ELECTRIC WORK MACHINE

Abstract

One aspect of the present disclosure provides for an electric machine (1, 101, 201, 301) with a brushless DC motor (25). A stator (30) of the brushless DC motor has a conductive component (55, 155, 255, 355) which is stacked on a yoke (40a) of the stator via an insulator (51, 52) of the stator in an axial direction of a rotational axis (AX) of the brushless DC motor. A first connector (55W3, 155W3, 255U4, 355W4, 355V3) in the conductive component is aligned with a second connector (55W4, 155W4, 255U5, 355V5, 355W5) in the conductive component transversely to the axial direction. The first connector and the second connector overlap an axially extended region of coils (34, 134, 234) on the stator when viewed from a direction perpendicular to the axial direction. The first connector and the second connector are connected to a first end (35a, 135a, 235a) and a second end (35a, 135a, 235a), respectively.a second end (35b, 135b, 235b) of at least one magnet wire (35, 135, 235, 236) of the coils coupled.

Description

[0001] The present disclosure relates to an electric machine with a brushless DC motor.

[0002] Japanese patent no. 7242214 discloses an electric work machine with a brushless DC motor.

[0003] The brushless DC motor has a rotor and a stator. The rotor has magnets. The stator surrounds the rotor. The stator has coils. The coils are made of magnet wire. The magnet wire has a starting end and a ending end. The starting end and the ending end are connected to the same conductive component, being offset from each other in an axial direction of the rotor.

[0004] In the electric motor described above, because the starting and ending ends of the magnet wire are offset from each other in the axial direction, the axial dimension of the brushless DC motor can increase. As a result, the electric motor can be larger.

[0005] On the other hand, users of electric work machines are demanding smaller electric work machines.

[0006] In one aspect of the present disclosure, it is desirable to be able to inhibit (prevent) the increase in size of an electric machine with a brushless DC motor.

[0007] In the present revelation, it should be noted that terms such as "first" and "second" are simply intended to distinguish elements from one another and are not meant to restrict the order or number of elements. The first element may be called the second element, and similarly, the second element may be called the first element. Furthermore, the first element may be included without the second element, and similarly, the second element may be included without the first element.

[0008] One aspect of the present disclosure provides for an electric working machine with a brushless DC motor.

[0009] The brushless DC motor has a rotor and a stator. The rotor is designed to rotate around an axis of rotation. The stator surrounds the rotor.

[0010] The stator consists of a stator core, an insulator, coils, and a conductive component.

[0011] The stator core has a yoke and teeth. The yoke surrounds the rotor. The teeth project radially inwards from the yoke.

[0012] The insulator covers at least a section of the stator core. The coils consist of at least one magnet wire wound around the teeth over the insulator.

[0013] The conductive component has a first connector and a second connector. The first connector is coupled to the first end of one of the at least one magnet wire. The second connector is coupled to the second end of one of the at least one magnet wire.

[0014] The conductive component is stacked on the yoke above the insulator in an axial direction of the axis of rotation.

[0015] The first connector is offset from the second connector in a circumferential direction around the axis of rotation, but oriented perpendicular to the axial direction relative to the second connector. The first and second connectors overlap an axially extended (extending axially) region of the coils when viewed from a direction perpendicular to the axial direction.

[0016] In the brushless DC motor of the electric machine as described above, the axial size of the brushless DC motor can be reduced because (i) the position of the first connector coincides with the position of the second connector in the axial direction, and (ii) the first and second connectors overlap the axially extended area (axial extension area) of the coils when viewed from the direction perpendicular to the axial direction. Accordingly, the increase in the size of the electric machine can be prevented.

[0017] Examples of embodiments of the present disclosure are described below with reference to the accompanying drawings, in which: Fig. 1 an external view of an electric machine according to an exemplary first embodiment; Fig. 2 a first perspective view of a motor unit in the electric machine of the first embodiment; Fig. 3 shows a perspective exploded view of the motor unit, which corresponds to the first perspective view of the motor unit in the first embodiment; Fig. 4 shows a perspective exploded view of a stator, a rotor, a blower and a circuit board, corresponding to the first perspective view of the motor unit in the first embodiment; Fig. 5 is a perspective view showing an internal structure of a left partial housing of the first embodiment; Fig. 6 a second perspective view of the motor unit in the electric machine of the first embodiment; Fig. 7 shows a perspective exploded view of the motor unit, which corresponds to the second perspective view of the motor unit in the first embodiment; Fig. Figure 8 shows a perspective exploded view of the stator, rotor, blower and circuit board, which corresponds to the second perspective view of the motor unit in the first embodiment; Fig. 9 shows a perspective exploded view of a first insulator, a stator core, a second insulator and a conductive component, which corresponds to the first perspective view of the motor unit in the first embodiment; Fig. 10 is a perspective view of the stator of the first embodiment, showing coils and conductive components; Fig. 11 is an enlarged view of a W-phase conductor component of the first embodiment, showing its section with fusion terminals; Fig. 12 an explanatory view of the coils and the conductive components of the stator of the first embodiment viewed from the rear; Fig. 13 is an explanatory diagram that schematically shows an electrical connection structure of the coils and the conductive components in the stator of the first embodiment; Fig. 14 an explanatory view of coils and conductive components of a stator of a second embodiment viewed from the rear; Fig. 15 is an enlarged view of a second W-phase conductor component of the second embodiment, showing its section with fusion terminals; Fig. 16 is an explanatory diagram that schematically shows an electrical connection structure of coils and conductive components in the stator of the second embodiment; Fig. 17 is an explanatory diagram that schematically shows coils and conductive components in a stator of a third embodiment viewed from the rear; Fig. 18A to 18C are explanatory diagrams of the third conductive components of the third embodiment. Fig. Figure 18A shows an embodiment of a third U-phase conductor component, Fig. Figure 18B shows an embodiment of a third V-phase conductor component, and Fig. 18C shows an embodiment of a third W-phase conductor component; Fig. 19 is an exploded view which schematically shows how the third conductive components and insulating components of the third embodiment are stacked on top of each other; Fig. 20 is an explanatory diagram that schematically shows an electrical connection structure of the coils and the conductive components in the stator of the third embodiment; Fig. 21 is an explanatory diagram that schematically shows coils and conductive components in a stator of a fourth embodiment viewed from the rear; Fig. 22A to 22C are explanatory diagrams of the fourth conductive components of the fourth embodiment. Fig. 22A shows an embodiment of a fourth U-phase conductor component, Fig. Figure 22B shows an embodiment of a fourth V-phase conductor component, and Fig. 22C shows an embodiment of a fourth W-phase conductor component; Fig. 23 is an exploded view which schematically shows how the fourth conductive components and the insulating components of the fourth embodiment are stacked on top of each other; and Fig. 24 is an explanatory diagram that schematically shows an electrical connection structure of the coils and the conductive components in the stator of the fourth embodiment. [1. Overview of embodiments]

[0018] One embodiment may provide an electric work machine (or an electric power tool or electrically powered equipment or on-site device) with at least one of the following: - Feature 1: a brushless DC motor; - Feature 2: the brushless DC motor has a rotor designed to rotate around an axis of rotation; - Feature 3: the brushless DC motor has a stator that surrounds the rotor; - Feature 4: the stator has a stator core; - Feature 5: the stator core has a yoke that surrounds the rotor; - Feature 6: the stator core has teeth that project radially inwards from the yoke; - Feature 7: the stator has an insulator that covers at least a section of the stator core; - Feature 8: the stator has coils formed from at least one magnet wire wound around the teeth over the insulator; - Feature 9: the stator has a conductive component; - Feature 10: the conductive component has a first connector which is coupled to (or connected to) a first end of one of the at least one magnet wire; - Feature 11: the conductive component has a second connector which is coupled (or connected) to a second end of one of the at least one magnet wire; - Feature 12: the conductive component is stacked on the yoke above the insulator in an axial direction of the axis of rotation; - Feature 13: the first connector is offset from the second connector in a circumferential direction of the axis of rotation, but is aligned with the second connector transversely to the axial direction (or in a radial direction of the axis of rotation); - Feature 14: the first connector and the second connector overlap an axially extended area of ​​the coils viewed from a direction perpendicular to the axial direction.

[0019] In the electric machine with at least features 1 to 14, the brushless DC motor can inhibit (prevent) an increase in size in the axial direction because the first and second connectors (i) are not offset from each other and (ii) overlap the axially extended area of ​​the coils when viewed from the direction perpendicular to the axial direction. Consequently, the electric machine's size increase can be prevented.

[0020] An embodiment may, in addition to or instead of at least one of the features 1 to 14, have at least one of the following: - Feature 15: the first connector and the second connector are each formed from a plate component; - Feature 16: the panel component is bent in such a way that its cross-section has a U-shape; - Feature 17: the first connector and the second connector are each arranged such that a first extension direction, which connects an open end and a closed end of the U-shape, is arranged parallel to the axial direction; - Feature 18: the first connector is coupled (or connected) to the first end, which is located inside the U-shape; and - Feature 19: the second connector is coupled (or connected) to the second end, which is located inside the U-shape.

[0021] An embodiment may additionally include, or instead of, at least one of the features 1 to 19: - Feature 20: the first connector and the second connector are arranged such that a gap between the first connector and the second connector in the circumferential direction is greater than or equal to the width of one of the teeth in the circumferential direction.

[0022] In the electric machine with at least features 1 to 14 and 20, it is possible to ensure that the gap between the first connector and the second connector is greater than or equal to a certain level. This makes it easy to ensure a working space for connecting the first connector to the first end and a working space for connecting the second connector to the second end. Consequently, it is possible to reduce the complexity of connecting the first end and the second end to the first connector and the second connector, respectively.

[0023] An embodiment may additionally include, or instead of, at least one of the features 1 to 20: - Feature 21: the first connector and the second connector are arranged such that a gap between the first connector and the second connector in the circumferential direction is smaller than the width of one of the teeth in the circumferential direction.

[0024] In the electric machine with at least features 1 to 14 and 21, the first connector and the second connector can be located close to each other, and the at least one magnet wire can be routed such that the first end and the second end are in close proximity. This allows the same routing path for the at least one magnet wire as if the first end and the second end were connected to a single connector, thus reducing the need to change the routing path of the at least one magnet wire when another conductive component with a single connector is replaced by the conductive component with the first connector and the second connector.

[0025] An embodiment may additionally include, or instead of, at least one of the features 1 to 21: - Feature 22: at least one magnet wire is a single magnet wire.

[0026] In the electric machine with at least features 1 to 14 and 22, it is possible to prevent the first and second ends of the single magnet wire from being offset from each other in the axial direction.

[0027] An embodiment may additionally include, or instead of, at least one of the features 1 to 22: - Feature 23: at least one magnet wire is two or more, but a smaller number of magnet wires than the coils.

[0028] In the electric working machine with at least features 1 to 14 and 23, it is possible to prevent the first and second ends of each of the two or more, but a smaller number of, magnet wires than the coils from being offset from each other in the axial direction.

[0029] An embodiment may, in addition to or instead of at least one of the features 1 to 23, have at least one of the following: - Feature 24: a rotary position sensor designed to detect a rotary position of the rotor; and - Feature 25: the rotary position sensor is arranged on the stator core in the axial direction opposite to the conductive component.

[0030] In the electric machine with at least features 1 to 14, 24 and 25, it is possible to prevent the conductive component and the rotary position sensor from interfering with each other, while reducing the size of the brushless DC motor in the axial direction.

[0031] An embodiment may additionally include, or instead of, at least one of the features 1 to 25: - Feature 26: the first connector and the second connector overlap the stator core when viewed from the axial direction.

[0032] In the electric machine with at least features 1 to 14 and 26, it is possible to reduce the size of the brushless DC motor in the radial direction because the first and second connectors are not positioned further outside the stator core in the radial direction. This makes it possible to further limit the size of the electric machine.

[0033] An embodiment may additionally include, or instead of, at least one of the features 1 to 26: - Feature 27: the conductive component electrically couples different two of the coils to each other.

[0034] In the electric working machine with at least features 1 to 14 and 27, it is possible to do without a connecting wire (or a bridging wire or a jumper wire) for electrically coupling two different coils to each other.

[0035] An embodiment may additionally include, or instead of, at least one of the features 1 to 27: - Feature 28: the coils comprise a multiple of three coils.

[0036] In the electric machine with at least features 1 to 14 and 28, the brushless DC motor can be a brushless three-phase DC motor.

[0037] An embodiment may, in addition to or instead of at least one of the features 1 to 28, have at least one of the following: - Feature 29: the rotor has eight magnetic poles; and - Feature 30: the stator has six slots.

[0038] In the electric machine with at least features 1 to 14 and 28 to 30, the brushless DC motor can be a brushless eight-pole six-slot three-phase motor.

[0039] An embodiment may have, in addition to or instead of at least one of the features 1 to 30: - Feature 31: the conductive component is in direct or indirect contact with the insulator.

[0040] An embodiment may additionally include, or instead of, at least one of the features 1 to 31: - Feature 32: the conductive component has a power input designed to absorb electrical power for the coils.

[0041] An embodiment may additionally include, or instead of, at least one of the features 1 to 32: - Feature 33: a housing that accommodates the brushless DC motor.

[0042] One embodiment may provide a method comprising at least one of the following: - Feature 34: Stacking a conductive component on a stator core over an insulator in an axial direction of a rotational axis of a brushless DC motor of an electric working machine; - Feature 35: the conductive component has a first connector and a second connector; - Feature 36: the first connector and the second connector are offset from each other in a circumferential direction of the axis of rotation; - Feature 37: the first connector and the second connector are aligned perpendicular to each other in the axial direction; - Feature 38: Coupling (or connecting) a first end of a magnet wire to the first connector; - Feature 39: Winding the magnet wire around teeth of the stator core over an insulator, such that coils are formed such that the first connector and the second connector overlap an axially extended region of the coils when viewed from a direction perpendicular to the axial direction; and - Feature 40: Coupling (or connecting) a second end of the magnet wire to the second connector.

[0043] According to the method with at least features 34 to 40, it is possible to reduce the size of the brushless DC motor in the axial direction. As a result, the increase in size of the electric machine can be prevented.

[0044] Examples of electric work machinery include, but are not limited to, various types of equipment designed for use in construction (building), manufacturing / production, gardening, civil engineering, and other workplaces, including but not limited to power tools for stoneworking, metalworking, and woodworking; power tools for gardening; power tools for a workplace environment; blower vests; blower jackets; electric wheelbarrows (or electric carts / wagons); electrically assisted bicycles (e-bikes); and electric inflators / compressors.

[0045] Examples of power tools include an electric chainsaw, an electric handheld saw, an electric blower, an electric hammer, an electric hammer drill, an electric drill, an electric screwdriver, an electric ratchet wrench, an electric impact wrench, an electric impact ratchet wrench, an electric grinder, an electric circular saw, an electric reciprocating saw, an electric saber saw, an electric jigsaw, an electric cutting device, an electric planer, an electric nailer (including a stapler), an electric hedge trimmer, an electric lawn mower, an electric grass cutter / trimmer, an electric brush cutter, an electric cleaning device, an electric sprayer, an electric spreader, an electric duster (or an electric dust extractor), an electric vacuum cleaner,an electric trowel, an electric stirrer, an electric vibrator, an electric rammer, an electric compactor, an electric pump, an electric pile driver, an electric concrete saw, an electric screed milling machine and an electric chop saw, but are not limited to these.

[0046] The electric machine can be battery-powered or supplied with power by a battery. Specifically, the electric machine can have a built-in battery. Alternatively, the electric machine can be designed so that a battery pack can be attached to it in a detachable manner. The battery pack contains a battery.

[0047] In one embodiment, features 1 to 40 can be combined in any combination.

[0048] In one embodiment, any of features 1 to 40 may be omitted. [2. Specific example implementation forms]

[0049] Some specific example implementations are described below. [2-1. First embodiment]

[0050] The present first embodiment provides for an electric power tool 1 in the configuration of an electric impact wrench. The electric power tool 1 is merely an example, and the present disclosure can be applied to various types of electric power tools.

[0051] For the sake of clarity, the following descriptions and drawings use the terms "top", "bottom", "front", "back", "left", and "right" to define directions as shown in Fig. 1, Fig. Figure 2, etc., is shown. However, these directions are only used to facilitate a basic understanding of the structure of the electric machine 1 and are not intended to restrict any orientation of the electric machine 1. The electric machine 1 can be oriented in any direction. [2-1-1. Overall design of the electric work machine]

[0052] As in Fig. As shown in Figure 1, the electric work machine 1 has a head 10, a motor unit 20, a handle 5, a battery mounting section 6, a chuck 7, and a trigger 8. The motor unit 20 is fixed to a rear end of the head 10. The motor unit 20 includes a motor 25 and a housing 90, which will be described later. The chuck 7 is located at a front end of the head 10.

[0053] The handle 5 is located below the head 10 and the motor unit 20 and extends downwards. The handle 5 is designed to be gripped by a user of the electric work machine 1. The battery mounting section 6 is located at one lower end of the handle 5. The battery mounting section 6 is designed such that the battery pack 3 can be detachably attached to it. The battery pack 3 has battery cells connected in series and is rechargeable. Each battery cell is a lithium-ion battery, but this is not limited to lithium-ion batteries.

[0054] The push button 8 is located on an upper front surface of the handle 5. The push button 8 is designed to be operated manually by the user. In particular, the electric machine is designed such that the motor 25 rotates in response to the user pulling the push button 8, and the motor 25 stops in response to the user releasing the push button 8.

[0055] The head 10 accommodates a power transmission device 12. The power transmission device 12 is arranged in front of the motor unit 20 and mechanically coupled to the motor 25.

[0056] The chuck sleeve 7 is designed such that a driven tool 15 can be detachably attached to it. In the first embodiment, the driven tool 15, for example, takes the form of various types of tool bits. Examples of the different types of tool bits include, but are not limited to, a screwdriver bit, a socket bit, and a drill bit (a drill bit).

[0057] The power transmission device 12 is mechanically coupled to the chuck sleeve 7 for transmitting the rotation of the motor 25 to the chuck sleeve 7. Thus, when the motor 25 rotates, the chuck sleeve 7 rotates together with the driven tool 15 attached to it. The power transmission device 12 also includes a striking mechanism (not shown). The striking mechanism periodically exerts a striking force on the chuck sleeve 7 in one direction of rotation of the chuck sleeve 7 when a load exerted by the chuck sleeve 7 exceeds a certain level. The load is exerted in a direction opposite to the direction of rotation of the chuck sleeve 7.

[0058] The handle 5 has a control unit 100 within its lower end. The control unit 100 receives electrical power from the battery pack 3 for operation and controls the electric work machine 1. For example, the control unit 100 controls drive currents that are supplied to the motor 25 from the battery pack 3, thus controlling the drive of the motor 25. [2-1-2. Design of the motor unit]

[0059] Referring to Fig. The motor unit 20 is described in sections 2 to 13.

[0060] As in Fig. As shown in Figure 3, the motor unit 20 comprises the motor 25, a blower 80, a circuit board 62, and the housing 90. As shown in Fig. As shown in Figure 4, the motor 25 has a rotor 70 and a stator 30. As in Fig. 3, Fig. 4, Fig. 7 and Fig. As shown in Figure 8, the motor 25 has a front bearing 25a and a rear bearing 25b. The front bearing 25a and the rear bearing 25b support the rotor 70 so that it can rotate freely.

[0061] The motor 25 of the present first embodiment is configured as a brushless, internal rotor, three-phase DC motor with a multiple of four magnetic poles (including four magnetic poles) and a multiple of three slots (including three slots). As an example combination of such a number of poles (i.e., number of magnetic poles) and number of slots, a combination of eight poles with six slots is specified in the present first embodiment. The motor 25 of the present first embodiment has a U-phase, a V-phase, and a W-phase as its three phases.

[0062] Directions parallel to the axis of rotation AX of the motor 25 are referred to as the "axial direction." The axial direction coincides with front-back directions. In the radial direction of the axis of rotation AX, a position close to or approaching the axis of rotation AX is referred to as "radially inward," and a position far from or away from the axis of rotation AX is referred to as "radially outward." In the circumferential direction of the axis of rotation AX, a clockwise direction and a counterclockwise direction viewed from the front toward the back are referred to as the "first direction of rotation" and the "second direction of rotation," respectively. [2-1-3. Housing]

[0063] As in Fig. 2 and Fig. As shown in Figure 3, the housing 90 is designed to accommodate the motor 25. The housing 90 is an electrically insulating component and is made of resin (for example, synthetic resin).

[0064] As in Fig. 2 and Fig. As shown in Figure 6, the housing 90 has a cylindrical section 90a and a projecting section 90b. The cylindrical section 90a has a cylindrical shape with one front side open and one rear side closed. The projecting section 90b extends downwards from a lower side of the cylindrical section 90a. The projecting section 90b accommodates power supply ports 61, which are described later.

[0065] As in Fig. As shown in Figures 2, 3, and 5 to 7, the housing 90 is designed to be separable into a right sub-housing 91 and a left sub-housing 92. The right sub-housing 91 forms a right-hand part of the housing 90. The left sub-housing 92 forms a left-hand part of the housing 90. The right sub-housing 91 is mounted from the right side of the motor 25 with respect to the stator 30. The left sub-housing 92 is mounted from the left side of the motor 25 with respect to the stator 30. The left sub-housing 92 is arranged so that it is opposite the right sub-housing 91, thus accommodating the motor 25 between the right sub-housing 91 and the left sub-housing 92.

[0066] As in Fig. As shown in Figure 3, the right sub-housing 91 has two first projecting sections 91a and a second projecting section 91b. Each of the first projecting sections 91a projects towards the motor 25 from an inner surface of the right sub-housing 91. The second projecting section 91b projects towards the motor 25 from a position on the inner surface of the right sub-housing 91 that differs from both of the first projecting sections 91a in the circumferential direction of the axis of rotation AX.

[0067] As in Fig. As shown in Figure 5, the left sub-housing 92 has two third projecting sections 92a and a fourth projecting section 92b. Each of the third projecting sections 92a projects towards the motor 25 from an inner surface of the left sub-housing 92. The fourth projecting section 92b projects towards the motor 25 from a position on the inner surface of the left sub-housing 92 that differs from both of the third projecting sections 92a in the circumferential direction of the axis of rotation AX.

[0068] When the right sub-housing 91 and the left sub-housing 92 are arranged so that they are opposite each other, each of the first preceding sections 91a of the right sub-housing 91 is opposite a corresponding third preceding section 92a of the left sub-housing 92 across the motor 25.

[0069] Furthermore, the second preceding section 91b of the right sub-housing 91 is opposite the fourth preceding section 92b of the left sub-housing 92 across the motor 25.

[0070] As in Fig. As shown in Figure 3, the right sub-housing 91 has two fifth projecting sections 91c. Each of the fifth projecting sections 91c projects from the inner surface of the right sub-housing 91 in the direction of the motor 25.

[0071] As in Fig. As shown in Figure 5, the left sub-housing 92 has two sixth projecting sections 92c. Each of the sixth projecting sections 92c projects from the inner surface of the left sub-housing 92 in the direction of the motor 25.

[0072] As in Fig. As shown in Figure 3, the right sub-housing 91 has a front bearing support 91d and a rear bearing support 91e. The front bearing support 91d projects from the inner surface of the right sub-housing 91 towards the front bearing 25a of the motor 25. The front bearing support 91d has a front bearing contact section 91d1. The front bearing contact section 91d1 is configured to bear against the front bearing 25a. The rear bearing support 91e is formed on a rear inner surface of the right sub-housing 91. The rear bearing support 91e has a rear bearing contact section 91e1. The rear bearing contact section 91e1 is configured to bear against the rear bearing 25b.

[0073] As in Fig. As shown in Figure 5, the left sub-housing 92 has a front bearing support 92d and a rear bearing support 92e. The front bearing support 92d projects from the inner surface of the left sub-housing 92 towards the front bearing 25a of the motor 25. The front bearing support 92d has a front bearing contact section 92d1. The front bearing contact section 92d1 is configured to bear against the front bearing 25a. The rear bearing support 92e is formed on a rear inner surface of the left sub-housing 92. The rear bearing support 92e has a rear bearing contact section 92e1. The rear bearing contact section 92e1 is configured to bear against the rear bearing 25b. [2-1-4. Rotor]

[0074] As in Fig. 4 and Fig. As shown in Figure 8, the rotor 70 has a rotor shaft 71, magnetic pole sections 72 and a rotor core 73. The rotor 70 rotates about the axis of rotation AX.

[0075] The rotor core 73 consists of layered steel plates. Each of the steel plates contains primarily iron. The rotor core 73 has an approximately cylindrical shape surrounding the axis of rotation AX. The rotor core 73 has a through-hole in its center, extending from its front surface to its rear surface.

[0076] The rotor shaft 71 is inserted into the through-hole of the rotor core 73 such that it extends in the axial direction and is fixed to the rotor core 73. A front portion of the rotor shaft 71 projects forward from a front end of the rotor core 73 and is rotatably supported by the front bearing 25a. A rear portion of the rotor shaft 71 projects rearward from a rear end of the rotor core 73 and is rotatably supported by the rear bearing 25b.

[0077] The magnetic pole sections 72 are arranged at regular intervals in the rotor core 73 along the circumference of the axis of rotation AX. Each magnetic pole section 72 has a permanent magnet embedded in the rotor core 73. Each magnetic pole section 72 extends from a radially inner side to a radially outer side of the rotor core 73. In other words, the magnetic pole sections 72 are arranged in a spoke-like configuration around the axis of rotation AX. Each magnetic pole section 72 has a north pole region and a south pole region. The magnetic pole sections 72 are arranged such that the same poles of adjacent magnetic pole sections 72 along the circumference are opposite each other. In other words, the north pole of one magnetic pole section 72 is opposite the north pole of another adjacent magnetic pole section 72 along the circumference.Furthermore, a south pole of one magnetic pole section 72 is opposite a south pole of another magnetic pole section 72 that is adjacent in the circumferential direction. In the present first embodiment, the magnetic pole sections 72 comprise eight magnetic pole sections 72.

[0078] As in Fig. 4 and Fig. As shown in Figure 8, the blower 80 is positioned closer to the rear side of the rotor shaft 71 than the rotor core 73 and is fixed to the rear side of the rotor shaft 71. When the rotor shaft 71 rotates, the blower 80 rotates along with the rotor shaft 71. [2-1-5. Stator]

[0079] As in Fig. 4, Fig. 8 and Fig. As shown in Figure 9, the stator 30 has a stator core 40, a first insulator 51, a second insulator 52, coils 34, a conductive component 55, three power supply terminals 61 and three fixing screws 59.

[0080] The stator core 40 has steel plates that are stacked in the axial direction. Each of the steel plates mainly contains iron.

[0081] As in Fig. As shown in Figure 9, the stator core 40 has a yoke 40a and teeth 40b. The yoke 40a has a cylindrical or ring-shaped form. The yoke 40a is arranged such that its center coincides with the axis of rotation AX.

[0082] The teeth 40b project radially inwards (in other words, in the direction of the axis of rotation AX) from an inner circumferential surface of the yoke 40a. The teeth 40b are arranged at equal intervals around the circumference. The teeth 40b are integrally formed with the yoke 40a. In the present first embodiment, the teeth 40b comprise six teeth 40b.

[0083] As in Fig. As shown in Figure 9, the first insulator 51 and the second insulator 52 are formed separately and fixed to the stator core 40. The first insulator 51 and the second insulator 52 are made of synthetic resin, but can alternatively be made of another electrically insulating material. The first insulator 51 has a shape that covers a front side of the stator core 40. The second insulator 52 has a shape that covers a rear side of the stator core 40.

[0084] In other words, the first insulator 51 is fixed to the stator core 40 at the front side of the stator core 40 and covers a front surface of the stator core 40. The second insulator 52 is fixed to the stator core 40 at the rear side of the stator core 40 and covers a rear surface of the stator core 40.

[0085] The first insulator 51, the stator core 40 and the second insulator 52, which are designed as above, can be separated from each other.

[0086] In another embodiment, the first insulator 51 and the second insulator 52 can be integrally designed to cover the stator core 40.

[0087] As in Fig. 4, Fig. 8 and Fig. As shown in Figure 9, the first insulator 51 has a first main section 51a and first teeth 51b. The first main section 51a has a cylindrical or ring-shaped form. The first main section 51a is arranged such that its center coincides with the axis of rotation AX.

[0088] The first teeth 51b project radially inwards (in other words, in the direction of the axis of rotation AX) from an inner circumferential surface of the first main section 51a. In the present first embodiment, the first teeth 51b comprise six first teeth 51b. Each of the first teeth 51b is configured to cover a front surface of a corresponding tooth 40b of the stator core 40.

[0089] As in Fig. 4, Fig. 8 and Fig. As shown in Figure 9, the second insulator 52 has a second main section 52a and second teeth 52b. The second main section 52a has a cylindrical or ring-shaped form. The second main section 52a is arranged such that its center coincides with the axis of rotation AX.

[0090] The second teeth 52b project radially inwards (in other words, in the direction of the axis of rotation AX) from an inner circumferential surface of the second main section 52a. In the present first embodiment, the second teeth 52b comprise six second teeth 52b. Each of the second teeth 52b is configured to cover a rear surface of a corresponding tooth 40b of the stator core 40.

[0091] Each stator tooth is formed from one corresponding tooth 40b, one corresponding tooth 51b, and one corresponding tooth 52b. In other words, the stator 30 of the present first embodiment has six stator teeth.

[0092] The stator 30 has a multiple of three slots (including three slots). For example, the stator 30 of the present first embodiment has six stator teeth. Thus, the stator 30 of the present first embodiment has six slots. Each of the six slots corresponds to a gap between two adjacent stator teeth. [2-1-6. Coils]

[0093] As in Fig. 4 and Fig. As shown in Figure 8, in the present first embodiment the coils 34 comprise six coils 34. Each of the six coils 34 is provided on a corresponding stator tooth. That is, each of the six coils 34 covers a section of the stator core 40, a section of the first insulator 51 and a section of the second insulator 52 in a corresponding stator tooth.

[0094] The coils 34 are wound around the teeth 40b of the stator core 40 via the first insulator 51 and the second insulator 52 and connected in series. Specifically, each coil 34 is wound around a corresponding tooth 40b via a corresponding tooth 51b and a corresponding tooth 52b. In other words, each of the six coils 34 is arranged around a corresponding tooth 40b, a corresponding tooth 51b, and a corresponding tooth 52b. The six coils 34 and the stator core 40 are electrically insulated from each other by the first insulator 51 and the second insulator 52.

[0095] The six coils 34 are formed from a single (magnetic) wire 35. The coils 34, which are adjacent to each other in the circumferential direction, are coupled by a connecting line 34a, which is part of the (magnetic) wire 35. The connecting line 34a is positioned between one coil 34 and another coil 34 and is supported by the first insulator 51.

[0096] The three power supply connections 61 are electrically connected to the battery pack 3 via the control unit 100. The battery pack 3 supplies the drive currents to the motor 25 via the control unit 100. The control unit 100 delivers the drive currents from the battery pack 3 to the motor 25 and excites the stator 30.

[0097] As in Fig. As shown in Figures 3, 4 and 7 to 9, in the present first embodiment the power supply terminals 61 comprise a U-phase power supply terminal 61U, a V-phase power supply terminal 61V and a W-phase power supply terminal 61W. The U-phase power supply terminal 61U accepts a U-phase drive current. The V-phase power supply terminal 61V accepts a V-phase drive current. The W-phase power supply terminal 61W accepts a W-phase drive current.

[0098] As in Fig. 4 and Fig. As shown in Figure 8, the six coils 34 comprise three pairs of coils, and each pair of coils is assigned to one of the U-phase, the V-phase, and the W-phase. In other words, a first pair of coils 34 is assigned to the U-phase and comprises a U-phase coil 34U1 and a U-phase coil 34U2. The U-phase coil 34U1 and the U-phase coil 34U2 are arranged so that they are opposite each other in the radial direction. A second pair of coils 34 is assigned to the V-phase and comprises a V-phase coil 34V1 and a V-phase coil 34V2. The V-phase coil 34V1 and the V-phase coil 34V2 are arranged so that they are opposite each other in the radial direction. A third pair of coils 34 is assigned to the W-phase and comprises a W-phase coil 34W1 and a W-phase coil 34W2. The W-phase coil 34W1 and the W-phase coil 34W2 are arranged such that they are opposite each other in the radial direction.

[0099] In detail, in the circumferential direction, the V-phase coil 34V1 is arranged next to the U-phase coil 34U1, and the W-phase coil 34W1 is arranged next to the V-phase coil 34V1. The U-phase coil 34U2 is arranged next to the W-phase coil 34W1, and the V-phase coil 34V2 is arranged next to the U-phase coil 34U2. The W-phase coil 34W2 is arranged next to the V-phase coil 34V2, and the U-phase coil 34U1 is arranged next to the W-phase coil 34W2.

[0100] The control unit 100 controls the drive currents that flow through the U-phase coil 34U1, the U-phase coil 34U2, the V-phase coil 34V1, the V-phase coil 34V2, the W-phase coil 34W1 and the W-phase coil 34W2, via the U-phase power supply terminal 61U, the V-phase power supply terminal 61V and the W-phase power supply terminal 61W.

[0101] As in Fig. As shown in Figure 9, the conductive components 55 are arranged on a rear side of the second insulator 52. The conductive components 55 are stacked over the second insulator 52 in the axial direction of the axis of rotation AX on the yoke 40a. In other words, the conductive components 55 are electrically insulated from the stator core 40 by the second insulator 52. The conductive components 55 comprise conductive material.

[0102] In other words, the conductive components 55 are stacked on the second insulator 52 in direct contact with the second insulator 52. The conductive components 55 are stacked on the second insulator 52 on one side of the second insulator 52 opposite the side of the second insulator 52 facing the stator core 40.

[0103] In another embodiment, the conductive components 55 can be stacked indirectly (e.g. via another component) in contact with the second insulator 52.

[0104] Examples of another component include an insulating component 258 (see Fig. 19), which will be described later, but are not limited to that.

[0105] The conductive components 55 comprise the same number of conductive components as the number of phases of the motor 25. In the present first embodiment, the conductive components 55 comprise a U-phase conductive component 55U, a V-phase conductive component 55V and a W-phase conductive component 55W.

[0106] The U-phase conductor component 55U, the V-phase conductor component 55V, and the W-phase conductor component 55W are arranged above the second insulator 52 on a rear side of the yoke 40a of the stator core 40. The U-phase conductor component 55U, the V-phase conductor component 55V, and the W-phase conductor component 55W are each shaped such that they correspond to a part of the annular section of the yoke 40a.

[0107] The U-phase conductor component 55U has a U-phase fixing hole section 55U1, a U-phase extension 55U2, and a U-phase fusion terminal 55U3. The U-phase fixing hole section 55U1 has a hole through which a fixing screw 59 can be inserted. The U-phase extension 55U2 is shaped to correspond to part of the annular section of the yoke 40a. The U-phase extension 55U2 electrically couples the U-phase fixing hole section 55U1 to the U-phase fusion terminal 55U3. The U-phase fusion terminal 55U3 is fused to the magnet wire 35 (which is located in the U-phase fixing hole section 55U1) by a fusion process. Fig. (Figure 9 is not shown), which forms the coils 34 and the connecting lines 34a. The U-phase fusion terminal 55U3 is electrically coupled to the coils 34 and the connecting lines 34a.

[0108] The fusing process is a method for thermally bonding (or diffusion bonding) a magnet wire to a fusing terminal using electrical resistance. The fusing process, by applying pressure during heating, can remove a section of the magnet wire's insulating coating and simultaneously crimp (press) the magnet wire to the fusing terminal. The fusing terminal can be a crimp terminal. The magnet wire can have an insulating coating.

[0109] The V-phase conductor component 55V has a V-phase fixing hole section 55V1, a V-phase extension 55V2, and a V-phase fusion terminal 55V3. The V-phase fixing hole section 55V1 has a hole through which the fixing screw 59 can be inserted. The V-phase extension 55V2 is shaped to correspond to part of the annular section of the yoke 40a. The V-phase extension 55V2 electrically couples the V-phase fixing hole section 55V1 to the V-phase fusion terminal 55V3. The V-phase fusion terminal 55V3 is fused by the fusion process with the magnet wire 35 (which is in Fig. 9 (not shown), which forms the coils 34 and the connecting lines 34a, is connected. The V-phase fusion terminal 55V3 is electrically coupled to the coils 34 and the connecting lines 34a.

[0110] The W-phase conductor component 55W comprises a W-phase fixing hole section 55W1, a W-phase extension 55W2, a first W-phase fusion terminal 55W3, and a second W-phase fusion terminal 55W4. The W-phase fixing hole section 55W1 has a hole through which the fixing screw 59 can be inserted. The W-phase extension 55W2 is shaped to correspond to part of the annular section of the yoke 40a. The W-phase extension 55W2 electrically couples the W-phase fixing hole section 55W1 to the first W-phase fusion terminal 55W3 and the second W-phase fusion terminal 55W4. Each of the first W-phase fusion terminal 55W3 and the second W-phase fusion terminal 55W4 is fused by the fusion process with the magnet wire 35 (which is in Fig. 9 (not shown), which forms the coils 34 and the connecting lines 34a, is connected. Each of the first W-phase fusion terminal 55W3 and the second W-phase fusion terminal 55W4 is electrically coupled to the coils 34 and the connecting lines 34a.

[0111] The U-phase power supply connector 61U has a U-phase fixing hole section 61U1 and a U-phase crimp section 61U2. The U-phase fixing hole section 61U1 has a hole through which the fixing screw 59 can be inserted. The U-phase crimp section 61U2 is designed to be crimped to a U-phase power wiring (not shown). The U-phase power wiring electrically couples the U-phase power supply connector 61U to the battery pack 3 via the controller 100.

[0112] The 61V V-phase power supply connector has a V-phase fixing hole section 61V1 and a V-phase crimp section 61V2. The V-phase fixing hole section 61V1 has a hole through which the fixing screw 59 can be inserted. The V-phase crimp section 61V2 is designed to be crimped to a V-phase power wiring (not shown). The V-phase power wiring electrically couples the 61V V-phase power supply connector to the battery pack 3 via the controller 100.

[0113] The W-phase power supply connector 61W has a W-phase fixing hole section 61W1 and a W-phase crimp section 61W2. The W-phase fixing hole section 61W1 has a hole through which the fixing screw 59 can be inserted. The W-phase crimp section 61W2 is designed to be crimped to a W-phase power wiring (not shown). The W-phase power wiring electrically couples the W-phase power supply connector 61W to the battery pack 3 via the controller 100.

[0114] The three fixing screws 59 fix the U-phase conductor component 55U, the V-phase conductor component 55V, the W-phase conductor component 55W, the U-phase power supply connection 61U, the V-phase power supply connection 61V, and the W-phase power supply connection 61W to the second insulator 52. The three fixing screws 59 electrically couple the U-phase conductor component 55U to the U-phase power supply connection 61U, the V-phase conductor component 55V to the V-phase power supply connection 61V, and the W-phase conductor component 55W to the W-phase power supply connection 61W. [2-1-7. Printed circuit board]

[0115] As in Fig. 3, Fig. 4 and Fig. As shown in Figure 8, the circuit board 62 is arranged on a front side of the first insulator 51. The circuit board 62 is fixed to the first insulator 51 by a screw 63.

[0116] As in Fig. As shown in Figure 8, three Hall-effect sensors 62a, corresponding to the U-phase, V-phase, and W-phase respectively, are mounted on a rear surface of the circuit board 62. The three Hall-effect 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-effect sensors 62a. [2-1-8. Installation sections of the stator core and the first insulator]

[0117] As in Fig. As shown in Figures 4 and 7 to 9, the yoke 40a of the stator core 40 has sections 40c. The sections 40c are arranged at specific intervals on an outer circumferential surface of the yoke 40a. The sections 40c project outwards from the yoke 40a. The sections 40c comprise two first sections 40c1 and two third sections 40c2. The two first sections 40c1 are arranged in a right-hand region of the outer circumferential surface of the yoke 40a. The two third sections 40c2 are arranged in a left-hand region of the outer circumferential surface of the yoke 40a.

[0118] As in Fig. 4, Fig. 8 and Fig. As shown in Figure 9, the first main section 51a of the first insulator 51 comprises system sections 51c. The system sections 51c are arranged at specific intervals on an outer circumferential surface of the first main section 51a. The system sections 51c comprise two second system sections 51c1 and two fourth system sections 51c2. The two second system sections 51c1 are arranged in a right-hand region of the outer circumferential surface of the first main section 51a. The two fourth system sections 51c2 are arranged on a left-hand region of the outer circumferential surface of the first main section 51a.

[0119] Each of the two second attachment sections 51c1 projects radially outwards on the outer circumferential surface of the first main section 51a. Each of the two fourth attachment sections 51c2 projects radially outwards on the outer circumferential surface of the first main section 51a. [2-1-9. Fixing the motor to the housing]

[0120] Referring to Fig. Sections 2 to 9 describe the fixing of the motor 25 (in detail, the stator 30 and the rotor 70) to the housing 90 (in detail, the right sub-housing 91 and the left sub-housing 92).

[0121] By mounting the right-hand housing section 91 to the motor 25 from the right side and then mounting the left-hand housing section 92 to the motor 25 from the left side, the motor 25 is fixed between the right-hand housing section 91 and the left-hand housing section 92. At this point, the stator 30 and the rotor 70 of the motor 25 are separately fixed to the housing 90.

[0122] The stator 30 is mounted on the right-hand sub-housing 91, with each of the first two system sections 40c1 in contact with or near contact with a corresponding first-hand section 91a, and each of the two second-hand system sections 51c1 in contact with or near contact with the second-hand section 91b. The stator 30 is mounted on the left-hand sub-housing 92, with each of the two third-hand system sections 40c2 in contact with or near contact with a corresponding third-hand section 92a, and each of the two fourth-hand system sections 51c2 in contact with or near contact with the fourth-hand section 92b.

[0123] If at least one of the two first system sections 40c1 is adjacent to the corresponding of the two first preceding sections 91a, or if at least one of the two third system sections 40c2 is adjacent to the corresponding of the two third preceding sections 92a, the movement of the stator 30 forward within the housing 90 is restricted.

[0124] If at least one of the two second system sections 51c1 is adjacent to the second preceding section 91b or at least one of the two fourth system sections 51c2 is adjacent to the fourth preceding section 92b, the movement of the stator 30 backwards within the housing 90 is restricted.

[0125] The stator 30 is mounted on the right-hand sub-housing 91, with each of the two first plant sections 40c1 in contact with, or close to contact with, a corresponding fifth-protruding section 91c. The stator 30 is mounted on the left-hand sub-housing 92, with each of the two third-protruding plant sections 40c2 in contact with, or close to contact with, a corresponding sixth-protruding section 92c.

[0126] If at least one of the two first system sections 40c1 is in contact with the corresponding of the two fifth preceding sections 91c, or if at least one of the two third system sections 40c2 is in contact with the corresponding of the two sixth preceding sections 92c, the circumferential movement of the stator 30 within the housing 90 is restricted. The circumferential movement restricted at this point includes movements in both the first and second directions of rotation (see Fig. 2).

[0127] This keeps the stator 30 in a constant axial and circumferential position relative to the housing 90.

[0128] The rotor 70 is mounted on the housing 90, with the front bearing 25a in contact with the front bearing contact section 91d1 of the front bearing support 91d and the front bearing contact section 92d1 of the front bearing support 92d, and the rear bearing 25b in contact with the rear bearing contact section 91e1 of the rear bearing support 91e and the rear bearing contact section 92e1 of the rear bearing support 92e. [2-1-10. Connection structure between coils and conductive components]

[0129] As in Fig. 10, Fig. 12 and Fig. As shown in Figure 13, the magnet wire 35, which forms the six coils 34, has a first end 35a and a second end 35b.

[0130] The first end 35a is coupled to (or connected to) the first W-phase fusion terminal 55W3 of the W-phase conductor component 55W. The second end 35b is coupled to (or connected to) the second W-phase fusion terminal 55W4 of the W-phase conductor component 55W.

[0131] As in Fig. As shown in Figure 11, the first W-phase fusion connection 55W3 is formed from a plate component 56, which is bent such that its cross-section has a U-shape. The plate component 56 has a closed end 56a of the U-shape and an open end 56b of the U-shape. The first W-phase fusion connection 55W3 is arranged such that a first direction of extension, which connects the closed end 56a and the open end 56b, is parallel to the axial direction of the axis of rotation AX.

[0132] The first W-phase fusion terminal 55W3 is coupled to (or connected to) the first end 35a, which is located in an interior 56c of the U-shape of the plate component 56. In detail, the first W-phase fusion terminal 55W3 and the first end 35a are electrically coupled to each other by the fusion process.

[0133] Similar to the first W-phase fusion connection 55W3, the second W-phase fusion connection 55W4 is formed from the plate component 56, which is bent such that its cross-section has a U-shape. Similar to the first W-phase fusion connection 55W3, the second W-phase fusion connection 55W4 is arranged such that the first direction of extension, which connects the closed end 56a and the open end 56b, is parallel to the axial direction of the axis of rotation AX.

[0134] The second W-phase fusion terminal 55W4 is coupled to (or connected to) the second end 35b, which is located inside 56c of the U-shape of the plate component 56. Specifically, the second W-phase fusion terminal 55W4 and the second end 35b are electrically coupled to each other through the fusion process.

[0135] As in Fig. 10 and Fig. As shown in Figure 12, the first W-phase fusion terminal 55W3 and the second W-phase fusion terminal 55W4 are arranged at different positions in the circumferential direction along the annular section of the yoke 40a (in other words, the circumferential direction of the axis of rotation AX) (or offset from each other).

[0136] In particular, the first W-phase fusion connection 55W3 is arranged such that one of the teeth 40b lies circumferentially along the annular section of the yoke 40a between the first W-phase fusion connection 55W3 and the second W-phase fusion connection 55W4. In other words, a gap between the first W-phase fusion connection 55W3 and the second W-phase fusion connection 55W4 in the circumferential direction is greater than or equal to the width of one of the teeth 40b in the circumferential direction. Here, one of the teeth 40b corresponds to the W-phase coil 34W2. In other words, the first W-phase fusion terminal 55W3 is arranged such that the W-phase coil 34W2 lies in the circumferential direction along the annular section of the yoke 40a between the first W-phase fusion terminal 55W3 and the second W-phase fusion terminal 55W4.

[0137] As in Fig. As shown in Figure 10, the first end 35a (or the first W-phase fusion terminal 55W3) is aligned to the second end 35b (or the second W-phase fusion terminal 55W4) transversely to the axial direction of the axis of rotation AX (i.e. in the ‘top-down direction’ indicated by arrows in the figure).

[0138] Furthermore, each of the first end 35a and the second end 35b (or each of the first W-phase fusion terminal 55W3 and the second W-phase fusion terminal 55W4) overlaps an axially extended area of ​​the coils 34 viewed from a direction perpendicular to the axis of rotation AX.

[0139] In the stator 30, which is designed as above, the first end 35a and the second end 35b are not offset from each other in the axial direction of the axis of rotation AX.

[0140] Furthermore, in the stator 30, one of the teeth 40b lies in the circumferential direction along the annular section of the yoke 40a between the first W-phase fusion terminal 55W3 and the second W-phase fusion terminal 55W4. Thus, it is possible to ensure a certain distance or more between the first W-phase fusion terminal 55W3 and the second W-phase fusion terminal 55W4.

[0141] The V-phase fusion connection 55V3 and the U-phase fusion connection 55U3 are each also formed from the plate component 56, which is bent in such a way that its cross-section has a U-shape, similar to the first W-phase fusion connection 55W3. [2-1-11. Electrical connection between coils and conductive component]

[0142] As in Fig. As shown schematically in Figure 13, the single wire 35 forming the coils 34 is arranged from the second end 35b in the sequence of a U-phase coil 34U1 (#1), a U-phase coil 34U2 (#4), a V-phase coil 34V2 (#5), a V-phase coil 34V1 (#2), a W-phase coil 34W1 (#3) and a W-phase coil 34W2 (#6), so that it reaches the first end 35a.

[0143] In Fig. Figure 13 shows the coils 34, the magnet wire 35, and the conductive components 55, with one upper side of the figure representing a rear side of the electric machine 1 and one lower side representing a front side of the electric machine 1. In other words, in Fig. 13 are sections of the magnet wire 35 shown below the coils 34, the connecting lines 34a which are arranged closer to the front side than the coils 34.

[0144] A section of the magnet wire 35, located between the V-phase coil 34V1 (#2) and the W-phase coil 34W1 (#3), is connected to the V-phase fusion terminal 55V3. A section of the magnet wire 35, located between the U-phase coil 34U2 (#4) and the V-phase coil 34V2 (#5), is connected to the U-phase fusion terminal 55U3. [2-1-12. Process for coupling conductive components to coils]

[0145] A process for coupling the conductive components 55 to the coils 34 (in other words, the magnet wire 35) is described.

[0146] First, the conductive components 55 (i.e., the U-phase conductor component 55U, the V-phase conductor component 55V, and the W-phase conductor component 55W) are arranged with respect to the first insulator 51, the stator core 40, and the second insulator 52, which are mounted together. Specifically, the conductive components 55 are stacked on the yoke 40a above the second insulator 52 in the axial direction of the axis of rotation AX.

[0147] The first W-phase fusion terminal 55W3 is located in a position different from the second W-phase fusion terminal 55W4 in the circumferential direction along the annular section of the yoke 40a (in other words, the circumferential direction of the axis of rotation AX).

[0148] Furthermore, the first W-phase fusion terminal 55W3 is aligned with the second W-phase fusion terminal 55W4 transversely to the axial direction of the rotation axis AX.

[0149] Next, the magnet wire 35 is wound around the stator teeth (i.e., teeth 40b, the first teeth 51b, and the second teeth 52b) to form the coils 34. At this point, the magnet wire 35 is inserted through the U-phase fusion terminal 55U3 and the V-phase fusion terminal 55V3 in the middle of the winding.

[0150] Next, a task to couple the first W-phase fusion terminal 55W3 to the first end 35a and a task to couple the second W-phase fusion terminal 55W4 to the second end 35b are performed. First, the first end 35a and the second end 35b are inserted by the first W-phase fusion terminal 55W3 and the second W-phase fusion terminal 55W4, respectively. After insertions, the fusion processes are performed to complete the task of coupling the first W-phase fusion terminal 55W3 to the first end 35a and the task of coupling the second W-phase fusion terminal 55W4 to the second end 35b.

[0151] At this point, the first end 35a and the second end 35b overlap the axially extended area of ​​the coils 34 viewed from the direction perpendicular to the axial direction of the axis of rotation AX.

[0152] The tasks of coupling the first W-phase fusion terminal 55W3 to the first end 35a and the second W-phase fusion terminal 55W4 to the second end 35b can be performed in any order. The fusion processes can be performed together with a task of coupling the U-phase fusion terminal 55U3 to the magnet wire 35 and a task of coupling the V-phase fusion terminal 55V3 to the magnet wire 35.

[0153] Consequently, the process of coupling the conductive components 55 to the coils 34 (in other words, the magnet wire 35) is completed. [2-1-13. Effects]

[0154] The first embodiment described above achieves the following effects.

[0155] (1) As described above, in the stator 30 the first end 35a is aligned to the second end 35b transversely to the axial direction of the axis of rotation AX.

[0156] Thus, the dimension of the motor 25 in the axial direction can be reduced compared to one in which the first end 35a and the second end 35b are offset from each other in the axial direction of the axis of rotation AX.

[0157] Therefore, the increase in size of the electric work machine 1 can be prevented.

[0158] (2) In the stator 30, one of the teeth 40b lies in the circumferential direction along the annular section of the yoke 40a between the first W-phase fusion terminal 55W3 and the second W-phase fusion terminal 55W4. Thus, it is possible to ensure a certain distance or more between the first W-phase fusion terminal 55W3 and the second W-phase fusion terminal 55W4.

[0159] Thus, in the electric machine 1, it can be easily ensured a working area for coupling the first W-phase fusion terminal 55W3 to the first end 35a and a working area for coupling the second W-phase fusion terminal 55W4 to the second end 35b. Consequently, it is possible to reduce the complexity of coupling the first end 35a and the second end 35b to the first W-phase fusion terminal 55W3 and the second W-phase fusion terminal 55W4, respectively.

[0160] (3) In the electric machine 1, the Hall-effect sensors 62a and the conductive components 55 are arranged such that the stator core 40 is inserted between them. In detail, the conductive components 55, the stator core 40, and the Hall-effect sensors 62a are arranged in this order from the rear side to the front side in the axial direction of the axis of rotation AX.

[0161] In other words, the Hall effect sensors 62a and the conductive components 55 are arranged opposite each other in the axial direction of the axis of rotation AX with the stator core 40 between them.

[0162] Therefore, in the electric working machine 1 it is possible to prevent the conductive components 55 and the Hall effect sensors 62a from interfering with each other, and to prevent the dimension of the motor 25 from increasing in the axial direction.

[0163] (4) The first W-phase fusion terminal 55W3 and the second W-phase fusion terminal 55W4 overlap the stator core 40 when viewed from the axial direction of the axis of rotation AX. In such an embodiment, it is possible to prevent the first W-phase fusion terminal 55W3 and the second W-phase fusion terminal 55W4 from being arranged radially outside the stator core 40.

[0164] Since the dimension of the motor 25 in the direction perpendicular to the axial direction (in other words, the radial direction of the axis of rotation AX) in the electric machine 1 can be reduced, it is possible to prevent it from increasing in terms of the size of the electric machine 1. [2-1-14. Correspondence between concepts]

[0165] Motor 25 corresponds to an example of the brushless DC motor in the overview of embodiments.

[0166] The first W-phase fusion terminal 55W3 corresponds to an example of the first connector in the overview of embodiments. The second W-phase fusion terminal 55W4 corresponds to an example of the second connector in the overview of embodiments. The U-phase fixing hole section 55U1, the V-phase fixing hole section 55V1, and the W-phase fixing hole section 55W1 correspond to an example of power consumption in the overview of embodiments.

[0167] The Hall effect sensors 62a correspond to an example of the rotary position sensor in the overview of embodiments. [2-2. Second embodiment][2-2-1. Differences from first embodiment]

[0168] The second embodiment has a basic design similar to that of the first embodiment, and the following describes the differences from the first embodiment. The same reference numerals as in the first embodiment indicate the same components, and reference is made to the preceding descriptions.

[0169] A second electric machine 101 of the second embodiment differs from the electric machine 1 of the first embodiment in that the second electric machine 101 has second conductive components 155 instead of the conductive components 55. [2-2-2. Second conductive components]

[0170] As in Fig. As shown in Figures 14 to 16, the second conductive components 155 differ from the conductive components 55 in that the second conductive components 155 comprise a second W-phase conductive component 155W instead of the W-phase conductive component 55W. In other words, the second conductive components 155 comprise the U-phase conductive component 55U, the V-phase conductive component 55V, and the second W-phase conductive component 155W.

[0171] The second W-phase conductor component 155W is arranged above the second insulator 52 on the rear side of the yoke 40a of the stator core 40. The second W-phase conductor component 155W is shaped such that it corresponds to part of the annular section of the yoke 40a.

[0172] The second W-phase conductor component 155W has a second W-phase fixing hole section 155W1, a second W-phase extension 155W2, a third W-phase fusion terminal 155W3, and a fourth W-phase fusion terminal 155W4. The second W-phase fixing hole section 155W1 has a hole through which the fixing screw 59 can be inserted. The second W-phase extension 155W2 is shaped to correspond to part of the annular section of the yoke 40a. The second W-phase extension 155W2 electrically couples the second W-phase fixing hole section 155W1 to the third W-phase fusion terminal 155W3 and the fourth W-phase fusion terminal 155W4. The third W-phase fusion terminal 155W3 and the fourth W-phase fusion terminal 155W4 are coupled to the magnet wire 35 by the fusion processes.The third W-phase fusion terminal 155W3 and the fourth W-phase fusion terminal 155W4 are electrically coupled to the coils 34 and the connecting lines 34a. [2-2-3. Connection structure of the coils and conductive components]

[0173] As in Fig. As shown in Figure 14, the first end 35a of the magnet wire 35 is coupled to the third W-phase fusion terminal 155W3 of the second W-phase conductor component 155W. The second end 35b is coupled to the fourth W-phase fusion terminal 155W4 of the second W-phase conductor component 155W.

[0174] As in Fig. As shown in Figure 15, the third W-phase fusion connection 155W3 is formed from the plate component 56, which is bent such that its cross-section has a U-shape. The plate component 56 has the closed end 56a of the U-shape and the open end 56b of the U-shape. The third W-phase fusion connection 155W3 is arranged such that the first direction of extension, which connects the closed end 56a and the open end 56b, is parallel to the axial direction of the axis of rotation AX.

[0175] The third W-phase fusion terminal 155W3 is coupled to the first end 35a, which is located inside 56c of the U-shape of the plate component 56. In detail, the third W-phase fusion terminal 155W3 and the first end 35a are electrically coupled to each other by the fusion process.

[0176] The fourth W-phase fusion connection 155W4 adjoins the third W-phase fusion connection 155W3. Similar to the third W-phase fusion connection 155W3, the fourth W-phase fusion connection 155W4 is formed from the plate component 56, which is bent such that its cross-section has a U-shape. Similar to the third W-phase fusion connection 155W3, the fourth W-phase fusion connection 155W4 is arranged such that the first direction of extension, which connects the closed end 56a and the open end 56b, is parallel to the axial direction of the axis of rotation AX.

[0177] The fourth W-phase fusion terminal 155W4 is coupled to the second end 35b, which is located inside 56c of the U-shape of the plate component 56. In detail, the fourth W-phase fusion terminal 155W4 and the second end 35b are electrically coupled to each other by the fusion process.

[0178] As in Fig. As shown in Figure 14, the third W-phase fusion terminal 155W3 is offset from the fourth W-phase fusion terminal 155W4 in the circumferential direction along the annular section of the yoke 40a (in other words, in the circumferential direction of the axis of rotation AX). In particular, the third W-phase fusion terminal 155W3 borders the fourth W-phase fusion terminal 155W4 in the circumferential direction along the annular section of the yoke 40a.

[0179] The third W-phase fusion terminal 155W3 and the fourth W-phase fusion terminal 155W4 are located between two of the teeth 40b that are adjacent in the circumferential direction along the annular section of the yoke 40a. The two adjacent teeth 40b are one corresponding to the U-phase coil 34U1 and the other corresponding to the W-phase coil 34W2. In other words, the third W-phase fusion terminal 155W3 is positioned such that neither of the teeth 40b lies in the circumferential direction along the annular section of the yoke 40a between the third W-phase fusion terminal 155W3 and the fourth W-phase fusion terminal 155W4. In other words, a gap between the third W-phase fusion connection 155W3 and the fourth W-phase fusion connection 155W4 in the circumferential direction is smaller than the width of one of the teeth 40b in the circumferential direction.

[0180] In the present second embodiment, the first end 35a is aligned with the second end 35b transversely to the axial direction of the axis of rotation AX (i.e., in the top-down direction in the figure), as in the first embodiment. Furthermore, the first end 35a and the second end 35b overlap the axially extended area of ​​the coils 34 when viewed from the direction perpendicular to the axis of rotation AX.

[0181] In the stator 30, which has the second W-phase line component 155W, the first end 35a and the second end 35b are not offset from each other in the axial direction of the axis of rotation AX.

[0182] Furthermore, in the present second embodiment, none of the teeth 40b lie in the circumferential direction along the annular section of the yoke 40a between the third W-phase fusion connection 155W3 and the fourth W-phase fusion connection 155W4.

[0183] With this design, the magnetic wire 35 can be laid in such a way that the first end 35a and the second end 35b are positioned in close proximity to each other. [2-2-4. Electrical design between coils and conductive components]

[0184] As in Fig. As shown schematically in Figure 16, the single wire 35, which forms the coils 34, is arranged from the second end 35b in the sequence of the U-phase coil 34U1 (#1), the U-phase coil 34U2 (#4), the V-phase coil 34V2 (#5), the V-phase coil 34V1 (#2), the W-phase coil 34W1 (#3) and the W-phase coil 34W2 (#6), so that it reaches the first end 35a.

[0185] In Fig. Figure 16 shows the coils 34, the magnet wire 35, and the second conductive components 155, with the upper side of the figure representing the rear side of the second electric machine 101 and the lower side representing the front side of the second electric machine 101. In other words, in Fig. 16 are sections of the magnet wire 35 shown below the coils 34, the connecting lines 34a which are arranged closer to the front side than the coils 34.

[0186] A section of the magnet wire 35, located between the V-phase coil 34V1 (#2) and the W-phase coil 34W1 (#3), is connected to the V-phase fusion terminal 55V3. A section of the magnet wire 35, located between the U-phase coil 34U2 (#4) and the V-phase coil 34V2 (#5), is connected to the U-phase fusion terminal 55U3. [2-2-5. Process for coupling conductive components to coils]

[0187] A process for coupling the second conductive components 155 to the coils 34 (in other words, the magnet wire 35) is described.

[0188] First, the second conductive components 155 (i.e., the U-phase conductor component 55U, the V-phase conductor component 55V, and the second W-phase conductor component 155W) are arranged relative to the first insulator 51, the stator core 40, and the second insulator 52, which are mounted together. Specifically, the second conductive components 155 are stacked on the yoke 40a above the second insulator 52 in the axial direction of the axis of rotation AX.

[0189] The third W-phase fusion terminal 155W3 is offset from the fourth W-phase fusion terminal 155W4 in the circumferential direction along the annular section of the yoke 40a (in other words, in the circumferential direction of the axis of rotation AX).

[0190] Furthermore, the third W-phase fusion terminal 155W3 is aligned with the fourth W-phase fusion terminal 155W4 transversely to the axial direction of the rotation axis AX.

[0191] Next, the magnet wire 35 is wound around the stator teeth (i.e., teeth 40b, the first teeth 51b, and the second teeth 52b) to form the coils 34. At this point, the magnet wire 35 is inserted through the U-phase fusion terminal 55U3 and the V-phase fusion terminal 55V3 in the middle of the winding.

[0192] Next, a task to couple the third W-phase fusion terminal 155W3 to the first end 35a and a task to couple the fourth W-phase fusion terminal 155W4 to the second end 35b are performed. First, the first end 35a and the second end 35b are inserted by the third W-phase fusion terminal 155W3 and the fourth W-phase fusion terminal 155W4, respectively. After insertion, the fusion processes are performed to complete the task of coupling the third W-phase fusion terminal 155W3 to the first end 35a and the task of coupling the fourth W-phase fusion terminal 155W4 to the second end 35b.

[0193] At this point, the first end 35a and the second end 35b overlap the axially extended area of ​​the coils 34 viewed from the direction perpendicular to the axial direction of the axis of rotation AX.

[0194] The tasks of coupling the third W-phase fusion terminal 155W3 to the first end 35a and the fourth W-phase fusion terminal 155W4 to the second end 35b can be performed in any order. The fusion processes can be performed together with a task of coupling the U-phase fusion terminal 55U3 to the magnet wire 35 and a task of coupling the V-phase fusion terminal 55V3 to the magnet wire 35.

[0195] Consequently, the process of coupling the second conductive components 155 to the coils 34 (in other words, the magnet wire 35) is completed. [2-2-6. Effects] (1) The second embodiment described above achieves the same effects as the first embodiment described above. (2) In the second embodiment, none of the teeth 40b (in other words, none of the coils 34) lie in the circumferential direction along the annular section of the yoke 40a between the third W-phase fusion terminal 155W3 and the fourth W-phase fusion terminal 155W4. Thus, the third W-phase fusion terminal 155W3 and the fourth W-phase fusion terminal 155W4 can be positioned in close proximity to each other, and the magnet wire 35 can be laid such that the first end 35a and the second end 35b are positioned in close proximity to each other.

[0196] Consequently, the second electric working machine 101 of the present second embodiment can employ the same routing path for the magnet wire 35 as if the first end 35a and the second end 35b were connected to a single connector. Thus, when changing the number of connectors from one to two, the workload for changing the routing path of the magnet wire 35 using the second W-phase conductor component 155W (in other words, the conductor component that has the third W-phase fusion terminal 155W3 and the fourth W-phase fusion terminal 155W4) can be reduced. [2-2-7. Correspondence between concepts]

[0197] The third W-phase fusion terminal 155W3 corresponds to an example of the first connector in the overview of embodiments. The fourth W-phase fusion terminal 155W4 corresponds to an example of the second connector in the overview of embodiments. The second W-phase fixing hole section 155W1 corresponds to an example of the power input in the overview of embodiments. [2-3. Third embodiment][2-3-1. Differences from first embodiment]

[0198] The present embodiment has a basic design similar to that of the first embodiment, and the following describes the differences from the first embodiment. The same reference numerals as in the first embodiment indicate the same components, and reference is made to the preceding descriptions.

[0199] As in Fig. As shown in Figures 17 to 20, a third electric machine 201 of the present third embodiment differs from the electric machine 1 of the first embodiment in that the third electric machine 201 has three conductive components 255 instead of the conductive components 55 and twelve coils 134 instead of the six coils 34. Furthermore, the first insulator 51, the stator core 40, and the second insulator 52 in the present third embodiment differ from those in the first embodiment in that they each have twelve teeth. The third electric machine 201 also has four insulating components 258. The first insulator 51, the stator core 40, and the second insulator 52 in the third embodiment are not shown in the figures.

[0200] The present third embodiment represents an exemplary brushless eight-pole twelve-slot three-phase DC motor. [2-3-2. Third conductive components]

[0201] As in Fig. As shown in Figures 17 to 20, the third conductive components 255 comprise a third U-phase conductor component 255U, a third V-phase conductor component 255V and a third W-phase conductor component 255W.

[0202] The third U-phase conductor 255U, the third V-phase conductor 255V, and the third W-phase conductor 255W are arranged above the second insulator 52 on the rear side of the yoke 40a of the stator core 40. The third U-phase conductor 255U, the third V-phase conductor 255V, and the third W-phase conductor 255W are each shaped to correspond to a portion of the annular section of the yoke 40a.

[0203] As will be described later, the third U-phase conductor component 255U, the third V-phase conductor component 255V and the third W-phase conductor component 255W are stacked in the third electric working machine 201 from the rear side to the front side and are electrically isolated from each other by the four insulating components 258.

[0204] As in Fig. As shown in Figure 18A, the third U-phase conductor component 255U comprises a third U-phase fixing hole section 255U1, a third U-phase extension 255U2, a first U-phase fusion terminal 255U3, a second U-phase fusion terminal 255U4, and a third U-phase fusion terminal 255U5. The third U-phase fixing hole section 255U1 has a hole through which the fixing screw 59 can be inserted. The third U-phase extension 255U2 is shaped to correspond to part of the annular section of the yoke 40a. The third U-phase extension 255U2 electrically couples the third U-phase fixing hole section 255U1 to the first U-phase fusion terminal 255U3, the second U-phase fusion terminal 255U4 and the third U-phase fusion terminal 255U5.

[0205] The first U-phase fusion terminal 255U3, the second U-phase fusion terminal 255U4, and the third U-phase fusion terminal 255U5 are each coupled by the fusion process to a second magnet wire 135, which forms twelve second coils 134 and second connecting lines 134a. In other words, the first U-phase fusion terminal 255U3, the second U-phase fusion terminal 255U4, and the third U-phase fusion terminal 255U5 are each electrically coupled to the twelve second coils 134 and the second connecting lines 134a.

[0206] Similar to the connecting lines 34a, the second connecting lines 134a each lie between a second coil 134 and another second coil 134 and are supported by the first insulator 51 (not shown).

[0207] As in Fig. As shown in Figure 18B, the third V-phase conductor component 255V has a third V-phase fixing hole section 255V1, a third V-phase extension 255V2, a first V-phase fusion terminal 255V3, and a second V-phase fusion terminal 255V4. The third V-phase fixing hole section 255V1 has a hole through which the fixing screw 59 can be inserted. The third V-phase extension 255V2 is shaped to correspond to part of the annular section of the yoke 40a. The third V-phase extension 255V2 electrically couples the third V-phase fixing hole section 255V1 to the first V-phase fusion terminal 255V3 and the second V-phase fusion terminal 255V4.

[0208] The first V-phase fusion terminal 255V3 and the second V-phase fusion terminal 255V4 are each coupled to the second magnet wire 135 by the fusion process. In other words, the first V-phase fusion terminal 255V3 and the second V-phase fusion terminal 255V4 are each electrically coupled to the twelve second coils 134 and the second connecting lines 134a.

[0209] As in Fig. As shown in Figure 18C, the third W-phase conductor component 255W has a third W-phase fixing hole section 255W1, a third W-phase extension 255W2, a fifth W-phase fusion terminal 255W3, and a sixth W-phase fusion terminal 255W4. The third W-phase fixing hole section 255W1 has a hole through which the fixing screw 59 can be inserted. The third W-phase extension 255W2 is shaped to correspond to part of the annular section of the yoke 40a. The third W-phase extension 255W2 electrically couples the third W-phase fixing hole section 255W1 to the fifth W-phase fusion terminal 255W3 and the sixth W-phase fusion terminal 255W4.

[0210] The fifth W-phase fusion terminal 255W3 and the sixth W-phase fusion terminal 255W4 are each coupled to the second magnet wire 135 by the fusion process. In other words, the fifth W-phase fusion terminal 255W3 and the sixth W-phase fusion terminal 255W4 are each electrically coupled to the twelve second coils 134 and the second connecting lines 134a.

[0211] Although not shown, the first U-phase fusion terminal 255U3, the second U-phase fusion terminal 255U4, the third U-phase fusion terminal 255U5, the first V-phase fusion terminal 255V3, the second V-phase fusion terminal 255V4, the fifth W-phase fusion terminal 255W3 and the sixth W-phase fusion terminal 255W4 are each formed from the plate component 56 described above.

[0212] As in Fig. As shown in Figure 19 as a schematic exploded view, the four insulating components 258 are configured to electrically isolate the third U-phase conductor component 255U, the third V-phase conductor component 255V, and the third W-phase conductor component 255W from one another. Each of the four insulating components 258 is made of an insulating material. Each of the four insulating components 258 is formed in an annular shape that follows the annular section of the yoke 40a.

[0213] The first of the four insulating components 258 is arranged between the third V-phase conductor 255V and the third W-phase conductor 255W. The second of the four insulating components 258 is arranged between the third U-phase conductor 255U and the third V-phase conductor 255V. The third of the four insulating components 258 is arranged on one side of the third U-phase conductor 255U, opposite to the side facing the third V-phase conductor 255V. The fourth of the four insulating components 258 is arranged on one side of the third W-phase conductor 255W, opposite to the side facing the third V-phase conductor 255V.

[0214] In other words, the third U-phase conductor component 255U, the third V-phase conductor component 255V and the third W-phase conductor component 255W and the four insulating components 258 are arranged over the second insulator 52 on the rear side of the yoke 40a of the stator core 40.

[0215] In other words, the third U-phase conductor component 255U, the third V-phase conductor component 255V and the third W-phase conductor component 255W are stacked in the third electric working machine 201 from the back to the front and are electrically isolated from each other by the four insulating components 258.

[0216] The insulating component 258, which is located on the front side of the third W-phase conductor component 255W, is stacked on the second insulator 52 and thus in contact with it. In other words, this insulating component 258 is stacked on the second insulator 52 on one side of the second insulator 52 opposite to the side that is opposite the stator core 40 in the axial direction of the axis of rotation AX.

[0217] The third U-phase conductor component 255U, the third V-phase conductor component 255V and the third W-phase conductor component 255W are not necessarily stacked in the third electric working machine 201 in this order from the back to the front and can be stacked in this order from the front to the back.

[0218] The third W-phase conductor 255W is not necessarily stacked indirectly in contact with the second insulator 52 via the insulating component 258. The third W-phase conductor 255W can be stacked directly in contact with the second insulator 52 without the insulating component 258. In other words, the third W-phase conductor 255W can be stacked directly in contact with the second insulator 52 on one side of the second insulator 52 opposite the side facing the stator core 40 in the axial direction of the axis of rotation AX.

[0219] An assembly process for assembling the third U-phase conductor component 255U, the third V-phase conductor component 255V, the third W-phase conductor component 255W and the four insulating components 258 together can include individually forming these components beforehand and stacking the components in the configuration described above.

[0220] Alternatively, the assembly process can include arranging the third U-phase conductor component 255U, the third V-phase conductor component 255V, and the third W-phase conductor component 255W separately within a mold, pouring liquid insulating material into the mold, and allowing the insulating material to solidify to form four insulating components 258. In this case, an insulating connector designed to couple the four insulating components 258 together can be provided. The insulating connector can be arranged in a stacking direction for the four insulating components 258 to couple them together. The insulating connector can be provided as a component for bringing together the third U-phase conductor component 255U, the third V-phase conductor component 255V, the third W-phase conductor component 255W and the four insulating components 258. [2-3-3. Electrical connection between coils and conductive components]

[0221] As in Fig. As shown schematically in Figure 20, the twelve second coils 134 comprise the first to twelfth coils C1 to C12. The first to twelfth coils C1 to C12 are formed from a single second magnet wire 135. The second magnet wire 135 has a first end 135a and a second end 135b. Starting from the first end 135a, the second magnet wire 135 is arranged in the sequence of the first coil C1, the fourth coil C4, the fifth coil C5, the eighth coil C8, the ninth coil C9, the twelfth coil C12, the seventh coil C7, the tenth coil C10, the eleventh coil C11, the second coil C2, the third coil C3, and the sixth coil C6, so that it reaches the second end 135b.

[0222] The wire laying sequence, when the first to twelfth coils C1 to C12 are formed from the single second wire 135, is not limited to the sequence described above and can be other sequences. In other words, the sequence for forming the first to twelfth coils C1 to C12 can be defined as desired.

[0223] The first end 135a of the second magnet wire 135 is coupled to the second U-phase fusion terminal 255U4. The second end 135b of the second magnet wire 135 is coupled to the third U-phase fusion terminal 255U5.

[0224] A section of the second magnet wire 135 between the fourth coil C4 and the fifth coil C5 is coupled to the fifth W-phase fusion terminal 255W3. A section of the second magnet wire 135 between the eighth coil C8 and the ninth coil C9 is coupled to the second V-phase fusion terminal 255V4. A section of the second magnet wire 135 between the twelfth coil C12 and the seventh coil C7 is coupled to the first U-phase fusion terminal 255U3. A section of the second magnet wire 135 between the tenth coil C10 and the eleventh coil C11 is coupled to the sixth W-phase fusion terminal 255W4. A section of the second magnet wire 135 between the second coil C2 and the third coil C3 is coupled to the first V-phase fusion terminal 255V3.

[0225] The second connecting lines 134a correspond to sections of the second magnet wire 135 between the first coil C1 and the fourth coil C4, between the fifth coil C5 and the eighth coil C8, between the ninth coil C9 and the twelfth coil C12, between the seventh coil C7 and the tenth coil C10, between the eleventh coil C11 and the second coil C2 and between the third coil C3 and the sixth coil C6. [2-3-4. Process for coupling conductive components to coils]

[0226] A process for coupling the third conductive components 255 to the second coils 134 (in other words, the second magnet wire 135) is described.

[0227] First, the third conductive components 255 (i.e., the third U-phase conductor component 255U, the third V-phase conductor component 255V, and the third W-phase conductor component 255W) are arranged relative to the first insulator 51, the stator core 40, and the second insulator 52, which are mounted together. Specifically, the third conductive components 255 are arranged above the second insulator 52 in the axial direction of the axis of rotation AX on the yoke 40a.

[0228] The second U-phase fusion terminal 255U4 is offset from the third U-phase fusion terminal 255U5 in the circumferential direction along the annular section of the yoke 40a (in other words, in the circumferential direction of the axis of rotation AX).

[0229] Furthermore, the second U-phase fusion terminal 255U4 is aligned with the third U-phase fusion terminal 255U5 transversely to the axial direction of the rotation axis AX.

[0230] Next, the second magnet wire 135 is wound around the stator teeth (i.e., teeth 40b, the first teeth 51b, and the second teeth 52b) to form the twelve second coils 134. At this point, in the middle of the winding of the second magnet wire 135, the second magnet wire 135 is inserted through the first V-phase fusion terminal 255V3, the fifth W-phase fusion terminal 255W3, the first U-phase fusion terminal 255U3, the second V-phase fusion terminal 255V4, and the sixth W-phase fusion terminal 255W4.

[0231] Next, a task to connect the second U-phase fusion terminal 255U4 to the first end 135a and a task to connect the third U-phase fusion terminal 255U5 to the second end 135b are performed. First, the first end 135a and the second end 135b are inserted by the second U-phase fusion terminal 255U4 and the third U-phase fusion terminal 255U5, respectively. After insertion, the fusion processes are performed to complete the task of connecting the second U-phase fusion terminal 255U4 to the first end 135a and the task of connecting the third U-phase fusion terminal 255U5 to the second end 135b.

[0232] At this point, the first end 135a and the second end 135b overlap the axially extended area of ​​the second coils 134 viewed from the direction perpendicular to the axial direction of the axis of rotation AX.

[0233] The tasks of coupling the second U-phase fusion terminal 255U4 to the first end 135a and the task of coupling the third U-phase fusion terminal 255U5 to the second end 135b can be performed in any order. The fusion processes can be performed together with tasks for coupling the other fusion terminals to the second magnet wire 135.

[0234] Consequently, the process of coupling the third conductive components 255 to the twelve second coils 134 (in other words, the second magnet wire 135) is completed. [2-3-5. Effects] (1) The third embodiment described above achieves the same effects as the first embodiment described above. (2) The third embodiment represents, by way of example, the brushless eight-pole, twelve-slot three-phase DC motor. Thus, axial dimensions can be reduced not only for brushless eight-pole, six-slot three-phase DC motors as in the first and second embodiments, but also for brushless eight-pole, twelve-slot three-phase DC motors. [2-3-6. Correspondence between concepts]

[0235] The second U-phase fusion terminal 255U4 corresponds to an example of the first connector in the overview of embodiments. The third U-phase fusion terminal 255U5 corresponds to an example of the second connector in the overview of embodiments. The third U-phase fixing hole section 255U1, the third V-phase fixing hole section 255V1, and the third W-phase fixing hole section 255W1 correspond to an example of power consumption in the overview of embodiments. [2-4. Fourth embodiment][2-4-1. Differences from the third embodiment]

[0236] The present fourth embodiment has a basic design similar to that of the third embodiment, and the following describes the differences from the third embodiment. The same reference numerals as in the third embodiment indicate the same components, and reference is made to the preceding descriptions.

[0237] As in Fig. As shown in Figures 21 to 24, the fourth electric machine 301 of the present fourth embodiment differs from the third electric machine 201 of the third embodiment in that the fourth electric machine 301 has fourth conductive components 355 instead of the third conductive components 255, and the twelve coils (in detail, the twelve third coils 234) are formed from two magnet wires (in detail, a third magnet wire 235 and a fourth magnet wire 236). Similar to the third electric machine 201, the fourth electric machine 301 has the four insulating components 258. [2-4-2. Fourth conductive components]

[0238] As in Fig. As shown in Figures 21 to 24, the fourth conductive components 355 comprise a fourth U-phase conductor component 355U, a fourth V-phase conductor component 355V and a fourth W-phase conductor component 355W.

[0239] The fourth U-phase conductor 355U, the fourth V-phase conductor 355V, and the fourth W-phase conductor 355W are arranged above the second insulator 52 on the rear side of the yoke 40a of the stator core 40. The fourth U-phase conductor 355U, the fourth V-phase conductor 355V, and the fourth W-phase conductor 355W are each shaped to correspond to a portion of the annular section of the yoke 40a.

[0240] As will be described later, the fourth U-phase line component 355U, the fourth V-phase line component 355V and the fourth W-phase line component 355W are stacked in the fourth electric working machine 301 from the rear side to the front side and are electrically insulated from each other by the insulating components 258.

[0241] As in Fig. As shown in Figure 22A, the fourth U-phase conductor component 355U has a fourth U-phase fixing hole section 355U1, a fourth U-phase extension 355U2, a third U-phase fusion terminal 355U3, and a fourth U-phase fusion terminal 355U4. The fourth U-phase fixing hole section 355U1 has a hole through which the fixing screw 59 can be inserted. The fourth U-phase extension 355U2 is shaped to correspond to part of the annular section of the yoke 40a. The fourth U-phase extension 355U2 electrically couples the fourth U-phase fixing hole section 355U1 to the third U-phase fusion terminal 355U3 and the fourth U-phase fusion terminal 355U4. The third U-phase fusion terminal 355U3 and the fourth U-phase fusion terminal 355U4 are each coupled to the third magnet wire 235 by the fusion process.In other words, the third U-phase fusion terminal 355U3 and the fourth U-phase fusion terminal 355U4 are each electrically coupled to the twelve third coils 234 and the third connecting lines 234a.

[0242] Similar to the second connecting lines 134a, the second connecting lines 234a each lie between a third coil 234 and another third coil 234 and are supported by the first insulator 51 (not shown).

[0243] As in Fig. As shown in Figure 22B, the fourth V-phase conductor component 355V has a fourth V-phase fixing hole section 355V1, a fourth V-phase extension 355V2, a third V-phase fusion terminal 355V3, a fourth V-phase fusion terminal 355V4, and a fifth V-phase fusion terminal 355V5. The fourth V-phase fixing hole section 355V1 has a hole through which the fixing screw 59 can be inserted. The fourth V-phase extension 355V2 is shaped to correspond to part of the annular section of the yoke 40a. The fourth V-phase extension 355V2 electrically couples the fourth V-phase fixing hole section 355V1 to the third V-phase fusion terminal 355V3, the fourth V-phase fusion terminal 355V4 and the fifth V-phase fusion terminal 355V5.

[0244] The third V-phase fusion terminal 355V3 is coupled to the fourth magnet wire 236 through the fusion process. The fourth V-phase fusion terminal 355V4 and the fifth V-phase fusion terminal 355V5 are coupled to the third magnet wire 235 through the fusion process. In other words, the third V-phase fusion terminal 355V3, the fourth V-phase fusion terminal 355V4, and the fifth V-phase fusion terminal 355V5 are each electrically coupled to the twelve third coils 234 and the third connecting lines 234a.

[0245] As in Fig. As shown in Figure 22C, the fourth W-phase conductor component 355W has a fourth W-phase fixing hole section 355W1, a fourth W-phase extension 355W2, a seventh W-phase fusion terminal 355W3, an eighth W-phase fusion terminal 355W4, and a ninth W-phase fusion terminal 355W5. The fourth W-phase fixing hole section 355W1 has a hole through which the fixing screw 59 can be inserted. The fourth W-phase extension 355W2 is shaped to correspond to part of the annular section of the yoke 40a. The fourth W-phase extension 355W2 electrically couples the fourth W-phase fixing hole section 355W1 to the seventh W-phase fusion terminal 355W3, the eighth W-phase fusion terminal 355W4 and the ninth W-phase fusion terminal 355W5.

[0246] The seventh W-phase fusion terminal 355W3 and the eighth W-phase fusion terminal 355W4 are each coupled to the third magnet wire 235 through the fusion process. The ninth W-phase fusion terminal 355W5 is coupled to the fourth magnet wire 236 through the fusion process. In other words, the seventh W-phase fusion terminal 355W3, the eighth W-phase fusion terminal 355W4, and the ninth W-phase fusion terminal 355W5 are each electrically coupled to the twelve third coils 234 and the third connecting lines 234a.

[0247] Although not shown, the third U-phase fusion terminal 355U3, the fourth U-phase fusion terminal 355U4, the third V-phase fusion terminal 355V3, the fourth V-phase fusion terminal 355V4, the fifth V-phase fusion terminal 355V5, the seventh W-phase fusion terminal 355W3, the eighth W-phase fusion terminal 355W4 and the ninth W-phase fusion terminal 355W5 are each formed from the plate component 56 described above.

[0248] As in Fig. Figure 23, shown as a schematic exploded view, shows that the four insulating components 258 are designed to electrically insulate the fourth U-phase conductor component 355U, the fourth V-phase conductor component 355V, and the fourth W-phase conductor component 355W from one another. The four insulating components 258 are designed in the same way as the four insulating components 258 of the third embodiment.

[0249] The first of the four insulating components 258 is arranged between the fourth V-phase conductor 355V and the fourth W-phase conductor 355W. The second of the four insulating components 258 is arranged between the fourth U-phase conductor 355U and the fourth V-phase conductor 355V. The third of the four insulating components 258 is arranged on one side of the fourth U-phase conductor 355U, opposite to the side facing the fourth V-phase conductor 355V. The fourth of the four insulating components 258 is arranged on one side of the fourth W-phase conductor 355W, opposite to the side facing the fourth V-phase conductor 355V.

[0250] In other words, the fourth U-phase conductor component 355U, the fourth V-phase conductor component 355V, the fourth W-phase conductor component 355W and the four insulating components 258 are arranged over the second insulator 52 on the rear side of the yoke 40a of the stator core 40.

[0251] In other words, the fourth U-phase line component 355U, the fourth V-phase line component 355V and the fourth W-phase line component 355W are stacked in the fourth electric working machine 301 from the back to the front and are electrically isolated from each other by the four insulating components 258.

[0252] The insulating component 258, which is located on the front side of the fourth W-phase conductor component 355W, is stacked on the second insulator 52 and thus in contact with it. In other words, this insulating component 258 is stacked on the second insulator 52 on one side of the second insulator 52 opposite to the side that faces the stator core 40 in the axial direction of the axis of rotation AX.

[0253] The fourth U-phase line component 355U, the fourth V-phase line component 355V and the fourth W-phase line component 355W are not necessarily stacked in the fourth electric working machine 301 from the back to the front in this order and may be stacked in this order from the front to the back.

[0254] The fourth W-phase conductor 355W is not necessarily stacked over the insulating component 258 on the second insulator 52 in indirect contact with the second insulator 52. The fourth W-phase conductor 355W can be stacked on the second insulator 52 without the insulating component 258 and in direct contact with the second insulator 52. In other words, the fourth W-phase conductor 355W can be stacked on and in direct contact with the second insulator 52 on one side of the second insulator 52 opposite to the side that is opposite the stator core 40 in the axial direction of the axis of rotation AX.

[0255] An assembly process for joining the fourth U-phase conductor component 355U, the fourth V-phase conductor component 355V, the fourth W-phase conductor component 355W, and the four insulating components 258 can, as in the third embodiment, include individually forming these components beforehand and stacking the components in the configuration described above. Alternatively, the assembly process can include arranging the fourth U-phase conductor component 355U, the fourth V-phase conductor component 355V, and the fourth W-phase conductor component 355W apart from one another within a mold, pouring liquid insulating material into the mold, and solidifying the insulating material to form four insulating components 258. [2-4-3. Electrical connection between coils and conductive components]

[0256] As in Fig.As shown schematically in Figure 24, the twelve third coils 234 comprise the first to twelfth coils C1 to C12. Each of the first to twelfth coils 234 is formed from either the third magnet wire 235 or the fourth magnet wire 236.

[0257] The third magnet wire 235 has its first end 235a and its second end 235b. Starting from its first end 235a, the third magnet wire 235 is arranged in the sequence of the third coil C3, the sixth coil C6, the seventh coil C7, the tenth coil C10, the fifth coil C5, the eighth coil C8, the ninth coil C9, the twelfth coil C12, the first coil C1, and the fourth coil C4, so that it reaches its second end 235b. The fourth magnet wire 236 is arranged, starting from its first end 236a, in the sequence of the eleventh coil C11 (or the second coil C2) and the second coil C2 (or the eleventh coil C11), so that it reaches its second end 236b.

[0258] A wire laying sequence, if the first coil C1, the third to tenth coils C3 to C10, and the twelfth coil C12 are formed from the single third magnet wire 235, is not limited to the sequence above and can be other sequences. A wire laying sequence, if the eleventh coil C11 and the second coil C2 are formed from the single fourth magnet wire 236, is not limited to the sequence above and can be the sequence of the second coil C2 and the eleventh coil C11. In other words, the sequence for forming the first coil C1, the third to tenth coils C3 to C10, and the twelfth coil C12, and the sequence for forming the eleventh coil C11 and the second coil C2, are defined as desired.

[0259] The first end 235a of the third magnet wire 235 is connected to the third V-phase fusion terminal 355V3. The second end 235b of the third magnet wire 235 is connected to the ninth W-phase fusion terminal 355W5. The first end 236a of the fourth magnet wire 236 is connected to the fifth V-phase fusion terminal 355V5. The second end 236b of the fourth magnet wire 236 is connected to the eighth W-phase fusion terminal 355W4.

[0260] A section of the third magnet wire 235 between the sixth coil C6 and the seventh coil C7 is coupled to the third U-phase fusion terminal 355U3. A section of the third magnet wire 235 between the tenth coil C10 and the fifth coil C5 is coupled to the seventh W-phase fusion terminal 355W3. A section of the third magnet wire 235 between the eighth coil C8 and the ninth coil C9 is coupled to the fifth V-phase fusion terminal 355V5. A section of the third magnet wire 235 between the twelfth coil C12 and the first coil C1 is coupled to the fourth U-phase fusion terminal 355U4.

[0261] The third connecting lines 234a correspond to sections of the third magnet 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 lines 234a also correspond to the section of the fourth magnet wire 236 between the second coil C2 and the eleventh coil C11. [2-4-4. Process for coupling conductive components to coils]

[0262] A process for coupling the fourth conductive components 355 to the third coils 234 (in other words, the third magnet wire 235 and the fourth magnet wire 236) is described.

[0263] First, the fourth conductive components 355 (i.e., the fourth U-phase conductor component 355U, the fourth V-phase conductor component 355V, and the fourth W-phase conductor component 355W) are arranged relative to the first insulator 51, the stator core 40, and the second insulator 52, which are mounted together. Specifically, the fourth conductive components 355 are arranged above the second insulator 52 in the axial direction of the axis of rotation AX on the yoke 40a.

[0264] The eighth W-phase fusion terminal 355W4, the fifth V-phase fusion terminal 355V5 (or the fourth V-phase fusion terminal 355V4), the third V-phase fusion terminal 355V3 and the ninth W-phase fusion terminal 355W5 are offset from each other in the circumferential direction along the annular section of the yoke 40a (in other words, in the circumferential direction of the axis of rotation AX).

[0265] Furthermore, the eighth W-phase fusion terminal 355W4, the fifth V-phase fusion terminal 355V5 (or the fourth V-phase fusion terminal 355V4), the third V-phase fusion terminal 355V3 and the ninth W-phase fusion terminal 355W5 are aligned perpendicular to the axial direction of the rotation axis AX.

[0266] Next, the third magnet wire 235 and the fourth magnet wire 236 are wound around the stator teeth (i.e., teeth 40b, the first teeth 51b, and the second teeth 52b) to form the twelve third coils 234. At this point, the third magnet wire 235 is inserted through the fourth U-phase fusion terminal 355U4, the fourth V-phase fusion terminal 355V4 (or the fifth V-phase fusion terminal 355V5), the seventh W-phase fusion terminal 355W3, and the third U-phase fusion terminal 355U3 in the middle of the winding of the third magnet wire 235.

[0267] Next, a task to couple the first end 235a to the eighth W-phase fusion terminal 355W4 (or the third V-phase fusion terminal 355V3), a task to couple the second end 235b to the fifth V-phase fusion terminal 355V5 (or the ninth W-phase fusion terminal 355W5), a task to couple the first end 236a to the third V-phase fusion terminal 355V3 (or the fourth V-phase fusion terminal 355V4) and a task to couple the second end 236b to the ninth W-phase fusion terminal 355W5 (or the eighth W-phase fusion terminal 355W4) are performed.

[0268] First, the first end 235a, the second end 235b, the first end 236a and the second end 236b are inserted, respectively, by the eighth W-phase fusion terminal 355W4 (or the third V-phase fusion terminal 355V3), the fifth V-phase fusion terminal 355V5 (or the ninth W-phase fusion terminal 355W5), the third V-phase fusion terminal 355V3 (or the fourth V-phase fusion terminal 355V4) and the ninth W-phase fusion terminal 355W5 (or the eighth W-phase fusion terminal 355W4). After insertions, the fusion processes are carried out to complete the task of coupling the first end 235a to the eighth W-phase fusion terminal 355W4 (or the third V-phase fusion terminal 355V3), the task of coupling the second end 235b to the fifth V-phase fusion terminal 355V5 (orthe ninth W-phase fusion terminal 355W5), the task of coupling the first end 236a to the third V-phase fusion terminal 355V3 (or the fourth V-phase fusion terminal 355V4) and the task of coupling the second end 236b to the ninth W-phase fusion terminal 355W5 (or the eighth W-phase fusion terminal 355W4).

[0269] At this point, the first end 235a, the second end 235b, the first end 236a and the second end 236b overlap the axially extended area of ​​the third coils 234 viewed from the direction perpendicular to the axial direction of the axis of rotation AX.

[0270] One of the first end 235a, one of the second end 235b, one of the first end 236a and one of the second end 236b can initially be coupled to a corresponding fusion terminal, and the sequence from the second end onward can be determined as desired. The fusion processes can be carried out together with tasks for coupling the other fusion terminals to the third magnet wire 235.

[0271] Consequently, the process of coupling the fourth conductive components 355 to the twelve third coils 234 (in other words, the third magnet wire 235 and the fourth magnet wire 236) is completed. [2-4-5. Effects] (1) The fourth embodiment described above achieves the same effects as the third embodiment described above. (2) In the fourth embodiment, the twelve third coils 234 are formed from the third magnet wire 235 and the fourth magnet wire 236. The third magnet wire 235 has a first end 235a and a second end 235b. The fourth magnet wire 236 has a first end 236a and a second end 236b. The first end 235a, the second end 235b, the first end 236a, and the second end 236b are aligned perpendicular to the axial direction of the axis of rotation AX.

[0272] Thus, the axial dimension of the motor 25 can be reduced compared to one in which the first end 235a, the second end 235b, the first end 236a and the second end 236b are offset from each other in the axial direction.

[0273] Therefore, the increase in size of the fourth electric work machine 301 can be prevented. (3) The fourth V-phase line component 355V electrically couples the eighth coil C8 and the ninth coil C9 to each other. The fourth W-phase line component 355W electrically couples the tenth coil C10 and the eleventh coil C11 to each other. This design eliminates the need for jumper wires to electrically couple different coils. [2-4-6. Correspondence between concepts]

[0274] Each of the eighth W-phase fusion terminal 355W4 and the third V-phase fusion terminal 355V3 corresponds to an example of the first connector in the Overview of Embodiments. Each of the fifth V-phase fusion terminal 355V5 and the ninth W-phase fusion terminal 355W5 corresponds to an example of the second connector in the Overview of Embodiments. The fourth U-phase fixing hole section 355U1, the fourth V-phase fixing hole section 355V1, and the fourth W-phase fixing hole section 355W1 correspond to an example of the power input in the Overview of Embodiments. [2-5. Other embodiments]

[0275] The embodiments of the present disclosure have been described above. The present disclosure is not limited to the embodiments described above and can be implemented in various configurations. (a) The first to fourth embodiments described above describe configurations using a single magnet wire or two magnet wires. However, the present disclosure is not limited to these configurations. The coils can be formed from three or more magnet wires.

[0276] The coils can be formed from two or more, but a smaller number of, magnetic wires than the coils themselves. This design prevents the two ends (in other words, the first end and the second end) of the respective magnetic wires from being axially offset from each other. (b) In the first to fourth embodiments described above, the configurations with six coils or twelve coils are described. However, the present disclosure is not limited to these configurations. The number of coils can be any multiple of three, except for six and twelve. (c) The first to fourth embodiments described above describe the brushless eight-pole, six-slot, three-phase DC motors and the brushless eight-pole, twelve-slot, three-phase DC motor. However, the present disclosure is not limited to these embodiments. Brushless DC motors according to the present disclosure can have any number of poles and any number of teeth or slots. An example of a brushless DC motor according to the present disclosure can have twelve poles and nine slots. Another example of a brushless DC motor according to the present disclosure can have four poles and six slots. (d) Two or more functions achieved by one element of the embodiments described above can be achieved by two or more elements. One function achieved by one element can be achieved by two or more elements. Two or more functions achieved by two or more elements can be achieved by one element. One function achieved by two or more elements can be achieved by one element. Some of the features in the embodiments described above can be omitted. At least some of the features in one of the embodiments described above can be added to or replaced by some of the features in another of the embodiments described above.

[0277] It is explicitly emphasized that all features disclosed in the description and / or the claims are to be considered separate and independent of one another for the purposes of the original disclosure as well as for the purpose of limiting the claimed invention, irrespective of the combinations of features in the embodiments and / or the claims. It is explicitly stated that all range specifications or specifications of groups of units disclose every possible intermediate value or subgroup of units for the purposes of the original disclosure as well as for the purpose of limiting the claimed invention, in particular also as a boundary of a range specification. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 7242214

[0002]

Claims

[1] Electric working machine (1, 101, 201, 301) with: a brushless DC motor (25) comprising: a rotor (70) designed to rotate about an axis of rotation (AX); and a stator (30) surrounding the rotor, the stator having: a stator core (40) with a yoke (40a) surrounding the rotor and teeth (40b) projecting radially inwards from the yoke; an insulator (51, 52) covering at least a section of the stator core; Coils (34, 134, 234) formed from at least one magnet wire (35, 135, 235, 236) wound around the teeth over the insulator; and a conductive component (55, 155, 255, 355) with: a first connector (55W3, 155W3, 255U4, 355W4, 355V3) coupled to a first end (35a, 135a, 235a) of one of the at least one magnet wire; and a second connector (55W4, 155W4, 255U5, 355V5, 355W5) coupled to a second end (35b, 135b, 235b) of one of the at least one magnet wire, where the conductive component is stacked on the yoke in an axial direction of the axis of rotation above the insulator, in which the first connector is offset from the second connector in a circumferential direction of the axis of rotation, but is oriented perpendicular to the axial direction relative to the second connector, and where the first connector and the second connector overlap an axially extended area of ​​the coils when viewed from a direction perpendicular to the axial direction. [2] Electric working machine according to claim 1, wherein: the first connector and the second connector each are formed from a plate component (56) which is bent such that its cross-section has a U-shape, and a first extension direction which connects an open end (56b) and a closed end (56a) of the U-shape is arranged parallel to the axial direction; the first connector is coupled to the first end, which is arranged inside the U-shape; and the second connector is coupled to the second end, which is located inside the U-shape. [3] Electric machine according to claim 1 or 2, wherein the first connector and the second connector are arranged such that a gap between the first connector and the second connector in the circumferential direction is greater than or equal to the width of one of the teeth in the circumferential direction. [4] Electric machine according to claim 1 or 2, wherein the first connector and the second connector are arranged such that a gap between the first connector and the second connector in the circumferential direction is smaller than the width of one of the teeth in the circumferential direction. [5] Electric working machine according to one of claims 1 to 4, wherein the at least one magnet wire is a single magnet wire (35, 135). [6] Electric working machine according to any one of claims 1 to 4, wherein the at least one magnet wire is two or more, but a smaller number of magnet wires (235, 236) than the coils. [7] Electric working machine according to any one of claims 1 to 6, further comprising a rotary position sensor (62a) designed to detect a rotary position of the rotor, where the rotary position sensor is arranged on the stator core in the axial direction opposite to the conductive component. [8] Electric working machine according to any one of claims 1 to 7, wherein the first connector and the second connector overlap the stator core when viewed from the axial direction. [9] Electric working machine according to one of claims 1 to 8, wherein the conductive component electrically couples different two of the coils to each other. [10] Electric working machine according to any one of claims 1 to 9, wherein the coils comprise a multiple of three coils. [11] Electric machine according to claim 10, wherein: the rotor has eight magnetic poles; and the stator has six slots. [12] Electric working machine according to any one of claims 1 to 11, wherein the conductive component is in direct or indirect contact with the insulator. [13] Electric working machine according to one of claims 1 to 12, wherein the conductive component further comprises a power input (55U1, 55V1, 55W1, 155W1, 255U1, 255V1, 255W1, 355U1, 355V1, 355W1) which is configured to receive electrical power for the coils. [14] Electric working machine according to one of claims 1 to 13, further comprising a housing (90) which accommodates the brushless DC motor.

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