Electric work machine

Abstract

Provided is an electric working machine equipped with a brushless motor, which can prevent an increase in size. [Solution] One aspect of the present disclosure is an electric work machine including a brushless motor. The brushless motor includes a rotor and a stator. The stator includes a stator core, a plurality of coils, and a conductive member. The stator core includes a yoke and a plurality of teeth. The plurality of coils are configured with wires wound around each of the plurality of teeth. The conductive member includes a connecting portion. The wire has a first end and a second end. The connecting portion of the conductive member includes a first connecting portion and a second connecting portion. The first connecting portion is connected to the first end. The second connecting portion is connected to the second end.

Description

[Technical Field]

[0001] The present disclosure relates to an electric work machine equipped with a brushless motor. [Background technology]

[0002] An electric working machine equipped with a brushless motor is known (Patent Document 1). The brushless motor includes a rotor and a stator. The rotor includes a magnet. The stator is disposed adjacent to the rotor. The stator includes a plurality of coils. The plurality of coils are configured with wires. The wires have a first end (starting end 116A) and a second end (terminating end 118A). The stator includes conductive conductive members (fusing terminals) connected to the first and second terminals of the wires.

[0003] The first and second terminals of the wires are connected to the same conductive member in a state where they are stacked along the axial direction of the rotor. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7242214 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the above-mentioned electric operating machine, the first and second terminals of the wire are stacked along the axial direction of the rotor, which may increase the size of the brushless motor in the axial direction, and thus may increase the size of the electric operating machine as the brushless motor becomes larger.

[0006] In response to this, users of electric working machines have been demanding that electric working machines be made smaller. Therefore, one aspect of the present disclosure is to provide an electric working machine that is equipped with a brushless motor and that can prevent an increase in size. [Means for solving the problem]

[0007] 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.

[0008] One aspect of the present disclosure provides an electric work machine including a brushless motor and a housing. The brushless motor includes a rotor and a stator. The rotor is configured to rotate around a rotation axis. The stator is disposed outside the rotor.

[0009] The housing is configured to house a brushless motor. The stator includes a stator core, an insulator, a plurality of coils, and a conductive member.

[0010] The stator core includes a yoke and a plurality of teeth. The yoke is arranged to surround the rotor. The yoke is annular. The plurality of teeth are configured to protrude radially inward from the yoke.

[0011] The insulator is configured to cover at least a portion of the stator core. The insulator has insulating properties. The plurality of coils are configured by including wires wound around the plurality of teeth, with insulators interposed therebetween.

[0012] The conductive member includes a connecting portion and a power receiving portion. The connecting portion is connected to the wire. The power receiving portion receives power for energizing the plurality of coils. The conductive member is electrically conductive. The wire has a first end and a second end.

[0013] The conductive member is disposed at a position where it is stacked on the yoke with the insulator interposed therebetween in the axial direction of the rotating shaft. The connection portion of the conductive member includes a first connection portion and a second connection portion. The first connection portion is connected to the first end portion. The second connection portion is connected to the second end portion.

[0014] With respect to the arrangement position in the circumferential direction along the annular shape of the yoke, the arrangement position of the first connecting portion is different from the arrangement position of the second connecting portion. With respect to the arrangement position in the axial direction, the arrangement position of the first connection portion is the same as the arrangement position of the second connection portion.

[0015] The first end and the second end are arranged so as to overlap the area where the coil is arranged when viewed from a direction perpendicular to the axial direction. In the brushless motor of such an electric operating machine, when connecting the wire to the conductive member (more specifically, the connection portion), it is not necessary to adopt a configuration in which the first end connected to the first connection portion and the second end connected to the second connection portion are stacked in the axial direction.As a result, the axial dimension of this brushless motor can be reduced compared to when connecting the wire to the conductive member by stacking the first end and the second end in the axial direction.

[0016] Therefore, this electric working machine is an electric working machine that is equipped with a brushless motor and can prevent its size from increasing. Furthermore, because the first and second ends of the electric operating machine are arranged to overlap the coil arrangement area, the first and second ends are prevented from being arranged outside the coil arrangement area in the axial direction, and therefore, with this electric operating machine, it is possible to prevent the brushless motor from increasing in size in the axial direction.

[0017] Another aspect of the present disclosure provides an electric working machine including a brushless motor and a housing. The brushless motor includes a rotor and a stator. The rotor is configured to rotate around a rotation axis. The stator is disposed outside the rotor.

[0018] The housing is configured to house a brushless motor. The stator includes a stator core, an insulator, a plurality of coils, and a conductive member.

[0019] The stator core includes a yoke and a plurality of teeth. The yoke is arranged to surround the rotor. The yoke is annular. The plurality of teeth are configured to protrude radially inward from the yoke.

[0020] The insulator is configured to cover at least a portion of the stator core. The insulator has insulating properties. The plurality of coils are configured by including wires wound around the plurality of teeth, with insulators interposed therebetween.

[0021] The conductive member includes a connecting portion and a power receiving portion. The connecting portion is connected to the wire. The power receiving portion receives power for energizing the plurality of coils. The conductive member is electrically conductive. The wire has a first end and a second end.

[0022] The conductive member is laminated on the insulator in a manner that the conductive member may or may not be in contact with the insulator, on a side of the insulator opposite to a side facing the stator core in the axial direction of the rotating shaft.

[0023] The connection portion of the conductive member includes a first connection portion and a second connection portion. The first connection portion is connected to the first end portion. The second connection portion is connected to the second end portion. With respect to the arrangement position in the circumferential direction along the annular shape of the yoke, the arrangement position of the first connecting portion is different from the arrangement position of the second connecting portion.

[0024] With respect to the arrangement position in the axial direction, the arrangement position of the first connection portion is the same as the arrangement position of the second connection portion. The first end and the second end are arranged so as to overlap the area where the coil is arranged when viewed from a direction perpendicular to the axial direction.

[0025] In the brushless motor of such an electric operating machine, when connecting the wire to the conductive member (more specifically, the connection portion), it is not necessary to adopt a configuration in which the first end connected to the first connection portion and the second end connected to the second connection portion are stacked in the axial direction.As a result, the axial dimension of this brushless motor can be reduced compared to when connecting the wire to the conductive member by stacking the first end and the second end in the axial direction.

[0026] Therefore, this electric working machine is an electric working machine that is equipped with a brushless motor and can prevent its size from increasing. Furthermore, because the first and second ends of the electric operating machine are arranged to overlap the coil arrangement area, the first and second ends are prevented from being arranged outside the coil arrangement area in the axial direction, and therefore, with this electric operating machine, it is possible to prevent the brushless motor from increasing in size in the axial direction.

[0027] Yet another aspect of the present disclosure provides a method for assembling the above-mentioned electric working machine. The method includes arranging a conductive member in a position in the axial direction of the rotating shaft where the conductive member is stacked on the yoke via an insulator.

[0028] The method includes disposing the first connection portion at a different position from the second connection portion in a circumferential direction along the annular portion of the yoke. The method includes disposing the first connecting portion at the same axial position as the second connecting portion.

[0029] The method includes connecting a first end to a first connecting portion, and connecting a second end to a second connecting portion. The method includes arranging the first end and the second end so as to overlap with an arrangement area of ​​the coil when viewed from a direction perpendicular to the axial direction.

[0030] An electric working machine assembled in this manner has the same effects as the electric working machine described above. [Brief explanation of the drawings]

[0031] [Figure 1] 1 is a diagram showing the appearance of an electric operating machine according to a first exemplary embodiment. [Figure 2] FIG. 2 is a first perspective view of a motor unit in the electric working machine of the first embodiment. [Figure 3] FIG. 2 is an exploded perspective view of the motor unit, corresponding to the first perspective view of the motor unit of the first embodiment. [Figure 4] FIG. 2 is an exploded perspective view of a stator, a rotor, a fan, and a substrate, corresponding to the first perspective view of the motor unit of the first embodiment. [Figure 5] FIG. 4 is a perspective view showing the inner structure of the left partial housing of the first embodiment. [Figure 6] FIG. 3 is a second perspective view of the motor unit in the electric working machine of the first embodiment. [Figure 7] FIG. 2 is an exploded perspective view of the motor unit, corresponding to the second perspective view of the motor unit of the first embodiment. [Figure 8] FIG. 2 is an exploded perspective view of a stator, a rotor, a fan, and a substrate, corresponding to the second perspective view of the motor unit of the first embodiment. [Figure 9]2 is an exploded perspective view of a first insulator, a stator core, a second insulator, and a conductive member, corresponding to the first perspective view of the motor unit of the first embodiment. FIG. [Figure 10] 2 is a perspective view showing a coil and a plurality of conductive members of the stator of the first embodiment. FIG. [Figure 11] 3 is an explanatory diagram of the W-phase conductor of the first embodiment, showing an enlarged view of a portion of the W-phase conductor provided with a fusing terminal. FIG. [Figure 12] 3 is an explanatory diagram of a coil and a plurality of conductive members of the stator of the first embodiment, viewed from the rear side. FIG. [Figure 13] 3 is an explanatory diagram schematically illustrating an electrical connection structure of a coil and a plurality of conductive members in the stator of the first embodiment. FIG. [Figure 14] 10 is an explanatory diagram of a coil and a plurality of conductive members of a stator according to a second embodiment, viewed from the rear side. FIG. [Figure 15] 10 is an explanatory diagram of a second W-phase conductor of a second embodiment, showing an enlarged view of a portion of the second W-phase conductor including a fusing terminal. FIG. [Figure 16] FIG. 10 is an explanatory diagram that schematically illustrates an electrical connection structure of a coil and a plurality of conductive members in a stator according to a second embodiment. [Figure 17] FIG. 11 is an explanatory diagram schematically illustrating the configuration of a coil and a plurality of conductive members of a stator according to a third embodiment, as viewed from the rear side. [Figure 18] Regarding the third conductive member of the third embodiment, (a) is an explanatory diagram showing the configuration of a third U-phase conductive member, (b) is an explanatory diagram showing the configuration of a third V-phase conductive member, and (c) is an explanatory diagram showing the configuration of a third W-phase conductive member. [Figure 19] FIG. 10 is an exploded explanatory view schematically illustrating a stacked state of third conductive members and insulating members according to a third embodiment. [Figure 20] FIG. 10 is an explanatory diagram that schematically illustrates an electrical connection structure of a coil and a plurality of conductive members in a stator according to a third embodiment. [Figure 21]FIG. 10 is an explanatory diagram schematically illustrating the configuration of a coil and a plurality of conductive members of a stator according to a fourth embodiment, as viewed from the rear side. [Figure 22] Regarding the fourth conductive member of the fourth embodiment, (a) is an explanatory diagram showing the configuration of a fourth U-phase conductive member, (b) is an explanatory diagram showing the configuration of a fourth V-phase conductive member, and (c) is an explanatory diagram showing the configuration of a fourth W-phase conductive member. [Figure 23] FIG. 10 is an exploded explanatory view schematically illustrating a stacked state of a fourth conductive member and an insulating member according to a fourth embodiment. [Figure 24] FIG. 10 is an explanatory diagram that schematically shows an electrical connection structure of a coil and a plurality of conductive members in a stator according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0032] [1. Overview of the embodiment] An embodiment may provide a power work machine (or power tool or power mechanical implement or field equipment) that includes at least one of the following:

[0033] Feature 1: Brushless motor. Feature 2: The brushless motor includes a rotor and a stator. · Feature 3: The rotor is configured to rotate around the rotation axis.

[0034] Feature 4: The stator is located outside the rotor. Feature 5: Housing. Feature 6: The housing is configured to accommodate a brushless motor.

[0035] Feature 7: The stator includes a stator core, an insulator, a plurality of coils, and a conductive member. Feature 8: The stator core includes a yoke and a plurality of teeth.

[0036] Feature 9: The yoke is arranged to surround the rotor. · Feature 10: The yoke is annular in shape. Feature 11: The teeth are configured to protrude radially inward from the yoke.

[0037] Feature 12: The insulator is configured to cover at least a portion of the stator core. ·Feature 13: The insulator is insulating.

[0038] Feature 14: The plurality of coils are configured by including wires wound around each of the plurality of teeth via insulators. Feature 15: The conductive portion includes a connection portion and a power receiving portion.

[0039] Feature 16: The connection part is connected to a wire. Feature 17: The power receiving unit receives power to energize the multiple coils. Feature 18: The conductive member is electrically conductive.

[0040] Feature 19: The wire has a first end and a second end. Feature 20: The conductive member is disposed in a position where it is stacked on the yoke via the insulator in the axial direction of the rotating shaft.

[0041] Feature 21: The connection portion of the conductive member includes a first connection portion and a second connection portion. Feature 22: The first connection portion is connected to the first end portion. Feature 23: The second connection portion is connected to the second end portion.

[0042] Feature 24: With respect to the arrangement position in the circumferential direction along the annular shape of the yoke, the arrangement position of the first connecting portion is different from the arrangement position of the second connecting portion. Feature 25: With respect to the arrangement position in the axial direction, the arrangement position of the first connection portion is the same as the arrangement position of the second connection portion.

[0043] Feature 26: The first end and the second end are arranged to overlap the coil arrangement area when viewed from a direction perpendicular to the axial direction. In an electric working machine having at least Features 1 to 26, the brushless motor does not need to be configured to axially stack the first end connected to the first connection part and the second end connected to the second connection part when connecting the wire to the conductive member (more specifically, the connection part).This allows the axial dimension of the brushless motor to be reduced compared to when the first end and the second end are axially stacked when connecting the wire to the conductive member.

[0044] Therefore, this electric working machine is an electric working machine that is equipped with a brushless motor and can prevent its size from increasing. Furthermore, because the first and second ends of the electric operating machine are arranged to overlap the coil arrangement area, the first and second ends are prevented from being arranged outside the coil arrangement area in the axial direction, and therefore, with this electric operating machine, it is possible to prevent the brushless motor from increasing in size in the axial direction.

[0045] Some embodiments may include at least one of the following in addition to or instead of at least one of features 1-29 above. Feature 27: The first connecting portion and the second connecting portion are each configured using a plate-like member.

[0046] Feature 28: The plate-shaped member is a member that is bent so that its cross section is U-shaped. Feature 29: The first connecting portion and the second connecting portion are each arranged such that a first extending direction connecting the open end and the closed end of the U-shape is parallel to the axial direction.

[0047] Feature 30: The first connection portion is connected to the first end portion with the first end portion disposed inside the U-shape. Feature 31: The second connection portion is connected to the second end portion with the second end portion disposed inside the U-shape.

[0048] An electric operating machine having at least Features 1 to 31 can prevent the axial dimensions of the first connecting portion and the second connecting portion from increasing, thereby preventing the axial dimension of the brushless motor from increasing.

[0049] Some embodiments may include at least one of the following in addition to or instead of at least one of Features 1 to 31 above. Feature 32: The first connection portion is arranged so that teeth are present between the first connection portion and the second connection portion in the circumferential direction along the annular shape of the yoke.

[0050] An electric operating machine having at least Features 1 to 32 can ensure a certain distance between the first connecting part and the second connecting part, thereby ensuring a certain distance between the connection work area between the first connecting part and the first end part and the connection work area between the second connecting part and the second end part, thereby reducing the complexity of each connection work.

[0051] Some embodiments may include at least one of the following in addition to or instead of at least one of Features 1-32 above. Feature 33: The first connection portion is disposed at a position where no teeth exist between the first connection portion and the second connection portion in the circumferential direction along the annular shape of the yoke.

[0052] In an electric operating machine having at least Features 1 to 33, the first connection portion and the second connection portion can be brought close to each other, and the wire can be laid so that the first end and the second end are positioned close to each other. This allows the same laying path for the wire as when the first end and the second end are connected to a single connection portion to be adopted, thereby reducing the workload of changing the laying path for the wire when changing the connection portion of the conductive member from one to two.

[0053] Some embodiments may include at least one of the following in addition to or instead of at least one of Features 1 to 33 above. Feature 34: The wires forming the multiple coils are composed of a single first wire.

[0054] An electric operating machine having at least Features 1 to 34 can prevent both ends of one first wire (in other words, the first end and second end of the first wire) from being stacked in the axial direction.

[0055] Some embodiments may include at least one of the following in addition to or instead of at least one of Features 1-34 above. Feature 35: The multiple coils are configured using two or more wires but fewer than the number of coils.

[0056] An electric working machine having at least features 1 to 35 can prevent both ends (in other words, the first end and the second end) of two or more wires, which is less than the number of coils, from being stacked in the axial direction.

[0057] Some embodiments may include at least one of the following in addition to or instead of at least one of Features 1 to 35 above. Feature 36: The rotor includes a rotation detection unit configured to detect the rotation state of the rotor.

[0058] Feature 37: The rotation detection unit is disposed on the opposite side of the stator core from the position where the conductive member is disposed in the axial direction. An electric operating machine having at least Features 1 to 37 can prevent interference between the conductive member and the rotation detector, and can prevent the brushless motor from increasing in size in the axial direction. In other words, this configuration has the conductive member, stator core, and rotation detector arranged in this order in the axial direction.

[0059] Some embodiments may include at least one of the following in addition to or instead of at least one of Features 1-37 above. Feature 38: The first connection portion and the second connection portion are arranged in a region overlapping with the stator core when viewed from the axial direction.

[0060] An electric operating machine having at least Features 1 to 38 can prevent the first and second connection parts from being disposed radially outward of the stator core, thereby preventing the brushless motor from increasing in size in a direction perpendicular to the axial direction (in other words, in the radial direction centered on the axis).

[0061] 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 conductive member is configured to electrically connect different coils among the plurality of coils.

[0062] An electric operating machine having at least the features 1 to 39 can omit crossover wires for electrically connecting different coils to each other. Some embodiments may include at least one of the following in addition to or instead of at least one of features 1-39 above.

[0063] Feature 40: The stator has a number of coils that is an integer multiple of three as the plurality of coils. An electric operating machine having at least the features 1 to 40 can be realized, for example, as a three-phase brushless motor having coils for U, V, and W phases.

[0064] Some embodiments may include at least one of the following in addition to or instead of at least one of Features 1-40 above. Feature 41: The rotor includes a rotor core and a plurality of permanent magnets fixed to the rotor core.

[0065] Feature 42: The number of poles, which indicates the number of the permanent magnets, is eight. Feature 43: The number of slots representing the number of coils is six. An electric operating machine having at least the features 1 to 43 can realize a brushless motor having six coils and eight permanent magnets.

[0066] In one embodiment, the electric power operating machine (or electric tool, or electric machine or field equipment) may be provided with features 44 to 45 instead of feature 20 among the features 1 to 26 described above.

[0067] Feature 44: The conductive member is laminated on the insulator in a manner that it is in contact with or not in contact with the insulator. Feature 45: The conductive member is laminated on the insulator on a side of the insulator opposite to a side facing the stator core in the axial direction of the rotating shaft.

[0068] An electric working machine having at least features 1 to 19, 21 to 26, 44, and 45 can reduce the dimensions in the axial direction of the brushless motor, similar to an electric working machine having features 1 to 26. Therefore, this electric working machine is an electric working machine that is equipped with a brushless motor and can prevent its size from increasing.

[0069] Furthermore, like the electric working machines having Features 1 to 26, this electric working machine can prevent the first end and the second end from being disposed outside the area in the axial direction where the coil is disposed, and therefore, with this electric working machine, it is possible to prevent the size of the brushless motor from increasing in the axial direction.

[0070] An embodiment may include at least one of Features 27 to 43 in addition to or instead of at least one of Features 1 to 19, 21 to 26, 44, and 45 described above.

[0071] An electric operating machine having at least Features 1 to 19, 21 to 31, 44, and 45 can prevent the axial dimensions of the first connecting portion and the second connecting portion from increasing, thereby preventing the axial dimension of the brushless motor from increasing.

[0072] An electric operating machine having at least Features 1 to 19, 21 to 32, 44, and 45 can ensure a certain distance between the first connecting part and the second connecting part, thereby ensuring a certain distance between the connection work area between the first connecting part and the first end and the connection work area between the second connecting part and the second end, and reducing the complexity of each connection work.

[0073] In an electric operating machine having at least Features 1 to 19, 21 to 33, 44, and 45, the first connection portion and the second connection portion can be brought close to each other, and the wire can be laid so that the first end and the second end are positioned close to each other. This allows the same laying path for the wire as when the first end and the second end are connected to a single connection portion to be adopted, thereby reducing the workload of changing the laying path for the wire when changing the connection portion of the conductive member from one to two.

[0074] An electric operating machine having at least the features 1 to 19, 21 to 34, 44, and 45 can prevent both ends of one first wire (in other words, the first end and second end of the first wire) from being stacked in the axial direction.

[0075] An electric working machine having at least features 1 to 19, 21 to 35, 44, and 45 can prevent both ends (in other words, the first end and the second end) of two or more wires that are fewer than the number of coils from being stacked in the axial direction.

[0076] An electric operating machine having at least Features 1 to 19, 21 to 37, 44, and 45 can prevent interference between the conductive member and the rotation detector, and can prevent the brushless motor from increasing in size in the axial direction. In other words, this configuration is such that the conductive member, stator core, and rotation detector are arranged in this order in the axial direction.

[0077] An electric operating machine having at least Features 1 to 19, 21 to 38, 44, and 45 can prevent the first and second connecting parts from being disposed radially outward of the stator core, thereby preventing the brushless motor from increasing in size in a direction perpendicular to the axial direction (in other words, in the radial direction about the axis).

[0078] An electric operating machine having at least the features 1 to 19, 21 to 39, 44, and 45 can omit crossover wires for electrically connecting different coils to each other. An embodiment may provide a method for assembling an electric power tool comprising at least one of the following:

[0079] Feature 46: The method is a method for assembling an electric work machine. Feature 47: The electric work machine has at least one of Features 1 to 26 above.

[0080] Feature 48: The conductive member is arranged in a position where it is stacked on the yoke via the insulator in the axial direction of the rotating shaft. Feature 49: The first connecting portion is disposed at a different position from the second connecting portion in the circumferential direction along the annular portion of the yoke.

[0081] Feature 50: The first connecting portion is disposed at the same position as the second connecting portion in the axial direction. ·Feature 51: Connecting the first end and the first connection portion.

[0082] ·Feature 52: Connecting the second end and the second connection portion. Feature 53: The first end and the second end are arranged so as to overlap with the coil arrangement area when viewed from a direction perpendicular to the axial direction.

[0083] An electric operating machine assembled by a method including at least the features 46 to 53 has the same effects as the electric operating machine described above. 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.

[0084] Examples of the power tools mentioned above include electric chainsaws, electric hand saws, electric blowers, electric hammers, electric hammer drills, electric drills, electric screwdrivers, electric wrenches, electric impact drivers, electric impact wrenches, electric grinders, electric circular saws, electric reciprocating saws, electric jigsaws, electric cutters, electric planers, electric nail guns (including tackers), electric hedge trimmers, electric lawn mowers, electric lawn clippers, electric brush cutters, electric cleaners, electric sprayers, electric spreaders, electric dust collectors, electric trowels, electric vibrators, electric rammers, electric compactors, electric pumps, electric pile drivers, electric concrete saws, electric screeds, and electric cut-off saws.

[0085] 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.

[0086] In some embodiments, the above features 1 to 53 may be combined in any manner. In some embodiments, any of the above features 1-53 may be omitted. 2. SPECIFIC EXEMPLARY EMBODIMENTS [2-1. First embodiment] A specific exemplary embodiment will be described below. This specific exemplary embodiment provides an electric work machine 1 in the form of an electric impact driver. This electric work machine 1 is merely an example, and the present disclosure may be applied to any form of electric work machine.

[0087] In the following description and drawings, for convenience of explanation, directions such as "up," "down," "front," "rear," "left," and "right" are defined as shown in Figures 1, 2, etc. However, these directions are used merely to facilitate easy understanding of the structure of the electric working machine 1 and are not intended to limit the orientation of the electric working machine 1. The electric working machine 1 can be oriented in any direction. [2-1-1. Overall configuration of electric work machine] As shown in Figure 1, the electric work machine 1 includes a head portion 10, a motor unit 20, a grip 5, a battery mounting portion 6, a chuck sleeve 7, and a trigger 8. The motor unit 20 is fixed to the rear end of the head portion 10. The motor unit 20 includes a motor 25 (described later) and a housing 90. The chuck sleeve 7 is provided at the front end of the head portion 10. The chuck sleeve 7 is configured to allow various tool bits to be detachably attached.

[0088] The grip 5 is provided below the head unit 10 and the motor unit 20, and extends in the vertical direction. The grip 5 is held by a user of the electric work machine 1. The battery attachment unit 6 is provided at the lower end of the grip 5. The battery attachment unit 6 is configured to allow the battery pack 3 to be detachably attached. The battery pack 3 includes multiple cells connected in series and is configured to be chargeable and dischargeable. The battery pack 3 is, for example, a lithium-ion battery.

[0089] The trigger 8 is provided on the upper front surface of the grip 5. The trigger 8 is configured to be manually operated by a user. Specifically, the electric work machine 1 is configured so that the motor 25 rotates in response to the user pulling the trigger 8, and the motor 25 stops in response to the user releasing the trigger 8.

[0090] The head portion 10 accommodates therein a power transmission portion 12. The power transmission portion 12 is disposed in front of the motor unit 20 and is mechanically connected to the motor 25. A chuck sleeve 7 is provided at the front end of the head portion 10. The chuck sleeve 7 is mechanically connected to a power transmission portion 12.

[0091] A driven tool 15 is removably attached to the chuck sleeve 7. In the first embodiment, the driven tool 15 is in the form of, for example, various tool bits. Examples of various tool bits include a driver bit, a socket bit, and a drill bit.

[0092] The power transmission unit 12 transmits the rotation of the motor 25 to the chuck sleeve 7. Therefore, when the motor 25 rotates, the chuck sleeve 7 rotates together with the driven tool 15 attached thereto. The power transmission unit 12 also includes an impact mechanism (not shown). When the magnitude of the load applied from the chuck sleeve 7 exceeds a predetermined level, the impact mechanism intermittently applies a rotational impact force to the chuck sleeve 7. The load is applied in the direction opposite to the rotational direction of the chuck sleeve 7. This impact mechanism realizes the characteristic functions of an impact driver.

[0093] The grip 5 includes a controller 100 inside its lower end. The controller 100 receives power from the battery pack 3 and starts up, and controls various functions of the electric work machine 1. For example, the controller 100 controls the drive current supplied to the motor 25 from the battery pack 3, thereby controlling the drive of the motor 25. [2-1-2. Motor unit configuration] The motor unit 20 provided in the electric operating machine 1 will be described with reference to FIGS.

[0094] As shown in Fig. 3, the motor unit 20 includes a motor 25, a fan 80, a substrate 62, and a housing 90. As shown in Fig. 4, the motor 25 includes a rotor 70 and a stator 30. The motor 25 is an inner rotor type motor. As shown in Figs. 3, 4, 7, and 8, the motor 25 includes a front bearing 25a and a rear bearing 25b. The front bearing 25a and the rear bearing 25b rotatably support the rotor 70.

[0095] The motor 25 of this embodiment is a three-phase brushless motor having 4m magnetic poles (m is a natural number) and 3m slots. As an example of such a combination of the number of poles (i.e., the number of magnetic poles) and the number of slots, this embodiment illustrates an eight-pole, six-slot three-phase brushless motor. The motor 25 of this embodiment has a U-phase, a V-phase, and a W-phase as its three phases.

[0096] Hereinafter, the direction parallel to the rotation axis AX of the motor 25 will be referred to as the axial direction. The axial direction coincides with the front-to-rear direction. The radial direction of the rotation axis AX will be referred to as the radial direction. In the radial direction, a position closer to or approaching the rotation axis AX will be referred to as the radially inner side, and a position farther from or away from the rotation axis AX will be referred to as the radially outer side. The direction revolving around the rotation axis AX will be referred to as the circumferential direction. Of the circumferential directions, the counterclockwise direction when facing forward will be referred to as the first direction, and the clockwise direction when facing forward will be referred to as the second direction. [2-1-3. Housing] 2 and 3, the housing 90 is configured to house the motor 25. The housing 90 is an electrically insulating member, and is made of a resin material (for example, synthetic resin).

[0097] As shown in Figures 2 and 6, the housing 90 includes a cylindrical portion 90a and a protruding portion 90b. The cylindrical portion 90a has a cylindrical shape that is open at the front and closed at the rear. The protruding portion 90b is formed to protrude downward from the bottom of the cylindrical portion 90a. The protruding portion 90b accommodates a power line 61, which will be described later.

[0098] As shown in Figures 2, 3, and 5 to 7, the housing 90 is configured to be separable into a right partial housing 91 and a left partial housing 92. The right partial housing 91 constitutes the right portion of the housing 90. The left partial housing 92 constitutes the left portion of the housing 90. The right partial housing 91 is assembled to the stator 30 of the motor 25 from the right side. The left partial housing 92 is assembled to the stator 30 of the motor 25 from the left side. The left partial housing 92 is disposed to face the right partial housing 91. The housing 90 is configured to accommodate the motor 25 between the right partial housing 91 and the left partial housing 92.

[0099] 3, the right partial housing 91 includes a first protrusion 91a and a second protrusion 91b. The first protrusion 91a is configured to protrude from the inner surface of the right partial housing 91 toward the motor 25. The right partial housing 91 includes two first protrusions 91a. The second protrusion 91b is configured to protrude toward the motor 25 from a position on the inner surface of the right partial housing 91 that is different from the first protrusion 91a in terms of circumferential position about the rotation axis AX.

[0100] 5, the left partial housing 92 includes a third protrusion 92a and a fourth protrusion 92b. The third protrusion 92a is configured to protrude from the inner surface of the left partial housing 92 toward the motor 25. The left partial housing 92 includes two third protrusions 92a. The fourth protrusion 92b is configured to protrude toward the motor 25 from a position on the inner surface of the left partial housing 92 that is different from the third protrusion 92a in the circumferential direction about the rotation axis AX.

[0101] When the right partial housing 91 and the left partial housing 92 are arranged to face each other, the first protrusion 91a of the right partial housing 91 and the third protrusion 92a of the left partial housing 92 are configured to face each other via the motor 25.

[0102] When the right partial housing 91 and the left partial housing 92 are arranged to face each other, the second protrusion 91b of the right partial housing 91 and the fourth protrusion 92b of the left partial housing 92 are configured to face each other via the motor 25.

[0103] 3, the right partial housing 91 includes fifth protrusions 91c. The fifth protrusions 91c are configured to protrude from the inner surface of the right partial housing 91 toward the motor 25. The right partial housing 91 includes two fifth protrusions 91c.

[0104] 5, the left partial housing 92 includes sixth protrusions 92c. The sixth protrusions 92c are configured to protrude from the inner surface of the left partial housing 92 toward the motor 25. The left partial housing 92 includes two sixth protrusions 92c.

[0105] As shown in FIG. 3, the right partial housing 91 includes a front bearing support portion 91d and a rear bearing support portion 91e. The front bearing support portion 91d is configured to protrude from the inner surface of the right partial housing 91 toward the front bearing 25a of the motor 25. The front bearing support portion 91d includes a front bearing abutment portion 91d1. The front bearing abutment portion 91d1 is configured to abut against the front bearing 25a. The rear bearing support portion 91e is formed on the inner surface of the rear side of the right partial housing 91. The rear bearing support portion 91e includes a rear bearing abutment portion 91e1. The rear bearing abutment portion 91e1 is configured to abut against the rear bearing 25b.

[0106] As shown in FIG. 5, the left partial housing 92 includes a front bearing support portion 92d and a rear bearing support portion 92e. The front bearing support portion 92d is configured to protrude from the inner surface of the left partial housing 92 toward the front bearing 25a of the motor 25. The front bearing support portion 92d includes a front bearing abutment portion 92d1. The front bearing abutment portion 92d1 is configured to abut against the front bearing 25a. The rear bearing support portion 92e is formed on the inner surface of the rear side of the left partial housing 92. The rear bearing support portion 92e includes a rear bearing abutment portion 92e1. The rear bearing abutment portion 92e1 is configured to abut against the rear bearing 25b. [2-1-4. Rotor] 4 and 8, the rotor 70 has a rotor shaft 71, a plurality of magnetic pole portions 72, and a rotor core 73. The rotor 70 rotates about a rotation axis AX.

[0107] The rotor core 73 is configured to include a plurality of stacked steel plates. The steel plates are made of metal whose main component is iron. The rotor core 73 has a generally cylindrical shape. The rotor core 73 is disposed so as to surround the rotation axis AX. The rotor core 73 has a through-hole formed in the center of the generally cylindrical shape so as to penetrate from the front surface to the rear surface of the rotor core 73.

[0108] The rotor shaft 71 is disposed in a through-hole of the rotor core 73, extending in the axial direction. The rotor shaft 71 is fixed to the rotor core 73. The front portion of the rotor shaft 71 protrudes forward from the front end portion of the rotor core 73 and is rotatably supported by the front bearing 25a. The rear portion of the rotor shaft 71 protrudes rearward from the rear end portion of the rotor core 73 and is rotatably supported by the rear bearing 25b.

[0109] The multiple magnetic pole portions 72 are arranged at regular intervals in the circumferential direction of the rotor core 73, centered on the rotation axis AX. Each of the multiple magnetic pole portions 72 has a permanent magnet embedded in the rotor core 73. Each of the multiple magnetic pole portions 72 is arranged radially outward from the rotation axis AX. That is, the multiple magnetic pole portions 72 are arranged in a spoke-like pattern, centered on the rotation axis AX. Each of the multiple magnetic pole portions 72 has an N-pole region and an S-pole region. The multiple magnetic pole portions 72 are arranged such that the same poles of adjacent magnetic pole portions 72 face each other in the circumferential direction. That is, the N-pole of a certain magnetic pole portion 72 faces the N-pole of the magnetic pole portion 72 adjacent to it in the circumferential direction. Also, the S-pole of a certain magnetic pole portion 72 faces the S-pole of the magnetic pole portion 72 adjacent to it in the circumferential direction. In this embodiment, the multiple magnetic pole portions 72 include eight magnetic pole portions 72.

[0110] As shown in FIGS. 4 and 8 , the fan 80 is fixed to the rear side of the rotor shaft 71. The fan 80 is disposed rearward of the rotor core 73. When the rotor shaft 71 rotates, the fan 80 rotates together with the rotor shaft 71. [2-1-5. Stator] As shown in Figures 4, 8, and 9, the stator 30 includes a stator core 40, a first insulator 51, a second insulator 52, a plurality of coils 34, a conductive member 55, a power line 61, and three fixing screws 59.

[0111] The stator core 40 is configured to include a plurality of steel plates stacked in the axial direction. The steel plates are metal plates whose main component is iron. 9, stator core 40 includes yoke portion 40a and multiple teeth 40b. Yoke portion 40a is formed in a cylindrical or annular shape. Yoke portion 40a is disposed so that the central axis of the cylindrical or annular shape coincides with rotation axis AX.

[0112] The plurality of teeth 40b protrude radially inward (in other words, toward the rotation axis AX) from the inner peripheral surface of the yoke portion 40a. The plurality of teeth 40b are arranged at equal intervals along the circumferential direction. The plurality of teeth 40b are formed integrally with the yoke portion 40a. In this embodiment, the plurality of teeth 40b includes six teeth 40b.

[0113] 9, the first insulator 51 and the second insulator 52 are formed as separate bodies and fixed to the stator core 40. The first insulator 51 and the second insulator 52 are electrically insulating members made of, for example, synthetic resin. The first insulator 51 has a shape that covers the front side of the stator core 40. The second insulator 52 has a shape that covers the rear side of the stator core 40.

[0114] That is, the first insulator 51 is fixed to the stator core 40 on the front side of the stator core 40, and covers the front surface of the stator core 40. The second insulator 52 is fixed to the stator core 40 on the rear side of the stator core 40, and covers the rear surface of the stator core 40.

[0115] The first insulator 51, the stator core 40, and the second insulator 52 thus configured are configured so as to be separable from one another. The first insulator 51 and the second insulator 52 are not limited to being formed separately from each other, and may be fixed to the stator core 40 by integral molding.

[0116] 4, 8, and 9, the first insulator 51 includes a first main body portion 51a and a plurality of first teeth 51b. The first main body portion 51a is formed in a cylindrical or annular shape. The first main body portion 51a is disposed so that the central axis of the cylindrical or annular shape coincides with the rotation axis AX.

[0117] The first teeth 51b protrude radially inward (i.e., toward the rotation axis AX) from the inner circumferential surface of the annular (or cylindrical) member of the first main body 51a. In this embodiment, the first teeth 51b include six first teeth 51b. Each of the first teeth 51b covers the front surface of a corresponding one of the teeth 40b.

[0118] 4, 8, and 9, the second insulator 52 includes a second main body portion 52a and a plurality of second teeth 52b. The second main body portion 52a is formed in a cylindrical or annular shape. The second main body portion 52a is disposed so that the central axis of the cylindrical or annular shape coincides with the rotation axis AX.

[0119] The second teeth 52b protrude radially inward (i.e., toward the rotation axis AX) from the inner circumferential surface of the annular (or cylindrical) member of the second main body 52a. In this embodiment, the second teeth 52b include six second teeth 52b. Each of the second teeth 52b covers the rear surface of a corresponding one of the teeth portions 40b.

[0120] One stator tooth is formed by one tooth 40b of the plurality of tooth portions 40b, one first tooth 51b of the plurality of first teeth 51b corresponding to the tooth portion 40b, and one second tooth 52b of the plurality of second teeth 52b corresponding to the tooth portion 40b. In other words, the stator 30 of this embodiment has six stator teeth.

[0121] The stator 30 has 3m slots (m is a natural number). As an example, the stator 30 of this embodiment has six stator teeth. Therefore, the stator 30 of this embodiment has six slots. That is, m=2 in this embodiment. Each of the six slots corresponds to a space between two adjacent stator teeth. [2-1-6. Coil] 4 and 8, in this embodiment, the plurality of coils 34 includes six coils 34. Each of the six coils 34 is provided on a corresponding one of the six stator teeth. That is, each of the six coils 34 is wound around the corresponding stator tooth and provided in a predetermined space in the stator core 40, the first insulator 51, and the second insulator 52.

[0122] The multiple coils 34 are wound in series around the teeth 40b of the stator core 40 via the first insulator 51 and the second insulator 52. More specifically, each of the multiple coils 34 is wound around one of the teeth 40b via the first tooth 51b and the second tooth 52b. In other words, each of the six coils 34 is disposed around the teeth 40b, the first tooth 51b, and the second tooth 52b. The six coils 34 and the stator core 40 are electrically insulated by the first insulator 51 and the second insulator 52.

[0123] The six coils 34 are formed using one wire 35. The coils 34 that are adjacent in the circumferential direction are connected by a connecting wire 34a that is part of the wire 35. The connecting wire 34a is located between one coil 34 and the other coils 34, and is supported by the first insulator 51.

[0124] The power supply line 61 is electrically connected to the battery pack 3 via the controller 100. The battery pack 3 supplies a driving current to the motor 25 via the controller 100. The controller 100 supplies the driving current from the battery pack 3 to the motor 25 to excite the stator 30.

[0125] 3, 4, 7, 8, and 9, power supply line 61 includes U-phase power supply line 61U, V-phase power supply line 61V, and W-phase power supply line 61W. U-phase power supply line 61U is supplied with a U-phase drive current. V-phase power supply line 61V is supplied with a V-phase drive current. W-phase power supply line 61W is supplied with a W-phase drive current.

[0126] As shown in FIGS. 4 and 8 , the six coils 34 include three pairs of coils, and each pair of coils is assigned to one of the U-phase, V-phase, and W-phase. That is, pairs of coils 34 are assigned to the U-phase, V-phase, and W-phase. The first pair of coils 34 is assigned to the U-phase and includes a U-phase coil 34U1 and a U-phase coil 34U2. The U-phase coil 34U1 and the U-phase coil 34U2 are arranged to face each other in the radial direction. The second pair of coils 34 is assigned to the V-phase and includes a V-phase coil 34V1 and a V-phase coil 34V2. The V-phase coil 34V1 and the V-phase coil 34V2 are arranged to face each other in the radial direction. The third pair of coils 34 is assigned to the W-phase and includes a W-phase coil 34W1 and a W-phase coil 34W2. The W-phase coil 34W1 and the W-phase coil 34W2 are arranged to face each other in the radial direction.

[0127] Specifically, in the circumferential direction, V-phase coil 34V1 is arranged next to U-phase coil 34U1, and W-phase coil 34W1 is arranged next to V-phase coil 34V1. U-phase coil 34U2 is arranged next to W-phase coil 34W1, V-phase coil 34V2 is arranged next to U-phase coil 34U2, W-phase coil 34W2 is arranged next to V-phase coil 34V2, and U-phase coil 34U1 is arranged next to W-phase coil 34W2.

[0128] The controller 100 controls the current flowing through the U-phase coil 34U1, the U-phase coil 34U2, the V-phase coil 34V1, the V-phase coil 34V2, and the W-phase coil 34W1, the W-phase coil 34W2 by switching the current through the U-phase power line 61U, the V-phase power line 61V, and the W-phase power line 61W.

[0129] 9, the conductive member 55 is disposed rearward of the second insulator 52. The conductive member 55 is disposed at a position where it is stacked on the yoke portion 40a via the second insulator 52 in the axial direction of the rotation axis AX. In other words, the conductive member 55 is electrically insulated from the stator core 40 by the second insulator 52. The conductive member 55 is a member formed using a conductive material.

[0130] In other words, the conductive member 55 is laminated on the second insulator 52 in a manner that the conductive member 55 is in contact with the second insulator 52. The conductive member 55 is laminated on the second insulator 52 on the side of the second insulator 52 opposite to the side facing the stator core 40 in the axial direction of the rotation axis AX.

[0131] The conductive member 55 is not limited to being stacked on the second insulator 52 in contact with the second insulator 52, and may be stacked on the second insulator 52 without contacting the second insulator 52 (for example, via another member). In other words, the conductive member 55 may be stacked on the second insulator 52 in a non-contact manner (for example, via another member) on the side of the second insulator 52 opposite to the side facing the stator core 40 in the axial direction of the rotation axis AX.

[0132] An example of a form in which the conductive member 55 is stacked on the second insulator 52 via another member is a form in which an insulating member 258 (see Figure 19), which will be described later, is placed between the conductive member 55 and the second insulator 52.

[0133] The conductive members 55 include the same number of conductive members as the number of phases of the coils 34. In this embodiment, the motor 25 includes three-phase (U-phase, V-phase, and W-phase) coils 34, and the conductive members 55 include a U-phase conductive member 55U, a V-phase conductive member 55V, and a W-phase conductive member 55W.

[0134] U-phase conductor 55U, V-phase conductor 55V, and W-phase conductor 55W are each disposed on the rear side of yoke portion 40a of stator core 40 via second insulator 52. U-phase conductor 55U, V-phase conductor 55V, and W-phase conductor 55W are each formed in a shape that follows a portion of the annular shape of yoke portion 40a.

[0135] The U-phase conduction member 55U includes a U-phase fixing hole 55U1, a U-phase extension 55U2, and a U-phase fusing terminal 55U3. The U-phase fixing hole 55U1 includes a hole through which a fixing screw 59 can be inserted. The U-phase extension 55U2 is formed in a shape that follows a portion of the annular shape of the yoke portion 40a. The U-phase extension 55U2 electrically connects the U-phase fixing hole 55U1 and the U-phase fusing terminal 55U3. The U-phase fusing terminal 55U3 is connected by fusing to the coil 34 and the wire 35 (not shown in FIG. 9 ) that constitutes the connecting wire 34a. The U-phase fusing terminal 55U3 is electrically connected to the coil 34 and the connecting wire 34a.

[0136] Fusing is a processing method that uses electrical resistance to thermocompression bond (diffusion bonding) a wire and a fusing terminal. The fusing process is characterized by the fact that it can strip the insulating coating of the wire and crimp the wire and fusing terminal at the same time by applying heat and pressure. The fusing terminal may be configured using a crimp terminal. The wire may have an insulating coating.

[0137] The V-phase conduction member 55V includes a V-phase fixing hole 55V1, a V-phase extension 55V2, and a V-phase fusing terminal 55V3. The V-phase fixing hole 55V1 includes a hole through which a fixing screw 59 can be inserted. The V-phase extension 55V2 is formed in a shape that follows a portion of the annular shape of the yoke portion 40a. The V-phase extension 55V2 electrically connects the V-phase fixing hole 55V1 and the V-phase fusing terminal 55V3. The V-phase fusing terminal 55V3 is connected by fusing to the coil 34 and the wire 35 (not shown in FIG. 9 ) that constitutes the connecting wire 34a. The V-phase fusing terminal 55V3 is electrically connected to the coil 34 and the connecting wire 34a.

[0138] The W-phase conduction member 55W includes a W-phase fixing hole 55W1, a W-phase extension 55W2, a first W-phase fusing terminal 55W3, and a second W-phase fusing terminal 55W4. The W-phase fixing hole 55W1 includes a hole through which a fixing screw 59 can be inserted. The W-phase extension 55W2 is formed in a shape that follows a portion of the annular shape of the yoke portion 40a. The W-phase extension 55W2 electrically connects the W-phase fixing hole 55W1 to the first W-phase fusing terminal 55W3 and the second W-phase fusing terminal 55W4. The first W-phase fusing terminal 55W3 and the second W-phase fusing terminal 55W4 are connected by fusing to the coil 34 and the wire 35 (not shown in FIG. 9) that constitutes the connecting wire 34a, respectively. The first W-phase fusing terminal 55W3 and the second W-phase fusing terminal 55W4 are electrically connected to the coil 34 and the connecting wire 34a, respectively.

[0139] The U-phase power supply wire 61U includes a U-phase fixing hole portion 61U1 and a U-phase crimping portion 61U2. The U-phase fixing hole portion 61U1 includes a hole through which a fixing screw 59 can be inserted. The U-phase crimping portion 61U2 is configured to crimp and connect a U-phase power wiring (not shown). The U-phase power wiring is configured to electrically connect the U-phase power supply wire 61W and the battery pack 3 via the controller 100.

[0140] The V-phase power supply line 61V includes a V-phase fixing hole portion 61V1 and a V-phase crimping portion 61V2. The V-phase fixing hole portion 61V1 includes a hole through which a fixing screw 59 can be inserted. The V-phase crimping portion 61V2 is configured to crimp and connect a V-phase power wiring (not shown). The V-phase power wiring is configured to electrically connect the V-phase power supply line 61V and the battery pack 3 via the controller 100.

[0141] The W-phase power supply wire 61W includes a W-phase fixing hole portion 61W1 and a W-phase crimping portion 61W2. The W-phase fixing hole portion 61W1 includes a hole through which a fixing screw 59 can be inserted. The W-phase crimping portion 61W2 is configured to crimp and connect a W-phase power wiring (not shown). The W-phase power wiring is configured to electrically connect the W-phase power supply wire 61W and the battery pack 3 via the controller 100.

[0142] Three fixing screws 59 fix U-phase conductive member 55U, V-phase conductive member 55V, W-phase conductive member 55W, U-phase power supply 61U, V-phase power supply 61V, and W-phase power supply 61W to second insulator 52. Fixation with three fixing screws 59 electrically connects U-phase conductive member 55U to U-phase power supply 61U, electrically connects V-phase conductive member 55V to V-phase power supply 61V, and electrically connects W-phase conductive member 55W to W-phase power supply 61W. [2-1-7. Circuit Board] 3, 4, and 8, the substrate 62 is disposed on the front side of the first insulator 51. The substrate 62 is fixed to the first insulator 51 by screws 63.

[0143] 8, three Hall sensors 62a corresponding to the U phase, V phase, and W phase are attached to the rear surface of the substrate 62. The three Hall sensors 62a output detection signals to the controller 100 via signal lines (not shown). The controller 100 controls the drive currents supplied to the six coils 34 based on the detection signals received from the three Hall sensors 62a. [2-1-8. Contact portion of stator core and contact portion of first insulator] As shown in FIGS. 4, 7, 8, and 9, the yoke portion 40a of the stator core 40 includes a plurality of contact portions 40c. The plurality of contact portions 40c are arranged at predetermined intervals on the outer peripheral surface of the yoke portion 40a. The plurality of contact portions 40c are formed to protrude outward from the yoke portion 40a. The plurality of contact portions 40c include two first contact portions 40c1 and two third contact portions 40c2. The two first contact portions 40c1 are arranged in a right region of the outer peripheral surface of the yoke portion 40a. The two third contact portions 40c2 are arranged in a left region of the outer peripheral surface of the yoke portion 40a.

[0144] As shown in FIGS. 4, 8, and 9, the first main body portion 51a of the first insulator 51 includes a plurality of contact portions 51c. The plurality of contact portions 51c are arranged at predetermined intervals on the outer peripheral surface of the first main body portion 51a. The plurality of contact portions 51c include two second contact portions 51c1 and two fourth contact portions 51c2. The two second contact portions 51c1 are arranged in a right region of the outer peripheral surface of the first main body portion 51a. The two fourth contact portions 51c2 are arranged in a left region of the outer peripheral surface of the first main body portion 51a.

[0145] Each of the two second contact portions 51c1 protrudes radially outward from the outer circumferential surface of the first main body portion 51a. Each of the two fourth contact portions 51c2 protrudes radially outward from the outer circumferential surface of the first main body portion 51a. [2-1-9. Fixing the motor to the housing] 2 to 9, the fixing of the motor 25 (specifically, the stator 30 and the rotor 70) to the housing 90 (specifically, the right partial housing 91 and the left partial housing 92) will be described.

[0146] The right partial housing 91 is assembled to the motor 25 from the right side, and the left partial housing 92 is assembled to the motor 25 from the left side, thereby fixing the motor 25 between the right partial housing 91 and the left partial housing 92. At this time, the stator 30 and the rotor 70 of the motor 25 are fixed to the housing 90 separately.

[0147] The stator 30 is assembled to the right partial housing 91 with the two first contact portions 40c1 in contact with or adjacent to the two first protrusions 91a, respectively, and the two second contact portions 51c1 in contact with or adjacent to the second protrusions 91b, respectively. The stator 30 is assembled to the left partial housing 92 with the two third contact portions 40c2 in contact with or adjacent to the two third protrusions 92a, respectively, and the two fourth contact portions 51c2 in contact with or adjacent to the fourth protrusions 92b, respectively.

[0148] When at least one of the two first abutment portions 40c1 abuts against the first protrusion 91a or when at least one of the two third abutment portions 40c2 abuts against the third protrusion 92a, the stator 30 is prevented from moving forward inside the housing 90.

[0149] When at least one of the two second abutment portions 51c1 abuts against the second protrusion 91b or when at least one of the two fourth abutment portions 51c2 abuts against the second protrusion 91b, the stator 30 is prevented from moving rearward inside the housing 90.

[0150] The stator 30 is assembled to the right partial housing 91 with the two first contact portions 40c1 in contact with or close to the two fifth protrusions 91c, respectively. The stator 30 is assembled to the left partial housing 92 with the two third contact portions 40c2 in contact with or close to the two sixth protrusions 92c, respectively.

[0151] When at least one of the two first contact portions 40c1 comes into contact with the fifth protrusion 91c or when at least one of the two third contact portions 40c2 comes into contact with the sixth protrusion 92c, the stator 30 is restricted from moving in the circumferential direction about the rotation axis AX inside the housing 90. The restricted circumferential movement at this time includes movement in both the first direction and the second direction (see FIG. 2).

[0152] As a result, the relative axial and circumferential positions of the stator 30 with respect to the housing 90 are maintained constant. The rotor 70 is assembled to the housing 90 with the front bearing 25a abutting against the front bearing abutment portion 91d1 of the front bearing support portion 91d and the front bearing abutment portion 92d1 of the front bearing support portion 92d, and the rear bearing 25b abutting against the rear bearing abutment portion 91e1 of the rear bearing support portion 91e and the rear bearing abutment portion 92e1 of the rear bearing support portion 92e. [2-1-10. Connection structure between coil and conductive member] As shown in FIGS. 10, 12, and 13, the wire 35 that constitutes the six coils 34 has a first end 35a and a second end 35b.

[0153] The first end 35a is connected to a first W-phase fusing terminal 55W3 of the W-phase conduction member 55W, and the second end 35b is connected to a second W-phase fusing terminal 55W4 of the W-phase conduction member 55W.

[0154] 11, the first W-phase fusing terminal 55W3 is configured using a plate-shaped member 56 that is bent so that its cross section is U-shaped. The plate-shaped member 56 has a closed end 56a of the U-shape and an open end 56b of the U-shape. The first W-phase fusing terminal 55W3 is disposed such that a first extension direction connecting the closed end 56a and the open end 56b is parallel to the axial direction of the rotation axis AX.

[0155] The first W-phase fusing terminal 55W3 is connected to the first end 35a with the first end 35a disposed in the U-shaped interior 56c of the plate-shaped member 56. Specifically, the first W-phase fusing terminal 55W3 and the first end 35a are electrically connected to each other by fusing.

[0156] Similar to the first W-phase fusing terminal 55W3, the second W-phase fusing terminal 55W4 is configured using a plate-like member 56 that is bent so that its cross section is U-shaped. Similar to the first W-phase fusing terminal 55W3, the second W-phase fusing terminal 55W4 is disposed such that a first extension direction connecting the closed end 56a and the open end 56b is parallel to the axial direction of the rotation axis AX.

[0157] The second W-phase fusing terminal 55W4 is connected to the second end 35b with the second end 35b disposed in the U-shaped interior 56c of the plate-shaped member 56. Specifically, the second W-phase fusing terminal 55W4 and the second end 35b are electrically connected to each other by fusing.

[0158] As shown in Figures 10 and 12, the position of the first W-phase fusing terminal 55W3 is different from the position of the second W-phase fusing terminal 55W4 in terms of their positions in the circumferential direction along the annular shape of the yoke portion 40a (in other words, the circumferential direction centered on the rotation axis AX).

[0159] Specifically, first W-phase fusing terminal 55W3 is disposed between teeth 40b and second W-phase fusing terminal 55W4 in the circumferential direction along the annular shape of yoke portion 40a. Teeth 40b here are teeth 40b that correspond to W-phase coil 34W2. In other words, first W-phase fusing terminal 55W3 is disposed between W-phase coil 34W2 and second W-phase fusing terminal 55W4 in the circumferential direction along the annular shape of yoke portion 40a.

[0160] As shown in FIG. 10, the position of the first end 35a is the same as the position of the second end 35b in the axial direction of the rotation axis AX (the up-down direction indicated by the arrow in the figure).

[0161] When viewed from a direction perpendicular to the rotation axis AX, the first end 35a and the second end 35b are arranged so as to overlap the arrangement area of ​​the coil 34. In other words, with respect to the arrangement area in the axial direction of the rotation axis AX, the arrangement positions of the first end 35a and the second end 35b are included in the arrangement area of ​​the coil 34.

[0162] In a stator 30 configured in this manner, when connecting the first end 35a to the first W-phase fusing terminal 55W3 and the second end 35b to the second W-phase fusing terminal 55W4, there is no need to adopt a configuration in which the first end 35a and the second end 35b are stacked in the axial direction of the rotation axis AX.

[0163] Stator 30 is configured such that teeth 40b are located between first W-phase fusing terminal 55W3 and second W-phase fusing terminal 55W4 in the circumferential direction along the annular shape of yoke portion 40a, thereby ensuring a certain distance or more between first W-phase fusing terminal 55W3 and second W-phase fusing terminal 55W4.

[0164] Of the conductive member 55, the V-phase fusing terminal 55V3 and the U-phase fusing terminal 55U3 are also configured using a plate-like member 56 bent so that its cross section is U-shaped, similar to the first W-phase fusing terminal 55W3. [2-1-11. Electrical connection between coil and conductive member] As shown schematically in Figure 13, the single wire 35 that constitutes the coil 34 starts from the second end 35b and is arranged in the order of U-phase coil 34U1 (#1), U-phase coil 34U2 (#4), V-phase coil 34V2 (#5), V-phase coil 34V1 (#2), W-phase coil 34W1 (#3), and W-phase coil 34W2 (#6), before reaching the first end 35a.

[0165] 13, the coil 34, wire 35, conductive member 55, etc. are depicted with the upper side of the drawing representing the rear side of the electric operating machine 1 and the lower side of the drawing representing the front side of the electric operating machine 1. In other words, in FIG. 13, the portion of the wire 35 depicted below the coil 34 is the connection wire 34a that is positioned further forward than the coil 34.

[0166] A portion of wire 35 between V-phase coil 34V1 (#2) and W-phase coil 34W1 (#3) is connected to V-phase fusing terminal 55V3. A portion of wire 35 between U-phase coil 34U2 (#4) and V-phase coil 34V2 (#5) is connected to U-phase fusing terminal 55U3. [2-1-12. Connecting process between conductive member and coil] The process of connecting the conductive member 55 and the coil 34 (in other words, the wire 35) of the motor 25 will be described.

[0167] First, conductive members 55 (U-phase conductive member 55U, V-phase conductive member 55V, W-phase conductive member 55W) are arranged on the assembled first insulator 51, stator core 40, and second insulator 52. Specifically, conductive members 55 are arranged in positions where they are stacked on yoke portion 40a with second insulator 52 interposed therebetween in the axial direction of rotation axis AX.

[0168] At this time, the first W-phase fusing terminal 55W3 is arranged at a different position from the second W-phase fusing terminal 55W4 in the circumferential direction along the annular shape of the yoke portion 40a (in other words, the circumferential direction centered on the rotation axis AX).

[0169] Furthermore, at this time, the first W-phase fusing terminal 55W3 is disposed at the same position as the second W-phase fusing terminal 55W4 in the axial direction of the rotation axis AX. Next, wire 35 is wound around multiple stator teeth (tooth portion 40b, first teeth 51b, second teeth 52b) to form multiple coils 34. At this time, while winding wire 35, wire 35 is inserted through plate-like members 56 that respectively constitute U-phase fusing terminal 55U3 and V-phase fusing terminal 55V3.

[0170] Next, the first W-phase fusing terminal 55W3 is connected to the first end 35a, and the second W-phase fusing terminal 55W4 is connected to the second end 35b. First, the first end 35a and the second end 35b are inserted through the plate-like members 56 that form the first W-phase fusing terminal 55W3 and the second W-phase fusing terminal 55W4, respectively. After the insertion, a fusing process is performed to complete the connection between the first W-phase fusing terminal 55W3 and the first end 35a, and the connection between the second W-phase fusing terminal 55W4 and the second end 35b.

[0171] At this time, the first end 35a and the second end 35b are arranged so as to overlap the arrangement area of ​​the coil 34 when viewed from a direction perpendicular to the axial direction of the rotation axis AX. In this connection operation, either the first end 35a or the second end 35b may be connected first. The fusing process may also be performed simultaneously to connect the wire 35 to each of the U-phase fusing terminal 55U3 and the V-phase fusing terminal 55V3.

[0172] In this way, the process of connecting the conductive member 55 and the coil 34 (in other words, the wire 35) is completed. [2-1-13.Effects] According to the first embodiment described above, the following effects are achieved.

[0173] (1) As described above, in the stator 30, when connecting the first end 35a to the first W-phase fusing terminal 55W3 and the second end 35b to the second W-phase fusing terminal 55W4, it is not necessary to adopt a configuration in which the first end 35a and the second end 35b are stacked in the axial direction of the rotation axis AX.

[0174] Therefore, when connecting the wire 35 and the conductive member 55, the axial dimension of the motor 25 can be reduced compared to when the first end 35a and the second end 35b are stacked in the axial direction of the rotation axis AX.

[0175] Therefore, by providing the motor 25, the electric working machine 1 can be realized as an electric working machine that can be prevented from becoming large in size. (2) Stator 30 is configured such that teeth 40b are located between first W-phase fusing terminal 55W3 and second W-phase fusing terminal 55W4 in the circumferential direction along the annular shape of yoke portion 40a, thereby ensuring a certain distance or more between first W-phase fusing terminal 55W3 and second W-phase fusing terminal 55W4.

[0176] Therefore, in the electric work machine 1, a certain distance or more can be secured between the connection work area between the first W-phase fusing terminal 55W3 and the first end 35a and the connection work area between the second W-phase fusing terminal 55W4 and the second end 35b, thereby reducing the complexity of each connection work.

[0177] (3) In the electric operating machine 1, the Hall sensor 62a and the conductive member 55 are arranged to sandwich the stator core 40. Specifically, the conductive member 55, the stator core 40, and the Hall sensor 62a are arranged in this order from the rear side to the front side in the axial direction of the rotation shaft AX.

[0178] That is, in the axial direction of the rotating shaft AX, the Hall sensor 62a and the conductive member 55 are arranged on opposite sides of the stator core 40. In other words, the Hall sensor 62a is located on the opposite side of the stator core 40 from the conductive member 55 in the axial direction of the rotating shaft AX.

[0179] Therefore, the electric operating machine 1 can prevent the conductive member 55 and the Hall sensor 62a from interfering with each other, and can prevent the size of the motor 25 from increasing in the axial direction. (4) When viewed from the axial direction of rotation shaft AX, first W-phase fusing terminal 55W3 and second W-phase fusing terminal 55W4 are arranged in an area overlapping stator core 40. In electric operating machine 1 configured in this manner, first W-phase fusing terminal 55W3 and second W-phase fusing terminal 55W4 can be prevented from being arranged radially outward of stator core 40.

[0180] Therefore, the electric working machine 1 can prevent the size of the motor 25 from increasing in a direction perpendicular to the axial direction (in other words, in a radial direction about the rotation axis AX), and therefore can prevent the electric working machine 1 from becoming larger. [2-1-14. Terminology] The motor 25 corresponds to an example of a brushless motor in the generalization of the embodiments.

[0181] U-phase fusing terminal 55U3, V-phase fusing terminal 55V3, first W-phase fusing terminal 55W3, and second W-phase fusing terminal 55W4 correspond to an example of a connecting portion in the summary of the embodiment. U-phase fixing hole 55U1, V-phase fixing hole 55V1, and W-phase fixing hole 55W1 correspond to an example of a power receiving portion in the summary of the embodiment.

[0182] The first W-phase fusing terminal 55W3 corresponds to an example of a first connection portion in the summary of the embodiments, and the second W-phase fusing terminal 55W4 corresponds to an example of a second connection portion in the summary of the embodiments.

[0183] The Hall sensor 62a corresponds to an example of a rotation detection sensor in the generalization of the embodiment. [2-2. Second embodiment] [2-2-1. Differences from the first embodiment] The second embodiment has the same basic configuration as the first embodiment, so differences will be described below. Note that the same reference numerals as those in the first embodiment indicate the same configuration, and reference will be made to the preceding description.

[0184] The second electric operating machine 101 according to the second embodiment differs from the electric operating machine 1 according to the first embodiment in that a second conducting member 155 is provided instead of the conducting member 55. [2-2-2. Second conductive member] 14 to 16, the second conduction member 155 differs from the conduction member 55 in that it includes a second W-phase conduction member 155W instead of the W-phase conduction member 55W. That is, the second conduction member 155 includes a U-phase conduction member 55U, a V-phase conduction member 55V, and a second W-phase conduction member 155W.

[0185] The second W-phase conductor 155W is disposed rearward of the yoke portion 40a of the stator core 40 via the second insulator 52. The second W-phase conductor 155W is formed in a shape that follows part of the annular shape of the yoke portion 40a.

[0186] The second W-phase conduction member 155W includes a second W-phase fixing hole 155W1, a second W-phase extension 155W2, a third W-phase fusing terminal 155W3, and a fourth W-phase fusing terminal 155W4. The second W-phase fixing hole 155W1 includes a hole through which a fixing screw 59 can be inserted. The second W-phase extension 155W2 is formed in a shape that follows a portion of the annular shape of the yoke portion 40a. The second W-phase extension 155W2 electrically connects the second W-phase fixing hole 155W1, the third W-phase fusing terminal 155W3, and the fourth W-phase fusing terminal 155W4. The third W-phase fusing terminal 155W3 and the fourth W-phase fusing terminal 155W4 are connected to the coil 34 and the wire 35 that constitutes the connecting wire 34a, respectively, by fusing. The third W-phase fusing terminal 155W3 and the fourth W-phase fusing terminal 155W4 are electrically connected to the coil 34 and the connecting wire 34a, respectively. [2-2-3. Connection structure between coil and conductive member] 14, the first end 35a of the wire 35 is connected to the third W-phase fusing terminal 155W3 of the second W-phase conducting member 155W, and the second end 35b is connected to the fourth W-phase fusing terminal 155W4 of the second W-phase conducting member 155W.

[0187] 15, the third W-phase fusing terminal 155W3 is configured using a plate-shaped member 56 that is bent so that its cross section is U-shaped. The plate-shaped member 56 has a closed end 56a of the U-shape and an open end 56b of the U-shape. The third W-phase fusing terminal 155W3 is disposed such that a first extension direction connecting the closed end 56a and the open end 56b is parallel to the axial direction of the rotation axis AX.

[0188] The third W-phase fusing terminal 155W3 is connected to the first end 35a of the wire 35, with the first end 35a being disposed in the U-shaped interior 56c of the plate-like member 56. More specifically, the third W-phase fusing terminal 155W3 and the first end 35a are electrically connected to each other by fusing.

[0189] Fourth W-phase fusing terminal 155W4 is adjacent to third W-phase fusing terminal 155W3. Like third W-phase fusing terminal 155W3, fourth W-phase fusing terminal 155W4 is configured using plate-like member 56 bent so that its cross section is U-shaped. Like third W-phase fusing terminal 155W3, fourth W-phase fusing terminal 155W4 is arranged such that a first extension direction connecting closed end 56a and open end 56b is parallel to the axial direction of rotation axis AX.

[0190] The fourth W-phase fusing terminal 155W4 is connected to the second end 35b of the wire 35, with the second end 35b being disposed in the U-shaped interior 56c of the plate-like member 56. Specifically, the fourth W-phase fusing terminal 155W4 and the second end 35b are electrically connected to each other by fusing.

[0191] 14, the position of third W-phase fusing terminal 155W3 differs from the position of fourth W-phase fusing terminal 155W4 in the circumferential direction along the annular shape of yoke portion 40a (in other words, the circumferential direction centered on rotation axis AX). Specifically, third W-phase fusing terminal 155W3 is located adjacent to fourth W-phase fusing terminal 155W4 in the circumferential direction along the annular shape of yoke portion 40a.

[0192] Third W-phase fusing terminal 155W3 and fourth W-phase fusing terminal 155W4 are disposed between two teeth 40b in the circumferential direction along the annular shape of yoke portion 40a. Here, the two teeth 40b are the tooth 40b corresponding to U-phase coil 34U1 and the tooth 40b corresponding to W-phase coil 34W2. In other words, third W-phase fusing terminal 155W3 is disposed at a position between it and fourth W-phase fusing terminal 155W4 in the circumferential direction along the annular shape of yoke portion 40a, where no teeth 40b are present.

[0193] In the second embodiment, similarly to the first embodiment, the position of the first end 35a is the same as the position of the second end 35b in the axial direction of the rotation axis AX (the up-down direction indicated by the arrow in the figure). Furthermore, with regard to the arrangement region in the axial direction of the rotation axis AX, the arrangement positions of the first end 35a and the second end 35b are included in the arrangement region of the coil 34.

[0194] In a stator 30 including a second W-phase conductive member 155W, when connecting the first end 35a to the third W-phase fusing terminal 155W3 and the second end 35b to the fourth W-phase fusing terminal 155W4, it is not necessary to adopt a configuration in which the first end 35a and the second end 35b are stacked in the axial direction of the rotation axis AX.

[0195] Furthermore, in the second embodiment, no teeth portion 40b is present between the third W-phase fusing terminal 155W3 and the fourth W-phase fusing terminal 155W4 in the circumferential direction along the annular shape of the yoke portion 40a.

[0196] By adopting such a configuration, the third W-phase fusing terminal 155W3 and the fourth W-phase fusing terminal 155W4 can be brought close to each other, and the wire 35 can be laid so that the first end 35a and the second end 35b are positioned close to each other. [2-2-4. Electrical connection between coil and conductive material] As shown schematically in Figure 16, the single wire 35 constituting the coil 34 starts from the second end 35b and is arranged in the order of U-phase coil 34U1 (#1), U-phase coil 34U2 (#4), V-phase coil 34V2 (#5), V-phase coil 34V1 (#2), W-phase coil 34W1 (#3), and W-phase coil 34W2 (#6), before reaching the first end 35a.

[0197] 16, the coil 34, wire 35, second conductive member 155, etc. are depicted with the upper side of the drawing representing the rear side of the electric operating machine 1 and the lower side of the drawing representing the front side of the second electric operating machine 101. In other words, in FIG. 16, the portion of the wire 35 depicted below the coil 34 is the connecting wire 34a, which is positioned further forward than the coil 34.

[0198] A portion of wire 35 between V-phase coil 34V1 (#2) and W-phase coil 34W1 (#3) is connected to V-phase fusing terminal 55V3. A portion of wire 35 between U-phase coil 34U2 (#4) and V-phase coil 34V2 (#5) is connected to U-phase fusing terminal 55U3. [2-2-5. Connecting process between conductive material and coil] The process of connecting the second conductive member 155 and the coil 34 (in other words, the wire 35) in the motor 25 of the second embodiment will be described.

[0199] First, second conductive member 155 (U-phase conductive member 55U, V-phase conductive member 55V, second W-phase conductive member 155W) is arranged with respect to the assembled first insulator 51, stator core 40, and second insulator 52. Specifically, second conductive member 155 is arranged at a position where it is stacked on yoke portion 40a with second insulator 52 interposed therebetween in the axial direction of rotation axis AX.

[0200] At this time, the third W-phase fusing terminal 155W3 is arranged at a different position from the fourth W-phase fusing terminal 155W4 in the circumferential direction along the annular shape of the yoke portion 40a (in other words, the circumferential direction centered on the rotation axis AX).

[0201] Furthermore, at this time, the third W-phase fusing terminal 155W3 is disposed at the same position as the fourth W-phase fusing terminal 155W4 in terms of the position in the axial direction of the rotation axis AX.

[0202] Next, wire 35 is wound around multiple stator teeth (tooth portion 40b, first teeth 51b, second teeth 52b) to form multiple coils 34. At this time, while winding wire 35, wire 35 is inserted through plate-like members 56 that respectively constitute U-phase fusing terminal 55U3 and V-phase fusing terminal 55V3.

[0203] Next, the third W-phase fusing terminal 155W3 is connected to the first end 35a, and the fourth W-phase fusing terminal 155W4 is connected to the second end 35b. First, the first end 35a and the second end 35b are inserted through the plate-like members 56 that constitute the third W-phase fusing terminal 155W3 and the fourth W-phase fusing terminal 155W4, respectively. After the insertion, a fusing process is performed to complete the connection between the third W-phase fusing terminal 155W3 and the first end 35a, and the connection between the fourth W-phase fusing terminal 155W4 and the second end 35b.

[0204] At this time, the first end 35a and the second end 35b are arranged so as to overlap the arrangement area of ​​the coil 34 when viewed from a direction perpendicular to the axial direction of the rotation axis AX. In this connection operation, either the first end 35a or the second end 35b may be connected first. The fusing process may also be performed simultaneously to connect the wire 35 to each of the U-phase fusing terminal 55U3 and the V-phase fusing terminal 55V3.

[0205] In this way, the process of connecting the second conductive member 155 and the coil 34 (in other words, the wire 35) is completed. [2-2-6. Effects] (1) According to the second embodiment described above, the same effects as those of the first embodiment described above are achieved.

[0206] (2) In the second embodiment, no teeth portion 40b (in other words, coil 34) is present between third W-phase fusing terminal 155W3 and fourth W-phase fusing terminal 155W4 in the circumferential direction along the annular shape of yoke portion 40a. This allows third W-phase fusing terminal 155W3 and fourth W-phase fusing terminal 155W4 to be close to each other, and wire 35 can be laid so that first end 35a and second end 35b are positioned close to each other.

[0207] As a result, in the second electric operating machine 101 of the second embodiment, the same routing path for the wire 35 as when the first end 35a and the second end 35b are connected to a single connection portion can be adopted. Therefore, when changing the number of connection portions of the conductive member from one to two, by using the second W-phase conductive member 155W (in other words, a conductive member including the third W-phase fusing terminal 155W3 and the fourth W-phase fusing terminal 155W4), the workload for changing the routing path for the wire 35 can be reduced. [2-2-7. Terminology] The third W-phase fusing terminal 155W3 and the fourth W-phase fusing terminal 155W4 correspond to an example of a connecting portion in the generalization of the embodiments. The second W-phase fixing hole 155W1 corresponds to an example of a power receiving portion in the generalization of the embodiments.

[0208] The third W-phase fusing terminal 155W3 corresponds to an example of a first connection portion in the generalization of the embodiments, and the fourth W-phase fusing terminal 155W4 corresponds to an example of a second connection portion in the generalization of the embodiments. [2-3. Third embodiment] [2-3-1. Differences from the first embodiment] The second embodiment has the same basic configuration as the first embodiment, so differences will be described below. Note that the same reference numerals as those in the first embodiment indicate the same configuration, and reference will be made to the preceding description.

[0209] As shown in Figures 17 to 20, a third electric operating machine 201 according to the third embodiment differs from the electric operating machine 1 according to the first embodiment in that it includes a third conducting member 255 instead of the conducting member 55, and in that it includes twelve second coils 134 instead of six coils 34. Furthermore, the third embodiment differs from the first embodiment in that the first insulator 51, the stator core 40, and the second insulator 52 each include twelve teeth. Furthermore, the third electric operating machine 201 includes four insulating members 258. Note that the first insulator 51, the stator core 40, and the second insulator 52 according to the third embodiment are not shown in the drawings.

[0210] In this embodiment, a three-phase brushless motor having eight poles and twelve slots is illustrated. The motor 25 of this embodiment has a U-phase, a V-phase, and a W-phase as the three phases. [2-3-2. Third Conductive Component] As shown in FIGS. 17 to 20, the third conduction member 255 includes a third U-phase conduction member 255U, a third V-phase conduction member 255V, and a third W-phase conduction member 255W.

[0211] The third U-phase conductor 255U, the third V-phase conductor 255V, and the third W-phase conductor 255W are arranged on the rear side of the yoke portion 40a of the stator core 40 via the second insulator 52. The third U-phase conductor 255U, the third V-phase conductor 255V, and the third W-phase conductor 255W are formed in shapes that follow part of the annular shape of the yoke portion 40a.

[0212] As will be described later, the third U-phase conductive member 255U, the third V-phase conductive member 255V, and the third W-phase conductive member 255W are stacked from the rear side to the front side of the electric work machine, while being electrically insulated from each other by insulating member 258.

[0213] As shown in FIG. 18(a), third-U-phase conduction member 255U includes third-U-phase fixing hole 255U1, third-U-phase extension 255U2, first-U-phase fusing terminal 255U3, second-U-phase fusing terminal 255U4, and third-U-phase fusing terminal 255U5. Third-U-phase fixing hole 255U1 includes a hole through which fixing screw 59 can be inserted. Third-U-phase extension 255U2 is formed in a shape that follows a portion of the annular shape of yoke portion 40a. Third-U-phase extension 255U2 electrically connects third-U-phase fixing hole 255U1, first-U-phase fusing terminal 255U3, second-U-phase fusing terminal 255U4, and third-U-phase fusing terminal 255U5.

[0214] The first U-phase fusing terminal 255U3, the second U-phase fusing terminal 255U4, and the third U-phase fusing terminal 255U5 are respectively connected by fusing to the twelve second coils 134 and the second wires 135 that constitute the second connecting wires 134a. In other words, the first U-phase fusing terminal 255U3, the second U-phase fusing terminal 255U4, and the third U-phase fusing terminal 255U5 are respectively electrically connected to the twelve second coils 134 and the second connecting wires 134a.

[0215] Similar to the connection wire 34a, the second connection wire 134a is located between one second coil 134 and another second coil 134, and is supported by the first insulator 51 (not shown). 18(b), the third V-phase conduction member 255V includes a third V-phase fixing hole 255V1, a third V-phase extension 255V2, a first V-phase fusing terminal 255V3, and a second V-phase fusing terminal 255V4. The third V-phase fixing hole 255V1 includes a hole through which a fixing screw 59 can be inserted. The third V-phase extension 255V2 is formed in a shape that follows a portion of the annular shape of the yoke portion 40a. The third V-phase extension 255V2 electrically connects the third V-phase fixing hole 255V1, the first W-phase fusing terminal 255V3, and the second W-phase fusing terminal 255V4.

[0216] The first V-phase fusing terminal 255V3 and the second V-phase fusing terminal 255V4 are respectively connected by fusing to the wires 35 that constitute the twelve second coils 134 and the second connecting wires 134a. In other words, the first V-phase fusing terminal 255V3 and the second V-phase fusing terminal 255V4 are respectively electrically connected to the twelve second coils 134 and the second connecting wires 134a.

[0217] 18(c), the third W-phase conduction member 255W includes a third W-phase fixing hole 255W1, a third W-phase extension 255W2, a fifth W-phase fusing terminal 255W3, and a sixth W-phase fusing terminal 255W4. The third W-phase fixing hole 255W1 includes a hole through which a fixing screw 59 can be inserted. The third W-phase extension 255W2 is formed in a shape that follows a portion of the annular shape of the yoke portion 40a. The third W-phase extension 255W2 electrically connects the third W-phase fixing hole 255W1, the fifth W-phase fusing terminal 255W3, and the sixth W-phase fusing terminal 255W4.

[0218] The fifth W-phase fusing terminal 255W3 and the sixth W-phase fusing terminal 255W4 are respectively connected by fusing to the wires 35 that constitute the twelve second coils 134 and the second connecting wires 134a. That is, the fifth W-phase fusing terminal 255W3 and the sixth W-phase fusing terminal 255W4 are respectively electrically connected to the twelve second coils 134 and the second connecting wires 134a.

[0219] Although not shown in the figures, the first U-phase fusing terminal 255U3, the second U-phase fusing terminal 255U4, the third U-phase fusing terminal 255U5, the first V-phase fusing terminal 255V3, the second V-phase fusing terminal 255V4, the fifth W-phase fusing terminal 255W3, and the sixth W-phase fusing terminal 255W4 are each constructed using the plate-shaped member 56 described above.

[0220] 19, the four insulating members 258 are configured to electrically insulate the third U-phase conductor 255U, the third V-phase conductor 255V, and the third W-phase conductor 255W from one another. Each of the four insulating members 258 is formed using an insulating material. Each of the four insulating members 258 is formed in an annular shape that follows a portion of the annular shape of the yoke portion 40a.

[0221] One of the four insulating members 258 is arranged between the third V-phase conductor 255V and the third W-phase conductor 255W. Another of the four insulating members 258 is arranged between the third U-phase conductor 255U and the third V-phase conductor 255V. Another of the four insulating members 258 is arranged on the side of the third U-phase conductor 255U opposite to the side facing the third V-phase conductor 255V. Another of the four insulating members 258 is arranged on the side of the third W-phase conductor 255W opposite to the side facing the third V-phase conductor 255V.

[0222] In other words, the third U-phase conductive member 255U, the third V-phase conductive member 255V, the third W-phase conductive member 255W and the four insulating members 258 are arranged on the rear side of the yoke portion 40a of the stator core 40 via the second insulator 52.

[0223] The third U-phase conductive member 255U, the third V-phase conductive member 255V, and the third W-phase conductive member 255W are stacked from the rear side to the front side of the electric operating machine, while being electrically insulated from one another by insulating members 258.

[0224] At this time, the insulating member 258 disposed on the front side of the third W-phase conduction member 255W is laminated on the second insulator 52 in a manner that makes contact with the second insulator 52. In other words, the insulating member 258 is laminated on the second insulator 52 on the side of the second insulator 52 opposite to the side that faces the stator core 40 in the axial direction of the rotation axis AX.

[0225] The third U-phase conductive member 255U, the third V-phase conductive member 255V, and the third W-phase conductive member 255W are not limited to being stacked in this order from the rear side to the front side of the electric work machine, but may also be stacked in this order from the front side to the rear side.

[0226] Furthermore, the third W-phase conduction member 255W is not limited to being stacked on the second insulator 52 without contacting the second insulator 52 via the insulating member 258. For example, the insulating member 258 may be omitted, and the third W-phase conduction member 255W may be stacked on the second insulator 52 in contact with the second insulator 52. In other words, the third W-phase conduction member 255W may be stacked on the second insulator 52 in contact with the second insulator 52 on the side of the second insulator 52 opposite to the side facing the stator core 40 in the axial direction of the rotation axis AX.

[0227] The assembly process for assembling the third U-phase conductive member 255U, the third V-phase conductive member 255V, the third W-phase conductive member 255W and the four insulating members 258 together may involve forming each member individually in advance and stacking them in the configuration described above.

[0228] Alternatively, the assembling step may be a step of arranging the third U-phase conductor 255U, the third V-phase conductor 255V, and the third W-phase conductor 255W inside a mold while they are spaced apart from each other, pouring a liquid insulating material into the mold, and solidifying the insulating material to form the four insulating members 258. In this case, an insulating connecting portion configured to connect the four insulating members 258 to each other may be provided. The insulating connecting portion may be configured to connect the four insulating members 258 to each other by being arranged in the stacking direction. The insulating connecting portion may be provided as a member that integrally combines the third U-phase conductor 255U, the third V-phase conductor 255V, the third W-phase conductor 255W, and the four insulating members 258. [2-3-3. Electrical connection between coil and conductive member] As shown in FIG. 20, the twelve second coils 134 include a first coil C1, a second coil C2, a third coil C3, a fourth coil C4, a fifth coil C5, a sixth coil C6, a seventh coil C7, an eighth coil C8, a ninth coil C9, a tenth coil C10, an eleventh coil C11, and a twelfth coil C12. The twelve second coils 134 are configured using a single second wire 135. The second wire 135 includes a first end 135a and a second end 135b. The second wire 135 is arranged starting from the first end 135a, followed by the coils C1, C4, C5, C8, C9, C12, C7, C10, C11, C2, C3, and C6 in this order, before reaching the second end 135b.

[0229] Note that the order in which the wires are arranged when the multiple coils C1 to C12 are formed using one second wire 135 is not limited to the above order, and may be other orders. In other words, the order in which the multiple coils C1 to C12 are formed may be set arbitrarily.

[0230] A first end 135a of the second wire 135 is connected to a second U-phase fusing terminal 255U4, and a second end 135b of the second wire 135 is connected to a third U-phase fusing terminal 255U5.

[0231] A portion of second wire 135 between the fourth coil C4 and the fifth coil C5 is connected to a fifth W-phase fusing terminal 255W3. A portion of second wire 135 between the eighth coil C8 and the ninth coil C9 is connected to a second V-phase fusing terminal 255V4. A portion of second wire 135 between the twelfth coil C12 and the seventh coil C7 is connected to a first U-phase fusing terminal 255U3. A portion of second wire 135 between the tenth coil C10 and the eleventh coil C11 is connected to a sixth W-phase fusing terminal 255W4. A portion of second wire 135 between the second coil C2 and the third coil C3 is connected to a first V-phase fusing terminal 255V3.

[0232] The second connecting wire 134a corresponds to the portion of the second wire 135 between the first coil C1 and the fourth coil C4, the portion between the fifth coil C5 and the eighth coil C8, the portion between the ninth coil C9 and the twelfth coil C12, the portion between the seventh coil C7 and the tenth coil C10, the portion between the eleventh coil C11 and the second coil C2, and the portion between the third coil C3 and the sixth coil C6. [2-3-4. Connecting the Conductive Material and the Coil] A process of connecting the third conductive member 255 and the second coil 134 (in other words, the second wire 135) in the motor 25 of the third embodiment will be described.

[0233] First, the third conductive member 255 (third U-phase conductive member 255U, third V-phase conductive member 255V, third W-phase conductive member 255W) is arranged with respect to the assembled first insulator 51, stator core 40, and second insulator 52. More specifically, the third conductive member 255 is arranged at a position where it is stacked on the yoke portion 40a via the second insulator 52 in the axial direction of the rotation axis AX.

[0234] At this time, the second U-phase fusing terminal 255U4 is arranged at a different position from the third U-phase fusing terminal 255U5 in the circumferential direction along the annular shape of the yoke portion 40a (in other words, the circumferential direction centered on the rotation axis AX).

[0235] Furthermore, at this time, the second U-phase fusing terminal 255U4 is arranged at the same position as the third U-phase fusing terminal 255U5 in terms of the arrangement position in the axial direction of the rotation axis AX.

[0236] Next, second wire 135 is wound around multiple stator teeth (tooth portion 40b, first tooth 51b, second tooth 52b) to form multiple second coils 134. At this time, while second wire 135 is being wound, second wire 135 is inserted through plate-like members 56 that respectively constitute first V-phase fusing terminal 255V3, fifth W-phase fusing terminal 255W3, first U-phase fusing terminal 255U3, second V-phase fusing terminal 255V4, and sixth W-phase fusing terminal 255W4.

[0237] Next, the second U-phase fusing terminal 255U4 is connected to the first end 135a, and the third U-phase fusing terminal 255U5 is connected to the second end 135b. First, the first end 135a and the second end 135b are inserted through the plate-like members 56 that form the second U-phase fusing terminal 255U4 and the third U-phase fusing terminal 255U5, respectively. After the insertion, a fusing process is performed to complete the connection between the second U-phase fusing terminal 255U4 and the first end 135a, and the connection between the third U-phase fusing terminal 255U5 and the second end 135b.

[0238] At this time, the first end 135a and the second end 135b are arranged so as to overlap the arrangement area of ​​the second coil 134 when viewed from a direction perpendicular to the axial direction of the rotation axis AX. In this connection operation, either the first end 135a or the second end 135b may be connected first. The fusing process may also be performed to connect each of the other fusing terminals to the second wire 135 at the same time.

[0239] In this way, the process of connecting the third conductive member 255 and the second coil 134 (in other words, the second wire 135) is completed. [2-3-5.Effects] (1) According to the third embodiment described above, the same effects as those of the first embodiment described above are achieved.

[0240] (2) In the third embodiment, an 8-pole, 12-slot three-phase brushless motor is exemplified. Therefore, the axial dimensions of the motor can be reduced not only in the 8-pole, 6-slot three-phase brushless motors of the first and second embodiments, but also in motors with 8 poles and 12 slots. [2-3-6. Terminology] First U-phase fusing terminal 255U3, second U-phase fusing terminal 255U4, third U-phase fusing terminal 255U5, first V-phase fusing terminal 255V3, second V-phase fusing terminal 255V4, fifth W-phase fusing terminal 255W3, and sixth W-phase fusing terminal 255W4 each correspond to an example of a connecting portion in the summary of the embodiment. Third U-phase fixing hole 255U1, third V-phase fixing hole 255V1, and third W-phase fixing hole 255W1 correspond to an example of a power receiving portion in the summary of the embodiment.

[0241] The second U-phase fusing terminal 255U4 corresponds to an example of a first connection portion in the generalization of the embodiments, and the third U-phase fusing terminal 255U5 corresponds to an example of a second connection portion in the generalization of the embodiments. [2-4. Fourth embodiment] [2-4-1. Differences from the third embodiment] The fourth embodiment has the same basic configuration as the third embodiment, and therefore differences will be described below. Note that the same reference numerals as those in the third embodiment indicate the same configuration, and reference will be made to the preceding description.

[0242] 21 to 24, the fourth electric work machine 301 according to the fourth embodiment differs from the third electric work machine 201 according to the third embodiment in that it includes a fourth conductive member 355 instead of the third conductive member 255, and that the twelve coils (more specifically, the twelve third coils 234) are configured using two wires (more specifically, the third wire 235 and the fourth wire 236). Like the third electric work machine 201, the fourth electric work machine 301 includes four insulating members 258. [2-4-2. Fourth Conductive Component] As shown in FIGS. 21 to 24, the fourth conduction member 355 includes a fourth U-phase conduction member 355U, a fourth V-phase conduction member 355V, and a fourth W-phase conduction member 355W.

[0243] The fourth U-phase conductor 355U, the fourth V-phase conductor 355V, and the fourth W-phase conductor 355W are arranged on the rear side of the yoke portion 40a of the stator core 40 via the second insulator 52. The fourth U-phase conductor 355U, the fourth V-phase conductor 355V, and the fourth W-phase conductor 355W are formed in shapes that follow part of the annular shape of the yoke portion 40a.

[0244] As will be described later, the fourth U-phase conductive member 355U, the fourth V-phase conductive member 355V, and the fourth W-phase conductive member 355W are stacked from the rear to the front of the electric work machine, electrically insulated from each other by insulating member 258.

[0245] As shown in FIG. 22(a), fourth-phase conduction member 355U includes fourth-phase fixing hole 355U1, fourth-phase extension 355U2, third-phase fusing terminal 355U3, and fourth-phase fusing terminal 355U4. Fourth-phase fixing hole 355U1 includes a hole through which fixing screw 59 can be inserted. Fourth-phase extension 355U2 is formed in a shape that follows a portion of the annular shape of yoke portion 40a. Fourth-phase extension 355U2 electrically connects fourth-phase fixing hole 355U1, third-phase fusing terminal 355U3, and fourth-phase fusing terminal 355U4. The third U-phase fusing terminal 355U3 and the fourth U-phase fusing terminal 355U4 are each connected by fusing to the third wire 235 of the two wires (third wire 235 and fourth wire 236) that make up the twelve third coils 234. In other words, the third U-phase fusing terminal 355U3 and the fourth U-phase fusing terminal 355U4 are each electrically connected to the twelve third coils 234 and the third connecting wire 234a.

[0246] Similar to the second connection wire 134a, the third connection wire 234a is located between one third coil 234 and another third coil 234, and is supported by the first insulator 51 (not shown).

[0247] 22(b), the fourth V-phase conduction member 355V includes a fourth V-phase fixing hole 355V1, a fourth V-phase extension 355V2, a third V-phase fusing terminal 355V3, a fourth V-phase fusing terminal 355V4, and a fifth V-phase fusing terminal 355V5. The fourth V-phase fixing hole 355V1 includes a hole through which a fixing screw 59 can be inserted. The fourth V-phase extension 355V2 is formed in a shape that follows a portion of the annular shape of the yoke portion 40a. The fourth V-phase extension 355V2 electrically connects the fourth V-phase fixing hole 355V1, the third W-phase fusing terminal 355V3, the fourth W-phase fusing terminal 355V4, and the fifth W-phase fusing terminal 355V5.

[0248] Third V-phase fusing terminal 355V3 is connected by fusing to fourth wire 236 of the two wires. Fourth V-phase fusing terminal 355V4 and fifth V-phase fusing terminal 355V5 are connected by fusing to third wire 235 of the two wires. In other words, third V-phase fusing terminal 355V3, fourth V-phase fusing terminal 355V4, and fifth V-phase fusing terminal 355V5 are electrically connected to twelve third coils 234 and third connecting wires 234a, respectively.

[0249] As shown in FIG. 22(c), the fourth W-phase conduction member 355W includes a fourth W-phase fixing hole 355W1, a fourth W-phase extension 355W2, a seventh W-phase fusing terminal 355W3, an eighth W-phase fusing terminal 355W4, and a ninth W-phase fusing terminal 355W5. The fourth W-phase fixing hole 355W1 includes a hole through which a fixing screw 59 can be inserted. The fourth W-phase extension 355W2 is formed in a shape that follows a portion of the annular shape of the yoke portion 40a. The fourth W-phase extension 355W2 electrically connects the fourth W-phase fixing hole 355W1, the seventh W-phase fusing terminal 355W3, the eighth W-phase fusing terminal 355W4, and the ninth W-phase fusing terminal 355W5.

[0250] Seventh W-phase fusing terminal 355W3 and eighth W-phase fusing terminal 355W4 are each connected by fusing to third wire 235 of the two wires. Ninth W-phase fusing terminal 355W5 is connected by fusing to fourth wire 236 of the two wires. In other words, seventh W-phase fusing terminal 355W3, eighth W-phase fusing terminal 355W4, and ninth W-phase fusing terminal 355W5 are each electrically connected to twelve third coils 234 and third connecting wires 234a.

[0251] Although not shown in the figures, the third U-phase fusing terminal 355U3, the fourth U-phase fusing terminal 355U4, the third V-phase fusing terminal 355V3, the fourth V-phase fusing terminal 355V4, the fifth V-phase fusing terminal 355V5, the seventh W-phase fusing terminal 355W3, the eighth W-phase fusing terminal 355W4, and the ninth W-phase fusing terminal 355W5 are each constructed using the plate-shaped member 56 described above.

[0252] 23, the four insulating members 258 are configured to electrically insulate the fourth U-phase conduction member 355U, the fourth V-phase conduction member 355V, and the fourth W-phase conduction member 355W from one another. The four insulating members 258 are configured similarly to the four insulating members 258 of the third embodiment.

[0253] One of the four insulating members 258 is arranged between the fourth V-phase conductor 355V and the fourth W-phase conductor 355W. Another of the four insulating members 258 is arranged between the fourth U-phase conductor 355U and the fourth V-phase conductor 355V. Another of the four insulating members 258 is arranged on the side of the fourth U-phase conductor 355U opposite to the side facing the fourth V-phase conductor 355V. Another of the four insulating members 258 is arranged on the side of the fourth W-phase conductor 355W opposite to the side facing the fourth V-phase conductor 355V.

[0254] In other words, the fourth U-phase conduction member 355U, the fourth V-phase conduction member 355V, the fourth W-phase conduction member 355W and the four insulating members 258 are arranged on the rear side of the yoke portion 40a of the stator core 40 via the second insulator 52.

[0255] The fourth U-phase conductor 355U, the fourth V-phase conductor 355V, and the fourth W-phase conductor 355W are stacked from the rear side to the front side of the electric operating machine, while being electrically insulated from one another by insulating members 258.

[0256] At this time, the insulating member 258 disposed on the front side of the fourth W-phase conduction member 355W is laminated on the second insulator 52 in a manner that makes contact with the second insulator 52. In other words, the insulating member 258 is laminated on the second insulator 52 on the side of the second insulator 52 opposite to the side that faces the stator core 40 in the axial direction of the rotation axis AX.

[0257] The fourth U-phase conductive member 355U, the fourth V-phase conductive member 355V, and the fourth W-phase conductive member 355W are not limited to being stacked in this order from the rear side to the front side of the electric work machine, but may also be stacked in this order from the front side to the rear side.

[0258] Furthermore, the fourth W-phase conduction member 355W is not limited to being stacked on the second insulator 52 without contacting the second insulator 52 via the insulating member 258. For example, the insulating member 258 may be omitted, and the fourth W-phase conduction member 355W may be stacked on the second insulator 52 in contact with the second insulator 52. In other words, the fourth W-phase conduction member 355W may be stacked on the second insulator 52 in contact with the second insulator 52 on a side of the second insulator 52 opposite to a side facing the stator core 40 in the axial direction of the rotation axis AX.

[0259] The assembly process for assembling the fourth U-phase conductor 355U, the fourth V-phase conductor 355V, the fourth W-phase conductor 355W, and the four insulating members 258 together may be a process in which each member is formed individually in advance and then stacked in the configuration described above, as in the third embodiment. Alternatively, the assembly process may be a process in which the fourth U-phase conductor 355U, the fourth V-phase conductor 355V, and the fourth W-phase conductor 355W are placed inside a mold while being spaced apart from each other, and a liquid insulating material is poured into the mold to form the four insulating members 258. [2-4-3. Electrical connection between coil and conductive material] 24, the twelve third coils 234 include a first coil C1, a second coil C2, a third coil C3, a fourth coil C4, a fifth coil C5, a sixth coil C6, a seventh coil C7, an eighth coil C8, a ninth coil C9, a tenth coil C10, an eleventh coil C11, and a twelfth coil C12. The twelve third coils 234 are configured using two wires (a third wire 235 and a fourth wire 236).

[0260] The third wire 235 has a first end 235a and a second end 235b. The third wire 235 starts from the first end 235a and is arranged so that the coils C3, C6, C7, C10, C5, C8, C9, C12, C1, and C4 are arranged in this order before reaching the second end 235b. The fourth wire 236 starts from the first end 236a and is arranged so that the coils C11 and C2 are arranged in this order before reaching the second end 236b.

[0261] Note that the order of arrangement of the wires when forming the plurality of coils C1, C3 to C10, C12 using one third wire 235 is not limited to the above order and may be other orders. The order of arrangement of the wires when forming the plurality of coils C11, C2 using one fourth wire 236 is not limited to the above order and may be coil C2, C11. In other words, the order of forming the plurality of coils C1, C3 to C10, C12 and the order of forming the plurality of coils C11, C2 may be set arbitrarily.

[0262] A first end 235a of the third wire 235 is connected to a third V-phase fusing terminal 355V3. A second end 235b of the third wire 235 is connected to a ninth W-phase fusing terminal 355W5. A first end 236a of the fourth wire 236 is connected to a fifth V-phase fusing terminal 355V5. A second end 236b of the fourth wire 236 is connected to an eighth W-phase fusing terminal 355W4.

[0263] The portion of the third wire 235 between the sixth coil C6 and the seventh coil C7 is connected to a third U-phase fusing terminal 355U3. The portion of the third wire 235 between the tenth coil C10 and the fifth coil C5 is connected to a seventh W-phase fusing terminal 355W3. The portion of the third wire 235 between the eighth coil C8 and the ninth coil C9 is connected to a fifth V-phase fusing terminal 355V5. The portion of the third wire 235 between the twelfth coil C12 and the first coil C1 is connected to a fourth U-phase fusing terminal 355U4.

[0264] The third connecting line 234a corresponds to the following portions of the third wire 235: between the third coil C3 and the sixth coil C6, between the seventh coil C7 and the tenth coil C10, between the fifth coil C5 and the eighth coil C8, between the ninth coil C9 and the twelfth coil C12, and between the first coil C1 and the fourth coil C4. The third connecting line 234a also corresponds to the portion of the fourth wire 236 between the second coil C2 and the eleventh coil C11. [2-4-4. Connecting process between conductive material and coil] A process of connecting the fourth conductive member 355 and the third coil 234 (in other words, the third wire 235 and the fourth wire 236) in the motor 25 of the fourth embodiment will be described.

[0265] First, the fourth conductive member 355 (fourth U-phase conductive member 355U, fourth V-phase conductive member 355V, and fourth W-phase conductive member 355W) is arranged with respect to the assembled first insulator 51, stator core 40, and second insulator 52. Specifically, the fourth conductive member 355 is arranged at a position where it is stacked on the yoke portion 40a with the second insulator 52 interposed therebetween in the axial direction of the rotation axis AX.

[0266] At this time, in terms of their placement positions in the circumferential direction along the annular shape of the yoke portion 40a (in other words, the circumferential direction centered on the rotation axis AX), the 8th W-phase fusing terminal 355W4, the 5th V-phase fusing terminal 355V5, the 3rd V-phase fusing terminal 355V3, and the 9th W-phase fusing terminal 355W5 are placed at different placement positions from each other.

[0267] Furthermore, at this time, the eighth W-phase fusing terminal 355W4, the fifth V-phase fusing terminal 355V5, the third V-phase fusing terminal 355V3, and the ninth W-phase fusing terminal 355W5 are all arranged at the same positions in the axial direction of the rotation axis AX.

[0268] Next, third wire 235 and fourth wire 236 are wound around multiple stator teeth (tooth portion 40b, first tooth 51b, second tooth 52b) to form multiple third coils 234. At this time, midway through the winding of third wire 235, second wire 135 is inserted through plate-like members 56 that respectively constitute fourth U-phase fusing terminal 355U4, fourth V-phase fusing terminal 355V4, seventh W-phase fusing terminal 355W3, and third U-phase fusing terminal 355U3.

[0269] Next, the following operations are performed: connecting the first end 235a to the 8th W-phase fusing terminal 355W4; connecting the second end 235b to the 5th V-phase fusing terminal 355V5; connecting the first end 236a to the 3rd V-phase fusing terminal 355V3; and connecting the second end 236b to the 9th W-phase fusing terminal 355W5.

[0270] First, first end 235a, second end 235b, first end 236a, and second end 236b are inserted through plate-like members 56 that respectively constitute 8W-phase fusing terminal 355W4, 5V-phase fusing terminal 355V5, 3V-phase fusing terminal 355V3, and 9W-phase fusing terminal 355W5. After the insertion, fusing is performed to complete the connection between first end 235a and 8W-phase fusing terminal 355W4, the connection between second end 235b and 5V-phase fusing terminal 355V5, the connection between first end 236a and 3V-phase fusing terminal 355V3, and the connection between second end 236b and 9W-phase fusing terminal 355W5.

[0271] At this time, the first end 235a, the second end 235b, the first end 236a, and the second end 236b are positioned so as to overlap the placement area of ​​the third coil 234 when viewed from a direction perpendicular to the axial direction of the rotation axis AX.

[0272] In this connection operation, any of the first end 235a, the second end 235b, the first end 236a, and the second end 236b may be connected first, and the order from the second end onwards may also be determined arbitrarily. Furthermore, the fusing process may also be performed to connect each of the other fusing terminals to the third wire 235 at the same time.

[0273] In this way, the process of connecting the fourth conductive member 355 and the third coil 234 (in other words, the third wire 235 and the fourth wire 236) is completed. [2-4-5.Effects] (1) According to the fourth embodiment described above, the same effects as those of the third embodiment described above are achieved.

[0274] (2) In the fourth embodiment, the plurality of third coils 234 are configured using two wires (third wire 235, fourth wire 236), and have four ends (first end 235a, second end 235b, first end 236a, second end 236b) as the ends of the wires. The first end 235a, second end 235b, first end 236a, second end 236b are provided in a form that is not stacked on top of each other in the axial direction of the rotation axis AX.

[0275] Therefore, in the motor 25 of this embodiment, when connecting the third wire 235 and the fourth wire 236 to the fourth conductive member 355, the axial dimension of the motor 25 can be reduced compared to when the first end 235a, the second end 235b, the first end 236a, and the second end 236b are stacked in the axial direction.

[0276] Therefore, by providing the fourth electric operating machine 301 with the motor 25 configured in this way, it is possible to prevent the fourth electric operating machine 301 from becoming too large. (3) In this embodiment, the fourth V-phase conduction member 355V is configured to electrically connect the eighth coil C8 and the ninth coil C9. The fourth W-phase conduction member 355W is configured to electrically connect the tenth coil C10 and the eleventh coil C11. This configuration eliminates the need for crossover wires to electrically connect different coils. [2-4-6. Terminology] Third U-phase fusing terminal 355U3, fourth U-phase fusing terminal 355U4, third V-phase fusing terminal 355V3, fourth V-phase fusing terminal 355V4, fifth V-phase fusing terminal 355V5, seventh W-phase fusing terminal 355W3, eighth W-phase fusing terminal 355W4, and ninth W-phase fusing terminal 355W5 each correspond to an example of a connecting portion in the summary of the embodiment. Fourth U-phase fixing hole 355U1, fourth V-phase fixing hole 355V1, and fourth W-phase fixing hole 355W1 correspond to an example of a power receiving portion in the summary of the embodiment.

[0277] Eighth W-phase fusing terminal 355W4 corresponds to an example of a first connection portion in the summary of the embodiments. Fifth V-phase fusing terminal 355V5 corresponds to an example of a second connection portion in the summary of the embodiments. Third V-phase fusing terminal 355V3 corresponds to an example of a first connection portion in the summary of the embodiments. Ninth W-phase fusing terminal 355W5 corresponds to an example of a second connection portion in the summary of the embodiments. [2-5. Other embodiments] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments and can be implemented in various modified forms.

[0278] (a) In the above embodiment, the number of wires forming the multiple coils has been described as one or two, but the present disclosure is not limited to these. For example, the multiple coils may be formed using three or more wires.

[0279] The coils may be configured using two or more wires, but fewer than the number of coils. Even in such a configuration, by applying the present disclosure, it is possible to prevent both ends of the wires (in other words, the first end and the second end) from being stacked in the axial direction.

[0280] (b) In the above embodiment, the number of coils is described as six and twelve, but the present disclosure is not limited to these. For example, the number of coils may be an integer multiple of three.

[0281] (c) In the above embodiments, a three-phase brushless motor with 8 poles and 6 slots and a three-phase brushless motor with 8 poles and 12 slots have been described as brushless motors, but the motors of the present disclosure are not limited to these configurations. For example, the motors of the present disclosure may have any number of poles (i.e., magnets). The motors of the present disclosure may have any number of teeth (i.e., slots). The motors of the present disclosure may have, for example, a 12-pole, 9-slot configuration (12 magnets, 9 coils). Alternatively, the motors of the present disclosure may have a 4-pole, 6-slot configuration.

[0282] (d) Multiple functions achieved by one component in the above embodiments may be achieved by multiple components, and one function achieved by one component may be achieved by multiple components. Also, 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. Also, part of the configuration of the above embodiments may be omitted. Also, 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]

[0283] 1...electric work machine, 20...motor unit, 25...motor, 30...stator, 34...coil, 34U1, 34U2...U-phase coil, 34V1, 34V2...V-phase coil, 34W1, 34W2...W-phase coil, 34a...connecting wire, 35...wire, 35a...first end, 35b...second end, 40...stator core, 40a...yoke portion, 40b...teeth portion, 55...conductive member, 55U...U-phase conductive member, 55U3...U-phase fusing terminal, 5 5V...V-phase conductive member, 55V3...V-phase fusing terminal, 55W...W-phase conductive member, 55W3, 55W4...W-phase fusing terminal, 56...plate-shaped member, 56a...closed end, 56b...open end, 62a...Hall sensor, 63...screw, 101...second electric operating machine, 134...second coil, 134a...second connecting wire, 135...second wire, 135a...first end, 135b...second end, 155...second conductive member, 155W...W-phase conductive member, 15 5W3, 155W4...W-phase fusing terminal, 201...third electric work machine, 234...third coil, 234a...third connecting wire, 235...third wire, 235a...first end, 235b...second end, 236...fourth wire, 236a...first end, 236b...second end, 255...third conductive member, 255U...U-phase conductive member, 255U3, 255U4, 255U5...U-phase fusing terminal, 255V...V-phase conductive member, 255V3, 255 V4...V-phase fusing terminal, 255W...W-phase conductive member, 255W3, 255W4...W-phase fusing terminal, 301...fourth electric work machine, 355...fourth conductive member, 355U...U-phase conductive member, 355U3, 355U4...U-phase fusing terminal, 355V...V-phase conductive member, 355V3, 355V4, 355V5...V-phase fusing terminal, 355W...W-phase conductive member, 355W3, 355W4, 355W5...phase fusing terminal.

Claims

1. a brushless motor including a rotor configured to rotate about a rotation axis and a stator disposed outside the rotor; a housing configured to house the brushless motor; An electric work machine comprising: The stator includes: a stator core including an annular yoke arranged to surround the rotor and a plurality of teeth configured to protrude radially inward from the yoke; an insulating insulator configured to cover at least a portion of the stator core; a plurality of coils each including a wire wound around each of the plurality of teeth via the insulator; a conductive member including a connection portion connected to the wire and a power receiving portion receiving power for energizing the plurality of coils; Equipped with the wire having a first end and a second end; the conductive member is disposed at a position where it is stacked on the yoke with the insulator interposed therebetween in the axial direction of the rotating shaft, the connection portion of the conductive member includes a first connection portion connected to the first end portion and a second connection portion connected to the second end portion, With respect to the arrangement position in the circumferential direction along the annular shape of the yoke, the arrangement position of the first connection portion is different from the arrangement position of the second connection portion, With respect to the arrangement position in the axial direction, the arrangement position of the first connection portion is the same as the arrangement position of the second connection portion, the first end and the second end are arranged so as to overlap with an arrangement area of ​​the coil when viewed from a direction perpendicular to the axial direction; Electric work equipment.

2. The electric operating machine according to claim 1, the first connecting portion and the second connecting portion are each configured using a plate-like member bent so as to have a U-shaped cross section, and are arranged so that a first extension direction connecting an open end and a closed end of the U-shape is parallel to the axial direction, the first connection portion is connected to the first end portion with the first end portion disposed inside the U-shape; the second connection portion is connected to the second end portion with the second end portion disposed inside the U-shape; Electric work equipment.

3. The electric operating machine according to claim 1, the first connection portion is disposed so that the teeth are present between the first connection portion and the second connection portion in a circumferential direction along the annular shape of the yoke; Electric work equipment.

4. The electric operating machine according to claim 1, the first connection portion is disposed at a position where the teeth are not present between the first connection portion and the second connection portion in a circumferential direction along the annular shape of the yoke; Electric work equipment.

5. The electric operating machine according to claim 1, The wires forming the plurality of coils are composed of a single first wire. Electric work equipment.

6. The electric operating machine according to claim 1, The plurality of coils are configured using two or more wires, the number of which is less than the number of the coils. Electric work equipment.

7. The electric operating machine according to claim 1, a rotation detection unit configured to detect a rotation state of the rotor, the rotation detection unit is disposed on an opposite side of the stator core from an arrangement position of the conductive member in the axial direction; Electric work equipment.

8. The electric operating machine according to claim 1, the first connection portion and the second connection portion are arranged in a region overlapping with the stator core when viewed from the axial direction; Electric work equipment.

9. The electric operating machine according to claim 1, The conductive member is configured to electrically connect different coils among the plurality of coils. Electric work equipment.

10. The electric operating machine according to claim 1, The stator includes the plurality of coils, the number of which is an integer multiple of 3. Electric work equipment.

11. The electric operating machine according to claim 10, The rotor includes a rotor core and a plurality of permanent magnets fixed to the rotor core, The number of poles, which indicates the number of the permanent magnets, is 8; The number of slots representing the number of coils is 6. Electric work equipment.

12. a brushless motor including a rotor configured to rotate about a rotation axis and a stator disposed outside the rotor; a housing configured to house the brushless motor; An electric work machine comprising: The stator includes: a stator core including an annular yoke arranged to surround the rotor and a plurality of teeth configured to protrude radially inward from the yoke; an insulating insulator configured to cover at least a portion of the stator core; a plurality of coils each including a wire wound around each of the plurality of teeth via the insulator; a conductive member including a connection portion connected to the wire and a power receiving portion receiving power for energizing the plurality of coils; Equipped with the wire having a first end and a second end; the conductive member is laminated on the insulator in a manner of being in contact with or not in contact with the insulator, on a side of the insulator opposite to a side facing the stator core in an axial direction of the rotating shaft, the connection portion of the conductive member includes a first connection portion connected to the first end portion and a second connection portion connected to the second end portion, With respect to the arrangement position in the circumferential direction along the annular shape of the yoke, the arrangement position of the first connection portion is different from the arrangement position of the second connection portion, With respect to the arrangement position in the axial direction, the arrangement position of the first connection portion is the same as the arrangement position of the second connection portion, the first end and the second end are arranged so as to overlap with an arrangement area of ​​the coil when viewed from a direction perpendicular to the axial direction; Electric work equipment.

13. The electric operating machine according to claim 12, the first connecting portion and the second connecting portion are each configured using a plate-like member bent so as to have a U-shaped cross section, and are arranged so that a first extension direction connecting an open end and a closed end of the U-shape is parallel to the axial direction, the first connection portion is connected to the first end portion with the first end portion disposed inside the U-shape; the second connection portion is connected to the second end portion with the second end portion disposed inside the U-shape; Electric work equipment.

14. The electric operating machine according to claim 12, the first connection portion is disposed so that the teeth are present between the first connection portion and the second connection portion in a circumferential direction along the annular shape of the yoke; Electric work equipment.

15. The electric operating machine according to claim 12, the first connection portion is disposed at a position where the teeth are not present between the first connection portion and the second connection portion in a circumferential direction along the annular shape of the yoke; Electric work equipment.

16. The electric operating machine according to claim 12, The wires forming the plurality of coils are composed of a single first wire. Electric work equipment.

17. The electric operating machine according to claim 12, The plurality of coils are configured using two or more wires, the number of which is less than the number of the coils. Electric work equipment.

18. The electric operating machine according to claim 12, a rotation detection unit configured to detect a rotation state of the rotor, the rotation detection unit is disposed on an opposite side of the stator core from an arrangement position of the conductive member in the axial direction; Electric work equipment.

19. The electric operating machine according to claim 12, the first connection portion and the second connection portion are arranged in a region overlapping with the stator core when viewed from the axial direction; Electric work equipment.

20. The electric operating machine according to claim 12, The conductive member is configured to electrically connect different coils among the plurality of coils. Electric work equipment.

Images