Electric working machine and method for manufacturing outer rotor motor to be mounted on electric working machine

Abstract

To provide an electric working machine including an outer rotor type motor in which a stator is appropriately fixed.SOLUTION: The electric working machine includes an outer rotor type motor and a power transmission unit. The motor includes a rotor, a stator, a stator support portion, and a first bearing. The stator includes a coil and a through hole. The through hole is penetrated by the shaft. (i) has a cylindrical shape, (ii) is inserted into the through hole, and (iii) the stator is fixed to the stator support portion in a first fixing manner. The first fixing mode is a mode in which a screw is not used, and deformation of the inner circumferential surface of the stator support portion based on the stator being fixed to the stator support portion does not occur.SELECTED DRAWING: Figure 6

Description

[Technical Field]

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

[0002] Patent Document 1 discloses an outer rotor brushless motor, in which a stator and a bearing are fixed to a stator base. [Prior art documents] [Patent documents]

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

[0004] One method for fixing a stator to a stator base is to press-fit the stator into the stator base. However, the pressure applied when the stator is press-fitted into the stator base can deform the stator base. If the stator base is deformed in this way, the accuracy of the bearing's axis alignment can decrease when fixing a bearing to the stator base, which can shorten the bearing's lifespan and / or cause a failure of the brushless motor.

[0005] An object of one aspect of the present disclosure is to provide an electric working machine including an outer rotor type motor in which a stator is appropriately fixed. [Means for solving the problem]

[0006] 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.

[0007] One aspect of the present disclosure provides an electric work machine including a motor and a power transmission unit. The motor is an outer rotor type. The power transmission unit is configured to have a driven tool attached thereto or to allow the driven tool to be detachably attached thereto. The power transmission unit is configured to transmit rotation of the motor to the driven tool to drive the driven tool.

[0008] The motor includes a rotor, a stator, a stator support, and a first bearing. The rotor (i) includes a rotor core and a shaft, and (ii) is configured to rotate to drive a driven tool via a power transmission unit. The rotor core has a cylindrical shape and includes a magnet.

[0009] The stator is disposed on the inner circumferential side of the rotor core and includes a coil and a through hole through which the shaft passes. The stator support portion (i) has a cylindrical shape, (ii) is inserted into the through hole, and (iii) the stator is fixed to the stator support portion in a first fixing manner, thereby supporting the stator. The first fixing manner is a manner in which no screws are used and no deformation of the inner circumferential surface of the stator support portion occurs when the stator is fixed to the stator support portion.

[0010] The first bearing (i) is fixed to the stator support portion within the stator support portion, and (ii) rotatably supports the shaft. In the electric working machine configured in this manner, the stator can be appropriately fixed to the stator support portion.

[0011] Another aspect of the present disclosure provides an electric working machine including a motor and the power transmission unit described above. The motor is an outer rotor type. The motor includes the rotor described above, the stator described above, and a stator support portion.

[0012] The stator support portion (i) has a cylindrical shape, (ii) is inserted into the through hole, and (iii) the stator is adhesively fixed to the stator support portion with an adhesive, thereby supporting the stator.

[0013] In the electric working machine configured in this manner, the stator can be appropriately fixed to the stator support portion. Yet another aspect of the present disclosure provides a method for manufacturing an outer rotor motor to be mounted on an electric working machine.

[0014] The method includes fixing a stator to a stator support portion in a predetermined fixing manner. The stator support portion has a cylindrical shape. The fixing includes inserting the stator support portion into a through hole of the stator. The stator support portion and the through hole are configured to allow a shaft of the rotor to pass through. The predetermined manner is a manner in which no screws are used and no deformation of the inner circumferential surface of the stator support portion occurs due to fixing of the stator to the stator support portion.

[0015] The method further comprises inserting a bearing within the stator support and securing the bearing to the stator support, the bearing configured to rotatably support the shaft.

[0016] In this manner, the stator can be properly fixed to the stator support. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a perspective view of an electric work machine according to an exemplary embodiment; [Figure 2]FIG. 2 is a first perspective view of a motor and a controller in an electric working machine. [Figure 3] FIG. 2 is a first exploded perspective view of the motor. [Figure 4] FIG. 2 is a second perspective view of the motor. [Figure 5] FIG. 2 is a second exploded perspective view of the motor. [Figure 6] 1 is a cross-sectional view of the motor taken along a plane parallel to the right and forward directions and passing through the rotation axis AX. [Figure 7] FIG. 2 is an exploded perspective view of a stator base, a stator core, and a first bearing. [Figure 8] FIG. [Figure 9] 2 is a cross-sectional view of the stator base, the stator core, and the first bearing, taken along a plane perpendicular to the rotation axis AX and passing through the first bearing. FIG. [Figure 10] FIG. 10A shows a first modified example of a stator base and a stator core, and FIG. 10B shows a second modified example of a stator base and a stator core. DETAILED DESCRIPTION OF THE INVENTION

[0018] [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: · Feature 1: Outer rotor type motor. Feature 2: A power transmission unit (or power transmission mechanism or power output unit or power output mechanism or drive mechanism or drive unit) configured to have a driven tool attached or to allow the driven tool to be detachably attached, and configured to transmit rotation of the motor to the driven tool to drive the driven tool. · Feature 3: The motor has a rotor. Feature 4: The rotor has a rotor core. Feature 5: The rotor has a shaft. Feature 6: The rotor is configured to rotate to drive a driven tool via a power transmission unit. Feature 7: The rotor core has a cylindrical shape. Feature 8: The rotor core includes a magnet. Feature 9: The motor has a stator. Feature 10: The stator is located on the inner periphery of the rotor core. Feature 11: The stator includes a coil. Feature 12: The stator has a through hole through which the shaft passes. Feature 13: The motor includes a stator support. Feature 14: The stator support portion has a cylindrical shape. Feature 15: The stator support portion is inserted into the through hole. Feature 16: The stator support portion supports the stator by fixing the stator in a first fixing manner. Feature 17: The first fixing method does not use screws. Feature 18: The first fixing mode is a mode in which the inner circumferential surface of the stator support portion is not deformed due to the stator being fixed to the stator support portion. That is, the inner circumferential surface of the stator support portion does not have deformation (or deformed portion) due to the stator being fixed to the stator support portion. Feature 19: The motor includes a first bearing. Feature 20: The first bearing is fixed to the stator support portion inside the stator support portion. Feature 21: The first bearing rotatably supports the shaft.

[0019] In an electric operating machine having at least the features 1 to 21, the stator can be appropriately fixed to the stator support portion. A supplementary note on the above-mentioned feature 18. The "deformation" here may refer to deformation of the inner circumferential surface of the stator support portion from an initial state. The initial state is before the stator is fixed to the stator support portion (i.e., a state in which the stator is separated from the stator support portion). The "deformation" may be caused by pressure being applied to the stator support portion by the stator when the stator is fixed to the stator support portion. The "deformation" may include plastic deformation.

[0020] The stator support portion may fix the stator without receiving pressure of a predetermined magnitude or more from the stator. In other words, the stator support portion may fix the stator in a manner other than receiving pressure from the stator (in other words, applying pressure to the stator).

[0021] The shaft may be fixed directly or indirectly to the rotor core and configured to rotate integrally with the rotor core. The shaft may pass through the stator support. The shaft may be directly or indirectly connected to a power transmission section and configured to transmit rotation of the shaft to the power transmission section.

[0022] The first bearing may be fixed to the stator support in any manner. The first bearing may be fixed in a manner similar to the first fixing manner. Specifically, the first bearing may be fixed in a manner similar to the first fixing manner. The first bearing may be fixed to the stator support portion in a manner that does not cause deformation of the outer peripheral surface of the stator support portion due to the first bearing being fixed to the stator support portion. Alternatively, the first bearing may be fixed in a manner similar to the second fixing manner described below. Specifically, the first bearing may be fixed to the stator support portion in a manner that causes deformation of the outer peripheral surface of the stator support portion due to the first bearing being fixed to the stator support portion. More specifically, the first bearing may be fixed by being press-fitted into the stator support portion, for example. In this case, the outer peripheral surface of the stator support portion may have deformation caused when the first bearing is press-fitted into the stator support portion.

[0023] Some embodiments may include at least one of the following in addition to or instead of at least one of Features 1 to 21 above. Feature 22: The first bearing is fixed to the stator support portion in a second fixing manner. Feature 23: The second fixing mode is a mode in which deformation of the stator support portion occurs (or can occur, or may occur, or is highly likely to occur) due to fixing the first bearing to the stator support portion. That is, the stator support portion has or can have deformation (or a deformed portion) due to fixing the first bearing to the stator support portion.

[0024] In an electric operating machine having at least Features 1 to 23, the first bearing can be easily fixed to the stator support portion. Some embodiments may include the following in addition to or instead of at least one of features 1-23 above. Feature 24: The second fixing method includes press-fitting.

[0025] In an electric operating machine having at least Features 1 to 24, the first bearing can be easily and stably fixed to the stator support portion. The second fixing manner may include a manner other than press-fitting. The second fixing manner may include, for example, shrink fitting. Shrink fitting may be performed, for example, as follows: First, the stator is heated to expand the inner diameter of the through hole. Next, the stator support portion is inserted into the through hole. After that, the temperature of the stator is lowered to room temperature, thereby reducing the inner diameter of the through hole compared to when it was heated. As a result, pressure is applied from the stator support portion to the inner circumferential surface of the through hole (i.e., the inner circumferential surface of the stator described below), and the stator is fixed to the stator support portion.

[0026] The second fixing method may include, for example, cold fitting. Cold fitting may be performed, for example, as follows: First, the stator support portion is cooled to reduce the outer diameter of the stator support portion. Next, the stator support portion is inserted into the through-hole. After that, the temperature of the stator support portion is increased to return it to room temperature, thereby increasing the outer diameter of the stator support portion compared to when it was cooled. This applies pressure from the stator support portion to the inner peripheral surface of the stator, fixing the stator to the stator support portion.

[0027] Some embodiments may include the following in addition to or instead of at least one of features 1-24 above. Feature 25: The first fixing method includes adhesive fixing using an adhesive.

[0028] In an electric working machine having at least features 1 to 21 and 25, the stator can be fixed to the stator support portion (i) without deforming the inner surface of the stator support portion, (ii) easily, and (iii) stably.

[0029] The adhesive may have any form. For example, the adhesive may be an acrylic adhesive. More specifically, the adhesive may be a liquid-mixing adhesive or a liquid anaerobic adhesive.

[0030] The adhesive may be applied, infiltrated, or filled in the stator support portion and / or the stator in any manner. For example, the adhesive may first be applied to the outer peripheral surface of the stator support portion. Then, the stator support portion may be inserted into the through hole of the stator. This allows the adhesive to infiltrate the space between the outer peripheral surface of the stator support portion and the inner peripheral surface of the through hole (hereinafter referred to as the "infiltration space"), and the stator is fixed to the stator support portion by the adhesive. Specifically, the inner peripheral surface of the through hole is fixed to the outer peripheral surface of the stator support portion via the adhesive.

[0031] The first fixing manner may be a manner other than adhesive fixing using an adhesive. Some embodiments may include at least one of the following in addition to or instead of at least one of features 1 to 25 above. Feature 26: First recess and / or second recess. Feature 27: The first recess is located on the inner peripheral surface of the stator. The inner peripheral surface of the stator corresponds to the inner peripheral surface of the through hole. Feature 28: The first recess is filled with a first portion of the adhesive. Feature 29: The second recess is on the outer peripheral surface of the stator support portion, which faces the inner peripheral surface of the stator. Feature 30: The second recess is filled with a second portion of the adhesive.

[0032] In an electric operating machine having at least Features 1 to 21 and 25 to 30, a larger amount of adhesive can be infiltrated into the wetting space, particularly into the first recess and / or the second recess, allowing an appropriate amount of adhesive to infiltrate into the wetting space, thereby stably fixing the stator to the stator support portion.

[0033] Some embodiments may include at least a first recess. Some embodiments may include at least one of the following in addition to or instead of at least one of Features 1-30 above. Feature 31: The through hole has an opening through which the shaft protrudes. Feature 32: The first recessed portion extends from the opening on the inner peripheral surface of the stator along the rotation axis of the shaft.

[0034] In an electric working machine having at least features 1 to 21 and 25 to 32, a large amount of adhesive can be infiltrated into the infiltration space over a long range along the axial direction, thereby enabling the stator to be more stably fixed to the stator support portion.

[0035] 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 inner peripheral surface of the stator has a first flat area. Feature 34: The outer peripheral surface of the stator support portion, which faces the inner peripheral surface of the stator, has a second flat area. Feature 35: The second planar area faces the first planar area.

[0036] In an electric operating machine having at least the features 1 to 21 and 33 to 35, it is possible to suppress or prevent the stator from rotating relative to the stator support portion. A part or all of the second planar region may face the first planar region, a part or all of the second planar region may contact the first planar region, or the second planar region may contact the first planar region directly or indirectly (e.g., via an adhesive).

[0037] The inner peripheral surface of the stator may have a first flat surface region and a first curved surface region. The first curved surface region may be a part or all of the region of the inner peripheral surface of the stator other than the first flat surface region. The outer peripheral surface of the stator support part may have a second flat surface region and a second curved surface region. The second curved surface region may be a part or all of the region of the outer circumferential surface other than the second flat surface region.

[0038] 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: A second bearing separate from the first bearing. Feature 37: The second bearing is fixed to the stator support portion inside the stator support portion. Feature 38: The second bearing rotatably supports the shaft.

[0039] In an electric operating machine having at least the features 1 to 21 and 36 to 38, the shaft can be stably supported. Some embodiments may include at least one of the following in addition to or instead of at least one of features 1-38 above. Feature 39: The first bearing at least partially overlaps with the stator in the axial direction. The axial direction is along the rotation axis of the shaft and is parallel to the rotation axis. That is, the area where the first bearing exists and the area where the stator exists in the axial direction at least partially overlap with each other. In other words, the first bearing and the stator directly or indirectly face each other at least partially in a direction perpendicular to the axial direction. Feature 40: The second bearing does not overlap with the stator in the axial direction. That is, the area where the second bearing exists and the area where the stator exists do not overlap in the axial direction. In other words, the second bearing and the stator do not directly or indirectly face each other in a direction perpendicular to the axial direction.

[0040] In an electric operating machine having at least Features 1 to 21 and 36 to 40, the first bearing is disposed close to the stator, which allows for a reduction in the size of the motor and therefore the size of the electric operating machine.

[0041] 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 shaft has a first surface configured to be contacted by the first bearing. Feature 42: The shaft includes a second surface configured for contact with the second bearing. Feature 43: The axial length of the first surface is longer than the axial length of the second surface.

[0042] In an electric operating machine having at least the features 1 to 21 and 36 to 43, the shaft can be stably supported by the first bearing. Some embodiments may include the following in addition to or instead of at least one of features 1-43 above. Feature 44: The first bearing is in the form of a needle roller bearing.

[0043] In an electric operating machine having at least Features 1 to 21 and 44, it is possible to prevent the first bearing from becoming large, which makes it possible to reduce the size of the motor and, in turn, the size of the electric operating machine. The first bearing may be of a type different from a needle roller bearing. The first bearing may be, for example, a roller bearing of a type different from a needle roller bearing. The first bearing may be, for example, a rolling bearing (for example, a ball bearing) of a type different from a roller bearing. The first bearing may be of a type different from a rolling bearing (for example, a sliding bearing).

[0044] The second bearing may have any form. The second bearing may be in the form of a rolling bearing. Specifically, the second bearing may be, for example, a ball bearing or a roller bearing. The second bearing may be in a form other than a rolling bearing (for example, a plain bearing).

[0045] Some embodiments may include at least one of the following in addition to or instead of at least one of Features 1-44 above. · Feature 45: The enclosure (or housing) that contains the motor. Feature 46: A mounting portion that directly or indirectly fixes the stator support portion to the housing.

[0046] In an electric operating machine having at least the features 1 to 21, 45, and 46, the motor can be stably fixed to the housing. Some embodiments may include the following in addition to or instead of at least one of features 1-46 above. Feature 47: The mounting portion is integrally formed with the stator support portion.

[0047] In an electric operating machine having at least the features 1 to 21 and 45 to 47, the motor can be efficiently fixed to the housing. Some embodiments may include at least one of the following in addition to or instead of at least one of Features 1-47 above. Feature 48: The stator support includes an aluminum alloy. Feature 49: At least a portion of the stator, including the through hole, includes electromagnetic steel (or an electromagnetic steel sheet).

[0048] In an electric operating machine having at least the features 1 to 21, 48, and 49, it is possible to reduce the weight of the stator support portion (and thus the weight of the motor). If the stator support part (including aluminum alloy) is press-fitted into the through-hole of the stator (including electromagnetic steel), the outer circumferential surface of the stator support part may be damaged by the pressure from the stator. Therefore, when the stator support part is press-fitted into the stator, it is not easy to use aluminum alloy as the material for the stator support part.

[0049] However, in the present disclosure, the stator is fixed to the stator support portion using the first fixing method. Therefore, damage to the stator support portion when the stator is fixed to the stator support portion is suppressed or prevented. This makes it easy to use an aluminum alloy as the material for the stator support portion, thereby enabling a reduction in the weight of the motor.

[0050] The stator support portion may contain any amount of aluminum alloy, and the aluminum alloy may contain any amount of aluminum. The stator support may comprise a metal other than an aluminum alloy (or a non-ferrous metal).

[0051] The stator may include a stator core. The above-mentioned "at least a portion including a through hole" may correspond to the stator core. That is, the stator core may include a through hole. At least a portion or all of the stator core may include electromagnetic steel (or electromagnetic steel sheets). The stator core may be configured by laminating multiple electromagnetic steel sheets. The stator core may include a magnetic material other than electromagnetic steel (e.g., a soft magnetic material).

[0052] The stator core may include a core back (or a yoke). The core back has a substantially cylindrical shape. The stator core may include a plurality of teeth. The core back and the teeth may be integrally formed of electromagnetic steel. The stator may include an insulator that at least partially covers the stator core and that covers at least portions of the teeth around which the coils are wound.

[0053] An embodiment may provide an electric power operating machine (or an electric tool, an electric mechanical implement, or a field device) having at least one of the features 1 to 15 above and the feature 50 below. Feature 50: The stator support portion supports the stator by adhesively fixing the stator to the stator support portion. In other words, the stator support portion is adhesively fixed to the stator by adhesive.

[0054] In an electric operating machine having at least the features 1 to 15 and 50, the stator can be appropriately fixed to the stator support portion. An embodiment may provide a method including at least one of the following features. This method is a method for manufacturing an outer rotor type motor to be mounted on an electric work machine. Feature 51: Fixing the stator to the stator support in a predetermined fixing manner. Feature 52: The fixing step includes inserting the stator support into a through hole of the stator. Feature 53: The stator support portion has a cylindrical shape. Feature 54: The stator support portion and the through hole are configured so that the rotor shaft passes through them. Feature 55: The predetermined configuration does not use screws. Feature 56: In the predetermined mode, the inner circumferential surface of the stator support portion is not deformed when the stator is fixed to the stator support portion. That is, the inner circumferential surface of the stator support portion is not deformed when the stator is fixed to the stator support portion. Feature 57: The bearing is inserted into the stator support and fixed to the stator support. Feature 58: The bearing is configured to rotatably support the shaft.

[0055] According to a method including at least the features 51 to 58, the stator can be properly fixed to the stator support portion. Examples of such motors include brushless motors (including brushless DC motors and / or brushless AC motors), brushed DC motors, AC motors, and stepper motors.

[0056] 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.

[0057] Examples of the power tools mentioned above include electric chainsaws, electric handy 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 planes, electric nail guns (including tack guns), 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. Includes:

[0058] 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.

[0059] In some embodiments, the above features 1 to 58 may be combined in any manner. In some embodiments, any of the above features 1-58 may be omitted. 2. SPECIFIC EXEMPLARY EMBODIMENTS A specific exemplary embodiment will be described below. This specific exemplary embodiment provides an electric work machine 1 in the form of an electric chainsaw. However, this electric work machine 1 is merely an example, and the present disclosure may be applied to any form of electric work machine.

[0060] [2-1. Overall configuration of electric work equipment] As shown in Fig. 1, the electric work machine 1 includes a housing (or enclosure) 2. The housing 2 is made of synthetic resin. The housing 2 accommodates a motor 6 therein. The housing 2 accommodates a controller 11 therein.

[0061] For ease of explanation, in this embodiment, the directions of "up," "down," "right," "left," "front," and "rear" are defined with the electric working machine 1 at the center, as shown in Figure 1 and subsequent figures. The electric working machine 1 is provided with a guide bar 9. The guide bar 9 is a plate-shaped member. The guide bar 9 protrudes from the housing 2 to the front of the electric working machine 1.

[0062] The electric work machine 1 includes a saw chain 10. The saw chain 10 includes a plurality of cutters connected to one another. The saw chain 10 is removably attached to the periphery of a guide bar 9.

[0063] The electric work machine 1 includes a power transmission unit 13. The power transmission unit 13 is directly or indirectly connected to a rotor shaft 50 (see FIG. 2 ) of the motor 6. The saw chain 10 is connected to the motor 6 via the power transmission unit 13. The power transmission unit 13 includes a sprocket (not shown) configured to have the saw chain 10 attached thereto. The power transmission unit 13 transmits the rotation of the motor 6 (more specifically, the rotation of the rotor shaft 50) to the saw chain 10, thereby driving the saw chain 10.

[0064] Therefore, when the motor 6 is driven, the saw chain 10 moves around the periphery of the guide bar 9. The electric work machine 1 can cut the workpiece with the moving saw chain 10.

[0065] The electric work machine 1 is equipped with a battery mounting portion 5. In this embodiment, the battery mounting portion 5 protrudes upward from the rear of the housing 2. A battery pack 12 is detachably mounted to the battery mounting portion 5. The battery pack 12 can be attached to the rear end face of the battery mounting portion 5. The battery pack 12 includes a secondary battery, for example, a rechargeable lithium-ion battery. When attached to the battery mounting portion 5, the battery pack 12 can supply power to the electric work machine 1. The motor 6 receives power from the battery pack 12 via the controller 11 and is driven by the power.

[0066] The electric working machine 1 is provided with a hand guard 4. The hand guard 4 protrudes upward from the front of the housing 2. The electric work machine 1 has a side handle 3A and a top handle 3B behind the hand guard 4. One of the side handle 3A and the top handle 3B may be omitted. The side handle 3A and the top handle 3B are made of synthetic resin.

[0067] The side handle 3A is a pipe-shaped member that protrudes leftward from the left part of the housing 2. Therefore, the operator of the electric working machine 1 can grip the side handle 3A with his / her left hand from behind the electric working machine 1.

[0068] The top handle 3B protrudes upward from the top of the housing 2. The rear end of the top handle 3B is connected to the battery attachment section 5, which forms a space between the top handle 3B and the housing 2. Therefore, the operator can insert his or her fingers into this space to grip the top handle 3B.

[0069] The electric work machine 1 is provided with a trigger switch 7 below the top handle 3B. The trigger switch 7 is operated (for example, pulled) by the operator to drive the motor 6. When the trigger switch 7 is pulled upward by the operator, the motor 6 is driven. When the operation of the trigger switch 7 is released, the driving of the motor 6 is stopped.

[0070] The electric work machine 1 is provided with a trigger lock lever 8 above the top handle 3B. When the trigger lock lever 8 is pressed downward by the operator, operation of the trigger switch 7 is permitted.

[0071] The specific configuration of the motor 6 will be described below with reference to FIGS. [2-2. Specific motor configuration] In this embodiment, the motor 6 is in the form of an outer rotor brushless motor.

[0072] 2 to 6, the motor 6 includes a rotor 20. The motor 6 includes a stator 30. The rotor 20 is disposed on the outer periphery of the stator 30 and rotates around the stator 30 .

[0073] The motor 6 includes a rotor shaft 50. The rotor shaft 50 is fixed to the rotor 20. The central axis of the rotor shaft 50 coincides with the rotation axis AX of the motor 6. Therefore, the rotor 20 and the rotor shaft 50 rotate about the rotation axis AX.

[0074] The motor 6 includes a sensor board 60. The sensor board 60 includes three magnetic sensors 62 that detect the rotation of the rotor 20. The motor 6 includes a stator base 40. The stator base 40 supports the stator 30 and the sensor board 60.

[0075] The motor 6 includes an insulating member 70. The insulating member 70 is disposed between the stator base 40 and the stator 30. The insulating member 70 has a hollow disk shape. A second support portion 41B, which will be described later, is inserted into the inner hole of the insulating member 70 (see FIG. 6).

[0076] The rotor shaft 50 passes through the stator 30, the insulating member 70, and the stator base 40 from the rotor 20 and protrudes to the outside. The rotor shaft 50 is provided with an output shaft 51. The output shaft 51 corresponds to a part of the rotor shaft 50 that includes the first end protruding to the outside from the stator base 40. The output shaft 51 is directly or indirectly connected to the power transmission unit 13. The rotor shaft 50 drives the saw chain 10 via the power transmission unit 13.

[0077] The main components of the motor 6, including the rotor 20, the stator 30, and the stator base 40, will be described in more detail below with reference to FIGS. [2-2-1. Rotor] The rotor 20 includes a rotor cup 21. The rotor cup 21 is made of metal. Specifically, the rotor cup 21 contains aluminum, which is a non-magnetic material, as its main component.

[0078] The rotor cup 21 includes a plate portion 21A. The plate portion 21A has an annular shape. The plate portion 21A includes an opening 21C in its center. The rotor shaft 50 is inserted into the opening 21C and fixed therein. The rotor shaft 50 may be fixed to the rotor cup 21 by any method. In this embodiment, the rotor shaft 50 is press-fitted into the opening 21C and thereby fixed to the opening 21C (and thus to the rotor cup 21).

[0079] The rotor cup 21 includes a yoke portion 21B. The yoke portion 21B has a cylindrical shape. The yoke portion 21B surrounds the rotor shaft 50. The rotor cup 21 includes a plurality of fins 21D between the plate portion 21A and the yoke portion 21B. The yoke portion 21B is connected to the outer periphery of the plate portion 21A via the plurality of fins 21D. The plurality of fins 21D are arranged at equal intervals along the outer periphery of the plate portion 21A. The plurality of fins 21D rotate together with the plate portion 21A (in other words, the rotor 20), thereby generating wind. The wind cools the motor 6.

[0080] As shown in FIGS. 4 to 6, the rotor 20 includes a rotor core 22. The rotor core 22 includes a plurality of steel plates laminated in a direction along the rotation axis AX (hereinafter referred to as the "axial direction"). The rotor core 22 has a substantially cylindrical shape. The rotor core 22 is supported on the inner circumferential surface of the yoke portion 21B of the rotor cup 21.

[0081] As shown in FIGS. 4 to 6 , the rotor 20 includes a plurality of magnets 23. Each of the plurality of magnets 23 is a permanent magnet. Each of the plurality of magnets 23 has a plate-like shape. In this embodiment, each of the plurality of magnets 23 is in the form of a sintered magnet. The plurality of magnets 23 are arranged on the inner peripheral surface of the rotor core 22 at intervals from one another along the circumferential direction. The plurality of magnets 23 are each fixed to the inner peripheral surface of the rotor core 22 by, for example, an adhesive. In this embodiment, the plurality of magnets 23 includes, for example, 12 magnets 23. The plurality of magnets 23 are arranged on the inner peripheral surface of the rotor core 22 so that north poles and south poles appear alternately along the circumferential direction.

[0082] [2-2-2. Stator] The stator 30 is disposed on the inner peripheral side of the rotor core 22. That is, the stator 30 is disposed so as to face the plurality of magnets 23 in the radial direction. The radial direction is a direction perpendicular to the rotation axis AX.

[0083] 3, 5, and 6, the stator 30 includes a stator core 31. The stator core 31 is made of electromagnetic steel. The stator core 31 includes a plurality of steel plates stacked in the axial direction.

[0084] The stator core 31 includes a yoke (or stator back) 31A. The yoke 31A has a cylindrical shape. Specifically, as shown in FIG. 6, the yoke 31A includes a through hole 310. The stator base 40 is inserted into the through hole 310, and the rotor shaft 50 is inserted into the stator base 40. In other words, the rotor shaft 50 passes through the through hole 310 via the stator base 40. The central axis ( That is, the central axis of the through-hole 310 coincides with the rotation axis AX. The through-hole 310 will be described in more detail later with reference to FIGS.

[0085] The stator core 31 includes a plurality of teeth 31B. The plurality of teeth 31B protrude radially outward from the outer peripheral surface of the yoke 31A. The plurality of teeth 31B are arranged at intervals along the circumferential direction. The plurality of teeth 31B are formed integrally with the yoke 31A. In this embodiment, the plurality of teeth 31B includes nine teeth 31B. A slot is formed between every two adjacent teeth 31B. In other words, the motor 6 of this embodiment is a 12-pole, 9-slot brushless motor.

[0086] 3, 5, and 6, the stator 30 includes an insulator 32. The insulator 32 is made of, for example, a synthetic resin. The insulator 32 covers at least a portion of the surface of the stator core 31.

[0087] As shown in Figures 3, 5, and 6, the stator 30 includes a plurality of coils 33. Each of the plurality of coils 33 includes a wire. Specifically, the insulator 32 covers the coil mounting surface of each of the plurality of teeth 31B and the outer peripheral surface of the yoke 31A. The coil mounting surface is wound with the wire of a corresponding one of the plurality of coils 33. The outer peripheral surface of the yoke 31A is in contact with the wire of each of the plurality of coils 33. Therefore, the stator core 31 is insulated from the coils 33 by the insulator 32.

[0088] In this embodiment, the stator core 31 and the insulator 32 are integrally molded. The insulator 32 may be fixed to the stator core 31 by insert molding. Specifically, the stator core 31 and the insulator 32 may be formed as follows. First, the stator core 31 is placed in a mold. Next, heated and melted synthetic resin is injected into the mold. When the synthetic resin solidifies, the insulator 32 is integrated (i.e., fixed) to the stator core 31.

[0089] The multiple coils 33 are provided on the multiple teeth 31B, respectively. That is, in this embodiment, the multiple coils 33 include nine coils 33. The wire of the corresponding coil 33 is wound around each of the multiple teeth 31B. Therefore, multiple coils 33 are provided corresponding to the number of teeth 31B (nine in this embodiment). Note that, for each of the multiple teeth 31B, the coil mounting surface is covered with the insulator 32, but the outer circumferential tooth surface is not covered with the insulator 32. The outer circumferential tooth surface is the surface facing radially outward.

[0090] [2-2-3. Bearings] The motor 6 includes a plurality of bearings, which (i) have the rotor shaft 50 passing through them, and (ii) rotatably support the rotor shaft 50 (and thus the rotor 20).

[0091] In this embodiment, the plurality of bearings include a first bearing 54 (see FIGS. 5 and 6) and a second bearing 56 (see FIGS. 3, 5, and 6). The first bearing 54 is fitted into a third support portion 41C (see FIGS. 3, 5, and 6) of the stator base 40, which will be described later. The second bearing 56 is fitted into a first support portion 41A (see FIGS. 3 to 6) of the stator base 40, which will be described later.

[0092] In this embodiment, the first bearing 54 is a roller bearing (specifically, a radial roller bearing). , more specifically a needle roller bearing), and the second bearing 56 is in the form of a ball bearing (more specifically a radial ball bearing).

[0093] 6, the rotor shaft 50 has a first surface 50A. The first surface 50A corresponds to the area of ​​the surface of the rotor shaft 50 with which the first bearing 54 contacts. The rotor shaft 50 further has a second surface 50B. The second surface 50B corresponds to the area of ​​the surface of the rotor shaft 50 with which the second bearing 56 contacts.

[0094] In this embodiment, the axial length of the first surface 50A is longer than the axial length of the second surface 50B. However, the axial length of the first surface 50A may be shorter than or equal to the axial length of the second surface 50B.

[0095] [2-2-4. Stator base] The stator base 40 of this embodiment is made of aluminum. That is, the stator base 40 includes an aluminum alloy. In this embodiment, the stator base 40 is integrally formed of an aluminum alloy.

[0096] 3 to 6, the stator base 40 includes a support portion 41. The support portion 41 (i) has a cylindrical shape and (i) has a plurality of steps along the rotation axis AX. The rotor shaft 50 passes through the support portion 41 in the axial direction.

[0097] More specifically, the support portion 41 includes a first support portion 41A, a second support portion 41B, and a third support portion 41C, all of which have a cylindrical shape. The first support portion 41A is connected to the second support portion 41B along the rotation axis AX. The second support portion 41B is connected to the third support portion 41C along the rotation axis AX. The outer diameter of the second support portion 41B is larger than the outer diameter of the third support portion 41C. The outer diameter of the first support portion 41A is larger than the outer diameter of the second support portion 41B.

[0098] The first support portion 41A has an inner diameter large enough to fit the second bearing 56. The second support portion 41B has an outer diameter large enough to fit into the hollow portion of the insulator 32 and larger than the inner diameter of the hollow portion of the stator core 31 (more specifically, the hollow portion of the yoke 31A). The third support portion 41C has an inner diameter large enough to fit the first bearing 54 and an outer diameter large enough to be inserted into the hollow portion of the stator core 31.

[0099] 3 and 5 show a state in which the first and second bearings 54, 56 are inserted onto the rotor shaft 50. However, in reality, as will be described later, the first and second bearings 54, 56 are first fixed inside the stator base 40. Thereafter, the rotor shaft 50 is inserted into the stator base 40 and is thereby supported by the first and second bearings 54, 56.

[0100] 6, the support portion 41 is inserted into the through hole 310 of the stator core 31. More specifically, the third support portion 41C is inserted into the through hole 310. The stator core 31 is fixed to the third support portion 41C in a first fixing manner, and is thereby supported by the support portion 41 (and therefore by the stator base 40).

[0101] The first fixing mode is a mode in which the stator core 31 is fixed without using screws. The first fixing mode is also a mode in which the inner circumferential surface 415 (see FIG. 7) of the third support portion 41C is not deformed when the stator core 31 is fixed to the third support portion 41C. That is, in this embodiment, in the process of inserting the stator core 31 into the third support portion 41C and fixing it to the third support portion 41C, the inner circumferential surface 415 of the third support portion 41C may not be deformed due to the insertion and / or fixing. This rarely occurs.

[0102] In this embodiment, the first fixing manner includes adhesive fixing using an adhesive 45. That is, in this embodiment, the stator core 31 is adhesively fixed to the third support portion 41C (and therefore to the stator base 40) using the adhesive 45.

[0103] The first and second bearings 54, 56 may each be fixed to the stator base 40 in any manner. In the present embodiment, the first bearing 54 is fixed to the third support portion 41C in a second fixing manner. The second fixing manner is a manner in which the third support portion 41C is (or may be) deformed due to the first bearing 54 being fixed to the third support portion 41C. That is, in the present embodiment, in the step of fitting the first bearing 54 into the third support portion 41C and fixing it to the third support portion 41C, the third support portion 41C is or may be deformed due to the fitting and / or fixation.

[0104] In this embodiment, the second fixing manner includes press-fitting, that is, the first bearing 54 is press-fitted into the third support portion 41C and thereby fixed to the third support portion 41C. In this embodiment, the second bearing 56 is also press-fitted into the first support portion 41A.

[0105] However, the first bearing 54 may be fixed to the third support portion 41C by a method other than press-fitting. For example, the first bearing 54 may be fixed to the third support portion 41C by shrink fitting, cold fitting, or other methods. The same applies to the second bearing 56.

[0106] The first bearing 54 is disposed so as to at least partially overlap in the axial direction with the stator core 31 and the rotor core 22. The second bearing 56 does not overlap in the axial direction with the stator 31 and the rotor core 22.

[0107] When assembling the motor 6, the first bearing 54 and the second bearing 56 are fixed to the stator base 40. Thereafter, the rotor shaft 50 is inserted through the first bearing 54 and the second bearing 56 in this order, and is thereby supported by the stator base 40 (more specifically, supported by the first and second bearings 54, 56). Therefore, the output shaft 51 of the motor 6 is supported by the first support portion 41A so as to be rotatable around the rotation axis AX.

[0108] As shown in FIGS. 3 to 6, the stator base 40 includes an attachment portion 42. The attachment portion 42 is integrally formed with the support portion 41. The attachment portion 42 includes an attachment portion main body 42A. The attachment portion main body 42A has a hollow disk shape. The attachment portion main body 42A is provided on the outer periphery of the first support portion 41A.

[0109] The mounting portion 42 includes a first mounting portion 42B, a second mounting portion 42C, and a third mounting portion 42D. Any one or two of the first mounting portion 42B, the second mounting portion 42C, and the third mounting portion 42D may be omitted.

[0110] The first mounting portion 42B, the second mounting portion 42C, and the third mounting portion 42D each protrude radially outward from the mounting portion main body 42A. The first mounting portion 42B, the second mounting portion 42C, and the third mounting portion 42D each have a hole SH at their tip end. The tip end corresponds to the end opposite the mounting portion main body 42A. A screw (not shown) is inserted into each hole SH. Each screw is threaded into a threaded hole (not shown) provided on the inner surface of the housing 2, thereby fixing the mounting portion 42 (and therefore the motor 6) to the housing 2. Note that the mounting portion 42 may be indirectly attached to the housing 2. In other words, another object may be interposed between the mounting portion 42 and the housing 2.

[0111] A substrate fixing portion 42E is provided between the first mounting portion 42B and the second mounting portion 42C. The substrate fixing portion 42E fixes the sensor substrate 60. The substrate fixing portion 42E has a shape corresponding to the shape of the sensor substrate 60, specifically, an arc shape centered on the rotation axis AX.

[0112] 3 and 5, the substrate fixing portion 42E has a first hole 43 and a first pin 43A at a first end thereof. The first pin 43A is inserted into the first hole 43. Specifically, in this embodiment, the first pin 43A is press-fitted into the first hole 43.

[0113] The substrate fixing portion 42E has a second hole 44 and a second pin 44A at its second end. The second pin 44A is inserted into the second hole 44. Specifically, in this embodiment, the second pin 44A is press-fitted into the second hole 44.

[0114] The first pin 43A is inserted into a third hole 65 in the sensor substrate 60. The second pin 44A is inserted into a fourth hole 66 in the sensor substrate 60. FIG. 2 shows the first pin 43A inserted into the third hole 65. In this embodiment, the first pin 43A and the second pin 44A are loosely fitted into the third hole 65 and the fourth hole 66, respectively. The first pin 43A and the second pin 44A position the sensor substrate 60 at a specified position relative to the stator base 40 (and therefore relative to the stator 30).

[0115] [2-2-5. Sensor board] The sensor board 60 is equipped with three magnetic sensors 62 that detect the rotational position of the rotor 20. Each of the three magnetic sensors 62 detects a change in the magnetic field that accompanies the rotation of the rotor 20 and outputs a detection signal corresponding to the detected change. The sensor board 60 is supported on the stator base 40 so that each of the three magnetic sensors 62 mounted on the sensor board 60 faces a corresponding one of the multiple magnets 23 in the axial direction. The sensor board 60 is disposed radially outward of the multiple coils 33.

[0116] The sensor substrate 60 includes a connection terminal 64. The connection terminal 64 is electrically connected to the three magnetic sensors 62. The connection terminal 64 is further electrically connected to the controller 11 via wiring (not shown). The connection terminal 64 electrically connects the three magnetic sensors 62 to the controller 11. The sensor substrate 60 includes the third hole 65 and fourth hole 66 described above.

[0117] [2-3. Fixing the stator to the stator base] 7 to 9, a method for fixing the stator 30 to the stator base 40 will be described in more detail. Note that, for the sake of simplicity and ease of understanding, only the stator core 31 of the stator 30 is illustrated in FIGS.

[0118] 7, in the stator base 40, the third support portion 41C has the aforementioned inner circumferential surface 415. When the first bearing 54 is press-fitted into the third support portion 41C, the outer circumferential surface 54A of the first bearing 54 is pressed against the inner circumferential surface 415 of the third support portion 41C. This fixes the first bearing 54 to the third support portion 41C.

[0119] The third support portion 41C has an outer peripheral surface 411. The outer peripheral surface 411 is inserted into the through hole 310 of the stator core 31 and faces the stator inner peripheral surface 310B. The stator inner peripheral surface 310B corresponds to the inner peripheral surface of the through hole 310.

[0120] The outer peripheral surface 411 has an outer peripheral flat area 411A. The outer peripheral flat area 411A corresponds to a part of the outer peripheral surface 411, while the outer peripheral flat area 411A is a flat surface.

[0121] 7 and 8, the through-hole 310 of the stator core 31 has an opening 310A. The third support portion 41C and the rotor shaft 50 protrude leftward from this opening 310A.

[0122] The through hole 310 has a stator inner peripheral surface 310B that faces the outer peripheral surface 411 of the third support portion 41C. The through hole 310 has an inner peripheral flat area 311 on the stator inner peripheral surface 310B. The third support portion 41C is inserted into the through hole 310 so that its outer peripheral flat area 411A faces the inner peripheral flat area 311 of the through hole 310 (see FIG. 9 ). By inserting and fixing the third support portion 41C into the through hole 310 in this manner, circumferential movement of the stator core 31 with respect to the stator base 40 is restricted.

[0123] Through-hole 310 has a plurality of recesses 315 on stator inner circumferential surface 310B. Each of the plurality of recesses 315 extends from opening 310A to a right opening along rotation axis AX on stator inner circumferential surface 310B.

[0124] In this embodiment, the through-hole 310 has five recesses 315. However, the through-hole 310 may have any number of recesses 315. The through-hole 310 may have one or more recesses 315. The through-hole 310 does not necessarily have to have any recesses 315.

[0125] 9, the motor 6 has a minute clearance 316 between the stator inner peripheral surface 310B and the outer peripheral surface 411 of the third support portion 41C. The clearance 316 includes a plurality of recesses 315. The clearance 316 is filled with an adhesive 45, which fixes the stator core 31 to the third support portion 41C.

[0126] [2-4. Electrical configuration] Next, the electrical configuration of the electric operating machine 1 will be outlined. In this embodiment, the nine coils 33 are connected in a delta configuration. Specifically, the nine coils 33 include a first coil group, a second coil group, and a third coil group. The first coil group includes three of the nine coils 33, which are connected in parallel. The second coil group includes three of the nine coils 33 that are different from the first coil group, which are connected in parallel. The third coil group includes three of the nine coils 33 that are different from the first and second coil groups, which are connected in parallel. The first to third coil groups are connected in a delta configuration.

[0127] As shown in FIGS. 2 to 5, the motor 6 includes a lead group L. In this embodiment, the lead group L includes nine lead wires. Each of the nine lead wires is connected to one of the plurality of coils 33.

[0128] As shown in FIGS. 2 to 5, the motor 6 includes a first fusing terminal 35U, a second fusing terminal 35V, a third fusing terminal 35W, a first tube TBu, a second tube TBv, and a third tube TBw.

[0129] Of the nine lead wires, three corresponding to the U phase (hereinafter referred to as the "U-phase wiring group") are connected to the first fusing terminal 35U. Of the nine lead wires, three corresponding to the V phase (hereinafter referred to as the "V-phase wiring group") are connected to the second fusing terminal 35V. Of the nine lead wires, three corresponding to the W phase (hereinafter referred to as the "W-phase wiring group") are connected to the third fusing terminal 35W.

[0130] The U-phase wire group is bundled together and inserted into the first tube TBu corresponding to the U-phase, the V-phase wire group is bundled together and inserted into the second tube TBv corresponding to the V-phase, and the W-phase wire group is bundled together and inserted into the third tube TBw corresponding to the W-phase.

[0131] The first to third fusing terminals 35U, 35V, and 35W are electrically connected to the controller 11. The controller 11 receives battery power from the battery pack 12. The controller 11 converts the battery power into three-phase power based on detection signals from the three magnetic sensors 62 and other information. The controller 11 supplies the three-phase power to the motor 6 via the first to third fusing terminals 35U, 35V, and 35W. This drives the motor 6.

[0132] [2-5. Technical Effects of the Embodiments] According to the embodiment described above, the following technical effects are achieved. The stator core 31 is fixed to the stator base 40 in a first fixing manner. Therefore, the stator core 31 can be appropriately fixed to the stator base 40. That is, deformation of the inner circumferential surface 415 of the stator base 40 caused by fixing the stator core 31 can be suppressed or prevented. This allows the first bearing 54 to be fixed to the stator base 40 with high precision.

[0133] More specifically, the stator core 31 is adhesively fixed to the stator base 40 by the adhesive 45. Therefore, the stator core 31 can be fixed to the stator base 40 easily and stably.

[0134] On the other hand, the first and second bearings 54, 56 are fixed to the stator base 40 in a second fixing manner. Specifically, the first and second bearings 54, 56 are fixed to the stator base 40 by press-fitting. Therefore, the first and second bearings 54, 56 can be fixed easily and firmly.

[0135] Stator inner peripheral surface 310B is formed with a plurality of recesses 315. This ensures a necessary and sufficient clearance 316 for filling with adhesive 45. This allows stator core 31 to be fixed to stator base 40 more stably.

[0136] The stator base 40 is made of an aluminum alloy. This contributes to reducing the weight of the motor 6. As described above, if the stator core 31 were to be fixed to the stator base 40 by press-fitting, it would be difficult to construct the stator base 40 from an aluminum alloy or other non-ferrous metal. However, in this embodiment, the stator core 31 is adhesively fixed to the stator base 40. Therefore, even if the stator base 40 is made of an aluminum alloy, the stator base 40 is not or hardly damaged by the stator core 31. Therefore, the feature of this embodiment in which the stator core 31 is adhesively fixed to the stator base 40 indirectly contributes to reducing the weight of the motor 6.

[0137] [2-6. Terminology] The saw chain 10 corresponds to an example of a driven tool in the summary of the embodiments. The stator base 40 (particularly the third support portion 41C) corresponds to an example of a stator support portion in the summary of the embodiments. The first bearing 54 corresponds to an example of a first bearing in the summary of the embodiments. The second bearing 56 corresponds to an example of a second bearing in the summary of the embodiments. The rotor shaft 50 corresponds to an example of a shaft in the summary of the embodiments. Each of the multiple recesses 315 corresponds to an example of a first recess in the summary of the embodiments. The housing 2 corresponds to an example of a casing in the summary of the embodiments.

[0138] [2-7. Other embodiments] The present disclosure is not limited to the above-described embodiment, and can be implemented in various modifications. In the above embodiment, the stator inner peripheral surface 310B is formed with a plurality of recesses 315. Instead of or in addition to the plurality of recesses 315, one or more recesses may be formed in the outer peripheral surface 411 of the stator base 40.

[0139] 10A, the stator core 31 may not have a recess 315, and one or more recesses 317 may be formed in the outer peripheral surface 411 of the stator base 40 (specifically, the third support portion 41C). The clearance 316 including the one or more recesses 317 may be filled with adhesive 45. Each of the one or more recesses 317 corresponds to an example of the second recess in the summary of the embodiment.

[0140] 10B, one or more recesses 315 may be formed in the stator core 31, and one or more recesses 317 may also be formed in the outer peripheral surface 411 of the third support portion 41C. Then, adhesive 45 may be filled into a clearance 316 including one or more recesses 315 and one or more recesses 317.

[0141] In the above embodiment, the stator core 31 is adhesively fixed to the stator base 40. However, the stator core 31 may be fixed to the stator base 40 in a first fixing manner other than adhesive fixing. For example, the stator core 31 may be fixed to the stator base 40 using a member other than a screw.

[0142] In the above embodiment, the first bearing 54 is in the form of a needle roller bearing. However, the first bearing 54 may be in a form other than a needle roller bearing. The second bearing 56 may also be in a form other than a ball bearing.

[0143] The motor 6 in the above embodiment is a brushless motor with 12 poles and 9 slots. However, the motor 6 may have any number of poles (i.e., magnets 23) and any number of teeth (i.e., slots). Furthermore, the multiple coils 33 may be connected to each other using any wiring method. Furthermore, the motor 6 may be a motor of a type other than a brushless motor.

[0144] The electric working machine 1 in the above embodiment has the form of an electric chainsaw. However, the electric working machine 1 may have a form other than an electric chainsaw. Specifically, the electric working machine 1 may have the form of any of the various types of equipment described above that are configured to be used at work sites such as for DIY, manufacturing, gardening, and construction.

[0145] Instead of or in addition to the battery pack 12, the electric working machine 1 may be configured to be able to be driven by receiving AC power from an AC power source. [2-8. Supplementary Information] In the above embodiments, multiple functions achieved by one component may be achieved by multiple components, and one function achieved by one component may be achieved by multiple components. Furthermore, multiple functions achieved by multiple components may be achieved by one component, and one function achieved by multiple components may be achieved by one component. Furthermore, part of the configuration of the above embodiments may be omitted. Furthermore, at least part of the configuration of one of the above embodiments may be added to or substituted for the configuration of another of the above embodiments. [Explanation of symbols]

[0146] 1...electric work machine, 2...housing, 6...motor, 10...saw chain, 13...power transmission part, 20...rotor, 22...rotor core, 23...magnet, 30...stator, 31...stator core, 33...coil, 40...stator base, 41A...first support part, 41B...second support part, 41C...third support part, 42...mounting part, 45...adhesive, 50...rotor shaft, 50A...first surface, 50B...second surface, 54...first bearing, 56...second bearing, 310...through hole, 310A...opening, 310B...stator inner surface, 315, 317...recess, 316...clearance.

Claims

1. an outer rotor type motor; a power transmission unit configured to have a driven tool attached thereto or to have the driven tool removably attached thereto, and configured to transmit rotation of the motor to the driven tool to drive the driven tool; Equipped with The motor (i) a rotor including a rotor core and a shaft, and (ii) configured to rotate to drive the driven tool via the power transmission part, the rotor core having a cylindrical shape and including a magnet; a stator disposed on an inner circumferential side of the rotor core, the stator including a coil and a through hole through which the shaft passes; a stator support portion (i) having a cylindrical shape, (ii) inserted into the through hole, and (iii) having the stator fixed thereto in a first fixing manner, thereby supporting the stator, wherein the first fixing manner does not use a screw and does not cause deformation of an inner circumferential surface of the stator support portion due to the stator being fixed to the stator support portion; (i) a first bearing fixed to the stator support within the stator support, and (ii) rotatably supporting the shaft; An electric work machine equipped with:

2. The electric operating machine according to claim 1, the first bearing is fixed to the stator support portion in a second fixing manner, the second fixing mode is a mode in which deformation of the stator support portion occurs due to fixing of the first bearing to the stator support portion; Electric work equipment.

3. The electric operating machine according to claim 2, The electric operating machine, wherein the second fixing manner includes press-fitting.

4. The electric operating machine according to any one of claims 1 to 3, The electric operating machine, wherein the first fixing manner includes adhesive fixing using an adhesive.

5. The electric operating machine according to claim 4, The electric working machine further comprises: (i) a first recess on the inner peripheral surface of the stator, which is the inner peripheral surface of the through hole, and (ii) filled with a first portion of the adhesive; and / or (i) a second recess on an outer peripheral surface of the stator support portion facing the inner peripheral surface of the stator, and (ii) filled with a second portion of the adhesive; An electric work machine equipped with:

6. The electric operating machine according to claim 5, The electric working machine includes the first recess.

7. The electric operating machine according to claim 6, the through-hole has an opening through which the shaft protrudes; The first recessed portion extends from the opening on the inner peripheral surface of the stator along the rotation axis of the shaft. Electric work equipment.

8. An electric operating machine according to any one of claims 1 to 7, an inner peripheral surface of the stator, which is an inner peripheral surface of the through hole, has a first flat area; an outer peripheral surface of the stator support portion facing the inner peripheral surface of the stator has a second flat surface area facing the first flat surface area; Electric work equipment.

9. An electric operating machine according to any one of claims 1 to 8, moreover, (i) a second bearing separate from the first bearing, (ii) fixed to the stator support within the stator support, and (iii) rotatably supporting the shaft; An electric work machine equipped with:

10. The electric operating machine according to claim 9, an electric working machine, wherein the first bearing at least partially overlaps with the stator in an axial direction along the rotation axis of the shaft, and the second bearing does not overlap with the stator.

11. The electric operating machine according to claim 10, The shaft a first surface configured to be contacted by the first bearing; a second surface configured to be contacted by the second bearing; and Equipped with The axial length of the first surface is greater than the axial length of the second surface. Electric work equipment.

12. An electric operating machine according to any one of claims 1 to 11, The electric power tool, wherein the first bearing is in the form of a needle roller bearing.

13. An electric operating machine according to any one of claims 1 to 12, moreover, a housing that houses the motor; a mounting portion that directly or indirectly fixes the stator support portion to the housing; An electric work machine equipped with:

14. The electric operating machine according to claim 13, The mounting portion is integrally formed with the stator support portion.

15. An electric operating machine according to any one of claims 1 to 14, the stator support portion includes an aluminum alloy, At least a portion of the stator including the through hole contains electromagnetic steel. Electric work equipment.

16. an outer rotor type motor; a power transmission unit configured to have a driven tool attached thereto or to have the driven tool removably attached thereto, and configured to transmit rotation of the motor to the driven tool to drive the driven tool; Equipped with The motor (i) a rotor including a rotor core and a shaft, and (ii) configured to rotate to drive a driven tool via the power transmission part, the rotor core having a cylindrical shape and including a magnet; a stator disposed on an inner circumferential side of the rotor core, the stator including a coil and a through hole through which the shaft passes; a stator support portion (i) having a cylindrical shape, (ii) inserted into the through hole, and (iii) having the stator adhered and fixed thereto by an adhesive, thereby supporting the stator; An electric work machine equipped with:

17. A manufacturing method of an outer rotor type motor mounted on an electric work machine, Fixing the stator to a stator support portion in a predetermined fixing manner, the fixing method including inserting the stator support portion into a through hole of the stator, the stator support portion having a cylindrical shape, the stator support portion and the through hole configured to allow a shaft of a rotor to pass through, the predetermined manner not using screws, and not causing deformation of an inner peripheral surface of the stator support portion due to fixing the stator to the stator support portion; inserting a bearing into the stator support and fixing the bearing to the stator support, the bearing being configured to rotatably support the shaft; A method for providing the above.

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