Rotating electric machine and working machine

Abstract

The rotary electric motor includes: a housing that houses a stator coil and has an opening; a power line that is connected to the stator coil and leads out from the opening; and an external terminal disposed in the housing and having a terminal block. The power line leads out from the stator coil to one side of the axial direction of the rotary electric motor and is connected to the stator coil and the terminal block in a bent manner, the bent portion being located on the side of the axial direction of the rotary electric motor closer to the terminal block than the terminal block.

Description

Technical Field

[0001] This disclosure relates to rotating electrical machines and operating machinery.

[0002] This disclosure, dated January 31, 2024, asserts priority based on Japanese Patent Application No. 2024-013355 filed in Japan, the contents of which are incorporated herein by reference. Background Technology

[0003] Conventionally, rotating electric machines have been known to have a housing that houses the rotor and stator (see Patent Document 1). For example, an external terminal that communicates with an external power source is provided on the rear flange (housing) of the rotating electric machine. The power line leading from the housing is connected to the external terminal via a terminal block.

[0004] In recent years, the electrification of construction machinery and other operating machinery has been continuously developing, leading to research on the replacement of hydraulic rotary machines with rotary electric motors. However, the output per unit volume of a rotary electric motor is smaller than that of a hydraulic rotary machine, thus miniaturization is required to achieve the same output. As a countermeasure to achieve miniaturization, a method for making the path of the power line connected via a terminal block more compact has been studied.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Publication No. WO2017 / 168971 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] However, depending on the bending radius, length, cross-sectional area, and distance to the terminal block of the power line, the position of the external terminals is likely to be higher. If the position of the external terminals is higher, the thickness of the housing will increase, potentially leading to a larger rotary motor.

[0010] The purpose of this disclosure is to provide a miniaturized rotary electric motor and working machinery.

[0011] Methods for solving problems

[0012] One aspect of this disclosure of a rotary electric motor includes: a housing that houses a stator coil and has an opening; a power line connected to the stator coil and leading out from the opening; and an external terminal disposed in the housing and having a terminal block, wherein the power line leads out from the stator coil toward one side of the axial direction of the rotary electric motor and is connected to the stator coil and the terminal block in a manner forming a bend, the bend being located on one side of the axial direction of the rotary electric motor than the terminal block.

[0013] Invention Effects

[0014] According to the present disclosure, miniaturized rotary motors and operating machinery can be provided. Attached Figure Description

[0015] Figure 1 This is a schematic diagram showing the working machinery used in the implementation of the method.

[0016] Figure 2 This is a cross-sectional view of the rotary motor according to the embodiment.

[0017] Figure 3 This is a three-dimensional view of the stator in the implementation method.

[0018] Figure 4 This is a perspective view showing the connection structure of the power lines in the implementation method.

[0019] Figure 5 This is a perspective view showing the portion from which the power line is drawn out in the embodiment.

[0020] Figure 6 This is a perspective view showing the portion where the connecting member connects to the terminal block in the embodiment.

[0021] Figure 7 This is a perspective view showing the state in which multiple elastic members are removed from the opening in the embodiment.

[0022] Figure 8 This is a perspective view of the connecting components in the implementation method.

[0023] Figure 9 This is a top view of multiple elastic components in the implementation method.

[0024] Figure 10 This is a three-dimensional view of the connecting components of a comparative example.

[0025] Figure 11 This is a schematic diagram showing the portion where the connecting member is connected to the terminal block in the embodiment.

[0026] Figure 12 This is a schematic diagram showing the connection between the connecting member and the terminal block in a comparative example. Detailed Implementation

[0027] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In this embodiment, an example of a rotary motor will be described, which is mounted on a hybrid excavator or an electric excavator (an example of a work machine) and configured to rotate the upper rotating body of the hybrid excavator or electric excavator.

[0028] In the following description, terms such as "parallel," "orthogonal," "centered," and "coaxial," indicating relative or absolute configurations, not only strictly mean such configurations or states, but also include configurations or states with relative displacement by tolerances, angles, or distances to achieve the same function. In the accompanying drawings used in the following description, the scale of each component is sometimes appropriately altered to make them recognizable.

[0029] <Operating Machinery>

[0030] Figure 1 This is a schematic diagram illustrating the working machine of the embodiment. The working machine 100 in this embodiment is an electric hydraulic excavator. The working machine 100 can be a manned vehicle that operates through driver operation, or it can be an unmanned vehicle that operates without human intervention.

[0031] The operating machinery 100 includes a traveling body 120, an upper rotating body 140, and a working device 160.

[0032] The traveling body 120 supports the working machine 100 so that it can move. The traveling body 120 includes a traveling device 121. The traveling device 121 is, for example, a pair of left and right circular tracks. The traveling device 121 is driven by a traveling motor 122. The upper rotating body 140 is supported on the traveling body 120 in a manner that allows it to rotate about a rotation axis. The upper rotating body 140 rotates relative to the traveling body 120 via a rotation motor 114. The upper rotating body 140 has a partition 141 for accommodating the drive system.

[0033] The working device 160 is supported on the upper rotating body 140 in an operable manner. The working device 160 is hydraulically driven. The working device 160 includes a boom 161, a stick 162, and an accessory 163. The accessory 163 is an example of a working tool. Figure 1 In the example shown, accessory 163 is a bucket. Figure 1 In the example shown, one side of the supporting working device 160 in the upper rotating body 140 is the front, with the front as the reference, and the opposite side is the rear. In this embodiment, the left-right direction refers to 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.

[0034] The rotary motor 114 is an electric motor (an example of a rotary electric machine) driven by electricity. The rotary motor 114 causes the upper rotary body 140 to rotate relative to the traveling body 120.

[0035] Rotary Electric Machine

[0036] Figure 2 This is a cross-sectional view of the rotary motor 1 according to the embodiment.

[0037] In this embodiment, the rotary motor 1 is a rotary motor 114. The rotary motor 1 includes a rotor 2, a stator 3, and a housing 4 that houses the rotor 2 and the stator 3. The rotary motor 1 is an inner rotor type motor in which the stator 3 is disposed outside the cylindrical rotor 2. The rotary motor 1 is longitudinally arranged with the rotor shaft 20 of the rotor 2 parallel to the rotation axis.

[0038] In this embodiment, the upper side corresponds to the 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 orthogonal to the axial direction will be referred to as the "radial direction", and the direction around the central axis CL of the rotor shaft 20 will be referred to as the "circumferential direction".

[0039] 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 supported by bearings 21A and 21B and can rotate freely relative to the housing 4.

[0040] The rotor core 21 is constructed, for example, by stacking electromagnetic steel plates axially. The rotor core 21 is fitted into 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.

[0041] The upper plate 22 and the lower plate 23 are annular plate components coaxially arranged with the rotor shaft 20. The upper plate 22 and the lower plate 23 are fitted into the rotor shaft 20. The upper plate 22 and the lower plate 23 clamp the rotor core 21 from the outer side of the axial direction. The upper plate 22 and the lower plate 23 rotate integrally with the rotor shaft 20 and the rotor core 21.

[0042] The stator 3 is fixed to the inner surface of the housing 4 in a manner that covers the outer periphery of the rotor 2. The stator 3 includes a cylindrical stator core 30 and a stator coil 31. The stator core 30, like the rotor core 21, is constructed by stacking electromagnetic steel plates axially. On the inner periphery of the stator core 30, multiple teeth are provided on the circumference. The stator coil 31 is wound around the teeth.

[0043] The housing 4 houses the rotor 2 and the stator 3. The housing 4 has a cylindrical body 10, a top 11 that blocks the opening on the upper side of the cylindrical body 10, and a bottom 13 that blocks the opening on the lower side of the cylindrical body 10. Through the cylindrical body 10, the top 11, and the bottom 13, a space 40 for housing the rotor 2 and the stator 3 is formed inside the housing 4.

[0044] <Stator>

[0045] Figure 3 This is a perspective view of stator 3 in the implementation method.

[0046] Refer to together Figure 2 and Figure 3 The stator 3 has: a cylindrical stator core 30 having a plurality of slots 30s arranged circumferentially; and a stator coil 31 inserted into each of the slots 30s and wound around the stator core 30, and having a plurality of end-side extensions 32e extending outward from a first end face 30f1 of the stator core 30 in the axial direction and arranged circumferentially.

[0047] On the inner circumference of the stator core 30, multiple slots 30s and multiple teeth 30t are arranged alternately around the entire circumference. The multiple slots 30s are arranged at equal intervals in the circumferential direction of the stator core 30. For example, insulating material can also be placed in the slots 30s. It should be noted that the arrangement (configuration, quantity, shape, etc.) of the slots 30s can be changed according to design specifications.

[0048] In this embodiment, the stator coil 31 is composed of flat wire. The stator coil 31 is composed of multiple segmented coils 39. For example, the segmented coil 39 is a flat wire with an insulating film covering its outer periphery. It should be noted that the segmented coil 39 is not limited to the above, and may also be configured as a winding including a circular cross-section or an elliptical cross-section. The structural scheme of the segmented coil 39 can be changed according to the design specifications.

[0049] The stator coil 31 includes: a first coil end 32 having a plurality of end-side extensions 32e protruding axially from a first end face 30f1 of the stator core 30; and a second coil end 33 protruding axially from a second end face 30f2 of the stator core 30 on the side opposite to the first end face 30f1. The axial direction of the stator core 30 corresponds to the central axis CL along the rotor shaft 20 (see reference). Figure 2 The direction of 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. It should be noted that in the stator core 30, the radial direction is the direction orthogonal to the axial direction, and the circumferential direction is the direction around the central axis CL.

[0050] In this embodiment, the first coil end 32 is axially disposed on the side opposite to the bottom 13 of the housing 4 (upper side). On the other hand, the second coil end 33 is axially disposed on the same side as the bottom 13 of the housing 4 (lower side). In this embodiment, a plurality of end-side extensions 32e are axially disposed on the side opposite to the bottom 13 of the housing 4 (upper side).

[0051] The stator 3 in this embodiment also includes multiple power lines 35U, 35V, and 35W connected to multiple end-side extensions 32e. The multiple end-side extensions 32e include connecting extensions for connecting the power lines 35U, 35V, and 35W and non-connecting extensions for not connecting the power lines 35U, 35V, and 35W. The power lines 35U, 35V, and 35W have stranded wires and terminals connected to the ends of the stranded wires. Power line connecting portions 36 for connecting the power lines 35U, 35V, and 35W are connected to the connecting extensions. The power line connecting portions 36 are connected to the terminals of the power lines 35U, 35V, and 35W.

[0052] In this embodiment, the connection between the power line connector 36 and the terminals of the power lines 35U, 35V, and 35W is achieved through bolt and nut tightening. It should be noted that the structure of the power lines 35U, 35V, 35W, and the power line connector 36 is not limited to the above and can be modified according to design specifications. For example, the power lines 35U, 35V, and 35W may also include a busbar, which is welded to the connection extension. For example, the power lines 35U, 35V, and 35W may also include stranded wires and terminals connected to the ends of the stranded wires, with the terminals welded to the connection extension. For example, the power lines 35U, 35V, and 35W may also include stranded wires and a first terminal connected to the end of the stranded wires, with a second terminal connected to the connection extension, and the first and second terminals welded together.

[0053] In this embodiment, the stator coil 31 has three-phase winding groups 34U1, 34U2, 34V1, 34V2, 34W1, and 34W2 connected in parallel. The three-phase winding groups 34U1, 34U2, 34V1, 34V2, 34W1, and 34W2 are winding groups for phases U, V, and W, respectively. The winding groups 34U1, 34U2, 34V1, 34V2, 34W1, and 34W2 for phases U, V, and W are arranged in pairs around the stator core 30, with two of each of phases U, V, V, W, W, ...

[0054] In this embodiment, the stator coil 31 includes a plurality of U-shaped segmented coils 39 whose ends are interconnected. The stator coil 31 is formed by winding the plurality of segmented coils 39, whose ends are interconnected, into a wave shape. It should be noted that in the illustrated example, a segmented coil 39 with a square cross-section is shown, but it may also be a segmented coil 39 with a circular cross-section. The cross-sectional shape of the segmented coil 39 is not limited to the above and can be changed according to design specifications.

[0055] In the illustrated example, when multiple segmented coils 39 inserted circumferentially along the stator core 30 are designated as a single winding section 34A, 34B, 34C, 34D, four winding sections 34A, 34B, 34C, 34D are arranged radially along the stator core 30. The four winding sections 34A, 34B, 34C, 34D include a first winding section 34A, a second winding section 34B, a third winding section 34C, and a fourth winding section 34D. The first winding section 34A, the second winding section 34B, the third winding section 34C, and the fourth winding section 34D are arranged sequentially from the innermost circumference to the outermost circumference of the stator core 30.

[0056] <Connection Structure of Power Lines>

[0057] Figure 4 This is a perspective view showing the connection structure of the power lines 35U, 35V, and 35W in the embodiment. Figure 5 This is a perspective view showing the portion from which power lines 35U, 35V, and 35W are drawn out from the opening 4h in the embodiment. Figure 6 This is a perspective view showing the portion where the connecting member 60 is connected to the terminal block 50 in the embodiment. Figure 7 This is a perspective view showing the state in which multiple elastic members 71 and 72 are removed from the opening 4h in the embodiment.

[0058] Refer to together Figures 4 to 7 The rotary motor 1 of this embodiment includes: a housing 4 that houses a stator coil 31 and has an opening 4h; power lines 35U, 35V, and 35W that are connected to the stator coil 31 and led out from the opening 4h; and an external terminal 51 disposed in the housing 4 and having a terminal block 50. The power lines 35U, 35V, and 35W are led out from the stator coil 31 to one side of the axial direction of the rotary motor 1 and are connected to the stator coil 31 and the terminal block 50 in such a way as forming a bend 35a. The bend 35a is located on the side of the rotary motor 1 closer to the axial direction than the terminal block 50.

[0059] Power lines 35U, 35V, and 35W are equipped with connecting members 60 for connecting power lines 35U, 35V, and 35W to terminal block 50. Connecting members 60 connect power lines 35U, 35V, and 35W extending from opening 4h via terminal block 50. Terminal block 50 is configured to have an axial difference H relative to the axial end position TP of power lines 35U, 35V, and 35W. The axial end position TP refers to the position closest to the axial direction in the paths of the plurality of power lines 35U, 35V, and 35W extending from opening 4h to terminal block 50.

[0060] Viewed axially from the rotary motor 1, the opening 4h is formed in an arc shape along the circumference of the rotary motor 1. The axial direction of the rotary motor 1 corresponds to the central axis CL along the rotor shaft 20 (see reference). Figure 2 The direction of the rotary motor 1 is as follows. It should be noted that the circumferential direction is the direction around the central axis CL, and the radial direction is the direction orthogonal to the axial direction.

[0061] In the illustrated example, the lengths (total lengths) of the multiple power lines 35U, 35V, and 35W are all different. It should be noted that the lengths of the multiple power lines 35U, 35V, and 35W are not limited to those described above; they can also be the same. The lengths of the multiple power lines 35U, 35V, and 35W can be varied according to design specifications.

[0062] The housing 4 includes an outer shell 9 that houses the power lines 35U, 35V, 35W, etc., extending from the opening 4h. The outer shell 9 includes: a peripheral wall 90 that rises from the upper surface of the top 11 to surround the power lines 35U, 35V, 35W, etc., extending from the opening 4h of the housing 4; and a cover 97 (see reference). Figure 2 ), which blocks the upper opening of the peripheral wall 90.

[0063] Refer to together Figure 4 Viewed axially from the rotary motor 1, the peripheral wall portion 90 is formed as a pentagonal frame with rounded corners. Viewed axially from the rotary motor 1, the peripheral wall portion 90 includes: a first wall portion 91 and a second wall portion 92, each with one end connected to each other outside the opening 4h in an L-shape; a third wall portion 93 and a fourth wall portion 94, each with one end connected to the other end of the first wall portion 91 and the second wall portion 92, and 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 arranged orthogonally to each of the wall portions 93 and 94. It should be noted that the design (shape, constituent elements, etc.) of the peripheral wall portion 90 is not limited to the above and can be modified according to design specifications.

[0064] Inside the fourth wall portion 94, an upright wall portion 96 is provided, which stands upright from the upper surface of the top 11, in a manner that separates the space on the side of the second wall portion 92 and the space on the side of the fifth wall portion 95. Viewed from the axial direction of the rotary motor 1, the upright wall portion 96 extends in a direction orthogonal to the direction in which the fourth wall portion 94 (excluding the rounded corner portion) extends.

[0065] The cover 97 is detachably mounted to the peripheral wall portion 90. In this embodiment, the connection between the cover 97 and the peripheral wall portion 90 is achieved through fastening based on bolts and internal threads. Multiple internal threads are provided on the outer side of the upper outer periphery of the peripheral wall portion 90. It should be noted that the connection method between the cover 97 and the peripheral wall portion 90 is not limited to the above and can be modified according to design specifications.

[0066] Terminal block 50 is configured to have an axial difference H relative to one axial end position TP of power lines 35U, 35V, and 35W. The axial difference H refers to the difference in axial direction between one axial end position TP of power lines 35U, 35V, and 35W and one side of the terminal block 50.

[0067] Terminal blocks 50 are disposed on the inner side of the portion of the fifth wall 95 of the peripheral wall 90 on the side of the fourth wall 94. Multiple terminal blocks 50 are provided corresponding to multiple power lines 35U, 35V, and 35W. Viewed from the axial direction of the rotary motor 1, the multiple terminal blocks 50 are arranged in a direction orthogonal to the direction of extension of the fourth wall 94 (excluding the rounded corner portion).

[0068] Power lines 35U, 35V, and 35W, drawn from the opening 4h, are connected to external terminals 51 via terminal block 50. External terminals 51 are located on the outer side of the portion of the fifth wall 95 of the peripheral wall 90 positioned on the side of the fourth wall 94. Terminal block 50 extends further inward from the portion of external terminals 51 that protrudes into the fifth wall 95.

[0069] In the illustrated example, the shortest power line 35W among the multiple power lines 35U, 35V, and 35W is led upward from the part on the side of the second wall portion 92 at the opening 4h, bends and extends circumferentially, and then extends toward the terminal block 50 closest to the opening 4h (the terminal block 50 furthest from the fourth wall portion 94) among the multiple terminal blocks 50.

[0070] After the remaining power lines 35U and 35V are led upward from the part of the third wall 93 side at the opening 4h, the power line 35V bends and extends along the circumferential direction and passes through the power line 35W, and then extends toward the second terminal block 50 closest to the opening 4h (the second terminal block 50 farthest from the fourth wall 94) among the plurality of terminal blocks 50.

[0071] The remaining power line 35U is led upward from the portion of the opening 4h that is on the boundary side of the first wall portion 91 and the second wall portion 92, bends circumferentially and extends through the power line 35V, and then extends toward the terminal block 50 that is furthest from the opening 4h (the terminal block 50 closest to the fourth wall portion 94) among the plurality of terminal blocks 50.

[0072] <Connecting Components>

[0073] Figure 8 This is a perspective view of the connecting member 60 in the embodiment.

[0074] Refer to together Figure 8The connecting member 60 includes: a cylindrical portion 61, which is connected to power lines 35U, 35V, and 35W extending from the opening 4h; and an extension portion 62, which extends from the cylindrical portion 61 in a manner that intersects the axial direction of the cylindrical portion 61 and is connected to the terminal block 50.

[0075] In the illustrated example, viewed axially from the cylindrical portion 61, the cylindrical portion 61 is formed in a closed C-shape. It should be noted that the shape of the cylindrical portion 61 is not limited to the above; it can also be an open C-shape or a cylindrical shape. The shape of the cylindrical portion 61 can be changed according to design specifications.

[0076] The extension 62 extends from a circumferential portion of the cylindrical portion 61 (a portion on the side opposite to the closed portion of the C-shaped cylindrical portion 61) in a manner intersecting the axial direction of the cylindrical portion 61. The extension 62 is formed by bending relative to a portion of the cylindrical portion 61. The cylindrical portion 61 and the extension 62 are integrally formed from the same component. It should be noted that the cylindrical portion 61 and the extension 62 are not limited to the above description, and may also be integrally formed by combining different components. The forming method of the cylindrical portion 61 and the extension 62 can be varied according to design specifications.

[0077] In this embodiment, the extension 62 is connected to the terminal block 50 by fastening a bolt to the internal thread of the terminal block 50. The internal thread is provided in the terminal block 50. A through hole for the bolt to pass through is formed in the extension 62. It should be noted that the connection method between the extension 62 and the terminal block 50 is not limited to the above and can be changed according to design specifications.

[0078] In this embodiment, when viewed from a direction orthogonal to the axis 61C of the cylindrical portion 61 and the straight line 62C along the extension 62, the angle A formed by the axis 61C of the cylindrical portion 61 and the straight line 62C along the extension 62 is greater than 0 degrees and less than 90 degrees. Angle A corresponds to the angle A of the direction in which the extension 62 is bent relative to the cylindrical portion 61. In the illustrated example, angle A is approximately 60 degrees.

[0079] It should be noted that angle A is not limited to the above and can be varied according to the bending radius, length, cross-sectional area, and distance from the opening 4h to the terminal block 50 of the power lines 35U, 35V, and 35W. For example, angle A can 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.

[0080] Refer to together Figure 6In this embodiment, the power lines 35U, 35V, and 35W extending from the opening 4h extend in a curved manner toward the opposite side of the rotary motor 1 in front of the terminal block 50. The cylindrical portion 61 is connected to the ends of the curved power lines 35U, 35V, and 35W. The extension portion 62 crosses the cylindrical portion 61 obliquely relative to the axial direction of the cylindrical portion 61 and extends toward the terminal block 50. The extension portion 62 extends along the upper surface of the terminal block 50.

[0081] Multiple connecting members 60 are provided corresponding to multiple power lines 35U, 35V, and 35W. In the illustrated example, the shapes of the multiple connecting members 60 are all the same. It should be noted that the shapes of the multiple connecting members 60 are not limited to the above and may also be different from each other. The shapes of the multiple connecting members 60 can be changed according to design specifications.

[0082] <Elastic Components>

[0083] Figure 9 This is a top view of the multiple elastic members 71, 72 of the embodiment.

[0084] Refer to together Figure 9 The rotary motor 1 also includes a plurality of elastic members 71 and 72, each of which has a recess 71a and 72a formed along the outer periphery of the power lines 35U, 35V, and 35W, and is arranged radially adjacent to each other to block the opening 4h. The plurality of elastic members 71 and 72 are mounted in the opening 4h in a state where their respective recesses 71a and 72a are separated by the power lines 35U, 35V, and 35W.

[0085] Refer to together Figure 4 and Figure 9 In this embodiment, viewed from the axial direction of the rotary motor 1, the opening 4h and the plurality of elastic members 71 and 72 are respectively formed in an arc shape along the circumference of the rotary motor 1. A plurality of recesses 71a and 72a are formed at intervals along the circumference of the plurality of elastic members 71 and 72.

[0086] In this embodiment, viewed axially from the rotary motor 1, the shape formed by combining the opposing recesses 71a and 72a is elliptical. It should be noted that... Figure 9 The diagram shows a gap extending circumferentially between multiple elastic members 71, 72 along the rotary motor 1. With the multiple elastic members 71, 72 installed in the opening 4h, it is preferable that the recesses 71a, 72a of the multiple elastic members 71, 72 are in close contact with the power lines 35U, 35V, 35W, and that the portion of the multiple elastic members 71, 72 other than the recesses 71a, 72a reduces the aforementioned gap.

[0087] like Figure 7As shown, before the multiple elastic members 71 and 72 are installed in the opening 4h, multiple power lines 35U, 35V, and 35W are drawn out from the opening 4h. A groove 4m for installing the multiple elastic members 71 and 72 is formed in the opening 4h. The groove 4m is formed in an arc shape along the circumference of the rotary motor 1, in a manner that follows the shape formed by assembling the multiple elastic members 71 and 72.

[0088] For example, the installation sequence of multiple elastic components 71 and 72 shall be as follows.

[0089] First, one of the multiple elastic members 71 and 72, elastic member 71, is placed on one side of the opening 4h. Figure 4 (The radial inner side of the rotary motor 1 shown). At this time, each recess 71a of the elastic member 71 is aligned with one side of the outer periphery of each power line 35U, 35V, 35W.

[0090] Next, another elastic member 72 (the remaining elastic member 72) from among the multiple elastic members 71 and 72 is placed into the remaining side of the opening 4h. Figure 4 (The radial inner side of the rotary motor 1 shown). 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.

[0091] Through the above steps, multiple elastic components 71 and 72 can be installed in the opening 4h.

[0092] It should be noted that the installation sequence of the multiple elastic components 71 and 72 is not limited to the above. It can also be carried out in the reverse order, or the multiple elastic components 71 and 72 can be installed at the same time. The installation sequence of the multiple elastic components 71 and 72 can be changed according to the design specifications.

[0093] It should be noted that, after the multiple elastic members 71 and 72 are installed in the opening for 4 hours, a closing member (not shown) for blocking the gap between the multiple elastic members 71 and 72 can also be provided on the upper surface of the multiple elastic members 71 and 72.

[0094] <Retaining Components>

[0095] Refer to together Figures 4 to 6In this embodiment, the rotary motor 1 further includes a retaining member 81 that holds the power lines 35U, 35V, and 35W on the housing 4. The retaining member 81 holds the bent portions 35a of the power lines 35U, 35V, and 35W. Multiple retaining members 81 are provided. Each retaining member 81 is positioned closer to the terminal block 50 than one axial end position TP of each of the power lines 35U, 35V, and 35W. Each retaining member 81 is positioned midway along the bent portion of each of the power lines 35U, 35V, and 35W between one axial end position TP and the terminal block 50, facing the opposite axial direction of the rotary motor 1. Each retaining member 81 has a retaining portion that surrounds the outer periphery of the power lines 35U, 35V, and 35W and is positioned higher than the terminal block 50.

[0096] Multiple retaining members 81 are provided corresponding to multiple power lines 35U, 35V, and 35W. Viewed axially from the rotary motor 1, the multiple retaining members 81 are arranged in a direction orthogonal to the direction extending from the fourth wall portion 94 (excluding the rounded corner portion) (in other words, along the direction of the upper edge of the upright wall portion 96). For example, the multiple retaining members 81 are each fixed to the upper part of the upright wall portion 96. For example, multiple engaging portions may also be provided on the upper part of the upright wall portion 96 corresponding to each of the multiple retaining members 81.

[0097] In the illustrated example, the retaining member 81 includes: a retaining portion, which is annular around the periphery of the power lines 35U, 35V, and 35W, for retaining the power lines 35U, 35V, and 35W; and a fixing portion, which is connected to the retaining portion and for fixing the retaining portion in a fixed position. In the illustrated example, the structures of the multiple retaining members 81 are identical to each other. It should be noted that the structures of the multiple retaining members 81 are not limited to the above and may also be different from each other. The structural configuration of the multiple retaining members 81 can be changed according to design specifications.

[0098] <Constraint Components>

[0099] In this embodiment, the rotary motor 1 further includes a constraint member 82 disposed between the opening 4h and the retaining member 81 when viewed from the axial direction of the rotary motor 1. The constraint member 82 constrains the plurality of power lines 35U, 35V, and 35W together in such a manner that the plurality of power lines 35U, 35V, and 35W are respectively disposed separately relative to the cover 97 of the rotary motor 1.

[0100] The restraining member 82 is positioned 4h closer to the opening than the raised wall portion 96. In the illustrated example, the restraining member 82 has a restraining portion that is a ring surrounding multiple power lines 35U, 35V, and 35W, used to restrain the power lines 35U, 35V, and 35W. It should be noted that the structure of the restraining member 82 is not limited to the above and can be modified according to design specifications.

[0101] In the illustrated example, the power lines 35U, 35V, and 35W extending from the opening 4h extend in a curved manner in front of the constraint member 82, passing through one side of the axial direction of the rotary motor 1 (the upper side inside the housing 9). Typically, the bending radius of the stranded wire used for the power lines 35U, 35V, and 35W needs to be several times (e.g., more than 2 to 4 times) the diameter of the stranded wire. Therefore, the power lines 35U, 35V, and 35W need to be as follows: Figure 5 It rotates so much (extends in a curved manner) through the upper side inside the outer casing 9.

[0102] It should be noted that, from the viewpoint of improving assembly accuracy and reducing the load on other components during the assembly of power lines 35U, 35V, and 35W, it is preferable to pre-store (assign a shape) the bending shape of power lines 35U, 35V, and 35W before assembly. For example, for power lines 35U, 35V, and 35W before assembly, the shape along the path of power lines 35U, 35V, and 35W after assembly is pre-stored (e.g., Figures 4 to 6 (The shape shown is sufficient.)

[0103] <Effects>

[0104] As described above, the rotary motor 1 of this embodiment includes: a housing 4 that houses the stator coil 31 and has an opening 4h; power lines 35U, 35V, and 35W that are connected to the stator coil 31 and led out from the opening 4h; and an external terminal 51 disposed in the housing 4 and having a terminal block 50. The power lines 35U, 35V, and 35W are led out from the stator coil 31 to one side of the axial direction of the rotary motor 1 and are connected to the stator coil 31 and the terminal block 50 in such a way as forming a bend 35a. The bend 35a is located on the side of the rotary motor 1 closer to the axial direction than the terminal block 50.

[0105] For example, if the power line extending straight toward the terminal block is made to ensure the bending radius of the power line leading out from the opening, and the height of that bending radius corresponds to the height of the power line, then the position of the terminal block will be higher, and the position of the external terminals will also be higher. If the position of the external terminals is higher, the thickness of the housing will increase, which may lead to a larger rotary motor.

[0106] In contrast, according to this embodiment, by positioning the bends 35a of the power lines 35U, 35V, and 35W on a side closer to the axial direction of the rotary motor 1 than the terminal block 50, the bending radii of the power lines 35U, 35V, and 35W extending from the opening 4h can be ensured. Furthermore, by arranging the terminal block 50 at a height lower than this bending radius, the thickness of the housing 9 can be reduced. Therefore, a rotary motor 1 capable of being miniaturized can be provided.

[0107] In this embodiment, the power lines 35U, 35V, and 35W are provided with connecting members 60 for connecting the power lines 35U, 35V, and 35W to the terminal block 50. The connecting member 60 includes: a cylindrical portion 61, which is connected to the power lines 35U, 35V, and 35W extending from the opening 4h; and an extension portion 62, which extends from the cylindrical portion 61 in a manner that intersects the axial direction of the cylindrical portion 61 and is connected to the terminal block 50.

[0108] For example, there is a circular terminal having an extension that extends axially parallel to the cylindrical portion. Figure 10 (The connecting member of the comparative example shown). Figure 12 This indicates the case where the connecting member of the comparative example is connected via a terminal block. For example... Figure 12 As shown, if the power line extends straight toward the terminal block in order to ensure the bending radius of the power line leading out from the opening, and the height of that bending radius corresponds to the height of the power line, then the position of the terminal block will be higher, and the position of the external terminals will also be higher. If the position of the external terminals is higher, the thickness of the housing will increase, which may lead to a larger rotary motor.

[0109] In contrast, according to this embodiment, by providing an extension 62 that extends from the cylindrical portion 61 in a manner intersecting the axial direction of the cylindrical portion 61 and connects to the terminal block 50, the bending radius of the power lines 35U, 35V, and 35W drawn from the opening 4h can be ensured, and the extension 62 can be connected to the terminal block 50 at a height lower than this bending radius. Therefore, as Figure 11 As shown, the thickness of the housing 9 can be reduced by connecting the extension 62 to the terminal block 50 at a lower position. Therefore, a miniaturized rotary motor 1 can be provided.

[0110] In this embodiment, when viewed from a direction orthogonal to the axis 61C of the cylinder 61 and the straight line 62C along the extension 62, the angle A formed by the axis 61C of the cylinder 61 and the straight line 62C along the extension 62 is greater than 0 degrees and less than 90 degrees.

[0111] According to this embodiment, the bending radius of the power lines 35U, 35V, and 35W can be adjusted within a range where angle A exceeds 0 degrees and is less than 90 degrees, thus contributing to the improvement of the configuration freedom of the power lines 35U, 35V, and 35W.

[0112] In this embodiment, the power lines 35U, 35V, and 35W extending from the opening 4h extend in a curved manner toward the terminal block 50 on the opposite side of the axial direction of the rotary motor 1. The cylindrical portion 61 is connected to the ends of the curved power lines 35U, 35V, and 35W. The extension portion 62 crosses the cylindrical portion 61 obliquely relative to the axial direction of the cylindrical portion 61 and extends toward the terminal block 50.

[0113] According to this embodiment, the ends of the power lines 35U, 35V, and 35W, which extend in a curved manner towards the opposite side of the rotary motor 1 in front of the terminal block 50, can be positioned at a lower location, and the extension portion 62 can be connected to the terminal block 50 at this lower position. Therefore, it is not necessary for the power lines 35U, 35V, and 35W extending from the opening 4h to bend 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, the bending radius of the power lines 35U, 35V, and 35W can be ensured, and the distance from the opening 4h to the terminal block 50 can be kept small. This contributes to further miniaturization.

[0114] In this embodiment, the stator coil 31 is made of flat wire.

[0115] According to this embodiment, compared to the case where the stator coil 31 is made of round wire, it is easier to miniaturize the stator coil 31, thus contributing to further miniaturization. Furthermore, flat wire is stiffer than round wire, and sometimes it is desirable to extend it straight. In this case, the bending radius of the power lines 35U, 35V, and 35W, which connect to the ends of the straight-extending flat wire and are led out from the opening 4h, can be ensured as described above, thus providing significant practical benefits.

[0116] In this embodiment, the rotary motor 1 further includes a plurality of elastic members 71 and 72, each of which has a recess 71a and 72a formed along the outer periphery of the power lines 35U, 35V, and 35W, and is arranged adjacent to each other in a manner that blocks the opening 4h. The plurality of elastic members 71 and 72 are mounted in the opening 4h in a state where their respective recesses 71a and 72a are separated by the power lines 35U, 35V, and 35W.

[0117] For example, in the case of a single elastic member with a hole, the power line needs to pass through from the direction of the hole's opening. In this case, the power line needs to be passed through the hole before connecting terminals, etc., making assembly difficult and restricting the work sequence.

[0118] In contrast, according to this embodiment, by providing multiple elastic members 71 and 72 each having recesses 71a and 72a, even after connecting terminals or the like to the power lines 35U, 35V, and 35W, each elastic member 71 and 72 can be installed in the opening 4h. Therefore, assembly is easy, and the order of operations is not limited. Furthermore, since each recess 71a and 72a is formed along the outer periphery of the power lines 35U, 35V, and 35W, it provides holding force when each elastic member 71 and 72 is installed in the opening 4h. Therefore, it helps to suppress vibration of the power lines 35U, 35V, and 35W. Moreover, compared to the conventional case of having a cable sheath (specifically, an elastic member with a hole larger than the diameter of the power line), the gap can be reduced, thus reducing oil inflow and leakage. Therefore, it is also expected to reduce temperature rise and reduce resin degradation caused by oil.

[0119] In this embodiment, viewed from the axial direction of the rotary motor 1, the opening 4h and the plurality of elastic members 71, 72 are each formed in an arc shape along the circumference of the rotary motor 1. A plurality of recesses 71a, 72a are formed at intervals along the circumference of the plurality of elastic members 71, 72.

[0120] According to this embodiment, even when multiple power lines 35U, 35V, and 35W are provided, each power line 35U, 35V, and 35W can be held in place by utilizing the recesses 71a and 72a formed on the multiple elastic members 71 and 72, respectively. Therefore, it helps to suppress the vibration of each power line 35U, 35V, and 35W.

[0121] In this embodiment, when viewed from the axial direction of the rotary motor 1, the shape formed by combining the opposing recesses 71a and 72a is an elliptical shape.

[0122] According to this embodiment, the holding force of the power lines 35U, 35V, and 35W can be improved in the short axis direction of the elliptical shape, and the assemblability relative to dimensional errors can be improved in the long axis direction of the elliptical shape. Moreover, compared with the conventional case of having a cable sheath, the gap can be further reduced, thereby further reducing the amount of oil flowing in and leaking.

[0123] In this embodiment, the rotary motor 1 further includes a retaining member 81 that holds the power lines 35U, 35V, and 35W on the housing 4. The retaining member 81 holds the bent portion 35a of the power lines 35U, 35V, and 35W.

[0124] According to this embodiment, the power lines 35U, 35V, and 35W can be held closer to the terminal block 50 than the axial end position TP by the holding member 81. Therefore, it helps to suppress further vibration of the power lines 35U, 35V, and 35W. Furthermore, since they can be held near the fastening portion of the connecting member 60 and the terminal block 50, it helps to prevent loosening of the fastening portion. In addition, the bending radius of the power lines 35U, 35V, and 35W extending from the axial end position TP can be ensured, and the extension portion 62 is connected to the terminal block 50 at the aforementioned low position.

[0125] In this embodiment, multiple power lines 35U, 35V, and 35W are provided. The rotary motor 1 also includes a constraint member 82 disposed between the opening 4h and the retaining member 81 when viewed from the axial direction of the rotary motor 1. The constraint member 82 constrains the multiple power lines 35U, 35V, and 35W together in such a way that the multiple power lines 35U, 35V, and 35W are respectively disposed separately from the cover 97 of the rotary motor 1.

[0126] According to this embodiment, the multiple power lines 35U, 35V, and 35W can be constrained in a state separated from the cover portion 97 by the constraint member 82. Therefore, it helps to further suppress the vibration of each power line 35U, 35V, and 35W. In addition, it can prevent damage to each power line 35U, 35V, and 35W from contact with the cover portion 97.

[0127] However, when using stranded wire and round terminals, which are commonly used as power lines, issues arise such as increased volume due to the limitation of the bending radius, wire resonance caused by external vibration, and terminal loosening. Since stranded wire has a lower limit on the bending radius corresponding to its cross-sectional area, in the case of thick stranded wires carrying large currents, such as in construction machinery, the path becomes a section with large turns, raising concerns about increased volume and reduced freedom of path selection. Furthermore, in construction machinery, the external force applied to the rotating motor is greater than in automobiles, so vibration and resonance of the power line may lead to loosening of the round terminals.

[0128] In contrast, in this embodiment, by providing an extension 62 that extends from the cylindrical portion 61 in a manner intersecting the axial direction of the cylindrical portion 61 and connects to the terminal block 50, it is possible to suppress the increase in volume while maintaining the lower limit of the bending radius of the stranded wire. Furthermore, by providing multiple elastic members 71 and 72, each having recesses 71a and 72a formed along the power lines 35U, 35V, and 35W, a holding force is provided when each elastic member 71 and 72 is installed in the opening 4h. Therefore, even when a larger external force is applied to the rotary motor 1 compared to that applied to a car or similar vehicle, vibration and resonance of the power lines 35U, 35V, and 35W can be suppressed, thus preventing terminal loosening and other issues.

[0129] <Variation Example>

[0130] In the above embodiments, an example has been described where the power line includes a connecting member for connecting the power line to a terminal block. The connecting member includes a cylindrical portion for connecting the power line extending from the opening and an extension portion extending from the cylindrical portion in a manner intersecting the axial direction of the cylindrical portion and connecting to the terminal block. However, this is not a limitation. For example, the connecting member may also be a circular terminal having an extension portion extending parallel to the axial direction of the cylindrical portion. The structure of the connecting member can be changed according to design specifications.

[0131] In the above embodiments, examples were given where, when viewed from directions orthogonal to both the axis of the cylinder and the straight line along the extension, the angle between the axis of the cylinder and the straight line along the extension exceeds 0 degrees and is less than 90 degrees, but this is not a limitation. For example, when viewed from directions orthogonal to both the axis of the cylinder and the straight line along the extension, the angle between the axis of the cylinder and the straight line along the extension may also exceed 90 degrees. When viewed from directions orthogonal to both the axis of the cylinder and the straight line along the extension, the angle between the axis of the cylinder and the straight line along the extension can be varied according to design specifications.

[0132] In the above embodiment, an example was given where the power line extending from the opening bends and extends in a curved manner toward the opposite side of the rotary motor's axis in front of the terminal block, but this is not a limitation. For example, the power line extending from the opening may also bend and extend in a curved manner toward the opposite side of the rotary motor's axis on the inside of the terminal block. The manner in which the power line extends can be changed according to design specifications.

[0133] In the above embodiments, an example of connecting the cylindrical section to the end of the curved power line has been given, but the method is not limited thereto. For example, the cylindrical section may also be connected to a portion (midway) closer to the end of the curved power line. The connection method of the cylindrical section can be changed according to design specifications.

[0134] In the above embodiment, an example was described where the extension crosses the cylindrical portion obliquely relative to its axial direction and extends toward the terminal block, but this is not the only possible explanation. For example, the extension may also cross the cylindrical portion obliquely relative to its axial direction and extend in a direction different from the terminal block. For example, the extension may also extend toward a connecting member that connects to the terminal block. For example, the extension may be directly connected to the terminal block or indirectly connected via a connecting member or the like. The connection method of the extension can be varied according to design specifications.

[0135] In the above embodiments, an example of stator coils being made of flat wire was given, but the method is not limited to this. For example, stator coils can also be made of round wire. The structure of the stator coils can be changed according to design specifications.

[0136] In the above embodiments, the rotary motor further includes multiple elastic members, each having a recess along the outer periphery of the power line, and arranged adjacent to each other to block the opening. The multiple elastic members are mounted at the opening with their respective recesses facing each other across the power line, but this is not a limitation. For example, the rotary motor may also have a single elastic member with a hole. For example, the rotary motor may also have a conventional cable sheath as an elastic member. The type of elastic member can be changed according to design specifications.

[0137] In the above embodiment, an example was described where, when viewed from the axial direction of the rotating motor, the opening and multiple elastic members are each formed in an arc shape along the circumference of the rotating motor, and multiple recesses are formed at intervals along the circumference of each of the multiple elastic members. However, this is not a limitation. For example, the multiple elastic members may also be divided in the circumference of the rotating motor. For example, multiple elastic members may be provided corresponding to multiple power lines. For example, one elastic member may be provided for each power line of each phase. The arrangement of the elastic members can be changed according to design specifications.

[0138] In the above embodiments, an example was given where the shape formed by the combination of the opposing recesses when viewed from the axial direction of the rotary motor is an ellipse, but this is not a limitation. For example, the shape formed by the combination of the opposing recesses when viewed from the axial direction of the rotary motor can also be an oblong shape or a perfect circle. The shape formed by the combination of the opposing recesses when viewed from the axial direction of the rotary motor can be changed according to design specifications.

[0139] In the above embodiments, an example has been described where the rotary motor also includes a retaining member on the housing that holds the power line and the retaining member holds the curved portion of the power line, but this is not a limitation. For example, the retaining member may also hold the portion of the power line other than the curved portion. For example, the rotary motor may also not have a retaining member. The arrangement of the retaining member can be changed according to design specifications.

[0140] In the above embodiments, the following example is given: Multiple power lines are provided, and the rotary motor further includes a constraint member disposed between the opening and the retaining member when viewed from the axial direction of the rotary motor. The constraint member constrains the multiple power lines together in a manner where each power line is separately disposed relative to the cover of the rotary motor, but is not limited to this. For example, the constraint member may also centrally constrain the multiple power lines in a manner where each power line is in contact with the cover of the rotary motor. For example, the rotary motor may also not include a constraint member. The arrangement of the constraint member can be changed according to design specifications.

[0141] In the above embodiments, an example of a stator coil having a group of three-phase windings connected in parallel has been given, but this is not the only example. For instance, the stator coil may also have a group of three-phase windings connected in series. The structure of the winding group and the stator (the relationship between poles, phases, slots, etc.) can be changed according to the design specifications.

[0142] In the above embodiments, an example of a stator coil having multiple segmented coils in a U-shape with their ends connected to each other has been described, but the embodiments are not limited to this. For example, the stator coil may also have coils continuously wound into a wavy shape. The structure of the stator coil can be changed according to design specifications.

[0143] In the above embodiments, an example has been described where the rotary electric motor includes a rotor, the stator described above, and a housing that houses the rotor and stator, with multiple end-side extensions arranged axially on the side opposite to the bottom of the housing; however, this is not a limitation. For example, the multiple end-side extensions may also be arranged axially on the same side as the bottom of the housing (the side opposite to the opening). The arrangement of the multiple end-side extensions can be changed according to design specifications.

[0144] In the above embodiments, the rotary motor is mounted on a hybrid excavator or an electric excavator. An electric rotary motor used to rotate the upper slewing body of the hybrid excavator or electric excavator has been used as an example, but the description is not limited to this. For example, the rotary motor can also be mounted on other working machinery such as wheel loaders, bulldozers, and dump trucks. For example, the rotary motor can also be configured as a drive motor for driving the working device or a drive motor for driving the traveling device. The type of working machinery equipped with the rotary motor and the object driven by the rotary motor can be changed according to design specifications.

[0145] In the above embodiments, an example of a rotary motor being longitudinally positioned with its rotor shaft parallel to its rotation axis has been given, but this is not the only possible configuration. For example, the rotary motor may also be transversely positioned with its rotor shaft orthogonal to its rotation axis. For example, the rotary motor may also be configured at an angle with its rotor shaft intersecting the rotation axis at an angle. The configuration of the rotary motor can be changed according to design specifications.

[0146] In the above embodiments, an example of an inner rotor type rotary motor in which the stator is arranged outside a cylindrical rotor has been described, but it is not limited to this. For example, a rotary motor can also be an outer rotor type rotary motor in which the stator is arranged inside a cup-shaped rotor. The model of the rotary motor can be changed according to the design specifications.

[0147] In the above embodiments, a rotary motor has been described as an example of a motor that drives the rotor to rotate by allowing alternating current to flow through the stator coils, but it is not limited to this. For example, a rotary motor can also be a generator that generates electricity by rotating the rotor using the power of an engine or the like. The type of rotary motor can be changed according to design specifications.

[0148] The above description of one embodiment is based on the accompanying drawings. However, the specific structure is not limited to the structure described above. Without departing from the spirit of this disclosure, additions, omissions, substitutions and other changes to the structure can be made, and the above embodiments can be appropriately combined.

[0149] Explanation of reference numerals in the attached figures:

[0150] 1…rotary motor, 4…housing, 4h…opening, 31…stator coil, 35U, 35V, 35W…power line, 35a…bend, 50…terminal block, 60…connecting member, 61…cylinder, 61C…axis, 62…extension, 62C…straight line, 71, 72…elastic member, 71a, 72a…recess, 81…holding member, 82…constraint member, 100…working machine, 114…rotary motor, 120…driving body, 140…upper rotating body, 160…working device, A…angle, H…axial difference, TP…axial end position.

Claims

1. A rotary electric motor, wherein, The rotary motor includes: A housing that houses the stator coils and has an opening; A power line, which is connected to the stator coil and leads out from the opening; and External terminals, which are disposed in the housing and have terminal blocks, The power line extends from the stator coil to one side of the rotating motor along the axial direction and connects to the stator coil and the terminal block in a bent manner. The bent portion is located on the side of the rotary motor that is closer to the axial direction than the terminal block.

2. The rotary motor according to claim 1, wherein, The power line has a connecting member for connecting the power line to the terminal block. The connecting member includes: A cylindrical section, which is connected to the power line extending from the opening; and An extension extends from the cylindrical portion in a manner that intersects the axial direction of the cylindrical portion and is connected to the terminal block.

3. The rotary motor according to claim 2, wherein, When viewed from a direction orthogonal to the axis of the cylinder and the straight line along the extension, the angle between the axis of the cylinder and the straight line along the extension is greater than 0 degrees and less than 90 degrees.

4. The rotary motor according to claim 2 or 3, wherein, The power line extending from the opening curves in front of the terminal block toward the opposite side of the axial direction of the rotary motor. The cylindrical portion is connected to the end of the power line, which extends in a curved manner. The extension crosses obliquely from the cylindrical portion relative to the axial direction of the cylindrical portion and extends toward the terminal block.

5. The rotary motor according to claim 1 or 2, wherein, The stator coil is made of flat wire.

6. The rotary electric motor according to claim 1 or 2, wherein, The rotary motor also includes a plurality of elastic members, each having a recess along the outer periphery of the power line, and arranged adjacent to each other to block the opening. The plurality of elastic members are installed in the opening with each of the recesses facing each other across the power line.

7. The rotary electric motor according to claim 6, wherein, When viewed from the axial direction of the rotary motor, the opening and the plurality of elastic members are respectively formed in an arc shape along the circumference of the rotary motor. The plurality of recesses are formed at intervals along the circumferential direction in the plurality of elastic members.

8. The rotary electric motor according to claim 6, wherein, When viewed from the axial direction of the rotary motor, the shape formed by combining the opposing recesses is an ellipse.

9. The rotary electric motor according to claim 1 or 2, wherein, The rotary motor also includes a retaining member that holds the power line on the housing. The retaining member retains the curved portion of the power line.

10. The rotary electric motor according to claim 9, wherein, The power lines are provided in multiple ways. The rotary motor also includes a constraint member, which, when viewed from the axial direction of the rotary motor, is positioned between the opening and the retaining member. The constraint member constrains the multiple power lines together in such a way that the multiple power lines are respectively arranged separately relative to the cover of the rotary motor.

11. A type of operating machinery, wherein, The operating machinery includes: Vehicle body; The upper rotating body is supported on the traveling body in a manner that allows it to rotate about a pivot axis; A working device, which is supported on the upper rotating body in an operable manner; as well as The rotary motor according to claim 1 or 2 is configured as a rotary motor for rotating the upper rotating body relative to the traveling body.

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