Electric work machine

Abstract

To appropriately fix magnets to a rotor core.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 cup, a rotor core supported by the rotor cup, and a magnet fixed to the rotor core; and an output unit drivable by the rotor. The rotor cup includes a core support surface supporting an end face on one side in an axial direction of the rotor core and a magnet support surface supporting at least a part of an end face on one side in an axial direction of the magnet.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The technology disclosed in this specification relates to an electric working machine.

Background Art

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

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The motor has a stator including a stator core and a coil, and a rotor including a rotor core and a magnet. If the magnet is not fixed to the target position of the rotor core, the performance of the motor may deteriorate.

[0005] The technology disclosed in this specification aims to properly fix the magnet to the rotor core.

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 cup, a rotor core supported by the rotor cup, and a magnet fixed to the rotor core, the rotor rotating about a rotation axis, and an output unit driven by the rotor. The rotor cup may have a core support surface that supports one end surface of the rotor core in the axial direction and a magnet support surface that supports at least a part of one end surface of the magnet in the axial direction.

Effects of the Invention

[0007] According to the technology disclosed in this specification, the magnets are properly fixed to the rotor core. [Brief explanation of the drawings]

[0008]

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DETAILED DESCRIPTION OF THE INVENTION

[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 cup, a rotor core supported by the rotor cup, and a magnet fixed to the rotor core, and that rotates about a rotation axis, and an output unit driven by the rotor. The rotor cup may have a core support surface that supports an end surface on one axial side of the rotor core and a magnet support surface that supports at least a part of an end surface on one axial side of the magnet.

[0010] In the above configuration, the rotor core is supported by the core support surface of the rotor cup, and the magnet is supported by the magnet support surface of the rotor cup, so that the rotor core and the magnet are properly positioned. As a result, the magnet is fixed at the target position of the rotor core. Since the magnet is properly fixed to the rotor core, a decrease in the performance of the motor is suppressed.

[0011] In one or more embodiments, the magnet may be fixed to the inner peripheral surface of the rotor core.

[0012] In the above configuration, an increase in the size of the motor is suppressed.

[0013] In one or more embodiments, the magnet may be fixed by an adhesive.

[0014] In the above configuration, the magnet is fixed to the rotor core with a simple configuration.

[0015] In one or more embodiments, a plurality of magnets may be provided at intervals in the circumferential direction.

[0016] In the above configuration, each of the plurality of magnets is fixed at the target position of the rotor core.

[0017] In one or more embodiments, the rotor core may have a ring portion having an inner circumferential surface facing the outer end surfaces of the magnets facing radially outward, and inner protrusions protruding radially inward from the inner circumferential surface. The inner protrusions may be disposed between adjacent magnets.

[0018] In the above configuration, fluctuations in the relative positions of the multiple magnets are suppressed.

[0019] In one or more embodiments, the magnet support surface may support a portion of the end face of the magnet.

[0020] In the above configuration, an increase in the weight of the rotor cup is suppressed.

[0021] In one or more embodiments, the magnet support surface may support a central portion of the end face of the magnet in the circumferential direction.

[0022] In the above configuration, the magnet is stably supported on the magnet support surface.

[0023] In one or more embodiments, the magnet support surface may support a portion of an end face of a first magnet and a portion of an end face of a second magnet adjacent to the first magnet.

[0024] In the above configuration, the magnet is stably supported by the pair of magnet support surfaces.

[0025] In one or more embodiments, the inner edge of the magnet support surface may be positioned radially outward from the inner edge of the magnet end surface.

[0026] The above configuration prevents an increase in the weight of the rotor cup, and also prevents the magnet support surface from affecting the magnetic field of the coil.

[0027] In one or more embodiments, the rotor cup may have a rib portion disposed on one axial side of the core support surface. The magnet support surface may include an end surface on the other axial side of the rib portion.

[0028] In the above configuration, the magnet is stably supported by the rib portion.

[0029] In one or more embodiments, in the circumferential direction, the dimension of the rib portion may be smaller than the dimension of the magnet.

[0030] In the above configuration, an increase in the weight of the rotor cup is suppressed. Also, the rib portion is suppressed from affecting the magnetic field of the coil.

[0031] In one or more embodiments, in the circumferential direction, the rib portion may be disposed at the central portion of the magnet.

[0032] In the above configuration, the magnet is stably supported by the rib portion.

[0033] In one or more embodiments, in the circumferential direction, the rib portion may be disposed at the boundary portion between two adjacent magnets.

[0034] In the above configuration, the magnet is stably supported by a pair of rib portions.

[0035] In one or more embodiments, in the radial direction, the inner end surface of the rib portion may be disposed outside the inner end surface of the magnet.

[0036] In the above configuration, an increase in the weight of the rotor cup is suppressed. Also, the rib portion is suppressed from affecting the magnetic field of the coil.

[0037] In one or more embodiments, the number of rib portions and the number of magnets may be equal.

[0038] In the above configuration, by one rib portion supporting one magnet, an increase in the weight of the rotor cup is suppressed. Also, the rib portion is suppressed from affecting the magnetic field of the coil.

[0039] In one or more embodiments, the rotor cup may be made of metal.

[0040] In the above configuration, the strength of the rotor cup is maintained.

[0041] In one or more embodiments, the end face on the other axial direction side of the magnet may protrude from the end face on the other axial direction side of the rotor core.

[0042] In the above configuration, the magnetic sensor can accurately detect the magnet.

[0043] In one or more embodiments, at least a part of the rotor cup may be disposed around the rotor core, and an outer convex portion that contacts the inner peripheral surface of the rotor cup may be provided on the outer peripheral surface of the rotor core. A plurality of outer convex portions may be provided at intervals in the circumferential direction.

[0044] In the above configuration, an increase in the weight of the rotor cup is suppressed.

[0045] In one or more embodiments, the electric working machine may include an adhesive layer that is disposed between adjacent outer convex portions and fixes the rotor core and the rotor cup.

[0046] In the above configuration, the rotor core and the rotor cup are stably fixed.

[0047] In one or more embodiments, at least a part of the rotor cup may be provided with a discharge port for discharging foreign matter inside the rotor cup.

[0048] In the above configuration, it is suppressed that foreign matter stays inside the rotor cup.

[0049] Hereinafter, embodiments of 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. In addition, some components may not be used.

[0050] In the embodiment, the positional relationship of each part is 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 operating machine.

[0051] The electric work machine has a motor. In the embodiments, the radial direction of the motor's rotation axis AX will be referred to as the "radial direction," the direction parallel to the motor's rotation axis AX will be referred to as the "axial direction," and the direction circumferentially around the motor's rotation axis AX will be referred to as the "circumferential direction" or the "rotational direction."

[0052] A position closer to or approaching the rotation axis AX of the motor in the radial direction is referred to as the radially inner side, and a position farther from or away from the rotation axis AX of the motor in the radial direction is referred to as the radially outer side.

[0053] A position or direction on one side in the axial direction will be referred to as "one axial side" as appropriate. A position or direction on the other side in the axial direction will be referred to as "the other axial side" as appropriate. In the embodiment, the axial direction is the up-down direction. If one axial side is considered to be the upper side, the other axial side is the lower side. If one axial side is considered to be the lower side, the other axial side is the upper side.

[0054] A position or direction on one side in the circumferential direction will be referred to as "one circumferential side" as appropriate, and a position or direction on the other side in the circumferential direction will be referred to as "the other circumferential side" as appropriate.

[0055] [Electric work equipment] 1 is a diagram showing an electric working machine 1 according to an embodiment. In this embodiment, the electric working machine 1 is a lawn mower, which is a type of gardening tool (outdoor power equipment).

[0056] As shown in FIG. 1, the electric work 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 accommodates the motor 4 and the cutting blade 5. The wheels 3, the motor 4, and the cutting blade 5 are each supported by the housing 2.

[0058] The wheels 3 rotate while in contact with the ground. The rotation of the wheels 3 enables the electric working machine 1 to move on the ground. Four wheels 3 are provided.

[0059] The motor 4 is a power source for the electric work machine 1. The motor 4 generates a rotational force that rotates 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 an output part of the electric work 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. With the wheels 3 in contact with the ground, the cutting blade 5 rotates to cut the grass growing on the ground. 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 a user of the electric working machine 1. The user can move the electric working machine 1 while holding the handle 7 in their hand.

[0062] A battery pack 9 is attached to the battery attachment section 8. The battery pack 9 is a power source for the electric work machine 1. The battery pack 9 is detachable from the battery attachment section 8. The battery pack 9 includes a secondary battery. In this embodiment, the battery pack 9 includes a rechargeable lithium-ion battery. When attached to the battery attachment section 8, the battery pack 9 can supply power to the electric work machine 1. The motor 4 is driven based on the drive current supplied from the battery pack 9.

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

[0064] As shown in Figures 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 board 50, and a motor housing 60. The rotor 10 rotates relative to the stator 30. At least a portion of the rotor 10 is disposed around the stator 30. The rotor 10 is disposed on the outer periphery of the stator 30. The rotor shaft 20 is fixed to the rotor 10. The rotor 10 and the rotor shaft 20 rotate about a 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 board 50 supports a magnetic sensor that detects rotation of the rotor 10.

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

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

[0067] The rotor cup 11 is made of a metal whose main component is aluminum, and includes a plate portion 11A and a yoke portion 11B.

[0068] The plate portion 11A is substantially annular. The plate portion 11A is arranged around the rotation axis AX. The central axis of the plate portion 11A and the rotation axis AX coincide with each other. An opening 11C is provided in the center of the plate portion 11A. At least a portion of the rotor shaft 20 is arranged inside the opening 11C. In the embodiment, a bushing 14 is arranged 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 of the yoke portion 11B is connected to the peripheral edge of the plate portion 11A. The plate portion 11A and the yoke portion 11B are integral with each other. The yoke portion 11B is arranged to extend upward from the peripheral edge 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 and the rotation axis AX coincide with each other.

[0070] The rotor core 12 includes a plurality of steel plates stacked in the axial direction. The rotor core 12 is substantially cylindrical. The rotor core 12 is supported by a rotor cup 11. At least a portion 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 on the inner circumferential 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 from the rotor core 12. The magnet 13 is fixed to the inner circumferential surface of the rotor core 12. In the embodiment, the magnet 13 is fixed to the inner circumferential surface of the rotor core 12 with 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 north-pole magnets 13 and the south-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 disposed 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 disposed above the upper surface of the plate portion 11A. The lower end portion of the rotor shaft 20 is disposed 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 includes 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 the mutually 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 face of the yoke 31A facing the axial direction. The end face of the yoke 31A includes an upper end face facing upward and a lower end face 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 molded. The insulator 32 is fixed to the stator core 31 by insert molding. After heated and molten synthetic resin is injected into a mold that accommodates the stator core 31, the synthetic resin solidifies, thereby forming the insulator 32 fixed to the stator core 31.

[0078] The coils 33 are attached to the insulators 32. The coils 33 are wound around each of the multiple teeth 31B via the insulators 32. The attachment surfaces of the teeth 31B around which the coils 33 are wound are covered by the insulators 32. The outer surfaces of the teeth 31B facing radially outward are not covered by the insulators 32. The stator core 31 and the coils 33 are insulated from each other by the insulators 32. A plurality of coils 33 are provided. In this embodiment, 24 coils 33 are arranged circumferentially.

[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 disposed around the rotation axis AX. The plate portion 41 is disposed above the stator 30.

[0081] The peripheral wall portion 42 is substantially cylindrical. The upper end 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 with each other. The peripheral wall portion 42 is disposed so as to extend downward from the peripheral edge portion of the plate portion 41. The peripheral wall portion 42 is disposed so as 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 center 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 and the rotation axis AX coincide with each other.

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

[0084] In the 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 the 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 the 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 a base planar region 71 and a stator planar region 73 in contact with the base planar region 71. The motor positioning mechanism 70 also includes a base curved region 72 and a stator curved region 74 in contact with the base curved region 72.

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

[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 a base support surface 43C. The base support surface 43C provided on the pipe portion 43 comes into contact with the upper end surface of the yoke 31A, thereby positioning the stator base 40 and the stator core 31 in the axial direction.

[0093] In an 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 so as 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 an 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 screws 75 are inserted into the core screw openings 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. The thread of the screw 75 and the screw groove of the base screw hole 44A are engaged, whereby the stator core 31 and the stator base 40 are fixed by the screws 75.

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

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

[0098] In the embodiment, the stator base 40 has an annular plate portion 45 arranged at the upper end of the pipe portion 43. The upper surface of the bearing 21 is arranged lower than the lower surface of the annular plate portion 45. A wave washer 22 is arranged 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 board 50 is supported by the stator base 40. The sensor board 50 is in contact with the stator base 40. The sensor board 50 is fixed to the stator base 40. The sensor board 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 rotor 10 in the rotational direction by detecting changes in the magnetic field that accompany the rotation of the rotor 10. The sensor board 50 is supported by the stator base 40 so that the magnet 13 and the magnetic sensor 51 face each other. The sensor board 50 is arranged radially outward of the coil 33.

[0100] The motor housing 60 accommodates 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 an 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 projects upward from the peripheral edge portion of the plate portion 61. The peripheral wall portion 62 is disposed 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 end portion of the screw 67 inserted into the through hole 66 is inserted into the screw hole of the screw boss 46. The stator base 40 and the motor housing 60 are fixed by the screw 67 by the engagement of the thread of the screw 67 and the thread groove of the screw hole of the screw boss 46.

[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. An example of a material for forming the buffer member 48 is rubber. At least a portion of a power line 91 (described later) is supported by the buffer member 48 disposed in the opening 47. The buffer member 48 suppresses wear on the power line 91.

[0107] An air passage 68 is provided in a part of the plate portion 61. The air passage 68 includes a flow path with a labyrinth structure. When a cooling fan is fixed to the lower end of the rotor shaft 20, the rotation of the rotor shaft 20 rotates the cooling fan. As the cooling fan rotates, it sucks air from the internal space between the stator base 40 and the motor housing 60 via the air passage 68. As air is sucked through the air passage 68, the air around the motor 4 flows into the internal space via the opening 47. This cools the motor 4.

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

[0109] As shown in FIG. 2 , the motor housing 60 has a screw boss 600 that is fixed to the deck 200 of the housing 2. A through hole 201 is formed in the deck 200. A screw hole 601 is formed in the screw boss 600. The deck 200 of the housing 2 and the motor housing 60 are fixed together with 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. The thread of the screw 202 and the thread groove of the screw hole 601 are engaged with each other, thereby fixing the deck 200 of the housing 2 and the motor housing 60 together with the screw 202.

[0110] The motor housing 60 also has a screw boss 602 fixed to the baffle 203. The baffle 203 changes the airflow inside the motor housing 60. The baffle 203 is arranged to face the underside of the motor housing 60. An opening 203A is formed in the center of the baffle 203. The rotor shaft 20 is inserted into the opening 203A. A through hole 204 is formed in the baffle 203. A threaded hole 603 is formed in the screw boss 602. The baffle 203 and the motor housing 60 are fixed together with 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 threaded hole 603 of the screw boss 602. The threads of the screw 205 and the thread grooves of the threaded hole 603 are engaged, thereby fixing the baffle 203 and the motor housing 60 together with the screw 205.

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

[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 portion 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 portion of the surfaces of the magnetic sensor 51 and the circuit board 52 are covered with a resin film 53. The resin film 53 covers at least a portion of the upper surface of the circuit board 52. The resin film 53 covers at least a portion of the lower surface of the circuit board 52. Not only the magnetic sensor 51 but also a plurality of electronic components are mounted on the surface of the circuit board 52. Examples of electronic components mounted on the surface of the circuit board 52 include a capacitor, a resistor, or a thermistor. The resin film 53 is arranged so as to cover the electronic components as well.

[0114] The sensor board 50 is supported by the stator base 40. The sensor board 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 protrude downward from the plate portion 41.

[0115] There are provided a plurality of pedestals 49. In the embodiment, there are provided three pedestals 49. The pedestals 49 include pedestals 49A, 49B, and 49C.

[0116] The sensor substrate 50 is supported by the pedestal portion 49. The sensor substrate 50 is in contact with the pedestal portion 49. The sensor substrate 50 is fixed to the pedestal portion 49 while in contact with the pedestal portion 49.

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

[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 board positioning mechanism 80 that positions the stator base 40 and the sensor board 50. The board 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 board pin hole 84 is provided in the support area 54 of the sensor board 50. The pin 81 is inserted into each of the base pin hole 83 and the board 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 includes 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] Magnet 13 is disposed radially inward of rotor core 12. Magnet 13 has upper end surface 13A facing upward, lower end surface 13B facing downward, inner end surface 13C facing radially inward, and outer end surface 13D facing radially outward.

[0130] Rotor core 12 has upper end surface 12A facing upward, lower end surface 12B facing downward, inner circumferential surface 12C facing radially inward, and outer circumferential surface 12D facing radially outward. Inner circumferential surface 12C of rotor core 12 faces outer end surfaces 13D of magnets 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 .

[0132] The large diameter portion 16 is disposed above the small diameter portion 17. The large diameter portion 16 and the small diameter portion 17 are disposed around the rotation axis AX. The inner peripheral surfaces of the large diameter portion 16 and the small diameter portion 17 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 surface 12B of the rotor core 12.

[0134] Furthermore, at least a portion of the lower end surface 13B of the magnet 13 is also supported by the core support surface 11D.

[0135] The rib portion 18 is disposed below the core support surface 11D on one axial side. The rib portion 18 is provided on the inner circumferential surface of the small diameter portion 17. The rib portion 18 protrudes radially inward from the inner circumferential 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 disposed 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 in 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 in 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 radially outward. 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 disposed 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 disposed radially inward of the coil 33.

[0151] The lower peripheral wall portion 35 is disposed 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 disposed 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 the rib portions 36 are provided at intervals in the circumferential direction. The heights of the plurality of rib portions 36 are equal to one another. The number of the rib portions 36 is less than the number of the coils 33.

[0153] The protrusions 37 are provided on the lower end covering portion 32B. The height of the protrusions 37 is lower than the height of the rib portions 36. The number of the protrusions 37 is smaller than the number of the rib portions 36. The number of the protrusions 37 is smaller than the number of the 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 circumferential surface of the upper peripheral wall portion 34.

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

[0156] The insulator 32 also has a plurality of rib portions 32E that protrude upward from the upper end covering portion 32A.

[0157] The multiple coils 33 are formed by winding a single wire 90. The single wire 90 is wound sequentially around each of the multiple 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 multiple 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 so that the wire 90 is inserted from the lower end covered portion 32B between the adjacent teeth 31B. As described above, a slot is formed between the adjacent teeth 31B. The rib portion 36 supports the wire 90 so that the wire 90 is inserted from the lower end covered portion 32B into the slot. The rib portion 36 guides the wire 90 from the lower end covered portion 32B to the lower end of the slot.

[0159] A plurality of wires 90 are arranged in the lower end covering portion 32B. Some of the wires 90 are arranged to overlap each other. For example, a first wire 90 connecting the first coil 33 and the second coil 33 is arranged in the lower end covering portion 32B. A second wire 90 connecting the third coil 33 and the fourth coil 33 is arranged in the lower end covering portion 32B. The second wire 90 is arranged to overlap at least a portion of the first wire 90. The protrusion 37 supports the second wire 90, thereby preventing contact between the first wire 90 and the second wire 90.

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

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

[0162] Each of the 24 coils 33 is assigned to one of the U (UV), V (VW), and W (WU) phases. The power supply lines 91 include a power supply line 91U through which a U-phase drive current flows, a power supply line 91V through which a V-phase drive current flows, and a power supply 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 this embodiment, two holding portions 38 are provided. The power line 91V is hung on one of the holding portions 38. The power line 91W is hung on the other holding portion 38.

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

[0165] The fusing terminals 92 connect the multiple wires 90 protruding from each of the multiple coils 33. The fusing terminals 92 include 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 supply line 91U is connected to a fusing terminal 92U. The power supply line 91V is connected to a fusing terminal 92V. The power supply line 91W is connected to a fusing terminal 92W.

[0167] The fusing terminal 92 is inserted into an insertion portion 39 provided in 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 of the lower anchor portions 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 of the upper anchor portions 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 accommodating 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 accommodating parts 39A. The accommodating part 39A has a recess 39C into which the base plate part 92A is inserted. A wire 90 is arranged between the accommodating 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 at 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 at 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. Coil C2 is arranged adjacent to one side in the circumferential direction of coil C1. Coil C3 is arranged adjacent to one side in the circumferential direction of coil C2. Similarly, coils C4 to C24 are arranged adjacent to one side in the circumferential direction of each of coils C3 to C23. Coil C1 is arranged adjacent to one side in the circumferential direction of coil C24.

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

[0174] In the embodiment, some of the coils 33 are formed by winding the wire 90 in a forward direction (counterclockwise). Some of the coils 33 are formed by winding the wire 90 in a reverse direction (clockwise). 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, and C24 are formed by winding the wire 90 in a forward direction. Coils C2, C3, C6, C7, C10, C11, C14, C15, C18, C19, C22, and C23 are formed by winding the wire 90 in a reverse direction.

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

[0176] 26, of the coils 33 assigned to the UV phase, those in which the wire 90 is wound in the forward direction are marked with the letters "UV," and those in which the wire 90 is wound in the reverse direction have the letters "UV" underlined. Of the coils 33 assigned to the VW phase, those in which the wire 90 is wound in the forward direction are marked with the letters "VW," and those in which the wire 90 is wound in the reverse direction have the letters "VW" underlined. Of the coils 33 assigned to the WU phase, those in which the wire 90 is wound in the forward direction are marked with the letters "WU," and those in which the wire 90 is wound in the reverse direction have the letters "WU" underlined.

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

[0178] The wire 90 stretched toward the connection side is wound to form coil C21. After the wire 90 is wound in the forward direction to form coil C21, the wire 90 is stretched toward the non-connection side, hung around the rib portion 36, and wound to form coil C22. After the wire 90 is wound in the reverse direction to form coil C22, the wire 90 is stretched toward the non-connection side, hung around the rib portion 36, and wound to form coil C4. After the wire 90 is wound in the forward direction to form coil C4, the wire 90 is stretched toward the non-connection side, hung around the rib portion 36, and wound to form coil C3. After the wire 90 is wound in the reverse direction to form coil C3, the wire 90 is stretched toward 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 toward the connection side is wound to form coil C9. After coil C9 is formed by winding the wire 90 in the forward direction, the wire 90 is stretched toward the non-connection side, hung around the rib portion 36, and wound to form coil C10. After coil C10 is formed by winding the wire 90 in the reverse direction, the wire 90 is stretched toward the non-connection side, hung around the rib portion 36, and wound to form coil C16. After coil C16 is formed by winding the wire 90 in the forward direction, the wire 90 is stretched toward the non-connection side, hung around the rib portion 36, and wound to form coil C15. After coil C15 is formed by winding the wire 90 in the reverse direction, the wire 90 is stretched toward the connection side.

[0182] The wire 90 stretched toward the connection side is wound to form coil C5. After the wire 90 is wound in the forward direction to form coil C5, the wire 90 is stretched toward the non-connection side, hung around the rib portion 36, and wound to form coil C6. After the wire 90 is wound in the reverse direction to form coil C6, the wire 90 is stretched toward the non-connection side, hung around the rib portion 36, and wound to form coil C12. After the wire 90 is wound in the forward direction to form coil C12, the wire 90 is stretched toward the non-connection side, hung around the rib portion 36, and wound to form coil C11. After the wire 90 is wound in the reverse direction to form coil C11, the wire 90 is stretched toward the connection side.

[0183] In this way, 24 coils 33 are formed.

[0184] The wire 90 between the winding start portion S arranged on the wire connection side and the coil C1, and the wire 90 between the coil C11 and the winding end portion E are each connected to a fusing 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 so as 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 so as to overlap at least a part of the wire 901. When the wire 902 is arranged so as 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 so as 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] Furthermore, wire 902 is arranged so as to overlap at least a portion of wire 903. When wire 902 is arranged so as to cover a portion of wire 903, protrusion 372 supports wire 902. By supporting wire 902, protrusion 372 prevents contact between wire 903 and wire 902. Wire 902 is arranged so as to be lifted from wire 903 by protrusion 372. This prevents contact between wire 903 and wire 902.

[0191] Furthermore, wire 902 is arranged so as to overlap at least a portion of wire 904. When wire 902 is arranged so as to cover a portion of wire 904, protrusion 373 supports wire 902. By supporting wire 902, protrusion 373 prevents contact between wire 902 and wire 904. Wire 902 is arranged so as to be lifted from wire 904 by protrusion 373. This prevents contact between wire 902 and wire 904.

[0192] Furthermore, wire 904 is arranged so as to overlap at least a portion of wire 905. When wire 904 is arranged so as to cover a portion of wire 905, protrusion 374 supports wire 904. By supporting wire 904, protrusion 374 prevents contact between wire 905 and wire 904. Wire 904 is arranged so as to be lifted from wire 905 by protrusion 374. This prevents contact between wire 905 and wire 904.

[0193] Furthermore, wire 905 is arranged so as to overlap at least a portion of wire 906. When wire 905 is arranged so as to cover wire 906, protrusion 375 supports wire 905. By supporting wire 905, protrusion 375 prevents contact between wire 906 and wire 905. Wire 905 is arranged so as to be lifted from wire 906 by protrusion 375. This prevents contact between wire 906 and wire 905.

[0194] Furthermore, wire 906 is arranged so as to overlap at least a portion of wire 907. When wire 906 is arranged so as to cover wire 907, protrusion 376 supports wire 906. By supporting wire 906, protrusion 376 prevents contact between wire 907 and wire 906. Wire 906 is arranged so as to be lifted from wire 907 by protrusion 376. This prevents contact between wire 907 and wire 906.

[0195] Furthermore, wire 907 is arranged so as to overlap at least a portion of wire 901. When wire 907 is arranged so as to cover wire 901, protrusion 377 supports wire 907. By supporting wire 907, protrusion 377 prevents contact between wire 901 and wire 907. Wire 907 is arranged so as to be lifted away from wire 901 by protrusion 377. This prevents contact between wire 901 and wire 907.

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

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

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

[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] 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, switching elements QHu, QHv, QHw, QLu, QLv, and QLw are driven by six drive patterns Dp1, Dp2, Dp3, Dp4, Dp5, and Dp6.

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

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

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

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

[0214] In the drive pattern Dp5, the switching elements QHu and QLw are turned on, so that a drive current flows from the fusing terminal 92U to the 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, the 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 performed. 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 performed.

[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 mounted on the insulator 32, a rotor 10 having a rotor cup 11, a rotor core 12 supported by the rotor cup 11, and a magnet 13 fixed to the rotor core 12, and rotating about a rotation axis AX, and a cutting blade 5 which is an output unit driven by the rotor 10. The rotor cup 11 has a core support surface 11D that supports the lower end surface 12B which is one end surface in the axial direction of the rotor core 12, and a magnet support surface 11E that supports at least a part of the lower end surface 13B which is one end surface in the axial direction of the magnet 13.

[0222] In the above configuration, rotor core 12 is supported on core support surface 11D of rotor cup 11, and magnet 13 is supported on magnet support surface 11E of rotor cup 11, thereby properly positioning rotor core 12 and magnet 13. As a result, magnet 13 is fixed to the target position of rotor core 12. Because magnet 13 is properly fixed to rotor core 12, a decrease in performance of motor 4 is suppressed.

[0223] In the embodiment, the magnet 13 is fixed to the inner circumferential surface of the rotor core 12 .

[0224] In the above configuration, the motor 4 is prevented from becoming large.

[0225] In the embodiment, the magnet 13 is fixed by adhesive.

[0226] In the above configuration, the magnet 13 is fixed to the rotor core 12 with a simple configuration.

[0227] In this embodiment, a plurality of magnets 13 are provided at intervals in the circumferential direction.

[0228] In the above configuration, each of the plurality of magnets 13 is fixed to the rotor core 12 at a target position.

[0229] In this embodiment, rotor core 12 has ring portion 12E having inner circumferential surface 12C facing outer end surfaces 13D of magnets 13 facing radially outward, and inner protrusions 12F protruding radially inward from inner circumferential surface 12C. Inner protrusions 12F are arranged between adjacent magnets 13.

[0230] In the above configuration, fluctuations in the relative positions of the plurality of magnets 13 are suppressed.

[0231] In the embodiment, the magnet support surface 11E supports a part of the lower end surface 13B of the magnet 13.

[0232] In the above configuration, an increase in the weight of the rotor cup 11 is suppressed.

[0233] In the embodiment, the magnet support surface 11E supports the center portion of the lower end surface 13B of the magnet 13 in the circumferential direction.

[0234] In the above configuration, the magnet 13 is stably supported on the magnet support surface 11E.

[0235] In the embodiment, the inner end of the magnet support surface 11E is disposed radially outward of the inner end of the lower end surface 13B of the magnet 13.

[0236] The above configuration suppresses an increase in the weight of rotor cup 11. In addition, the influence of magnet support surface 11E on the magnetic field of coil 33 is suppressed.

[0237] In this embodiment, the rotor cup 11 has a rib portion 18 that is disposed below the core support surface 11D on one axial side. The magnet support surface 11E includes an upper end surface 18A that is the end surface of the rib portion 18 on the other axial side.

[0238] In the above configuration, the magnet 13 is stably supported by the rib portion 18.

[0239] In the embodiment, the dimension of the rib portion 18 is smaller than the dimension of the magnet 13 in the circumferential direction.

[0240] The above configuration suppresses an increase in the weight of rotor cup 11. In addition, the influence of rib portion 18 on the magnetic field of coil 33 is suppressed.

[0241] In the embodiment, the rib portion 18 is disposed in the center of the magnet 13 in the circumferential direction.

[0242] In the above configuration, the magnet 13 is stably supported by the rib portion 18.

[0243] In the embodiment, 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.

[0244] In the above configuration, an increase in the weight of the rotor cup 11 is suppressed. Further, it is suppressed that the rib portion 18 affects the magnetic field of the coil 33.

[0245] In the embodiment, the number of rib portions 18 is equal to the number of magnets 13.

[0246] In the above configuration, by one rib portion 18 supporting one magnet 13, an increase in the weight of the rotor cup 11 is suppressed. Further, it is suppressed that the rib portion 18 affects the magnetic field of the coil 33.

[0247] In the embodiment, the rotor cup 11 is made of metal.

[0248] In the above configuration, the strength of the rotor cup 11 is maintained.

[0249] In the embodiment, the upper end surface 13A, which is the end surface on the other axial side of the magnet 13, protrudes from the upper end surface 12A, which is the end surface on the other axial side of the rotor core 12.

[0250] In the above configuration, the magnetic sensor 51 can accurately detect the magnet 13.

[0251] In the embodiment, at least a part of the rotor cup 11 is disposed around the rotor core 12, and an outer convex portion 12G that contacts the inner peripheral surface of the rotor cup 11 is provided on the outer peripheral surface 12D of the rotor core 12. A plurality of outer convex portions 12G are provided at intervals in the circumferential direction.

[0252] In the above configuration, an increase in the weight of the rotor cup 11 is suppressed.

[0253] In the embodiment, the electric operating machine 1 includes an adhesive layer 19 that is disposed between the adjacent outer protrusions 12G and that fixes the rotor core 12 and the rotor cup 11 together.

[0254] In the above configuration, the rotor core 12 and the rotor cup 11 are stably fixed together.

[0255] In this embodiment, at least a portion of the rotor cup 11 is provided with a discharge port 15 for discharging foreign matter inside the rotor cup 11 .

[0256] In the above configuration, foreign matter is prevented from accumulating inside rotor cup 11.

[0257] [Other embodiments] FIG. 30 is a diagram schematically illustrating a portion of a rotor 10 according to another embodiment. In the above-described embodiment, the magnet support surface 11E supports the center portion of the lower end surface 13B of the magnet 13. As shown in FIG. 30, the magnet support surface 11E may support a portion of the lower end surface 13B of a first magnet 13 and a portion of the lower end surface 13B of a 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 between two adjacent magnets 13. As shown in FIG. 30, one magnet 13 is supported by two rib portions 18.

[0258] 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 are fixed by the adhesive layer 19 disposed between the outer convex portions 12G adjacent to each other. As shown in FIGS. 31 and 32, the rotor core 12 and the rotor cup 11 may be fixed by the 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 concave portions 11F adjacent to each other 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.

[0259] In the above-described embodiment, the heights of the plurality of rib portions 36 are made equal to each other. The heights of the plurality of rib portions 36 may be different from each other.

[0260] In the above-described embodiment, the electric working machine 1 is 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 a power tool. Examples of the power 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.

[0261] In the above-described embodiment, the 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 (alternating current power source) may be used.

Explanation of Reference Numerals

[0262] 1...electric work machine, 2...housing, 3...wheel, 4...motor, 5...cutting blade, 6...cutting box, 7...handle, 8...battery mounting portion, 9...battery pack, 10...rotor, 11...rotor cup, 11A...plate portion, 11B...yoke portion, 11C...opening, 11D...core support surface, 11E...magnet support surface, 11F...recess, 11G...convex portion, 12...rotor core, 12A...upper end surface, 12B...lower end surface, 12C...inner peripheral surface, 12D...outer peripheral surface, 12E...ring portion, 12F...inner convex portion, 12G...outer convex portion, 13...magnet, 13A...upper end surface, 13B...lower end surface, 13C...inner end surface , 13D...outer end surface, 14...bush, 15...discharge port, 16...large diameter portion, 17...small diameter portion, 18...rib portion, 18A...upper end surface, 18C...inner end surface, 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 end covering portion, 32B...lower end covering portion, 32C...outer peripheral covering portion, 32D...teeth covering portion, 32E...rib portion, 33...coil, 34...upper peripheral wall portion, 35...lower peripheral wall portion, 36...rib portion, 37... Convex portion, 37A...support surface, 38...holding portion, 39...insertion portion, 39A...accommodating portion, 39B...hook portion, 39C...recessed portion, 39D...lower portion, 39E...upper portion, 39U...insertion portion, 39V...insertion portion, 39W...insertion portion, 40...stator base, 41...plate portion, 42...circumferential wall portion, 43...pipe portion, 43A...small diameter portion, 43B...large diameter portion, 43C...base support surface, 44...screw boss, 44A...base screw hole, 45...annular plate portion, 46...screw boss, 47...opening, 48...buffer member, 49...pedestal portion, 49A...pedestal portion, 49B...pedestal portion, 49C...pedestal portion, 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 portion, 62...peripheral wall portion, 63...flange portion, 64...pipe portion, 65...annular plate portion, 66...through hole, 67...screw, 68...ventilation path, 70...motor positioning mechanism, 71...base flat area, 72...base curved area, 73...stator flat area, 74...stator curved area, 75...screw, 80...board positioning mechanism,81...pin, 82...screw, 83...base pin hole, 84...board pin hole, 85...base screw hole, 86...board screw opening, 90...wire, 91...power line, 91U...power line, 91V...power line, 91W...power line, 92...fusing terminal, 92A...base plate portion, 92B...retaining plate portion, 92C...ring portion, 92D...crimping 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...rotating shaft.

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 cup, a rotor core supported by the rotor cup, and a magnet fixed to the rotor core, and rotating about a rotation axis, and an output section driven by the rotor, wherein the rotor cup has a core support surface that supports one end surface of the rotor core in the axial direction and a magnet support surface that supports the central portion of one end surface of the magnet in the axial direction in the circumferential direction, the rotor cup has a large-diameter portion having an inner circumferential surface that supports the outer circumferential surface of the rotor core and a small-diameter portion disposed on one side of the large-diameter portion in the axial direction, the core support surface is provided at the boundary between the large-diameter portion and the small-diameter portion, an electric working machine.

2. The magnet is fixed to the inner circumferential surface of the rotor core, The electric working machine according to Claim 1.

3. The magnet is fixed by an adhesive, The electric working machine according to Claim 2.

4. 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 cup, a rotor core supported by the rotor cup, and a magnet fixed to the rotor core, and rotating about a rotation axis, and an output section driven by the rotor, wherein the rotor cup has a core support surface that supports one end surface of the rotor core in the axial direction and a magnet support surface that supports at least a part of one end surface of the magnet in the axial direction, a plurality of magnets are provided at intervals in the circumferential direction, the magnet support surface supports a part of the end surface of the magnet, and in the circumferential direction, the magnet support surface supports the central portion of the end surface of the magnet, an electric working machine.

5. The rotor core has a ring portion having an inner circumferential surface facing the outer end surface of the magnet facing radially outward and an inner convex portion protruding radially inward from the inner circumferential surface, the inner convex portion is disposed between the adjacent magnets, The electric working machine according to Claim 4.

6. The magnet support surface supports a part of the end surface of the first magnet and a part of the end surface of the second magnet adjacent to the first magnet, The electric working machine according to Claim 4.

7. In the radial direction, the inner end portion of the magnet support surface is disposed outside the inner end portion of the end surface of the magnet. The electric working machine according to any one of claims 4 to 6.

8. A stator having a stator core, an insulator fixed to the stator core, and a coil attached to the insulator, A rotor cup, a rotor core supported by the rotor cup, and a magnet fixed to the rotor core, a rotor that rotates about a rotation axis, An output unit driven by the rotor, The rotor cup has a core support surface that supports an end surface on one axial side of the rotor core, and a magnet support surface that supports at least a part of an end surface on one axial side of the magnet. The rotor cup has a rib portion disposed on one axial side of the core support surface. The magnet support surface includes an end surface on the other axial side of the rib portion. Electric working machine.

9. In the circumferential direction, the dimension of the rib portion is smaller than the dimension of the magnet. The electric working machine according to claim 8.

10. In the circumferential direction, the rib portion is disposed at the center of the magnet. The electric working machine according to claim 9.

11. In the circumferential direction, the rib portion is disposed at a boundary portion between two adjacent magnets. The electric working machine according to claim 9.

12. In the radial direction, the inner end surface of the rib portion is disposed outside the inner end surface of the magnet. The electric working machine according to any one of claims 8 to 11.

13. The number of the rib portions is equal to the number of the magnets. The electric working machine according to any one of claims 8 to 12.

14. A stator having a stator core, an insulator fixed to the stator core, and a coil attached to the insulator, A rotor cup, a rotor core supported by the rotor cup, and a magnet fixed to the rotor core, a rotor that rotates about a rotation axis, An output unit driven by the rotor, The rotor cup has a core support surface that supports an end surface on one axial side of the rotor core, and a magnet support surface that supports at least a part of an end surface on one axial side of the magnet. The end surface on the other axial side of the magnet protrudes from the end surface on the other axial side of the rotor core. Electric working machine.

15. 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 cup, a rotor core supported by the rotor cup, and a magnet fixed to the rotor core, the rotor rotating about a rotation axis, An output section driven by the rotor, The rotor cup has a core support surface that supports one end surface of the rotor core in the axial direction and a magnet support surface that supports at least a part of one end surface of the magnet in the axial direction, At least a part of the rotor cup is disposed around the rotor core, An outer convex portion that contacts the inner peripheral surface of the rotor cup is provided on the outer peripheral surface of the rotor core, A plurality of the outer convex portions are provided at intervals in the circumferential direction, An electric working machine.

16. An adhesive layer is provided between the adjacent outer convex portions and fixes the rotor core and the rotor cup, The electric working machine according to claim 15.

17. The rotor cup is made of metal, The electric working machine according to any one of claims 1 to 16.

18. At least a part of the rotor cup is provided with a discharge port for discharging foreign matter inside the rotor cup, The electric working machine according to any one of claims 1 to 17.

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