Stator, rotary electric machine and work machine

Abstract

To provide a stator capable of attaining improvement in assemblability, reduction in the number of components and downsizing, a rotary electric machine and a work machine.SOLUTION: A stator comprises a stator coil which is wound around a cylindrical stator core and includes a plurality of terminal side extension parts extending outward from a first end face of the stator core in an axial direction and disposed in a circumferential direction of the stator core. The plurality of terminal side extension parts includes a first extension part and a second extension part which are bent between a portion, to which a power line is connected, and the first end face, and are adjacent to each other in the circumferential direction. Bending positions of the first extension part and the second extension part are different from each other in the axial direction.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present disclosure relates to a stator, a rotating electrical machine, and a working machine.

Background Art

[0002] Conventionally, as a stator of a rotating electrical machine, a configuration including a stator coil wound around a cylindrical stator core and having a plurality of end-side extending portions that extend outward from a first end surface in the axial direction of the stator core and are arranged in the circumferential direction of the stator core is known (see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the configuration of Patent Document 1, depending on the position where the power line is connected and the position where the coil is bent, there is a risk of deterioration in assemblability, an increase in the number of parts, and an increase in size when connecting the power line.

[0005] An aspect of the present disclosure aims to provide a stator, a rotating electrical machine, and a working machine that can improve assemblability, reduce the number of parts, and miniaturize.

Means for Solving the Problems

[0006] A stator according to an aspect of the present disclosure includes a stator coil wound around a cylindrical stator core and having a plurality of end-side extending portions that extend outward from a first end surface in the axial direction of the stator core and are arranged in the circumferential direction of the stator core. The plurality of end-side extending portions include a first extending portion and a second extending portion that are bent between a portion to which a power line is connected and the first end surface and are adjacent to each other in the circumferential direction, and bending positions of each of the first extending portion and the second extending portion are different from each other in the axial direction.

Advantages of the Invention

[0007] According to an aspect of the present disclosure, it is possible to provide a stator, a rotating electrical machine, and a working machine that can improve assemblability, reduce the number of parts, and achieve miniaturization.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the present embodiment, as a rotating electrical machine, an example is described in which it is mounted on an electric swing excavator (an example of a working machine) and configured as a swing motor for swinging an upper swing body of the electric swing excavator.

[0010] In the following description, expressions indicating relative or absolute arrangements such as "parallel", "orthogonal", "center", "coaxial", etc. shall not only strictly mean such arrangements or states, but also include arrangements or states in which there are tolerances or relative displacements with angles or distances that can achieve the same function. In the drawings used in the following description, in order to make each member recognizable in size, the scale of each member may be appropriately changed and shown.

[0011] <Work machine> FIG. 1 is a schematic view showing a work machine according to an embodiment. The work machine 100 according to this embodiment is an electric hydraulic excavator. The work machine 100 may be a manned vehicle that operates by the driving operation of a driver, or an unmanned vehicle that operates unmanned.

[0012] The work machine 100 includes a traveling body 120, an upper swing body 140, and a work implement 160.

[0013] The traveling body 120 supports the work machine 100 so as to be capable of traveling. The traveling body 120 includes a traveling device 121. The traveling device 121 is, for example, a pair of left and right endless tracks. The traveling device 121 is driven by a traveling motor 122. The upper swing body 140 is supported by the traveling body 120 so as to be swingable about a swing axis. The upper swing body 140 performs a swing operation with respect to the traveling body 120 by a swing motor 114. The upper swing body 140 has a section 141 that houses a drive system.

[0014] The work implement 160 is supported by the upper swing body 140 so as to be operable. The work implement 160 is driven by hydraulic pressure. The work implement 160 includes a boom 161, an arm 162, and an attachment 163. The attachment 163 is an example of a working tool. The attachment 163 in the example shown in FIG. 1 is a bucket. In the example shown in FIG. 1, the side of the upper swing body 140 on which the work implement 160 is supported is the front, and the opposite side with respect to the front is the rear. In this embodiment, the left-right direction refers to the left and right with respect to the front, and the up-down direction refers to the direction in which the swing axis of the upper swing body 140 extends.

[0015] The slewing motor 114 is an electric motor (an example of a rotating electrical machine) driven by electric power. The slewing motor 114 slews the upper slewing body 140 with respect to the traveling body 120.

[0016] <Rotating electrical machine> FIG. 2 is a cross-sectional view of the rotating electrical machine 1 according to the embodiment.

[0017] In the present embodiment, the rotating electrical machine 1 is the slewing motor 114. The rotating electrical machine 1 includes a rotor 2, a stator 3, and a housing 4 that houses the rotor 2 and the stator 3. The rotating electrical machine 1 is an inner rotor type motor in which the stator 3 is disposed outside the cylindrical rotor 2. The rotating electrical machine 1 is vertically installed such that the rotor shaft 20 of the rotor 2 is parallel to the slewing axis.

[0018] In the present embodiment, the upper side corresponds to one side parallel to the central axis CL of the rotor shaft 20, and the lower side corresponds to the other side parallel to the central axis CL of the rotor shaft 20. Hereinafter, the direction along the central axis CL of the rotor shaft 20 is referred to as the "axial direction", the direction orthogonal to the axial direction is referred to as the "radial direction", and the direction of orbiting around the central axis CL of the rotor shaft 20 is referred to as the "circumferential direction".

[0019] The rotor 2 includes a rotor shaft 20, a rotor core 21, an upper plate 22, and a lower plate 23. The rotor shaft 20 is rotatably supported with respect to the housing 4 by bearings 21A and 21B.

[0020] The rotor core 21 is formed by laminating electromagnetic steel sheets in the axial direction, for example. The rotor core 21 is fitted to the rotor shaft 20. The rotor core 21 rotates integrally with the rotor shaft 20. A plurality of permanent magnets (not shown) are embedded in the rotor core 21.

[0021] Each of the upper plate 22 and the lower plate 23 is an annular plate member arranged coaxially with the rotor shaft 20. The upper plate 22 and the lower plate 23 are fitted to the rotor shaft 20. The upper plate 22 and the lower plate 23 sandwich the rotor core 21 from the outer side in the axial direction. The upper plate 22 and the lower plate 23 rotate integrally with the rotor shaft 20 and the rotor core 21.

[0022] The stator 3 is fixed to the inner surface of the housing 4 so as to cover the outer periphery of the rotor 2. The stator 3 includes a cylindrical stator core 30 and a stator coil 31. Similar to the rotor core 21, the stator core 30 is formed by laminating electromagnetic steel sheets in the axial direction. A plurality of teeth are provided on the inner peripheral side of the stator core 30 in the circumferential direction. The stator coil 31 is wound around the teeth.

[0023] The housing 4 houses the rotor 2 and the stator 3. The housing 4 includes a cylindrical cylindrical body 10, a ceiling portion 11 that closes the upper opening of the cylindrical body 10, and a bottom portion 13 that closes the lower opening of the cylindrical body 10. Due to the cylindrical body 10, the ceiling portion 11, and the bottom portion 13, a space 40 for housing the rotor 2 and the stator 3 is formed inside the housing 4.

[0024] <Stator> FIG. 3 is a perspective view of the stator 3 according to the embodiment. Referring to FIGS. 2 and 3 together, the stator 3 includes a cylindrical stator core 30 in which a plurality of slots 30s are formed side by side in the circumferential direction, and a stator coil 31 that is inserted into each of the plurality of slots 30s, wound around the stator core 30, and has a plurality of end-side extending portions 32e that extend outward from the first end surface 30f1 in the axial direction of the stator core 30 and are arranged in the circumferential direction.

[0025] On the inner peripheral side of the stator core 30, a plurality of slots 30s and a plurality of teeth 30t are arranged alternately over the entire circumference. The plurality of slots 30s are arranged at equal intervals in the circumferential direction of the stator core 30. For example, an insulating material may be provided in the slots 30s. Note that the form (arrangement, number, shape, etc.) of the slots 30s can be changed according to the design specifications.

[0026] In this embodiment, the stator coil 31 is composed of flat wires. The stator coil 31 is composed of a plurality of segment coils 39 having a U-shaped configuration with their ends connected to each other. The stator coil 31 is formed by winding a plurality of segment coils 39 with their ends connected to each other in a wave shape. For example, the segment coil 39 is a flat wire with an insulating coating covering the outer circumference of the wire. Note that the segment coil 39 is not limited to the above, and may include windings with a circular cross-section or an elliptical cross-section. The configuration form of the segment coil 39 can be changed according to the design specifications.

[0027] The stator coil 31 includes a first coil end 32 having a plurality of end-side extending portions 32e protruding from the first end face 30f1 in the axial direction of the stator core 30, and a second coil end 33 protruding from the second end face 30f2 on the side opposite to the first end face 30f1 of the stator core 30 in the axial direction. The axial direction of the stator core 30 corresponds to the direction along the central axis CL (see FIG. 2) of the rotor shaft 20. The first end face 30f1 of the stator core 30 corresponds to the upper end face of the stator core 30. The second end face 30f2 of the stator core 30 corresponds to the lower end face of the stator core 30. Note that in the stator core 30, the radial direction is the direction orthogonal to the axial direction, and the circumferential direction is the direction that circulates around the central axis CL.

[0028] In this embodiment, the first coil end 32 is disposed on the side (upper side) opposite to the bottom 13 of the housing 4 in the axial direction. On the other hand, the second coil end 33 is disposed on the same side (lower side) as the bottom 13 of the housing 4 in the axial direction. In this embodiment, the plurality of end-side extending portions 32e are disposed on the side (upper side) opposite to the bottom 13 of the housing 4 in the axial direction.

[0029] FIG. 4 is a perspective view of the inner peripheral portion of the stator 3 according to the embodiment. Referring to FIGS. 3 and 4 together, the stator 3 of this embodiment further includes power lines 35U, 35V, 35W connected to the plurality of end-side extending portions 32e. The plurality of end-side extending portions 32e include a connection extending portion 32j to which the power lines 35U, 35V, 35W are connected, and a non-connection extending portion 32u to which the power lines 35U, 35V, 35W are not connected. The power lines 35U, 35V, 35W include a twisted wire and a terminal connected to an end of the twisted wire. A connection member 38 for connecting the power lines 35U, 35V, 35W is connected to the connection extending portion 32j. The connection member 38 is connected to the terminals of the power lines 35U, 35V, 35W.

[0030] In this embodiment, the stator coil 31 includes three-phase winding groups 34U1, 34U2, 34V1, 34V2, 34W1, 34W2 connected in parallel to each other. The three-phase winding groups 34U1, 34U2, 34V1, 34V2, 34W1, 34W2 are U-phase, V-phase, and W-phase winding groups. The U-phase, V-phase, and W-phase winding groups 34U1, 34U2, 34V1, 34V2, 34W1, 34W2 are arranged in the circumferential direction of the stator core 30 such that two U-phases, two V-phases, two W-phases, ··· are arranged side by side.

[0031] <Bending positions of each of the first extending portion and the second extending portion> FIG. 5 is a perspective view showing distances D1, D2 from a reference position Pc to bending positions P1, P2 of each of the first extending portion 32j1 and the second extending portion 32j2 according to the embodiment. Referring to FIGS. 3 to 5 together, the plurality of end-side extending portions 32e are bent between the portion where the power lines 35U, 35V, 35W are connected and the first end surface 30f1 and include a first extending portion 32j1 and a second extending portion 32j2 that are adjacent to each other in the circumferential direction. In the example of the figure, the first extending portion 32j1 and the second extending portion 32j2 constitute the connecting extending portion 32j.

[0032] The bending positions P1 and P2 of each of the first extending portion 32j1 and the second extending portion 32j2 are different from each other in the axial direction. Note that the bending positions P1 and P2 mean positions where the power lines 35U, 35V, 35W are bent immediately before the portion where the power lines 35U, 35V, 35W are connected (excluding the position where it is bent closer to the first end surface 30f1) between the portion where the power lines 35U, 35V, 35W are connected and the first end surface 30f1.

[0033] In the present embodiment, the bending position P1 of the first extending portion 32j1 is arranged on the outer side (upper side) in the axial direction from the reference position Pc. The reference position Pc means a normal bending position (corresponding to the bending position of the end-side extending portion 32e in the non-connecting extending portion 32u). The bending position P2 of the second extending portion 32j2 is arranged on the inner side (lower side) in the axial direction from the reference position Pc.

[0034] In the present embodiment, the distances D1 and D2 from the reference position Pc of the bending positions P1 and P2 of each of the first extending portion 32j1 and the second extending portion 32j2 are the same as each other. The distances D1 and D2 from the reference position Pc of the bending positions P1 and P2 mean the intervals (lengths) between the reference position Pc and the bending positions P1 and P2 in the axial direction.

[0035] Note that, not limited to the above, the distance D1 from the reference position Pc of the bending position P1 of the first extending portion 32j1 may be set in the range from 1 / 2 times to 2 times the distance D2 from the reference position Pc of the bending position P2 of the second extending portion 32j2. The distances D1 and D2 from the reference position Pc of the bending positions P1 and P2 of each of the first extending portion 32j1 and the second extending portion 32j2 can be changed according to the design specifications.

[0036] In this embodiment, each of the first extending portion 32j1 and the second extending portion 32j2 includes an inclined portion 32s1 that obliquely intersects in the axial direction and the circumferential direction between the first end face 30f1 and the bending positions P1 and P2. The inclined portions 32s1 of each of the first extending portion 32j1 and the second extending portion 32j2 are arranged to be spaced apart from each other in the axial direction and the circumferential direction. A gap (space) intervenes over the entire direction along the inclination of the inclined portion 32s1 in the portion where the inclined portions 32s1 of the first extending portion 32j1 and the second extending portion 32j2 are separated.

[0037] In this embodiment, each of the first extending portion 32j1 and the second extending portion 32j2 includes a straight portion 32s2 that extends linearly along the axial direction between the portion to which the power lines 35U, 35V, and 35W are connected and the bending positions P1 and P2. The straight portions 32s2 of each of the first extending portion 32j1 and the second extending portion 32j2 are arranged to be adjacent to each other in the circumferential direction. The straight portions 32s2 of each of the first extending portion 32j1 and the second extending portion 32j2 are arranged such that the side surfaces facing each other in the circumferential direction are in contact or close to each other. Note that the bending positions P1 and P2 are provided at the boundary between the inclined portion 32s1 and the straight portion 32s2 (in other words, between the upper end of the inclined portion 32s1 and the lower end of the straight portion 32s2) in each of the first extending portion 32j1 and the second extending portion 32j2.

[0038] In this embodiment, the straight portions 32s2 of each of the first extending portion 32j1 and the second extending portion 32j2 are connected to the power lines 35U, 35V, and 35W at positions extending outward (upward) in the axial direction from positions adjacent to each other in the circumferential direction. When the side surfaces facing each other in the circumferential direction of the straight portions 32s2 of each of the first extending portion 32j1 and the second extending portion 32j2 are in contact, they are connected to the power lines 35U, 35V, and 35W at positions where the contact surface (side surface) is extended outward (upward) in the axial direction.

[0039] In the present embodiment, the stator 3 further includes a connection member 38 for connecting the power lines 35U, 35V, and 35W to each of the first extending portion 32j1 and the second extending portion 32j2. The connection member 38 includes a cylindrical tubular portion 38a to which the axially outer ends of each of the first extending portion 32j1 and the second extending portion 32j2 are connected, and an extending portion 38b extending from the tubular portion 38a and connected to the power lines 35U, 35V, and 35W.

[0040] Thereby, the axially outer ends of each of the first extending portion 32j1 and the second extending portion 32j2 can be collectively crimped and connected by the tubular portion 38a of the connection member 38. In the example of the figure, by a caulking joining method, the axially outer ends of the linear portions 32s2 of each of the first extending portion 32j1 and the second extending portion 32j2 are crimped inside the tubular portion 38a. Note that the axially outer ends of the linear portions 32s2 of each of the first extending portion 32j1 and the second extending portion 32j2 are not limited to the above, and may be welded. The connection mode of the axially outer ends of the linear portions 32s2 can be changed according to the design specifications.

[0041] The extending portion 38b extends axially outward (upward) from the tubular portion 38a. The connection between the extending portion 38b and the terminals of the power lines 35U, 35V, and 35W is made by fastening with bolts and nuts. A through hole through which a bolt passes is formed in the extending portion 38b. Note that the connection mode between the extending portion 38b and the terminals of the power lines 35U, 35V, and 35W is not limited to the above, and can be changed according to the design specifications.

[0042] In the present embodiment, a plurality of power lines 35U, 35V, and 35W are provided. A plurality of connection members 38 are provided corresponding to the plurality of power lines 35U, 35V, and 35W. Each of the plurality of connection members 38 is arranged at the same position in the axial direction. The connection positions of the extending portions 38b of each of the plurality of connection members 38 and the terminals of the power lines 35U, 35V, and 35W (for example, the center position of the hole through which a bolt passes in the extending portion 38b) are arranged at the same position in the axial direction.

[0043] In the example of the figure, the shape of each of the plurality of connecting members 38 is the same as each other. Note that the shape of each of the plurality of connecting members 38 is not limited to the above and may be different from each other. The shape of each of the plurality of connecting members 38 can be changed according to the design specifications.

[0044] <Function and Effect> As described above, the stator 3 of the present embodiment includes a stator coil 31 that is wound around a cylindrical stator core 30 and has a plurality of end-side extending portions 32e that extend outward from the first end face 30f1 in the axial direction of the stator core 30 and are arranged in the circumferential direction of the stator core 30. The plurality of end-side extending portions 32e include a first extending portion 32j1 and a second extending portion 32j2 that are bent between the portion to which the power lines 35U, 35V, 35W are connected and the first end face 30f1 and are adjacent to each other in the circumferential direction. The bending positions P1 and P2 of each of the first extending portion 32j1 and the second extending portion 32j2 are different from each other in the axial direction. For example, FIG. 6 shows a case where the bending positions of each of the plurality of end-side extending portions are the same as each other in the axial direction. In this case, since the plurality of end-side extending portions are separated from each other in the circumferential direction, it becomes difficult to connect to the power line. When the plurality of end-side extending portions are separated from each other in the circumferential direction, it is necessary to connect the coils (two end-side extending portions surrounded by the broken line in FIG. 6) to each other with other components (such as a bus bar) when connecting to the power line. Therefore, deterioration of assemblability, an increase in the number of parts, and an increase in size become problems. On the other hand, according to the present embodiment, since the bending positions P1 and P2 of each of the first extending portion 32j1 and the second extending portion 32j2 are different from each other in the axial direction, the coils (the first extending portion 32j1 and the second extending portion 32j2) can be brought closer to each other in the circumferential direction than in the comparative example of FIG. 6. Therefore, the first extending portion 32j1 and the second extending portion 32j2 that are brought closer can be connected to the power lines 35U, 35V, 35W, and there is no need to connect them with other components (such as a bus bar). Therefore, it is possible to improve assemblability, reduce the number of parts, and reduce the size.

[0045] In the present embodiment, the bending position P1 of the first extending portion 32j1 is arranged outside the reference position Pc in the axial direction. The bending position P2 of the second extending portion 32j2 is arranged inside the reference position Pc in the axial direction. For example, as a configuration for making the bending positions P1 and P2 of each of the first extending portion 32j1 and the second extending portion 32j2 different from each other in the axial direction, the bending position P1 of the first extending portion 32j1 is not changed and the bending position P2 of the second extending portion 32j2 is arranged inside in the axial direction relative to this position, or the bending position P2 of the second extending portion 32j2 is not changed and the bending position P1 of the first extending portion 32j1 is arranged outside in the axial direction relative to this position. However, in these configurations, it becomes difficult to cope with the case where the target positions for connecting the first extending portion 32j1 and the second extending portion 32j2 to the power lines 35U, 35V, and 35W are set at predetermined positions in the circumferential direction (for example, the central position between the non-connecting extending portions 32u adjacent in the circumferential direction to the first extending portion 32j1 and the second extending portion 32j2). On the other hand, according to this embodiment, since the bending positions P1 and P2 of each of the first extending portion 32j1 and the second extending portion 32j2 are arranged on the opposite side in the axial direction with respect to the reference position Pc, even when the target positions for connecting the first extending portion 32j1 and the second extending portion 32j2 to the power lines 35U, 35V, and 35W are set as described above, it is possible to easily cope with them.

[0046] In this embodiment, the distances D1 and D2 from the reference position Pc of the bending positions P1 and P2 of each of the first extending portion 32j1 and the second extending portion 32j2 are the same as each other. According to this embodiment, even when the target positions for connecting the first extending portion 32j1 and the second extending portion 32j2 to the power lines 35U, 35V, and 35W are set as described above, it is possible to more easily cope with them.

[0047] In this embodiment, each of the first extending portion 32j1 and the second extending portion 32j2 includes an inclined portion 32s1 that obliquely intersects in the axial direction and the circumferential direction between the first end surface 30f1 and the bending positions P1 and P2. The inclined portions 32s1 of each of the first extending portion 32j1 and the second extending portion 32j2 are arranged to be separated from each other in the axial direction and the circumferential direction. According to this embodiment, since dimensional errors and the like can be tolerated in the separated portions of the inclined portions 32s1 of each of the first extending portion 32j1 and the second extending portion 32j2, it contributes to improving the assemblability with respect to dimensional errors and the like.

[0048] In this embodiment, each of the first extending portion 32j1 and the second extending portion 32j2 includes a straight portion 32s2 that extends linearly along the axial direction between the portion to which the power lines 35U, 35V, and 35W are connected and the bending positions P1 and P2. The straight portions 32s2 of each of the first extending portion 32j1 and the second extending portion 32j2 are arranged adjacent to each other in the circumferential direction. According to this embodiment, since the straight portions 32s2 adjacent to each other in the circumferential direction can be connected to the power lines 35U, 35V, and 35W, it contributes to further improvement in assemblability, reduction in the number of parts, and miniaturization.

[0049] In this embodiment, the straight portions 32s2 of each of the first extending portion 32j1 and the second extending portion 32j2 are connected to the power lines 35U, 35V, and 35W at positions extending outward in the axial direction from positions adjacent to each other in the circumferential direction. For example, when connecting power lines to portions extending radially from a predetermined position, it is necessary to weld the portions extending radially or connect them with other components (such as bus bars and resin units). Therefore, the stator becomes larger in the radial direction, and there is a high possibility that the entire rotating electric machine including the housing becomes larger in the radial direction. On the other hand, according to this embodiment, since each straight portion 32s2 is connected to the power lines 35U, 35V, and 35W at positions extending outward in the axial direction from positions adjacent to each other in the circumferential direction, there is no need to connect with other components (such as bus bars and resin units). Therefore, it contributes to further improvement in assemblability, reduction in the number of parts, and miniaturization.

[0050] In this embodiment, the stator coil 31 is composed of flat wires. According to this embodiment, compared with the case where the stator coil 31 is composed of round wires, the stator coil 31 is easier to miniaturize, which contributes to further miniaturization. In addition, flat wires are harder than round wires and may need to be extended straight. Even in this case, since the straight flat wire can be connected to the power lines 35U, 35V, and 35W at the position extended outward in the axial direction as described above, the practical benefit is great.

[0051] In this embodiment, the stator 3 further includes a connection member 38 for connecting the power lines 35U, 35V, and 35W to each of the first extending portion 32j1 and the second extending portion 32j2. The connection member 38 includes a cylindrical tube portion 38a to which the axially outer end portions of each of the first extending portion 32j1 and the second extending portion 32j2 are connected, and an extending portion 38b that extends from the tube portion 38a and is connected to the power lines 35U, 35V, and 35W. According to this embodiment, the axially outer end portions of each of the first extending portion 32j1 and the second extending portion 32j2 are collectively crimped and connected by the tube portion 38a of the connection member 38, and the extending portion 38b extending from the tube portion 38a can be connected to the power lines 35U, 35V, and 35W, eliminating the need for connection with other components (such as bus bars). Therefore, it contributes to further improvement in assemblability, reduction in the number of parts, and miniaturization.

[0052] In this embodiment, a plurality of power lines 35U, 35V, and 35W are provided. A plurality of connection members 38 are provided corresponding to the plurality of power lines 35U, 35V, and 35W. Each of the plurality of connection members 38 is arranged at the same position in the axial direction. According to this embodiment, even when the target positions for connecting each of the plurality of connection members 38 to the power lines 35U, 35V, and 35W are set at predetermined positions in the axial direction (for example, the axial positions corresponding to each reference position Pc), it can be easily dealt with.

[0053] By the way, when the number of parallel flat angle lines is increased, other components (such as bus bars) for bundling at one location corresponding to the number of parallel lines are required, leading to problems such as deteriorated assemblability, increased number of parts, and increased size. Also, when connecting with other components (such as bus bars) at the outermost winding portion in the radial direction, the stator becomes larger in the radial direction, increasing the likelihood of the entire rotating electrical machine including the housing becoming larger in the radial direction. In contrast, in the present embodiment, the bending positions P1 and P2 of each of the first extending portion 32j1 and the second extending portion 32j2 are changed in the axial direction in the winding portion located at the innermost circumference of the stator 3. Therefore, the straight portions 32s2 of the flat angles adjacent to each other can be connected to the power lines 35U, 35V, and 35W, and the above problems do not occur. Accordingly, it contributes to further improvement in assemblability, reduction in the number of parts, and miniaturization.

[0054] <Modification Example> In the above-described embodiment, an example has been described in which the bending position of the first extending portion is arranged outside the reference position in the axial direction, and the bending position of the second extending portion is arranged inside the reference position in the axial direction, but the present invention is not limited to this. For example, as a configuration for making the bending positions of each of the first extending portion and the second extending portion different from each other in the axial direction, the bending position of the second extending portion may be arranged inside the axial direction with respect to the bending position of the first extending portion, or the bending position of the first extending portion may be arranged outside the axial direction with respect to the bending position of the second extending portion. The configuration for making the bending positions of each of the first extending portion and the second extending portion different from each other in the axial direction can be changed according to the design specifications.

[0055] In the above-described embodiment, an example has been described in which the distances from the reference position of the bending positions of each of the first extending portion and the second extending portion are the same as each other, but the present invention is not limited to this. For example, the distances from the reference position of the bending positions of each of the first extending portion and the second extending portion may be different from each other. The distances from the reference position of the bending positions of each of the first extending portion and the second extending portion can be changed according to the design specifications.

[0056] In the above-described embodiment, each of the first extending portion and the second extending portion includes an inclined portion that obliquely intersects in the axial direction and the circumferential direction between the first end surface and the bending position, and examples have been described in which the inclined portions of each of the first extending portion and the second extending portion are arranged so as to be separated from each other in the axial direction and the circumferential direction, but the present invention is not limited to this. For example, the inclined portions of each of the first extending portion and the second extending portion may be arranged so as to contact each other. The arrangement mode of the inclined portions of each of the first extending portion and the second extending portion can be changed according to the design specifications.

[0057] In the above-described embodiments, each of the first extending portion and the second extending portion includes a straight portion that extends linearly along the axial direction between the portion to which the power line is connected and the bending position, and the straight portions of each of the first extending portion and the second extending portion are arranged adjacent to each other in the circumferential direction. However, the present invention is not limited thereto. For example, the straight portions of each of the first extending portion and the second extending portion may be arranged to be spaced apart from each other in the circumferential direction. The arrangement mode of the straight portions of each of the first extending portion and the second extending portion can be changed according to the design specifications.

[0058] In the above-described embodiments, an example has been described in which the straight portions of each of the first extending portion and the second extending portion are connected to the power line at positions extending axially outward from positions adjacent to each other in the circumferential direction. However, the present invention is not limited thereto. For example, each of the first extending portion and the second extending portion may be connected to the power line at a portion extending radially from a predetermined position. The mode in which each of the first extending portion and the second extending portion is connected to the power line can be changed according to the design specifications.

[0059] In the above-described embodiments, the stator coil has been described by taking an example of being composed of flat wires. However, the present invention is not limited thereto. For example, the stator coil may be composed of round wires. The configuration mode of the stator coil can be changed according to the design specifications.

[0060] In the above-described embodiments, the stator further includes a connecting member for connecting the power line to each of the first extending portion and the second extending portion. The connecting member includes a cylindrical tube portion to which the outer axial ends of each of the first extending portion and the second extending portion are connected, and an extending portion extending from the tube portion and connected to the power line. However, the present invention is not limited thereto. For example, the outer axial ends of each of the first extending portion and the second extending portion may be connected to the power line by other components (such as busbars). For example, the stator may not include the above-described connecting member. The installation mode of the connecting member can be changed according to the design specifications.

[0061] In the above-described embodiments, examples were given in which a plurality of power lines are provided, a plurality of connection members are provided corresponding to the plurality of power lines, and each of the plurality of connection members is arranged at the same position as each other in the axial direction. However, the present invention is not limited to this. For example, each of the plurality of connection members may be arranged at different positions from each other in the axial direction. The arrangement mode of each of the plurality of connection members can be changed according to the design specifications.

[0062] In the above-described embodiments, examples were given in which the stator coil includes a three-phase winding group connected in parallel to each other. However, the present invention is not limited to this. For example, the stator coil may include a three-phase winding group connected in series to each other. The configuration mode of the winding group and the stator (relationship between poles, phases, slots, etc.) can be changed according to the design specifications.

[0063] In the above-described embodiments, examples were given in which the stator coil includes a plurality of U-shaped segment coils whose ends are connected to each other. However, the present invention is not limited to this. For example, the stator coil may include a coil continuously wound in a wave shape. The configuration mode of the stator coil can be changed according to the design specifications.

[0064] In the above-described embodiments, examples were given in which the rotating electrical machine includes a rotor, the above-described stator, and a housing that houses the rotor and the stator, and the plurality of end-side extending portions are arranged on the side opposite to the bottom of the housing in the axial direction. However, the present invention is not limited to this. For example, the plurality of end-side extending portions may be arranged on the same side as the bottom of the housing (opposite to the opening) in the axial direction. The arrangement mode of the plurality of end-side extending portions can be changed according to the design specifications.

[0065] In the above-described embodiment, the rotary electric machine is mounted on an electric swing shovel, and an example of an electric swing motor for swinging the upper swing body of the electric swing shovel has been described. However, the present invention is not limited to this. For example, the rotary electric machine may be mounted on other working machines such as a wheel loader, a bulldozer, or a dump truck. For example, the rotary electric machine may be configured as a drive motor for driving a working machine or a drive motor for driving a traveling device. The mode of the working machine on which the rotary electric machine is mounted and the object driven by the rotary electric machine can be changed according to the design specifications.

[0066] In the above-described embodiment, an example in which the rotary electric machine is vertically placed so that the rotor shaft is parallel to the swing axis has been described. However, the present invention is not limited to this. For example, the rotary electric machine may be horizontally placed so that the rotor shaft is orthogonal to the swing axis. For example, the rotary electric machine may be inclined and arranged so that the rotor shaft intersects obliquely with the swing axis. The arrangement mode of the rotary electric machine can be changed according to the design specifications.

[0067] In the above-described embodiment, an example in which the rotary electric machine is an inner rotor type rotary electric machine in which the stator is arranged outside the cylindrical rotor has been described. However, the present invention is not limited to this. For example, the rotary electric machine may be an outer rotor type rotary electric machine in which the stator is arranged inside the cup-shaped rotor. The type of the rotary electric machine can be changed according to the design specifications.

[0068] In the above-described embodiment, an example in which the rotary electric machine is a motor that drives the rotor to rotate by passing an alternating current through the stator coil has been described. However, the present invention is not limited to this. For example, the rotary electric machine may be a generator that generates electricity by rotating the rotor by power such as an engine. The mode of the rotary electric machine can be changed according to the design specifications.

[0069] As described above, one embodiment has been described with reference to the drawings. However, the specific configuration is not limited to the above, and additions, omissions, substitutions, and other changes can be made without departing from the spirit of the present disclosure. It is also possible to appropriately combine the above-described embodiments.

Description of Symbols

[0070] 1...Rotating electrical machine, 3...Stator, 30...Stator core, 30f1...First end face, 31...Stator coil, 32e...End-side extending portion, 32j1...First extending portion, 32j2...Second extending portion, 32s1...Inclined portion, 32s2...Straight portion, 35U, 35V, 35W...Power lines, 38...Connecting member, 38a...Cylindrical portion, 38b...Extending portion, 100...Machine tool, 114...Slewing motor, 120...Traveling body, 140...Upper slewing body, 160...Working machine, D1, D2...Distances, P1, P2...Bending positions, Pc...Reference position

Claims

1. A stator core includes a stator coil wound around a cylindrical stator core and having a plurality of end-side extending portions that extend outward from a first end surface in the axial direction of the stator core and are arranged in the circumferential direction of the stator core. The plurality of end-side extending portions include a first extending portion and a second extending portion that are bent between a portion to which a power line is connected and the first end surface and are adjacent to each other in the circumferential direction. Bending positions of each of the first extending portion and the second extending portion are different from each other in the axial direction. Stator.

2. The bending position of the first extending portion is arranged outside the axial direction with respect to a reference position. The bending position of the second extending portion is arranged inside the axial direction with respect to the reference position. The stator according to claim 1.

3. Distances from the reference position to the bending positions of each of the first extending portion and the second extending portion are the same as each other. The stator according to claim 2.

4. Each of the first extending portion and the second extending portion includes an inclined portion that obliquely intersects with respect to the axial direction and the circumferential direction between the first end surface and the bending position. The inclined portions of each of the first extending portion and the second extending portion are arranged to be separated from each other in the axial direction and the circumferential direction. The stator according to claim 1 or 2.

5. Each of the first extending portion and the second extending portion includes a straight portion that linearly extends along the axial direction between a portion to which the power line is connected and the bending position. The straight portions of each of the first extending portion and the second extending portion are arranged to be adjacent to each other in the circumferential direction. The stator according to claim 1 or 2.

6. The straight portions of each of the first extending portion and the second extending portion are connected to the power line at positions extended outward in the axial direction from positions adjacent to each other in the circumferential direction. The stator according to claim 5.

7. The stator coil is composed of a flat wire. The stator according to claim 1 or 2.

8. The stator further includes a connecting member for connecting the power line to each of the first extending portion and the second extending portion. The connecting member includes a cylindrical tubular portion to which outer end portions in the axial direction of each of the first extending portion and the second extending portion are connected, and an extending portion that extends from the tubular portion and is connected to the power line. The stator according to claim 1 or 2.

9. A plurality of the power lines are provided. A plurality of the connecting members are provided corresponding to the plurality of the power lines. Each of the plurality of the connection members is arranged at the same position as each other in the axial direction. The stator according to claim 8.

10. A rotor, The stator according to claim 1 or 2, A housing that houses the rotor and the stator, An electric rotating machine.

11. A traveling body, An upper slewing body that is rotatably supported about a slewing axis on the traveling body, A working machine that is operably supported on the upper slewing body, The rotating electric machine according to claim 10, configured as a slewing motor for slewing the upper slewing body with respect to the traveling body, A working machine comprising the same.

Images