Stator, rotary electric machine, and construction machine

Abstract

The stator has a stator coil wound around a cylindrical stator core, and has a plurality of end-side extensions extending outward from a first end surface in an axial direction of the stator core and arranged in a circumferential direction of the stator core, the plurality of end-side extensions including a first extension and a second extension, the first extension and the second extension being curved between a portion connected to a power line and the first end surface and being adjacent to each other in the circumferential direction, and the curved positions of the first extension and the second extension being different from each other in the axial direction.

Description

Technical Field

[0001] This disclosure relates to stators, rotating electrical machines, and engineering machinery.

[0002] This disclosure claims priority based on Japanese Patent Application No. 2023-223120 filed in Japan on December 28, 2023, the contents of which are incorporated herein by reference. Background Technology

[0003] Conventionally, as a stator of a rotary electric machine, there is a known structure having a stator coil wound around a cylindrical stator core, and having a plurality of end-side extensions extending outward from a first end face in the axial direction of the stator core and arranged circumferentially along the stator core (see Patent Document 1).

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: International Publication No. 2017 / 168971 Summary of the Invention

[0007] The technical problem that the invention aims to solve

[0008] However, in the structure of Patent Document 1, depending on the location of the connecting power line and the location of the bent coil, there is a possibility that the assemblability of connecting the power line will deteriorate, the number of parts will increase, and the size will increase.

[0009] The purpose of this disclosure is to provide a stator, rotary motor, and engineering machinery that can achieve improved assemblability, reduced number of parts, and miniaturization.

[0010] Technical solutions for solving technical problems

[0011] The stator of one embodiment of the present disclosure includes a stator coil wound around a cylindrical stator core and having a plurality of end-side extensions extending outward from a first end face in the axial direction of the stator core and arranged in the circumferential direction of the stator core. The plurality of end-side extensions include a first extension and a second extension that are bent between the portion connecting the power line and the first end face and are adjacent to each other in the circumferential direction. The bending positions of the first extension and the second extension are different from each other in the axial direction.

[0012] Invention Effects

[0013] According to the present disclosure, a stator, rotary motor, and engineering machinery can be provided that can achieve improved assemblability, reduced number of parts, and miniaturization. Attached Figure Description

[0014] Figure 1It is a schematic diagram of the engineering machinery used to illustrate the implementation method.

[0015] Figure 2 This is a cross-sectional view of the rotary motor according to the embodiment.

[0016] Figure 3 This is a three-dimensional view of the stator in the implementation method.

[0017] Figure 4 This is a perspective view of the inner periphery of the stator in the embodiment.

[0018] Figure 5 This is a perspective view showing the distance between the bending position of the first extension and the second extension in the embodiment and the reference position.

[0019] Figure 6 This is a diagram showing the bending position of the coil in the comparative example. Detailed Implementation

[0020] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In this embodiment, an example of a rotary motor mounted on an electric rotary excavator (an example of construction machinery) and configured to rotate the upper rotating body of the electric rotary excavator will be described as an example of a rotary motor.

[0021] 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 of 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 may be appropriately altered to show them as recognizable sizes.

[0022] <Construction Machinery>

[0023] Figure 1 This is a schematic diagram illustrating the construction machinery of the embodiment. The construction machinery 100 in this embodiment is an electric hydraulic excavator. The construction machinery 100 can be a manned vehicle operated by a driver or an unmanned vehicle.

[0024] The construction machinery 100 includes a traveling body 120, an upper rotating body 140, and a working device 160.

[0025] The traveling body 120 supports the construction machinery 100 for movement. The traveling body 120 includes a traveling mechanism 121, which may be, for example, a pair of left and right tracks. The traveling mechanism 121 is driven by a traveling motor 122. An upper rotating body 140 is rotatably supported on the traveling body 120 about a rotation axis. The upper rotating body 140 rotates relative to the traveling body 120 via a rotating motor 114. The upper rotating body 140 has a partition 141 for accommodating the drive system.

[0026] The working device 160 is movably supported on the upper rotating body 140. The working device 160 is hydraulically driven. The working device 160 includes a boom 161, a forearm 162, and an auxiliary device 163. The auxiliary device 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, the side of the upper rotating body 140 that supports the working device 160 is the front, 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.

[0027] The rotary motor 114 is an electric motor driven by electricity (an example of a rotary motor). The rotary motor 114 causes the upper rotating body 140 to rotate relative to the traveling body 120.

[0028] Rotary Electric Machine

[0029] Figure 2 This is a cross-sectional view of the rotary motor 1 according to the embodiment.

[0030] 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 arranged longitudinally with the rotor shaft 20 of the rotor 2 parallel to the rotation axis.

[0031] 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".

[0032] 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.

[0033] 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.

[0034] 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 axial outside. The upper plate 22 and the lower plate 23 rotate integrally with the rotor shaft 20 and the rotor core 21.

[0035] 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 is constructed by stacking electromagnetic steel plates axially, similar to the rotor core 21. On the inner periphery of the stator core 30, multiple teeth are provided on the circumference. The stator coil 31 is wound and mounted on the teeth.

[0036] 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 accommodating the rotor 2 and the stator 3 is formed inside the housing 4.

[0037] <Stator>

[0038] Figure 3 This is a perspective view of stator 3 according to the embodiment. See also... Figure 2 and Figure 3 The stator 3 includes: a cylindrical stator core 30 formed by arranging a plurality of slots 30s in the circumferential direction; and a stator coil 31 inserted into the plurality of 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 in the axial direction of the stator core 30 and arranged in the circumferential direction.

[0039] 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 may be provided in the slots 30s. Furthermore, the arrangement (configuration, quantity, shape, etc.) of the slots 30s can be changed according to design specifications.

[0040] In this embodiment, the stator coil 31 is composed of a flat wire. The stator coil 31 is composed of a plurality of U-shaped segmented coils 39 connected at their ends. The stator coil 31 is formed by winding the plurality of segmented coils 39, whose ends are connected to each other, into a wavy shape. For example, the segmented coils 39 are flat wires with an insulating film covering their outer periphery. Furthermore, the segmented coils 39 are not limited to the above and may also be configured as windings including circular or elliptical cross-sections. The structural form of the segmented coils 39 can be changed according to design specifications.

[0041] 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 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. In addition, in the stator core 30, the radial direction is the direction perpendicular to the axial direction, and the circumferential direction is the direction around the central axis CL.

[0042] 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 opposite side (upper side) of the bottom 13 of the housing 4.

[0043] Figure 4 This is a perspective view of the inner periphery of the stator 3 according to the embodiment.

[0044] Refer to together Figure 3 and Figure 4 The stator 3 in this embodiment also includes power lines 35U, 35V, and 35W connected to a plurality of end-side extensions 32e. The plurality of end-side extensions 32e include connecting extensions 32j that connect to the power lines 35U, 35V, and 35W, and non-connecting extensions 32u that do not connect to 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. A connecting member 38 for connecting the power lines 35U, 35V, and 35W is connected to the connecting extension 32j. The connecting member 38 is connected to the terminals of the power lines 35U, 35V, and 35W.

[0045] 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 of phases U, V, and W, respectively. The winding groups 34U1, 34U2, 34V1, 34V2, 34W1, and 34W2 of phases U, V, and W are arranged in pairs along the circumference of the stator core 30, with each pair consisting of two phases U, U, V, V, W, W, ...

[0046] <Bending positions of the first extension and the second extension>

[0047] Figure 5 This is a perspective view showing the distances D1 and D2 between the bending positions P1 and P2 of the first extension 32j1 and the second extension 32j2 in the embodiment and the reference position Pc.

[0048] Refer to together Figures 3 to 5 Multiple end-side extensions 32e include a first extension 32j1 and a second extension 32j2 that are bent between the portion connecting the power lines 35U, 35V, and 35W and the first end face 30f1 and are adjacent to each other in the circumferential direction. In the illustrated example, the first extension 32j1 and the second extension 32j2 constitute the connecting extension 32j.

[0049] The bending positions P1 and P2 of the first extension 32j1 and the second extension 32j2 are different in the axial direction. It should be noted that the bending positions P1 and P2 refer to the bending positions between the part connecting the power lines 35U, 35V, and 35W and the first end face 30f1, and in front of the part connecting the power lines 35U, 35V, and 35W (excluding the bending positions near the first end face 30f1).

[0050] In this embodiment, the bending position P1 of the first extension 32j1 is positioned axially outward (upper side) from the reference position Pc. The reference position Pc refers to the normal bending position (equivalent to the bending position of the end-side extension 32e in the non-connecting extension 32u). The bending position P2 of the second extension 32j2 is positioned axially inward (lower side) from the reference position Pc.

[0051] In this embodiment, the distances D1 and D2 of the bending positions P1 and P2 of the first extension 32j1 and the second extension 32j2 from the reference position Pc are the same. The distances D1 and D2 of the bending positions P1 and P2 from the reference position Pc mean the interval (length) between the reference position Pc and the bending positions P1 and P2 in the axial direction.

[0052] Furthermore, not limited to the above, the distance D1 between the bending position P1 of the first extension 32j1 and the reference position Pc can also be set within the range of 1 / 2 to 2 times the distance D2 between the bending position P2 of the second extension 32j2 and the reference position Pc. The distances D1 and D2 between the bending positions P1 and P2 of the first extension 32j1 and the second extension 32j2 and the reference position Pc can be changed according to design specifications.

[0053] In this embodiment, the first extension 32j1 and the second extension 32j2 each have an inclined portion 32s1 that intersects the first end face 30f1 and the bending positions P1 and P2 at an inclination relative to the axial and circumferential directions. The inclined portions 32s1 of the first extension 32j1 and the second extension 32j2 are configured to be separated from each other in the axial and circumferential directions. The separated portions of the inclined portions 32s1 of the first extension 32j1 and the second extension 32j2 have a gap (space) throughout the entire length along the inclination direction of the inclined portion 32s1.

[0054] In this embodiment, the first extension 32j1 and the second extension 32j2 each have a straight portion 32s2 extending in a straight line along the axial direction between the portion connecting the power lines 35U, 35V, and 35W and the bending positions P1 and P2. The straight portions 32s2 of the first extension 32j1 and the second extension 32j2 are arranged adjacent to each other in the circumferential direction. The straight portions 32s2 of the first extension 32j1 and the second extension 32j2 are arranged such that their circumferentially opposite sides are in contact or close to each other. It should be noted that the bending positions P1 and P2 are respectively located in the first extension 32j1 and the second extension 32j2 at the junction of the inclined portion 32s1 and the straight portion 32s2 (in other words, between the upper end of the inclined portion 32s1 and the lower end of the straight portion 32s2).

[0055] In this embodiment, the straight portion 32s2 of each of the first extension 32j1 and the second extension 32j2 is connected to the power lines 35U, 35V, and 35W at a position extending axially outward (upper side) from a position adjacent to each other in the circumferential direction. When the straight portion 32s2 of each of the first extension 32j1 and the second extension 32j2 are in contact with each other on opposite sides in the circumferential direction, they are connected to the power lines 35U, 35V, and 35W at a position extending axially outward (upper side) from the contact surface (side side).

[0056] In this embodiment, the stator 3 further includes a connecting member 38 for connecting the power lines 35U, 35V, and 35W to the first extension 32j1 and the second extension 32j2, respectively. The connecting member 38 includes a cylindrical portion 38a connected to the outer axial ends of the first extension 32j1 and the second extension 32j2, and an extension portion 38b extending from the cylindrical portion 38a and connected to the power lines 35U, 35V, and 35W.

[0057] Therefore, the axial outer ends of the first extension 32j1 and the second extension 32j2 can be connected by pressing them together using the cylindrical portion 38a of the connecting member 38. In the illustrated example, the axial outer ends of the straight portions 32s2 of the first extension 32j1 and the second extension 32j2 are pressed together within the cylindrical portion 38a using a riveting-based joining method. It should be noted that the axial outer ends of the straight portions 32s2 of the first extension 32j1 and the second extension 32j2 are not limited to the above-described method; they can also be welded. The connection method of the axial outer ends of the respective straight portions 32s2 can be changed according to design specifications.

[0058] The extension 38b extends axially outward (upper side) from the cylindrical portion 38a. The extension 38b is connected to the terminals of the power lines 35U, 35V, and 35W via bolt and nut fastening. A through hole for the bolt is formed in the extension 38b. Furthermore, the connection method between the extension 38b and the terminals of the power lines 35U, 35V, and 35W is not limited to the above method and can be modified according to design specifications.

[0059] In this embodiment, multiple power lines 35U, 35V, and 35W are provided. Multiple connecting members 38 are provided corresponding to the multiple power lines 35U, 35V, and 35W. The multiple connecting members 38 are each axially positioned at the same location as each other. The connection points (e.g., at the center of the hole through which the bolt passes in the extension 38b) of each of the multiple connecting members 38 are axially positioned at the same location as each other.

[0060] In the illustrated example, the shapes of the multiple connecting parts 38 are all the same. However, the shapes of the multiple connecting parts 38 are not limited to those described above and may also be different from each other. The shapes of the multiple connecting parts 38 can be changed according to design specifications.

[0061] <Effects>

[0062] As described above, the stator 3 of this embodiment includes a stator coil 31 wound around a cylindrical stator core 30, and has a plurality of end-side extensions 32e extending outward from a first end face 30f1 in the axial direction of the stator core 30 and arranged circumferentially along the stator core 30. The plurality of end-side extensions 32e include a first extension 32j1 and a second extension 32j2 that are bent between the portion connecting the power lines 35U, 35V, and 35W and the first end face 30f1 and are circumferentially adjacent to each other. The bending positions P1 and P2 of the first extension 32j1 and the second extension 32j2 are different in the axial direction.

[0063] For example, Figure 6 This refers to a situation where the bending positions of multiple end-side extensions are the same in the axial direction. In this case, the multiple end-side extensions are separated in the circumferential direction, making it difficult to connect them to the power line. When multiple end-side extensions are separated in the circumferential direction, other components (busbars, etc.) are needed to connect the coils to each other when connecting them to the power line. Figure 6 The two end extensions (enclosed by dashed lines) are connected. Therefore, poor assemblability, increased number of parts, and larger size become technical problems.

[0064] In contrast, according to this embodiment, the bending positions P1 and P2 of the first extension 32j1 and the second extension 32j2 are different in the axial direction, thereby... Figure 6 Compared to the comparative example, the coils (first extension 32j1 and second extension 32j2) can be brought close to each other in the circumferential direction. Therefore, the close-proximity first extension 32j1 and second extension 32j2 can be connected to the power lines 35U, 35V, and 35W without the need for connection through other components (busbars, etc.). Thus, improved assemblability, reduction in the number of parts, and miniaturization can be achieved.

[0065] In this embodiment, the bending position P1 of the first extension 32j1 is located axially outward from the reference position Pc. The bending position P2 of the second extension 32j2 is located axially inward from the reference position Pc.

[0066] For example, as a structure for making the bending positions P1 and P2 of the first extension 32j1 and the second extension 32j2 different in the axial direction, the following structures can be considered: without changing the bending position P1 of the first extension 32j1, the bending position P2 of the second extension 32j2 is positioned further inward in the axial direction, or without changing the bending position P2 of the second extension 32j2, the bending position P1 of the first extension 32j1 is positioned further outward in the axial direction. However, in these structures, it is difficult to handle the situation where the target position for connecting the first extension 32j1 and the second extension 32j2 to the power lines 35U, 35V, and 35W is set at a predetermined position in the circumferential direction (e.g., the central position between the non-connecting extensions 32u adjacent to the first extension 32j1 and the second extension 32j2 in the circumferential direction). In contrast, according to this embodiment, the bending positions P1 and P2 of the first extension 32j1 and the second extension 32j2 are arranged on opposite sides of the axial direction relative to the reference position Pc. Therefore, even if the target positions for connecting the first extension 32j1 and the second extension 32j2 to the power lines 35U, 35V, and 35W are set as described above, it can be easily handled.

[0067] In this embodiment, the bending positions P1 and P2 of the first extension 32j1 and the second extension 32j2 are at the same distances D1 and D2 from the reference position Pc.

[0068] According to this embodiment, even if the target positions for connecting the first extension 32j1 and the second extension 32j2 to the power lines 35U, 35V, and 35W are set as described above, it is easier to handle the situation.

[0069] In this embodiment, the first extension 32j1 and the second extension 32j2 each have an inclined portion 32s1 that intersects the first end face 30f1 and the bending positions P1 and P2 at an inclination relative to the axial and circumferential directions. The inclined portions 32s1 of the first extension 32j1 and the second extension 32j2 are configured to be separated from each other in the axial and circumferential directions.

[0070] According to this embodiment, the portion that can be separated from the inclined portion 32s1 of the first extension 32j1 and the second extension 32j2 allows for dimensional errors, thus helping to improve assemblability in the face of dimensional errors.

[0071] In this embodiment, the first extension 32j1 and the second extension 32j2 each have a straight portion 32s2 extending in a straight line along the axial direction between the portion connecting the power lines 35U, 35V, and 35W and the bending positions P1 and P2. The straight portions 32s2 of the first extension 32j1 and the second extension 32j2 are arranged adjacent to each other in the circumferential direction.

[0072] According to this embodiment, the straight sections 32s2 that are adjacent to each other in the circumferential direction can be connected to each other with power lines 35U, 35V, and 35W, which helps to further improve assemblability, reduce the number of parts, and miniaturize.

[0073] In this embodiment, the straight portion 32s2 of each of the first extension 32j1 and the second extension 32j2 is connected to the power lines 35U, 35V, and 35W at a position extending outward from a position adjacent to each other in the circumferential direction.

[0074] For example, when connecting the power line to a section extending radially from a specified position, it is necessary to weld the radially extending sections together or connect them using other components (busbars, resin units, etc.). Therefore, the stator becomes larger in the radial direction, and there is a high possibility that the overall rotary motor, including the housing, will become larger in the radial direction.

[0075] In contrast, according to this embodiment, each straight section 32s2 is connected to the power lines 35U, 35V, and 35W at a position extending outward from a position adjacent to each other in the circumferential direction, thereby eliminating the need for connection using other components (busbars, resin units, etc.). Therefore, this facilitates further assemblability, reduction of the number of parts, and miniaturization.

[0076] In this embodiment, the stator coil 31 is made of flat wire.

[0077] 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 for it to extend straight. Even in this case, the straight-extending flat wire can be connected to the power lines 35U, 35V, and 35W at a position extending axially outward as described above, thus providing significant practical benefits.

[0078] In this embodiment, the stator 3 further includes a connecting member 38 for connecting the power lines 35U, 35V, and 35W to the first extension 32j1 and the second extension 32j2, respectively. The connecting member 38 includes a cylindrical portion 38a connected to the outer axial ends of the first extension 32j1 and the second extension 32j2, and an extension portion 38b extending from the cylindrical portion 38a and connected to the power lines 35U, 35V, and 35W.

[0079] According to this embodiment, the axial outer ends of the first extension 32j1 and the second extension 32j2 can be pressed together using the cylindrical portion 38a of the connecting member 38, and the extension 38b extending from the cylindrical portion 38a can be connected to the power lines 35U, 35V, and 35W without the need for other components (busbars, etc.) for connection. Therefore, it contributes to further improvement in assemblability, further reduction in the number of components, and further miniaturization.

[0080] In this embodiment, multiple power lines 35U, 35V, and 35W are provided. Multiple connecting members 38 are provided corresponding to the multiple power lines 35U, 35V, and 35W. The multiple connecting members 38 are respectively arranged at the same position in the axial direction.

[0081] According to this embodiment, even when the target positions for connecting multiple connecting parts 38 to power lines 35U, 35V, and 35W are set at predetermined axial positions (e.g., axial positions corresponding to each reference position Pc), it is easy to handle the situation.

[0082] However, increasing the number of parallel flat wires requires additional components (busbars, etc.) to bundle them together in parallel, leading to poor assemblability, an increase in the number of components, and larger size. Furthermore, when the outermost winding section in the radial direction is connected to other components (busbars, etc.), the stator becomes larger in the radial direction, and the overall rotary motor, including the housing, is likely to become larger in the radial direction.

[0083] In contrast, in this embodiment, the bending positions P1 and P2 of the first extension 32j1 and the second extension 32j2 are changed axially in the winding portion located at the innermost circumference of the stator 3. Therefore, the straight portions 32s2 of adjacent flat wires can be connected to the power lines 35U, 35V, and 35W without causing the aforementioned problems. This contributes to further assemblability, reduction of the number of parts, and miniaturization.

[0084] <Variation Example>

[0085] In the above embodiments, examples have been given of the first extension being bent at a position axially outward from the reference position and the second extension being bent at a position axially inward from the reference position, but this is not a limitation. For example, as a structure to make the bending positions of the first and second extensions different in the axial direction, the bending position of the second extension may be positioned axially inward from the bending position of the first extension, or the bending position of the first extension may be positioned axially outward from the bending position of the second extension. The structure for making the bending positions of the first and second extensions different in the axial direction can be changed according to design specifications.

[0086] In the above embodiments, an example was given in which the bending positions of the first extension and the second extension are at the same distance from the reference position, but this is not a limitation. For example, the bending positions of the first extension and the second extension may be at different distances from the reference position. The bending positions of the first extension and the second extension may be varied according to design specifications.

[0087] In the above embodiments, an example has been described where the first extension and the second extension each have inclined portions that intersect each other obliquely in the axial and circumferential directions between the first end face and the bending position, and the inclined portions of the first extension and the second extension are configured to be separated from each other in the axial and circumferential directions, but this is not a limitation. For example, the inclined portions of the first extension and the second extension may also be configured to be in contact with each other. The configuration of the inclined portions of the first extension and the second extension can be changed according to design specifications.

[0088] In the above embodiments, an example has been described where the first extension and the second extension each have a straight portion extending in a straight line along the axial direction between the location connecting the power line and the bending position. The straight portions of the first extension and the second extension are arranged adjacent to each other in the circumferential direction, but this is not a limitation. For example, the straight portions of the first extension and the second extension may also be arranged to be separate from each other in the circumferential direction. The arrangement of the straight portions of the first extension and the second extension can be changed according to design specifications.

[0089] In the above embodiment, an example was given where the straight portions of the first and second extensions are connected to the power line at positions extending outward from adjacent positions in the circumferential direction, but this is not a limitation. For example, the first and second extensions may also be connected to the power line at portions extending radially from a predetermined position. The manner in which the first and second extensions are connected to the power line can be varied according to design specifications.

[0090] In the above embodiments, examples of stator coils made of flat wire have been given, but the embodiments are not limited to this. For example, stator coils may also be made of round wire. The structure of the stator coils can be changed according to design specifications.

[0091] In the above embodiments, the stator is described as further comprising a connecting member for connecting the power line to the first extension and the second extension respectively. The connecting member has a cylindrical portion connected to the axial outer ends of each of the first and second extensions, and an extension extending from the cylindrical portion and connected to the power line. However, this is not a limitation. For example, the axial outer ends of each of the first and second extensions may also be connected to the power line via other components (busbars, etc.). For example, the stator may also omit the aforementioned connecting member. The arrangement of the connecting member can be changed according to design specifications.

[0092] In the above embodiments, an example has been described where multiple power lines are provided, multiple connecting components are provided corresponding to the multiple power lines, and the multiple connecting components are respectively arranged in the same position in the axial direction, but this is not a limitation. For example, the multiple connecting components may also be arranged in different positions in the axial direction. The arrangement of the multiple connecting components can be changed according to the design specifications.

[0093] In the above embodiments, an example of a stator coil having a group of three-phase windings connected in parallel has been described, but it is not limited to this. For example, the stator coil may also have a group of three-phase windings connected in series. The structural configuration of the winding group and the stator (the relationship between poles, phases, slots, etc.) can be changed according to the design specifications.

[0094] 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.

[0095] 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 opposite side of 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 varied according to design specifications.

[0096] In the above embodiment, a rotary motor is mounted on an electric rotary excavator. An example of an electric rotary motor used to rotate the upper rotating body of the electric rotary excavator has been described, but it is not limited to this. For example, the rotary motor can also be mounted on other construction machinery such as wheel loaders, bulldozers, and dump trucks. For example, the rotary motor can also be configured as a drive motor for driving a working machine or a drive motor for driving a traveling device. The form of the construction machinery equipped with the rotary motor and the object driven by the rotary motor can be changed according to design specifications.

[0097] In the above embodiments, an example of a rotary motor being longitudinally positioned with its rotor shaft parallel to its rotation axis has been described, but the embodiment is not limited to this. 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.

[0098] 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, the rotary motor may also be an outer rotor type rotary motor in which the stator is arranged inside a cup-shaped rotor. The type of rotary motor can be changed according to design specifications.

[0099] In the above embodiments, an example of a rotary electric motor that drives the rotor to rotate by allowing alternating current to flow through the stator coils has been given, but the invention is not limited to this. For example, a rotary electric motor can also be a generator that generates electricity by rotating the rotor using the power of an engine or the like. The form of a rotary electric motor can be changed according to design specifications.

[0100] 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.

[0101] Explanation of reference numerals in the attached figures

[0102] 1: Rotary motor

[0103] 3: Stator

[0104] 30: Stator core

[0105] 30f: First end face

[0106] 31: Stator coil

[0107] 32e: End-side extension

[0108] 32j1: First extension

[0109] 32j2: Second extension

[0110] 32s1: Inclined part

[0111] 32s2: Straight part

[0112] 35U, 35V, 35W: Power line

[0113] 38: Connecting components

[0114] 38a: Cylindrical section

[0115] 38b: Extension

[0116] 100: Construction Machinery

[0117] 114: Rotary motor

[0118] 120: Driving body

[0119] 140: Upper Rotating Body

[0120] 160: Working device

[0121] D1, D2: Distance

[0122] P1, P2: Bending positions

[0123] Pc: Reference position

Claims

1. A stator, characterized in that, It includes a stator coil wound around a cylindrical stator core, and has a plurality of end-side extensions extending outward from a first end face in the axial direction of the stator core and arranged circumferentially on the stator core. The plurality of end-side extensions include a first extension and a second extension, the first extension and the second extension being bent between the first end face at the location where the power line is connected and adjacent to each other in the circumferential direction. The bending positions of the first extension and the second extension are different in the axial direction.

2. The stator according to claim 1, characterized in that, The bending position of the first extension is located on the outer side of the axial direction compared to the reference position. The bending position of the second extension is configured to be inside the axial direction than the reference position.

3. The stator according to claim 2, characterized in that, The bending positions of the first extension and the second extension are at the same distance from the reference position.

4. The stator according to claim 1 or 2, characterized in that, The first extension and the second extension each have an inclined portion, which intersects obliquely relative to the axial and circumferential directions between the first end face and the bent position. The inclined portions of the first extension and the second extension are respectively configured to be separated from each other in the axial and circumferential directions.

5. The stator according to claim 1 or 2, characterized in that, The first extension and the second extension each have a straight portion, which extends in a straight line along the axial direction between the portion connecting the power line and the curved position. The straight portions of the first extension and the second extension are respectively configured to be adjacent to each other in the circumferential direction.

6. The stator according to claim 5, characterized in that, The straight portions of the first extension and the second extension are connected to the power line at positions extending outward from adjacent positions in the circumferential direction toward the axial direction.

7. The stator according to claim 1 or 2, characterized in that, The stator coil is made of flat wire.

8. The stator according to claim 1 or 2, characterized in that, It also includes a connecting component for connecting the power line to the first extension and the second extension, respectively. The connecting member includes: a cylindrical portion connected to the outer axial ends of the first extension and the second extension, respectively; and an extension extending from the cylindrical portion and connected to the power line.

9. The stator according to claim 8, characterized in that, The power lines are provided in multiple ways. The connecting components are provided in multiple ways, corresponding to the multiple power lines. The plurality of connecting components are respectively arranged at the same position on each other in the axial direction.

10. A rotary electric motor, characterized in that, have: Rotor; The stator as described in claim 1 or 2; A housing that houses the rotor and the stator.

11. An engineering machinery, characterized in that, have: Vehicle; The upper rotating body is supported on the traveling body in a manner that allows it to rotate about a rotation axis; A working device, which is supported on the upper rotating body in an operable manner; The rotary motor of claim 10 is configured to rotate the upper rotating body relative to the traveling body.

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