Electric working machine

Abstract

To provide a technique capable of simplifying a production facility corresponding to a plurality of kinds of electric working machines.SOLUTION: An electric working machine according to one aspect of the present disclosure corresponds to the first type of working machine. The first type of working machine includes a first brushless motor, a controller, and a first housing. The first brushless motor includes a plurality of first coils and a first stator including an inner shape and a first outer shape. The second type of working machine includes a second brushless motor and a second housing. The second brushless motor includes a plurality of second coils and a second stator. The second stator has an inner shape common to the first brushless motor and a second outer shape different from the first outer shape.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The present disclosure relates to the shape of a stator of a motor. [Background technology]

[0002] The power tool described in Patent Document 1 includes a housing, a motor, and a fan. In the power tool, multiple protrusions on the outer periphery of the motor fit into multiple protrusions on the housing, thereby fixing the motor to the housing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5024609 Summary of the Invention [Problem to be solved by the invention]

[0004] An electric power tool is a device equipped with a motor. There are multiple types of electric power tools, and the motor characteristics vary depending on the type. The different motor characteristics require different means for fastening the motor to the housing, the motor wiring, the housing shape, and so on. Therefore, when producing multiple types of electric power tools, production equipment compatible with the multiple types of electric power tools is required, which increases the number and complexity of the production equipment.

[0005] One aspect of the present disclosure provides a technique that can simplify production facilities that accommodate a plurality of types of electric operating machines. [Means for solving the problem]

[0006] One aspect of the present disclosure is an electric work machine corresponding to a first type of work machine in a work machine group including a first type of work machine and a second type of work machine, wherein the first type of work machine includes a first brushless motor, a controller, and a first housing. The first brushless motor has a plurality of first coils and a first stator including an inner shape and a first outer shape. The controller is configured to excite the first stator. The first housing is configured to house the first brushless motor. The inner shape has a plurality of teeth and a predetermined inner diameter. The teeth have a predetermined shape. The second type of work machine includes a second brushless motor and a second housing. The second brushless motor has a plurality of second coils and a second stator. The second housing is configured to house the second brushless motor. The second stator has an inner shape common to the first brushless motor and a second outer shape different from the first outer shape.

[0007] An electric working machine according to one aspect of the present disclosure corresponds to a first type of working machine, and the stator of the first type of working machine has a common inner shape with the stator of a second type of working machine. By making the inner shapes of the stators of the first and second types of working machines common, it is possible to simplify the production facilities for a plurality of types of electric working machines.

[0008] Another aspect of the present disclosure is an electric work machine corresponding to a first type of work machine in a work machine group including a first type of work machine and a second type of work machine, wherein the first type of work machine includes a first brushless motor, a controller, and a first housing. The first brushless motor has a plurality of first coils wound in a parallel connection manner and a first stator including an inner shape and a first outer shape. The controller is configured to excite the first stator. The first housing is configured to house the first brushless motor. The inner shape has a plurality of teeth and a predetermined inner diameter. The teeth have a predetermined shape. The second type of work machine includes a second brushless motor and a second housing. The second brushless motor has a plurality of second coils wound in a series connection manner and a second stator. The second housing is configured to house the second brushless motor. The second stator has an inner shape in common with the first brushless motor.

[0009] An electric working machine according to another aspect of the present disclosure corresponds to a first type of working machine, and the first type of working machine is equipped with a parallel-connected motor. The second type of working machine is equipped with a series-connected motor. The internal shape of the stator of the parallel-connected motor is the same as the internal shape of the stator of the series-connected motor. By standardizing the internal shapes of the stators of the parallel-connected and series-connected motors, it is possible to simplify the production facilities for multiple types of electric working machines. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram showing the appearance of a convex motor electric working machine according to a first embodiment. FIG. [Figure 2] 1 is a view showing a vertical cross section of a convex motor electric working machine according to a first embodiment. [Figure 3] 2 is a diagram showing a stator and a rotor of the convex motor electric working machine according to the first embodiment. FIG. [Figure 4] 3 is a diagram showing a state in which the stator of the convex motor electric working machine according to the first embodiment is fixed to the housing. FIG. [Figure 5] 2 is a diagram showing a stator core of the convex motor electric working machine according to the first embodiment. FIG. [Figure 6] 5A and 5B are views showing engagement between the stator core and the housing of the electric working machine with a convex motor according to the first embodiment. [Figure 7] 3 is an enlarged schematic view of an engaging portion between a stator core and a housing of the electric working machine with a convex motor according to the first embodiment. FIG. [Figure 8] 3 is a diagram showing a state in which the stator of the recessed motor electric working machine according to the first embodiment is fixed to the housing. FIG. [Figure 9] 2 is a diagram showing a stator core of the recessed motor electric working machine according to the first embodiment. FIG. [Figure 10] 2 is a view showing a housing of the recessed motor electric working machine according to the first embodiment. FIG. [Figure 11] 5A and 5B are views showing engagement between the stator core and the housing of the electric working machine with a recessed motor according to the first embodiment. [Figure 12] 3 is an enlarged schematic view of an engaging portion between a stator core and a housing of the electric working machine with a recessed motor according to the first embodiment. FIG. [Figure 13] FIG. 2 is a diagram showing a schematic diagram of a connection state of coils of the convex motor electric working machine of the first embodiment. [Figure 14] FIG. 2 is a diagram showing a schematic diagram of a wire connection state of the coils of the electric working machine with a recessed motor according to the first embodiment. [Figure 15] FIG. 10 is a view showing a state in which the stator of the electric working machine with a convex motor according to the second embodiment is fixed to the housing. [Figure 16] FIG. 10 is a view showing a housing of an electric working machine with a convex motor according to a second embodiment. [Figure 17] 10A and 10B are views showing engagement between a stator core and a housing of an electric working machine with a convex motor according to a second embodiment. [Figure 18] FIG. 10 is an enlarged schematic view of an engaging portion between a stator core and a housing of an electric working machine with a convex motor according to a second embodiment. [Figure 19]FIG. 11 is a view showing a state in which the stator of the electric working machine with a convex motor according to the third embodiment is fixed to the housing. [Figure 20] Fig. 20A is a diagram showing a state in which a stator of an electric working machine with a convex motor according to a fourth embodiment is fixed to a housing, and Fig. 20B is a diagram of Fig. 20A with the baffle removed. [Figure 21] FIG. 11 is a view showing a state in which an insulator of an electric working machine with a recessed motor according to a fifth embodiment is fixed to a housing. [Figure 22] 10A and 10B are diagrams showing an insulator of an electric working machine with a recessed motor according to a fifth embodiment. [Figure 23] 10A and 10B are views showing engagement between an insulator and a housing of an electric working machine with a recessed motor according to a fifth embodiment. [Figure 24] FIG. 11 is an enlarged schematic view of an engaging portion between an insulator and a housing of an electric working machine with a recessed motor according to a fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] [Summary of the embodiment] An embodiment may provide an electric power tool having at least one of the following features: Feature 1: Corresponds to a first type of working machine in a working machine group including a first type of working machine and a second type of working machine. ·Feature 2: The first type of work machine includes a first brushless motor. Feature 3: The first brushless motor has a plurality of first coils. Feature 4: The first brushless motor has a first stator including an inner shape and a first outer shape. Feature 5: The first type of working machine includes a controller configured to excite the first stator. Feature 6: The first type of working machine includes a first housing configured to house a first brushless motor. Feature 7: The inner shape has a plurality of teeth having a predetermined shape and a predetermined inner diameter, ·Feature 8: The second type of work machine is equipped with a second brushless motor. Feature 9: The second brushless motor has a plurality of second coils. Feature 10: The second brushless motor has a second stator. Feature 11: The second type of work machine includes a second housing configured to accommodate a second brushless motor. Feature 12: The second stator has an inner shape common to the first brushless motor and a second outer shape different from the first outer shape.

[0012] An electric working machine having at least Features 1 to 13 corresponds to a first type of working machine, and the stator of the first type of working machine has a common inner shape with the stator of the second type of working machine. By standardizing the inner shape of the stators of the first and second type of working machines, it is possible to simplify the production facilities for multiple types of electric working machines.

[0013] Some embodiments may include at least one of the following features in addition to or instead of at least one of Features 1 to 13 above. Feature 14: The first housing has a first inner circumferential surface and a first engaging portion disposed on the first inner circumferential surface. Feature 15: The first outer shape has a first outer peripheral surface facing the first inner peripheral surface, and a second engaging portion disposed on the first outer peripheral surface and configured to engage with the first engaging portion. Feature 16: The second housing has a second inner circumferential surface and a third engaging portion that is disposed on the second inner circumferential surface and has a shape different from that of the first engaging portion. Feature 17: The second outer shape has a second outer peripheral surface facing the second inner peripheral surface, and a fourth engaging portion disposed on the second outer peripheral surface, having a shape different from that of the second engaging portion, and configured to engage with the third engaging portion.

[0014] The inner shape of the stator of an electric operating machine having at least Features 1 to 17 can be made common to the inner shape of the stator of another type of electric operating machine that has a different fixing structure for the stator relative to the housing.

[0015] Some embodiments may include the following features in addition to or instead of at least one of Features 1 to 17 above. Feature 18: The second engaging portion has a stator recess that is recessed radially inward from the first outer peripheral surface. Feature 19: The fourth engagement portion has a stator protrusion that protrudes radially outward beyond the first outer circumferential surface. An electric working machine having at least features 1 to 3 and 18 to 19 is fixed to a housing by a stator recess, and the inner shape of the stator can be made common with the inner shape of an electric working machine fixed to a housing by a stator protrusion.

[0016] Some embodiments may include the following features in addition to or instead of at least one of Features 1 to 19 above. Feature 20: The stator recess is disposed outside at least one of the plurality of teeth in the radial direction of the first stator.

[0017] An electric working machine having at least features 1 to 13 and 18 to 20 has stator recesses arranged radially outside the teeth, thereby suppressing an increase in the magnetic resistance of the stator due to the formation of recesses on the outer peripheral surface of the stator.

[0018] In some embodiments, the following features may be provided in addition to or instead of at least one of Features 1 to 20 described above. Feature 21: The first engaging portion has a housing protrusion that protrudes radially inward beyond the first inner circumferential surface. Feature 22: The housing protrusion has a first flat surface and a second flat surface. Feature 23: The connection portion between the first flat surface and the second flat surface protrudes radially inward beyond the first inner circumferential surface. Feature 24: The stator recess has a third plane and a fourth plane. Feature 25: The connection portion between the third flat surface and the fourth flat surface is recessed radially inward from the first outer peripheral surface. Feature 26: When the housing protrusion is engaged with the stator recess, the first flat surface contacts the third flat surface, and the second flat surface contacts the fourth flat surface.

[0019] An electric working machine having at least features 1 to 13, 18 to 19, and 21 to 26 can firmly fix the circumferential position of the stator relative to the housing by engaging the two surfaces of the recessed portion of the stator with the two surfaces of the protruding portion of the housing.

[0020] In some embodiments, the following features may be provided in addition to or instead of at least one of the features 1 to 26 described above. Feature 27: The plurality of first coils are wound around the plurality of teeth in a parallel connection manner.

[0021] In some embodiments, the following features may be provided in addition to or instead of at least one of the features 1 to 22 described above. Feature 28: The first stator includes a plurality of fusing terminals. Feature 29: The first stator includes a plurality of short-circuit members. Feature 30: Two adjacent first coils among the plurality of first coils are connected via a fusing terminal. Feature 31: Each of the plurality of short-circuiting members connects together fusing terminals corresponding to the same phase among the plurality of fusing terminals.

[0022] In an electric operating machine having at least the features 1 to 15, 18 to 19, and 27 to 31, the first coils can be easily connected in parallel by the fusing terminal and the short-circuiting member.

[0023] In some embodiments, the following features may be provided in addition to or instead of at least one of the features 1 to 31 described above. Feature 32: The first stator includes a first stator core having an inner shape and a first outer shape. Feature 33: The second stator includes a second stator core having an inner shape and a second outer shape.

[0024] In the electric operating machine and the second-class operating machine having at least Features 1 to 15 and 32 to 33, the axial height of the stator can be reduced by arranging the engaging portion on the stator core. Furthermore, the transmission of vibrations caused by the rotation of the motor to the coil can be reduced, thereby preventing the coil from breaking.

[0025] In some embodiments, the following features may be provided in addition to or instead of at least one of the features 1 to 33 described above. Feature 34: The second engaging portion has a stator protrusion that protrudes radially outward beyond the first outer circumferential surface. Feature 35: The fourth engagement portion has a stator recess that is recessed radially inward from the first outer peripheral surface.

[0026] In one embodiment, an electric power tool may be provided that has at least one of the following features: Feature 36: An electric work machine corresponding to a first type work machine in a work machine group including a first type work machine and a second type work machine. Feature 37: The first type of work machine includes a first brushless motor. Feature 38: The first brushless motor has a plurality of first coils wound in a parallel connection manner. Feature 39: A first brushless motor has a first stator including an inner shape and a first outer shape. Feature 40: The first type of work machine includes a controller configured to excite the first stator. Feature 41: A first type of working machine includes a first housing configured to house a first brushless motor. Feature 42: The inner shape has a plurality of teeth having a predetermined shape and a predetermined inner diameter. Feature 43: The second type of work machine includes a second brushless motor. Feature 44: The second brushless motor has a plurality of second coils wound in a series connection manner. Feature 45: The second brushless motor has a second stator. Feature 46: The second type of work machine includes a second housing configured to accommodate a second brushless motor. Feature 47: The second stator has the same inner shape as the first brushless motor.

[0027] An electric working machine having at least features 36 to 47 corresponds to a first type of working machine equipped with a parallel-connected motor, and a second type of electric working machine equipped with a series-connected motor. The inner shape of the stator of the parallel-connected motor is the same as the inner shape of the stator of the series-connected motor. By standardizing the inner shape of the stator of the first and second type of working machines, it is possible to simplify the production facilities for multiple types of electric working machines.

[0028] In some embodiments, the following features may be provided in addition to or instead of at least one of the features 36 to 47 described above. Feature 48: The second stator has a second outer shape that is different from the first outer shape.

[0029] The external shape of the stator of the parallel-connected motor provided in the electric working machine having at least Features 36 to 48 can be made different from the external shape of the stator of the series-connected motor.

[0030] In some embodiments, the following features may be provided in addition to or instead of at least one of the features 36 to 48 described above. Feature 49: The first stator is fixed to the first housing by screws in the direction of the rotation axis of the first brushless motor. Feature 50: The second stator is fixed to the second housing in the direction of the rotation axis of the second brushless motor by the second housing without screw fastening.

[0031] In an electric working machine having at least Features 36 to 50, the stator can be fixed to the housing in the direction of the rotation axis by screwing. In a second type electric working machine, the stator can be fixed to the housing in the direction of the rotation axis without screwing.

[0032] In some embodiments, the following features may be provided in addition to or instead of at least one of the features 36 to 50 described above. Feature 51: The first housing includes a unitary cylindrical body. Feature 52: The second housing includes a pair of halves. In an electric working machine having at least features 36 to 52, the housing is a one-piece cylindrical body, and the stator can be inserted into the housing to fix its circumferential position relative to the housing, and the stator can be fixed in its position in the rotational axis direction relative to the housing by screwing. In a second type working machine, the housing is a pair of halves, and the stator can be assembled to the housing to fix its position in the circumferential direction and the rotational axis direction relative to the housing.

[0033] Examples of the above-mentioned first and second type working machines include various types of equipment configured to be used at work sites such as construction, manufacturing, gardening, and civil engineering, specifically, power tools for masonry, metalwork, and woodworking, power tools for gardening, power tools for improving the environment at work sites, fan vests, fan jackets, pushcarts, electrically assisted bicycles, air pumps, etc. The first type working machine may be a working machine used for the same purpose as the second type working machine, or may be a working machine used for a different purpose.

[0034] Examples of the power tools mentioned above include electric chainsaws, electric hand saws, electric blowers, electric hammers, electric hammer drills, electric drills, electric screwdrivers, electric wrenches, electric impact drivers, electric impact wrenches, electric grinders, electric circular saws, electric reciprocating saws, electric jigsaws, electric cutters, electric planers, electric nail guns (including tackers), electric hedge trimmers, electric lawn mowers, electric lawn clippers, electric brush cutters, electric cleaners, electric sprayers, electric spreaders, electric dust collectors, electric trowels, electric vibrators, electric rammers, electric compactors, electric pumps, electric pile drivers, electric concrete saws, electric screeds, and electric cut-off saws.

[0035] The above-mentioned examples of the first and second type working machines may be in the form of battery-powered equipment configured to be powered by a battery. Specifically, the above-mentioned examples of the electric working machine may have a built-in battery or may be configured to have a detachable battery pack attached. The battery pack houses the battery.

[0036] In some embodiments, the above features 1 to 52 may be combined in any manner. In some embodiments, any of the above features 1-52 may be omitted.

[0037] Specific Exemplary Embodiments Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0038] (1. First embodiment) <1-1. Overall structure> A work machine group according to this embodiment will be described with reference to Figures 1 and 2. The work machine group includes multiple types of work machines manufactured by the same manufacturer. For example, the work machine group includes multiple types of work machines bearing a common logo associated with the manufacturer. In this embodiment, the work machine group includes a convex motor electric work machine 1A and a recessed motor electric work machine 1B. The convex motor electric work machine 1A and the recessed motor electric work machine 1B according to this embodiment are impact drivers, which are a type of power tool.

[0039] First, the basic configuration of the convex motor electric work machine 1A will be described. The basic configuration of the convex motor electric work machine 1A is the same as the basic configuration of the recessed motor electric work machine 1B. The difference is that the convex motor electric work machine 1A is equipped with a motor unit 20, while the recessed motor electric work machine 1B is equipped with a motor unit 120. In the following, relative positions or directions are shown with the center of the convex motor electric work machine 1A as the reference.

[0040] The convex motor electric work machine 1A includes a head portion 10, a motor unit 20, a grip 5, a battery mounting portion 6, a chuck sleeve 7, and a trigger 8. The motor unit 20 is fixed to the rear end of the head portion 10 with a screw 15. The motor unit 20 includes a motor 25 (described later) and a housing 90. The chuck sleeve 7 is provided at the front end of the head portion 10. Various tool bits are detachably attached to the chuck sleeve 7. Examples of the various tool bits include a driver bit and a socket bit.

[0041] The grip 5 is provided at the lower end of the head portion 10 and the motor unit 20, and extends in the vertical direction. The grip 5 is held by a user of the convex motor electric work machine 1A. The battery attachment portion 6 is provided at the lower end of the grip 5. A battery pack 3 is detachably attached to the battery attachment portion 6. The battery pack 3 includes multiple cells connected in series and is, for example, a rechargeable lithium-ion battery.

[0042] The trigger 8 is provided on the upper front surface of the grip 5. The trigger 8 is manually operated by the user. Specifically, when the user pulls the trigger 8, the motor 25 rotates, and when the user releases the trigger 8, the motor 25 stops.

[0043] The head portion 10 includes a spindle 14, a coil spring 13, a hammer 12, and an anvil 11 therein. The spindle 14 is connected to a shaft 16 of a motor 25 via a planetary gear mechanism. The spindle 14 rotates as the motor 25 rotates. The hammer 12 is connected to the spindle 14 and can rotate integrally with the spindle 14. The hammer 12 can move along the rotation axis of the spindle 14 (i.e., in the front-to-rear direction). The hammer 12 is biased forward by the coil spring 13. The anvil 11 rotates by receiving rotational force and / or impact force from the hammer 12. A chuck sleeve 7 is attached to the front end of the anvil 11.

[0044] When the spindle 14 is rotated by the motor 25, the hammer 12 rotates integrally with the spindle 14. When the hammer 12 rotates, the rotational force of the hammer 12 is transmitted to the anvil 11. When the anvil 11 rotates, the chuck sleeve 7 rotates integrally with the anvil 11. This causes the tool bit attached to the chuck sleeve 7 to rotate.

[0045] The grip 5 has a controller 100 inside its lower end. The controller 100 is activated by receiving power from the battery pack 3 and controls various functions of the convex motor electric work machine 1A. For example, the controller 100 controls the drive current supplied to the motor 25 from the battery pack 3, thereby controlling the drive of the motor 25.

[0046] <1-2. Motor configuration> <1-2-1. Cylindrical housing, convex stator core, series-connected motor> Next, the motor unit 20 provided in the convex motor electric work machine 1A will be described with reference to Figures 3 to 7. The motor unit 20 includes a motor 25, a fan 80, a substrate 62, and a housing 90. The motor 25 is an inner rotor type motor including a rotor 70 and a stator 30. In this embodiment, the motor 25 is an 8-pole, 6-slot, three-phase brushless motor.

[0047] Hereinafter, the direction parallel to the rotation axis AX of the motor 25 will be referred to as the axial direction, and the radial direction of the rotation axis AX will be referred to as the radial direction. The axial direction coincides with the front-to-rear direction. The direction going around the rotation axis AX will be referred to as the circumferential direction. In the radial direction, a position closer to or approaching the rotation axis AX will be referred to as the radially inner direction, and a position farther from or away from the rotation axis AX will be referred to as the radially outer direction. Furthermore, within the circumferential direction, the direction facing forward from bottom to top will be referred to as the first direction, and the direction from top to bottom will be referred to as the second direction.

[0048] <1-2-1a. Rotor> 3 is a perspective view showing the rotor 70 and the stator 30 from behind. The rotor 70 has a rotor core 73, a rotor shaft 71, and a plurality of magnetic pole portions 72. The rotor 70 rotates about a rotation axis AX.

[0049] The rotor core 73 includes a plurality of stacked steel plates. The steel plates are made of a metal whose main component is iron. The rotor core 73 is arranged to surround the rotation axis AX. The rotor core 73 has a generally cylindrical shape. An opening is formed in the center of the rotor core 73 so as to penetrate from the front surface to the rear surface of the rotor core 73.

[0050] The rotor shaft 71 is disposed in a central opening of the rotor core 73 and extends in the axial direction. The rotor shaft 71 is fixed to the rotor core 73. The front portion of the rotor shaft 71 protrudes forward from the front end portion of the rotor core 73 and is rotatably supported by a front bearing (not shown). The rear portion of the rotor shaft 71 protrudes rearward from the rear end portion of the rotor core 73 and is rotatably supported by a rear bearing (not shown).

[0051] The multiple magnetic pole portions 72 are arranged at regular intervals around the rotor core 73. Each of the multiple magnetic pole portions 72 has a permanent magnet embedded in the rotor core 73 and extends along the radial direction. That is, the multiple magnetic pole portions 72 are arranged in a spoke shape. Each of the multiple magnetic pole portions 72 has an N-pole region and an S-pole region, and the multiple magnetic pole portions 72 are arranged so that like poles face each other along the circumferential direction. That is, the N-pole of a certain magnetic pole portion 72 faces the N-pole of the magnetic pole portion 72 adjacent in the circumferential direction. Also, the S-pole of a certain magnetic pole portion 72 faces the S-pole of the magnetic pole portion 72 adjacent in the circumferential direction. In this embodiment, the multiple magnetic pole portions 72 include eight magnetic pole portions 72.

[0052] The fan 80 is fixed to the front portion of the rotor shaft 71. The fan 80 is disposed forward of the rotor core 73. When the rotor shaft 71 rotates, the fan 80 rotates together with the rotor shaft 71.

[0053] <1-2-1b. Stator> The stator 30 includes a stator core 40, a first insulator 51, a second insulator 52, a plurality of coils 34, and a power supply line 61. The first insulator 51 and the second insulator 52 may be fixed to the stator core 40 by integral molding.

[0054] The stator core 40 includes a plurality of stacked steel plates. The steel plates are metal plates whose main component is iron. The stator core 40 is formed in a cylindrical or annular shape. The stator core 40 has an inner shape 40A and an outer shape 40B. The inner shape 40A is a shape that includes the inner circumferential surface 49 of the stator core 40 and is radially inward of the inner circumferential surface 49. The outer shape 40B is a shape that is radially outward of the inner circumferential surface 49 of the stator core 40.

[0055] The inner shape 40A has a plurality of teeth 41 that support the coils 34 and an inner diameter R1. The teeth 41 have a predetermined shape and protrude radially inward from an inner circumferential surface 49 of the stator core 40. In this embodiment, the stator core 40 has six teeth 41. The six teeth 41 are arranged at equal intervals in the circumferential direction. The outer shape 40B has a plurality of convex engaging portions 43 (described later) and an outer diameter R2. The inner diameter R1 is the distance from the center of the stator core 40 (i.e., the position of the rotation axis AX) to the inner circumferential surface 49 of the stator core 40. The outer diameter R2 is the distance from the center of the stator core 40 to the outer circumferential surface 48 of the stator core 40.

[0056] The first insulator 51 is an electrical insulating member made of synthetic resin. The first insulator 51 is formed in a cylindrical or annular shape. The first insulator 51 is fixed to the front part of the stator 30. The first insulator 51 has a plurality of protrusions 511 that support the coils 34. The protrusions 511 protrude radially inward from the inner circumferential surface of the first insulator 51. The number of protrusions 511 provided is the same as the number of teeth 41. The rear ends of the protrusions 511 are connected to the front ends of the teeth 41.

[0057] The second insulator 52 is an electrical insulating member made of synthetic resin. The second insulator 52 is formed in a cylindrical or annular shape. The second insulator 52 is fixed to the rear portion of the stator 30. The second insulator 52 has a plurality of protrusions 521 that support the coils 34. The protrusions 521 protrude radially inward from the inner circumferential surface of the second insulator 52. The number of protrusions 521 provided is the same as the number of teeth 41. The front ends of the protrusions 521 are connected to the rear ends of the teeth 41.

[0058] The multiple coils 34 are wound around the teeth 41 of the stator core 40 in a series connection manner via the first insulator 51 and the second insulator 52. More specifically, each of the multiple coils 34 is wound around one tooth 41 via the protrusion 511 and the protrusion 521. That is, in this embodiment, six coils 34 are provided. Each of the six coils 34 is disposed around the tooth 41, the protrusion 511, and the protrusion 521. The six coils 34 and the stator core 40 are electrically insulated by the first insulator 51 and the second insulator 52.

[0059] The six coils 34 are formed by winding a single wire. Circumferentially adjacent coils 34 are connected by a connecting wire 341, which is part of the wire. The connecting wire 341 is located between one coil 34 and the other coils 34, and is supported by the second insulator 52.

[0060] The power supply line 61 is connected to the battery pack 3 via the controller 100. The battery pack 3 supplies a driving current to the motor 25 via the controller 100. The controller 100 supplies the driving current from the battery pack 3 to the motor 25 to excite the stator 30.

[0061] Power supply lines 61 include a U-phase power supply line 61U, a V-phase power supply line 61V, and a W-phase power supply line 61W. A U-phase drive current is supplied to U-phase power supply line 61U. A V-phase drive current is supplied to V-phase power supply line 61V. A W-phase drive current is supplied to W-phase power supply line 61W.

[0062] The six coils 34 include three pairs of coils, and each pair of coils is assigned to one of the U-phase, V-phase, and W-phase. That is, pairs of coils 34 are assigned to the U-phase, V-phase, and W-phase. The first pair of coils 34 is assigned to the U-phase and includes a U-phase coil 34U1 and a U-phase coil 34U2. The U-phase coil 34U1 and the U-phase coil 34U2 are arranged to face each other in the radial direction. The second pair of coils 34 is assigned to the V-phase and includes a V-phase coil 34V1 and a V-phase coil 34V2. The V-phase coil 34V1 and the V-phase coil 34V2 are arranged to face each other in the radial direction. The third pair of coils 34 is assigned to the W-phase and includes a W-phase coil 34W1 and a W-phase coil 34W2. The W-phase coil 34W1 and the W-phase coil 34W2 are arranged to face each other in the radial direction. Specifically, in the circumferential direction, V-phase coil 34V1 is arranged next to U-phase coil 34U1, and W-phase coil 34W1 is arranged next to V-phase coil 34V1. U-phase coil 34U2 is arranged next to W-phase coil 34W1, V-phase coil 34V2 is arranged next to U-phase coil 34U2, W-phase coil 34W2 is arranged next to V-phase coil 34V2, and U-phase coil 34U1 is arranged next to W-phase coil 34W2.

[0063] 13, U-phase coils 34U1 and 34U2, V-phase coils 34V1 and 34V2, and W-phase coils 34W1 and 34W2 are delta-connected in series. U-phase power supply line 61U is connected to connection line 341 that connects U-phase coil 34U1 and V-phase coil 34V2. V-phase power supply line 61V is connected to connection line 341 that connects V-phase coil 34V1 and W-phase coil 34W2. W-phase power supply line 61W is connected to connection line 341 that connects W-phase coil W1 and U-phase coil U2.

[0064] The controller 100 controls the current flowing through the U-phase coils 34U1, U2, the V-phase coils 34V1, V2, and the W-phase coils 34W1, W2 by switching the current through the U-phase power line 61U, the V-phase power line 61V, and the W-phase power line 61W.

[0065] The substrate 62 is disposed behind the second insulator 52. As shown in FIG. 4, three Hall sensors 621 corresponding to the U phase, V phase, and W phase are attached to the front surface of the substrate 62. Detection signals of the three Hall sensors 621 are output to the controller 100 via signal lines. The controller 100 controls the drive currents supplied to the six coils 34 based on the detection signals of the three Hall sensors 621.

[0066] <1-2-1c. Fixing the stator> 4 to 7, the fixing of the stator 30 to the housing 90 will be described. The axial position and circumferential position of the stator 30 relative to the housing 90 are fixed.

[0067] The housing 90 is a one-piece cylindrical body. The housing 90 has a square protrusion 92 and a plurality of semicircular protrusions 93. The square protrusion 92 is formed by a side surface of the housing 90 protruding downward in a square shape. The square protrusion 92 accommodates the power line 61. Each of the semicircular protrusions 93 is formed by a side surface of the housing 90 protruding semicircularly outward in the radial direction. In this embodiment, the housing 90 has four semicircular protrusions 93. A screw 94 is inserted into each of the semicircular protrusions 93. The stator 30 is inserted through an opening in the housing 90 and then screwed to the housing 90 with the screw 94. This fixes the axial position of the stator 30 relative to the housing 90.

[0068] One of the plurality of semicircular protrusions 93 includes a housing engagement portion 921 that protrudes in a first direction. Another of the plurality of semicircular protrusions 93 includes a housing engagement portion 931 that protrudes in a second direction. The housing engagement portion 921 has a flat surface 922 that is parallel to the radial direction. The housing engagement portion 931 includes a flat surface 932 that is parallel to the radial direction.

[0069] 5, the outer shape 40B of the stator core 40 has a plurality of convex engaging portions 43. The plurality of convex engaging portions 43 are arranged at predetermined intervals on the outer peripheral surface 48 of the stator core 40. In this embodiment, the outer shape 40B has four convex engaging portions 43.

[0070] Each of the convex engaging portions 43 includes a convex portion 43a and a convex portion 43b. The convex portions 43a and 43b protrude radially outward from the outer peripheral surface 48 of the stator core 40. The convex portions 43a and 43b are arranged side by side in the circumferential direction. Arranging the convex engaging portions 43 on the stator core 40 reduces the length (height) of the stator 30 in the front-rear direction compared to when the convex engaging portions 43 are arranged on the first insulator 51 or the second insulator 52. Arranging the convex engaging portions 43 on the stator core 40 also reduces the transmission of vibration to the wire via the first insulator 51 or the second insulator 52 that supports the wire. Consequently, wire breakage is reduced. The vibrations described above include vibrations transmitted from the output section of the convex motor electric working machine 1A to the motor 25 during use of the convex motor electric working machine 1A and vibrations associated with the rotation of the motor 25.

[0071] As shown in FIG. 7 , the protruding portion 43a has a first flat surface 431 and a third flat surface 433. The protruding portion 43b has a second flat surface 432 and a fourth flat surface 434. The first flat surface 431 and the second flat surface 432 protrude from the outer peripheral surface 48 of the stator core 40 parallel to the radial direction. The third flat surface 433 is inclined from the outer peripheral surface 48 of the stator core 40 toward the outer end of the first flat surface 431. The fourth flat surface 434 is inclined from the outer peripheral surface 48 of the stator core 40 toward the outer end of the second flat surface 432. The third flat surface 433 and the fourth flat surface 434 are located between the first flat surface 431 and the second flat surface 432 in the circumferential direction.

[0072] When the stator 30 is accommodated in the housing 90, one of the protruding engaging portions 43 engages with the housing engaging portion 921, and another of the protruding engaging portions 43 engages with the housing engaging portion 931. This fixes the circumferential position of the stator 30 with respect to the housing 90. More specifically, a first flat surface 431 of a protruding portion 43a included in one of the protruding engaging portions 43 comes into contact with a flat surface 922 of the housing engaging portion 921, thereby restricting rotation of the stator 30 in a first direction with respect to the housing 90. Furthermore, a second flat surface 432 of a protruding portion 43b included in the other of the protruding engaging portions 43 comes into contact with a flat surface 932 of the housing engaging portion 931, thereby restricting rotation of the stator 30 in a second direction with respect to the housing 90.

[0073] <1-2-2. Motor with half housing, recessed stator core, and parallel connection> <1-2-2a. Stator> Next, with reference to Figures 8 to 12, the motor unit 120 included in the recessed motor electric work machine 1B will be described in terms of differences from the motor unit 20. The motor unit 120 includes a stator 130 instead of the stator 30, a housing 190 instead of the housing 90, and a substrate 162 instead of the substrate 62. In the stator 130, the six coils 34 are wound around the six teeth 41 in a parallel connection manner.

[0074] Similar to the board 62, the board 162 has three hall sensors 621 (not shown) arranged on the front surface. Stator 130 includes a plurality of fusing terminals 195 and a plurality of short-circuit members 196 in addition to the configuration of stator 30. Furthermore, the plurality of coils 34 of stator 130 are arranged similarly to the plurality of coils 34 of stator 30. That is, in stator 130, a pair of U-phase coils 34U1, 34U2 are arranged opposite each other in the radial direction. A pair of V-phase coils 34V1, 34V2 are arranged opposite each other in the radial direction. A pair of W-phase coils 34W1, 34W2 are arranged opposite each other in the radial direction.

[0075] The multiple fusing terminals 195 are conductive members. The multiple fusing terminals 195 are supported by the second insulator 52 and are arranged at equal intervals in the circumferential direction. Each of the multiple fusing terminals 195 is arranged between adjacent coils 34. The stator 130 includes the same number of fusing terminals 195 as the number of coils 34. In this embodiment, six fusing terminals 195 are provided. In this embodiment, the stator 130 includes six fusing terminals 195. Specifically, the multiple fusing terminals 195 include a pair of U-phase fusing terminals 195U, a pair of V-phase fusing terminals 195V, and a pair of W-phase fusing terminals 195W.

[0076] One U-phase fusing terminal 195U is disposed between U-phase coil 34U1 and V-phase coil 34V1. Connection line 341 connects U-phase coil 34U1 and V-phase coil 34V1 via U-phase fusing terminal 195U. The other U-phase fusing terminal 195U is disposed between U-phase coil 34U2 and V-phase coil 34V2. Connection line 341 connects U-phase coil 34U2 and V-phase coil 34V2 via U-phase fusing terminal 195U.

[0077] One V-phase fusing terminal 195V is disposed between V-phase coil 34V1 and W-phase coil 34W1. Connection wire 341 connects V-phase coil 34V1 and W-phase coil 34W1 via V-phase fusing terminal 195V. The other V-phase fusing terminal 195V is disposed between V-phase coil 34V2 and W-phase coil 34W2. Connection wire 341 connects V-phase coil 34V2 and W-phase coil W2 via V-phase fusing terminal 195V.

[0078] One W-phase fusing terminal 195W is disposed between W-phase coil 34W1 and U-phase coil 34U1. Connection wire 341 connects W-phase coil 34W1 and U-phase coil 34U1 via W-phase fusing terminal 195W. The other W-phase fusing terminal 195W is disposed between W-phase coil 34W2 and U-phase coil 34U2. Connection wire 342 connects W-phase coil 34W2 and U-phase coil 34U2 via W-phase fusing terminal 195W.

[0079] The multiple short-circuit members 196 are conductive plate-like members. Each of the short-circuit members 196 is curved to conform to the shape of the stator 130 and is disposed on the front side of the substrate 162. The stator 130 includes the same number of short-circuit members 196 as the number of phases of the coils 34. In this embodiment, the multiple short-circuit members 196 include a U-phase short-circuit member 196U, a V-phase short-circuit member 196V, and a W-phase short-circuit member 196W.

[0080] The U-phase short-circuit member 196U connects (i.e., shorts) the pair of U-phase fusing terminals 195U and the U-phase power line 61U. The V-phase short-circuit member 196V connects (i.e., shorts) the pair of V-phase fusing terminals 195V and the V-phase power line 61V. The W-phase short-circuit member 196W connects (i.e., shorts) the pair of W-phase fusing terminals 195W and the W-phase power line 61W.

[0081] 14, U-phase coil 34U1, V-phase coil 34V1, and W-phase coil 34W1 are connected to form a first delta connection. U-phase coil 34U2, V-phase coil 34V2, and W-phase coil 34W2 are connected to form a second delta connection. The first delta connection is connected in parallel to the second delta connection. Therefore, in this embodiment, the six coils 34 are delta-connected in two-parallel configurations.

[0082] <1-2-2b. Fixing the stator> 9 to 12, the fixing of the stator 130 to the housing 190 will be described. The axial position and circumferential position of the stator 130 relative to the housing 190 are fixed.

[0083] Stator 130 includes stator core 140 instead of stator core 40. Stator core 140 includes a plurality of laminated steel plates. As shown in FIG. 9 , stator core 140 includes inner shape 40A and outer shape 140B. That is, stator core 140 has the same inner shape as stator core 40, and has a different outer shape from stator core 40.

[0084] The outer shape 140B has a plurality of concave engagement portions 143 and an outer diameter R3. The outer diameter R3 may be the same as or different from the outer diameter R2. Each of the concave engagement portions 143 has a different shape from the convex engagement portions 43. The plurality of concave engagement portions 143 are arranged radially outward from some of the plurality of teeth 41. In this embodiment, the outer shape 140B has four concave engagement portions 143. The four concave engagement portions 143 are arranged radially outward from four of the six teeth 41.

[0085] Each of the concave engaging portions 143 is recessed (concave) radially inward from the outer circumferential surface 148 of the stator core 140. The formation of the concave portions narrows the width of the magnetic path of the stator core 140 compared to when no concave portions are formed, and magnetic resistance increases. However, the width of the magnetic path is originally wide at the locations of the stator core 140 where the teeth 41 are arranged. Therefore, by arranging the concave engaging portions 143 radially outward from the teeth 41, the rate of increase in magnetic resistance is suppressed compared to when the concave engaging portions 143 are arranged radially outward from locations where the teeth 41 are not arranged.

[0086] The stator core 140 has the same inner shape 40A as the stator core 40. The stator cores 40, 140 are punched using a progressive die. Progressive punching using a progressive die includes multiple linked processes in which partial punching is performed, and punching is performed one after another while automatically feeding the material to the next process after each shot. The stator core 140 is manufactured by adding a process of cutting out a portion of the outer periphery to the progressive punching of the stator core 40. The presence or absence of the process of cutting out a portion of the outer periphery can be easily switched by changing the blade position using hydraulic pressure. Therefore, the stator cores 40 and 140 can be manufactured on the same production line. This simplifies the production facilities for multiple types of electric working machines, including the convex motor electric working machine 1A and the concave motor electric working machine 1B.

[0087] 10, housing 190 is a cylindrical body and is composed of a pair of half bodies 191A and 191B. Half body 191A constitutes the left half of housing 190, and half body 191B constitutes the right half of housing 190. Half body 191A is assembled to stator 130 from the left, and half body 191B is assembled to stator 130 from the right.

[0088] The housing 190 includes a square protrusion 192, a plurality of housing engagement portions 193, and a plurality of pairs of regulating members 194. Each of the plurality of housing engagement portions 193 has a different shape from the housing engagement portions 921, 931. The square protrusion 192 is formed by protruding in a square shape from the side surface of the housing 190. The square protrusion 192 accommodates the power line 61. The housing 190 includes the same number of housing engagement portions 193 as the number of recessed engagement portions 143. In this embodiment, the plurality of housing engagement portions 193 includes four housing engagement portions 193. Furthermore, in this embodiment, the plurality of pairs of regulating members 194 includes four pairs of regulating members 194.

[0089] The four housing engaging portions 193 are arranged on the inner circumferential surface 198 of the housing 190 at positions facing the concave engaging portions 143. Each of the housing engaging portions 193 protrudes radially inward from the inner circumferential surface 198 of the housing 190. When the half bodies 191A, 191B are assembled to the stator 130, the four concave engaging portions 143 engage with the four housing engaging portions 193, respectively. This restricts rotation of the stator 130 in the first direction and the second direction relative to the housing 190. In other words, the circumferential position of the stator 130 is fixed relative to the housing 190.

[0090] 12, each of the housing engaging portions 193 has a first flat surface 193a, a second flat surface 193b, and a connecting portion 199. Each of the concave engaging portions 143 has a third flat surface 143a, a fourth flat surface 143b, and a connecting portion 149. The second flat surface 193b is located closer to the first direction than the first flat surface 193a. The first flat surface 193a and the second flat surface 193b are inclined from an inner circumferential surface 198 of the housing 190 toward the tip of the housing engaging portion 193. The connecting portion 199 connects the first flat surface 193a and the second flat surface 193b. The connecting portion 199 protrudes radially inward from the inner circumferential surface 198 of the housing 190.

[0091] The fourth plane 143b is located closer to the first direction than the third plane 143a. The third plane 143a and the fourth plane 143b are inclined from the outer peripheral surface 148 of the stator core 140 toward the center of the concave engagement portion 143. The connecting portion 149 connects the third plane 143a and the fourth plane 143b. The connecting portion 149 is recessed radially inward from the outer peripheral surface 148 of the stator core 140.

[0092] When the recessed engaging portion 143 engages with the housing engaging portion 193, the first flat surface 193a comes into contact with the third flat surface 143a, restricting rotation of the stator 130 in the first direction relative to the housing 190. When the recessed engaging portion 143 engages with the housing engaging portion 193, the second flat surface 193b comes into contact with the fourth flat surface 143b, restricting rotation of the stator 130 in the second direction relative to the housing 190.

[0093] The four pairs of restricting members 194 are arranged at positions overlapping the housing engaging portions 193 in the axial direction. Each of the pair of restricting members 194 is a plate-shaped member and protrudes radially inward from an inner circumferential surface 198 of the housing 190. The four pairs of restricting members 194 restrict axial movement of the stator 130 relative to the housing 190. More specifically, one of the pair of restricting members 194 is arranged in front of the housing engaging portion 193 with a predetermined distance therebetween. This restricts forward movement of the stator 130 relative to the housing 190. The other of the pair of restricting members 194 is arranged behind the housing engaging portion 193 with a predetermined distance therebetween. This restricts rearward movement of the stator 130 relative to the housing 190.

[0094] In this embodiment, the concave motor electric working machine 1B corresponds to an example of a first type of working machine of the present disclosure, and the convex motor electric working machine 1A corresponds to an example of a second type of working machine of the present disclosure. The housing engaging portion 193 corresponds to an example of a first engaging portion and a housing convex portion of the present disclosure, and the concave engaging portion 143 corresponds to an example of a second engaging portion and a stator concave portion of the present disclosure. The housing engaging portions 921 and 931 correspond to an example of a third engaging portion of the present disclosure, and the convex engaging portion 43 corresponds to a fourth engaging portion and a stator convex portion of the present disclosure.

[0095] <1-3.Effects> According to the first embodiment described above in detail, the following effects are achieved. (1) The stator core 40 of the convex motor electric work machine 1A and the stator core 140 of the concave motor electric work machine 1B have a common inner shape 40A. This allows part of the production line for the convex motor electric work machine 1A and the concave motor electric work machine 1B to be shared, simplifying the production equipment.

[0096] (2) In the recessed motor electric work machine 1B, the recessed engagement portions 143 of the stator core 140 are disposed radially outward of the teeth 41. Therefore, an increase in the magnetic resistance of the stator core 140 due to the recesses formed on the outer peripheral surface 148 of the stator core 140 can be suppressed.

[0097] (3) In the recessed motor electric working machine 1B, the two surfaces of the recessed engaging portion 143 engage with the two surfaces of the housing engaging portion 193, thereby firmly fixing the circumferential position of the stator 130 relative to the housing 90.

[0098] (4) In the recessed motor electric working machine 1B, the stator 130 is provided with a plurality of fusing terminals 195 and a plurality of short-circuiting members 196, so that the six coils 34 can be easily connected in parallel.

[0099] (5) In the convex motor electric work machine 1A, the convex engagement portion 43 is arranged on the stator core 40, which reduces the axial height of the stator 30 and also prevents vibrations from being transmitted to the coil 34, thereby preventing breakage of the coil 34.

[0100] (6) In the recessed motor electric working machine 1B, the recessed engaging portion 143 is arranged in the stator core 140, which makes it possible to reduce the axial height of the stator 130 and also to prevent breakage of the coil 34.

[0101] (2. Second Embodiment) <2-1. Differences from the first embodiment> The second embodiment has the same basic configuration as the first embodiment, so differences will be described below. Note that the same reference numerals as those in the first embodiment indicate the same configuration, and reference will be made to the preceding description.

[0102] The work machine group according to the second embodiment includes a convex motor electric work machine 1C and a concave motor electric work machine 1B. The convex motor electric work machine 1C differs from the convex motor electric work machine 1A in that it has a motor unit 220 instead of the motor unit 20.

[0103] 15, motor unit 220 differs from motor unit 20 in that it includes a housing 290 instead of housing 90. Like motor unit 20, motor unit 220 includes a rotor 70, a stator 30, and a substrate 62, and six coils 34 are delta-connected in series.

[0104] <2-2. Motor with half housing, convex stator core, and series connection> <2-2-1. Fixing the stator> 16, housing 290 is a cylindrical body and is composed of a pair of half bodies 291A and 291B. Half body 291A constitutes the left half of housing 290, and half body 291B constitutes the right half of housing 290. Half body 291A is assembled to stator 30 from the left, and half body 291B is assembled to stator 30 from the right.

[0105] The housing 290 includes a square protrusion 292, a plurality of housing engagement portions 293, and a plurality of pairs of regulating members 294. The square protrusion 292 is formed by protruding in a square shape from the side surface of the housing 290. The power line 61 is housed in the square protrusion 292. The housing 290 includes the same number of housing engagement portions 293 as the convex engagement portions 43. In this embodiment, the plurality of housing engagement portions 293 includes four housing engagement portions 293. Furthermore, in this embodiment, the plurality of pairs of regulating members 294 includes four pairs of regulating members 294.

[0106] The four housing engaging portions 293 are arranged on an inner circumferential surface 298 of the housing 290 at positions facing the protruding engaging portions 43. Each of the housing engaging portions 293 protrudes radially inward from the inner circumferential surface 298 of the housing 290. When the half bodies 291A, 291B are assembled to the stator 30, the four protruding engaging portions 43 engage with the four housing engaging portions 293, respectively. This restricts rotation of the stator 30 in the first direction and the second direction relative to the housing 290. In other words, the circumferential position of the stator 30 is fixed relative to the housing 290.

[0107] 18, each of the housing engaging portions 293 has a first flat surface 293a and a second flat surface 293b. The second flat surface 293b is located closer to the first direction than the first flat surface 293a. The first flat surface 293a and the second flat surface 293b are inclined from the inner circumferential surface 298 of the housing 290 toward the tip of the housing engaging portion 293.

[0108] When the convex engaging portion 43 engages with the housing engaging portion 293, a first flat surface 293a of the housing engaging portion 293 comes into contact with a third flat surface 433 of the convex engaging portion 43, restricting rotation of the stator 30 in a first direction relative to the housing 290. Furthermore, when the convex engaging portion 43 engages with the housing engaging portion 293, a second flat surface 293b of the housing engaging portion 293 comes into contact with a fourth flat surface 434 of the convex engaging portion 43, restricting rotation of the stator 30 in a second direction relative to the housing 290.

[0109] The four pairs of restricting members 294 are arranged at positions overlapping the housing engaging portions 293 in the axial direction. Each of the pair of restricting members 294 is a plate-shaped member and protrudes radially inward from an inner circumferential surface 298 of the housing 290. The four pairs of restricting members 294 restrict axial movement of the stator 30 relative to the housing 290. More specifically, one of the pair of restricting members 294 is arranged in front of the housing engaging portion 293 with a predetermined distance from the housing engaging portion 293. This restricts forward movement of the stator 30 relative to the housing 290. The other of the pair of restricting members 194 is arranged behind the housing engaging portion 293 with a predetermined distance from the housing engaging portion 293. This restricts rearward movement of the stator 30 relative to the housing 290.

[0110] In this embodiment, the concave motor electric working machine 1B corresponds to an example of a first type of working machine of the present disclosure, and the convex motor electric working machine 1C corresponds to an example of a second type of working machine of the present disclosure. Furthermore, the housing engaging portion 193 corresponds to an example of a first engaging portion and a housing convex portion of the present disclosure, and the concave engaging portion 143 corresponds to an example of a second engaging portion and a stator concave portion of the present disclosure. Furthermore, the housing engaging portion 293 corresponds to an example of a third engaging portion of the present disclosure, and the convex engaging portion 43 corresponds to a fourth engaging portion and a stator convex portion of the present disclosure.

[0111] <2-3. Effects> According to the second embodiment described above in detail, the same effects as the effects (1) to (6) of the first embodiment described above can be achieved.

[0112] (3. Third Embodiment) <3-1. Differences from the first embodiment> The third embodiment has the same basic configuration as the first embodiment, and therefore differences will be described below. The same reference numerals as those in the second embodiment indicate the same configuration, and reference will be made to the preceding description.

[0113] The work machine group according to the third embodiment includes a convex motor electric work machine 1D and a concave motor electric work machine 1B. The convex motor electric work machine 1D differs from the convex motor electric work machine 1A in that it has a motor unit 320 instead of the motor unit 20.

[0114] 19, the motor unit 220 differs from the convex motor electric work machine 1A in that it has a housing 290 instead of the housing 90, a stator 230 instead of the stator 30, and a board 162 instead of the board 62. The motor unit 220 has the same rotor 70 as the motor unit 20.

[0115] <3-2. Motor with half housing, convex stator core, and parallel connection> <3-2-1. Fixing the stator> Stator 230 includes stator core 40, a pair of U-phase fusing terminals 195U, a pair of V-phase fusing terminals 195V, a pair of W-phase fusing terminals 195W, a U-phase short-circuit member 196U, a V-phase short-circuit member 196V, and a W-phase short-circuit member 196W. Similar to stator 130, stator 230 has six coils 34 delta-connected in two parallel configurations. That is, stator 230 differs from stator 130 in that stator core 40 is included instead of stator core 140.

[0116] As in the second embodiment, when the half bodies 291A, 291B are assembled to the stator 130, the four convex engaging portions 43 engage with the four housing engaging portions 293, respectively. This restricts rotation of the stator 230 in the first direction and the second direction relative to the housing 290. Furthermore, four pairs of restricting members 294 restrict axial movement of the stator 230 relative to the housing 290.

[0117] In this embodiment, the recessed motor electric working machine 1B corresponds to an example of a first type of working machine of the present disclosure, and the protruding motor electric working machine 1D corresponds to an example of a second type of working machine of the present disclosure. Furthermore, the housing engaging portion 193 corresponds to an example of a first engaging portion and a housing protruding portion of the present disclosure, and the recessed engaging portion 143 corresponds to an example of a second engaging portion and a stator recessed portion of the present disclosure. Furthermore, the housing engaging portion 293 corresponds to an example of a third engaging portion of the present disclosure, and the protruding engaging portion 43 corresponds to a fourth engaging portion and a stator protruding portion of the present disclosure.

[0118] <3-3.Effects> According to the third embodiment described above in detail, the same effects as the effects (1) to (6) of the first embodiment described above can be achieved.

[0119] (4. Fourth Embodiment) <4-1. Differences from the first embodiment> The fourth embodiment has the same basic configuration as the first embodiment, so differences will be described below. The same reference numerals as those in the first embodiment indicate the same configuration, and reference will be made to the preceding description.

[0120] The work machine group according to the fourth embodiment includes a convex motor electric work machine 1E and a concave motor electric work machine 1B. The convex motor electric work machine 1E differs from the convex motor electric work machine 1A in that it has a motor unit 420 instead of the motor unit 20.

[0121] 20B, motor unit 420 differs from motor unit 20 in that it includes stator 230 instead of stator 30 and includes substrate 162 instead of substrate 62. Like motor unit 20, motor unit 420 includes rotor 70 and housing 90.

[0122] <4-2. Cylindrical housing, convex stator core, parallel-connected motor> <4-2-1. Fixing the stator> As shown in FIG. 20A , similarly to the first embodiment, when the stator 230 is accommodated in the housing 90, the stator 230 is screwed to the housing 90 with screws 94 via a baffle plate 98. The screws 94 do not contact the stator 230. FIG. 20B is a view from FIG. 20A without the baffle plate 98. By screwing the stator 230 to the housing 90 with the screws 94 via the baffle plate 98, the axial position of the stator 230 with respect to the housing 90 is fixed. Furthermore, when the stator 230 is accommodated in the housing 90, one convex engaging portion 43 engages with the housing engaging portion 921, and another convex engaging portion 43 engages with the housing engaging portion 931. This fixes the circumferential position of the stator 230 with respect to the housing 90.

[0123] In this embodiment, the recessed motor electric working machine 1B corresponds to an example of a first type of working machine of the present disclosure, and the protruding motor electric working machine 1E corresponds to an example of a second type of working machine of the present disclosure. The housing engaging portion 193 corresponds to an example of a first engaging portion and a housing protruding portion of the present disclosure, and the recessed engaging portion 143 corresponds to an example of a second engaging portion and a stator recessed portion of the present disclosure. The housing engaging portions 921 and 931 correspond to an example of a third engaging portion of the present disclosure, and the protruding engaging portion 43 corresponds to a fourth engaging portion and a stator protruding portion of the present disclosure.

[0124] <4-3.Effects> According to the fourth embodiment described above in detail, the same effects as the effects (1) to (6) of the first embodiment described above can be achieved.

[0125] (5. Fifth Embodiment) <5-1. Differences from the First Embodiment> The fifth embodiment has the same basic configuration as the first embodiment, so differences will be described below. The same reference numerals as those in the first embodiment indicate the same configuration, and reference will be made to the preceding description.

[0126] The work machine group according to the fifth embodiment includes a convex motor electric work machine 1A and a recessed motor electric work machine 1F. The recessed motor electric work machine 1F differs from the recessed motor electric work machine 1B in that it has a motor unit 520 instead of the motor unit 120.

[0127] 21, motor unit 520 differs from motor unit 120 in that it includes a housing 390 instead of housing 190, and a stator 330 instead of stator 130. Stator 330 differs from stator 130 in that it includes a second insulator 152 instead of second insulator 52. Motor unit 520 includes a rotor 70, stator 330, and substrate 162, and six coils 34 are delta-connected in two parallel configurations.

[0128] <5-2. Cylindrical housing, concave stator core, parallel-connected motor> <5-2-1. Fixing the stator> 21 to 24, the fixing of the stator 330 to the housing 390 will be described. The housing 390 is a one-piece cylindrical body. The housing 390 has a square protrusion 392 and a plurality of semicircular protrusions 393. The square protrusion 392 is formed by a side surface of the housing 390 protruding downward in a square shape. The square protrusion 392 has a right side surface, a left side surface, and a bottom surface. The right side surface extends downward from the side surface of the housing 390. The left side surface extends downward from the side surface of the housing 390 and is located to the left of the right side surface. The bottom surface connects the right side surface and the left side surface. The square protrusion 392 houses the power line 61.

[0129] Each of the semicircular protrusions 393 is formed by a semicircular protrusion on the side surface of the housing 390 protruding radially outward. In this embodiment, the housing 390 has four semicircular protrusions 393. A screw 394 is inserted into each of the semicircular protrusions 393. The stator 330 is inserted through an opening in the housing 390, and then screwed to the housing 390 by the screw 394. This fixes the axial position of the stator 330 relative to the housing 390.

[0130] The rectangular protrusion 392 has two housing engagement portions 395. The two housing engagement portions 395 are plate-shaped members. One of the two housing engagement portions 395 extends leftward from the upper end of the right side surface of the rectangular protrusion 392. The other of the two housing engagement portions 395 extends rightward from the upper end of the left side surface of the rectangular protrusion 392. The left end of one of the two housing engagement portions 395 faces the right end of the other.

[0131] As shown in FIG. 22 , the second insulator 152 has protruding engagement portions 152a. The protruding engagement portions 152a have a rectangular shape and protrude radially outward from the outer circumferential surface of the second insulator 152. As shown in FIGS. 23 and 24 , when the stator 130 is accommodated in the housing 390, the protruding engagement portions 152a of the second insulator 152 abut against the two housing engagement portions 395. This fixes the circumferential position of the stator 330 relative to the housing 390. That is, in this embodiment, the housing engagement portions 395 engage with the protruding engagement portions 152a of the second insulator 152.

[0132] Engagement of protruding engagement portion 152a with right-side housing engagement portion 395 restricts rotation of stator 330 in the second direction relative to housing 390. Engagement of protruding engagement portion 152a with left-side housing engagement portion 395 restricts rotation of stator 330 in the first direction relative to housing 390.

[0133] In this embodiment, the recessed motor electric working machine 1F corresponds to an example of a first type of working machine of the present disclosure, and the protruding motor electric working machine 1A corresponds to an example of a second type of working machine of the present disclosure. Also, the housing engaging portion 395 corresponds to an example of a first engaging portion of the present disclosure, and the protruding engaging portion 152a of the second insulator 152 corresponds to an example of a second engaging portion of the present disclosure.

[0134] <5-3.Effects> According to the fifth embodiment described above in detail, the same effect as effect (4) of the first embodiment described above is achieved, and the following effect is also achieved. (7) In the recessed motor electric working machine 1F, the protruding engagement portions 152a of the second insulator 152 engage with the two housing engagement portions 395, thereby fixing the circumferential position of the stator 33 relative to the housing 390.

[0135] (6. Other Embodiments) Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments and can be implemented in various modified forms.

[0136] (a) The work group according to the fifth embodiment includes the convex motor electric work machine 1A and the recessed motor electric work machine 1F, but it may also include any of the convex motor electric work machines 1C, 1D, and 1E and the recessed motor electric work machine 1F. Furthermore, the convex motor electric work machines 1A, 1C, 1D, and 1E may correspond to an example of a first type of work machine of the present disclosure, and the recessed motor electric work machines 1B and 1F may correspond to an example of a second type of work machine of the present disclosure.

[0137] (b) In the above embodiment, the convex engaging portion 43 is formed integrally with the stator core 40. However, the convex engaging portion 43 may be formed separately from the stator core 40. Specifically, when the first insulator 51 and the second insulator 52 are fixed to the stator core 40 by integral molding, the convex engaging portion 43 may be formed integrally with the first insulator 51 or the second insulator 52 from a synthetic resin. When the convex engaging portion 43 is formed integrally with the first insulator 51, the convex engaging portion 43 is formed to extend rearward from the first insulator 51 and contact the outer peripheral surface 48 of the stator core 40. When the convex engaging portion 43 is formed integrally with the second insulator 52, the convex engaging portion 43 is formed to extend forward from the second insulator 52 and contact the outer peripheral surface 48 of the stator core 40.

[0138] (c) Multiple functions possessed by one component in the above embodiments may be realized by multiple components, or one function possessed by one component may be realized by multiple components. Also, multiple functions possessed by multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. Also, part of the configuration of the above embodiments may be omitted. Also, at least part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments. [Explanation of symbols]

[0139] 1A, 1C, 1D, 1E... Convex electric working machine, 1B, 1F, B... Concave electric working machine, 3... Battery pack, 15, 94, 394... Screw, 16... Shaft, 20, 120, 220, 320, 420, 520... Motor unit, 25... Motor, 30, 130, 230, 330... Stator, 34... Coil, 40, 140... Stator core, 40A... Inner shape, 40B, 140B... Outer Shape, 41...teeth, 43...convex engaging portion, 148...outer surface, 49, 198, 298...inner surface, 70...rotor, 90, 190, 290, 390...housing, 100...controller, 143...concave engaging portion, 191A, 191B, 291A, 291B...half body, 193, 293, 395, 921, 931...housing engaging portion, 195...fusing terminal, 196...short-circuit member.

Claims

1. An electric work machine corresponding to a first type work machine in a work machine group including a first type work machine and a second type work machine, The first type of work machine is a first brushless motor having a plurality of first coils and a first stator including an inner shape and a first outer shape; a controller configured to excite the first stator; a first housing configured to house the first brushless motor; the inner shape has a plurality of teeth having a predetermined shape and a predetermined inner diameter; The second type of work machine is a second brushless motor having a plurality of second coils and a second stator; a second housing configured to house the second brushless motor; the second stator has the inner shape common to the first brushless motor and a second outer shape different from the first outer shape; Electric work equipment.

2. the first housing has a first inner circumferential surface and a first engaging portion disposed on the first inner circumferential surface; the first outer shape has a first outer peripheral surface facing the first inner peripheral surface, and a second engagement portion disposed on the first outer peripheral surface and configured to engage with the first engagement portion; the second housing has a second inner circumferential surface and a third engaging portion disposed on the second inner circumferential surface and having a shape different from that of the first engaging portion; The second outer shape has a second outer peripheral surface facing the second inner peripheral surface, and a fourth engaging portion disposed on the second outer peripheral surface, the fourth engaging portion having a shape different from that of the second engaging portion, and configured to engage with the third engaging portion. The electric operating machine according to claim 1 .

3. the second engaging portion has a stator recess recessed radially inward from the first outer peripheral surface, the fourth engagement portion has a stator protrusion that protrudes radially outward beyond the first outer peripheral surface, The electric operating machine according to claim 2.

4. the stator recess is disposed outside at least one of the plurality of teeth in a radial direction of the first stator; The electric operating machine according to claim 3.

5. the first engaging portion has a housing protrusion that protrudes radially inward from the first inner circumferential surface, the housing protrusion has a first flat surface and a second flat surface, and a connection portion between the first flat surface and the second flat surface protrudes radially inward beyond the first inner circumferential surface, the stator recess has a third flat surface and a fourth flat surface, and a connection portion between the third flat surface and the fourth flat surface is recessed radially inward from the first outer peripheral surface, When the housing protrusion is engaged with the stator recess, the first flat surface contacts the third flat surface, and the second flat surface contacts the fourth flat surface. The electric operating machine according to claim 3.

6. the plurality of first coils are wound around the plurality of teeth in a parallel connection manner; The electric operating machine according to claim 3.

7. the first stator further includes a plurality of fusing terminals and a plurality of short-circuit members; two adjacent first coils among the plurality of first coils are connected via the fusing terminal, Each of the plurality of short-circuiting members connects fusing terminals corresponding to the same phase among the plurality of fusing terminals to each other. The electric operating machine according to claim 6.

8. the first stator includes a first stator core having the inner shape and the first outer shape; the second stator includes a second stator core having the inner shape and the second outer shape; The electric operating machine according to claim 1 or 2.

9. the second engaging portion has a stator protrusion that protrudes radially outward beyond the first outer circumferential surface, the fourth engagement portion has a stator recess recessed radially inward from the first outer peripheral surface, The electric operating machine according to claim 2.

10. An electric work machine corresponding to a first type work machine in a work machine group including a first type work machine and a second type work machine, The first type of work machine is a first brushless motor having a plurality of first coils wound in a parallel connection manner and a first stator including an inner shape and a first outer shape; a controller configured to excite the first stator; a first housing configured to house the first brushless motor; the inner shape has a plurality of teeth having a predetermined shape and a predetermined inner diameter; The second type of work machine is a second brushless motor having a plurality of second coils wound in series and a second stator; a second housing configured to house the second brushless motor; the second stator has the inner shape in common with the first brushless motor; Electric work equipment.

11. the second stator has a second outer shape different from the first outer shape. The electric operating machine according to claim 10.

12. the first stator is fixed to the first housing by screws in a direction of a rotation axis of the first brushless motor, the second stator is fixed to the second housing in the rotation axis direction of the second brushless motor without using screws; The electric operating machine according to claim 11.

13. the first housing includes a unitary cylinder; The second housing includes a pair of halves. The electric operating machine according to claim 12.

14. An electric work machine set including a first type electric work machine and a second type electric work machine, The first type electric working machine is a first brushless motor having a plurality of first coils and a first stator including an inner shape and a first outer shape; a controller configured to excite the first stator; a first housing configured to house the first brushless motor; the inner shape has a plurality of teeth having a predetermined shape and a predetermined inner diameter; The second type electric working machine is a second brushless motor having a plurality of second coils and a second stator; a second housing configured to house the second brushless motor; the second stator has the inner shape common to the first brushless motor and a second outer shape different from the first outer shape; Electric work machine set.

15. An electric work machine, a first brushless motor having a plurality of first coils and a first stator including an inner shape and an outer shape; a controller configured to excite the first stator; a first housing configured to house the first brushless motor; the inner shape has a plurality of teeth having a predetermined shape and a predetermined inner diameter; the inner shape is common to the inner shape of a second stator used in a second brushless motor of another electric working machine, the outer shape is different from the outer shape of the second stator; Electric work machine.

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