Rotary electric machine

Abstract

To provide a rotary electric machine capable of improving drive efficiency.SOLUTION: A rotary electric machine 1 comprises: a rotary shaft 10; a rotor 14 fixed to the rotary shaft 10 and including a multilayer core 11 configured by laminating a plurality of core pieces consisting of a plurality of electromagnetic steel sheets in an axial direction X and a plurality of magnets 12 disposed while being spaced in a circumferential direction of an outer periphery of the multilayer core 11; and a stator 3 which is separated from the rotor 14 and disposed while enclosing the rotor 14, wherein as the core pieces, a first core piece 111 and a second core piece 112 are present. The first core piece 111 includes a positioning projection 111C, which positions one end of the magnet 12 in the circumferential direction, protruding outward in a radial direction, and the second core piece 112 includes a movable projection 112C, which presses the other end of the magnet 12 in the circumferential direction, toward one end in the circumferential direction, protruding outward in the radial direction.SELECTED DRAWING: Figure 16

Description

[Technical field]

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

[0002] Conventionally, in a rotating electric machine that rotates a rotor unit inside a coil, a structure is known in which a magnet is fixed to the outer circumferential surface of a rotor made of electromagnetic steel sheets using an adhesive. For example, Patent Document 1 discloses a structure in which a magnet is pressed between a fixed protrusion and a movable positioning protrusion, and the magnet is fixed with an adhesive. [Prior art documents] [Patent documents]

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

[0004] Conventional rotating electric machines require the fixed protrusion and the movable positioning protrusion to be spaced apart, which results in a wide gap between adjacent magnets, which increases the size of the rotating electric machine, increases the area where the magnetic force is low, and reduces the drive efficiency.

[0005] The present application discloses a technique for solving the above-mentioned problems, and has an object to provide a rotating electric machine capable of improving drive efficiency. [Means for solving the problem]

[0006] The rotating electric machine disclosed in the present application comprises: A rotation axis; a rotor having a laminated core fixed to the rotating shaft and having a plurality of core pieces, each made of a plurality of electromagnetic steel plates, laminated in the axial direction, and a plurality of magnets arranged at intervals in the circumferential direction on the outer periphery of the laminated core; a stator disposed apart from the rotor and surrounding the rotor, The core pieces include a first core piece and a second core piece, The first core piece has a positioning protrusion that protrudes radially outward to position one end of the magnet in the circumferential direction, The second core piece has a movable protrusion that protrudes radially outward and presses the other circumferential end of the magnet toward one circumferential end of the magnet. Effect of the Invention

[0007] According to the rotating electric machine disclosed in the present application, Driving efficiency can be improved. [Brief description of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view showing a configuration of a rotating electric machine according to a first embodiment. [Diagram 2] 2 is a perspective view showing the configuration of a rotor and a rotating shaft of the rotating electric machine shown in FIG. [Diagram 3] 2 is a top view showing the configuration of a magnet of the rotating electric machine shown in FIG. [Figure 4] 3 is a perspective view showing a configuration of a laminated core of the rotor shown in FIG. 2. [Diagram 5] 5 is a top view showing the configuration of the laminated core shown in FIG. 4. [Figure 6] 5 is a front view showing the configuration of the laminated core shown in FIG. 4. [Figure 7] 5 is a partial exploded view showing the configuration of the laminated core shown in FIG. 4. [Figure 8] 8 is a top view showing the configuration of a first core lamination of the laminated core shown in FIG. 7. [Figure 9] 9 is an enlarged top view showing the configuration of a portion B of a first core lamination shown in FIG. 8. FIG. [Figure 10] 8 is a top view showing the configuration of a second core lamination of the laminated core shown in FIG. 7. [Figure 11] 11 is an enlarged top view showing the configuration of a portion C of a second core lamination shown in FIG. [Figure 12]8 is a top view showing the configuration of a third core lamination of the laminated core shown in FIG. 7. FIG. [Figure 13] 6 is an enlarged top view showing the configuration of a portion A of the laminated core shown in FIG. 5. [Figure 14] 14 is an enlarged top view showing the configuration of a portion D of the laminated core shown in FIG. 13. FIG. [Figure 15] 14 is a top view showing a state in which magnets are inserted into the laminated core shown in FIG. 13. FIG. [Figure 16] 16 is a top view showing the state after magnets have been inserted into the laminated core shown in FIG. 15. FIG. [Figure 17] 17 is an enlarged top view showing the configuration of a portion E in the state after magnets have been inserted into the laminated core shown in FIG. 16. FIG. [Figure 18] 5 is a perspective view showing the configuration of a rotor in which all magnets are attached to the laminated core shown in FIG. 4. FIG. [Figure 19] 10 is a perspective view showing the configuration of another second core lamination according to embodiment 1. FIG. [Figure 20] 4 is a front view showing the configuration of another laminated core according to embodiment 1. FIG. [Figure 21] 11 is a perspective view showing a configuration of a rotor and a rotating shaft of a rotating electric machine according to a second embodiment. FIG. [Figure 22] FIG. 17 is a perspective view showing the configuration of the rotor shown in FIG. 16 before magnets are installed. [Figure 23] FIG. 2 is a block diagram showing a configuration of a control device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] In the rotating electric machine described in the following embodiments, the same or similar components are denoted by the same reference numerals in each drawing. Furthermore, the drawings show the embodiments in a schematic or conceptual manner. The relationship between the thickness and width of each part shown in the drawings, the size ratio between parts, etc. are not necessarily the same as those of the actual members. Illustrations of components unrelated to the features of the present disclosure may be omitted.

[0010] The rotating electric machine according to the embodiment is applied to an electric power steering device mounted on a vehicle. The electric 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.

[0011] In addition, in each drawing, the X direction, Y direction, and Z direction corresponding to a three-dimensional Cartesian coordinate system are shown (symbols X, Y, Z). The axial direction Z of the rotating electric machine is the Z direction, and the directions perpendicular to the Z direction are the X direction and the Y direction.

[0012] In addition, the terms "circumferential direction", "radial direction", and "axial direction" used in the following description correspond to the "circumferential direction", "radial direction", and "axial direction" in a rotating electric machine, respectively. Furthermore, the term "stacking direction" corresponds to the "axial Z direction" and the "Z direction".

[0013] Furthermore, the terms "front side" and "rear side" may be used to describe the configuration of a rotating electric machine. The front side refers to the side where the rotating electric machine is attached to a vehicle and where members that transmit the power of the rotating electric machine to the vehicle are arranged. The rear side is the opposite side to the front side. A control device is arranged on the rear side.

[0014] Embodiment 1 Fig. 1 is a cross-sectional view showing the configuration of a rotating electric machine according to a first embodiment. Fig. 2 is a perspective view showing the configuration of a rotor and a rotating shaft of the rotating electric machine shown in Fig. 1. Fig. 3 is a top view showing the configuration of a magnet of the rotating electric machine shown in Fig. 1. Fig. 4 is a perspective view showing the configuration of a laminated core of the rotor shown in Fig. 2. Fig. 5 is a top view showing the configuration of the laminated core shown in Fig. 4. Fig. 6 is a front view showing the configuration of the laminated core shown in Fig. 4.

[0015] FIG. 7 is a partial exploded view showing the configuration of the laminated core shown in FIG. 4. FIG. 8 is a top view showing the configuration of the first core lamination of the laminated core shown in FIG. 7. FIG. 9 is an enlarged top view showing the configuration of portion B of the first core lamination shown in FIG. 8. FIG. 10 is a top view showing the configuration of the second core lamination of the laminated core shown in FIG. 7. FIG. 11 is an enlarged top view showing the configuration of portion C of the second core lamination shown in FIG. 10. FIG. 12 is a top view showing the configuration of the third core lamination of the laminated core shown in FIG. 7. FIG. 13 is an enlarged top view showing the configuration of portion A of the laminated core shown in FIG. 5.

[0016] Fig. 14 is an enlarged top view showing the configuration of portion D of the laminated core shown in Fig. 13. Fig. 15 is a top view showing a state in which magnets are inserted into the laminated core shown in Fig. 13. Fig. 16 is a top view showing a state after magnets have been inserted into the laminated core shown in Fig. 15. Fig. 17 is an enlarged top view showing the configuration of portion E of the laminated core shown in Fig. 16 after magnets have been inserted. Fig. 18 is a perspective view showing the configuration of a rotor in which all magnets are attached to the laminated core shown in Fig. 4. Fig. 19 is a perspective view showing the configuration of another second core piece according to embodiment 1. Fig. 20 is a front view showing the configuration of another laminated core according to embodiment 1.

[0017] As shown in Fig. 1, the rotating electric machine 1 includes a frame 2, a stator 3, a terminal 6, a bearing 7, a bearing 9, a bearing holder 8, a rotating shaft 10, a rotor 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. The frame 2, which is the housing of the rotating electric machine 1, is substantially cylindrical with an opening on the rear side (upper side on the paper surface of Fig. 1) and is made of an inexpensive, lightweight aluminum alloy.

[0018] The heat sink 16 is made of an aluminum alloy or the like having excellent thermal conductivity, and is fixed to the rear opening end of the frame 2. A sensor 17 and a control device 18 are installed on the heat sink 16. The joint 15 is installed at the end of the front side (upper, lower side of the paper surface of FIG. 1) of the rotating shaft 10 in order to transmit power to the vehicle side. The control device 18 is equipped with a power conversion circuit having a power semiconductor that converts direct current from the outside, and a control circuit, and the required current is supplied to the stator winding 5 via the terminal 6. This generates a rotational force in the laminated core 11, which rotates the rotor 14 and, ultimately, the joint 15.

[0019] The stator 3 is formed by stacking a plurality of core pieces, which will be described later and are made of a plurality of electromagnetic steel plates, in the axial direction Z, and is press-fitted and fixed to the frame 2. A stator winding 5 is wound around the stator 3 via an insulator 4, which is an insulating material such as resin. An end of the stator winding 5 is connected to a terminal 6. In addition, a bearing 7 is fixed to the front side of the frame 2, and a bearing 9 is fixed to the rear side via a bearing holder 8.

[0020] As shown in Fig. 2, rotor 14 includes laminated core 11 and magnet 12. Rotating shaft 10 is formed of a metal material such as carbon steel. Laminated core 11 formed by laminating electromagnetic steel sheets is fixed to rotating shaft 10, and a plurality of magnets 12 are adhesively fixed to the outer periphery of laminated core 11 at intervals in the circumferential direction. As shown in Fig. 1, rotating shaft 10 is rotatably supported by bearing 7 and bearing 9, rotor 14 and stator 3 are separated from each other, and stator 3 is disposed so as to surround the outer periphery of rotor 14.

[0021] As shown in Fig. 3, the magnet 12 is an ND-FE-B sintered magnet, and its surface is coated with anti-rust plating or the like. The magnet 12 has a cylindrical surface 12A extending radially outward in the axial direction Z, a flat installation surface 12B located radially inward on the opposite side to the cylindrical surface 12A, a first side surface 12D at one end in the circumferential direction, and a second side surface 12C at the other end in the circumferential direction. The dimension from the first side surface 12D to the second side surface 12C is defined as a length M1. A corner 12H is defined between the installation surface 12B and the second side surface 12C of the magnet 12.

[0022] 4 and 5, the laminated core 11 is formed by stacking a plurality of core pieces made of electromagnetic steel sheets in the axial direction Z. The shape of the laminated core 11 is an example, and the outer shape is a generally regular octagonal prism, has eight outer peripheral surfaces 11A on which magnets 12 are arranged, and is provided with a through hole 11B in the center for inserting the rotating shaft 10. The core pieces of the laminated core 11 include a first core piece 111, a second core piece 112, and a third core piece 110, as shown in FIGS.

[0023] 8, the first core lamination 111 has a generally regular octagonal shape having eight outer peripheral surfaces 111A that form the laminated core 11 and a through hole 111B in the center for inserting the rotating shaft 10. Furthermore, eight positioning protrusions 111C of the same shape that protrude radially outward are integrally provided at eight outer peripheral corners.

[0024] 9, the positioning protrusion 111C has a positioning surface 111D and a non-positioning surface 111E. The positioning surface 111D is one surface perpendicular to the outer peripheral surface 111A, and is a surface that abuts against the first side surface 12D of the magnet 12 to position the magnet 12 in the circumferential direction. The non-positioning surface 111E is the other surface perpendicular to the outer peripheral surface 111A, and is a surface that is disposed so as to have a gap between the second side surface 12C of the magnet 12.

[0025] A length C1 (see FIG. 8) between the positioning surface 111D and a non-positioning surface 111E facing the positioning surface 111D is formed to be longer than a length M1 (see FIG. 3) from the first side surface 12D to the second side surface 12C of the magnet 12. In addition, the outermost location on the radial outside of the positioning protrusion 111C is defined as an outermost formation position 111H.

[0026] 10 and 11, the second core laminations 112 are shaped like a regular octagon having eight outer peripheral surfaces 112A that form the laminated core 11 and a through hole 112B in the center for inserting the rotating shaft 10. Furthermore, eight movable protrusions 112C of the same shape are integrally provided at eight outer peripheral corners, protruding radially outward and having notches 112F, 112G that extend radially inward.

[0027] The movable protrusion 112C has an introduction taper portion 112E that is inclined toward the side opposite to the side that presses the magnet in the circumferential direction at the end portion 112D on the radial tip side. All of the introduction taper portions 112E of the eight movable protrusions 112C are formed facing the same circumferential direction. The outermost location on the radial outside of the movable protrusion 112C is defined as the outermost formation position 112H.

[0028] The length L1 of the movable protrusion 112C is determined according to the length of the cutouts 112F and 112G. When the length L1 of the movable protrusion 112C is long, the movable protrusion 112C can be formed to easily elastically deform in the circumferential direction. The length L1 of the movable protrusion 112C here refers to the length of the movable protrusion 112C in the extension direction from the portion of the introduction taper portion 112E that contacts the first side surface 12D (or the second side surface 12C) of the magnet 12 to the base portion of the movable protrusion 112C that connects to the bottom of the cutout portion 112F. The length L1 of the movable protrusion 112C is formed in consideration of the insertion load of the magnet 12 and the range of elastic deformation due to the elastic restoring force (also called spring force) of the movable protrusion 112C.

[0029] 12, the third core lamination 110 has a generally regular octagonal shape having eight outer peripheral surfaces 110A that form the laminated core 11, and a through hole 110B in the center for inserting the rotating shaft 10. Furthermore, unlike the first core lamination 111 and the second core lamination 112, the eight outer peripheral corners do not have protrusions, but have arc-shaped cutout portions 110C.

[0030] The thicknesses of third core laminations 110, first core laminations 111, and second core laminations 112 do not necessarily have to be the same. For example, by making the thickness of second core laminations 112 thinner than the thicknesses of third core laminations 110 and first core laminations 111, movable protrusions 112C become more likely to elastically deform in the circumferential direction with a smaller force. The thickness of the portion of movable protrusions 112C is set taking into consideration the insertion load of magnets 12 and the range of elastic deformation.

[0031] Next, a method of assembling the rotor of the rotating electric machine of the first embodiment configured as described above will be described. First, the first core laminations 111, the second core laminations 112, and the third core laminations 110 are stacked in the axial direction Z as shown in Fig. 4 to form the laminated core 11. Specifically, as shown in Fig. 6 and Fig. 7, from the bottom in the axial direction Z, four first core laminations 111, one second core lamination 112, 37 third core laminations 110, one second core lamination 112, and four first core laminations 111 are stacked in this order.

[0032] That is, in the laminated core 11, four first core laminations 111 are arranged on each end side in the axial direction Z, and one second core lamination 112 is arranged inside them. Furthermore, third core laminations 110 are arranged between the second core laminations 112. Note that this configuration is one example, and the number of laminated core laminations 111, 112, 110 can be changed as appropriate depending on the design of the rotating electric machine, such as the driving force.

[0033] As shown in Figure 13, when stacked in this manner, the length C2 from the positioning surface 111D of the positioning protrusion 111C to the leading taper portion 112E of the movable protrusion 112C is formed to be shorter than the length C1 (see Figure 8) between the positioning surface 111D and the non-positioning surface 111E opposite the positioning surface 111D, so that when viewed from the axial direction Z, the leading taper portion 112E of the movable protrusion 112C is exposed from the positioning protrusion 111C.

[0034] 5, 13, and 14, the outermost radial formation position 112H of the movable protrusion 112C is formed radially inward from the outermost radial formation position 111H of the positioning protrusion 111C when viewed from above in the axial direction Z. In this manner, in the laminated core 11, the positioning protrusion 111C and the movable protrusion 112C are arranged so as to partially overlap when viewed from the axial direction Z. In addition, in FIGS. 13 and 14, the portion of the movable protrusion 112C that overlaps with the positioning protrusion 111C is indicated by a dashed line.

[0035] Next, before attaching the magnet 12 to the laminated core 11, an adhesive is applied to the outer peripheral surface 11A of the laminated core 11. The adhesive is, for example, a thermosetting silicone adhesive or a two-part curing acrylic adhesive. Next, as shown in FIG. 15, first, the first side surface 12D of the magnet 12 is brought into contact with the positioning surface 111D of the positioning protrusion 111C. Then, the cylindrical surface 12A of the magnet 12 is pressed against the outer peripheral surface 11A by an insertion force F from the radial outside of the laminated core 11.

[0036] At this time, since length C2 (see FIG. 13) from positioning surface 111D of positioning protrusion 111C to leading taper portion 112E of movable protrusion 112C is formed shorter than length M1 (see FIG. 3) from first side surface 12D to second side surface 12C of magnet 12, corner portion 12H between mounting surface 12B and second side surface 12C of magnet 12 comes into contact with leading taper portion 112E of movable protrusion 112C. Then, by further applying insertion force F, movable protrusion 112C deforms outward in the circumferential direction (deforms to the right on the paper surface of FIG. 15).

[0037] In this way, in the process of applying an insertion force F to the magnet 12 from the cylindrical surface 12A and inserting it into the outer circumferential surface 11A of the laminated core 11, the outermost radial formation position 112H of the movable protrusion 112C is formed radially inward from the outermost radial formation position 111H of the positioning protrusion 111C when viewed from above in the axial direction Z, so that the magnet 12 does not come into contact with the outermost radial end 112D of the movable protrusion 112C, but only with the lead-in tapered portion 112E. Therefore, the insertion force F applied when inserting the magnet 12 does not cause unnecessary deformation such as buckling of the movable protrusion 112C.

[0038] 16 and 17, as the magnet 12 is inserted, the movable protrusion 112C deforms in the circumferential direction, and in a state where the magnet 12 is inserted until the installation surface 12B of the magnet 12 is in close contact with the outer peripheral surface 110A of the laminated core 11, the magnet 12 is sandwiched between the movable protrusion 112C and the positioning protrusion 111C by the elastic restoring force of the movable protrusion 112C. As shown in FIG. 17, the length C2 (see FIG. 13) from the positioning surface 111D of the positioning protrusion 111C to the introduction taper portion 112E of the movable protrusion 112C is shorter than the length M1 (see FIG. 3) from the first side surface 12D to the second side surface 12C of the magnet 12, but since the movable protrusion 112C deforms in the circumferential direction as the magnet 12 is inserted, the second side surface 12C of the magnet 12 is in contact with the movable protrusion 112C.

[0039] Furthermore, the length C1 (see Figure 8) between the positioning surface 111D and the non-positioning surface 111E opposite the positioning surface 111D is longer than the length M1 (see Figure 3) from the first side 12D to the second side 12C of the magnet 12, so that the second side 12C of the magnet 12 is not in contact with the non-positioning surface 111E of the positioning protrusion 111C.

[0040] Next, all the magnets 12 are attached to the laminated core 11 in the same manner as described above (FIG. 18). Thus, the magnets 12 are arranged so that the installation surfaces 12B of the magnets 12 are in close contact with all eight outer peripheral surfaces 11A of the laminated core 11. The second side surface 12C of the magnets 12 is pressed in the circumferential direction by the movable protrusions 112C of the second core pieces 112 forming the laminated core 11. The first side surface 12D of the magnets 12 is abutted against and fixed to the positioning surfaces 111D of the positioning protrusions 111C of the first core pieces 111 arranged near the upper and lower ends of the laminated core 11 in the axial direction Z. Next, the adhesive is cured, so that the eight magnets 12 are fixed to the eight outer peripheral surfaces 11A of the laminated core 11.

[0041] In the above-mentioned first embodiment, an example is shown in which the second core laminations 112 are formed to a uniform thickness, but the present invention is not limited to this, and for example, the thickness of the movable protrusion 112C may be made thinner by forging, machining, etc. than the thickness of the portion where the movable protrusion 112C is not formed, as shown in Fig. 19. By configuring the movable protrusion 112C to be thinner, the movable protrusion 112C becomes more likely to be elastically deformed in the circumferential direction with a smaller force.

[0042] However, the thickness of movable protrusion 112C is set taking into consideration the insertion load and range of elastic deformation of magnet 12. Furthermore, by making movable protrusion 112C thinner, it does not come into contact with movable protrusions 112C of third core laminations 110 and first core laminations 111, which are stacked above and below in axial direction Z, and elastic deformation is possible without friction in the circumferential direction. Therefore, the pressing force of magnet 12 is stable and can be maintained, making it possible to provide a rotating electric machine 1 with good assembly properties.

[0043] In addition, in this embodiment 1, an example is shown in which four first core laminations 111, one second core lamination 112, 37 third core laminations 110, one second core lamination 112, and four first core laminations 111 are stacked from the bottom in the axial direction Z, and the second core laminations 112 are arranged so as to be in contact with the first core laminations 111, but this is not limited to this, and for example, the second core laminations 112 may be arranged near the center of the laminated core 11 in the axial direction Z, as shown in Figure 20, and the same effect as in embodiment 1 above can be obtained.

[0044] In addition, in the present embodiment 1, the first core laminations 111 are arranged at the upper and lower ends of the laminated core 11 in the axial direction Z, but they do not necessarily have to be arranged at the upper and lower ends in the axial direction Z. For example, the upper and lower ends may be arranged with the third core laminations 110 or electromagnetic steel sheets of other shapes, and the installation positions of the first core laminations 111 and the second core laminations 112 can be changed appropriately depending on the required accuracy of arranging the magnets 12, thereby obtaining the same effects as in the above embodiment 1.

[0045] According to the rotating electric machine of the first embodiment configured as described above, A rotation axis; a rotor having a laminated core fixed to the rotating shaft and having a plurality of core pieces, each made of a plurality of electromagnetic steel plates, laminated in the axial direction, and a plurality of magnets arranged at intervals in the circumferential direction on the outer periphery of the laminated core; a stator disposed apart from the rotor and surrounding the rotor, The core pieces include a first core piece and a second core piece, The first core piece has a positioning protrusion that protrudes radially outward to position one end of the magnet in the circumferential direction, The second core piece has a movable protrusion that protrudes radially outward and presses the other circumferential end of the magnet toward one circumferential end of the magnet, Since the magnets can be installed using the positioning protrusions and the movable protrusions, there is no need to arrange adjacent magnets side by side with a space between the fixed protrusions and the movable protrusions as in conventional rotating electric machines. In other words, the magnets can be spaced closer together, making it possible to provide a rotating electric machine that is small and has high drive efficiency. In addition, when installing the magnets in the laminated core, no temporary holding tool is required to harden the adhesive used to adhere the magnets, and there is no need to attach or remove the temporary holding tool. This makes it possible to provide a rotating electric machine with excellent workability.

[0046] Furthermore, according to the rotating electric machine of the first embodiment configured as described above, The other ends of all the magnets in the circumferential direction are pressed toward one end in the circumferential direction by the movable protrusion. Since all magnets can be securely pressed against the positioning protrusions, the magnets can be positioned with high precision.

[0047] Furthermore, according to the rotating electric machine of the first embodiment configured as described above, The movable protrusion and the positioning protrusion are formed at positions where they partially overlap when viewed from the axial direction. Since the distance between adjacent magnets in the circumferential direction can be narrowed, a rotating electric machine can be provided that is small in size, makes effective use of magnetic force, and has high drive efficiency.

[0048] Furthermore, according to the rotating electric machine of the first embodiment configured as described above, The first core pieces are disposed on both sides of the laminated core in the axial direction, Since the first core pieces are arranged on both sides in the axial direction and the magnets can be fixed on both sides in the axial direction, the magnets do not tilt in the axial direction and can be arranged with higher precision.

[0049] Furthermore, according to the rotating electric machine of the first embodiment configured as described above, The second core pieces are disposed between the first core pieces disposed on both sides in the axial direction, Since the second core pieces are arranged between the first core pieces in the axial direction, the force point which is the pressing force of the movable protrusion part of the second core piece acts between the fulcrums of the positioning protrusion parts of the first core pieces on both sides in the axial direction, so that the magnet can be reliably pressed against the positioning protrusion parts without separating from the positioning protrusion parts of the first core pieces, and can be positioned with high precision.

[0050] Furthermore, according to the rotating electric machine of the first embodiment configured as described above, The number of the first core laminations is greater than the number of the second core laminations, When inserting the magnet, the elastic deformation of the movable protrusion places a small load in the circumferential direction, so that the insertion force for inserting the magnet can be reduced and made easier. The rigidity of the positioning protrusion can be made sufficiently higher than the rigidity of the movable protrusion. As a result, even if a pressing force from the magnet is applied to the positioning protrusion via the movable protrusion, and an insertion force when assembling the magnet is applied, the positioning protrusion does not deform, and high magnet positioning accuracy can be obtained. As a result, a rotating electric machine with good characteristics that suppress the generation of torque ripple or cogging torque can be provided.

[0051] Furthermore, according to the rotating electric machine of the first embodiment configured as described above, Since third core laminations, which do not have the movable protrusions and the positioning protrusions, are laminated on locations other than the first core laminations and the second core laminations, Since a third core piece is used that does not have a movable protrusion and a positioning protrusion, the amount of material can be reduced, resulting in low costs.

[0052] Furthermore, according to the rotating electric machine of the first embodiment configured as described above, The second core pieces are provided with notches extending radially inward on both circumferential sides of the movable protrusion, The length of the movable protrusion of the second core lamination can be adjusted by the notches, so the movable protrusion can be deformed in the circumferential direction with the minimum necessary force, and the elastic range can be increased. In other words, the magnet insertion force can be minimized, and the magnet can be held in place by optimal elastic deformation. This makes it possible to provide a rotating electric machine with stable magnet holding force and good magnet assemblyability.

[0053] Furthermore, according to the rotating electric machine of the first embodiment configured as described above, a radially outermost position of the positioning protrusion is formed at a radially inner position than a radially outermost position of the movable protrusion when viewed from the axial direction, The movable protrusion is provided with a lead-in taper portion at a radial tip side of the side pressing the magnet in the circumferential direction, the lead-in taper portion being inclined toward the side opposite to the side pressing the magnet in the circumferential direction. When inserting the magnet, the magnet can be inserted along the leading tapered portion of the movable protrusion without abutting against the outermost formed position on the radial outside of the movable protrusion, so that the magnet can be inserted reliably, buckling of the movable protrusion can be prevented, and a rotating electric machine with good assembly properties can be provided.

[0054] Furthermore, according to the rotating electric machine of the first embodiment configured as described above, The thickness of the movable protrusion of the second core lamination is Since the second core lamination is formed thinner than the plate thickness of the portion other than the movable protrusion, Since the movable protrusion is less likely to come into contact with the other core pieces stacked above and below the second core piece in the axial direction, the elastic deformation of the movable protrusion is possible without circumferential friction. As a result, the pressing force of the magnet is stable and can be maintained, making it possible to provide a rotating electric machine with good assembly properties.

[0055] Embodiment 2 Fig. 21 is a perspective view showing the configuration of a rotor and a rotating shaft of a rotating electric machine according to embodiment 2. Fig. 22 is a perspective view showing the configuration before magnets are installed in the rotor shown in Fig. 16. In the figure, parts similar to those in embodiment 1 above are omitted by assigning the same reference numerals.

[0056] As shown in Fig. 22, in the present embodiment 2, a case will be described in which a multi-stage skew structure in which a plurality of laminated cores 11 are used in a rotating electric machine 1 will be described. The laminated cores 11 described in the above embodiment 1 are stacked in two stages in the axial direction Z on the rotating shaft 10 and press-fitted and fixed with a predetermined angle offset in the circumferential direction. The method of assembling the laminated cores 11 and magnets 12 is the same as in the above embodiment 1, and therefore description thereof will be omitted where appropriate.

[0057] Before attaching the magnet 12 to the laminated core 11, an adhesive is applied to the outer peripheral surface 11A of the laminated core 11 in advance. Then, the multiple magnets 12 are inserted in order onto the outer peripheral surface 11A of the laminated core 11. When the magnet 12 is in close contact with the outer peripheral surface 11A of the laminated core 11, the magnet 12 is pressed against the reference protrusion 11C by the movable protrusion 112C and also against the outer peripheral surface 11A, so that the position of the magnet 12 is maintained.

[0058] In this state, the adhesive is hardened to obtain rotor 14 as shown in FIG. 21. In rotor 14, multiple magnets 12 are fixed to multiple laminated cores 11 with high precision. As described above, in rotor 14 having a step-skew structure, multiple magnets 12 can be easily fixed even if the number of laminated cores 11 and the number of magnets 12 are increased. No temporary holding jig is required to harden the adhesive used to adhere magnets 12, and there is no need to attach or remove the temporary holding jig. Therefore, a rotating electric machine 1 with even better assembly workability can be provided.

[0059] According to the rotating electric machine of the second embodiment configured as described above, the same effects as those of the first embodiment can be obtained, and in addition, The laminated core is provided in a plurality of layers. The plurality of laminated cores are disposed on the rotating shaft so as to be shifted from one another in the circumferential direction. Even if the number of laminated cores is increased, multiple magnets can be easily fixed to each laminated core. Furthermore, there is no need for a temporary holding jig to harden the adhesive used to adhere the magnets, and there is no need to attach or remove the temporary holding jig, so a rotating electric machine with good assembly workability can be provided even if the number of laminated cores and magnets is increased.

[0060] An example of the hardware of the control device 18 shown in the above embodiment is configured with a processor 100 and a storage device 101, as shown in FIG. 23. Although the storage device is not shown, it includes a volatile storage device such as a random access memory, and a non-volatile auxiliary storage device such as a flash memory. Also, instead of the flash memory, an auxiliary storage device such as a hard disk may be provided. The processor 100 executes a program input from the storage device 101. In this case, the program is input from the auxiliary storage device to the processor 100 via the volatile storage device. Also, the processor 100 may output data such as a calculation result to the volatile storage device of the storage device 101, or may store the data in the auxiliary storage device via the volatile storage device.

[0061] Although the present application describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless modifications not exemplified are assumed within the scope of the technology disclosed in this application, including, for example, modifying, adding, or omitting at least one component, and further, extracting at least one component and combining it with a component of another embodiment.

[0062] Various aspects of the present disclosure are summarized below as appendices.

[0063] (Appendix 1) A rotation axis; a rotor having a laminated core fixed to the rotating shaft and having a plurality of core pieces, each made of a plurality of electromagnetic steel plates, laminated in the axial direction, and a plurality of magnets arranged at intervals in the circumferential direction on the outer periphery of the laminated core; a stator disposed apart from the rotor and surrounding the rotor, The core pieces include a first core piece and a second core piece, The first core piece has a positioning protrusion that protrudes radially outward to position one end of the magnet in the circumferential direction, The second core piece has a movable protrusion that protrudes radially outward and presses the other circumferential end of the magnet toward one circumferential end of the magnet. (Appendix 2) 2. The rotating electric machine according to claim 1, wherein the other circumferential ends of all of the magnets are pressed toward one circumferential end by the movable protrusion. (Appendix 3) The rotating electric machine according to claim 1 or 2, wherein the movable protrusion and the positioning protrusion are formed at positions where they partially overlap when viewed from the axial direction. (Appendix 4) 4. The rotating electric machine according to claim 1, wherein the first core laminations are disposed on both sides of the laminated core in an axial direction. (Appendix 5) 5. The rotating electric machine according to claim 4, wherein the second core laminations are arranged between the first core laminations arranged on both sides in the axial direction. (Appendix 6) 6. The rotating electric machine according to claim 1, wherein the number of laminations of the first core laminations is greater than the number of laminations of the second core laminations. (Appendix 7) A rotating electric machine as described in any one of Supplementary Note 1 to Supplementary Note 6, wherein third core laminations, in which the movable protrusions and the positioning protrusions are not formed, are stacked in locations other than the first core laminations and the second core laminations. (Appendix 8) The rotating electric machine according to any one of claims 1 to 7, wherein the second core laminations are provided with notches extending radially inward on both circumferential sides of the movable protrusion. (Appendix 9) a radially outermost position of the positioning protrusion is formed at a radially inner position than a radially outermost position of the movable protrusion when viewed from the axial direction, 9. The rotating electric machine according to any one of Supplementary Note 1 to Supplementary Note 8, wherein the movable protrusion portion is provided with an introduction taper portion at a radial tip side of a side that presses the magnet in the circumferential direction, the introduction taper portion inclining toward a side opposite to the side that presses the magnet in the circumferential direction. (Appendix 10) The thickness of the movable protrusion of the second core lamination is 10. The rotating electric machine according to claim 1, wherein the second core lamination is formed to have a thickness smaller than a thickness of a portion of the second core lamination other than the movable protrusion. (Appendix 11) The laminated core is provided in a plurality of layers. 11. The rotating electric machine according to claim 1, wherein the laminated cores are arranged on the rotating shaft so as to be shifted from each other in a circumferential direction. [Explanation of symbols]

[0064] 1 rotating electric machine, 10 rotating shaft, 100 processor, 101 storage device, 11 laminated core, 11A outer peripheral surface, 11B through hole, 110 third core piece, 110A outer circumferential surface, 110B through hole, 110C notch, 111 first core piece, 11A outer peripheral surface, 111B through hole, 111C positioning protrusion, 111D positioning surface, 111E non-positioning surface, 112 second core piece, 112A outer surface, 112B through hole, 112C movable protrusion, 112D end, 112E introduction taper portion, 112F notch portion, 112G notch portion, 12 magnet, 12A cylindrical surface, 12B installation surface, 12C second side surface, 12D first side surface, 14 rotor, 15 joint, 16 heat sink, 17 sensor, 18 control device, 2 frame, 3 stator, 4 insulator, 5 stator winding, 6 terminal, 7 bearing, 8 bearing holder, 9 bearing, Z-axis direction.

Claims

1. A rotation axis; a rotor having a laminated core fixed to the rotating shaft and having a plurality of core pieces, each made of a plurality of electromagnetic steel plates, laminated in the axial direction, and a plurality of magnets arranged at intervals in the circumferential direction on the outer periphery of the laminated core; a stator disposed apart from the rotor and surrounding the rotor, The core pieces include a first core piece and a second core piece, The first core piece has a positioning protrusion that protrudes radially outward to position one end of the magnet in the circumferential direction, The second core piece has a movable protrusion that protrudes radially outward and presses the other circumferential end of the magnet toward one circumferential end of the magnet.

2. 2 . The rotating electric machine according to claim 1 , wherein the other circumferential ends of all of the magnets are pressed toward one circumferential end by the movable protrusion.

3. 3. The rotating electric machine according to claim 1, wherein the movable protrusion and the positioning protrusion are formed at positions where they partially overlap when viewed in the axial direction.

4. 3. The rotating electric machine according to claim 1, wherein the first core laminations are disposed on both sides of the laminated core in an axial direction.

5. The rotating electric machine according to claim 4 , wherein the second core laminations are arranged between the first core laminations arranged on both sides in the axial direction.

6. 3. The rotating electric machine according to claim 1, wherein a number of the first core laminations is greater than a number of the second core laminations.

7. 3. The rotating electric machine according to claim 1, wherein third core laminations, on which the movable protrusions and the positioning protrusions are not formed, are stacked at locations other than the first core laminations and the second core laminations.

8. 3. The rotating electric machine according to claim 1, wherein the second core laminations are provided with notches extending radially inward on both circumferential sides of the movable protrusion.

9. a radially outermost position of the positioning protrusion is formed at a radially inner position than a radially outermost position of the movable protrusion when viewed from the axial direction, 3. A rotating electric machine according to claim 1, wherein the movable protrusion has an inlet taper portion at a radial tip side of the side pressing the magnet in the circumferential direction, the inlet taper portion inclining toward a side opposite to the side pressing the magnet in the circumferential direction.

10. The plate thickness of the movable protrusion portion of the second core lamination is 3. The rotating electric machine according to claim 1, wherein the second core lamination is formed to have a thickness smaller than a thickness of a portion other than the movable protrusion portion.

11. The laminated core is provided in a plurality of layers.

3. The rotating electric machine according to claim 1, wherein the laminated cores are arranged on the rotating shaft so as to be shifted from one another in a circumferential direction.

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