 31B (on the side of the lower end covering portion 32B). After wire 90 stretched to the anti-connection side is hung on rib portion 36, it is wound to form coil C2. After coil C2 is formed by winding wire 90 in the reverse rotation direction, wire 90 is stretched to the anti-connection side, hung on rib portion 36, and then wound to form coil C8. After coil C8 is formed by winding wire 90 in the forward rotation direction, wire 90 is stretched to the anti-connection side, hung on rib portion 36, and then wound to form coil C7. After coil C7 is formed by winding wire 90 in the reverse rotation direction, wire 90 is stretched to the connection side above the tooth 31B (on the side of the upper end covering portion 32A).

[0178] Wire 90 stretched to the connection side is wound to form coil C21. After coil C21 is formed by winding wire 90 in the forward rotation direction, wire 90 is stretched to the anti-connection side, hung on rib portion 36, and then wound to form coil C22. After coil C22 is formed by winding wire 90 in the reverse rotation direction, wire 90 is stretched to the anti-connection side, hung on rib portion 36, and then wound to form coil C4. After coil C4 is formed by winding wire 90 in the forward rotation direction, wire 90 is stretched to the anti-connection side, hung on rib portion 36, and then wound to form coil C3. After coil C3 is formed by winding wire 90 in the reverse rotation direction, wire 90 is stretched to the connection side.

[0179] The wire 90 stretched to the connection side is wound to form the coil C17. After the coil C17 is formed by winding the wire 90 in the forward rotation direction, the wire 90 is stretched to the anti-connection side, hung on the rib portion 36, and then wound to form the coil C18. After the coil C18 is formed by winding the wire 90 in the reverse rotation direction, the wire 90 is stretched to the anti-connection side, hung on the rib portion 36, and then wound to form the coil C24. After the coil C24 is formed by winding the wire 90 in the forward rotation direction, the wire 90 is stretched to the anti-connection side, hung on the rib portion 36, and then wound to form the coil C23. After the coil C23 is formed by winding the wire 90 in the reverse rotation direction, the wire 90 is stretched to the connection side.

[0180] The wire 90 stretched to the connection side is wound to form the coil C13. After the coil C13 is formed by winding the wire 90 in the forward rotation direction, the wire 90 is stretched to the anti-connection side, hung on the rib portion 36, and then wound to form the coil C14. After the coil C14 is formed by winding the wire 90 in the reverse rotation direction, the wire 90 is stretched to the anti-connection side, hung on the rib portion 36, and then wound to form the coil C20. After the coil C20 is formed by winding the wire 90 in the forward rotation direction, the wire 90 is stretched to the anti-connection side, hung on the rib portion 36, and then wound to form the coil C19. After the coil C19 is formed by winding the wire 90 in the reverse rotation direction, the wire 90 is stretched to the connection side.

[0181] The wire 90 stretched to the connection side is wound to form the coil C9. After the coil C9 is formed by winding the wire 90 in the forward rotation direction, the wire 90 is stretched to the anti-connection side, hung on the rib portion 36, and then wound to form the coil C10. After the coil C10 is formed by winding the wire 90 in the reverse rotation direction, the wire 90 is stretched to the anti-connection side, hung on the rib portion 36, and then wound to form the coil C16. After the coil C16 is formed by winding the wire 90 in the forward rotation direction, the wire 90 is stretched to the anti-connection side, hung on the rib portion 36, and then wound to form the coil C15. After the coil C15 is formed by winding the wire 90 in the reverse rotation direction, the wire 90 is stretched to the connection side.

[0182] The wire 90 stretched to the connection side is wound to form the coil C5. After the coil C5 is formed by winding the wire 90 in the forward rotation direction, the wire 90 is stretched to the anti-connection side, hung on the rib portion 36, and then wound to form the coil C6. After the coil C6 is formed by winding the wire 90 in the reverse rotation direction, the wire 90 is stretched to the anti-connection side, hung on the rib portion 36, and then wound to form the coil C12. After the coil C12 is formed by winding the wire 90 in the forward rotation direction, the wire 90 is stretched to the anti-connection side, hung on the rib portion 36, and then wound to form the coil C11. After the coil C11 is formed by winding the wire 90 in the reverse rotation direction, the wire 90 is stretched to the connection side.

[0183] Thus, 24 coils 33 are formed.

[0184] Each of the wire 90 between the starting winding portion S disposed on the connection side and the coil C1 and the wire 90 between the coil C11 and the ending winding portion E is connected to the Hugging terminal 92U.

[0185] Each of the wire 90 between the coil C7 and the coil C21 arranged on the connection side and the wire 90 between the coil C19 and the coil C9 is connected to the fusing terminal 92V.

[0186] Each of the wire 90 between the coil C23 and the coil C13 arranged on the connection side and the wire 90 between the coil C15 and the coil C5 is connected to the fusing terminal 92W.

[0187] As shown in FIGS. 25 and 26, a plurality of wires 90 are arranged in the lower covering portion 32B on the anti-connection side. The wires 90 arranged on the anti-connection side include a wire 901 connecting the coil C2 and the coil C8, a wire 902 connecting the coil C6 and the coil C12, a wire 903 connecting the coil C9 and the coil C10, a wire 904 connecting the coil C10 and the coil C16, a wire 905 connecting the coil C14 and the coil C20, a wire 906 connecting the coil C18 and the coil C24, and a wire 907 connecting the coil C22 and the coil C4.

[0188] Also, in the lower covering portion 32B on the anti-connection side, some of the wires 90 are arranged to overlap each other. The convex portion 37 suppresses the contact of a pair of overlapping wires 90. In the embodiment, the convex portion 37 includes a convex portion 371, a convex portion 372, a convex portion 373, a convex portion 374, a convex portion 375, a convex portion 376, and a convex portion 377.

[0189] As shown in FIGS. 25 and 26, the wire 902 is arranged to overlap at least a part of the wire 901. When the wire 902 is arranged to cover a part of the wire 901, the convex portion 371 supports the wire 902. By supporting the wire 902, the convex portion 371 suppresses the contact between the wire 901 and the wire 902. The wire 902 is arranged to be lifted from the wire 901 by the convex portion 371. Thereby, the contact between the wire 901 and the wire 902 is suppressed.

[0190] Also, wire 902 is arranged to overlap at least a part of wire 903. When wire 902 is arranged to cover a part of wire 903, convex portion 372 supports wire 902. By supporting wire 902, convex portion 372 suppresses contact between wire 903 and wire 902. Wire 902 is arranged to be lifted from wire 903 by convex portion 372. Thereby, contact between wire 903 and wire 902 is suppressed.

[0191] Also, wire 902 is arranged to overlap at least a part of wire 904. When wire 902 is arranged to cover a part of wire 904, convex portion 373 supports wire 902. By supporting wire 902, convex portion 373 suppresses contact between wire 904 and wire 902. Wire 902 is arranged to be lifted from wire 904 by convex portion 373. Thereby, contact between wire 904 and wire 902 is suppressed.

[0192] Also, wire 904 is arranged to overlap at least a part of wire 905. When wire 904 is arranged to cover a part of wire 905, convex portion 374 supports wire 904. By supporting wire 904, convex portion 374 suppresses contact between wire 905 and wire 904. Wire 904 is arranged to be lifted from wire 905 by convex portion 374. Thereby, contact between wire 905 and wire 904 is suppressed.

[0193] Also, wire 905 is arranged to overlap at least a part of wire 906. When wire 905 is arranged to cover a part of wire 906, convex portion 375 supports wire 905. By supporting wire 905, convex portion 375 suppresses contact between wire 906 and wire 905. Wire 905 is arranged to be lifted from wire 906 by convex portion 375. Thereby, contact between wire 906 and wire 905 is suppressed.

[0194] Also, wire 906 is arranged to overlap at least a part of wire 907. When wire 906 is arranged to cover wire 907, convex portion 376 supports wire 906. By supporting wire 906, convex portion 376 suppresses contact between wire 907 and wire 906. Wire 906 is arranged to be lifted from wire 907 by convex portion 376. Thereby, contact between wire 907 and wire 906 is suppressed.

[0195] Also, wire 907 is arranged to overlap at least a part of wire 901. When wire 907 is arranged to cover wire 901, convex portion 377 supports wire 907. By supporting wire 907, convex portion 377 suppresses contact between wire 901 and wire 907. Wire 907 is arranged to be lifted from wire 901 by convex portion 377. Thereby, contact between wire 901 and wire 907 is suppressed.

[0196] [Controller] FIG. 27 is a schematic diagram showing the electric working machine 1 according to the embodiment. As shown in FIG. 27, a plurality of coils 33 are delta-connected. Coils C1, C2, C8, C7, C13, C14, C20, C19 are assigned to the U (UV) phase. Coils C9, C10, C16, C15, C21, C22, C4, C3 are assigned to the V (VW) phase. Coils C5, C6, C12, C11, C17, C18, C24, C23 are assigned to the W (WU) phase.

[0197] Coils C1, C2, C8, C7 are connected in series, and coils C13, C14, C20, C19 are connected in series. Also, coils C1, C2, C8, C7 and coils C13, C14, C20, C19 are connected in parallel.

[0198] Coils C9, C10, C16, C15 are connected in series, and coils C21, C22, C4, C3 are connected in series. Also, coils C9, C10, C16, C15 and coils C21, C22, C4, C3 are connected in parallel.

[0199] Coils C5, C6, C12, and C11 are connected in series, and coils C17, C18, C24, and C23 are connected in series. Also, coils C5, C6, C12, C11 and coils C17, C18, C24, C23 are connected in parallel.

[0200] That is, in the embodiment, the 24 coils 33 are delta-connected in two parallel and four series.

[0201] Three magnetic sensors 51 are provided. The magnetic sensors 51 include a magnetic sensor 51U corresponding to the U (UV) phase, a magnetic sensor 51V corresponding to the V (VW) phase, and a magnetic sensor 51W corresponding to the W (WU) phase.

[0202] The electric working machine 1 includes a controller 100, a gate circuit 101, an inverter 102, and a current detection circuit 103.

[0203] The controller 100 includes a circuit board on which a plurality of electronic components are mounted. Examples of the electronic components mounted on the circuit board include a processor such as a CPU (Central Processing Unit), a non-volatile memory such as a ROM (Read Only Memory) or a storage, and a volatile memory such as a RAM (Random Access Memory).

[0204] The inverter 102 supplies a drive current to the coil 33 based on the power supplied from the battery pack 9. The inverter 102 has six switching elements QHu, QHv, QHw, QLu, QLv, QLw. Each of the switching elements QHu, QHv, QHw, QLu, QLv, QLw includes a field effect transistor (FET).

[0205] The switching element QHu is arranged between the fusing terminal 92U and the power line connected to the positive electrode of the battery pack 9. The switching element QHv is arranged between the fusing terminal 92V and the power line connected to the positive electrode of the battery pack 9. The switching element QHw is arranged between the fusing terminal 92W and the power line connected to the positive electrode of the battery pack 9. When the switching element QHu is turned on, the fusing terminal 92U and the power line are electrically connected. When the switching element QHv is turned on, the fusing terminal 92V and the power line are electrically connected. When the switching element QHw is turned on, the fusing terminal 92W and the power line are electrically connected.

[0206] The switching element QLu is arranged between the fusing terminal 92U and the ground line connected to the negative electrode of the battery pack 9. The switching element QLv is arranged between the fusing terminal 92V and the ground line connected to the negative electrode of the battery pack 9. The switching element QLw is arranged between the fusing terminal 92W and the ground line connected to the negative electrode of the battery pack 9. When the switching element QLu is turned on, the fusing terminal 92U and the ground line are electrically connected. When the switching element QLv is turned on, the fusing terminal 92V and the ground line are electrically connected. When the switching element QLw is turned on, the fusing terminal 92W and the ground line are electrically connected.

[0207] The gate circuit 101 is a drive circuit that drives the switching elements QHu, QHv, QHw, QLu, QLv, and QLw. The controller 100 outputs a control signal to the gate circuit 101 to drive the switching elements QHu, QHv, QHw, QLu, QLv, and QLw of the inverter 102.

[0208] The current detection circuit 103 is arranged in the energization path from the inverter 102 to the negative electrode of the battery pack 9. The current detection circuit 103 outputs a voltage signal corresponding to the current flowing through the energization path. The controller 100 can detect the drive current flowing through the coil 33 based on the output signal of the current detection circuit 103.

[0209] FIG. 28 is a diagram showing drive patterns of switching elements QHu, QHv, QHw, QLu, QLv, and QLw according to an embodiment. As shown in FIG. 28, the switching elements QHu, QHv, QHw, QLu, QLv, and QLw are driven by six drive patterns Dp1, Dp2, Dp3, Dp4, Dp5, and Dp6.

[0210] In drive pattern Dp1, since the switching elements QHv and QLu are turned on, drive current flows from fusing terminal 92V toward fusing terminal 92U through each of the plurality of coils 33 assigned to the UV phase.

[0211] In drive pattern Dp2, since the switching elements QHw and QLu are turned on, drive current flows from fusing terminal 92W toward fusing terminal 92U through each of the plurality of coils 33 assigned to the WU phase.

[0212] In drive pattern Dp3, since the switching elements QHw and QLv are turned on, drive current flows from fusing terminal 92W toward fusing terminal 92V through each of the plurality of coils 33 assigned to the VW phase.

[0213] In drive pattern Dp4, since the switching elements QHu and QLv are turned on, drive current flows from fusing terminal 92U toward fusing terminal 92V through each of the plurality of coils 33 assigned to the UV phase.

[0214] In drive pattern Dp5, since the switching elements QHu and QLw are turned on, drive current flows from fusing terminal 92U toward fusing terminal 92W through each of the plurality of coils 33 assigned to the WU phase.

[0215] In drive pattern Dp6, since the switching elements QHv and QLw are turned on, a drive current flows from the fusing terminal 92V toward the fusing terminal 92W through each of the plurality of coils 33 assigned to the VW phase.

[0216] By sequentially repeating the six drive patterns Dp1, Dp2, Dp3, Dp4, Dp5, and Dp6, a rotating magnetic field is generated in the motor 4, and the rotor 10 rotates.

[0217] [Motor assembly method] FIG. 29 is a diagram showing a method of assembling the motor 4 according to the embodiment. As shown in FIG. 29, the stator 30 and the stator base 40 are fixed by screws 75. Also, the rotor 10 and the rotor shaft 20 are fixed.

[0218] The stator 30 and the stator base 40 are fixed by six screws 75. Note that the number of screws 75 used to fix the stator 30 and the stator base 40 may be five or less. By adjusting the number of screws 75 used to fix the stator 30 and the stator base 40, the resonance frequency of the stator 30 is adjusted. By adjusting the resonance frequency of the stator 30, noise (electromagnetic noise) generated by the motor 4 is suppressed.

[0219] After the stator 30 and the stator base 40 are fixed and the rotor 10 and the rotor shaft 20 are fixed, the upper part of the rotor shaft 20 is inserted inside the pipe portion 43. The rotor shaft 20 is inserted into the pipe portion 43 from below the stator 30. A bearing 21 is mounted on the upper end portion of the rotor shaft 20. The rotor shaft 20 is inserted into the pipe portion 43 while the bearing 21 is guided by the pipe portion 43.

[0220] In the vertical direction, with the position of the upper end of the rotor shaft 20 and the position of the lower end of the pipe portion 43 being aligned, the magnet 13 is disposed below the stator core 31. That is, before the rotor shaft 20 is inserted into the pipe portion 43, the magnet 13 and the stator core 31 do not face each other. After at least a part of the rotor shaft 20 is inserted into the pipe portion 43, at least a part of the magnet 13 and the stator core 31 face each other. If the magnet 13 and the stator core 31 face each other before the rotor shaft 20 is inserted into the pipe portion 43, the magnet 13 and the stator core 31 may be attracted to each other by magnetic force, and the operation of inserting the rotor shaft 20 into the pipe portion 43 may not be smoothly carried out. In the embodiment, before the rotor shaft 20 is inserted into the pipe portion 43, the relative positions of the pipe portion 43, the stator core 31, the rotor shaft 20, and the magnet 13 are determined so that the magnet 13 and the stator core 31 do not face each other. After at least a part of the rotor shaft 20 is inserted into the pipe portion 43, at least a part of the magnet 13 and the stator core 31 face each other, so that the attraction between the magnet 13 and the stator core 31 is suppressed. Therefore, the operation of inserting the rotor shaft 20 into the pipe portion 43 is smoothly carried out.

[0221] [Effect] As described above, in the embodiment, the electric working machine 1 includes a stator 30 having a stator core 31, an insulator 32 fixed to the stator core 31, and a coil 33 attached to the insulator 32, a rotor 10 having a rotor core 12 and a magnet 13 fixed to the rotor core 12 and rotating about the rotation axis AX, a stator base 40 supporting the stator 30, a sensor board 50 supported by the stator base 40 and having a magnetic sensor 51 for detecting the magnet 13, and a cutting blade 5 which is an output unit driven by the rotor 10.

[0222] In the above configuration, since the stator 30 and the sensor substrate 50 are each supported by the stator base 40, fluctuations in the relative positions of the stator 30 and the sensor substrate 50 are suppressed. Since the relative position between the stator 30 and the rotor 10 is managed with high precision, by suppressing fluctuations in the relative position between the stator 30 and the sensor substrate 50, the relative position between the sensor substrate 50 and the rotor 10 is properly managed. Therefore, the magnetic sensor 51 of the sensor substrate 50 can properly detect the rotation of the rotor 10.

[0223] In the embodiment, at least a part of the rotor 10 is disposed around the stator 30.

[0224] In the above configuration, the rotation of the rotor 10 is properly detected in the outer rotor type motor 4.

[0225] In the embodiment, the sensor substrate 50 contacts the stator base 40.

[0226] In the above configuration, fluctuations in the relative position between the stator base 40 and the sensor substrate 50 are sufficiently suppressed.

[0227] In the embodiment, the electric working machine 1 includes a substrate positioning mechanism 80 that positions the stator base 40 and the sensor substrate 50.

[0228] In the above configuration, the sensor substrate 50 is properly positioned on the stator base 40 by the substrate positioning mechanism 80.

[0229] In the embodiment, the substrate positioning mechanism 80 includes pins 81 that are inserted into a base pin hole 83 provided in the stator base 40 and a substrate pin hole 84 provided in the sensor substrate 50, respectively.

[0230] In the above configuration, the sensor substrate 50 is positioned on the stator base 40 with a simple configuration.

[0231] In the embodiment, at least two pins 81 are provided.

[0232] In the above configuration, for example, the sensor substrate 50 is positioned on the stator base 40 in each of the radial direction and the rotational direction.

[0233] In the embodiment, the pin 81 is press-fitted into the base pin hole 83.

[0234] In the above configuration, the sensor substrate 50 is positioned on the stator base 40 with a simple configuration.

[0235] In the embodiment, the substrate positioning mechanism 80 includes a screw 82 which is a first screw inserted into a base screw hole 85 which is a first base screw hole provided in the stator base 40 through a substrate screw opening 86 provided in the sensor substrate 50.

[0236] In the above configuration, the sensor substrate 50 is fixed to the stator base 40 with a simple configuration.

[0237] In the embodiment, the electric working machine 1 includes a motor positioning mechanism 70 for positioning the stator base 40 and the stator 30.

[0238] In the above configuration, the stator 30 is properly positioned on the stator base 40 by the motor positioning mechanism 70.

[0239] In the embodiment, the stator base 40 has a pipe portion 43 disposed inside the stator core 31. The outer surface of the pipe portion 43 includes a base plane region 71, and the inner surface of the stator core 31 includes a stator plane region 73 that contacts the base plane region 71. The motor positioning mechanism 70 includes the base plane region 71 and the stator plane region 73.

[0240] In the above configuration, for example, the stator 30 is properly positioned on the stator base 40 in the rotational direction.

[0241] In the embodiment, the base plane region 71 is provided at at least two locations in the circumferential direction of the rotation axis AX.

[0242] In the above configuration, the stator 30 is properly positioned on the stator base 40.

[0243] In an embodiment, the outer surface of the pipe portion 43 includes a base curved surface region 72, and the inner surface of the stator core 31 includes a stator curved surface region 74 that contacts the base curved surface region 72. The motor positioning mechanism 70 includes the base curved surface region 72 and the stator curved surface region 74.

[0244] In the above configuration, for example, the stator 30 is properly positioned on the stator base 40 in the radial direction.

[0245] In an embodiment, the stator base 40 has a base support surface 43C that contacts the upper end surface, which is one end surface of the stator core 31 in the axial direction. The motor positioning mechanism 70 includes the base support surface 43C.

[0246] In the above configuration, for example, the stator 30 is properly positioned on the stator base 40 in the axial direction.

[0247] In an embodiment, the base support surface 43C is provided on the pipe portion 43.

[0248] In the above configuration, the stator 30 is positioned on the stator base 40 with a simple configuration.

[0249] In an embodiment, the motor positioning mechanism 70 includes a screw 75, which is a second screw inserted into a base screw hole 44A, which is a second base screw hole provided in the stator base 40, through a core screw opening 31C provided in the stator core 31.

[0250] In the above configuration, the stator 30 is fixed to the stator base 40 with a simple configuration.

[0251] In an embodiment, a plurality of core screw openings 31C and base screw holes 44A are provided at intervals around the rotation axis AX.

[0252] In the above configuration, the stator 30 is firmly fixed to the stator base 40 by a plurality of screws 75.

[0253] In the embodiment, six core screw openings 31C and base screw holes 44A are provided respectively, and the resonance frequency of the stator 30 is adjusted by the number of screws 75 inserted into the base screw holes 44A through the core screw openings 31C.

[0254] In the above configuration, the stator 30 is firmly fixed to the stator base 40 by at least six screws 75. Further, by adjusting the number of screws 75 used for fixing the stator 30 and the stator base 40, the resonance frequency of the stator 30 is adjusted. By adjusting the resonance frequency of the stator 30, the noise (electromagnetic noise) generated by the motor 4 is suppressed.

[0255] In the embodiment, the base screw hole 44A is provided in a screw boss 44 disposed around the pipe portion 43.

[0256] In the above configuration, the stator core 31 and the pipe portion 43 are firmly fixed.

[0257] In the embodiment, the electric working machine 1 includes a rotor shaft 20 fixed to the rotor 10. The pipe portion 43 supports the rotor shaft 20 via a bearing 21.

[0258] In the above configuration, the enlargement of the electric working machine 1 is suppressed.

[0259] In the embodiment, the magnet 13 is fixed to the inner peripheral surface of the rotor core 12.

[0260] In the above configuration, the enlargement of the motor 4 is suppressed.

[0261] [Other Embodiments] FIG. 30 is a diagram schematically showing a part of the rotor 10 according to another embodiment. In the above-described embodiment, the magnet support surface 11E was configured to support the central portion of the lower end surface 13B of the magnet 13. As shown in FIG. 30, the magnet support surface 11E may support a part of the lower end surface 13B of the first magnet 13 and a part of the lower end surface 13B of the second magnet 13 adjacent to the first magnet 13. That is, in the circumferential direction, the rib portion 18 having the magnet support surface 11E may be disposed at the boundary portion between two adjacent magnets 13. As shown in FIG. 30, one magnet 13 is supported by two rib portions 18.

[0262] FIG. 31 is a view of the rotor 10 according to another embodiment as seen from above. FIG. 32 is a cross-sectional view showing the rotor 10 according to another embodiment. In the above-described embodiment, the rotor core 12 and the rotor cup 11 were fixed by the adhesive layer 19 disposed between the mutually adjacent outer convex portions 12G. As shown in FIGS. 31 and 32, the rotor core 12 and the rotor cup 11 may be fixed by an anaerobic adhesive layer 190. The anaerobic adhesive layer 190 is disposed at the boundary between the inner surface of the convex portion 11G of the rotor cup 11 and the outer surface of the rotor core 12. The convex portions 11G are provided between the mutually adjacent concave portions 11F in the circumferential direction. The anaerobic adhesive layer 190 is formed by applying the anaerobic adhesive to at least one of the inner surface of the convex portion 11G and the outer surface of the rotor core 12.

[0263] In the above-described embodiment, the heights of the plurality of rib portions 36 were made equal to each other. The heights of the plurality of rib portions 36 may be different from each other.

[0264] In the above-described embodiment, the electric working machine 1 was a lawn mower which is a kind of gardening tool. The gardening tool is not limited to a lawn mower. Examples of the gardening tool include a hedge trimmer, a chainsaw, a grass cutter, and a blower. Further, the electric working machine 1 may be an electric tool. Examples of the electric tool include a driver drill, a vibration driver drill, an angle drill, an impact driver, a grinder, a hammer, a hammer drill, a multi-tool, and a reciprocating saw.

[0265] In the above-described embodiment, a battery pack 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.

Explanation of Signs

[0266] 1... Electric working machine, 2... Housing, 3... Wheel, 4... Motor, 5... Cutting blade, 6... Cutting box, 7... Handle, 8... Battery mounting part, 9... Battery pack, 10... Rotor, 11... Rotor cup, 11A... Plate part, 11B... Yoke part, 11C... Opening, 11D... Core support surface, 11E... Magnet support surface, 11F... Recess, 11G... Protrusion, 12... Rotor core, 12A... Upper end face, 12B... Lower end face, 12C... Inner peripheral surface, 12D... Outer peripheral surface, 12E... Ring part, 12F... Inner convex part, 12G... Outer convex part, 13... Magnet, 13A... Upper end face, 13B... Lower end face, 13C... Inner end face, 13D... Outer end face, 14... Bush, 15... Discharge port, 16... Large diameter part, 17... Small diameter part, 18... Rib part, 18A... Upper end face, 18C... Inner end face, 19... Adhesive layer, 20... Rotor shaft, 21... Bearing, 22... Wave washer, 23... Bearing, 30... Stator, 31... Stator core, 31A... Yoke, 31B... Teeth, 31C... Core screw opening, 32... Insulator, 32A... Upper covering part, 32B... Lower covering part, 32C... Outer peripheral covering part, 32D... Teeth covering part, 32E... Rib part, 33... Coil, 34... Upper peripheral wall part, 35... Lower peripheral wall part, 36... Rib part, 37... Protrusion, 37A... Support surface, 38... Holding part, 39... Insertion part, 39A... Accommodation part, 39B... Hook part, 39C... Recess, 39D... Lower part, 39E... Upper part, 39U... Insertion part, 39V... Insertion part, 39W... Insertion part, 40... Stator base, 41... Plate part, 42... Peripheral wall part, 43... Pipe part, 43A... Small diameter part, 43B... Large diameter part, 43C... Base support surface, 44... Screw boss, 44A... Base screw hole, 45... Annular plate part, 46... Screw boss, 47... Opening, 48... Buffer member, 49... Base part, 49A... Base part, 49B... Base part, 49C... Base part, 49S... Support surface, 50... Sensor board, 51... Magnetic sensor, 51U... Magnetic sensor, 51V... Magnetic sensor, 51W... Magnetic sensor, 52... Circuit board, 53... Resin film, 54... Support area, 54A... Support area, 54B... Support area, 54C... Support area, 60... Motor housing, 61... Plate part, 62... Peripheral wall part, 63... Flange part, 64... Pipe part, 65... Annular plate part, 66... Through hole, 67... Screw, 68... Ventilation path, 70... Motor positioning mechanism, 71... Base plane area, 72... Base curved surface area, 73... Stator plane area, 74... Stator curved surface area, 75... Screw, 80... Board positioning mechanism81…Pin, 82…Screw, 83…Base pin hole, 84…Substrate pin hole, 85…Base screw hole, 86…Substrate screw opening, 90…Wire, 91…Power line, 91U…Power line, 91V…Power line, 91W…Power line, 92…Fusing terminal, 92A…Base plate portion, 92B…Holding plate portion, 92C…Ring portion, 92D…Caulking portion, 92E…Opening, 92F…Lower anchor portion, 92G…Upper anchor portion, 92U…Fusing terminal, 92V…Fusing terminal, 92W…Fusing terminal, 100…Controller, 101…Gate circuit, 102…Inverter, 103…Current detection circuit, 190…Anaerobic adhesive layer, 200…Deck, 201…Through hole, 202…Screw, 203…Baffle, 203A…Opening, 204…Through hole, 205…Screw, 371…Convex portion, 372…Convex portion, 373…Convex portion, 374…Convex portion, 375…Convex portion, 376…Convex portion, 377…Convex portion, 600…Screw boss, 601…Screw hole, 602…Screw boss, 603…Screw hole, 901…Wire, 902…Wire, 903…Wire, 904…Wire, 905…Wire, 906…Wire, 907…Wire, AX…Axis of rotation.,

Claims

1. A stator having a stator core, an insulator fixed to the stator core, and a coil attached to the insulator; A rotor having a rotor core and a magnet fixed to the rotor core, the rotor rotating about a rotation axis; A stator base for supporting the stator; A sensor substrate supported by the stator base and having a magnetic sensor for detecting the magnet; An output section driven by the rotor; and The stator base has a plate portion disposed around the rotation axis above the stator, a peripheral wall portion integral with the plate portion and having an upper end connected to a peripheral edge of the plate portion, and a plurality of pedestal portions integral with the plate portion and protruding downward from the plate portion inside the peripheral wall portion; The sensor substrate is fixed to the pedestal portion in a state of being in contact with the pedestal portion; An electric working machine.

2. At least a part of the rotor is disposed around the stator; The electric working machine according to Claim 1.

3. Comprising a substrate positioning mechanism for positioning the stator base and the sensor substrate; The electric working machine according to Claim 1 or Claim 2.

4. The substrate positioning mechanism includes pins inserted into a base pin hole provided in the stator base and a substrate pin hole provided in the sensor substrate respectively; The electric working machine according to Claim 3.

5. At least two pins are provided; The electric working machine according to Claim 4.

6. The pin is press-fitted into the base pin hole; The electric working machine according to Claim 4 or Claim 5.

7. The substrate positioning mechanism includes a first screw inserted into a first base screw hole provided in the stator base through a substrate screw opening provided in the sensor substrate; The electric working machine according to any one of Claims 3 to 6.

8. Comprising a motor positioning mechanism for positioning the stator base and the stator; The electric working machine according to any one of Claims 1 to 7.

9. The stator base has a pipe portion disposed inside the stator core; An outer surface of the pipe portion includes a base plane region; An inner surface of the stator core includes a stator plane region that contacts the base plane region; The motor positioning mechanism includes the base plane region and the stator plane region; The electric working machine according to Claim 8.

10. The base plane region is provided at least at two locations in the circumferential direction of the rotation axis. The electric working machine according to claim 9.

11. The outer surface of the pipe portion includes a base curved surface region. The inner surface of the stator core includes a stator curved surface region that contacts the base curved surface region. The motor positioning mechanism includes the base curved surface region and the stator curved surface region. The electric working machine according to claim 9 or claim 10.

12. The stator base has a base support surface that contacts an end surface on one axial side of the stator core. The motor positioning mechanism includes the base support surface. The electric working machine according to any one of claims 9 to 11.

13. The base support surface is provided on the pipe portion. The electric working machine according to claim 12.

14. The motor positioning mechanism includes a second screw that is inserted into a second base screw hole provided in the stator base through a core screw opening provided in the stator core. The electric working machine according to any one of claims 9 to 13.

15. A plurality of each of the core screw openings and the second base screw holes are provided at intervals around the rotation axis. The electric working machine according to claim 14.

16. Six of each of the core screw openings and the second base screw holes are provided. The resonance frequency of the stator is adjusted by the number of the second screws inserted into the second base screw holes through the core screw openings. The electric working machine according to claim 15.

17. The second base screw holes are provided in screw bosses arranged around the pipe portion. The electric working machine according to claim 15 or claim 16.

18. Comprising a rotor shaft fixed to the rotor. The pipe portion supports the rotor shaft via a bearing. The electric working machine according to any one of claims 10 to 17.

19. The magnet is fixed to the inner peripheral surface of the rotor core. The electric working machine according to any one of claims 1 to 18.

20. A stator having a stator core, an insulator fixed to the stator core, and a coil mounted on the insulator. A rotor core and a magnet fixed to the rotor core, and a rotor that rotates about a rotation axis. A stator base, which is a member made of aluminum, supports the stator and is provided with a screw hole. A sensor substrate having a magnetic sensor for detecting the magnet and provided with a screw opening. A screw that is inserted into the screw hole through the screw opening to fix the sensor substrate to the stator base, which is the one member. An output unit driven by the rotor. An electric working machine.

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