Rotor, rotary electric machine, and work machine

Abstract

This rotor comprises: a cylindrical rotor core that is configured by laminating a plurality of steel plates in the axial direction of a rotor shaft and has a protruding part that protrudes to at least one direction on the outside in the axial direction; and a support plate which is disposed on the outside of the rotor core in the axial direction and in which a recessed part or a through-hole is formed in a region corresponding to the protruding part.

Description

Rotor, rotating electric machine and work machine

[0001] This disclosure claims priority to Japanese Patent Application No. 2024-011200, filed on January 29, 2024, the contents of which are incorporated herein by reference.

[0002] A rotor for a rotating electrical machine is known to have a configuration including a rotor shaft, a rotor core, and a support plate (see Patent Document 1). For example, the rotor core is formed by stacking a plurality of steel plates in the axial direction of the rotor shaft. The plurality of steel plates may be joined by a joining method using caulking.

[0003] Republished WO2017 / 168971

[0004] However, when multiple steel plates are joined by a joining method using caulking, there are two types of steel plates: one with a caulking hole and one with a caulking protrusion. When there are two types of steel plates, each steel plate must be manufactured separately, which increases the number of manufacturing processes and management man-hours, which may lead to an increase in manufacturing costs.

[0005] An object of aspects of the present disclosure is to provide a rotor, a rotating electric machine, and a work machine that can reduce manufacturing costs.

[0006] A rotor according to one aspect of the present disclosure comprises a cylindrical rotor core formed by stacking a plurality of steel plates in the axial direction of a rotor shaft and having a protrusion protruding outward from at least one side in the axial direction, and a support plate arranged on the axial outside of the rotor core and having a recess or through hole formed in a position corresponding to the protrusion.

[0007] According to aspects of the present disclosure, it is possible to provide a rotor, a rotating electric machine, and a work machine that can reduce manufacturing costs.

[0008] 1 is a schematic diagram showing a work machine according to an embodiment; FIG. 2 is a cross-sectional view of a rotary electric machine according to an embodiment; FIG. 3 is a cross-sectional view showing an upper part of a rotor according to an embodiment; FIG. 4 is an enlarged view of a portion IV of FIG. 3; FIG. 5 is a perspective view of a rotor core according to an embodiment; FIG. 6 is a plan view of a part of a steel plate of a rotor core according to an embodiment; FIG. 7 is an enlarged view of a part of a rotor according to a comparative example; FIG. 8 is a plan view of a part of a steel plate of a rotor core according to a comparative example; FIG. 9 is a view of a recess according to a first modified example, viewed from the axial direction; FIG. 10 is a cross-sectional view of a protrusion according to the first modified example; FIG. 11 is a view of a recess according to a second modified example, viewed from the axial direction; FIG. 12 is a cross-sectional view of a protrusion according to the second modified example;

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

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

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

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

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

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

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

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

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

[0018] In this embodiment, the upper side corresponds to one side parallel to the central axis CL of the rotor shaft 20, and the lower side corresponds to the other side parallel to the central axis CL of the rotor shaft 20. Hereinafter, the direction along the central axis CL of the rotor shaft 20 will be referred to as the "axial direction," the direction perpendicular to the axial direction will be referred to as the "radial direction," and the direction going around the central axis CL of the rotor shaft 20 will be referred to as the "circumferential direction."

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

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

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

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

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

[0024] <Rotor> FIG. 3 is a cross-sectional view showing an upper portion of the rotor 2 according to the embodiment. FIG. 4 is an enlarged view of portion IV in FIG. 3 . FIG. 5 is a perspective view of the rotor core 21 according to the embodiment. FIG. 6 is a plan view of a portion of a steel plate 21p of the rotor core 21 according to the embodiment. Referring to FIGS. 2 to 6 , the rotor 2 includes a cylindrical rotor core 21 formed by stacking a plurality of steel plates 21p in the axial direction of the rotor shaft 20 and having a protrusion 21c protruding outward from at least one axial end, and a support plate 22 disposed on the axially outer side of the rotor core 21 and having a recess 22h formed in a position corresponding to the protrusion 21c. The support plate 22 is a plate that sandwiches (supports) the rotor core 21. In the illustrated example, the support plate 22 is an end plate disposed at the outer end of the rotor core 21 in the axial direction, but is not limited thereto. For example, another plate may be disposed further outward from the support plate 22 (end plate).

[0025] In this embodiment, the plurality of steel plates 21p are joined by a joining method using crimping. The plurality of steel plates 21p are made of one type of steel plate 21p with crimping protrusions 21c. The rotor core 21 is made by stacking the plurality of crimping protrusion-equipped steel plates 21p (see FIG. 6) in the axial direction.

[0026] In this embodiment, each of the plurality of steel plates 21p has a convex portion 21m that protrudes outward in the axial direction at a position corresponding to the protrusion 21c. Each of the plurality of steel plates 21p includes a main body portion 21s that extends in a direction perpendicular to the axial direction, and a convex portion 21m that protrudes in a convex shape from a part of the main body portion 21s. In this embodiment, each of the plurality of steel plates 21p is joined at the convex portion 21m by a joining method using caulking.

[0027] In this embodiment, multiple protrusions 21c are provided at intervals in the circumferential direction of the rotor core 21. Multiple recesses 22h are formed to correspond to the multiple protrusions 21c. In the example shown in the figure, the multiple protrusions 21c are provided at equal intervals in the circumferential direction. The multiple recesses 22h are also formed at equal intervals in the circumferential direction. In the example shown in the figure, the multiple protrusions 21c protrude outward in the axial direction, but this is not limited to this. The protruding direction of the protrusions 21c can be changed according to design specifications.

[0028] A plurality of inner peripheral side holes 25 are formed on the radially inner side of rotor core 21. A plurality of outer peripheral side holes 26 are formed on the radially outer side of rotor core 21. A permanent magnet (not shown) is embedded in each of the plurality of outer peripheral side holes 26.

[0029] Referring also to Figure 2, the support plates 22, 23 function as weights (balancing rings) for adjusting the center of gravity of the rotor 2. In this embodiment, the support plates 22, 23 are provided as a pair to sandwich the rotor core 21 from both axial outer sides. Hereinafter, the pair of support plates 22, 23 will also be referred to as the upper plate 22 and the lower plate 23, respectively. In this embodiment, the recess 22h is formed in the upper plate 22 (an example of one of the pair of support plates facing the protrusion). The recess 22h is not formed in the lower plate 23 (an example of the other).

[0030] 4, in this embodiment, a protrusion 21c provided on a portion of the upper end side of the rotor core 21 is configured to fit into a recess 22h formed in a portion of the lower surface side of the upper plate 22. The protrusion 21c is configured by a convex portion 21m of the uppermost steel plate 21p1, which is the uppermost of the multiple steel plates 21p that constitute the rotor core 21. In the example shown in the figure, the convex portion 21m of the steel plate 21p2 that is second from the top (next to the uppermost steel plate 21p1) is also shown, and the steel plates 21p positioned third and subsequent to the top are not shown.

[0031] In this embodiment, the recess 22h is formed to surround the entire protrusion 21c. The recess 22h has an inner circumferential surface that surrounds the periphery of the protrusion 21c and a bottom surface that is connected to the upper edge of the inner circumferential surface and faces the protrusion 21c from the outside in the axial direction. In the example shown in the figure, the inner circumferential surface extends parallel to the axial direction, and the bottom surface extends in a direction perpendicular to the axial direction. Note that the configuration and shape of the recess 22h are not limited to those described above and can be changed according to design specifications.

[0032] In this embodiment, the innermost periphery of the recess 22h is located outside the outermost periphery of the protrusion 21c. The innermost periphery of the recess 22h refers to the innermost portion of the inner circumferential surface of the recess 22h. The outermost periphery of the protrusion 21c refers to the outermost portion of the outer periphery of the protrusion 21c.

[0033] In this embodiment, the minimum width W1 of the recess 22h in the in-plane direction perpendicular to the axial direction is 1.1 times or more the maximum width W2 of the protrusion 21c. The minimum width W1 of the recess 22h refers to the smallest spacing between the openings of the recess 22h in the in-plane direction along both the radial and circumferential directions (the spacing between portions of the inner circumferential surface of the recess 22h that face each other in the in-plane direction with the protrusion 21c interposed therebetween). The maximum width W2 of the protrusion 21c refers to the largest width between the openings of the protrusion 21c in the in-plane direction along both the radial and circumferential directions (the spacing between portions of the outer circumferential edge of the protrusion 21c that face each other in the in-plane direction).

[0034] In addition, from the viewpoint of more effectively tolerating dimensional errors of the convex portion 21c and / or the concave portion 22h, it is preferable that the minimum width W1 of the concave portion 22h in the in-plane direction perpendicular to the axial direction be 1.1 times or more the maximum width W2 of the convex portion 21c.

[0035] In this embodiment, the bottom surface of the recess 22h is located axially inward (lower) than the thickness center position TC of the upper plate 22. The thickness center position TC of the upper plate 22 corresponds to the center position of the upper plate 22 in the axial direction of the rotor 2. The bottom surface of the recess 22h is located at a position of the recess 22h that is axially outward (upper) from the axial outer end face (top surface) of the rotor core 21.

[0036] For example, it is desirable to make the size of the recess 22 h as small as possible from the viewpoint of making the upper plate 22 function more effectively as a balancing ring. Therefore, it is preferable that the bottom surface of the recess 22 h be located closer to the axial outer end surface (top surface) of the rotor core 21 than to the thickness center position TC of the upper plate 22.

[0037] In this embodiment, the minimum depth H1 of the recess 22h in the axial direction is 1.2 times or more the maximum height H2 of the protrusion 21c. The minimum depth H1 of the recess 22h refers to the smallest depth among the opening depths of the recess 22h in the axial direction (the distance between the bottom surface of the recess 22h and the axial outer surface of the main body 21s of the uppermost steel plate 21p1). The maximum height H2 of the protrusion 21c refers to the height of the tip of the protrusion 21c that protrudes outward in at least one direction in the axial direction (the height of the part farthest axially outward from the axial outer surface of the main body 21s of the uppermost steel plate 21p1).

[0038] In addition, from the viewpoint of more effectively tolerating dimensional errors of the convex portion 21c and / or the concave portion 22h, it is preferable that the minimum depth H1 of the concave portion 22h in the axial direction be 1.2 times or more the maximum height H2 of the convex portion 21c.

[0039] <Effects> As described above, the rotor 2 of this embodiment includes a cylindrical rotor core 21 formed by stacking multiple steel plates 21p in the axial direction of the rotor shaft 20 and having protruding portions 21c protruding on at least one axially outer side, and a support plate 22 disposed on the axially outer side of the rotor core 21 and having recessed portions 22h formed in positions corresponding to the protruding portions 21c. For example, when multiple steel plates are joined using a crimping joining method, two types of steel plates are used: one with crimping holes and one with crimping protrusions (see FIGS. 7 and 8 ). When there are two types of steel plates, each steel plate must be manufactured separately, which increases the number of manufacturing processes and management man-hours, potentially resulting in increased manufacturing costs. In contrast, according to this embodiment, the recessed portions 22h are formed in the support plate 22 in positions corresponding to the protruding portions 21c of the rotor core 21, thereby allowing the recessed portions 22h to avoid the protruding portions 21c, eliminating the need for steel plates with crimping holes (see FIG. 7 ). Therefore, the steel plate 21p is limited to one type, that is, the type with the crimping projections (see FIG. 6). This reduces the manufacturing cost. In addition, the number of parts can be reduced by eliminating the need for a steel plate with crimping holes.

[0040] In this embodiment, the recess 22h is formed to surround the entire protrusion 21c. According to this embodiment, the recess 22h can avoid the entire protrusion 21c, which improves the ease of assembly even when there is a dimensional error in the protrusion 21c.

[0041] In this embodiment, the innermost periphery of the recess 22h is located outside the outermost periphery of the protrusion 21c. According to this embodiment, the innermost periphery of the recess 22h can avoid the outermost periphery of the protrusion 21c, which improves the ease of assembly even when there is a dimensional error in the protrusion 21c.

[0042] In this embodiment, the minimum width W1 of the recess 22h in the in-plane direction perpendicular to the axial direction is 1.1 times or more the maximum width W2 of the protrusion 21c. According to this embodiment, the recess 22h can sufficiently avoid the protrusion 21c.

[0043] In this embodiment, the bottom surface of the recess 22h is located axially inward of the thickness center position TC of the support plate 22. According to this embodiment, the size of the recess 22h axially inward of the thickness center position TC of the support plate 22 can be minimized, allowing the support plate 22 to function more effectively as a balancing ring.

[0044] In this embodiment, the minimum depth H1 of the recess 22h in the axial direction is 1.2 times or more the maximum height H2 of the protrusion 21c. According to this embodiment, the recess 22h can sufficiently avoid the protrusion 21c.

[0045] In this embodiment, each of the plurality of steel plates 21p has a convex portion 21m that protrudes outward in the axial direction at a position corresponding to the protrusion 21c. According to this embodiment, the plurality of steel plates 21p can be joined by a joining method using caulking using the convex portion 21m of each of the plurality of steel plates 21p.

[0046] In this embodiment, a pair of support plates 22, 23 are provided to sandwich the rotor core 21 from both axially outer sides. The recess 22h is formed in one of the pair of support plates 22, 23 (the upper plate 22) that faces the protrusion 21c, and is not formed in the other (the lower plate 23). According to this embodiment, manufacturing costs can be reduced compared to when the recess 22h is formed in both of the pair of support plates 22, 23.

[0047] In this embodiment, the plurality of steel plates 21p are made of one type of steel plate 21p with crimping protrusions 21c. The rotor core 21 is made by stacking the plurality of steel plates 21p with crimping protrusions in the axial direction. According to this embodiment, all of the steel plates 21p constituting the rotor core 21 are joined by crimping, which reduces manufacturing costs.

[0048] In this embodiment, a plurality of protruding portions 21c are provided at intervals in the circumferential direction of rotor core 21. A plurality of recessed portions 22h are formed to correspond to each of the plurality of protruding portions 21c. According to this embodiment, even when a plurality of recessed portions 22h are provided in rotor core 21, each of the plurality of recessed portions 22h formed in support plate 22 can avoid each of the protruding portions 21c.

[0049] <Modifications> In the above-described embodiment, an example has been described in which the recess is formed to surround the entire protrusion, but this is not limiting. For example, the recess may be formed to surround only a portion of the protrusion. The manner in which the recess surrounds the protrusion can be changed according to design specifications.

[0050] In the above-described embodiment, an example has been described in which the innermost periphery of the recess is disposed outside the outermost periphery of the protrusion, but this is not limiting. For example, at least a portion of the innermost periphery of the recess may be disposed inside the outermost periphery of the protrusion. The arrangement of the innermost periphery of the recess and the outermost periphery of the protrusion can be changed according to design specifications.

[0051] In the above-described embodiment, the minimum width of the recess in the in-plane direction perpendicular to the axial direction is 1.1 times or more the maximum width of the protrusion, but this is not limited to this. For example, the minimum width of the recess in the in-plane direction perpendicular to the axial direction may be less than 1.1 times the maximum width of the protrusion. The minimum width of the recess in the in-plane direction perpendicular to the axial direction can be changed according to the design specifications.

[0052] In the above-described embodiment, the bottom surface of the recess is disposed axially inward from the center of the thickness of the support plate, but this is not limiting. For example, the bottom surface of the recess may be disposed axially outward from the center of the thickness of the support plate. The arrangement of the bottom surface of the recess can be changed according to design specifications.

[0053] In the above-described embodiment, the minimum depth of the recess in the axial direction is 1.2 times or more the maximum height of the protrusion, but this is not limiting. For example, the minimum depth of the recess in the axial direction may be less than 1.2 times the maximum height of the protrusion. The minimum depth of the recess in the axial direction can be changed according to design specifications.

[0054] In the above-described embodiment, an example has been described in which each of the plurality of steel plates has a convex portion that protrudes outward in the axial direction at a location corresponding to the protrusion, but this is not limited to this. For example, at least one of the plurality of steel plates does not have to have a convex portion that protrudes outward in the axial direction at a location corresponding to the protrusion. The arrangement of the convex portion can be changed according to design specifications.

[0055] In the above-described embodiment, a pair of support plates are provided to sandwich the rotor core from both axially outer sides, and a recess is formed in one of the pair of support plates facing the protrusion, while the other is not. However, this is not limited to this. For example, recesses may be formed in both of the pair of support plates. For example, the pair of support plates may be formed with the same shape. This allows the pair of support plates to be constructed using only one type of support plate with recesses formed therein, thereby contributing to a reduction in the number of parts. The manner in which the recesses are formed in the pair of support plates can be changed according to design specifications.

[0056] In the above-described embodiment, the plurality of steel plates are formed of one type of steel plate with crimping protrusions, and the rotor core is formed by stacking a plurality of steel plates with crimping protrusions in the axial direction. However, this is not limiting. For example, the plurality of steel plates may be formed of one type of steel plate with protrusions other than those for crimping, and the rotor core may be formed by stacking a plurality of steel plates with protrusions in the axial direction. The configuration of the rotor core can be changed according to the design specifications.

[0057] In the above-described embodiment, an example has been described in which a plurality of protrusions are provided at intervals in the circumferential direction of the rotor core, and a plurality of recesses are formed to correspond to each of the plurality of protrusions, but this is not limited thereto. For example, one protrusion may be provided on the rotor core, and one recess may be formed to correspond to one protrusion. The configuration (number, arrangement, etc.) of the protrusions provided on the rotor and / or the configuration (number, arrangement, etc.) of the recesses formed on the support plate can be changed according to design specifications.

[0058] In the above-described embodiment, an example has been described in which recesses are formed in the support plate at positions corresponding to the protrusions of the rotor core, but this is not limiting. For example, through holes may be formed in the support plate at positions corresponding to the protrusions of the rotor core. The manner in which the recesses or through holes are formed in the support plate can be changed according to design specifications.

[0059] For example, the shape of the recess as viewed from the axial direction may be rectangular to match the crimping shape. For example, the recess and protrusion may be located on the lower part of the rotor core instead of the upper part. For example, the recess and / or protrusion may be formed in a crimping shape different from the above. For example, as shown in FIGS. 9 and 10 , the shape of the recess 122h as viewed from the axial direction may be circular, and multiple steel plates 121p may be stacked in the axial direction, each having a protrusion 121c (a protrusion having a rectangular cross-section) corresponding to the recess 122h. For example, as shown in FIGS. 11 and 12 , the shape of the recess 222h as viewed from the axial direction may be rectangular (having two surfaces facing the side surfaces of the inverted V-shaped protrusion 221c from the axial outside), and multiple steel plates 221p may be stacked in the axial direction, each having a protrusion 221c (a protrusion having an inverted V-shape in cross-section) corresponding to the recess 222h. The shape of the recess and / or protrusion is not limited to the above and can be changed according to design specifications.

[0060] In the above-described embodiment, the rotating electric machine is mounted on an electric swing shovel, and an electric swing motor for swinging the upper swing body of the electric swing shovel has been described as an example, but the present invention is not limited to this. For example, the rotating electric machine may be mounted on other work machines such as a wheel loader, a bulldozer, or a dump truck. For example, the rotating electric machine may be configured as a drive motor for driving a work machine or a drive motor for driving a traveling device. The type of work machine on which the rotating electric machine is mounted and the object that the rotating electric machine drives can be changed depending on the design specifications.

[0061] In the above-described embodiment, the rotating electric machine is described as being vertically disposed so that the rotor shaft is parallel to the rotation axis, but this is not limiting. For example, the rotating electric machine may be horizontally disposed so that the rotor shaft is perpendicular to the rotation axis. For example, the rotating electric machine may be disposed at an angle so that the rotor shaft intersects the rotation axis at an angle. The arrangement of the rotating electric machine can be changed according to the design specifications.

[0062] In the above-described embodiment, the rotating electric machine is an inner rotor type rotating electric machine in which a stator is disposed outside a cylindrical rotor, but the present invention is not limited to this. For example, the rotating electric machine may be an outer rotor type rotating electric machine in which a stator is disposed inside a cup-shaped rotor. The type of rotating electric machine can be changed depending on the design specifications.

[0063] In the above-described embodiment, the rotating electric machine is described as a motor that drives and rotates a rotor by passing an alternating current through a stator coil, but the present invention is not limited to this. For example, the rotating electric machine may be a generator that generates electricity by rotating a rotor using power from an engine or the like. The configuration of the rotating electric machine can be changed according to design specifications.

[0064] Although one embodiment has been described above with reference to the drawings, the specific configuration is not limited to that described above, and additions, omissions, substitutions, and other modifications to the configuration are possible within the scope of the present disclosure, and the above-described embodiments can also be combined as appropriate.

[0065] 1... rotating electric machine, 2... rotor, 3... stator, 4... housing, 20... rotor shaft, 21... rotor core, 21c... convex portion, 21m... convex portion, 21p, 21p1, 21p2... steel plate, 22... upper plate (support plate), 22h... concave portion, 23... lower plate (support plate), 100... work machine, 114... swing motor, 120... traveling body, 140... upper swing body, 160... work machine, H1... minimum depth of concave portion, H2... maximum height of convex portion, TC... center position of thickness of support plate, W1... minimum width of concave portion, W2... maximum width of convex portion

Claims

1. A rotor comprising: a cylindrical rotor core formed by stacking a plurality of steel plates in the axial direction of a rotor shaft and having a protrusion protruding outward on at least one side in the axial direction; and a support plate disposed on the outer side of the rotor core in the axial direction and having a recess or through hole formed in a position corresponding to the protrusion.

2. The rotor according to claim 1, wherein the recess or the through hole is formed so as to surround the entire protrusion.

3. A rotor according to claim 1 or 2, wherein the innermost periphery of the recess or the through hole is positioned outside the outermost periphery of the protrusion.

4. The rotor according to claim 3, wherein the minimum width of the recess or the through hole in an in-plane direction perpendicular to the axial direction is 1.1 times or more the maximum width of the protrusion.

5. A rotor according to claim 1 or 2, wherein the recess is formed in the support plate, and the bottom surface of the recess is positioned more inward in the axial direction than the center position of the thickness of the support plate.

6. A rotor according to claim 5, wherein the minimum depth of the recess in the axial direction is 1.2 times or more the maximum height of the protrusion.

7. A rotor according to claim 1 or 2, wherein each of the plurality of steel plates has a convex portion that protrudes outward in the axial direction in a convex shape at a position corresponding to the convex portion.

8. A rotor according to claim 1 or 2, wherein a pair of support plates are provided to sandwich the rotor core from both outer sides in the axial direction, and the recess or the through hole is formed in one of the pair of support plates facing the protrusion, and is not formed in the other.

9. A rotor according to claim 1 or 2, wherein the plurality of steel plates are made of one type of steel plate with crimping protrusions, and the rotor core is made by stacking the plurality of steel plates with crimping protrusions in the axial direction.

10. A rotor according to claim 1 or 2, wherein a plurality of the protrusions are provided at intervals in the circumferential direction of the rotor core, and a plurality of the recesses or through holes are formed so as to correspond to each of the plurality of protrusions.

11. A rotating electric machine comprising: a rotor according to claim 1 or 2; a stator; and a housing that accommodates the rotor and the stator.

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

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