Electric work machine

Abstract

To provide an electric working machine equipped with an outer rotor type motor in which a stator is simply and appropriately fixed to a stator base. [Solution] One aspect of the present disclosure provides an electric work machine including an outer rotor brushless motor. The brushless motor includes a rotor, a stator, a stator support, a first fixing part, and a second fixing part. The stator includes a stator core having a through hole. The stator support includes a cylindrical body inserted into the through hole. The first fixing part restricts rotational movement of the stator core relative to the cylindrical body without using screws. The second fixing part is provided separately from the first fixing part and restricts movement of the stator core relative to the cylindrical body in a direction away from the cylindrical body without using screws.

Description

[Technical Field]

[0001] The present disclosure relates to an electric work machine equipped with an outer rotor type motor. [Background technology]

[0002] Patent Document 1 discloses an outer rotor brushless motor. In this brushless motor, a stator is supported on an aluminum stator base. Specifically, a cylindrical stator core is inserted into the pipe portion of the stator base. The stator core is then fixed to the stator base with six screws. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-005814 Summary of the Invention [Problem to be solved by the invention]

[0004] It is desirable to be able to properly fix the stator to the stator base with a simpler configuration. An object of one aspect of the present disclosure is to provide an electric working machine including an outer rotor type motor in which a stator is simply and appropriately fixed to a stator base. [Means for solving the problem]

[0005] In this disclosure, terms such as "first," "second," etc. are intended only to distinguish elements from one another and are not intended to limit the order or number of elements. Thus, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. In addition, a first element may be included without a second element, and similarly, a second element may be included without a first element.

[0006] One aspect of the present disclosure provides an electric working machine including an outer rotor brushless motor and a power transmission unit. The power transmission unit transmits the rotational force of the brushless motor to the driven tool to drive the driven tool.

[0007] The brushless motor includes a rotor, a stator, a stator support, a first fixed portion, and a second fixed portion. The rotor includes a rotor core and a permanent magnet. The rotor core has a cylindrical shape. The permanent magnet is attached to the rotor core.

[0008] The stator includes a stator core and a coil. The stator core is disposed on the inner periphery of the rotor core and has a through hole. The coil is wound around the stator core. The stator support portion has a cylindrical body that is inserted into the through hole.

[0009] The first fixing portion restricts the rotational movement of the stator core relative to the cylindrical body without using screws. The second fixing portion is provided separately from the first fixing portion and restricts movement of the stator core relative to the cylindrical body in a direction away from the cylindrical body without using screws.

[0010] In the electric working machine configured as described above, the stator is supported by the stator support portion. Furthermore, the first fixing portion restricts the rotational movement of the stator core, and the second fixing portion restricts the stator core from coming off the cylindrical body. Therefore, the stator is supported by the stator support. It is possible to provide an electric working machine equipped with an outer rotor type brushless motor that is simply and appropriately fixed to the shaft. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a perspective view of an electric work machine according to an exemplary embodiment; [Figure 2] FIG. 2 is a first perspective view of a motor and a controller in an electric working machine. [Figure 3] FIG. 2 is a first exploded perspective view of the motor. [Figure 4] FIG. 2 is a second perspective view of the motor. [Figure 5] FIG. 2 is a second exploded perspective view of the motor. [Figure 6] 1 is a cross-sectional view of a motor taken along a plane perpendicular to the up-down direction and passing through a rotation axis AX. [Figure 7] FIG. [Figure 8] FIG. 2 is a side view of a rotor core to which magnets are fixed. [Figure 9] FIG. 2 is a side view of the rotor cup. [Figure 10] 3 is a cross-sectional view of the rotor taken along a plane passing through a yoke portion of a rotor cup and perpendicular to the left-right direction. FIG. [Figure 11] 5A to 5C are explanatory views schematically illustrating a part of the manufacturing process of the rotor. [Figure 12] 1 is an exploded perspective view of a stator base and a stator before a fixing step of fixing a stator core to the stator base (hereinafter referred to as "before the fixing step"); FIG. [Figure 13] FIG. 10 is a perspective view of the vicinity of the left end of the stator base before a fixing process. [Figure 14] FIG. [Figure 15] 10 is a perspective view of the stator base and the stator core immediately after the stator core is inserted into the stator base during a fixing process. FIG. [Figure 16] 10 is a side view of the stator base and the stator core immediately after the stator core is inserted into the stator base during the fixing process. FIG. [Figure 17] FIG. 10 is a perspective view of the stator base and the stator core after the fixing process is completed. [Figure 18] 10A to 10C are explanatory diagrams showing a method of forming a restricting member. [Figure 19] FIG. 10 is a perspective view of the vicinity of the left end of the stator base according to the second embodiment. [Figure 20] FIG. 11 is a perspective view of the vicinity of the left end of the stator base of the third embodiment. [Figure 21] FIG. 10 is a perspective view of a stator core according to a third embodiment. [Figure 22] FIG. 11 is a perspective view of the stator base and the stator core in a state where a fixing step is completed in the third embodiment. [Figure 23] FIG. 10 is a perspective view of a core / base unit according to a fourth embodiment. [Figure 24] FIG. 10 is a perspective view of a stator base according to a fourth embodiment. [Figure 25] FIG. 10 is a front view of a stator base according to a fourth embodiment. [Figure 26] FIG. 10 is a cross-sectional view of a core / base unit of a fourth embodiment, taken along a plane perpendicular to the front-rear direction and passing through a rotation axis AX. [Figure 27] FIG. 11 is a perspective view of a stator base and a stator core before being integrally molded in a fifth embodiment. [Figure 28] FIG. 10 is a perspective view of a core / base unit according to a fifth embodiment. [Figure 29] FIG. 10 is a cross-sectional view of the core / base unit of the fifth embodiment, taken along a plane perpendicular to the front-rear direction and passing through the rotation axis AX. DETAILED DESCRIPTION OF THE INVENTION

[0012] [1. Overview of the embodiment] An embodiment may provide an electric power tool including at least one of the following: Feature 1: Outer rotor brushless motor. ·Feature 2: Power transmission unit. Feature 3: The power transmission unit transmits the rotational force of the brushless motor to the driven tool. The device is configured to drive the instrument. · Feature 4: Brushless motors have a rotor. Feature 5: The rotor includes a rotor core. Feature 6: The rotor core has a cylindrical shape. Feature 7: The rotor has a permanent magnet. Feature 8: Permanent magnets are attached to the rotor core. · Feature 9: The brushless motor has a stator. Feature 10: The stator has a stator core. Feature 11: The stator core is disposed on the inner periphery of the rotor core. Feature 12: The stator core has a through hole. Feature 13: The stator has a coil. Feature 14: The coil is wound around the stator core. Feature 15: The brushless motor includes a stator support. Feature 16: The stator support portion includes a cylindrical body. Feature 17: The cylindrical body is inserted into the through hole. The stator support portion may support the stator core by the cylindrical body. Feature 18: The brushless motor includes a first fixed portion. Feature 19: The first fixing portion restricts the rotational movement of the stator core relative to the cylindrical body without using screws. Feature 20: The brushless motor includes a second fixed portion. Feature 21: The second fixing portion is provided separately from the first fixing portion. Feature 22: The second fixing portion restricts the detachment of the stator core relative to the cylindrical body (or the detachment of the stator core from the cylindrical body) without using screws. Feature 23: The separation movement is a movement in a direction in which the stator core separates from the cylindrical body. This direction may also be referred to as the separation direction.

[0013] In an electric operating machine having at least Features 1 to 23, the rotational movement and separation movement of the stator core relative to the stator support part (specifically, relative to the cylindrical body) are regulated by the first fixing part and the second fixing part, making it possible to provide an electric operating machine equipped with an outer rotor type brushless motor in which the stator is simply and appropriately fixed to the stator support part.

[0014] The stator core may include a core back (or a yoke). The core back has a substantially cylindrical shape. The through-hole may be provided in the core back. The stator core may include a plurality of teeth. The plurality of teeth may extend radially from the outer periphery of the core back. A coil may be wound around each of the plurality of teeth. The core back and the plurality of teeth may be integrally formed from electromagnetic steel. The stator may include an insulator that at least partially covers the stator core and that covers at least portions of the teeth around which the coils are wound.

[0015] The rotational movement means that the stator core moves by rotation relative to the cylindrical body. The rotational movement may be simply referred to as rotation. The driven tool may be configured to perform work on a work target by being driven by the power transmission part.

[0016] Some embodiments may include the following in addition to or instead of at least one of features 1-23 above. Feature 24: The second fixing portion is provided at a distance from the first fixing portion.

[0017] In an electric working machine having at least the features 1 to 24, the steering is secured by the first and second fixing parts. The stator core can be appropriately fixed to the stator support. Some embodiments may include at least one of the following in addition to or instead of at least one of Features 1-24 above. Feature 25: The cylindrical body includes a protruding portion. Feature 26: The protruding portion protrudes from the through hole. Feature 27: The second fixing portion includes a restricting member. Feature 28: The restricting member is formed by partially plastically deforming the protruding portion. Feature 29: The restricting member abuts against the stator core.

[0018] In an electric operating machine having at least the features 1 to 23 and 25 to 29, the detachment movement of the stator core can be appropriately restricted with a simple configuration. The protruding portion may protrude from the through hole in the removal direction. The stator core may include an end face on the removal direction side. The restricting member may be formed by partially plastically deforming the protruding portion in the insertion direction. The insertion direction may be opposite to the removal direction. The restricting member may abut against the end face of the stator core.

[0019] Some embodiments may include the following in addition to or instead of at least one of features 1-29 above. Feature 30: The second fixing portion fixes the stator core to the cylindrical body by crimping.

[0020] In an electric operating machine having at least the features 1 to 23 and 30, the detachment movement of the stator core can be appropriately restricted with a simple configuration. Some embodiments may include at least one of the following in addition to or instead of at least one of Features 1-30 above. Feature 31: The first fixing portion includes a first key groove. Feature 32: The first key groove is provided on the outer peripheral surface of the cylindrical body. Feature 33: The first fixing part includes a key. Feature 34: The key is fitted into the first key groove. Feature 35: The first fixing portion includes a second key groove. Feature 36: The second key groove is provided on the inner peripheral surface of the through hole. Feature 37: The second keyway has a key inserted therein.

[0021] The keys may be in any form. Examples of keys may include sunken keys, half-moon keys, close-set keys, flat keys, slat keys, round keys, and sliding keys. Sunken keys may include parallel or angled key forms.

[0022] In an electric operating machine having at least the features 1 to 23 and 31 to 37, the rotational movement of the stator core can be appropriately restricted with a simple configuration. Some embodiments may include the following in addition to or instead of at least one of features 1-37 above. Feature 38: The key is press-fitted into the first keyway and / or the second keyway.

[0023] In an electric operating machine having at least the features 1 to 23 and 31 to 38, the rotational movement of the stator core can be more appropriately restricted. Some embodiments may include at least one of the following in addition to or instead of at least one of features 1-38 above. Feature 39: The first fixing portion has an inner peripheral protrusion. Feature 40: The inner peripheral protrusion is provided on the inner peripheral surface of the through hole. Feature 41: The first fixing portion has an outer circumferential groove. Feature 42: The outer circumferential groove is provided on the outer circumferential surface of the cylindrical body. Feature 43: An inner peripheral protrusion is inserted into the outer peripheral groove.

[0024] The inner peripheral protrusion may or may not be press-fitted into the outer peripheral groove. In an electric operating machine having at least the features 1 to 23 and 39 to 43, the rotational movement of the stator core can be appropriately restricted with a simple configuration.

[0025] Some embodiments may include the following in addition to or instead of at least one of features 1-43 above. Feature 44: The inner peripheral protrusion is integrally molded with the stator core.

[0026] In an electric operating machine having at least the features 1 to 23 and 39 to 44, the inner peripheral protrusion can be easily provided. Some embodiments may include at least one of the following in addition to or instead of at least one of Features 1-44 above. Feature 45: The first fixing portion has an outer peripheral protrusion. Feature 46: The outer peripheral protrusion is provided on the outer peripheral surface of the cylindrical body. Feature 47: The first fixing portion has an inner circumferential groove. Feature 48: The inner peripheral groove is provided on the inner peripheral surface of the through hole. Feature 49: An outer peripheral protrusion is inserted into the inner peripheral groove.

[0027] The outer peripheral protrusion may or may not be press-fitted into the inner peripheral groove. In an electric operating machine having at least the features 1 to 23 and 45 to 49, the rotational movement of the stator core can be appropriately restricted with a simple configuration.

[0028] Some embodiments may include the following in addition to or instead of at least one of features 1-49 above. Feature 50: The cylindrical body is integrally molded with the stator core. Feature 51: The first fixing portion includes an inner circumferential surface of the through hole. Feature 52: The first fixing portion includes an outer peripheral surface of the cylindrical body. Feature 53: The outer peripheral surface of the cylindrical body is fixed to the inner peripheral surface of the through hole by being integrally molded with the stator core of the cylindrical body.

[0029] In an electric operating machine having at least the features 1 to 23 and 50 to 53, the rotational movement of the stator core can be easily restricted, and the stator core can be easily fixed to the cylindrical body.

[0030] Some embodiments may include at least one of the following in addition to or instead of at least one of features 1-53 above. Feature 54: The cylindrical body is integrally molded by die-casting. Feature 55: Die-cast molding includes insert molding of the stator core.

[0031] In an electric operating machine having at least the features 1 to 23 and 50 to 55, the rotational movement of the stator core can be more easily restricted, and the stator core can be more easily fixed to the cylindrical body.

[0032] Some embodiments may include at least one of the following in addition to or instead of at least one of features 1 to 55 above. Feature 56: The second fixing portion includes a flange. Feature 57: The flange is provided on the cylindrical body. Feature 58: The flange protrudes from the through hole. Feature 59: The flange has an outer diameter larger than the inner diameter of the through hole.

[0033] The flange may protrude from the through hole in the aforementioned removal direction (i.e., the direction in which the stator core is removed from the cylindrical body). The flange may face and contact the end face of the stator core on the removal direction side.

[0034] In an electric operating machine having at least the features 1 to 23, 50 to 53, and 56 to 59, the detachment movement of the stator core can be easily and appropriately restricted. Some embodiments may include at least one of the following in addition to or instead of at least one of features 1-59 above. Feature 60: The stator core and the stator support portion are integrally molded via the resin portion. That is, the stator core, the stator support portion, and the resin portion are integrally formed. Feature 61: The first fixing portion includes an outer peripheral surface of the cylindrical body. Feature 62: The first fixing portion includes an inner circumferential surface of the through hole. Feature 63: The first fixing portion includes a first resin portion. Feature 64: The first resin portion is a part of the resin portion. Feature 65: The first resin portion is fixed to the inner peripheral surface of the through hole by being integrally molded with the stator core. Feature 66: The first resin portion is fixed to the outer peripheral surface of the cylindrical body by integral molding with the stator support portion.

[0035] In an electric operating machine having at least the features 1 to 23 and 60 to 66, the rotational movement of the stator core can be easily and appropriately restricted. Some embodiments may include the following in addition to or instead of at least one of features 1-66 above. Feature 67: A clearance filled with the first resin portion is provided between the outer peripheral surface of the cylindrical body and the inner peripheral surface of the through hole.

[0036] In an electric operating machine having at least the features 1 to 23 and 60 to 67, the rotational movement of the stator core can be tightly restricted. Some embodiments may include at least one of the following in addition to or instead of at least one of features 1-67 above. Feature 68: The second fixing portion includes a second resin portion. Feature 69: The second resin portion is a part of the resin portion. · Feature 70: The second resin portion is separate from the first resin portion. Feature 71: The second resin portion is fixed to the end face of the stator core in the direction of separation movement.

[0037] In an electric operating machine having at least the features 1 to 23, 60 to 66, and 68 to 71, the detachment movement of the stator core can be easily and appropriately restricted. Some embodiments may include at least one of the following in addition to or instead of at least one of Features 1 to 71 above. Feature 72: The cylindrical body (or the stator support portion) includes an aluminum alloy. Feature 73: The stator core includes electromagnetic steel.

[0038] In an electric working machine having at least the features 1 to 23, 72, and 73, it is possible to reduce the weight of the stator support portion (and thus the weight of the brushless motor). The cylindrical body (or the stator support portion) may contain any amount of aluminum alloy. The aluminum alloy may contain any amount of aluminum. The cylindrical body (or the stator support portion) may contain a metal (or a non-ferrous metal) different from the aluminum alloy. stomach.

[0039] Some embodiments may include at least one of the following in addition to or instead of at least one of features 1-73 above. Feature 74: The inner circumferential surface of the through hole has a first flat area. Feature 75: The outer peripheral surface of the cylindrical body has a second flat area facing the first flat area.

[0040] In an electric operating machine having at least the features 1 to 23, 74, and 75, the rotational movement of the stator core can be more firmly restricted. Some embodiments may include at least one of the following in addition to or instead of at least one of features 1-75 above. Feature 76: The rotor includes a rotor shaft. Feature 77: The rotor shaft passes through the inside of the cylinder. Feature 78: The rotor shaft is configured to rotate together with the rotor core. Feature 79: The electric work machine includes a bearing. Feature 80: The bearing is fixed inside the cylindrical body. Feature 81: The bearing rotatably supports the rotor shaft.

[0041] In an electric operating machine having at least Features 1 to 23 and 76 to 81, the rotor can be rotatably supported by utilizing the stator support portion, which allows for miniaturization of the brushless motor.

[0042] Embodiments including the above features 76-81 may further include at least one of the following: Feature 82: The bearing is fixed inside the cylindrical body on the insertion direction side of the restricting member. · Feature 83: The insertion direction is opposite to the withdrawal movement direction.

[0043] In an electric working machine having at least the features 1 to 23, 25 to 29, and 76 to 83, the brushless motor can be made smaller, and the rotor shaft can be stably supported. An embodiment may include a fastening portion that combines the functionality of the first fastening portion and the functionality of the second fastening portion, i.e., the fastening portion includes features 19 and 22 described above.

[0044] When an embodiment includes the above-described features 50 to 53, the first fixing portion can restrict the rotational movement of the stator core as well as the detachable movement of the stator core. In other words, the first fixing portion also has features 19 and 22. Therefore, in this case, the first fixing portion may be the fixing portion, and the second fixing portion may be omitted.

[0045] Even when an embodiment includes the above-described features 60 to 66, the first fixing portion can restrict the rotational movement of the stator core as well as the detachable movement of the stator core. That is, in this case, the first fixing portion also combines features 19 and 22. Therefore, in this case, the first fixing portion may also be the fixing portion, and the second fixing portion may be omitted.

[0046] Examples of the above-mentioned electric work 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, push carts, electrically assisted bicycles, and air pumps.

[0047] Examples of the power tools mentioned above are electric chainsaws, electric hand saws, electric blowers, electric hammers, etc. Includes 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 riveters), 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, electric cut-off saws, etc.

[0048] The above-mentioned examples of electric working machines may be in the form of battery-powered equipment configured to be powered by a battery. Specifically, the above-mentioned examples of electric working machines may have a built-in battery or may be configured to have a detachable battery pack attached. The battery pack houses the battery.

[0049] In some embodiments, the above features 1 to 83 may be combined in any manner. In some embodiments, any of the above features 1-83 may be omitted. 2. SPECIFIC EXEMPLARY EMBODIMENTS A specific exemplary embodiment will be described below. This specific exemplary embodiment provides an electric work machine 1 in the form of an electric chainsaw. However, this electric work machine 1 is merely an example, and the present disclosure may be applied to any form of electric work machine.

[0050] [2-1. First embodiment] [2-1-1. Overall configuration of electric work machine] As shown in Fig. 1, the electric work machine 1 includes a housing (or enclosure) 2. The housing 2 is made of synthetic resin. The housing 2 accommodates a motor 6 therein. The housing 2 accommodates a controller 11 therein.

[0051] For ease of explanation, in this embodiment, the directions of "up," "down," "right," "left," "front," and "rear" are defined with the electric working machine 1 at the center, as shown in Figure 1 and subsequent figures. The electric working machine 1 is provided with a guide bar 9. The guide bar 9 is a plate-shaped member. The guide bar 9 protrudes from the housing 2 to the front of the electric working machine 1.

[0052] The electric work machine 1 includes a saw chain 10. The saw chain 10 includes a plurality of cutters connected to one another. The saw chain 10 is removably attached to the periphery of a guide bar 9.

[0053] The electric work machine 1 includes a power transmission unit 13. The power transmission unit 13 is directly or indirectly connected to a rotor shaft 50 (see FIG. 2 ) of the motor 6. The saw chain 10 is connected to the motor 6 via the power transmission unit 13. The power transmission unit 13 includes a sprocket (not shown) configured to have the saw chain 10 attached thereto. The power transmission unit 13 transmits the rotation of the motor 6 (more specifically, the rotation of the rotor shaft 50) to the saw chain 10, thereby driving the saw chain 10.

[0054] Therefore, when the motor 6 is driven, the saw chain 10 moves around the periphery of the guide bar 9. When driven by the motor 6, the saw chain 10 can perform work on a work object. Specifically, the saw chain 10 can cut workpieces such as wood, metal, and resin.

[0055] The electric work machine 1 is provided with a battery mounting section 5. In this embodiment, the battery mounting section 5 protrudes upward from the rear of the housing 2. A battery pack 12 is removably mounted on the battery mounting section 5. The battery pack 12 is attached to the rear end face of the battery mounting section 5. The battery pack 12 includes a secondary battery, for example, a rechargeable lithium-ion battery. When the battery pack 12 is attached to the battery attachment section 5, it can supply power to the electric work machine 1. The motor 6 receives power from the battery pack 12 via the controller 11 and is driven by the power.

[0056] The electric working machine 1 is provided with a hand guard 4. The hand guard 4 protrudes upward from the front of the housing 2. The electric work machine 1 is provided with a side handle 3A and a top handle 3B behind the hand guard 4. One of the side handle 3A and the top handle 3B may be omitted. The side handle 3A and the top handle 3B are made of synthetic resin.

[0057] The side handle 3A is a pipe-shaped member that protrudes leftward from the left part of the housing 2. Therefore, the operator of the electric working machine 1 can grip the side handle 3A with his / her left hand from behind the electric working machine 1.

[0058] The top handle 3B protrudes upward from the top of the housing 2. The rear end of the top handle 3B is connected to the battery attachment section 5, which forms a space between the top handle 3B and the housing 2. Therefore, the operator can insert his or her fingers into this space to grip the top handle 3B.

[0059] The electric work machine 1 is provided with a trigger switch 7 below the top handle 3B. The trigger switch 7 is operated (for example, pulled) by the operator to drive the motor 6. When the trigger switch 7 is pulled upward by the operator, the motor 6 is driven. When the operation of the trigger switch 7 is released, the driving of the motor 6 is stopped.

[0060] The electric work machine 1 is provided with a trigger lock lever 8 above the top handle 3B. When the trigger lock lever 8 is pressed downward by the operator, operation of the trigger switch 7 is permitted.

[0061] The specific configuration of the motor 6 will be described below with reference to FIGS. [2-1-2. Specific motor configuration] In this embodiment, the motor 6 is in the form of an outer rotor brushless motor.

[0062] 2 to 6, the motor 6 includes a rotor 20. The motor 6 includes a stator 30. The rotor 20 is disposed on the outer periphery of the stator 30 and rotates around the stator 30 .

[0063] The motor 6 includes a rotor shaft 50. The rotor shaft 50 is fixed to the rotor 20. The central axis of the rotor shaft 50 coincides with the rotation axis AX of the motor 6. Therefore, the rotor 20 and the rotor shaft 50 rotate about the rotation axis AX.

[0064] The motor 6 includes a sensor board 60. The sensor board 60 includes three magnetic sensors 62 that detect the rotation of the rotor 20. The motor 6 includes a stator base 40. The stator base 40 supports the stator 30 and the sensor board 60.

[0065] The motor 6 includes an insulating member 70. The insulating member 70 is disposed between the stator base 40 and the stator 30. The insulating member 70 has a hollow disk shape. A second support portion 41B, which will be described later, is inserted into the inner hole of the insulating member 70 (see FIG. 6).

[0066] The rotor shaft 50 passes through the stator 30, the insulating member 70, and the stator base 40 from the rotor 20 and protrudes to the outside. The rotor shaft 50 is provided with an output shaft 51. The output shaft 51 corresponds to a part of the rotor shaft 50 that includes the first end protruding to the outside from the stator base 40. The output shaft 51 is directly or indirectly connected to the power transmission unit 13. The rotor shaft 50 drives the saw chain 10 via the power transmission unit 13.

[0067] The main components of the motor 6, including the rotor 20, the stator 30, and the stator base 40, will be described in more detail below with reference to FIGS. [2-1-2(a). Rotor] The configuration of the rotor 20 will be specifically described with reference to FIGS.

[0068] First, the basic configuration of the rotor 20 will be roughly described with reference to Figures 2 to 6. The rotor 20 includes a rotor cup 21. The rotor cup 21 is made of metal. Specifically, the rotor cup 21 contains aluminum, which is a non-magnetic material, as its main component.

[0069] The rotor cup 21 includes a plate portion 21A. The plate portion 21A has an annular shape. The plate portion 21A includes an opening 21C in its center. The rotor shaft 50 is inserted into the opening 21C and fixed therein. The rotor shaft 50 may be fixed to the rotor cup 21 by any method. In this embodiment, the rotor shaft 50 is press-fitted into the opening 21C and thereby fixed to the opening 21C (and thus to the rotor cup 21).

[0070] The rotor cup 21 includes a yoke portion 21B. The yoke portion 21B has a cylindrical shape. The yoke portion 21B surrounds the rotor shaft 50. The rotor cup 21 includes a plurality of fins 21D between the plate portion 21A and the yoke portion 21B. The yoke portion 21B is connected to the outer periphery of the plate portion 21A via the plurality of fins 21D. The plurality of fins 21D are arranged at equal intervals along the outer periphery of the plate portion 21A. The plurality of fins 21D rotate together with the plate portion 21A (in other words, the rotor 20), thereby generating wind. The wind cools the motor 6.

[0071] As shown in FIGS. 4 to 6, the rotor 20 includes a rotor core 22. The rotor core 22 includes a plurality of steel plates laminated in a direction along the rotation axis AX (hereinafter referred to as the "axial direction"). The rotor core 22 has a tubular shape. More specifically, the rotor core 22 has a substantially cylindrical shape. The rotor core 22 is supported on the inner circumferential surface of the yoke portion 21B of the rotor cup 21.

[0072] As shown in FIGS. 4 to 6, the rotor 20 includes a plurality of magnets 23. The plurality of magnets 23 are attached to the rotor core 22. Each of the plurality of magnets 23 is a permanent magnet. Each of the plurality of magnets 23 has a plate-like shape. In this embodiment, each of the plurality of magnets 23 is in the form of a sintered magnet. In this embodiment, the plurality of magnets 23 includes, for example, 12 magnets 23.

[0073] Next, the configuration of the rotor 20 will be described in more detail with reference to FIGS. As shown in Figures 7, 9, and 10, the yoke portion 21B of the rotor cup 21 has an inner peripheral surface 210 (hereinafter referred to as "cup inner peripheral surface 210"). The cup inner peripheral surface 210 has one or more recesses 211. In this embodiment, the cup inner peripheral surface 210 has a plurality of recesses 211 (for example, six recesses 211). The plurality of recesses 211 are arranged at intervals (for example, equal intervals) from one another along the circumferential direction. Each of the plurality of recesses 211 extends in the axial direction. It has a groove-like shape.

[0074] As shown in FIGS. 7 and 8, rotor core 22 has an outer peripheral surface 22A (hereinafter referred to as "core outer peripheral surface 22A") and an inner peripheral surface 22B (hereinafter referred to as "core inner peripheral surface 22B"). The core outer peripheral surface 22A has one or more outer peripheral protrusions 230. In this embodiment, the core outer peripheral surface 22A has a plurality of outer peripheral protrusions 230 (e.g., six outer peripheral protrusions 230). The plurality of outer peripheral protrusions 230 are arranged at intervals (e.g., equal intervals) from one another along the circumferential direction. Each of the plurality of outer peripheral protrusions 230 extends in the axial direction. Each of the plurality of outer peripheral protrusions 230 is inserted into a corresponding one of the plurality of recesses 211 of the rotor cup 21 (see FIG. 10).

[0075] The core outer peripheral surface 22A includes one or more first outer peripheral grooves 221 and one or more second outer peripheral grooves 222. In this embodiment, the core outer peripheral surface 22A includes a plurality of first outer peripheral grooves 221 (for example, 12 first outer peripheral grooves 221) and a plurality of second outer peripheral grooves 222 (for example, 6 second outer peripheral grooves 222).

[0076] The core outer peripheral surface 22A is divided into six unit areas. Each unit area corresponds to the area between two adjacent outer peripheral protrusions 230. Two first outer peripheral grooves 221 and one second outer peripheral groove 222 are provided in each unit area. In each unit area, one second outer peripheral groove 222 is located between two first outer peripheral grooves 221.

[0077] As shown in Figures 7, 8, 10, and 11, in the rotor 20, the multiple magnets 23 are fixed to the core inner peripheral surface 22B. In this embodiment, the multiple magnets 23 are adhesively fixed to the core inner peripheral surface 22B with an adhesive. The multiple magnets 23 are arranged at intervals from one another along the circumferential direction on the core inner peripheral surface 22B. As shown schematically in Figure 8, the multiple magnets 23 are arranged so that north and south poles alternate along the circumferential direction.

[0078] 10 , rotor core 22 is housed and fixed inside rotor cup 21. Specifically, rotor core 22 is disposed inside rotor cup 21 so that all (or most) of core outer peripheral surface 22A faces cup inner peripheral surface 210. Multiple outer peripheral protrusions 230 of rotor core 22 are inserted into multiple recesses 211 of rotor cup 21.

[0079] In this embodiment, rotor core 22 is adhesively fixed to rotor cup 21 with an adhesive. Specifically, adhesive 240 (see FIG. 10) is filled in a space (hereinafter referred to as a "filled space") generated between core outer peripheral surface 22A and cup inner peripheral surface 210.

[0080] The filling spaces exist between the entire core outer peripheral surface 22A and the cup inner peripheral surface 210. In other words, the adhesive 240 is applied over the entire circumference of the core outer peripheral surface 22A. Of the filling spaces, a larger amount of adhesive 240 is filled, particularly in the multiple first spaces, multiple second spaces, and multiple third spaces. The multiple first spaces are formed between the multiple first outer peripheral grooves 221 and the cup inner peripheral surface 210. The multiple second spaces are formed between the multiple second outer peripheral grooves 222 and the cup inner peripheral surface 210. The multiple third spaces are formed between the multiple recesses 211 and the multiple outer peripheral protrusions 230. In this embodiment, all of the first outer peripheral grooves 221, all of the second outer peripheral grooves 222, and all of the recesses 211 are filled with the adhesive 240.

[0081] 7, 8, 10, and 11, the core inner peripheral surface 22B has a plurality of inner peripheral grooves 225 (for example, 12 inner peripheral grooves 225). The magnets 23 are arranged at intervals (for example, equal intervals) from one another. More specifically, in this embodiment, one inner circumferential groove 225 is provided between two magnets 23 that are adjacent to one another in the circumferential direction. Each of the multiple inner circumferential grooves 225 has, for example, a substantially triangular cross section. Each of the multiple inner circumferential grooves 225 extends in the axial direction.

[0082] The multiple inner circumferential grooves 225 are used to support the rotor core 22 during the manufacturing process of the motor 6. As an example, during the manufacturing process of the motor 6, the rotor core 22 is supported by a support device 1500 shown in FIG. 11. The support device 1500 includes multiple support rods 1501. The multiple support rods 1501 are arranged in an arc shape. This allows the rotor core 22 to be supported by inserting the multiple support rods 1501 into the multiple inner circumferential grooves 225. The support device 1500 can move the multiple support rods 1501 in the circumferential direction. In other words, the support device 1500 can rotate the rotor core 22 via the multiple support rods 1501 and stop it at any position.

[0083] During the manufacturing process of the motor 6, various operations are performed on the rotor core 22 while the rotor core 22 is (i) supported by the support device 1500 and (ii) rotated as necessary. The various operations may include (i) applying adhesive 240 to the core outer peripheral surface 22A, (ii) applying adhesive to the core inner peripheral surface 22B, (iii) adhesively fixing the multiple magnets 23 to the core inner peripheral surface 22B, and (iv) adhesively fixing the rotor core 22 to the rotor cup 21.

[0084] [2-1-2(b). Stator] The stator 30 will be described in detail with reference to Figures 2 to 6, 12, and 14. The stator 30 is disposed on the inner circumferential side of the rotor core 22. That is, the stator 30 is disposed so as to face the plurality of magnets 23 in the radial direction. The radial direction is a direction perpendicular to the rotation axis AX.

[0085] The stator 30 includes a stator core 31. The stator core 31 is made of electromagnetic steel. The stator core 31 includes a plurality of steel plates stacked in the axial direction. As shown in FIGS. 12 and 14, the stator core 31 includes a first end face 301 and a second end face 302. The first end face 301 is an end face of the stator core 31 facing left, and the second end face 302 is an end face of the stator core 31 facing right.

[0086] As shown in detail in FIGS. 6, 12, and 14, the stator core 31 includes a yoke (or stator back) 31A. The yoke 31A has a cylindrical shape. Specifically, the yoke 31A includes a through hole 310. The stator base 40 is inserted into the through hole 310, and the rotor shaft 50 is inserted into the stator base 40. In other words, the rotor shaft 50 passes through the through hole 310 via the stator base 40. The central axis of the yoke 31A (i.e., the central axis of the through hole 310) coincides with the rotation axis AX.

[0087] 12 and 14, the through hole 310 of the stator core 31 has an opening 310A. A third support portion 41C (described later) of the stator base 40 and the rotor shaft 50 protrude leftward from this opening 310A. The through hole 310 has a stator inner peripheral surface 310B.

[0088] The stator inner peripheral surface 310B includes an inner peripheral flat area 311. The inner peripheral flat area 311 faces an outer peripheral flat area 413 of the stator base 40, which will be described later. 6, 12 and 14, the stator inner peripheral surface 310B is provided with a core-side key groove 312. Into the core-side key groove 312, a key 400, which will be described later, is inserted.

[0089] The stator core 31 includes a plurality of teeth 31B. The teeth 31B protrude radially from the outer peripheral surface of the yoke 31A. The teeth 31B are arranged at intervals along the circumferential direction. The teeth 31B are formed integrally with the yoke 31A. In this embodiment, the teeth 31B include nine teeth 31B. A slot is formed between two adjacent teeth 31B. In other words, the motor 6 of this embodiment is a 12-pole, 9-slot brushless motor.

[0090] The stator core 31 includes a plurality of coils 33. The plurality of coils 33 are wound around the plurality of teeth 31B, respectively. That is, in this embodiment, the plurality of coils 33 includes nine coils 33.

[0091] The stator 30 includes an insulator 32. The insulator 32 is made of, for example, synthetic resin. The insulator 32 is provided to insulate the electric circuits (particularly the above-mentioned plurality of coils 33) in the electric operating machine 1 from the stator core 31.

[0092] The insulator 32 covers at least a portion of the surface of the stator core 31. Specifically, the insulator 32 covers the entire yoke 31A except for the through hole 310, and the side surfaces of each of the multiple teeth 31B. This insulates the stator core 31 from the multiple coils 33 and the wiring, circuits, etc. electrically connected thereto. Note that, as shown in FIGS. 3 and 5 , the radial tip end portion of each of the multiple teeth 31B facing in the radial direction is exposed and not covered by the insulator 32. This allows the radial tip end portion to directly face the multiple magnets 23.

[0093] The insulator 32 may be provided in any manner on the stator core 31. For example, the insulator 32 may be divided into a plurality of parts, and the plurality of parts may be attached to the stator core 31.

[0094] Furthermore, for example, the insulator 32 may be integrally fixed to the stator core 31 by insert molding. Specifically, the stator core 31 and the insulator 32 may be formed as follows. First, the stator core 31 is placed in a mold. Next, molten synthetic resin is injected into the mold. Next, the synthetic resin in the mold is solidified. As a result, the insulator 32 is integrated (i.e., fixed) to the stator core 31.

[0095] [2-1-2(c). Bearings] The bearings will be described with reference to Figures 3 to 6. The motor 6 is equipped with a plurality of bearings. (i) The rotor shaft 50 passes through the plurality of bearings, and (ii) the bearings rotatably support the rotor shaft 50 (and thus the rotor 20).

[0096] In this embodiment, the plurality of bearings include a first bearing 54 (see FIGS. 5 and 6) and a second bearing 56 (see FIGS. 3, 5, and 6). The first bearing 54 is fitted into a third support portion 41C (see FIGS. 3, 5, and 6) of the stator base 40. The second bearing 56 is fitted into a first support portion 41A (see FIGS. 3 to 6) of the stator base 40, which will be described later.

[0097] In this embodiment, the first bearing 54 is in the form of a roller bearing (specifically a radial roller bearing, more specifically a needle roller bearing), and the second bearing 56 is in the form of a ball bearing (specifically a radial ball bearing).

[0098] 6, the rotor shaft 50 has a first surface 50A. The first surface 50A is a region of the surface of the rotor shaft 50 that comes into contact with the first bearing 54. The rotor shaft 50 further includes a second surface 50B. The second surface 50B corresponds to the area of ​​the surface of the rotor shaft 50 with which the second bearing 56 comes into contact.

[0099] In this embodiment, the axial length of the first surface 50A is longer than the axial length of the second surface 50B. However, the axial length of the first surface 50A may be shorter than or equal to the axial length of the second surface 50B.

[0100] [2-1-2(d). Stator base] The stator base 40 will be described with reference to Figs. 3 to 6, 12, and 13. The stator base 40 of this embodiment is made of aluminum. That is, the stator base 40 includes an aluminum alloy. In this embodiment, the stator base 40 is integrally formed from the aluminum alloy. The stator base 40 may be integrally formed by, for example, injection molding or die-casting.

[0101] 3 to 6 and 12, the stator base 40 includes a support portion 41. The support portion 41 (i) has a cylindrical shape and (i) has a plurality of steps along the rotation axis AX. The rotor shaft 50 passes through the support portion 41 in the axial direction.

[0102] More specifically, the support portion 41 includes a first support portion 41A, a second support portion 41B, and a third support portion 41C, all of which have a cylindrical shape. The first support portion 41A is connected to the second support portion 41B along the rotation axis AX. The second support portion 41B is connected to the third support portion 41C along the rotation axis AX. The outer diameter of the second support portion 41B is larger than the outer diameter of the third support portion 41C. The outer diameter of the first support portion 41A is larger than the outer diameter of the second support portion 41B.

[0103] The first support portion 41A has an inner diameter large enough to fit the second bearing 56. The second support portion 41B has an outer diameter large enough to fit into the hollow portion of the insulator 32 and larger than the inner diameter of the hollow portion of the stator core 31 (more specifically, the hollow portion of the yoke 31A). The third support portion 41C has an inner diameter large enough to fit the first bearing 54 and an outer diameter large enough to be inserted into the through hole 310 of the stator core 31.

[0104] 3 and 5 show a state in which the first and second bearings 54, 56 are inserted onto the rotor shaft 50. However, in reality, as will be described later, the first and second bearings 54, 56 are first fixed inside the stator base 40. Thereafter, the rotor shaft 50 is inserted into the stator base 40 and is thereby supported by the first and second bearings 54, 56.

[0105] 6, the support portion 41 is inserted into the through hole 310 of the stator core 31. More specifically, the third support portion 41C is inserted into the through hole 310. The first and second bearings 54, 56 may each be fixed in any manner to the stator base 40. In this embodiment, the first bearing 54 is press-fitted into the third support portion 41C, and the second bearing is press-fitted into the first support portion 41A.

[0106] However, the first bearing 54 may be fixed to the third support portion 41C by a method other than press-fitting. For example, the first bearing 54 may be fixed to the third support portion 41C by shrink fitting, cold fitting, or other methods. The same applies to the second bearing 56.

[0107] The first bearing 54 is disposed so as to at least partially overlap in the axial direction with the stator core 31 and the rotor core 22. The second bearing 56 does not overlap in the axial direction with the stator 31 and the rotor core 22.

[0108] When assembling the motor 6, the first bearing 54 and the second bearing 56 are fixed to the stator base 40. Thereafter, the rotor shaft 50 is inserted through the first bearing 54 and the second bearing 56 in this order, and is thereby supported by the stator base 40 (more specifically, supported by the first and second bearings 54, 56). Therefore, the output shaft 51 of the motor 6 is supported by the first support portion 41A so as to be rotatable around the rotation axis AX.

[0109] 12 and 13, the third support portion 41C of the stator base 40 includes a first cylindrical body 411 and a second cylindrical body 412. The first cylindrical body 411 is inserted into the through hole 310 of the stator core 31. An outer peripheral surface 411A of the first cylindrical body 411 faces the stator inner peripheral surface 310B (see FIG. 15). The stator inner peripheral surface 310B corresponds to the inner peripheral surface of the through hole 310. A left end portion of the second cylindrical body 412 faces the left end portion of the third support portion 41C. An outer peripheral surface 412A of the second cylindrical body 412 does not face the stator inner peripheral surface 310B and protrudes from the through hole 310 (see FIG. 15).

[0110] The outer diameter of the second cylindrical body 412 is smaller than the outer diameter of the first cylindrical body 411. In other words, the third support portion 41C is formed in a stepped shape along the axial direction. That is, a step exists between the first cylindrical body 411 and the second cylindrical body 412. In other words, the first cylindrical body 411 has a ring-shaped end face parallel to the radial direction at the boundary portion with the second cylindrical body 412.

[0111] The outer peripheral surface of the third support part 41C has an outer peripheral flat region 413. The outer peripheral surface of the third support part 41C is curved as a whole, but the outer peripheral flat region 413 is flat. The outer peripheral flat region 413 corresponds to a part of the outer peripheral surface 411A of the first cylindrical body 411 and also to a part of the outer peripheral surface 412A of the second cylindrical body 412.

[0112] The outer peripheral flat region 413 faces the inner peripheral flat region 311 of the stator inner peripheral surface 310B. In other words, the stator core 31 is fixed to the stator base 40 so that the inner peripheral flat region 311 faces the outer peripheral flat region 413 (see FIG. 15 ). This configuration can prevent the stator core 31 inserted into the stator base 40 from being displaced in the circumferential direction relative to the stator base 40.

[0113] The third support portion 41C has an inner peripheral surface 415. When the first bearing 54 is press-fitted into the third support portion 41C, the outer peripheral surface 54A of the first bearing 54 is pressed against the inner peripheral surface 415 of the third support portion 41C. This fixes the first bearing 54 to the third support portion 41C.

[0114] As shown in Figures 6, 12, and 13, the first cylindrical body 411 has a base-side key groove 411B on its outer circumferential surface 411A. A key 400 is fitted into the base-side key groove 411B (see Figures 3, 5, 6, 12, and 13). In this embodiment, the key 400 is in the form of a parallelepiped key and has a substantially rectangular parallelepiped shape. A parallel key is a type of sunken key.

[0115] A portion (for example, approximately half) of the key 400 is fitted into the base-side key groove 411B. Another portion of the key 400 is inserted into the core-side key groove 312 of the stator core 31. The key 400 may be fitted into the base-side key groove 411B in any manner. In this embodiment, the key 400 is press-fitted into the base-side key groove 411B. The key 400 may be inserted into the core-side key groove 312 in any manner. In this embodiment, the key 400 is press-fitted into the core-side key groove 312.

[0116] As shown in Figs. 3 to 6, the stator base 40 includes an attachment portion 42. The attachment portion 42 is integrally formed with the support portion 41. The attachment portion 42 includes an attachment portion main body 42A. The attachment portion main body 42A has a hollow disk shape. The attachment portion main body 42A is connected to the first support 41. It is provided on the outer periphery of the holding portion 41A.

[0117] The mounting portion 42 includes a first mounting portion 42B, a second mounting portion 42C, and a third mounting portion 42D. Any one or two of the first mounting portion 42B, the second mounting portion 42C, and the third mounting portion 42D may be omitted.

[0118] The first mounting portion 42B, the second mounting portion 42C, and the third mounting portion 42D each protrude radially outward from the mounting portion main body 42A. The first mounting portion 42B, the second mounting portion 42C, and the third mounting portion 42D each have a hole SH at their tip end. The tip end corresponds to the end opposite the mounting portion main body 42A. A screw (not shown) is inserted into each hole SH. Each screw is threaded into a threaded hole (not shown) provided on the inner surface of the housing 2, thereby fixing the mounting portion 42 (and therefore the motor 6) to the housing 2. Note that the mounting portion 42 may be indirectly attached to the housing 2. In other words, another object may be interposed between the mounting portion 42 and the housing 2.

[0119] A substrate fixing portion 42E is provided between the first mounting portion 42B and the second mounting portion 42C. The substrate fixing portion 42E fixes the sensor substrate 60. The substrate fixing portion 42E has a shape corresponding to the shape of the sensor substrate 60, specifically, an arc shape centered on the rotation axis AX.

[0120] 3 and 5, the substrate fixing portion 42E has a first hole 43 and a first pin 43A at a first end thereof. The first pin 43A is inserted into the first hole 43. Specifically, in this embodiment, the first pin 43A is press-fitted into the first hole 43.

[0121] The substrate fixing portion 42E has a second hole 44 and a second pin 44A at its second end. The second pin 44A is inserted into the second hole 44. Specifically, in this embodiment, the second pin 44A is press-fitted into the second hole 44.

[0122] The first pin 43A is inserted into a third hole 65 in the sensor substrate 60. The second pin 44A is inserted into a fourth hole 66 in the sensor substrate 60. FIG. 2 shows the first pin 43A inserted into the third hole 65. In this embodiment, the first pin 43A and the second pin 44A are loosely fitted into the third hole 65 and the fourth hole 66, respectively. The first pin 43A and the second pin 44A position the sensor substrate 60 at a specified position relative to the stator base 40 (and therefore relative to the stator 30).

[0123] [2-1-2(e). Sensor board] The sensor board 60 is equipped with three magnetic sensors 62 that detect the rotational position of the rotor 20. Each of the three magnetic sensors 62 detects a change in the magnetic field that accompanies the rotation of the rotor 20 and outputs a detection signal corresponding to the detected change. The sensor board 60 is supported on the stator base 40 so that each of the three magnetic sensors 62 mounted on the sensor board 60 faces a corresponding one of the multiple magnets 23 in the axial direction. The sensor board 60 is disposed radially outward of the multiple coils 33.

[0124] The sensor substrate 60 includes a connection terminal 64. The connection terminal 64 is electrically connected to the three magnetic sensors 62. The connection terminal 64 is further electrically connected to the controller 11 via wiring (not shown). The connection terminal 64 electrically connects the three magnetic sensors 62 to the controller 11. The sensor substrate 60 includes the third hole 65 and fourth hole 66 described above.

[0125] [2-1-3. Fixing the stator to the stator base] A method for fixing the stator core 31 to the stator base 40 will be described in more detail with reference to FIGS.

[0126] The stator core 31 may be fixed to the stator base 40 before the insulator 32 is integrally molded with the stator core 31 (i.e., the stator core 31 alone). Then, the insulator 32 and the multiple coils 33 may be attached to the stator core 31 in a state where the stator core 31 is fixed to the stator base 40.

[0127] Conversely, the stator core 31 with the insulator 32 integrally formed therewith, or the stator core 31 with the insulator 32 and the plurality of coils 33 attached thereto, may be attached to the stator base 40 .

[0128] In the following, as an example, it is assumed that the stator core 31 is first fixed to the stator base 40, and then the insulator 32 and the plurality of coils 33 are attached. The motor 6 of this embodiment includes at least one fixing portion for fixing the stator core 31 to the stator base 40. The at least one fixing portion does not include a screw. In other words, the at least one fixing portion restricts the detachment and rotational movement of the stator core 31 relative to the stator base 40 without using a screw.

[0129] Here, the axial direction includes the insertion direction and the removal direction. The insertion direction is the direction in which the stator core 31 moves relative to the third support portion 41C in order to insert the third support portion 41C into the through hole 310. In this embodiment, the insertion direction corresponds to the rightward direction. The removal direction is the opposite of the insertion direction. In other words, the removal direction is the direction in which the stator core 31 moves relative to the third support portion 41C in order to remove the third support portion 41C from the through hole 310. In this embodiment, the removal direction corresponds to the leftward direction.

[0130] The above-described separation movement of the stator core 31 relative to the third support portion 41C corresponds to movement in the separation direction. In this embodiment, the at least one fixing portion includes a first fixing portion 401 (see FIG. 12) and a second fixing portion 402 (see FIGS. 17 and 18).

[0131] The first fixing portion 401 includes the base-side key groove 411B of the stator base 40, the key 400, and the core-side key groove 312 of the stator core 31. The first fixing portion 401 restricts (or suppresses or prevents) rotational movement (i.e., rotation, in other words, movement in the circumferential direction) of the stator core 31 relative to the stator base 40.

[0132] The second fixing portion 402 includes a restricting member 420 (see FIGS. 17 and 18) described below. The second fixing portion 402 restricts (or suppresses or prevents) the detachment movement of the stator core 31 from the stator base 40. The detachment movement includes at least movement in the detachment direction.

[0133] 12 and 13, the restricting member 420 is not yet formed on the stator base 40 before the stator core 31 is inserted. The restricting member 420 is formed by a procedure described below after the stator core 31 is inserted into the stator base 40. The process of fixing the stator core 31 to the stator base 40 will be specifically described below.

[0134] The process of fixing the stator core 31 to the stator base 40 in the manufacturing process of the motor 6 will be described. First, the stator core 31 and the stator base 40 are prepared.

[0135] 15 and 16 , the third support portion 41C of the stator base 40 is inserted into the through-hole 310 of the stator core 31. In other words, the stator core 31 is moved in the insertion direction relative to the stator base 40, thereby inserting the third support portion 41C into the through-hole 310.

[0136] When the third support portion 41C is inserted into the through-hole 310, the portion of the key 400 that protrudes from the outer peripheral surface 411A of the first cylindrical body 411 (hereinafter referred to as the "key protrusion") is inserted into the core-side key groove 312. In other words, the stator core 31 is inserted into the stator base 40 so that the key protrusion is inserted into the core-side key groove 312. Furthermore, in this embodiment, as described above, the key protrusion is press-fit into the core-side key groove 312.

[0137] This allows the first fixing portion 401 to fix the stator core 31 to the stator base 40. That is, the first fixing portion 401 restricts the rotational movement of the stator core 31 relative to the stator base 40. As described above, the key 400 is press-fitted into the base-side key groove 411B and the core-side key groove 312. Therefore, the first fixing portion 401 can also contribute to restricting the detachment movement of the stator core 31.

[0138] When third support portion 41C is inserted into through-hole 310, a protruding portion is created. The protruding portion is an end portion of third support portion 41C that protrudes from through-hole 310 in the removal direction (see FIG. 15). The protruding portion includes a part of first cylindrical body 411 that includes the end portion of first cylindrical body 411, and second cylindrical body 412.

[0139] When the third support portion 41C is inserted into the through-hole 310, a restricting member 420 is formed as shown in Fig. 17. Specifically, the outer peripheral surface of the protruding portion of the third support portion 41C is plastically deformed (in other words, crimped) toward the stator core 31 so as to abut against the stator core 31. The crimped portion corresponds to the restricting member 420. In other words, the third support portion 41C fixes the stator core 31 by crimping.

[0140] 18 , the end of the first cylindrical body 411 is crimped toward the stator core 31 using, for example, a predetermined jig (not shown). That is, by applying local pressure to the end of the first cylindrical body 411 (for example, the end face described above), the end of the first cylindrical body 411 is plastically deformed until it abuts against the first end face 301 of the stator core 31. The restricting member 420 is formed by such plastic deformation. The restricting member 420 protrudes radially beyond the outer circumferential surface 411A of the first cylindrical body 411.

[0141] This allows the second fixing portion 402 to fix the stator core 31 to the stator base 40. In other words, the second fixing portion 402 restricts the stator core 31 from moving away from the stator base 40. The second fixing portion 402 may include any number of restricting members 420. In this embodiment, the second fixing portion 402 includes a plurality of restricting members 420 (see FIG. 17 ). The restricting members 420 also abut against the first end face 301 of the stator core 31. Therefore, the second fixing portion 402 can also contribute to restricting the rotational movement of the stator core 31.

[0142] The second end surface 302 of the stator core 31 abuts against the end surface of the second support portion 41B of the stator base 40. Therefore, more specifically, the stator core 31 is sandwiched between the end surface of the second support portion 41B and the plurality of restricting members 420 in the axial direction, thereby restricting movement in the axial direction.

[0143] The first bearing 54 is disposed further in the insertion direction (ie, to the right) than the plurality of restricting members 420. [2-1-4. Electrical configuration] Next, the electrical configuration of the electric operating machine 1 will be outlined. In this embodiment, the nine coils 33 are connected in a delta configuration. Specifically, the nine coils 33 include a first coil group, a second coil group, and a third coil group. The first coil group includes three of the nine coils 33, which are connected in parallel. The second coil group includes three of the nine coils 33 that are different from the first coil group, which are connected in parallel. The third coil group includes three of the nine coils 33 that are different from the first and second coil groups, which are connected in parallel. The first to third coil groups are connected in a delta configuration.

[0144] As shown in FIGS. 2 to 5, the motor 6 includes a lead group L. In this embodiment, the lead group L includes nine lead wires. Each of the nine lead wires is connected to one of the plurality of coils 33.

[0145] As shown in FIGS. 2 to 5, the motor 6 includes a first fusing terminal 35U, a second fusing terminal 35V, a third fusing terminal 35W, a first tube TBu, a second tube TBv, and a third tube TBw.

[0146] Of the nine lead wires, three corresponding to the U phase (hereinafter referred to as the "U-phase wiring group") are connected to the first fusing terminal 35U. Of the nine lead wires, three corresponding to the V phase (hereinafter referred to as the "V-phase wiring group") are connected to the second fusing terminal 35V. Of the nine lead wires, three corresponding to the W phase (hereinafter referred to as the "W-phase wiring group") are connected to the third fusing terminal 35W.

[0147] The U-phase wire group is bundled together and inserted into the first tube TBu corresponding to the U-phase, the V-phase wire group is bundled together and inserted into the second tube TBv corresponding to the V-phase, and the W-phase wire group is bundled together and inserted into the third tube TBw corresponding to the W-phase.

[0148] The first to third fusing terminals 35U, 35V, and 35W are electrically connected to the controller 11. The controller 11 receives battery power from the battery pack 12. The controller 11 converts the battery power into three-phase power based on detection signals from the three magnetic sensors 62 and other information. The controller 11 supplies the three-phase power to the motor 6 via the first to third fusing terminals 35U, 35V, and 35W. This drives the motor 6.

[0149] [2-1-5. Terminology] In the first embodiment, the first end face 301 (see FIG. 14) of the stator core 31 is an example of an end face in the overall embodiment. The base side key groove 411B is an example of a first key groove in the overall embodiment. The core side key groove 312 is an example of a second key groove and an inner circumferential groove in the overall embodiment. The inner circumferential flat area 311 is an example of a first flat area in the overall embodiment. The outer circumferential flat area 413 is an example of a second flat area in the overall embodiment.

[0150] In the fifth embodiment, the insulator 760 (particularly the core covering portion 761) is an example of a resin portion in the generalization of the embodiments. [2-2. Second embodiment] A stator base 450 of the second embodiment, partially shown in Fig. 19, is another form of the stator base 40 of the first embodiment. In Fig. 19, the same components as those of the stator base 40 of the first embodiment are denoted by the same reference numerals as those of the first embodiment.

[0151] The electric working machine of the second embodiment is obtained by replacing the stator base 40 in the electric working machine 1 of the first embodiment with a stator base 450 in Fig. 19. Therefore, the electric working machine of the second embodiment also includes a second fixing portion 402. The electric working machine of the second embodiment further includes a first fixing portion 441.

[0152] The stator base 450 includes a third support portion 451 corresponding to the third support portion 41C of the first embodiment. The third support portion 451 includes a first cylindrical body 452 and a second cylindrical body 412. The first cylindrical body 452 is provided with a base outer peripheral protrusion 453. The base outer peripheral protrusion 453 protrudes from an outer peripheral surface 452A of the first cylindrical body 452. The base outer peripheral protrusion 453 is a protrusion having a substantially rectangular parallelepiped shape and extends along the axial direction. In the second embodiment, the base outer peripheral protrusion 453 is integrally formed with the stator base 450. That is, assuming that the stator base 450 is integrally molded, the base outer peripheral protrusion 453 is also integrally formed.

[0153] The third support portion 451 is inserted into the through hole 310 of the stator core 31. At this time, the base outer peripheral protrusion 453 is inserted into the core side key groove 312 (see FIG. 14 ) of the through hole 310. In the second embodiment, the base outer peripheral protrusion 453 is inserted without being press-fitted into the core side key groove 312. However, the base outer peripheral protrusion 453 may be press-fitted into the core side key groove 312.

[0154] When the base outer peripheral protrusion 453 is inserted into the core side key groove 312 of the through hole 310, rotational movement of the stator core 31 relative to the first cylindrical body 452 is restricted. In other words, the electric operating machine of the second embodiment includes a first fixing portion 441 similar to the first fixing portion 401 of the first embodiment. The first fixing portion 441 includes the base outer peripheral protrusion 453 and the core side key groove 312 (see FIG. 14).

[0155] In the second embodiment, after the third support portion 451 is inserted into the through hole 310 of the stator core 31, one or more restricting members 420 (i.e., second fixing portions 402) are formed on the protruding portion of the third support portion 451, as in the first embodiment. Fig. 19 shows the stator base 450 before it is inserted into the through hole 410. In this state, the restricting members 420 have not yet been formed. Therefore, the restricting members 420 are shown by dashed lines in Fig. 19.

[0156] In the electric operating machine of the second embodiment, the base outer peripheral protrusion 453 and the core-side key groove 312 also appropriately restrict the rotational movement of the stator core 31 relative to the first cylindrical body 452. Furthermore, similar to the first embodiment, the second fixing portion 402 also restricts the detachable movement of the stator core 31.

[0157] In the second embodiment, the base outer peripheral protrusion 453 corresponds to an example of an outer peripheral protrusion in the summary of the embodiments, and the core side key groove 312 corresponds to an example of an inner peripheral groove in the summary of the embodiments.

[0158] [2-3. Third embodiment] A stator base 500 of the third embodiment partially shown in Fig. 20 is another form of the stator base 40 of the first embodiment. A stator core 350 of the third embodiment shown in Fig. 21 is another form of the stator core 31 of the first embodiment.

[0159] In Fig. 20, the same components as those in the stator base 40 of the first embodiment are denoted by the same reference numerals as those in the first embodiment. The same applies to the stator base 500 in Fig. 21. The electric working machine of the third embodiment is obtained by replacing the stator base 40 and the stator core 31 in the electric working machine 1 of the first embodiment with the stator base 500 in Fig. 20 and the stator core 350 in Fig. 21.

[0160] 20, the stator base 500 includes a third support portion 501 corresponding to the third support portion 41C of the first embodiment. The third support portion 501 includes a first cylindrical body 502 and a second cylindrical body 412.

[0161] A base outer circumferential groove 503 is provided on the outer circumferential surface 502A of the first cylindrical body 502. The base outer circumferential groove 503 extends along the axial direction. In the third embodiment, the base outer circumferential groove 503 is integrally formed with the stator base 500. That is, assuming that the stator base 500 is integrally molded, the base outer circumferential groove 503 is also integrally formed.

[0162] 21, the stator core 350 has a through hole 360 ​​corresponding to the through hole 310 of the first embodiment. The through hole 360 ​​has a stator inner peripheral surface 350B corresponding to the inner peripheral surface thereof.

[0163] In the third embodiment, a stator inner peripheral protrusion 351 is provided on the stator inner peripheral surface 350B. The stator inner peripheral protrusion 351 protrudes from the stator inner peripheral surface 350B. The stator inner peripheral protrusion 351 is a protrusion having a substantially rectangular parallelepiped shape and extends along the axial direction. In the third embodiment, the stator inner peripheral protrusion 351 is integrally formed with the stator core 350. That is, each of the multiple electromagnetic steel plates that make up the stator core 350 has a protrusion portion that corresponds to a part of the stator inner peripheral protrusion 351. The stator core 350 having the stator inner peripheral protrusion 351 is formed by stacking such multiple electromagnetic steel plates.

[0164] The third support portion 501 is inserted into the through hole 360 ​​of the stator core 350. At this time, as shown in FIG. 22 , the stator inner peripheral protrusion 351 is inserted into the base outer peripheral groove 503. In the third embodiment, the stator inner peripheral protrusion 351 is inserted without being press-fitted into the base outer peripheral groove 503. However, the stator inner peripheral protrusion 351 may be press-fitted into the base outer peripheral groove 503.

[0165] When the stator inner peripheral protrusion 351 is inserted into the base outer peripheral groove 503, rotational movement of the stator core 350 relative to the first cylindrical body 502 is restricted. In other words, the electric operating machine of the third embodiment also includes a first fixing portion 510 (see FIG. 22 ) similar to the first fixing portion 401 of the first embodiment. The first fixing portion 510 includes the stator inner peripheral protrusion 351 and the base outer peripheral groove 503.

[0166] As shown in Figure 22, in this third embodiment, after the third support portion 501 is inserted into the through hole 360 ​​of the stator core 350, one or more regulating members 420 (and thus one or more second fixing portions 402) are formed on the protruding portion of the third support portion 501, as in the first embodiment.

[0167] In the electric working machine of the third embodiment, the stator inner peripheral protrusion 351 and the base outer peripheral groove 503 also appropriately restrict the rotational movement of the stator core 350 relative to the first cylindrical body 502. Furthermore, as in the first embodiment, the second fixing portion 402 also restricts the detachable movement of the stator core 350.

[0168] In the third embodiment, the stator inner peripheral protrusion 351 corresponds to an example of an inner peripheral protrusion in the generalization of the embodiments, and the base outer peripheral groove 503 corresponds to an example of an outer peripheral groove in the generalization of the embodiments.

[0169] [2-4. Fourth embodiment] A core / base unit 600 of the fourth embodiment shown in Fig. 23 is another form of the stator core 31 and the stator base 40 of the first embodiment. The same components as the stator core 31 and the stator base 40 of the first embodiment are assigned the same reference numerals as in the first embodiment. The electric working machine of the fourth embodiment is obtained by replacing the stator core 31 and the stator base 40 in the electric working machine 1 of the first embodiment with a core / base unit 600 shown in Figure 23.

[0170] The core / base unit 600 includes a stator core 610 and a stator base 650. More specifically, the core / base unit 600 is an integrally molded product in which the stator core 610 and the stator base 650 are integrally molded.

[0171] The stator core 610 has a through hole 620 corresponding to the through hole 310 of the first embodiment. The through hole 620 has a stator inner peripheral surface 610B corresponding to the inner peripheral surface thereof. However, the stator inner peripheral surface 610B does not have the core-side key groove 312 of the first embodiment (see FIG. 14), nor does it have the stator inner peripheral protrusion 351 of the third embodiment (see FIG. 21). Like the stator core 31 of the first embodiment, this stator core 610 is formed by stacking a plurality of electromagnetic steel plates.

[0172] Stator base 650 is formed by die-casting an aluminum alloy. When stator base 650 is die-cast, stator core 610 is insert-molded.

[0173] Specifically, first, stator core 610 is set in a die for die-casting. The die is configured to form stator base 650. Next, molten aluminum alloy is injected into the mold at high pressure and speed. The aluminum alloy is then cooled and solidified. This forms stator base 650, and stator core 610 is integrated with stator base 650. In other words, core / base unit 600, in which stator core 610 and stator base 650 are integrated, is molded.

[0174] 24 to 26, the stator base 650 formed in this manner includes the first support portion 41A and the second support portion 41B as in the first embodiment, and also includes a third support portion 651 corresponding to the third support portion 41C of the first embodiment. The shape of this third support portion 651 is partially different from the third support portion 41C of the first embodiment.

[0175] The electric operating machine of the fourth embodiment also includes a first fixing portion 630 and a second fixing portion 640. The first fixing portion 630 restricts rotational movement of the stator core 610, and the second fixing portion 640 restricts detachable movement of the stator core 610. As will be described in detail later, the first fixing portion 630 includes a stator inner peripheral surface 610B and an outer peripheral surface 652A of the cylindrical body 652. The second fixing portion 640 includes a flange 653, which will be described later.

[0176] The third support part 651 of the fourth embodiment includes a cylindrical body 652 and the aforementioned flange 653. The cylindrical body 652 has basically the same shape and size as the first cylindrical body 411 of the first embodiment. However, the cylindrical body 652 does not include the base-side key groove 411B of the first embodiment. The outer peripheral surface 652A of the cylindrical body 652 is an entirely smooth curved surface except for a flat area 654. The flat area 654 corresponds to the area of ​​the outer peripheral flat area 413 of the first embodiment that is included in the first cylindrical body 411.

[0177] Flange 653 is formed at the end of cylindrical body 652 in the removal direction. As shown in FIGS. 24 to 26, flange 653 protrudes in the removal direction from through-hole 620 of stator core 610. The outer diameter of flange 653 is larger than the outer diameter of cylindrical body 652 and larger than the inner diameter of through-hole 620.

[0178] Therefore, flange 653 restricts stator core 610 from moving away from stator base 650. That is, second fixing portion 640 is formed by at least flange 653.

[0179] By die-casting including insert molding, outer peripheral surface 652A of cylindrical body 652 is fixed to inner peripheral stator surface 610B of stator core 610. This firmly fixes stator core 610 to stator base 650, and restricts rotational movement of stator core 610 relative to stator base 650.

[0180] That is, first fixed portion 630 is formed by at least stator inner peripheral surface 610B of stator core 610 and outer peripheral surface 652A of cylindrical body 652. First fixed portion 630 is formed by die-casting including insert molding. First fixed portion 630 restricts rotational movement of stator core 610 relative to stator base 650.

[0181] The essence of first fixing portion 630 is to fix stator inner peripheral surface 610B of stator core 610 to outer peripheral surface 652A of cylindrical body 652, which is formed by die-casting. Therefore, first fixing portion 630 can also contribute to restricting stator core 610 from moving apart.

[0182] [2-5. Fifth embodiment] The fifth embodiment illustrates a modified example of the core / base unit 600 of the fourth embodiment. In Figures 27 to 29, the same components as those of the first to fourth embodiments are assigned the same reference numerals as those of the first to fourth embodiments. The electric operating machine of the fifth embodiment is obtained by replacing the stator core 31, insulator 32, and stator base 40 of the electric operating machine 1 of the first embodiment with the core / base unit 600 of Figure 28.

[0183] In the fifth embodiment, as shown in Fig. 27, a stator base 700 and a stator core 610 are prepared. Then, the stator base 700 and the stator core 610 are integrally molded using resin, thereby forming a core / base unit 750 shown in Fig. 28. The resin is molded into an insulator 760. The core / base unit 750 is an integrally molded product in which the stator base 700 and the stator core 610 are integrally molded together with the insulator 760.

[0184] As shown in FIG. 27, the stator base 700 essentially corresponds to the stator base 40 of the first embodiment, with the base-side key groove 411B omitted and the outer diameter of the first cylindrical body 411 slightly shortened.

[0185] The stator base 700 includes a third support portion 701 corresponding to the third support portion 41C of the first embodiment. The third support portion 701 includes a first cylindrical body 711. The stator core 610 is the same as the stator core 610 of the fourth embodiment.

[0186] As described below, the core / base unit 600 is integrally molded by insert molding. First, the stator base 700 and the stator core 610 are set in a mold for insert molding. The mold is configured to form the insulator 760. At this time, the third support portion 701 of the stator base 700 is inserted into the through hole 620 of the stator core 610 in the same manner as in the finished product.

[0187] At this time, a clearance is generated between the outer peripheral surface 711A of the first cylindrical body 711 of the stator base 700 and the stator inner peripheral surface 610B of the stator core 610. In other words, the stator inner peripheral surface 610B does not come into contact with the outer peripheral surface 711A of the stator base 700. The inner peripheral surface 610B of the rotor may be in at least partial contact with the outer peripheral surface 711A of the stator base 700. In other words, it is not necessary to provide a clearance between them.

[0188] Next, molten resin is injected into the mold, and then cooled and solidified. The solidified resin corresponds to the insulator 760. The resin may be a thermoplastic resin or a thermosetting resin.

[0189] As a result, the stator base 700 and the stator core 610 are integrated together with the insulator 760, forming the core / base unit 600 (see FIGS. 28 and 29). 28 and 29, the insulator 760 covers most of the stator core 610 and a part of the stator base 700. The insulator 760 of the fifth embodiment has a function of integrating the stator base 700 and the stator core 610, in addition to a function of electrical insulation.

[0190] The insulator 760 includes a core covering portion 761 and a tooth covering portion 762. The tooth covering portion 762 covers the side surfaces of each of the plurality of teeth 31B. Core covering portion 761 has a substantially cylindrical shape and covers yoke 31A of stator core 610. Core covering portion 761 also covers most of second supporting portion 41B and third supporting portion 701 of stator base 700, as shown in FIG.

[0191] 29, the core covering portion 761 includes a first resin portion 7611. The first resin portion 7611 corresponds to the portion of the core covering portion 761 that is present within the above-mentioned clearance. In other words, the first resin portion 7611 is the resin that is filled in this clearance during the integral molding process and then solidified.

[0192] 28 and 29, core covering portion 761 further includes a second resin portion 7612. Second resin portion 7612 corresponds to a portion of core covering portion 761 that faces and is fixed to an end face of yoke 31A of stator core 610.

[0193] Core / base unit 750 formed in this manner includes a first fixing portion 770, as shown in Fig. 29. First fixing portion 770 restricts rotational movement of stator core 610. Core / base unit 750 further includes a second fixing portion 780, as shown in Figs. 28 and 29. Second fixing portion 780 restricts detachment movement of stator core 610.

[0194] 29, first fixed portion 770 includes first resin portion 7611, outer peripheral surface 711A of first cylindrical body 711, and stator inner peripheral surface 610B. First resin portion 7611 is fixed to outer peripheral surface 711A of first cylindrical body 711 and stator inner peripheral surface 610B by the above-mentioned integral molding. In other words, first resin portion 7611 has a first surface facing and fixed to outer peripheral surface 711A of first cylindrical body 711, and a second surface facing and fixed to stator inner peripheral surface 610B.

[0195] 28 and 29, second fixing portion 780 includes second resin portion 7612. Second resin portion 7612 faces and is fixed to an end face of yoke 31A of stator core 610 in the axial direction. Therefore, second resin portion 7612 restricts stator core 610 from moving away.

[0196] [2-6. Other embodiments] The present disclosure is not limited to the above-described embodiment, and can be implemented in various modifications. (1) In the first embodiment, where is the base-side key groove 411B provided on the first cylindrical body 411? The base-side key groove 411B may have any shape, axial length, circumferential length, and radial length (that is, depth).

[0197] The key 400 may be configured differently from a parallel key. The core-side key groove 312 may be formed in any range on the stator inner peripheral surface 310B, as long as at least the key 400 can be inserted therein. (2) In the second embodiment, the base outer peripheral protrusion 453 may be provided anywhere and in any number on the third support portion 451. The base outer peripheral protrusion 453 may have any shape, size, axial length, circumferential length, or radial length. (3) In the third embodiment, the stator inner peripheral protrusions 351 may be provided anywhere on the stator inner peripheral surface 350B, and any number of stator inner peripheral protrusions 351 may be provided. The stator inner peripheral protrusions 351 may have any shape, size, axial length, circumferential length, and radial length. (4) In the fifth embodiment, the core covering portion 761 may be formed anywhere and in any manner as long as the stator core 610 can be integrally fixed to the stator base 700 via the core covering portion 761 .

[0198] The resin portion for integrally fixing stator core 610 to stator base 700 may be provided separately from core covering portion 761 (that is, independent from insulator 760). (5) Instead of one or more recesses 211, a protrusion protruding from cup inner peripheral surface 210 may be provided on cup inner peripheral surface 210 of rotor cup 21. In this case, a recess into which the protrusion is inserted may be provided on core outer peripheral surface 22A of rotor core 22 at a position corresponding to the protrusion.

[0199] The recess 211 of the rotor cup 21 and the outer peripheral protrusion 230 of the rotor core 22 may be omitted. The core outer peripheral surface 22A of the rotor core 22 may have any number of outer peripheral grooves of any shape, and may be provided at any location.

[0200] A groove similar to the first outer circumferential groove 221 or the second outer circumferential groove 222 of the rotor core 22 may be provided on the cup inner circumferential surface 210 of the rotor cup 21. The groove may then be filled with adhesive 240. In this case, some or all of the first outer circumferential groove 221 and the second outer circumferential groove 222 of the rotor core 22 may be omitted. (6) In each of the above embodiments, the stator base may include a metal (or a non-ferrous metal) other than an aluminum alloy. (7) In the above embodiment, the first bearing 54 is a needle roller bearing. However, the first bearing 54 may be a bearing other than a needle roller bearing. The second bearing 56 may also be a bearing other than a ball bearing. (8) The motor 6 in the above embodiment is a brushless motor with 12 poles and 9 slots. However, the motor 6 may have any number of poles (i.e., magnets 23) and any number of teeth (i.e., slots). Furthermore, the multiple coils 33 may be connected to each other using any wiring method. (9) In each of the above embodiments, the electric working machine is in the form of an electric chainsaw. However, the electric working machine may be in a form other than an electric chainsaw. Specifically, the electric working machine may be in the form of any of the various types of equipment described above that are configured to be used at work sites such as construction, manufacturing, gardening, and civil engineering. (10) The electric operating machine of each of the above embodiments may be configured to be able to be driven by receiving AC power from an AC power source instead of or in addition to the battery pack 12.

[0201] [2-7. Supplementary Information] In the above embodiments, multiple functions achieved by one component may be achieved by multiple components, and one function achieved by one component may be achieved by multiple components. Furthermore, multiple functions achieved by multiple components may be achieved by one component, and one function achieved by multiple components may be achieved by one component. Furthermore, part of the configuration of the above embodiments may be omitted. Furthermore, at least part of the configuration of one of the above embodiments may be added to or substituted for the configuration of another of the above embodiments. [Explanation of symbols]

[0202] 1...electric work machine, 6...motor, 13...power transmission part, 20...rotor, 22...rotor core, 23...magnet, 30...stator, 31, 350, 610...stator core, 31A...yoke, 40, 450, 500, 650, 700...stator base, 41A...first support part, 41B...second support part, 41C, 451, 501, 651, 701...third support part, 50...rotor shaft, 310, 620...through hole, 310B, 350B, 610B...stator inner peripheral surface, 311...inner peripheral flat area, 312...core side keyway, 351...stator inner peripheral protrusion, 360...through hole Hole, 400...key, 401,441,510,630,770...first fixing portion, 402,640,780...second fixing portion, 411,452,502,711...first cylindrical body, 411A,412A,452A,502A,652A,711A...outer peripheral surface, 411B...base side key groove, 412...second cylindrical body, 413...outer peripheral flat area, 420...regulating member, 453...base outer peripheral protrusion, 503...base outer peripheral groove, 600,750...core / base unit, 652...cylindrical body, 653...flange, 761...core covering portion, 7611...first resin portion, 7612...second resin portion.

Claims

1. An outer rotor type brushless motor, a rotor having a cylindrical rotor core and a permanent magnet attached to the rotor core; a stator including a stator core disposed on an inner circumferential side of the rotor core and having a through hole, and a coil wound around the stator core; a stator support portion having a cylindrical body inserted into the through hole; a first fixing portion that restricts rotational movement of the stator core relative to the cylindrical body without using a screw; a second fixing portion that is separate from the first fixing portion and that restricts movement of the stator core relative to the cylindrical body in a direction away from the cylindrical body without using a screw; a brushless motor having a power transmission unit configured to transmit a rotational force of the brushless motor to a driven tool to drive the driven tool; An electric work machine equipped with:

2. The electric operating machine according to claim 1, The second fixing portion is provided at a distance from the first fixing portion.

3. The electric operating machine according to claim 1 or 2, the cylindrical body includes a protruding portion protruding from the through hole, the second fixing portion includes a restricting member formed by partially plastically deforming the protruding portion and abutting against the stator core. Electric work equipment.

4. The electric operating machine according to any one of claims 1 to 3, The second fixing portion fixes the stator core to the cylindrical body by crimping.

5. The electric operating machine according to any one of claims 1 to 4, The first fixing portion is a first key groove provided on an outer peripheral surface of the cylindrical body; a key fitted in the first keyway; a second key groove provided on an inner peripheral surface of the through hole and into which the key is inserted; An electric work machine equipped with:

6. The electric operating machine according to claim 5, The key is press-fitted into the first key groove and / or the second key groove. Electric work equipment.

7. The electric operating machine according to any one of claims 1 to 4, The first fixing portion is an inner peripheral protrusion provided on an inner peripheral surface of the through hole; an outer peripheral groove provided on the outer peripheral surface of the cylindrical body and into which the inner peripheral protrusion is inserted; An electric work machine equipped with:

8. The electric operating machine according to claim 7, The inner peripheral protrusion is integrally molded with the stator core. Electric work equipment.

9. The electric operating machine according to any one of claims 1 to 4, The first fixing portion is an outer circumferential protrusion provided on the outer circumferential surface of the cylindrical body; an inner peripheral groove provided on an inner peripheral surface of the through hole, into which the outer peripheral protrusion is inserted; An electric work machine equipped with:

10. The electric operating machine according to claim 1 or 2, the cylindrical body is integrally molded with the stator core, The first fixing portion is An inner circumferential surface of the through hole; an outer peripheral surface of the cylindrical body, the outer peripheral surface being fixed to the inner peripheral surface by integral molding with the stator core; Electric work machines, including

11. The electric operating machine according to claim 10, The cylindrical body is integrally formed by die-casting, The die-cast molding includes insert molding of the stator core. Electric work equipment.

12. The electric operating machine according to claim 10 or 11, The second fixing portion (i) is provided on the cylindrical body, (ii) protrudes from the through hole, and (iii) includes a flange having an outer diameter larger than an inner diameter of the through hole. Electric work equipment.

13. The electric operating machine according to claim 1 or 2, the stator core and the stator support portion are integrally molded via a resin portion, The first fixing portion is an outer peripheral surface of the cylindrical body; An inner circumferential surface of the through hole; a first resin portion that is a part of the resin portion and is fixed to an inner circumferential surface of the through hole by being integrally molded with the stator core, and is fixed to an outer circumferential surface of the cylindrical body by being integrally molded with the stator support portion; Electric work machines, including

14. The electric operating machine according to claim 13, a clearance filled with the first resin portion is provided between an outer peripheral surface of the cylindrical body and an inner peripheral surface of the through hole; Electric work equipment.

15. The electric operating machine according to claim 13 or 14, the second fixing portion is a part of the resin portion separate from the first resin portion and includes a second resin portion fixed to an end surface of the stator core on a side in a direction in which the stator core is separated from the cylindrical body. Electric work equipment.

16. An electric operating machine according to any one of claims 1 to 15, the cylindrical body includes an aluminum alloy, The stator core includes electromagnetic steel. Electric work equipment.

17. An electric operating machine according to any one of claims 1 to 16, an inner circumferential surface of the through hole has a first flat area; The outer peripheral surface of the cylindrical body has a second flat area facing the first flat area. Electric work equipment.

18. An electric operating machine according to any one of claims 1 to 17, the rotor includes a rotor shaft that passes through the cylindrical body and is configured to rotate together with the rotor core; The electric working machine includes a bearing fixed inside the cylindrical body and rotatably supporting the rotor shaft. Electric work equipment.

19. The electric operating machine according to claim 3, the rotor includes a rotor shaft that passes through the cylindrical body and is configured to rotate together with the rotor core; the electric operating machine includes a bearing fixed inside the cylindrical body on the insertion direction side of the restricting member and rotatably supporting the rotor shaft, and the insertion direction is opposite to the direction in which the stator core is removed from the cylindrical body. Electric work equipment.

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