Rotating electric machine and work machine

Abstract

This rotating electric machine comprises: a housing that accommodates a stator coil and has an opening formed therein; a power line that is connected to the stator coil and is drawn out through the opening; and an external terminal that is disposed in the housing and has a terminal block. The power line is drawn out, from the stator coil, toward one side in the axial direction of the rotating electric machine, and is connected to the stator coil and the terminal block so as to form a curved part. The curved part is positioned farther to the one side in the axial direction of the rotary electric machine than the terminal block.

Description

Rotating electric machines and work machines

[0001] This disclosure relates to a rotating electric machine and a work machine. This disclosure claims priority to Japanese Patent Application No. 2024-013355, filed on January 31, 2024, the contents of which are incorporated herein by reference.

[0002] Conventionally, a rotating electric machine is known that includes a housing that houses a rotor and a stator (see Patent Document 1). For example, an external terminal that connects to an external power source or the like is provided on a rear flange portion (case) of the rotating electric machine. A power line drawn from the housing is connected to the external terminal via a terminal block. In recent years, the electrification of work machines such as construction machines has progressed, and the replacement of hydraulic rotating machines with rotating electric machines has been considered. However, because rotating electric machines have a lower output per volume than hydraulic rotating machines, miniaturization is required to replace them with equivalent output. One measure considered for achieving miniaturization is to make the path of the power line connected by the terminal block more compact.

[0003] Republished WO2017 / 168971

[0004] However, depending on the bending radius, length, cross-sectional area, and distance to the terminal block of the power line, the external terminals are likely to be located higher, which may increase the thickness of the case and lead to an increase in the size of the rotating electrical machine.

[0005] An aspect of the present disclosure aims to provide a rotating electric machine and a working machine that can be made smaller.

[0006] A rotating electric machine according to one aspect of the present disclosure comprises a housing that accommodates a stator coil and has an opening formed therein, a power line connected to the stator coil and pulled out from the opening, and an external terminal arranged on the housing and having a terminal block, wherein the power line is pulled out from the stator coil to one side in the axial direction of the rotating electric machine and connected to the stator coil and the terminal block so as to form a curved portion, and the curved portion is located on one side in the axial direction of the rotating electric machine relative to the terminal block.

[0007] According to aspects of the present disclosure, it is possible to provide a rotating electric machine and a work machine that can be made smaller.

[0008] 1 is a schematic diagram showing a working machine according to an embodiment; FIG. 2 is a cross-sectional view of a rotating electric machine according to an embodiment; FIG. 3 is a perspective view of a stator according to an embodiment; FIG. 4 is a perspective view showing a power line connection structure according to an embodiment; FIG. 5 is a perspective view showing a portion where a power line is drawn out from an opening according to an embodiment; FIG. 6 is a perspective view showing a portion where a connecting member according to an embodiment is connected to a terminal block; FIG. 7 is a perspective view showing a state where a plurality of elastic members have been removed from an opening according to an embodiment; FIG. 8 is a perspective view of a connecting member according to an embodiment; FIG. 9 is a plan view of a plurality of elastic members according to an embodiment; FIG. 10 is a perspective view of a connecting member according to a comparative example; FIG. 11 is a schematic view showing a portion where a connecting member according to an embodiment is connected to a terminal block; FIG. 12 is a schematic view showing a portion where a connecting member according to a comparative example is connected to a terminal block;

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

[0010] In the following description, expressions indicating relative or absolute arrangements, such as "parallel," "orthogonal," "center," and "coaxial," do not only mean such arrangements or states in the strict sense, but also include arrangements or states in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained. In the drawings used in the following description, the scale of each component may be changed as appropriate to make each component recognizable.

[0011] <Construction machine> Figure 1 is a schematic diagram showing a construction machine according to an embodiment. The construction machine 100 according to this embodiment is an electric hydraulic excavator. The construction machine 100 may be a manned vehicle that is operated by a driver, or an unmanned vehicle that is operated without a driver.

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

[0013] The running body 120 supports the work machine 100 so that it can travel. The running body 120 is equipped with running devices 121. The running devices 121 are, for example, a pair of left and right caterpillars. The running devices 121 are driven by a traveling motor 122. The upper rotating body 140 is supported on the running body 120 so that it can rotate about a rotation axis. The upper rotating body 140 rotates relative to the running body 120 by the rotation motor 114. The upper rotating body 140 has a compartment 141 that houses a drive system.

[0014] The work implement 160 is operably supported on the upper rotating body 140. The work implement 160 is hydraulically driven. 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. In the example shown in FIG. 1, the attachment 163 is a bucket. In the example shown in FIG. 1, the side of the upper rotating 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 relative to the front, and the up-down direction refers to the direction in which the rotation axis of the upper rotating body 140 extends.

[0015] The swing motor 114 is an electric motor (an example of a rotating electric machine) that is driven by electricity. The swing motor 114 swings the upper swing body 140 relative to the traveling body 120.

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

[0017] In this embodiment, the rotating electric machine 1 is a swing motor 114. The rotating electric machine 1 includes a rotor 2, a stator 3, and a housing 4 that accommodates the rotor 2 and the stator 3. The rotating electric machine 1 is an inner rotor type motor in which the stator 3 is disposed outside the cylindrical rotor 2. The rotating electric machine 1 is placed vertically so that the rotor shaft 20 of the rotor 2 is parallel to the swing axis.

[0018] In this 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 will be referred to as the "axial direction," the direction perpendicular to the axial direction will be referred to as the "radial direction," and the direction going around the central axis CL of the rotor shaft 20 will be 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 relative to the housing 4 by bearings 21A and 21B.

[0020] The rotor core 21 is formed by, for example, laminating electromagnetic steel sheets in the axial direction. The rotor core 21 is fitted onto 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 annular plate members 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 outside 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. Like 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 circumferentially on the inner periphery of the stator core 30. The stator coil 31 is wound around the teeth.

[0023] The housing 4 accommodates the rotor 2 and the stator 3. The housing 4 includes a cylindrical body 10, a ceiling portion 11 that closes the upper opening of the cylinder 10, and a bottom portion 13 that closes the lower opening of the cylinder 10. The cylinder 10, the ceiling portion 11, and the bottom portion 13 form a space 40 inside the housing 4 for accommodating the rotor 2 and the stator 3.

[0024] 3 is a perspective view of the stator 3 according to the embodiment. Referring to both Fig. 2 and Fig. 3, the stator 3 includes a cylindrical stator core 30 having a plurality of slots 30s arranged in a circumferential direction, and a stator coil 31 inserted into each of the plurality of slots 30s and wound around the stator core 30, the stator coil 31 having a plurality of end-side extending portions 32e extending outward from a first axial end face 30f1 of the stator core 30 and arranged in a circumferential direction.

[0025] A plurality of slots 30s and a plurality of teeth 30t are arranged alternately around the inner periphery of the stator core 30. 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 inside the slots 30s. Note that the configuration of the slots 30s (such as their arrangement, number, and shape) can be changed according to design specifications.

[0026] In this embodiment, the stator coil 31 is made of rectangular wire. The stator coil 31 is made of a plurality of segment coils 39. For example, the segment coils 39 are rectangular wires with an insulating coating applied to the outer periphery of the wires. The segment coils 39 are not limited to the above, and may also be made up of windings with circular or elliptical cross sections. The configuration of the segment coils 39 can be changed according to the design specifications.

[0027] The stator coil 31 includes a first coil end 32 having a plurality of distal extensions 32e protruding from a first axial end face 30f1 of the stator core 30, and a second coil end 33 protruding from a second end face 30f2 of the stator core 30 opposite the first end face 30f1 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 the radial direction of the stator core 30 is a direction perpendicular to the axial direction, and the circumferential direction is a direction going around the central axis CL.

[0028] In this embodiment, the first coil end 32 is arranged on the opposite side (upper side) of the bottom 13 of the housing 4 in the axial direction. On the other hand, the second coil end 33 is arranged on the same side (lower side) of the bottom 13 of the housing 4 in the axial direction. In this embodiment, the multiple distal extensions 32e are arranged on the opposite side (upper side) of the bottom 13 of the housing 4 in the axial direction.

[0029] The stator 3 of this embodiment further includes a plurality of power lines 35U, 35V, and 35W connected to the plurality of distal extension portions 32e. The distal extension portions 32e include connection extension portions to which the power lines 35U, 35V, and 35W are connected and non-connection extension portions to which the power lines 35U, 35V, and 35W are not connected. The power lines 35U, 35V, and 35W include stranded wires and terminals connected to the ends of the stranded wires. A power line connection portion 36 for connecting the power lines 35U, 35V, and 35W is connected to the connection extension portions. The power line connection portion 36 is connected to the terminals of the power lines 35U, 35V, and 35W.

[0030] In this embodiment, the power line connection portion 36 and the terminals of the power lines 35U, 35V, and 35W are connected by fastening with bolts and nuts. The configurations of the power lines 35U, 35V, and 35W and the power line connection portion 36 are not limited to those described above and can be changed according to design specifications. For example, the power lines 35U, 35V, and 35W may include a bus bar, and the bus bar and the connection extension may be welded. For example, the power lines 35U, 35V, and 35W may include a stranded wire and a terminal connected to an end of the stranded wire, and the terminal and the connection extension may be welded. For example, the power lines 35U, 35V, and 35W may include a stranded wire and a first terminal connected to an end of the stranded wire, and a second terminal may be connected to the connection extension, and the first terminal and the second terminal may be welded to each other.

[0031] In this embodiment, the stator coil 31 includes three-phase winding groups 34U1, 34U2, 34V1, 34V2, 34W1, and 34W2 connected in parallel to one another. The three-phase winding groups 34U1, 34U2, 34V1, 34V2, 34W1, and 34W2 are winding groups for the U, V, and W phases. The U, V, and W-phase winding groups 34U1, 34U2, 34V1, 34V2, 34W1, and 34W2 are arranged two by two in the circumferential direction of the stator core 30, such as U phase, U phase, V phase, V phase, W phase, and so on.

[0032] In this embodiment, the stator coil 31 includes a plurality of U-shaped segment coils 39 whose ends are connected to one another. The stator coil 31 is formed by winding a plurality of segment coils 39 whose ends are connected to one another in a wave-like pattern. Note that, although the example shown in the figure shows segment coils 39 with a square cross section, segment coils 39 with a round cross section may also be used. The cross-sectional shape of the segment coils 39 is not limited to the above and can be changed according to design specifications.

[0033] In the example shown in the figure, when a plurality of segment coils 39 inserted circumferentially around the stator core 30 are considered to be one winding portion 34A, 34B, 34C, and 34D, four winding portions 34A, 34B, 34C, and 34D are arranged radially around the stator core 30. The four winding portions 34A, 34B, 34C, and 34D include a first winding portion 34A, a second winding portion 34B, a third winding portion 34C, and a fourth winding portion 34D. The first winding portion 34A, the second winding portion 34B, the third winding portion 34C, and the fourth winding portion 34D are arranged in this order from the innermost to the outermost circumference of the stator core 30.

[0034] <Power Line Connection Structure> FIG. 4 is a perspective view showing a connection structure for power lines 35U, 35V, and 35W according to the embodiment. FIG. 5 is a perspective view showing a portion where power lines 35U, 35V, and 35W are pulled out from an opening 4h according to the embodiment. FIG. 6 is a perspective view showing a portion where a connection member 60 according to the embodiment is connected to a terminal block 50. FIG. 7 is a perspective view showing a state where multiple elastic members 71 and 72 are removed from the opening 4h according to the embodiment. Referring to FIGS. 4 to 7 , the rotating electric machine 1 according to the present embodiment includes a housing 4 that accommodates a stator coil 31 and has an opening 4h formed therein, power lines 35U, 35V, and 35W connected to the stator coil 31 and pulled out from the opening 4h, and external terminals 51 that are disposed on the housing 4 and have a terminal block 50. The power lines 35U, 35V, and 35W are pulled out from the stator coil 31 to one axial side of the rotating electric machine 1 and connected to the stator coil 31 and the terminal block 50 so as to form a curved portion 35a. The curved portion 35 a is located on one side of the terminal block 50 in the axial direction of the rotating electric machine 1 .

[0035] The power lines 35U, 35V, and 35W include a connecting member 60 for connecting the power lines 35U, 35V, and 35W to the terminal block 50. The connecting member 60 connects the power lines 35U, 35V, and 35W drawn out from the opening 4h to the terminal block 50. The terminal block 50 is disposed with an axial difference H from one axial end position TP of the power lines 35U, 35V, and 35W. The one axial end position TP refers to the position of each of the multiple power lines 35U, 35V, and 35W that is closest to one side in the axial direction along the path extending from the opening 4h to the terminal block 50.

[0036] When viewed from the axial direction of the rotating electric machine 1, the opening 4h is formed in an arc shape that follows the circumferential direction of the rotating electric machine 1. The axial direction of the rotating electric machine 1 corresponds to the direction along the central axis CL (see FIG. 2 ) of the rotor shaft 20. The circumferential direction of the rotating electric machine 1 is the direction going around the central axis CL, and the radial direction is the direction perpendicular to the axial direction.

[0037] In the illustrated example, the lengths (total lengths) of the power lines 35U, 35V, and 35W are different from one another. However, the lengths of the power lines 35U, 35V, and 35W are not limited to the above and may be the same. The lengths of the power lines 35U, 35V, and 35W can be changed according to design specifications.

[0038] The housing 4 includes a case 9 that houses the power lines 35U, 35V, 35W, etc. that are drawn out from the opening 4h of the housing 4. The case 9 includes a peripheral wall portion 90 that stands upright from the upper surface of the ceiling portion 11 so as to surround the power lines 35U, 35V, 35W, etc. that are drawn out from the opening 4h of the housing 4, and a lid portion 97 (see FIG. 2) that closes the upper opening of the peripheral wall portion 90.

[0039] 4 , the peripheral wall portion 90 is formed in a pentagonal frame shape with rounded corners when viewed in the axial direction of the rotating electric machine 1. When viewed in the axial direction of the rotating electric machine 1, the peripheral wall portion 90 includes a first wall portion 91 and a second wall portion 92, each of which has one end connected to the other end of the first wall portion 91 and the second wall portion 92 to form an L-shape when combined, a third wall portion 93 and a fourth wall portion 94, each of which has one end connected to the other end of the first wall portion 91 and the other end of the second wall portion 92 and is arranged parallel to each other via power lines 35U, 35V, 35W, etc., and a fifth wall portion 95, which is connected to the other end of the third wall portion 93 and the fourth wall portion 94 and is arranged perpendicular to the wall portions 93 and 94. Note that the configuration (shape, components, etc.) of the peripheral wall portion 90 is not limited to the above and can be changed according to design specifications.

[0040] An upright wall portion 96 is provided inside the fourth wall portion 94 and stands up from the upper surface of the ceiling portion 11 so as to separate the space on the second wall portion 92 side from the space on the fifth wall portion 95 side. When viewed in the axial direction of the rotating electric machine 1, the upright wall portion 96 extends in a direction perpendicular to the direction in which the fourth wall portion 94 (excluding the rounded corners) extends.

[0041] The lid portion 97 is detachably attached to the peripheral wall portion 90. In this embodiment, the lid portion 97 and the peripheral wall portion 90 are connected to each other by fastening with a bolt and an internal thread portion. A plurality of internal thread portions are provided on the outer portion of the upper outer periphery of the peripheral wall portion 90. Note that the manner of connection between the lid portion 97 and the peripheral wall portion 90 is not limited to the above and can be changed according to design specifications.

[0042] Terminal block 50 is disposed with an axial difference H from one axial end position TP of power lines 35U, 35V, and 35W. Axial difference H refers to the axial difference between one axial end position TP of power lines 35U, 35V, and 35W and one surface of terminal block 50.

[0043] The terminal block 50 is disposed inside a portion of the fifth wall portion 95 of the peripheral wall portion 90 on the fourth wall portion 94 side. A plurality of terminal blocks 50 are provided corresponding to the plurality of power lines 35U, 35V, 35W. When viewed from the axial direction of the rotating electric machine 1, the plurality of terminal blocks 50 are disposed side by side in a direction perpendicular to the direction in which the fourth wall portion 94 (excluding the rounded corners) extends.

[0044] The power lines 35U, 35V, 35W drawn out from the opening 4h are connected to external terminals 51 by terminal blocks 50. The external terminals 51 are disposed on the outside of the portion of the fifth wall portion 95 of the peripheral wall portion 90 that faces the fourth wall portion 94. The terminal blocks 50 extend further inward from the portion of the external terminals 51 that protrudes inward from the fifth wall portion 95.

[0045] In the illustrated example, power line 35W, which has the shortest length among the multiple power lines 35U, 35V, and 35W, is drawn upward from a portion of the opening 4h on the second wall 92 side, then curves around the circumference, and then extends toward the terminal block 50 closest to the opening 4h among the multiple terminal blocks 50 (the terminal block 50 farthest from the fourth wall 94). One power line 35V of the remaining power lines 35U, 35V is drawn upward from a portion of the opening 4h on the third wall 93 side, then curves around the circumference, passes over power line 35W, and then extends toward the terminal block 50 second closest to the opening 4h among the multiple terminal blocks 50 (the terminal block 50 second farthest from the fourth wall 94). The remaining power line 35U is pulled upward from the boundary between the first wall portion 91 and the second wall portion 92 at the opening 4h, then extends while curving circumferentially, passing over the power line 35V, and then extends toward the terminal block 50 furthest from the opening 4h among the multiple terminal blocks 50 (the terminal block 50 closest to the fourth wall portion 94).

[0046] 8 is a perspective view of a connecting member 60 according to an embodiment. Referring also to FIG. 8, the connecting member 60 includes a cylindrical portion 61 to which the power lines 35U, 35V, and 35W drawn out from the opening 4h are connected, and an extension portion 62 that extends from the cylindrical portion 61 so as to intersect with the axial direction of the cylindrical portion 61 and is connected to the terminal block 50.

[0047] In the illustrated example, the cylindrical portion 61 is formed in a closed C-shape when viewed in the axial direction of the cylindrical portion 61. However, the shape of the cylindrical portion 61 is not limited to the above, and it may be an open C-shape or a cylindrical shape. The shape of the cylindrical portion 61 can be changed according to design specifications.

[0048] The extension portion 62 extends from a circumferential portion of the tubular portion 61 (a portion opposite the portion where the C-shaped tubular portion 61 closes) so as to intersect with the axial direction of the tubular portion 61. The extension portion 62 is formed by bending a portion of the tubular portion 61. The tubular portion 61 and the extension portion 62 are integrally formed from the same member. However, the tubular portion 61 and the extension portion 62 are not limited to the above, and may be integrally formed by joining different members together. The form of the tubular portion 61 and the extension portion 62 can be changed according to design specifications.

[0049] In this embodiment, the extension 62 and the terminal block 50 are connected by fastening a bolt to a female thread portion of the terminal block 50. The female thread portion is provided on the terminal block 50. A through hole through which the bolt passes is formed in the extension 62. Note that the manner of connection between the extension 62 and the terminal block 50 is not limited to the above and can be changed according to design specifications.

[0050] In this embodiment, when viewed from a direction perpendicular to the axis 61C of the tubular portion 61 and the line 62C along the extending portion 62, the angle A formed between the axis 61C of the tubular portion 61 and the line 62C along the extending portion 62 is greater than 0 degrees and not greater than 90 degrees. The angle A corresponds to the angle A of the direction in which the extending portion 62 is bent relative to the tubular portion 61. In the example shown in the figure, the angle A is approximately 60 degrees.

[0051] The angle A is not limited to the above and can be changed depending on the bending radius, length, and cross-sectional area of ​​the power lines 35U, 35V, and 35W, and the distance from the opening 4h to the terminal block 50. For example, the angle A may be 10 degrees or more and 80 degrees or less, 20 degrees or more and 70 degrees or less, or 30 degrees or more and 60 degrees or less.

[0052] 6 , in this embodiment, the power lines 35U, 35V, and 35W drawn out from the opening 4h curve and extend toward the other axial side of the rotating electric machine 1 just before the terminal block 50. The cylindrical portion 61 is connected to the ends of the curved power lines 35U, 35V, and 35W. The extending portion 62 extends from the cylindrical portion 61 obliquely intersecting the axial direction of the cylindrical portion 61 toward the terminal block 50. The extending portion 62 extends along the upper surface of the terminal block 50.

[0053] A plurality of connecting members 60 are provided corresponding to the plurality of power lines 35U, 35V, and 35W. In the example shown in the figure, the shapes of the plurality of connecting members 60 are the same. However, the shapes of the plurality of connecting members 60 are not limited to those described above and may be different from one another. The shapes of the plurality of connecting members 60 can be changed according to design specifications.

[0054] <Elastic Member> Fig. 9 is a plan view of multiple elastic members 71, 72 according to the embodiment. Referring also to Fig. 9, the rotating electric machine 1 further includes multiple elastic members 71, 72 each having a recess 71a, 72a formed along the outer periphery of the power lines 35U, 35V, 35W and arranged adjacent to each other in the radial direction so as to close the opening 4h. The multiple elastic members 71, 72 are attached to the opening 4h with the recess 71a, 72a facing each other via the power lines 35U, 35V, 35W.

[0055] 4 and 9 , in this embodiment, when viewed in the axial direction of the rotating electric machine 1, the opening 4h and each of the plurality of elastic members 71, 72 are formed in an arc shape along the circumferential direction of the rotating electric machine 1. Each of the plurality of elastic members 71, 72 is formed with a plurality of recesses 71a, 72a spaced apart in the circumferential direction.

[0056] In this embodiment, the combined shape of the opposing recesses 71 a, 72 a is elliptical when viewed in the axial direction of the rotating electric machine 1. Note that Fig. 9 shows gaps extending along the circumferential direction of the rotating electric machine 1 between the multiple elastic members 71, 72. When the multiple elastic members 71, 72 are attached to the opening 4 h, it is preferable that the recesses 71 a, 72 a of the multiple elastic members 71, 72 and the power lines 35U, 35V, 35W are closely attached to each other, and that the gaps are small in the portions of the multiple elastic members 71, 72 other than the recesses 71 a, 72 a.

[0057] 7 , before the multiple elastic members 71, 72 are attached to the opening 4h, the multiple power lines 35U, 35V, 35W are each drawn out from the opening 4h. The opening 4h has a groove 4m formed therein for attaching the multiple elastic members 71, 72. The groove 4m is formed in an arc shape along the circumferential direction of the rotating electric machine 1 so as to fit the combined shape of the multiple elastic members 71, 72.

[0058] For example, the procedure for attaching the multiple elastic members 71, 72 is as follows: First, one of the multiple elastic members 71, 72, the elastic member 71, is inserted into one side of the opening 4h (the radially inner side of the rotating electric machine 1 shown in FIG. 4 ). At this time, each recess 71a of the elastic member 71 is aligned with one side of the outer periphery of each of the power lines 35U, 35V, 35W.

[0059] Next, the other elastic member 72 (the remaining elastic member 72) of the multiple elastic members 71, 72 is inserted into the remaining side of the opening 4h (the radially inner side of the rotating electric machine 1 shown in FIG. 4 ). At this time, each recess 72a of the elastic member 72 is aligned with the remaining side of the outer periphery of each power line 35U, 35V, 35W.

[0060] The above procedure allows the multiple elastic members 71, 72 to be attached to the opening 4h. The procedure for attaching the multiple elastic members 71, 72 is not limited to the above, and may be performed in the reverse order, or the multiple elastic members 71, 72 may be attached at the same time. The procedure for attaching the multiple elastic members 71, 72 may be changed depending on the design specifications. After the multiple elastic members 71, 72 are attached to the opening 4h, a blocking member (not shown) may be provided on the upper surfaces of the multiple elastic members 71, 72 to block gaps between the multiple elastic members 71, 72.

[0061] 4 to 6 , in this embodiment, the rotating electric machine 1 further includes a holding member 81 that holds the power lines 35U, 35V, and 35W in the housing 4. The holding member 81 holds the curved portions 35a of the power lines 35U, 35V, and 35W. A plurality of holding members 81 are provided. Each of the plurality of holding members 81 is disposed closer to the terminal block 50 than the axial end position TP of each of the plurality of power lines 35U, 35V, and 35W. Each of the plurality of holding members 81 is disposed midway along the portion of each of the plurality of power lines 35U, 35V, and 35W that curves toward the other axial side of the rotating electric machine 1 between the axial end position TP and the terminal block 50. Each of the plurality of holding members 81 is formed in a ring shape surrounding the outer periphery of the power lines 35U, 35V, 35W and has a holding portion for holding the power lines 35U, 35V, 35W, and this holding portion is positioned at a position higher than the terminal block 50.

[0062] A plurality of holding members 81 are provided corresponding to the plurality of power lines 35U, 35V, and 35W. When viewed in the axial direction of the rotating electric machine 1, the plurality of holding members 81 are arranged side by side in a direction perpendicular to the direction in which the fourth wall portion 94 (excluding the rounded corners) extends (in other words, in a direction along the upper edge of the upright wall portion 96). For example, each of the plurality of holding members 81 is fixed to an upper portion of the upright wall portion 96. For example, the upper portion of the upright wall portion 96 may be provided with a plurality of engagement portions corresponding to each of the plurality of holding members 81.

[0063] In the illustrated example, the holding member 81 has an annular shape surrounding the outer periphery of the power lines 35U, 35V, and 35W, and includes a holding portion for holding the power lines 35U, 35V, and 35W, and a fixing portion connected to the holding portion for fixing the holding portion in a fixed position. In the illustrated example, the multiple holding members 81 have the same configuration. However, the configuration of each of the multiple holding members 81 is not limited to the above, and may be different from each other. The configuration of each of the multiple holding members 81 can be changed according to design specifications.

[0064] <Restraining Member> In the present embodiment, the rotating electric machine 1 further includes a restraining member 82 that is disposed between the opening 4h and the holding member 81 when viewed in the axial direction of the rotating electric machine 1. The restraining member 82 collectively restrains the multiple power lines 35U, 35V, 35W such that the multiple power lines 35U, 35V, 35W are disposed at a distance from each other relative to the cover portion 97 of the rotating electric machine 1.

[0065] The restraining member 82 is disposed closer to the opening 4h than the upright wall portion 96. In the example shown in the figure, the restraining member 82 has a ring shape that surrounds the plurality of power lines 35U, 35V, 35W and includes a restraining portion for restraining the power lines 35U, 35V, 35W. Note that the configuration of the restraining member 82 is not limited to the above and can be changed according to design specifications.

[0066] In the illustrated example, power lines 35U, 35V, and 35W drawn out from opening 4h extend in a curved manner so as to pass on one side of the axial direction of rotating electric machine 1 (the upper side inside case 9) just before restraining member 82. Generally, the bending radius of the stranded wire used for power lines 35U, 35V, and 35W needs to be several times (e.g., two to four times or more) the diameter of the stranded wire. Therefore, power lines 35U, 35V, and 35W need to make a large detour (extend in a curved manner) as shown in FIG. 5 , and pass on the upper side inside case 9.

[0067] From the viewpoint of improving the assembly accuracy when assembling the power lines 35U, 35V, and 35W and reducing the load on other components, it is preferable to memorize (treat) the bending shapes of the power lines 35U, 35V, and 35W before assembling the power lines 35U, 35V, and 35W. For example, it is preferable to memorize the shapes of the power lines 35U, 35V, and 35W before assembly, which will follow the paths of the power lines 35U, 35V, and 35W after assembly (for example, the shapes shown in FIGS. 4 to 6 ).

[0068] <Operation and Effect> As described above, the rotating electric machine 1 of this embodiment includes the housing 4 that accommodates the stator coil 31 and has the opening 4h formed therein, the power lines 35U, 35V, and 35W that are connected to the stator coil 31 and drawn out through the opening 4h, and the external terminals 51 that are disposed in the housing 4 and have the terminal block 50. The power lines 35U, 35V, and 35W are drawn out from the stator coil 31 to one side in the axial direction of the rotating electric machine 1 and connected to the stator coil 31 and the terminal block 50 so as to form the curved portion 35a. The curved portion 35a is located on one side in the axial direction of the rotating electric machine 1 relative to the terminal block 50. For example, if the power lines are extended straight toward the terminal block in accordance with the height of the curved radius in order to ensure the bending radius of the power lines drawn out through the opening, the position of the terminal block will likely be elevated, and the external terminals will also likely be elevated. The higher the position of the external terminals, the thicker the case will be, which may result in an increase in the size of the rotating electric machine. In contrast, according to this embodiment, the curved portions 35a of the power lines 35U, 35V, and 35W are positioned on one side of the terminal block 50 in the axial direction of the rotating electric machine 1, thereby ensuring the bending radius of the power lines 35U, 35V, and 35W drawn out from the opening 4h, and by arranging the terminal block 50 at a position lower than the height of this bending radius, it is possible to reduce the thickness of the case 9. Therefore, it is possible to provide a rotating electric machine 1 that can be made smaller.

[0069] In this embodiment, the power lines 35U, 35V, and 35W include a connecting member 60 for connecting the power lines 35U, 35V, and 35W to the terminal block 50. The connecting member 60 includes a cylindrical portion 61 to which the power lines 35U, 35V, and 35W extending from the opening 4h are connected, and an extending portion 62 extending from the cylindrical portion 61 so as to intersect the axial direction of the cylindrical portion 61 and connect to the terminal block 50. For example, there is a ring terminal (a connecting member according to a comparative example shown in FIG. 10 ) that includes an extending portion extending parallel to the axial direction of the cylindrical portion. FIG. 12 shows an example in which this connecting member according to the comparative example is connected to a terminal block. As shown in FIG. 12 , if the power lines are extended straight toward the terminal block to match the height of the bending radius in order to ensure the bending radius of the power lines extending from the opening, the position of the terminal block will likely be elevated, and the external terminals will also likely be elevated. Positioning the external terminals higher increases the thickness of the case, which may lead to an increase in the size of the rotating electric machine. In contrast, according to this embodiment, the extending portion 62 extends from the cylindrical portion 61 so as to intersect with the axial direction of the cylindrical portion 61 and is connected to the terminal block 50. This allows the extending portion 62 to be connected to the terminal block 50 at a position lower than the height of the bending radius while ensuring the bending radius of the power lines 35U, 35V, 35W drawn out from the opening 4h. Therefore, since the extending portion 62 is connected to the terminal block 50 at a lower position, the thickness of the case 9 can be reduced by the amount equivalent to that, as shown in FIG. 11 . Therefore, it is possible to provide a rotating electric machine 1 that can be made smaller.

[0070] In this embodiment, when viewed from a direction perpendicular to the axis 61C of the cylindrical portion 61 and the line 62C along the extending portion 62, the angle A formed between the axis 61C of the cylindrical portion 61 and the line 62C along the extending portion 62 is greater than 0 degrees and not greater than 90 degrees. According to this embodiment, the bending radius and the like of the power lines 35U, 35V, and 35W can be adjusted when the angle A is in the range of greater than 0 degrees and not greater than 90 degrees, which contributes to improving the degree of freedom in arranging the power lines 35U, 35V, and 35W.

[0071] In this embodiment, the power lines 35U, 35V, and 35W drawn out from the opening 4h curve and extend toward the other axial side of the rotating electric machine 1 just before the terminal block 50. The cylindrical portion 61 is connected to the ends of the curved power lines 35U, 35V, and 35W. The extending portion 62 extends from the cylindrical portion 61 obliquely intersecting the axial direction of the cylindrical portion 61 toward the terminal block 50. According to this embodiment, the ends of the power lines 35U, 35V, and 35W curve and extend toward the other axial side of the rotating electric machine 1 just before the terminal block 50 can be positioned low, and the extending portion 62 can be connected to the terminal block 50 at this low position. Therefore, it is not necessary to bend the power lines 35U, 35V, and 35W drawn out from the opening 4h multiple times in an S-shape. Furthermore, it is not necessary to ensure a large distance from the opening 4h to the terminal block 50. Therefore, it is possible to ensure the bending radius of the power lines 35U, 35V, and 35W, while reducing the distance from the opening 4h to the terminal block 50. This contributes to further miniaturization.

[0072] In this embodiment, the stator coil 31 is made of rectangular wire. This embodiment makes it easier to miniaturize the stator coil 31 compared to when the stator coil 31 is made of round wire, contributing to further miniaturization. Furthermore, rectangular wire is harder than round wire, so there are cases where it is desirable to extend the wire straight. Even in this case, the bending radius of the power lines 35U, 35V, and 35W connected to the ends of the straightened rectangular wire and drawn out from the opening 4h can be secured as described above, which is highly practical.

[0073] In this embodiment, the rotating electric machine 1 further includes multiple elastic members 71, 72, each having a recess 71a, 72a formed along the outer periphery of the power lines 35U, 35V, and 35W. The multiple elastic members 71, 72 are arranged adjacent to each other to close the opening 4h. The multiple elastic members 71, 72 are attached to the opening 4h with the recesses 71a, 72a facing each other across the power lines 35U, 35V, and 35W. For example, if a single elastic member with a hole is used, the power line must be passed through the hole from one side. In this case, the power line must be passed through the hole before connecting terminals or the like to the power line, which makes assembly difficult and limits the work order. In contrast, according to this embodiment, by including multiple elastic members 71, 72, each having a recess 71a, 72a formed therein, the elastic members 71, 72 can be attached to the opening 4h even after connecting terminals or the like to the power lines 35U, 35V, and 35W. This facilitates assembly and does not limit the work order. Additionally, each recess 71a, 72a is formed to fit along the outer periphery of the power lines 35U, 35V, and 35W, allowing the elastic members 71, 72 to retain their position while attached to the opening 4h. This contributes to vibration suppression of the power lines 35U, 35V, and 35W. Furthermore, compared to conventional grommets (specifically, elastic members with holes formed with larger diameters than the power lines), the gap can be made smaller, reducing the amount of oil that can flow in and leak. This also contributes to reducing temperature rise and oil-induced resin degradation.

[0074] In this embodiment, when viewed in the axial direction of the rotating electric machine 1, the opening 4h and each of the multiple elastic members 71, 72 are formed in an arc shape that follows the circumferential direction of the rotating electric machine 1. Each of the multiple elastic members 71, 72 has multiple recesses 71a, 72a formed at intervals in the circumferential direction. According to this embodiment, even when multiple power lines 35U, 35V, 35W are provided, each power line 35U, 35V, 35W can be held by each recess 71a, 72a formed in each of the multiple elastic members 71, 72. This contributes to suppressing vibration of each power line 35U, 35V, 35W.

[0075] In this embodiment, the combined shape of the opposing recesses 71a, 72a is elliptical when viewed in the axial direction of the rotating electric machine 1. According to this embodiment, the holding force of the power lines 35U, 35V, and 35W can be improved in the minor axis direction of the elliptical shape, and the ease of assembly in terms of dimensional errors and the like can be improved in the major axis direction of the elliptical shape. Furthermore, compared to when a conventional grommet is provided, the gap can be made smaller, thereby further reducing the amount of oil inflow and leakage.

[0076] In this embodiment, the rotating electric machine 1 further includes a holding member 81 that holds the power lines 35U, 35V, and 35W in the housing 4. The holding member 81 holds the curved portions 35a of the power lines 35U, 35V, and 35W. According to this embodiment, the holding member 81 can hold the power lines 35U, 35V, and 35W closer to the terminal block 50 than the axial end position TP. This contributes to further suppressing vibration of the power lines 35U, 35V, and 35W. In addition, the power lines 35U, 35V, and 35W can be held closer to the fastening portion between the connection member 60 and the terminal block 50, which contributes to preventing loosening of the fastening portion. In addition, the extension portions 62 can be connected to the terminal block 50 at the above-described low position while ensuring the bending radius of the power lines 35U, 35V, and 35W extending from the axial end position TP.

[0077] In this embodiment, a plurality of power lines 35U, 35V, and 35W are provided. The rotating electric machine 1 further includes a restraining member 82 disposed between the opening 4h and the holding member 81 as viewed in the axial direction of the rotating electric machine 1. The restraining member 82 collectively restrains the plurality of power lines 35U, 35V, and 35W so that each of the plurality of power lines 35U, 35V, and 35W is spaced apart from the lid portion 97 of the rotating electric machine 1. According to this embodiment, the restraining member 82 can restrain each of the plurality of power lines 35U, 35V, and 35W while keeping them spaced apart from the lid portion 97. This contributes to further suppressing vibration of each of the power lines 35U, 35V, and 35W. In addition, it is possible to prevent the power lines 35U, 35V, and 35W from coming into contact with the lid portion 97 and being damaged.

[0078] However, when using twisted wire and round terminals, which are commonly used as power lines, issues arise, such as an increase in volume due to limitations on the bending radius, resonance of the wire due to external vibrations, and loosening of the terminals. Because twisted wire has a lower limit on the bending radius depending on the cross-sectional area, thick twisted wires carrying large currents, such as those used in construction machinery, tend to require large detours in certain locations, raising concerns about an increase in volume and a reduction in the flexibility of routing. Furthermore, because rotating electrical machines in construction machinery are subject to greater external forces than those in automobiles, etc., there is a concern that the power lines may vibrate and resonate, causing loosening of the round terminals.

[0079] In contrast, in this embodiment, the extension portion 62 extends from the cylindrical portion 61 so as to intersect the axial direction of the cylindrical portion 61 and is connected to the terminal block 50, thereby suppressing an increase in volume while maintaining the lower limit of the bending radius of the stranded wire. Furthermore, the plurality of elastic members 71, 72, each having a recess 71 a, 72 a formed along the power lines 35U, 35V, 35W, are provided, thereby allowing the elastic members 71, 72 to have a holding force when attached to the opening 4 h. Therefore, even when a larger external force is applied to the rotating electric machine 1 than in an automobile, vibration and resonance of the power lines 35U, 35V, 35W can be suppressed, thereby suppressing the occurrence of loosening of the terminals, etc.

[0080] In the above-described embodiment, the power line includes a connecting member for connecting the power line to the terminal block, and the connecting member includes a cylindrical portion to which the power line drawn out from the opening is connected and an extending portion that extends from the cylindrical portion so as to intersect with the axial direction of the cylindrical portion and connect to the terminal block. However, this is not limited to this. For example, the connecting member may be a round terminal that includes an extending portion that extends from the cylindrical portion in a direction parallel to the axial direction of the cylindrical portion. The configuration of the connecting member can be changed according to design specifications.

[0081] In the above-described embodiment, an example has been described in which the angle formed between the axis of the cylindrical portion and the line along the extension portion when viewed from a direction perpendicular to each of the axis of the cylindrical portion and the line along the extension portion is greater than 0 degrees and less than 90 degrees, but this is not limited to this. For example, the angle formed between the axis of the cylindrical portion and the line along the extension portion when viewed from a direction perpendicular to each of the axis of the cylindrical portion and the line along the extension portion may be greater than 90 degrees. The angle formed between the axis of the cylindrical portion and the line along the extension portion when viewed from a direction perpendicular to each of the axis of the cylindrical portion and the line along the extension portion can be changed according to design specifications.

[0082] In the above-described embodiment, the power line drawn out from the opening is curved toward the other axial side of the rotating electric machine just before the terminal block, but this is not limiting. For example, the power line drawn out from the opening may be curved toward the other axial side of the rotating electric machine just behind the terminal block. The manner in which the power line extends can be changed according to the design specifications.

[0083] In the above-described embodiment, the cylindrical portion is connected to the end of the curved power line, but this is not limiting. For example, the cylindrical portion may be connected to a portion (midway) of the curved power line before the end. The connection mode of the cylindrical portion can be changed according to design specifications.

[0084] In the above-described embodiment, an example has been described in which the extension portion extends from the cylindrical portion obliquely across the axial direction of the cylindrical portion toward the terminal block, but this is not limited thereto. For example, the extension portion may extend from the cylindrical portion obliquely across the axial direction of the cylindrical portion toward a direction different from the terminal block. For example, the extension portion may extend toward a connecting member connected to the terminal block. For example, the extension portion may be directly connected to the terminal block, or may be indirectly connected via a connecting member or the like. The connection mode of the extension portion can be changed according to design specifications.

[0085] In the above-described embodiment, the stator coil is made of rectangular wire, but this is not limiting. For example, the stator coil may be made of round wire. The configuration of the stator coil can be changed according to the design specifications.

[0086] In the above-described embodiment, the rotating electric machine further includes a plurality of elastic members each having a recess formed along the outer periphery of the power line and arranged adjacent to each other to close the opening, and the plurality of elastic members are attached to the opening with the recesses facing each other across the power line. However, this is not limited to this. For example, the rotating electric machine may include a single elastic member having a hole formed therein. For example, the rotating electric machine may include a conventional grommet as the elastic member. The form of the elastic member may be changed depending on the design specifications.

[0087] In the above-described embodiment, an example has been described in which, when viewed from the axial direction of the rotating electric machine, the opening and each of the multiple elastic members are formed in an arc shape along the circumferential direction of the rotating electric machine, and each of the multiple elastic members has multiple recesses formed at intervals in the circumferential direction. However, this is not limited to this. For example, each of the multiple elastic members may be divided in the circumferential direction of the rotating electric machine. For example, multiple elastic members may be provided corresponding to each of the multiple power lines. For example, one elastic member may be provided for each power line of each phase. The installation mode of the elastic members may be changed according to design specifications.

[0088] In the above-described embodiment, the shape of the combination of the opposing recesses as viewed in the axial direction of the rotating electric machine is an ellipse, but this is not limited thereto. For example, the shape of the combination of the opposing recesses as viewed in the axial direction of the rotating electric machine may be an oval or a perfect circle. The shape of the combination of the opposing recesses as viewed in the axial direction of the rotating electric machine can be changed according to the design specifications.

[0089] In the above-described embodiment, the rotating electric machine further includes a holding member that holds the power line in the housing, and the holding member holds the curved portion of the power line. However, this is not limiting. For example, the holding member may hold a portion of the power line other than the curved portion. For example, the rotating electric machine may not include a holding member. The installation mode of the holding member can be changed depending on the design specifications.

[0090] In the above-described embodiment, an example has been described in which a plurality of power lines are provided, the rotating electric machine further includes a restraining member disposed between the opening and the holding member as viewed in the axial direction of the rotating electric machine, and the restraining member collectively restrains the plurality of power lines so that each of the plurality of power lines is spaced apart from the cover portion of the rotating electric machine. However, this is not limited to this. For example, the restraining member may collectively restrain the plurality of power lines so that each of the plurality of power lines is in contact with the cover portion of the rotating electric machine. For example, the rotating electric machine may not include the restraining member. The installation manner of the restraining member can be changed according to design specifications.

[0091] In the above-described embodiment, the stator coil has been described as having three-phase winding groups connected in parallel, but this is not limiting. For example, the stator coil may have three-phase winding groups connected in series. The winding groups and the configuration of the stator (e.g., the relationship between poles, phases, and slots) can be changed according to design specifications.

[0092] In the above-described embodiment, the stator coil is described as including a plurality of U-shaped segment coils whose ends are connected to each other, but this is not limiting. For example, the stator coil may include a coil wound in a continuous wave pattern. The configuration of the stator coil can be changed according to the design specifications.

[0093] In the above-described embodiment, the rotating electric machine includes a rotor, the stator, and a housing that accommodates the rotor and the stator, and the plurality of distal extensions are disposed on the axially opposite side of the housing from the bottom. However, this is not limiting. For example, the plurality of distal extensions may be disposed on the same axial side of the housing as the bottom (opposite the opening). The arrangement of the plurality of distal extensions can be changed according to design specifications.

[0094] In the above-described embodiment, the rotating electric machine is mounted on a hybrid excavator or an electric shovel, and an electric swing motor for swinging the upper swing body of the hybrid excavator or the electric shovel has been described as an example, but the present invention is not limited to this. For example, the rotating electric machine may be mounted on other work machines such as a wheel loader, a bulldozer, or a dump truck. For example, the rotating electric machine may be configured as a drive motor for driving a work machine or a drive motor for driving a traveling device. The type of work machine on which the rotating electric machine is mounted and the object that the rotating electric machine drives can be changed depending on the design specifications.

[0095] In the above-described embodiment, the rotating electric machine is described as being vertically disposed so that the rotor shaft is parallel to the rotation axis, but this is not limiting. For example, the rotating electric machine may be horizontally disposed so that the rotor shaft is perpendicular to the rotation axis. For example, the rotating electric machine may be disposed at an angle so that the rotor shaft intersects the rotation axis at an angle. The arrangement of the rotating electric machine can be changed according to the design specifications.

[0096] In the above-described embodiment, the rotating electric machine is an inner rotor type rotating electric machine in which a stator is disposed outside a cylindrical rotor, but the present invention is not limited to this. For example, the rotating electric machine may be an outer rotor type rotating electric machine in which a stator is disposed inside a cup-shaped rotor. The type of rotating electric machine can be changed depending on the design specifications.

[0097] In the above-described embodiment, the rotating electric machine is described as a motor that drives and rotates a rotor by passing an alternating current through a stator coil, but the present invention is not limited to this. For example, the rotating electric machine may be a generator that generates electricity by rotating a rotor using power from an engine or the like. The configuration of the rotating electric machine can be changed according to design specifications.

[0098] Although one embodiment has been described above with reference to the drawings, the specific configuration is not limited to that described above, and additions, omissions, substitutions, and other modifications to the configuration are possible within the scope of the present disclosure, and the above-described embodiments can also be combined as appropriate.

[0099] 1...rotating electric machine, 4...housing, 4h...opening, 31...stator coil, 35U, 35V, 35W...power line, 35a...curved portion, 50...terminal block, 60...connecting member, 61...tubular portion, 61C...axis, 62...extending portion, 62C...straight line, 71, 72...elastic member, 71a, 72a...recess, 81...holding member, 82...restraining member, 100...working machine, 114...swing motor, 120...traveling body, 140...upper swing body, 160...working machine, A...angle, H...axial difference, TP...axial one end position

Claims

1. A rotating electric machine comprising: a housing that accommodates a stator coil and has an opening formed therein; a power line connected to the stator coil and drawn out from the opening; and an external terminal disposed on the housing and having a terminal block, wherein the power line is drawn out from the stator coil to one side in the axial direction of the rotating electric machine and is connected to the stator coil and the terminal block so as to form a curved portion, and the curved portion is located on one side of the terminal block in the axial direction of the rotating electric machine.

2. A rotating electric machine as described in claim 1, wherein the power line includes a connecting member for connecting the power line to the terminal block, and the connecting member includes a cylindrical portion to which the power line drawn out from the opening is connected, and an extension portion that extends from the cylindrical portion so as to intersect with the axial direction of the cylindrical portion and is connected to the terminal block.

3. A rotating electric machine according to claim 2, wherein when viewed from a direction perpendicular to the axis of the cylindrical portion and the line along the extension portion, the angle formed by the axis of the cylindrical portion and the line along the extension portion is greater than 0 degrees and not greater than 90 degrees.

4. A rotating electric machine as described in claim 2 or 3, wherein the power line drawn out from the opening curves and extends toward the other axial side of the rotating electric machine just before the terminal block, the tubular portion is connected to the end of the curved and extending power line, and the extension portion extends from the tubular portion, intersecting obliquely with the axial direction of the tubular portion, toward the terminal block.

5. A rotating electric machine according to claim 1 or 2, wherein the stator coil is made of rectangular wire.

6. A rotating electric machine as claimed in claim 1 or 2, further comprising a plurality of elastic members each having a recess formed along the outer periphery of the power line and arranged adjacent to each other so as to close the opening, the plurality of elastic members being attached to the opening with the recesses facing each other across the power line.

7. A rotating electric machine according to claim 6, wherein, when viewed in the axial direction of the rotating electric machine, the opening and each of the plurality of elastic members are formed in an arc shape along the circumferential direction of the rotating electric machine, and each of the plurality of elastic members has a plurality of recesses formed therein at intervals in the circumferential direction.

8. The rotating electric machine according to claim 6, wherein the shape of the combination of the opposing recesses is elliptical when viewed in the axial direction of the rotating electric machine.

9. A rotating electric machine according to claim 1 or 2, further comprising a holding member that holds the power line in the housing, the holding member holding the curved portion of the power line.

10. A rotating electric machine as described in claim 9, wherein the power lines are provided in plurality, and further comprising a restraining member arranged between the opening and the retaining member when viewed in the axial direction of the rotating electric machine, the restraining member restraining the plurality of power lines together so that each of the plurality of power lines is arranged at a distance from the cover portion of the rotating electric machine.

11. A work machine comprising: a running body; an upper rotating body supported on the running body so as to be rotatable about a rotation axis; a work implement supported operably on the upper rotating body; and a rotating electric machine according to claim 1 or 2 configured as a rotation motor for rotating the upper rotating body relative to the running body.

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