Rotating Electric Machine

Abstract

This rotating electric machine comprises a stator and a rotor. The rotor has a rotating shaft and a laminated steel sheet constituted by a plurality of magnetic steel sheets fixed to the rotating shaft. The laminated steel sheet has a first magnetic steel sheet to which a first magnet is fixed and a second magnetic steel sheet to which a second magnet is fixed. The first magnetic steel sheet has a first fixed positioning project and a first movable projection. The second magnetic steel sheet has a second fixed positioning projection and a second movable projection. The plurality of first magnets and the plurality of second magnets are alternately disposed in the circumferential direction.

Description

[Technical field]

[0001] The present disclosure relates to a rotating electric machine. [Background technology]

[0002] 2. Description of the Related Art Conventionally, in a rotating electric machine in which a rotor unit rotates inside a coil, a structure is known in which magnets are fixed by adhesive to the outer peripheral surface of a rotor made of electromagnetic steel plate. Patent Document 1 discloses a structure in which a magnet is pressed between a fixed positioning protrusion and a movable positioning protrusion, and the magnet is fixed with an adhesive. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent No. 4793677 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in such conventional rotating electric machines, the fixed positioning protrusion and the movable positioning protrusion must be spaced apart, which results in a larger space between adjacent magnets, which increases the size of the rotating electric machine, increases the number of areas with low magnetic force, and reduces drive efficiency.

[0005] The present disclosure has been made to solve the above-mentioned problems, and has an object to provide a rotating electric machine that improves drive efficiency. [Means for solving the problem]

[0006] A rotating electric machine according to the present disclosure includes a stator and a rotor. The rotor includes a rotating shaft, a laminated steel plate formed of a plurality of electromagnetic steel plates fixed to the rotating shaft and having an outer periphery, and a plurality of first magnets and a plurality of second magnets arranged alternately on the outer periphery in the circumferential direction. The rotor is spaced apart from the stator and surrounded by the stator. The laminated steel plate includes a first electromagnetic steel plate for fixing the plurality of first magnets, and a second electromagnetic steel plate for fixing the plurality of second magnets. The first electromagnetic steel plate includes a first fixed positioning protrusion that positions one end of the first magnet in the circumferential direction and protrudes toward the outside of the first electromagnetic steel plate, and a first movable protrusion that presses the other end of the first magnet in the circumferential direction toward the first fixed positioning protrusion and protrudes toward the outside of the first electromagnetic steel plate. The second electromagnetic steel plate has a second fixed positioning protrusion that positions one end of the second magnet in the circumferential direction and protrudes toward the outside of the second electromagnetic steel plate, and a second movable protrusion that presses the other end of the second magnet in the circumferential direction toward the second fixed positioning protrusion and protrudes toward the outside of the second electromagnetic steel plate. Effect of the Invention

[0007] According to the rotating electric machine according to the present disclosure, the driving efficiency can be improved. [Brief description of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view showing a rotating electric machine according to a first embodiment. [Diagram 2] FIG. 2 is a perspective view showing a rotor unit according to the first embodiment. [Diagram 3] FIG. 2 is a perspective view showing a rotor core according to the first embodiment. [Figure 4] FIG. 2 is a top view showing a rotor core according to the first embodiment. [Diagram 5] FIG. 2 is a front view showing a rotor core according to the first embodiment. [Figure 6] FIG. 2 is a partial exploded view showing a rotor core according to the first embodiment. [Figure 7]1 is a top view showing a non-protruding electromagnetic steel sheet according to embodiment 1. FIG. [Figure 8] FIG. 2 is a top view showing a first electromagnetic steel sheet according to the first embodiment. [Figure 9] FIG. 4 is a top view showing a second electromagnetic steel sheet according to the first embodiment. [Figure 10] 9 is a diagram showing a first electromagnetic steel sheet according to the first embodiment, and is an enlarged view showing a portion indicated by reference character A in FIG. 8. [Figure 11] 10 is a diagram showing a second electromagnetic steel sheet according to the first embodiment, and is an enlarged view showing a portion indicated by reference character B in FIG. 9. [Figure 12] FIG. 2 is a top view showing the magnet according to the first embodiment. [Figure 13] 2 is a perspective view showing the rotor core after magnets are attached in accordance with the first embodiment. FIG. [Figure 14A] FIG. 2 is a front view showing a rotor core according to a first modification of the first embodiment. [Figure 14B] FIG. 11 is a top view showing a rotor core according to a second modification of the first embodiment. [Figure 15] FIG. 11 is a perspective view showing a rotor core according to a second embodiment. [Figure 16] FIG. 11 is a top view showing a rotor core according to a second embodiment. [Figure 17] FIG. 11 is a front view showing a rotor core according to a second embodiment. [Figure 18] FIG. 11 is a partial exploded view showing a rotor core according to a second embodiment. [Figure 19] 17 is a diagram showing a rotor core according to a second embodiment, and is an enlarged view showing a portion indicated by reference symbol C in FIG. 16. FIG. [Figure 20] FIG. 11 is a top view showing a third electromagnetic steel sheet according to the second embodiment. [Figure 21] FIG. 11 is a top view showing a fourth electromagnetic steel sheet according to the second embodiment. [Figure 22] FIG. 11 is a perspective view showing a first electromagnetic steel sheet according to a modified example of the second embodiment. [Figure 23]FIG. 11 is a perspective view showing a rotor unit according to a third embodiment, illustrating a state before magnets are fixed to the rotor unit. [Figure 24] FIG. 11 is a perspective view showing a rotor unit according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] A rotating electric machine according to an embodiment will be described with reference to FIGS. 1 to 24, identical or similar components are denoted by the same reference numerals. The drawings are schematic or conceptual illustrations of the embodiments, and the relationship between the thickness and width of each part shown in the drawings, the size ratio between parts, and the like are not necessarily the same as those of the actual members. Configurations that are not related to the features of the present disclosure may be omitted from the illustration.

[0010] The rotating electric machine according to the first embodiment is applied to an electric power steering device mounted on a vehicle. The power steering device includes a control device that controls the rotating electric machine. The control device assists the steering force of the steering wheel of the vehicle. In Figs. 1 to 24, illustration of such a control device may be omitted.

[0011] In the drawings, an X direction, a Y direction, and a Z direction corresponding to a three-dimensional Cartesian coordinate system are shown (symbols X, Y, Z). The Z direction coincides with the axial direction of the rotating electric machine. The X direction and the Y direction intersect with the Z direction (e.g., are perpendicular to each other). The X direction and the Y direction intersect with each other (e.g., are perpendicular to each other). Furthermore, in the drawings, directions intersecting with the X direction and the Y direction may be shown. For example, a direction intersecting with the X direction is referred to as a first intersecting direction CR. A direction intersecting with the Y direction is referred to as a second intersecting direction CS. The angle between the first intersecting direction CR and the X direction is, for example, 45 degrees. The angle between the second intersecting direction CS and the Y direction is, for example, 45 degrees. The first intersecting direction CR and the second intersecting direction CS intersect with each other (for example, are perpendicular to each other).

[0012] The terms "circumferential direction", "radial direction", and "axial direction" used in the following description correspond to the terms "circumferential direction", "radial direction", and "axial direction" in a rotating electric machine, respectively. Furthermore, the term "radially outer" means a direction from the center of the stator toward the outside in the radial direction. The term "radially inner" means a direction from the outside of the stator toward the center in the radial direction.

[0013] The terms "front side" and "rear side" are sometimes used to explain the configuration of a rotating electric machine. The front side refers to the position where the members for mounting the rotating electric machine to a vehicle are located. The rear side is the opposite side to the front side. A control device is located on the rear side. For example, in FIG. 1, the symbol ZF (Z direction) refers to the front side. The symbol ZR (Z direction) refers to the rear side.

[0014] Embodiment 1 The rotating electric machine according to the first embodiment will be described with reference to FIGS. <Overall configuration of rotating electric machine 1> FIG. 1 is a cross-sectional view showing a rotating electric machine 1. As shown in FIG. The rotating electric machine 1 includes a frame 2, a stator 3, an insulator 4, a stator winding 5, a terminal 6, a bearing 7, a bearing holder 8, a bearing 9, a rotor unit 14, a joint 15, and a heat sink 16. A sensor 17 that detects the driving state of the rotating electric machine 1 and a control device 18 that controls the driving of the rotating electric machine 1 are connected to the rotating electric machine 1.

[0015] <Frame 2> The frame 2 is a housing that constitutes the rotating electric machine 1. The frame 2 is formed of, for example, an inexpensive and lightweight aluminum alloy. The frame 2 has a frame main body 2M and a base 2D. The frame main body 2M has an opening 2A and an inner wall surface 2B. The opening 2A is a portion located on the rear side of the frame 2. The area where the inner wall surface 2B is exposed, i.e., the space inside the frame main body 2M, is an inner area 2C in which multiple members that constitute the rotating electric machine 1 are arranged.

[0016] The shape of the frame body 2M is substantially cylindrical. The term "substantially cylindrical" refers to the overall shape of the frame body 2M, and does not necessarily mean a geometrically defined cylinder. The term "substantially cylindrical" refers to a cylindrical shape with chamfered corners, a shape including manufacturing errors, and a cylindrical shape that partially includes protrusions, recesses, steps, etc.

[0017] The base 2D is a portion provided on the front side of the frame 2. A screw hole is formed in the base 2D. A known fastening member such as a screw is inserted into the screw hole. The rotating electric machine 1 is fixed to the power steering device via the base 2D.

[0018] <Stator 3> The stator 3 is disposed in the inner region 2C and fixed to the frame 2. The stator 3 has a plurality of electromagnetic steel sheets. The plurality of electromagnetic steel sheets are, for example, stacked in the axial direction. At a radially outer position of the stator 3, the stator 3 has a stator outer surface 3A. At a radially inner position of the stator 3, the stator 3 has an inner stator surface 3B. In the axial direction, the stator 3 has a stator upper surface 3C and a stator lower surface 3D. The stator lower surface 3D is a surface located opposite to the stator upper surface 3C. The stator 3 may also be referred to as a stator core, for example.

[0019] With the stator 3 disposed in the inner region 2C, the stator outer surface 3A faces the inner wall surface 2B of the frame 2. The stator outer surface 3A and the inner wall surface 2B are in direct contact with each other. For example, a fixing member for fixing the stator 3 to the inner region 2C may be disposed between the stator outer surface 3A and the inner wall surface 2B. With the stator 3 disposed in the inner region 2C, the stator inner surface 3B faces the rotor unit 14.

[0020] <Insulator 4> The insulator 4 is made of a known insulating material, for example, a resin material. The insulator 4 is disposed on the stator 3 so as to cover a part of the stator upper surface 3C and a part of the stator lower surface 3D. The insulator 4 is disposed between the stator 3 and the stator winding 5. The insulator 4 electrically insulates the stator winding 5 from the stator 3.

[0021] <Stator winding 5> The stator winding 5 is a known wiring, for example, a copper wire covered with an insulating film such as a resin. A stator winding 5 is wound around the stator 3 such that an insulator 4 is interposed between the stator 3 and the stator winding 5 .

[0022] <Terminal 6> The terminal 6 is made of a known conductive metal material. The terminals 6 are electrically connected to the stator windings 5. The terminals 6 are electrically connected to a control device 18 disposed outside the rotating electric machine 1. The terminals 6 supply the power output from the control device 18 to the stator windings 5.

[0023] <Bearing 7, bearing holder 8, bearing 9> The bearings 7 and 9 are, for example, known ball bearings or roller bearings, etc. The bearing holder 8 is disposed on the rear side of the frame 2. In other words, it is located in the opening 2A of the frame 2.

[0024] The bearing 7 is disposed on the front side of the frame 2. In other words, the bearing 7 is disposed at a radially inner position on the base 2D of the frame 2, that is, on the axial direction. The bearing 9 is disposed on the rear side of the frame 2. In other words, the bearing 9 is disposed at a radially inner position in the bearing holder 8, that is, on the axial direction.

[0025] <Rotor unit 14> FIG. 2 is a perspective view showing the rotor unit 14. As shown in FIG. The rotor unit 14 is an example of a rotor. The rotor unit 14 has a rotating shaft 10, a rotor core 11, a plurality of magnets 12, and a protective tube 13. The rotor unit 14 is spaced apart from the stator 3 and is disposed so as to be surrounded by the stator 3.

[0026] The rotating shaft 10 is formed, for example, from a known metal material. The front side of the rotating shaft 10 is rotatably supported by a bearing 7. The rear side of the rotating shaft 10 is rotatably supported by a bearing 9. The rotating shaft 10 has a central region 10A located between the front side and the rear side. On the front side of the rotating shaft 10, the rotating shaft 10 has an end portion 10B located outside the bearing 7. On the rear side of the rotating shaft 10, the rotating shaft 10 has an end portion 10C located outside the bearing 9.

[0027] The rotor core 11 has a plurality of electromagnetic steel sheets. The electromagnetic steel sheets are formed of a known metal material. The plurality of electromagnetic steel sheets constituting the rotor core 11 are, for example, stacked in the axial direction. The rotor core 11 is fixed to a central region 10A of the rotating shaft 10. The rotor core 11 has an outer circumferential portion 11A located radially outward.

[0028] Each of the plurality of magnets 12 is made of a known magnetic material. The magnets 12 are bonded to the outer circumferential portion 11A of the rotor core 11. That is, the magnets 12 are fixed to the outer circumferential portion 11A of the rotor core 11.

[0029] The protective tube 13 is made of a known non-magnetic material such as stainless steel or aluminum. The protective tube 13 covers the radially outer portion of the rotor unit 14, including the multiple magnets 12. The protective tube 13 is provided on the outside of the magnets 12 fixed to the rotor core 11. The protective tube 13 is formed by, for example, deep drawing. Protective tube 13 is a member for preventing rotor unit 14 from stopping rotation when magnet 12 is cracked or comes off from rotor unit 14. Protective tube 13 is attached to rotor unit 14. Note that rotor unit 14 does not necessarily have to be equipped with protective tube 13, but in the first embodiment, a configuration in which rotor unit 14 is equipped with protective tube 13 is adopted.

[0030] <Joint 15> The joint 15 is disposed at an end 10B of the rotating shaft 10. The joint 15 is a member that is attached to the end portion 10B of the rotating shaft 10 and the rotating shaft of the vehicle. The joint 15 is made of, for example, a known metal material having strength.

[0031] <Heat sink 16> The heat sink 16 is disposed on the rear side of the frame 2. In other words, the heat sink 16 is disposed at an open end located outside the bearing holder 8 in the opening 2A of the frame 2. The heat sink 16 is formed of a known metal material having excellent thermal conductivity. A control device (not shown) is installed in the heat sink 16.

[0032] <Sensor 17> A sensor 17 is provided at an end 10C of the rotating shaft 10. The sensor 17 detects the rotation state of the rotor core 11. The sensor 17 is, for example, a known rotation angle detection sensor.

[0033] <Control device 18> The control device 18 has a power conversion circuit and a control circuit. The power conversion circuit is, for example, a power conversion circuit having a power semiconductor. The power conversion circuit converts a direct current supplied from outside the control device 18 into an alternating current. The control device 18 controls the amount of current supplied to the stator windings 5 ​​via the terminals 6.

[0034] In the rotating electric machine 1 having the above-described structure, a rotational force is generated in the rotor core 11 according to the amount of electric power supplied to the rotating electric machine 1. When the rotor unit 14 rotates, the joint 15 rotates, and the rotating shaft of the vehicle rotates.

[0035] <Detailed structure of rotor unit 14> Next, the configuration of the rotor unit 14 according to the first embodiment will be described in detail. FIG. 3 is a perspective view showing the rotor core 11. FIG. 4 is a top view showing the rotor core 11. FIG. 5 is a front view showing the rotor core 11. FIG. 6 is a partially exploded view showing the rotor core 11. FIG. 7 is a top view showing the non-protruding electromagnetic steel sheet 110. FIG. 8 is a top view showing the first electromagnetic steel sheet 111. FIG. 9 is a top view showing the second electromagnetic steel sheet 112. FIG. 10 is a view showing the first electromagnetic steel sheet 111, and is an enlarged view showing a portion indicated by reference character A in FIG. 8. FIG. 11 is a view showing the second electromagnetic steel sheet 112, and is an enlarged view showing a portion indicated by reference character B in FIG. 9. FIG. 12 is a top view showing the magnet 12. FIG. 13 is a perspective view showing a state after the magnet 12 has been attached to the rotor core 11.

[0036] The rotor unit 14 is composed of a plurality of electromagnetic steel plates fixed to the rotating shaft 10. The rotor unit 14 has laminated steel plates having an outer circumferential portion 11A. The rotor unit 14 has a plurality of magnets 12 arranged in the circumferential direction on the outer circumferential portion 11A. The rotor unit 14 is spaced apart from the stator 3 and is surrounded by the stator 3.

[0037] The rotor core 11 is an example of a laminated steel plate in which a plurality of electromagnetic steel plates are laminated in the Z direction. The outer shape of the rotor core 11 is, for example, a substantially regular octagonal prism shape. The substantially regular octagonal prism shape refers to the overall shape of the rotor core 11, and does not necessarily mean only a geometrically defined regular octagonal prism. The substantially regular octagonal prism shape refers to a regular octagonal prism shape with chamfered corners, a shape including manufacturing errors, a convex portion protruding radially outward, a concave portion recessed radially inward, a step, and the like.

[0038] The rotor core 11 has eight outer circumferential surfaces 11a at radially outer positions. Each of the eight outer peripheral surfaces 11a is a region in which the magnet 12 is disposed. The eight outer peripheral surfaces 11a arranged clockwise in the circumferential direction may be referred to as the first arrangement region R1, the second arrangement region R2, the third arrangement region R3, the fourth arrangement region R4, the fifth arrangement region R5, the sixth arrangement region R6, the seventh arrangement region R7, and the eighth arrangement region R8, in that order. The outer peripheral surface 11a corresponds to the outer peripheral portion 11A.

[0039] The rotor core 11 has one first through hole 11b at a radially inner position. In other words, the first through hole 11b is provided in the center of the rotor core 11. The first through hole 11b is a portion into which the rotating shaft 10 is inserted. The first through hole 11b has an engagement recess 11c. The engagement recess 11c is a portion where the rotor core 11 and the central region 10A of the rotating shaft 10 engage with each other when the rotating shaft 10 is inserted into the rotor core 11.

[0040] The rotor core 11 has a plurality of second through holes 11d formed between the outer peripheral surface 11a and the first through holes 11b. The plurality of second through holes 11d are formed at equal intervals in the circumferential direction. In the first embodiment, the number of the plurality of second through holes 11d is five. The number of the second through holes 11d is not limited to five. For example, the number of the second through holes 11d can be appropriately changed depending on the design of the rotating electric machine 1, such as the strength and weight of the rotor core 11, and the driving force generated by the rotating electric machine 1.

[0041] In the first embodiment, the number N of the multiple electromagnetic steel plates constituting the rotor core 11 is 47. The number N of the electromagnetic steel plates is not limited to 47. For example, the number N of the electromagnetic steel plates can be changed as appropriate depending on the design of the rotating electric machine 1, such as the size in the Z direction of the rotor core 11, its weight, and the driving force generated by the rotating electric machine 1.

[0042] In the following description, the electromagnetic steel sheet arranged closest to the front side among the multiple electromagnetic steel sheets may be referred to as the first electromagnetic steel sheet N1. Also, the electromagnetic steel sheet arranged closest to the rear side among the multiple electromagnetic steel sheets may be referred to as the 47th electromagnetic steel sheet N47. In the direction from the front side to the rear side, the electromagnetic steel sheets arranged between the first electromagnetic steel sheet N1 and the 47th electromagnetic steel sheet N47 may be referred to as the second electromagnetic steel sheet N2, the third electromagnetic steel sheet N3, the fourth electromagnetic steel sheet N4,... the 44th electromagnetic steel sheet N44, the 45th electromagnetic steel sheet N45, and the 46th electromagnetic steel sheet N46, in that order. The laminated steel plates of the rotor unit 14 are formed by the first electromagnetic steel plate N1 to the 47th electromagnetic steel plate N47.

[0043] Next, the configuration of each of the plurality of electromagnetic steel sheets that make up rotor core 11 will be described. The rotor core 11 has a non-protruding electromagnetic steel sheet 110 , a first electromagnetic steel sheet 111 , and a second electromagnetic steel sheet 112 . The non-protruding electromagnetic steel sheet 110, the first electromagnetic steel sheet 111, and the second electromagnetic steel sheet 112 each have a substantially regular octagonal shape when viewed in the Z direction.

[0044] The term "approximately regular octagon" does not necessarily mean only a geometrically defined regular octagon, but also means an approximately regular octagon having chamfered corners, a shape including manufacturing errors, a convex portion protruding radially outward, a concave portion recessed radially inward, a step, or the like.

[0045] Each of the plurality of electromagnetic steel plates has an outer circumferential surface 11a, a first through hole 11b, an engagement recess 11c, and a plurality of second through holes 11d, similar to the configuration of the rotor core 11. For this reason, in the following description, the description of the above-mentioned parts described in the rotor core 11 may be omitted.

[0046] <Non-protrusion electrical steel sheet 110> As shown in FIG. 5, the first electromagnetic steel sheet N1, the second electromagnetic steel sheet N2, the fifth electromagnetic steel sheet N5 to the forty-third electromagnetic steel sheet N43, the forty-sixth electromagnetic steel sheet N46, and the forty-seventh electromagnetic steel sheet N47 are non-protruding electromagnetic steel sheets 110.

[0047] As shown in FIG. 7, the non-protrusion electromagnetic steel sheet 110 is an electromagnetic steel sheet different from the first electromagnetic steel sheet 111 and the second electromagnetic steel sheet 112, and is an electromagnetic steel sheet that does not have protrusions. The non-protruding electromagnetic steel sheet 110 has eight outer peripheral corners 110C and eight straight portions 110L. The non-protruding electromagnetic steel sheet 110 has eight recesses 110a provided in one-to-one correspondence with the eight outer peripheral corners 110C. The recesses 110a are located at the corners of a regular octagon.

[0048] The shape of the recess 110a is, for example, a semicircular shape. The semicircular shape is not limited to the shape shown in FIG. 7. The depth of the recess 110a recessed radially inward is adjustable. The shape of the recess 110a is not limited to a semicircular shape having a curvature. The recess 110a may have a corner portion or a straight portion extending in a straight line. The shape of the recess 110a may be a shape that combines at least two portions of a curved surface portion having a curvature, a corner portion, and a straight portion. The shape of the recess 110a may be, for example, a substantially U-shaped shape.

[0049] The non-protruding electromagnetic steel sheet 110 is one of a plurality of electromagnetic steel sheets that make up the rotor core 11. Therefore, the non-protruding electromagnetic steel sheet 110 has a first arrangement region R1, a second arrangement region R2, a third arrangement region R3, a fourth arrangement region R4, a fifth arrangement region R5, a sixth arrangement region R6, a seventh arrangement region R7, and an eighth arrangement region R8.

[0050] <1st electromagnetic steel plate 111> 5, the fourth electromagnetic steel sheet N4 and the 44th electromagnetic steel sheet N44 are first electromagnetic steel sheets 111. In other words, the first electromagnetic steel sheets 111 are arranged in the rear region 11R and the front region 11F of the rotor core 11 in the axial direction. The rear region 11R is an example of the first region. The front region 11F is an example of the second region.

[0051] As shown in FIG. 8, the first electromagnetic steel sheet 111 has eight outer peripheral corners 111C and eight straight portions 111L. The first electromagnetic steel sheet 111 has fixed positioning protrusions 111a provided to correspond one-to-one to four of the eight outer peripheral corners 111C, and movable protrusions 111b provided to correspond one-to-one to the remaining four outer peripheral corners 111C. That is, the first electromagnetic steel sheet 111 is integrally provided with four fixed positioning protrusions 111a and four movable protrusions 111b. The first electromagnetic steel sheet 111 is an electromagnetic steel sheet that fixes the first magnet 12, which is one of the multiple magnets 12. In the following description, the first magnet 12 will be simply referred to as the magnet 12.

[0052] In other words, the first electromagnetic steel sheet 111 has a first fixed positioning protrusion 111a and a first movable protrusion 111b. The first fixed positioning protrusion 111a positions one end of the first magnet 12 in the circumferential direction and protrudes toward the outside of the first electromagnetic steel sheet 111. The first movable protrusion 111b presses the other end of the first magnet 12 in the circumferential direction toward the first fixed positioning protrusion 111a and protrudes toward the outside of the first electromagnetic steel sheet 111. In the following description, the first fixed positioning protrusion 111a will be simply referred to as the fixed positioning protrusion 111a, and the first movable protrusion 111b will be simply referred to as the movable protrusion 111b.

[0053] The four fixed positioning protrusions 111a are provided at 90 degree intervals in the circumferential direction on the first electromagnetic steel sheet 111. Two fixed positioning protrusions 111a provided on opposite sides in the radial direction constitute a set of fixed positioning protrusions. In other words, the first electromagnetic steel sheet 111 has two sets of fixed positioning protrusions.

[0054] The four movable protrusions 111b are provided at 90 degree intervals in the circumferential direction on the first electromagnetic steel sheet 111. Two movable protrusions 111b provided on opposite sides in the radial direction constitute a pair of movable protrusions. In other words, the first electromagnetic steel sheet 111 has two pairs of movable protrusions.

[0055] The first electromagnetic steel sheet 111 is one of a plurality of electromagnetic steel sheets that constitute the rotor core 11. Therefore, the first electromagnetic steel sheet 111 has a first arrangement region R1, a second arrangement region R2, a third arrangement region R3, a fourth arrangement region R4, a fifth arrangement region R5, a sixth arrangement region R6, a seventh arrangement region R7, and an eighth arrangement region R8.

[0056] <Movable protrusion 111b> 10, the movable protrusion 111b extends in the Y direction. The first electromagnetic steel sheet 111 has two recesses 111p and 111q provided on both sides of the movable protrusion 111b in the X direction. Of the two recesses 111p, 111q, the recess provided between the movable protrusion 111b and the linear portion 111L extending in the X direction is a first movable orthogonal recess 111q. Of the two recesses 111p, 111q, the recess provided between the movable protrusion 111b and the straight portion 111L extending in the first cross direction CR is the first movable oblique recess 111p.

[0057] Each of the first movable perpendicular recess 111q and the first movable oblique recess 111p is a cutout portion formed in the first electromagnetic steel sheet 111 extending parallel to the Y direction. The first movable perpendicular recess 111q has a bottom portion 111s located at an end of the first movable perpendicular recess 111q. The first movable oblique recess 111p has a bottom portion 111r located at an end of the first movable oblique recess 111p.

[0058] The movable protrusion 111b has an introduction taper portion 111c provided on the tip side of the movable protrusion 111b. The introduction taper portion 111c faces the fixed positioning protrusion 111a. The introduction taper portion 111c is a protrusion that protrudes from the tip of the movable protrusion 111b toward the fixed positioning protrusion 111a in the X direction. When the magnet 12 is attached to the outer circumferential portion 11A of the rotor core 11, the magnet 12 is inserted between the movable protrusion 111b and the fixed positioning protrusion 111a while contacting the introduction taper portion 111c.

[0059] The distance between the top and bottom 111r of the introduction taper portion 111c in the Y direction, i.e., the distance between the top and bottom 111s of the introduction taper portion 111c in the Y direction, is the free end length L1. The free end length L1 is set in consideration of the amount or range of movement in the circumferential direction when the movable protrusion 111b elastically deforms and the elastic restoring force of the movable protrusion 111b.

[0060] The movable protrusion 111b has a movable extension surface 111bx facing the first movable oblique recess 111p. The distance between the top of the introduction taper portion 111c and the movable extension surface 111bx is the width W1 of the movable protrusion 111b. The width W1 is set in consideration of the workability of the movable protrusion 111b. The width W1 is set so that the gap between the magnet 12 adjacent to the movable protrusion 111b and the movable protrusion 111b is not large. In the first embodiment, the width W1 is the same as the width W2 of the fixed positioning protrusion 111a.

[0061] <Fixed positioning protrusion 111a> The fixed positioning protrusion 111a extends in the Y direction. The first electromagnetic steel sheet 111 has a first fixed extending recess 111t provided adjacent to the fixed positioning protrusion 111a in the X direction. The first fixed extending recess 111t is provided between the fixed positioning protrusion 111a and the straight portion 111L extending in the X direction.

[0062] The first fixed extending recess 111t is a cutout portion formed in the first electromagnetic steel sheet 111 extending parallel to the Y direction. The first fixed extending recess 111t has a bottom portion 111u located at an end portion of the first fixed extending recess 111t.

[0063] The fixed positioning protrusion 111a has a tip 111af, an inclined end 111as, an inclined portion 111ak, and a fixed extending surface 111at. The tip 111af is the tip located at the outermost side of the fixed positioning protrusion 111a in the Y direction. The inclined portion 111ak is a surface extending from the tip 111af to the inclined end 111as in a direction inclined with respect to the Y direction. The fixed extending surface 111at is a surface located on the opposite side to the position where the first fixed extending recess 111t is formed in the fixed positioning protrusion 111a. One end of the inclined portion 111ak is the tip 111af, and the other end of the inclined portion 111ak is the inclined end 111as. In other words, the inclined portion 111ak is formed between the tip 111af and the inclined end 111as. The inclined end 111as is formed between the inclined portion 111ak and the fixed extending surface 111at.

[0064] The distance between the inclined end 111as and the bottom 111u in the Y direction is a free end length L2. The free end length L2 of the fixed positioning protrusion 111a is shorter than the free end length L1 of the movable protrusion 111b. Therefore, even if a force is applied to the fixed positioning protrusion 111a from the outside of the first electromagnetic steel sheet 111, the fixed positioning protrusion 111a is hardly deformed. In other words, since the free end length L1 is greater than the free end length L2, the amount of elastic deformation of the movable protrusion 111b in the circumferential direction is greater than that of the fixed positioning protrusion 111a. The width of the fixed positioning protrusion 111a in the X direction is width W2, which is the same as width W1 of the movable protrusion 111b.

[0065] The structure of the movable protrusion 111b and the fixed positioning protrusion 111a shown in FIG. 10 is applied to the first arrangement region R1, the third arrangement region R3, the fifth arrangement region R5, and the seventh arrangement region R7.

[0066] <Second electromagnetic steel plate 112> 5, the third electromagnetic steel sheet N3 and the 45th electromagnetic steel sheet N45 are second electromagnetic steel sheets 112. In other words, the second electromagnetic steel sheets 112 are arranged in the rear region 11R and the front region 11F of the rotor core 11 in the axial direction. As shown in FIG. 9, the second electromagnetic steel sheet 112 has eight outer peripheral corners 112C and eight straight portions 112L. The second electromagnetic steel sheet 112 has fixed positioning protrusions 112a provided to correspond one-to-one with four of the eight outer peripheral corners 112C, and movable protrusions 112b provided to correspond one-to-one with the remaining four outer peripheral corners 112C. That is, the second electromagnetic steel sheet 112 is integrally provided with four fixed positioning protrusions 112a and four movable protrusions 112b. The second electromagnetic steel sheet 112 is an electromagnetic steel sheet that is adjacent to the first magnet 12 in the circumferential direction and fixes the second magnet 12, which is one of the multiple magnets 12. In the following description, the second magnet 12 will be simply referred to as the magnet 12.

[0067] In other words, the second electromagnetic steel sheet 112 has a second fixed positioning protrusion 112a and a second movable protrusion 112b. The second fixed positioning protrusion 112a positions one end of the second magnet 12 in the circumferential direction and protrudes toward the outside of the second electromagnetic steel sheet 112. The second movable protrusion 112b presses the other end of the second magnet 12 in the circumferential direction toward the second fixed positioning protrusion 112a and protrudes toward the outside of the second electromagnetic steel sheet 112. In the following description, the second fixed positioning protrusion 112a will be simply referred to as the fixed positioning protrusion 112a, and the second movable protrusion 112b will be simply referred to as the movable protrusion 112b.

[0068] The four fixed positioning protrusions 112a are provided at 90 degree intervals in the circumferential direction on the second electromagnetic steel sheet 112. Two fixed positioning protrusions 112a provided on opposite sides in the radial direction constitute a set of fixed positioning protrusions. In other words, the second electromagnetic steel sheet 112 has two sets of fixed positioning protrusions.

[0069] The four movable protrusions 112b are provided at 90 degree intervals in the circumferential direction on the second electromagnetic steel sheet 112. Two movable protrusions 112b provided on opposite sides in the radial direction constitute a pair of movable protrusions. In other words, the second electromagnetic steel sheet 112 has two pairs of movable protrusions.

[0070] The second electromagnetic steel sheet 112 is one of a plurality of electromagnetic steel sheets that constitute the rotor core 11. Therefore, the second electromagnetic steel sheet 112 has a first arrangement region R1, a second arrangement region R2, a third arrangement region R3, a fourth arrangement region R4, a fifth arrangement region R5, a sixth arrangement region R6, a seventh arrangement region R7, and an eighth arrangement region R8.

[0071] <Movable protrusion 112b> 11, the movable protrusion 112b extends in a first intersecting direction CR. The second electromagnetic steel sheet 112 has two recesses 112p, 112q provided on both sides of the movable protrusion 112b in the second intersecting direction CS. Of the two recesses 112p, 112q, the recess provided between the movable protrusion 112b and the straight portion 112L extending in the second cross direction CS is a second movable orthogonal recess 112q. Of the two recesses 112p, 112q, the recess provided between the movable protrusion 112b and the straight portion 112L extending in the X direction is a second movable oblique recess 112p.

[0072] Each of the second movable orthogonal recess 112q and the second movable oblique recess 112p is a cutout portion formed in the second electromagnetic steel sheet 112 extending parallel to the first cross direction CR. The second movable orthogonal recess 112q has a bottom portion 112s located at an end of the second movable orthogonal recess 112q. The second movable oblique recess 112p has a bottom portion 112r located at an end of the second movable oblique recess 112p.

[0073] The movable protrusion 112b has an introduction taper portion 112c provided on the tip side of the movable protrusion 112b. The introduction taper portion 112c faces the fixed positioning protrusion 112a. The introduction taper portion 112c is a protrusion that protrudes from the tip of the movable protrusion 112b toward the fixed positioning protrusion 112a in the second intersecting direction CS. When attaching the magnet 12 to the outer circumferential portion 11A of the rotor core 11, the magnet 12 is inserted between the movable protrusion 112b and the fixed positioning protrusion 112a while contacting the introduction taper portion 112c.

[0074] The distance between the top and bottom 112r of the introduction taper portion 112c in the first intersecting direction CR, i.e., the distance between the top and bottom 112s of the introduction taper portion 112c in the first intersecting direction CR, is the free end length L1. The free end length L1 is set in consideration of the amount or range of movement in the circumferential direction when the movable protrusion 112b elastically deforms and the elastic restoring force of the movable protrusion 112b.

[0075] The movable protrusion 112b has a movable extension surface 112bx facing the second movable oblique recess 112p. The distance between the top of the introduction taper portion 112c and the movable extension surface 112bx is the width W1 of the movable protrusion 112b. The width W1 is set in consideration of the workability of the movable protrusion 112b. The width W1 is set so that the gap between the magnet 12 adjacent to the movable protrusion 112b and the movable protrusion 112b is not large. In the first embodiment, the width W1 is the same as the width W2 of the fixed positioning protrusion 112a.

[0076] <Fixed positioning protrusion 112a> The fixed positioning protrusion 112a extends in the first transverse direction CR. The second electromagnetic steel sheet 112 has a second fixed extending recess 112t provided adjacent to the fixed positioning protrusion 112a in the second transverse direction CS. The second fixed extending recess 112t is provided between the fixed positioning protrusion 112a and a straight portion 112L extending in the second transverse direction CS.

[0077] The second fixed extending recess 112t is a cutout portion extending parallel to the first cross direction CR and formed in the second electromagnetic steel sheet 112. The second fixed extending recess 112t has a bottom portion 112u located at an end portion of the second fixed extending recess 112t.

[0078] The fixed positioning protrusion 112a has a tip 112af, an inclined end 112as, an inclined portion 112ak, and a fixed extending surface 112at. The tip 112af is the tip located at the outermost side of the fixed positioning protrusion 112a in the first intersecting direction CR. The inclined portion 112ak is a surface extending from the tip 112af to the inclined end 112as in a direction inclined with respect to the first intersecting direction CR. The fixed extending surface 112at is a surface located on the opposite side of the position where the second fixed extending recess 112t is formed in the fixed positioning protrusion 112a. One end of the inclined portion 112ak is the tip 112af, and the other end of the inclined portion 112ak is the inclined end 112as. In other words, the inclined portion 112ak is formed between the tip 112af and the inclined end 112as. The inclined end 112as is formed between the inclined portion 112ak and the fixed extending surface 112at.

[0079] The distance between the inclined end 112as and the bottom 112u in the first cross direction CR is a free end length L2. The free end length L2 of the fixed positioning protrusion 112a is shorter than the free end length L1 of the movable protrusion 112b. Therefore, even if a force is applied to the fixed positioning protrusion 112a from the outside of the second electromagnetic steel sheet 112, the fixed positioning protrusion 112a is hardly deformed. In other words, since the free end length L1 is greater than the free end length L2, the amount of elastic deformation of the movable protrusion 112b in the circumferential direction is greater than that of the fixed positioning protrusion 112a. The distance of the fixed positioning protrusions 112a in the second cross direction CS is a width W2, which is the same as the width W1 of the movable protrusions 112b.

[0080] The structure of the movable protrusion 112b and the fixed positioning protrusion 112a shown in FIG. 11 is applied to the second arrangement region R2, the fourth arrangement region R4, the sixth arrangement region R6, and the eighth arrangement region R8.

[0081] 3 and 4 , in a configuration in which multiple electromagnetic steel sheets are stacked in the Z direction, a portion of the fixed positioning protrusion 111a of the first electromagnetic steel sheet 111 overlaps a portion of the movable protrusion 112b of the second electromagnetic steel sheet 112. Similarly, a portion of the fixed positioning protrusion 112a of the second electromagnetic steel sheet 112 overlaps a portion of the movable protrusion 111b of the first electromagnetic steel sheet 111.

[0082] <Laminated protrusions composed of fixed positioning protrusions and movable protrusions> As shown in Fig. 4, in a plan view, the rotor core 11 has a first laminated protrusion in which the movable protrusion 111b and the fixed positioning protrusion 112a are overlapped, and a second laminated protrusion in which the fixed positioning protrusion 111a and the movable protrusion 112b are overlapped. The first laminated protrusion and the second laminated protrusion are located symmetrically with respect to the center line CL1. Such symmetry of the first laminated protrusion and the second laminated protrusion is applied to the first arrangement region R1, the third arrangement region R3, the fifth arrangement region R5, and the seventh arrangement region R7.

[0083] Similarly, in the second arrangement region R2, the fourth arrangement region R4, the sixth arrangement region R6, and the eighth arrangement region R8, the rotor core 11 has a first laminated protrusion in which the movable protrusion 111b and the fixed positioning protrusion 112a are overlapped, and a second laminated protrusion in which the fixed positioning protrusion 111a and the movable protrusion 112b are overlapped. The first laminated protrusion and the second laminated protrusion are located symmetrically with respect to the center line CL2.

[0084] <Magnet 12> The magnet 12 is a Nd-Fe-B sintered magnet. The surface of the magnet 12 is coated with an anti-rust coating such as plating. The magnet 12 has one cylindrical surface 12a extending in the Z direction, a flat surface 12b located opposite the cylindrical surface 12a, and two side surfaces 12c and 12d.

[0085] For example, as shown in FIG. 12, when the plane 12b is parallel to the X direction, the side surface 12c of the magnet 12 is located at one end in the X direction, and the side surface 12d of the magnet 12 is located at the other end in the X direction. In this case, the cylindrical surface 12a has a shape that bulges toward the Y direction. The shape of the magnet 12 is such that the cylindrical surface 12a has a shape that corresponds to a part of a curved surface of a semi-cylinder. In other words, the cylindrical surface 12a has a shape that corresponds to a part of a curved surface of a half-moon. The multiple magnets 12 are arranged along the circumferential direction.

[0086] The distance between the two side surfaces 12c, 12d is designed to be slightly larger than the distance between the fixed positioning protrusion 111a and the movable protrusion 111b and the distance between the fixed positioning protrusion 112a and the movable protrusion 112b.

[0087] 13, the magnets 12 are arranged in a first arrangement region R1, a second arrangement region R2, a third arrangement region R3, a fourth arrangement region R4, a fifth arrangement region R5, a sixth arrangement region R6, a seventh arrangement region R7, and an eighth arrangement region R8. In other words, the first magnets and the second magnets are arranged alternately in the circumferential direction.

[0088] In the first arrangement region R1, the third arrangement region R3, the fifth arrangement region R5, and the seventh arrangement region R7, the magnet 12 is located and fixed between the movable protrusion 111b and the fixed positioning protrusion 111a. In such a fixed state, an elastic restoring force is generated in the movable protrusion 111b, and the magnet 12 is fixed between the movable protrusion 111b and the fixed positioning protrusion 111a by this elastic restoring force. The magnet 12 is fixed in this manner by the first electromagnetic steel sheet 111, which corresponds to the fourth electromagnetic steel sheet N4 and the 44th electromagnetic steel sheet N44 shown in FIG. 5. In other words, in each of the first arrangement region R1, the third arrangement region R3, the fifth arrangement region R5, and the seventh arrangement region R7, the magnet 12 is fixed at two points in the axial direction, that is, the front side and the rear side.

[0089] In the second arrangement region R2, the fourth arrangement region R4, the sixth arrangement region R6, and the eighth arrangement region R8, the magnet 12 is located and fixed between the movable protrusion 112b and the fixed positioning protrusion 112a. In such a fixed state, an elastic restoring force is generated in the movable protrusion 112b, and the magnet 12 is fixed between the movable protrusion 112b and the fixed positioning protrusion 112a by this elastic restoring force. The magnet 12 is fixed in this manner by the second electromagnetic steel sheet 112, which corresponds to the third electromagnetic steel sheet N3 and the 45th electromagnetic steel sheet N45 shown in FIG. 5. In other words, in each of the second arrangement region R2, the fourth arrangement region R4, the sixth arrangement region R6, and the eighth arrangement region R8, the magnet 12 is fixed at two points on the front side and the rear side.

[0090] <Assembly method of rotor unit 14> Next, a method of assembling the rotor unit 14 will be described. As will be described later, the method of assembling the rotor unit 14 includes a step of applying an adhesive, a step of attaching magnets, a step of hardening the adhesive, a step of attaching a protective tube, and a step of press-fitting the rotating shaft.

[0091] <Adhesive application process> The adhesive application step is carried out before the magnets 12 are attached to the rotor core 11. First, an adhesive is applied to the outer circumferential surface 11a of the rotor core 11. The adhesive is, for example, a thermosetting silicone adhesive or a two-part curing acrylic adhesive. Before the adhesive hardens, the next adhesive application step is carried out.

[0092] <Magnet installation process> First, the attachment of the magnet by the movable protrusion 111b and the fixed positioning protrusion 111a will be described. The magnet 12 is pressed against the outer circumferential surface 11a from the outside of the rotor core 11, and the magnet 12 is inserted between the movable protrusion 111b and the fixed positioning protrusion 111a. At this time, the magnet 12 contacts the leading tapered portion 111c formed on the movable protrusion 111b, and while the movable protrusion 111b elastically deforms, the magnet 12 is inserted and fixed between the movable protrusion 111b and the fixed positioning protrusion 111a.

[0093] In such a fixed state, the magnet 12 is in close contact with the outer circumferential surface 11a of the rotor core 11, and is pressed against the fixed positioning protrusion 111a by the elastic restoring force of the movable protrusion 111b. This operation is performed in the first arrangement region R1, the third arrangement region R3, the fifth arrangement region R5, and the seventh arrangement region R7, and in the fourth electromagnetic steel sheet N4 and the forty-fourth electromagnetic steel sheet N44.

[0094] Next, the attachment of the magnet by the movable protrusion 112b and the fixed positioning protrusion 112a will be described. The magnet 12 is pressed against the outer circumferential surface 11a from the outside of the rotor core 11, and the magnet 12 is inserted between the movable protrusion 112b and the fixed positioning protrusion 112a. At this time, the magnet 12 contacts the leading tapered portion 112c formed on the movable protrusion 112b, and while the movable protrusion 112b elastically deforms, the magnet 12 is inserted and fixed between the movable protrusion 112b and the fixed positioning protrusion 112a.

[0095] In such a fixed state, the magnet 12 is in close contact with the outer circumferential surface 11a of the rotor core 11, and the magnet 12 is pressed against the fixed positioning protrusion 112a by the elastic restoring force of the movable protrusion 112b. This operation is performed on the third electromagnetic steel sheet N3 and the forty-fifth electromagnetic steel sheet N45 in the second arrangement region R2, the fourth arrangement region R4, the sixth arrangement region R6, and the eighth arrangement region R8. As a result, the positions of the magnets 12 on the eight outer circumferential surfaces 11a of the rotor core 11 are maintained.

[0096] <Adhesive curing process> Next, the adhesive is hardened, whereby the magnets 12 are fixed to the eight outer circumferential surfaces 11a of the rotor core 11 with high precision.

[0097] <Protective tube installation process> The protective tube 13 is formed by deep drawing on the outside of the magnet 12 fixed to the rotor core 11. Specifically, the protective tube 13 is fixed so that the magnet 12 is press-fitted into the inside of the protective tube 13. Then, the end faces of the protective tube 13 are bent. As a result, the protective tube 13 comes into contact with and is fixed to the front and rear sides of the rotor core 11.

[0098] <Rotating shaft press-fitting process> Finally, the rotating shaft 10 is press-fitted into the first through hole 11b of the rotor core 11. In this way, the rotor unit 14 is completed. In the above-described method of assembling rotor unit 14, magnets 12 are fixed to rotor core 11, and then rotating shaft 10 is press-fitted and fixed. The first embodiment is not limited to such a process. After rotating shaft 10 is press-fitted and fixed to rotor core 11, the above-described adhesive application process, magnet attachment process, adhesive curing process, and protective tube attachment process may be performed.

[0099] <Advantages of the First Embodiment> According to the first embodiment, each of the multiple magnets is fixed by a first electromagnetic steel sheet 111 and a second electromagnetic steel sheet 112. That is, adjacent magnets 12 are fixed by separate electromagnetic steel sheets. Therefore, unlike conventional rotating electric machines, it is not necessary to arrange fixed positioning protrusions and movable protrusions side by side between adjacent magnets. That is, the intervals between magnets 12 can be narrowed, and a rotating electric machine 1 that is small in size and has high drive efficiency can be provided.

[0100] Furthermore, a portion of the fixed positioning protrusion 111a of the first electromagnetic steel sheet 111 overlaps a portion of the movable protrusion 112b of the second electromagnetic steel sheet 112. Similarly, a portion of the fixed positioning protrusion 112a of the second electromagnetic steel sheet 112 overlaps a portion of the movable protrusion 111b of the first electromagnetic steel sheet 111. This makes it possible to narrow the circumferential gap between two adjacent magnets among the plurality of magnets 12. It is possible to realize a small rotating electric machine 1 with high drive efficiency that effectively uses magnetic force.

[0101] Furthermore, since the first electromagnetic steel sheet 111 and the second electromagnetic steel sheet 112 are respectively arranged on the front and rear sides in the Z direction of the rotor core 11, the magnet 12 does not tilt in the axial direction, and the magnet 12 can be arranged with greater precision.

[0102] Furthermore, in conventional rotating electric machines, fixed positioning protrusions and movable positioning protrusions are arranged on the left and right sides of the magnet, but the shapes of the fixed positioning protrusions and the movable positioning protrusions are different from each other. In this case, the distribution of the magnetic flux density of the magnetic force generated at the left end of the magnet becomes unbalanced with the distribution of the magnetic flux density of the magnetic force generated at the right end of the magnet. This unbalance in the distribution of magnetic flux density causes a problem of deterioration of motor characteristics such as cogging torque.

[0103] In contrast to such conventional rotating electric machines, in the rotor core 11 of embodiment 1, a first laminated protrusion in which the movable protrusion 111b and the fixed positioning protrusion 112a are overlapped, and a second laminated protrusion in which the fixed positioning protrusion 111a and the movable protrusion 112b are overlapped are arranged symmetrically with respect to the center lines CL1 and CL2. As a result, a well-balanced magnetic force is generated at each of the left and right ends of magnet 12, and a well-balanced distribution of magnetic flux density can be obtained at each of the left and right ends of magnet 12. Therefore, there is no imbalance in the distribution of magnetic flux density as occurs in conventional rotating electrical machines, and good motor characteristics can be obtained.

[0104] Moreover, the width W1 of the movable protrusion 111b is greater than the width W2 of the fixed positioning protrusion 111a. The width W1 of the movable protrusion 112b is greater than the width W2 of the fixed positioning protrusion 112a. Furthermore, the free end length L1 of the movable protrusion 111b is greater than the free end length L2 of the fixed positioning protrusion 111a. The free end length L1 of the movable protrusion 112b is greater than the free end length L2 of the fixed positioning protrusion 112a. Therefore, the first electromagnetic steel sheet 111 and the second electromagnetic steel sheet 112 can be easily processed, and the movable protrusions 111b, 112b can be formed with good spring characteristics.

[0105] Therefore, the magnet 12 can be reliably pressed against the fixed positioning protrusions 111a, 112a, high positioning accuracy of the magnet 12 relative to the outer circumferential surface 11a can be obtained, and a rotating motor 1 can be provided with excellent characteristics that suppress the occurrence of torque ripple or cogging torque.

[0106] In the method of assembling the rotor unit 14, no temporary holding jig is required for hardening the adhesive used to adhere the magnets 12, and there is no need to attach or remove the temporary holding jig. This makes it possible to provide a rotating electric machine 1 with excellent assembly workability.

[0107] Next, two modifications of the first embodiment, a second embodiment, a modification of the second embodiment, and a third embodiment will be described. In the following description, the same members as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted or simplified.

[0108] Variation 1 of the first embodiment In the above-described first embodiment, the first electromagnetic steel sheet 111 was used as the fourth electromagnetic steel sheet N4 and the 44th electromagnetic steel sheet N44. The second electromagnetic steel sheet 112 was used as the third electromagnetic steel sheet N3 and the 45th electromagnetic steel sheet N45. The other electromagnetic steel sheets were non-protruding electromagnetic steel sheets 110. Thereby, the magnet 12 was fixed at two locations in the axial direction, that is, on the front side and the rear side.

[0109] In the rotor core 11, the positions at which the first electromagnetic steel sheets 111, the second electromagnetic steel sheets 112, and the non-protruding electromagnetic steel sheets 110 are used may be changed as appropriate. Furthermore, the number of the first electromagnetic steel sheets 111, the number of the second electromagnetic steel sheets 112, and the number of the non-protruding electromagnetic steel sheets 110 may also be changed as appropriate.

[0110] FIG. 14A is a front view showing rotor core 11 according to Modification 1 of Embodiment 1. FIG. In this modified example, in addition to the configuration of the first embodiment, the first electromagnetic steel sheet 111 is adopted as the 23rd electromagnetic steel sheet N23, and the second electromagnetic steel sheet 112 is adopted as the 24th electromagnetic steel sheet N24. The 23rd electromagnetic steel sheet N23 and the 24th electromagnetic steel sheet N24 correspond to the central region 11M of the rotor core 11 in the axial direction. The central region 11M is the region between the rear region 11R and the front region 11F. In other words, the region between the first region and the second region is the central region 11M.

[0111] That is, the magnets 12 are fixed at three positions in the axial direction by three first electromagnetic steel sheets 111 corresponding to the fourth electromagnetic steel sheet N4, the 23rd electromagnetic steel sheet N23, and the 44th electromagnetic steel sheet N44. Similarly, the magnets 12 are fixed at three positions in the axial direction by three second electromagnetic steel sheets 112 corresponding to the third electromagnetic steel sheet N3, the 24th electromagnetic steel sheet N24, and the 45th electromagnetic steel sheet N45.

[0112] As shown in FIG. 14A, by arranging the first electromagnetic steel sheet 111 and the second electromagnetic steel sheet 112 in the central region 11M, the ease of inserting the magnet 12 between the movable protrusion and the fixed positioning protrusion can be adjusted. Furthermore, the holding force for holding the magnet 12 by the movable protrusion and the fixed positioning protrusion can be adjusted.

[0113] Modified Example 2 of the First Embodiment. Also, in the above-described first embodiment, the number of magnets 12 is eight, and the shape of the rotor core 11 is a substantially regular octagonal prism shape. The first embodiment does not limit the number of magnets 12, nor does it limit the shape of the rotor core 11. FIG. 14B is a top view showing the rotor core 11 according to the modified example 2 of the first embodiment.

[0114] 14B, the rotor core 11 according to this modification employs a cylindrical rotor using a segmented magnet 12. In this structure, the segmented magnet 12 is disposed between the movable protrusion 111b and the fixed positioning protrusion 111a. Similarly, the segmented magnet 12 is disposed between the movable protrusion 112b and the fixed positioning protrusion 112a. As described above, even in a configuration in which segment-shaped magnet 12 is fixed to a cylindrical rotor, the same effects as those of the first embodiment can be obtained.

[0115] Embodiment 2 The configuration of rotor core 11 according to embodiment 2 will be described with reference to Figs. 15 to 21. Fig. 15 is a perspective view showing the rotor core. Fig. 16 is a top view showing the rotor core. Fig. 17 is a front view showing the rotor core. Fig. 18 is a partially exploded view showing the rotor core. Fig. 19 is a view showing the rotor core, and is an enlarged view showing a portion indicated by reference symbol C in Fig. 16. Fig. 20 is a top view showing the third electromagnetic steel sheet. Fig. 21 is a top view showing the fourth electromagnetic steel sheet.

[0116] The rotor core 211 has the non-protruding electromagnetic steel sheet 110, the first electromagnetic steel sheet 111, and the second electromagnetic steel sheet 112 described in the first embodiment. The rotor core 211 further has a third electromagnetic steel sheet 113 and a fourth electromagnetic steel sheet 114. The rotor core 211 is an example of a laminated steel sheet in which a plurality of electromagnetic steel sheets are laminated in the Z direction.

[0117] As shown in Figs. 17 and 18, the first electromagnetic steel sheet N1, the second electromagnetic steel sheet N2, the ninth electromagnetic steel sheet N9 to the 39th electromagnetic steel sheet N39, the 46th electromagnetic steel sheet N46, and the 47th electromagnetic steel sheet N47 are non-protruding electromagnetic steel sheets 110. The fourth electromagnetic steel sheet N4 and the 42nd electromagnetic steel sheet N42 are first electromagnetic steel sheets 111. The sixth electromagnetic steel sheet N6 and the 44th electromagnetic steel sheet N44 are second electromagnetic steel sheets 112. The third electromagnetic steel sheet N3, the fifth electromagnetic steel sheet N5, the seventh electromagnetic steel sheet N7, the 41st electromagnetic steel sheet N41, the 43rd electromagnetic steel sheet N43, and the 45th electromagnetic steel sheet N45 are third electromagnetic steel sheets 113. The eighth electromagnetic steel sheet N8 and the 40th electromagnetic steel sheet N40 are fourth electromagnetic steel sheets 114.

[0118] <3rd electromagnetic steel plate 113> 20, the third electromagnetic steel sheet 113 is one of a plurality of electromagnetic steel sheets that make up the rotor core 211. Therefore, the non-protruding electromagnetic steel sheet 110 has a first arrangement region R1, a second arrangement region R2, a third arrangement region R3, a fourth arrangement region R4, a fifth arrangement region R5, a sixth arrangement region R6, a seventh arrangement region R7, and an eighth arrangement region R8.

[0119] The third electromagnetic steel sheet 113 is an electromagnetic steel sheet different from the first electromagnetic steel sheet 111, the second electromagnetic steel sheet 112, and the fourth electromagnetic steel sheet 114, and is an electromagnetic steel sheet that does not have any protrusions. The third electromagnetic steel sheet 113 has eight outer peripheral corners 113C and eight straight portions 113L. The third electromagnetic steel sheet 113 has eight notches 113a provided in one-to-one correspondence with the eight outer peripheral corners 113C. The notches 113a are located at the corners of a regular octagon.

[0120] In the axial direction, the position of the cutout portion 113a coincides with the movable protrusion 111b of the first electromagnetic steel sheet 111 and the movable protrusion 112b of the second electromagnetic steel sheet 112. In other words, the cutout portion 113a is formed so that the third electromagnetic steel sheet 113 does not overlap with the movable protrusions 111b, 112.

[0121] The shape of the cutout 113a is, for example, a substantially U-shape having corners. The shape of the cutout 113a is not limited to the shape shown in FIG. 20. The depth of the cutout 113a in the extending direction, i.e., in the depth direction of the U-shape, is adjustable. The shape of the recess 110a is not limited to the U-shape. As long as it is possible to avoid contact between the movable protrusions 111b, 112b and the third electromagnetic steel sheet 113, the shape of the cutout 113a is appropriately selected.

[0122] In other words, in the axial direction of the rotating shaft 10, the third electromagnetic steel sheet 113 is disposed between the first electromagnetic steel sheet 111 and the second electromagnetic steel sheet 112. The third electromagnetic steel sheet 113 is in contact with the first electromagnetic steel sheet 111 and the second electromagnetic steel sheet 112. When viewed in the axial direction, the cutout portion 113a does not overlap the first movable protrusion 111b of the first electromagnetic steel sheet 111 and the second movable protrusion 112b of the second electromagnetic steel sheet 112.

[0123] <4th electromagnetic steel plate 114> 21, the fourth electromagnetic steel sheet 114 is one of a plurality of electromagnetic steel sheets that make up the rotor core 211. Therefore, the non-protruding electromagnetic steel sheet 110 has a first arrangement region R1, a second arrangement region R2, a third arrangement region R3, a fourth arrangement region R4, a fifth arrangement region R5, a sixth arrangement region R6, a seventh arrangement region R7, and an eighth arrangement region R8.

[0124] The fourth electromagnetic steel sheet 114 has eight outer peripheral corners 114C and eight straight portions 114L. The fourth electromagnetic steel sheet 114 has eight guide protrusions 114a provided in one-to-one correspondence with the eight outer peripheral corners 114C. The guide protrusions 114a are located at the corners of a regular octagon. In other words, the guide protrusions 114a are arranged to be spaced apart in the circumferential direction. The fourth electromagnetic steel sheet 114 is integrally provided with a plurality of guide protrusions 114a spaced apart in the circumferential direction.

[0125] <Guide protrusion 114a> In the following description, the structure of the guide protrusions 114a in the first arrangement region R1 will be described. The other arrangement regions R2 to R8 have the same structure as the first arrangement region R1, and therefore descriptions thereof will be omitted.

[0126] The guide protrusion 114a is provided between a first straight portion 114LA and a second straight portion 114LB which correspond to two straight portions 114L adjacent to each other. The guide protrusions 114a protrude outward from the fourth electromagnetic steel sheet 114 in a direction perpendicular to the first straight portion 114LA. In other words, the guide protrusions 114a protrude outward from the fourth electromagnetic steel sheet 114.

[0127] Specifically, the guide protrusion 114a has a connecting portion 114c, a vertical extending portion 114d, an inclined portion 114e, an inclined end portion 114f, and a tip portion 114g. The connecting portion 114c is a portion where the second straight portion 114LB and the guide protrusion 114a are connected. The vertical extending portion 114d is a portion that extends from the connecting portion 114c in a direction perpendicular to the first straight portion 114LA. The tip portion 114g is a tip that is located on the outermost side of the guide protrusion 114a in a direction perpendicular to the first straight portion 114LA. The inclined portion 114e is connected to the vertical extending portion 114d at the inclined end portion 114f, and extends in a direction inclined with respect to the straight portion 114L. The inclined portion 114e is provided between the inclined end portion 114f and the tip portion 114g.

[0128] The distance between the connecting portion 114c and the inclined end portion 114f in a direction perpendicular to the first straight portion 114LA is the free end length L3. The width of the guide protrusion 114a in a direction parallel to the first straight portion 114LA is the width W3. The free end length L3 is smaller than the free end length L1. The width W3 is larger than the width W1. Therefore, the guide protrusion 114a has a structure that is less likely to deform due to an external force than the movable protrusions 111b and 112b.

[0129] As shown in the left portion of FIG. 19, the guide protrusion 114a is disposed so as to overlap with the movable protrusion 111b of the first electromagnetic steel sheet 111. Specifically, the guide protrusion 114a protrudes perpendicularly to the outer circumferential portion 11A. The movable protrusion 111b also protrudes perpendicularly to the outer circumferential portion 11A. The distance between the outer circumferential portion 11A and the tip end 114g of the guide protrusion 114a is P4. The distance between the outer circumferential portion 11A and the tip end 111x of the movable protrusion 111b is P1. The distance P4 is the same as or greater than the distance P1.

[0130] As shown in the right part of FIG. 19, the guide protrusion 114a is disposed so as to overlap with the movable protrusion 112b of the second electromagnetic steel sheet 112. Specifically, the guide protrusion 114a protrudes perpendicularly to the outer circumferential portion 11A. The movable protrusion 112b also protrudes perpendicularly to the outer circumferential portion 11A. The distance between the outer circumferential portion 11A and the tip end 114g of the guide protrusion 114a is P4. The distance between the outer circumferential portion 11A and the tip end 112x of the movable protrusion 112b is P2. The distance P4 is the same as or greater than the distance P2.

[0131] The guide protrusion 114a does not have the lead-in tapered portion provided on the movable protrusions 111b and 112b. In other words, the guide protrusion 114a is not a portion for fixing the magnet 12. The guide protrusion 114a is a portion for guiding the magnet 12 so that the magnet 12 comes into contact with the lead-in tapered portions of the movable protrusions and 112b.

[0132] When the magnet 12 is attached to the outer circumferential portion 11A, the side surface 12d of the magnet 12 comes into contact with the lead-in tapered portion, and the movable protrusions 111b, 112b are elastically deformed. For this reason, the arrangement of the guide protrusions 114a on the fourth electromagnetic steel sheet 114 is determined according to the amount of deformation caused by the elastic deformation of the movable protrusions 111b, 112b. In other words, the arrangement of the guide protrusions 114a is set so that the side surface 12d of the magnet 12 and the guide protrusions 114a do not come into contact with each other. In other words, the guide protrusion 114a is a displacement restricting portion that restricts the displacement of the first movable protrusion 111b and the second movable protrusion 112b in the circumferential direction.

[0133] <Advantages of the second embodiment> According to the second embodiment, the movable protrusions 111b and 112b do not come into contact with each other by disposing the third electromagnetic steel sheet 113 between the first electromagnetic steel sheet 111 and the second electromagnetic steel sheet 112. This allows the movable protrusions 111b and 112b to elastically deform more smoothly without being affected by friction, making it possible to reliably fix the magnet 12.

[0134] When fixing the magnet 12 to the outer periphery 11A, even if the position of the magnet 12 is misaligned with respect to the rotor core 211, the magnet 12 comes into contact with the guide protrusion 114a, and the guide protrusion 114a moves the magnet 12 toward the outer periphery 11A. This makes it possible to prevent the magnet 12 from coming into contact with the tips of the movable protrusions 111b, 112b. It is possible to prevent unnecessary deformation, such as buckling, of the movable protrusions 111b, 112b. Therefore, the magnet 12 is reliably fixed by the movable protrusions 111b, 112b, which have been prevented from being deformed.

[0135] The third electromagnetic steel sheet 113 is disposed between the first electromagnetic steel sheet 111 and the fourth electromagnetic steel sheet 114. The first electromagnetic steel sheet 111 and two third electromagnetic steel sheets 113 are disposed between the second electromagnetic steel sheet 112 and the fourth electromagnetic steel sheet 114. This prevents the movable protrusion 111b and the guide protrusion 114a from contacting each other, and prevents the movable protrusion 112b and the guide protrusion 114a from contacting each other. Therefore, the movable protrusion 111b and the guide protrusion 114a can elastically deform more smoothly without being affected by friction, and the magnet 12 can be reliably fixed.

[0136] In conventional rotating electric machines, the width of the movable positioning protrusions must be set narrower than the width of the fixed positioning protrusions. This makes it difficult to manufacture the rotor core, and when the magnets are pressed into the rotor core, the movable positioning protrusions are deformed, making it difficult to reliably press the magnets against the fixed positioning protrusions. This reduces the accuracy of magnet placement, and deteriorates motor characteristics such as cogging torque.

[0137] In contrast, according to the second embodiment, since the fourth electromagnetic steel plate 114 having the guide protrusions 114a is used, the magnet 12 can be smoothly pressed into the rotor core 211, and the occurrence of plastic deformation of the movable protrusions 111b, 112b can be prevented. Therefore, the arrangement accuracy of the magnet 12 does not decrease, and the problem of deterioration of the motor characteristics such as the cogging torque does not occur.

[0138] Since the rotor core 211 includes the fourth electromagnetic steel plate 114 having the guide protrusions 114a, the movable protrusions 111b, 112b are prevented from being excessively deformed in the circumferential direction. This makes it possible to prevent the occurrence of large plastic deformation in the movable protrusions 111b, 112b. Furthermore, it is possible to prevent the pressing force of the magnet 12 by the movable protrusions 111b, 112b from being lost.

[0139] A variation of the second embodiment. In the above-described second embodiment, a structure is adopted in which movable protrusions 111b and 112b do not come into contact with each other by disposing third electromagnetic steel sheet 113 between first electromagnetic steel sheet 111 and second electromagnetic steel sheet 112. This modified example shows a different structure in which movable protrusions 111b and 112b do not come into contact with each other.

[0140] FIG. 22 is a perspective view showing a first electromagnetic steel sheet 311 according to this modified example. 22, the first electromagnetic steel sheet 311 has a thickness T1 in the axial direction. The movable protrusion 111b of the first electromagnetic steel sheet 311 has a thickness T2 in the axial direction. The thickness T2 is smaller than the thickness T1.

[0141] Similarly, the second electromagnetic steel sheet 312 has a thickness T1 in the axial direction. The movable protrusion 112b of the second electromagnetic steel sheet 312 has a thickness T2 in the axial direction. Thickness T2 is smaller than thickness T1. Note that the second electromagnetic steel sheet 312 is obtained by changing the thickness of the movable protrusion 112b of the second electromagnetic steel sheet 112 shown in FIG. 9 as described above.

[0142] By applying such first electromagnetic steel sheet 311 and second electromagnetic steel sheet 312 to rotor core 211, movable protrusion 111b and movable protrusion 112b can elastically deform more smoothly without being affected by friction, making it possible to reliably fix magnet 12. Furthermore, since there is no need to use third electromagnetic steel sheet 113, the number of types of electromagnetic steel sheets can be reduced, and the process of stacking multiple electromagnetic steel sheets in rotor core 211 is simplified.

[0143] Embodiment 3 Next, a rotor unit 414 having a stage skew structure that is applied to the rotating electric machine 1 will be described. Fig. 23 is a perspective view showing the rotor unit 414, illustrating a state before magnets are fixed to the rotor unit. Fig. 24 is a perspective view showing the rotor unit.

[0144] <Rotor unit 414> As shown in FIG. 23, the rotor unit 414 has a rotating shaft 10 and two rotor cores 11. The rotating shaft 10 is press-fitted into the first through holes 11b of the two rotor cores 11 and fixed. The two rotor cores 11 are arranged so as to overlap in the Z direction. The two rotor cores 11 are arranged so as to be shifted by a predetermined angle in the circumferential direction. The rotor cores 11 are the rotor cores described in the above-mentioned embodiment 1.

[0145] In other words, the rotating electric machine according to the third embodiment includes a plurality of rotor units 14. Each of the plurality of rotor units 14 corresponds to the rotor unit 14 described above. The plurality of rotor units 14 are fixed to the rotating shaft 10 so as to overlap each other. The plurality of rotor units 14 are arranged to be shifted from each other in the circumferential direction.

[0146] <Assembling method of rotor unit 414> Next, a method for assembling the rotor unit 414 will be described. The method of assembling the rotor unit 414 is similar to the method of assembling the rotor unit 14 described above.

[0147] First, an adhesive or the like is applied in advance to the outer circumferential surface 11a of the rotor core 11. After that, the multiple magnets 12 are inserted into the outer circumferential surface 11a of the rotor core 11 in order. When magnet 12 is in close contact with outer circumferential surface 11a of rotor core 11, magnet 12 is pressed against outer circumferential surface 11a by movable protrusions 111b, 112b, so that the position of magnet 12 is determined and maintained.

[0148] By hardening the adhesive in this state, rotor unit 414 shown in Fig. 23 is obtained. In rotor unit 414, the multiple magnets 12 are fixed to rotor core 11 with high precision. As described above, in rotor unit 414 having a step-skew structure, even if the number of rotor cores or the number of magnets is increased, it is possible to easily fix multiple magnets 12. There is no need for a temporary holding jig for hardening the adhesive used to adhere magnets 12, and there is no need to attach or remove the temporary holding jig. Therefore, it is possible to provide a rotating electric machine 1 with even better assembly workability. In the rotor unit 414, the rotor core 11 may be replaced with the rotor core 211 described in the above-mentioned second embodiment. In addition, in the present disclosure, the embodiments can be combined, modified, or omitted as appropriate. [Explanation of symbols]

[0149] Reference Signs List 1... rotating machine, 2... frame, 2A... opening, 2B... inner wall surface, 2C... inner region, 2D... base, 2M... frame body, 3... stator, 3A... stator outer surface, 3B... stator inner surface, 3C... stator upper surface, 3D... stator lower surface, 4... insulator, 5... stator winding, 6... terminal, 7, 9... bearing, 8... bearing holder, 10... rotating shaft, 10A... central region, 10B, 10C... end, 11... rotor core, 11a... outer peripheral surface, 11A... outer peripheral portion, 11b... first through hole, 11c... engagement recess, 11d... second through hole, 11F... front region, 11M... central region, 11R... rear region, 12 ...Magnet (first magnet, second magnet), 12a...cylindrical surface, 12b...flat surface, 12c...side surface, 12d...side surface, 13...protective tube, 14, 414...rotor unit (rotor), 15...joint, 16...heat sink, 17...sensor, 18...control device, 110...non-protruding electromagnetic steel sheet, 110a...recess, 110C...outer circumferential corner, 110L...straight portion, 111...first electromagnetic steel sheet, 111a...fixed positioning protrusion (first fixed positioning protrusion), 111af...tip portion, 111ak...inclined portion, 111as...inclined end portion, 111at...fixed extension surface, 111b...first movable protrusion, 111bx...movable extension surface, 1 11c...Introduction taper part, 111C...Outer periphery corner part, 111L...Straight line part, 111p...First movable oblique recess, 111p...Concave part, 111q...First movable straight part Cross recess, 111q...recess, 111r, 111s, 111u...bottom, 111t...first fixed extension recess, 111x...tip, 112...second electromagnetic steel Plate, 112a...Fixed positioning protrusion (second fixed positioning protrusion), 112af...Tip part, 112ak...Slanted part, 112as...Slanted end part, 112at...Fixed extension surface, 112b...Second movable protrusion, 112bx...Movable extension surface, 112c...Introduction taper part, 112C...Outer periphery corner part, 112L...Straight line part , 112p...second movable oblique recess, 112p...recess, 112q...second movable orthogonal recess, 112q...recess, 112r, 112s, 112u...bottom, 112t...second fixed extending recess, 112x...tip, 113...third electromagnetic steel sheet, 113a...notch, 113C...outer circumferential corner, 113L...straight portion, 114...fourth electromagnetic steel sheet, 114a...guide protrusion, 114c...connection portion, 114C...outer circumferential corner, 114d...vertical extending portion, 114e...inclined portion, 114f...inclined end, 114g...tip, 114L...straight portion, 114LA...first straight portion, 114LB...second straight portion, 211...rotor core,311…First electromagnetic steel sheet, 312…Second electromagnetic steel sheet,

Claims

1. A stator; a rotor including a rotating shaft, a laminated steel plate formed of a plurality of electromagnetic steel plates fixed to the rotating shaft and having an outer periphery, and a plurality of first magnets and a plurality of second magnets arranged alternately on the outer periphery in a circumferential direction, the rotor being spaced apart from the stator and surrounded by the stator; Equipped with the laminated steel plate includes a first electromagnetic steel plate that fixes the plurality of first magnets and a second electromagnetic steel plate that fixes the plurality of second magnets, the first electromagnetic steel sheet has a first fixed positioning protrusion that positions one end of the first magnet in the circumferential direction and protrudes toward an outside of the first electromagnetic steel sheet, and a first movable protrusion that presses the other end of the first magnet in the circumferential direction toward the first fixed positioning protrusion and protrudes toward the outside of the first electromagnetic steel sheet, the second electromagnetic steel sheet has a second fixed positioning protrusion that positions one end of the second magnet in the circumferential direction and protrudes toward an outside of the second electromagnetic steel sheet, and a second movable protrusion that presses the other end of the second magnet in the circumferential direction toward the second fixed positioning protrusion and protrudes toward the outside of the second electromagnetic steel sheet. Rotating electric motor.

2. the first electromagnetic steel sheet and the second electromagnetic steel sheet are arranged in a first region which is one region in an axial direction of the rotation shaft and a second region which is the other region in the axial direction. The rotating electric machine according to claim 1 .

3. The first electromagnetic steel sheet and the second electromagnetic steel sheet are disposed between the first region and the second region. The rotating electric machine according to claim 2 .

4. A free end length of the first movable protrusion is greater than a free end length of the first fixed positioning protrusion, The free end length of the second movable protrusion is greater than the free end length of the second fixed positioning protrusion, The rotating electric machine according to any one of claims 1 to 3.

5. the laminated steel sheet includes a third electromagnetic steel sheet disposed between the first electromagnetic steel sheet and the second electromagnetic steel sheet in the axial direction of the rotation shaft, the third electromagnetic steel sheet is in contact with the first electromagnetic steel sheet and the second electromagnetic steel sheet, The third electromagnetic steel sheet has a notch, When viewed in the axial direction, the cutout portion does not overlap with the first movable protrusion of the first electromagnetic steel sheet and the second movable protrusion of the second electromagnetic steel sheet. The rotating electric machine according to any one of claims 1 to 4.

6. a thickness of the first movable protrusion of the first electromagnetic steel sheet in the axial direction of the rotation shaft is smaller than a thickness of the first electromagnetic steel sheet, A thickness of the second movable protrusion of the second electromagnetic steel sheet in the axial direction is smaller than a thickness of the second electromagnetic steel sheet. The rotating electric machine according to any one of claims 1 to 4.

7. The laminated steel sheet includes a fourth electromagnetic steel sheet having a plurality of guide projections spaced apart in the circumferential direction, Each of the plurality of guide protrusions protrudes toward an outer side of the fourth electromagnetic steel sheet and has a tip portion, When viewed in the axial direction of the rotation shaft, one of the plurality of guide protrusions overlaps with the first movable protrusion, a distance between the outer circumferential portion of the rotor and the tip end of the guide protrusion is equal to or greater than a distance between the outer circumferential portion of the rotor and the tip end of the first movable protrusion, When viewed in the axial direction of the rotation shaft, one of the plurality of guide protrusions overlaps with the second movable protrusion, a distance between the outer circumferential portion of the rotor and the tip of the guide protrusion is equal to or greater than a distance between the outer circumferential portion of the rotor and the tip of the second movable protrusion; The rotating electric machine according to any one of claims 1 to 6.

8. The guide protrusion is a displacement regulating portion that regulates displacement of at least one of the first movable protrusion and the second movable protrusion in the circumferential direction. The rotating electric machine according to claim 7.

9. a plurality of rotors each corresponding to said rotor; The rotors are fixed to the rotating shaft so as to overlap each other, The plurality of rotors are arranged to be shifted from each other in the circumferential direction. The rotating electric machine according to any one of claims 1 to 8.

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