Rotor and Motor

Abstract

To provide a rotor and a motor in which inside positional displacement can be suppressed and leakage of a magnetic flux can be reduced.SOLUTION: In a rotor, an outer core 110 has multiple unit layers UL that are layered in the axial direction. Each of the unit layers includes a single magnetic pole steel plate 10a having one magnetic pole portion which is included in multiple magnetic pole portions Mp, and a connection magnetic pole steel plate 10b having two or more magnetic pole portions which are included in the magnetic pole portions and a connecting portion Cc connecting the two or more magnetic pole portions. In each unit layer, the single magnetic pole steel plate and the connection magnetic pole steel plate are arranged in the circumferential direction. Regarding two adjacent unit layers of the unit layers, the positions of the single magnetic pole steel plate and the connection magnetic pole steel plate of one of the adjacent unit layers are deviated in the circumferential direction from the positions of the single magnetic pole steel plate and the connection magnetic pole steel plate of the other unit layer.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a rotor and a motor. [Background technology]

[0002] IPM (Interior Permanent Magnetic) motors, which have permanent magnets mounted in the rotor core, are known. Compared to induction motors, IPM motors can be driven more efficiently because they do not generate loss due to secondary current.

[0003] In IPM motors, methods for preventing magnetic flux leakage from the rotor core and improving motor efficiency have been studied (see, for example, Patent Document 1). Patent Document 1 describes a rotor in which magnet storage holes formed in a row along the circumferential direction penetrate obliquely relative to the axial direction of the rotating shaft, and resin magnets are filled into the magnet storage holes by injection molding. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-144386 Summary of the Invention [Problem to be solved by the invention]

[0005] In the rotor of Patent Document 1, the rotor core is connected to the magnet housing hole on the radially inner side, so magnetic flux generated in the rotor flows through the connecting part, which can cause magnetic flux leakage. On the other hand, if the rotor core of the rotor is separated, the rigidity inside the rotor will decrease, and the position of the internal structure of the rotor may become misaligned.

[0006] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a rotor and a motor that can suppress internal positional deviation and reduce magnetic flux leakage. [Means for solving the problem]

[0007] An exemplary rotor according to the present invention includes an outer core having a plurality of magnetic pole portions arranged in the circumferential direction, an inner core located radially inward of the outer core, magnets arranged in gaps between adjacent magnetic pole portions of the plurality of magnetic pole portions, and a resin portion covering the outer core, the inner core, and the magnets. The outer core has a plurality of unit layers stacked along the axial direction. Each of the plurality of unit layers includes a single-pole steel plate having one magnetic pole portion included in the plurality of magnetic pole portions, and a connecting pole steel plate having two or more magnetic pole portions included in the plurality of magnetic pole portions and a connecting portion connecting the two or more magnetic pole portions. In the unit layers, the single-pole steel plate and the connecting pole steel plate are arranged in the circumferential direction, and in two adjacent unit layers of the plurality of unit layers, the positions of the single-pole steel plate and the connecting pole steel plate in one unit layer are shifted in the circumferential direction relative to the positions of the single-pole steel plate and the connecting pole steel plate in the other unit layer.

[0008] An exemplary motor of the present invention includes the rotor described above. [Effects of the Invention]

[0009] According to the exemplary embodiment of the present invention, it is possible to provide a rotor and a motor that can suppress internal positional deviation and reduce magnetic flux leakage. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic cross-sectional view of a motor according to one embodiment of the present invention. [Figure 2] FIG. 2 is a schematic perspective view of a rotor according to one embodiment of the present invention. [Figure 3A] FIG. 3A is a schematic perspective view of an outer core, an inner core, and a magnet in a rotor according to one embodiment of the present invention. [Figure 3B]FIG. 3B is a schematic plan view of the outer core, the inner core, and the magnet in the rotor according to one embodiment of the present invention. [Figure 4] FIG. 4 is a schematic exploded perspective view of a plurality of unit layers of an outer core in a rotor according to one embodiment of the present invention. [Figure 5A] FIG. 5A is a schematic plan view of a single-pole steel plate in a rotor according to one embodiment of the present invention. [Figure 5B] FIG. 5B is a schematic plan view of a connecting pole steel plate in a rotor according to an embodiment of the present invention. [Figure 6] FIG. 6 is a schematic perspective view of an outer core, an inner core, and a magnet in a rotor according to an embodiment of the present invention. [Figure 7] FIG. 7 is a schematic exploded perspective view of a plurality of unit layers of an outer core in a rotor according to one embodiment of the present invention. [Figure 8A] FIG. 8A is a schematic plan view of a first single-pole steel plate in a rotor according to one embodiment of the present invention. [Figure 8B] FIG. 8B is a schematic plan view of a second single-pole steel plate in a rotor according to an embodiment of the present invention. [Figure 8C] FIG. 8C is a schematic plan view of a first linking pole steel plate in a rotor according to an embodiment of the present invention. [Figure 8D] FIG. 8D is a schematic plan view of a second link pole steel plate in a rotor according to an embodiment of the present invention. [Figure 9A] FIG. 9A is a partially enlarged view of FIG. [Figure 9B] FIG. 9B is an enlarged view of a portion of FIG. 9A. [Figure 9C] FIG. 9C is a schematic plan view of a second single-pole steel plate and a magnet in a rotor according to an embodiment of the present invention. [Figure 10A] FIG. 10A is a schematic plan view of an outer core, an inner core, a magnet, and an elastic body in a rotor according to one embodiment of the present invention. [Figure 10B]FIG. 10B is a schematic plan view of the outer core, the inner core, the magnet, and the resin coating portion in the rotor according to one embodiment of the present invention. [Figure 11] FIG. 11 is a schematic perspective view of an outer core, an inner core, and a magnet in a rotor according to one embodiment of the present invention. [Figure 12] FIG. 12 is a schematic exploded perspective view of a plurality of unit layers of an outer core in a rotor according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference characters and description thereof will not be repeated.

[0012] For convenience, the direction of the motor's central axis AX (see FIG. 1 ) may be referred to as the up-down direction in this specification. For ease of understanding, the X-, Y-, and Z-axes of a three-dimensional Cartesian coordinate system are also indicated appropriately in the figures. The positive direction of the Z-axis indicates the upward direction, and the negative direction of the Z-axis indicates the downward direction. However, the up-down, upward, and downward directions are defined for convenience of explanation and do not necessarily correspond to the vertical direction. Furthermore, the up-down direction is defined merely for convenience of explanation and does not limit the orientation of the motor according to the present invention during use or assembly. Furthermore, the direction parallel to the motor's central axis AX will be referred to simply as the "axial direction AD," and the radial and circumferential directions centered on the motor's central axis AX will be referred to simply as the "radial direction RD" and the "circumferential direction CD." Furthermore, "planar view" refers to viewing an object from the axial direction AD. In this specification, "parallel direction" also includes a substantially parallel direction.

[0013] A motor 400 and rotor 100 according to an embodiment of the present invention will be described with reference to FIG. 1. FIG. 1 is a cross-sectional view showing the structure of motor 400 according to an embodiment of the present invention. Motor 400 is used in home appliances such as air conditioners and washing machines. However, motor 400 according to the present invention may also be used for applications other than home appliances. For example, motor 400 according to the present invention may be mounted on transportation equipment such as automobiles or trains, office automation equipment, medical equipment, tools, large industrial equipment, and the like, to generate various driving forces.

[0014] As shown in FIG. 1, the motor 400 includes a rotor 100, a stator 200, a shaft SH, a first cover member 312, a first bearing 314, a second cover member 320, a second bearing 324, a casing 330, and a circuit board 340.

[0015] The rotor 100 is disposed about a central axis AX extending in the vertical direction. As an example, the motor 400 is an inner rotor type motor. The rotor 100 rotates about the central axis AX. The rotor 100 is disposed radially inward of the stator 200 in the radial direction RD.

[0016] The rotor 100 includes an outer core 110, an inner core 120, a magnet 130, and a resin portion 140. The magnet 130 is, for example, a plate-shaped permanent magnet formed by sintering. However, the magnet 130 may also be a permanent magnet molded from a plastic magnet in which magnetic powder is mixed into a resin material. For example, the rotor 100 may have a single, substantially annular magnet 130, or may have multiple magnets 130 arranged in the circumferential direction CD. "Substantially annular" means, for example, "substantially circular annular."

[0017] The outer core 110 is made of, for example, electromagnetic steel sheets stacked in the axial direction AD. The magnets 130 are arranged in the gaps between the magnetic pole portions of the outer core 110. In this embodiment, the rotor 100 is a spoke-type rotor.

[0018] The shaft SH is disposed about the central axis AX. The shaft SH is generally columnar. The shaft SH is fixed by passing through a shaft through-hole 120h formed in the inner core 120. Therefore, the shaft SH rotates together with the rotor 100 about the central axis AX.

[0019] The resin portion 140 covers the outer core 110, the inner core 120, and the magnet 130 from both sides in the axial direction AD. Furthermore, the resin portion 140 covers the outer side of the magnet 130 in the radial direction RD. The resin portion 140 may include plastic. Alternatively, the resin portion 140 may include rubber or elastomer. In particular, the resin portion 140 fixes the outer core 110, the inner core 120, and the magnet 130 by insert molding.

[0020] Here, the resin part 140 has an elastic body 142 interposed between the inner core 120 and the outer core 110. The elastic body 142 covers the magnet 130 and a portion of each of the outer core 110 and the inner core 120. More specifically, the elastic body 142 covers the axial AD end, both circumferential CD ends, and the inner radial RD end of the magnet 130 on the inner core 120 side.

[0021] Resin part 140 further includes a coating resin part 144. Coating resin part 144 covers the magnet 130 and the axial AD end of outer core 110, except for the part covered by elastic body 142, and the outer peripheral surface.

[0022] The first cover member 312 is disposed at an upper portion in the axial direction AD of the motor 400. The first cover member 312 covers an upper portion of the casing 330 in the axial direction AD.

[0023] The first cover member 312 has a cylindrical first bearing holder 312a and a through hole formed in the center of the first bearing holder 312a. The shaft SH passes through the through hole. The first bearing holder 312a holds a first bearing 314. The first bearing 314 rotatably supports the shaft SH. The first bearing 314 is, for example, a rolling bearing. At least a portion of the first cover member 312 is attached to the casing 330 by insert molding.

[0024] The second cover member 320 is disposed at a lower portion in the axial direction AD of the motor 400. The second cover member 320 covers a lower portion of the casing 330 in the axial direction AD.

[0025] The second cover member 320 has a cylindrical second bearing holder 322a. The second bearing 324 rotatably supports the shaft SH. The second bearing 324 is, for example, a rolling bearing. The second cover member 320 is fixed to the casing 330 by fitting. The second bearing holder 322a holds the second bearing 324. The second bearing holder 322a has a generally cylindrical shape with a bottom and a hole in the center.

[0026] The stator 200 is disposed about a central axis AX extending in the up-down direction. The stator 200 faces the magnet 130 in the radial direction RD. The stator 200 has a stator core 210, an insulator 220, and a coil 230.

[0027] Coil 230 is formed by winding a conductor around stator core 210 via insulator 220. Typically, the conductor is a coated conductor in which a metal wire is coated with a coating. The material of the metal wire is, for example, aluminum. However, the material of the metal wire may be copper instead of aluminum. The coating that coats the metal wire is, for example, an insulating resin. The resin material is, for example, enamel. Insulator 220 electrically insulates stator core 210 and coil 230. Insulator 220 is made of an insulating material. Insulator 220 is made of, for example, a thermoplastic resin.

[0028] Stator core 210 is disposed about a central axis AX extending in the vertical direction. As an example, stator core 210 is disposed around central axis AX and is generally annular. "Regular annular" means, for example, "generally circular annular." Stator core 210 is formed, for example, from electromagnetic steel sheets in which thin electromagnetic steel sheets are stacked in the axial direction AD. Stator core 210 has a core back and a plurality of teeth.

[0029] Insulator 220 covers at least a portion of stator core 210. As an example, insulator 220 is disposed around central axis AX and has a substantially annular shape. "Substantially annular" means, for example, "substantially circular ring shape." Insulator 220 is an electrical insulator. Insulator 220 may be formed of a single member, or may be formed of multiple separate members. For example, insulator 220 is a resin molded product into which stator core 210 is inserted. Insulator 220 may also have a structure that is separately attached to stator core 210.

[0030] The casing 330 accommodates at least a portion of the rotor 100 and the stator 200. Specifically, the casing 330 has an opening that opens upward in the axial direction AD. The casing 330 is a substantially cylindrical member with a bottom, and is made of a thermosetting resin. "Substantially cylindrical with a bottom" means, for example, "substantially cylindrical with a bottom." The casing 330 is obtained by pouring resin into a mold into which the stator 200 is inserted. In other words, the casing 330 is a resin-molded product into which the stator 200 is inserted. Therefore, the stator 200 is fixed by the casing 330. The second bearing holder 322a is fixed to the bottom of the casing 330 in the axial direction AD.

[0031] The casing 330 covers at least the outer surface of the stator core 210 in the radial direction RD. For example, the casing 330 is formed from a resin. At least the inner surface of the stator core 210 in the radial direction RD, i.e., the inner surfaces of the multiple teeth in the radial direction RD, are exposed from the casing 330. The casing 330 also houses at least a portion of the rotor 100.

[0032] The circuit board 340 is housed within the casing 330. Electronic components are mounted on the circuit board 340. The electronic components include an element for controlling the amount of current flowing through the coil 230 and an element for detecting the rotational position of the rotor 100.

[0033] Next, a rotor 100 according to an embodiment of the present invention will be described with reference to Figures 1 and 2. Figure 2 is a schematic perspective view of the rotor 100 according to an embodiment of the present invention.

[0034] As shown in FIG. 1, the rotor 100 includes an outer core 110, an inner core 120, a magnet 130, and a resin portion 140.

[0035] As shown in FIG. 2, the outer core 110 extends annularly in the circumferential direction CD. The outer core 110 is located radially outward from the inner core 120 in the circumferential direction RD. The outer core 110 has a plurality of magnetic pole steel plates 10 arranged in the circumferential direction CD. The magnetic pole steel plates 10 are arranged along the circumferential direction CD. The magnetic pole steel plates 10 are also stacked along the axial direction AD. Each of the plurality of magnetic pole steel plates 10 has at least one magnetic pole portion Mp. Therefore, the outer core 110 has a plurality of magnetic pole portions Mp arranged in the circumferential direction CD.

[0036] The inner core 120 is located radially inward in the RD direction of the outer core 110. A shaft SH (FIG. 1) is attached to the inner core 120. Here, a part of the inner core 120 on the shaft SH side is exposed.

[0037] The magnet 130 is disposed in a gap Ms provided between adjacent magnetic pole portions Mp among the plurality of magnetic pole portions Mp.

[0038] Thus, the rotor 100 comprises an outer core 110 having a plurality of magnetic pole portions Mp arranged in the circumferential direction CD, an inner core 120 located radially inward from the outer core 110 in the radial direction RD, a magnet 130 arranged in a gap portion Ms provided between adjacent magnetic pole portions Mp among the plurality of magnetic pole portions Mp, and a resin portion 140 covering the outer core 110, the inner core 120, and the magnet 130.

[0039] Next, a rotor 100 according to one embodiment of the present invention will be described with reference to Figures 1 to 3B. Figure 3A is a schematic perspective view of an outer core 110, an inner core 120, and a magnet 130 in the rotor 100 according to one embodiment of the present invention. Figure 3A is a view of the rotor 100 shown in Figure 2 with the resin part 140 removed. Figure 3B is a schematic plan view of the outer core 110, the inner core 120, and the magnet 130 in the rotor 100 according to one embodiment of the present invention.

[0040] As shown in FIG. 3A, the outer core 110 and the magnets 130 are arranged annularly along the circumferential direction CD. The outer core 110 has a plurality of magnetic pole steel plates 10. Each of the plurality of magnetic pole steel plates 10 has a magnetic pole portion Mp. The plurality of magnetic pole portions Mp are arranged in the circumferential direction CD. The plurality of magnetic pole portions Mp are also stacked in the axial direction AD. The outer core 110 has a plurality of unit layers UL stacked along the axial direction AD. As shown in FIG. 1, the length of the outer core 110 along the axial direction AD of the rotor 100 according to one embodiment of the present invention is greater than the length of the stator core 210 along the axial direction AD. However, depending on the specifications, the length of the outer core 110 along the axial direction AD may be approximately the same as the length of the stator core 210 along the axial direction AD, or may be smaller than the length of the stator core 210 along the axial direction AD.

[0041] The length of the magnet 130 along the axial direction AD is longer than the multiple unit layers UL of the outer core 110 stacked along the axial direction AD. In other words, the magnet 130 protrudes from both sides of the outer core 110 in the axial direction AD. Because the magnet 130 is long, the amount of magnetic flux increases according to the volume of the magnet 130, thereby increasing the torque of the motor 400. In addition, since the distance to the element that detects the rotational position of the rotor 100, which is provided on the circuit board 340, can be reduced, the accuracy of position detection during rotation of the rotor 100 can be improved.

[0042] Here, the magnetic pole portion Mp is substantially sector-shaped. The magnetic pole portion Mp may be provided with a hole he (FIG. 6). In this case, it is preferable to place a resin portion 140 (FIG. 2) in the hole of the magnetic pole portion Mp. This allows the resin portion 140 to firmly fix the magnetic pole portion Mp.

[0043] 3A and 3B, the inner core 120 is located radially inward of the outer core 110 and the magnet 130 in the radial direction RD. The outer core 110 and the inner core 120 are located apart from each other. The resin part 140 shown in FIG. 2 is interposed between the inner core 120 and the outer core 110.

[0044] The magnetic pole steel plate 10 includes a single magnetic pole steel plate 10a and a connecting magnetic pole steel plate 10b. The single magnetic pole steel plate 10a and the connecting magnetic pole steel plate 10b will be described in detail later.

[0045] The magnets 130 are arranged radially in the gaps Ms between adjacent magnetic pole portions Mp. The magnets 130 are arranged so that opposing surfaces have the same magnetic polarity. In this case, magnetic flux of the same polarity as the magnetic pole on the opposing surface of the magnet 130 flows through the magnetic pole portions Mp sandwiched between adjacent magnets 130. The magnetic flux of each magnetic pole portion Mp repels or attracts the magnetic field of the stator 200 (FIG. 1), causing the rotor 100 to rotate relative to the stator 200. Such a rotor 100 is also called a spoke rotor.

[0046] Next, the outer core 110 of the rotor 100 according to one embodiment of the present invention will be described with reference to Figures 1 to 4. Figure 4 is a schematic exploded perspective view of a plurality of unit layers UL of the outer core 110 of the rotor 100 according to one embodiment of the present invention.

[0047] As shown in FIG. 4, the outer core 110 has a plurality of unit layers UL. Here, each of the plurality of unit layers UL has a plurality of magnetic pole steel plates 10. In each unit layer UL, the plurality of magnetic pole steel plates 10 have a single magnetic pole steel plate 10a and a connecting magnetic pole steel plate 10b. The single magnetic pole steel plate 10a is a magnetic pole steel plate 10 having one magnetic pole portion Mp, and the connecting magnetic pole steel plate 10b is a magnetic pole steel plate 10 having two magnetic pole portions Mp. The connecting magnetic pole steel plate 10b has two magnetic pole portions Mp and a connecting portion Cc connecting the two magnetic pole portions Mp. Here, each of the plurality of unit layers UL has ten magnetic pole portions Mp.

[0048] 4 shows five unit layers UL, namely, unit layer ULa, unit layer ULb, unit layer ULc, unit layer ULd, and unit layer ULe. The unit layers ULa to ULe are stacked in order along the axial direction AD. Here, each of the unit layers ULa to ULe includes six single magnetic pole steel plates 10a and two connecting magnetic pole steel plates 10b.

[0049] In the unit layer ULa, a single magnetic pole steel plate 10a, a connecting magnetic pole steel plate 10b, three single magnetic pole steel plates 10a, a connecting magnetic pole steel plate 10b and two single magnetic pole steel plates 10a are arranged in this order clockwise from the reference position Pa along the circumferential direction CD.

[0050] In the unit layer ULb, one magnetic pole portion Mp of the connecting magnetic pole steel plate 10b, three single magnetic pole steel plates 10a, the connecting magnetic pole steel plate 10b, the three single magnetic pole steel plates 10a, and the other magnetic pole portion Mp of the connecting magnetic pole steel plate 10b are arranged in order from the reference position Pb clockwise along the circumferential direction CD.

[0051] In the unit layer ULc, two single magnetic pole steel plates 10a, a connecting magnetic pole steel plate 10b, three single magnetic pole steel plates 10a, a connecting magnetic pole steel plate 10b and one single magnetic pole steel plate 10a are arranged in this order clockwise from the reference position Pc along the circumferential direction CD.

[0052] In the unit layer ULd, a connection pole steel plate 10b, three single pole steel plates 10a, a connection pole steel plate 10b and three single pole steel plates 10a are arranged in this order clockwise from the reference position Pd along the circumferential direction CD.

[0053] In the unit layer ULe, three single magnetic pole steel plates 10a, a connecting magnetic pole steel plate 10b, three single magnetic pole steel plates 10a and a connecting magnetic pole steel plate 10b are arranged in this order clockwise from the reference position Pe along the circumferential direction CD.

[0054] 4, the unit layer UL following the unit layer ULe is omitted. In the unit layer following the unit layer ULe, a single magnetic pole steel plate 10a and a connection magnetic pole steel plate 10b are arranged, similar to the unit layer ULa. Then, a single magnetic pole steel plate 10a and a connection magnetic pole steel plate 10b are arranged, similar to the unit layers ULb to ULe.

[0055] Here, when attention is paid to the arrangement of the connection pole steel plates 10b relative to the reference positions Pa to Pe in the unit layers ULa to ULe, the connection pole steel plates 10b are located at positions rotated 72° counterclockwise for each unit layer UL. Similarly, in the unit layers ULa to ULe, the single pole steel plates 10a are also located at positions rotated 72° counterclockwise for each unit layer UL. In other words, the arrangement of the single pole steel plates 10a and connection pole steel plates 10b in the unit layers ULa to ULe is repeated in multiple unit layers UL.

[0056] As described above, the outer core 110 has a plurality of unit layers UL stacked along the axial direction AD. Each of the plurality of unit layers UL has a single magnetic pole steel plate 10a having one magnetic pole portion Mp included in the plurality of magnetic pole portions Mp, and a connecting magnetic pole steel plate 10b having two or more magnetic pole portions Mp included in the plurality of magnetic pole portions Mp and a connecting portion Cc connecting the two or more magnetic pole portions Mp. In the unit layer UL, the single magnetic pole steel plate 10a and the connecting magnetic pole steel plate 10b are arranged in the circumferential direction CD. In two adjacent unit layers UL among the plurality of unit layers UL, the positions of the single magnetic pole steel plate 10a and the connecting magnetic pole steel plate 10b in one unit layer UL are shifted in the circumferential direction CD relative to the positions of the single magnetic pole steel plate 10a and the connecting magnetic pole steel plate 10b in the other unit layer UL.

[0057] In two adjacent unit layers UL among the stacked multiple unit layers UL, the single magnetic pole steel plate 10a including one magnetic pole portion Mp and the linked magnetic pole steel plate 10b having two or more linked magnetic pole portions Mp are stacked with the positions thereof shifted in the circumferential direction CD, thereby making it possible to prevent the entire outer core 110 from being misaligned when the outer core 110, along with the inner core 120 and the magnet 130, is covered with the resin part 140. Furthermore, because the magnetic pole portions Mp of the unit layers UL are not connected all around in the circumferential direction CD and the linked portions of the linked magnetic pole steel plates 10b in the stacked unit layers UL are not connected in the axial direction AD, leakage of magnetic flux flowing through the linked portions Cc can be reduced.

[0058] Next, the single-pole steel plate 10a and the connecting-pole steel plate 10b of the outer core 110 in the rotor 100 according to one embodiment of the present invention will be described with reference to Figures 1 to 5B. Figure 5A is a schematic plan view of the single-pole steel plate 10a in the rotor 100 according to one embodiment of the present invention. Figure 5B is a schematic plan view of the connecting-pole steel plate 10b in the rotor 100 according to one embodiment of the present invention.

[0059] 5A, the single-pole steel plate 10a has one magnetic pole portion Mp, which is a thin plate having a substantially sector shape.

[0060] The single-pole steel plate 10a may further have a circumferential protrusion Cp. The circumferential protrusion Cp protrudes clockwise and counterclockwise from the magnetic pole portion Mp outward in the circumferential direction CD on the radially outer side of the magnetic pole portion Mp in the radial direction RD. The circumferential protrusion Cp restricts the magnet 130 from moving outward in the radial direction RD.

[0061] 5B, the connecting magnetic pole steel plate 10b has two magnetic pole portions Mp and a connecting portion Cc. Here, one of the two magnetic pole portions Mp is referred to as magnetic pole portion Mpa, and the other magnetic pole portion Mp is referred to as magnetic pole portion Mpb. Specifically, the magnetic pole portion Mpa is located counterclockwise relative to the magnetic pole portion Mpb, and the magnetic pole portion Mpb is located counterclockwise relative to the magnetic pole portion Mpa.

[0062] The magnetic pole portions Mpa and Mpb are thin plates having a generally sector shape. The magnetic pole portions Mpa and Mpb of the linked magnetic pole steel plate 10b preferably have the same configuration as the magnetic pole portion Mp of the single magnetic pole steel plate 10a.

[0063] The connecting portion Cc connects the magnetic pole portion Mpa and the magnetic pole portion Mpb. The connecting portion Cc connects the radially inner portions of the magnetic pole portion Mpa and the magnetic pole portion Mpb. The connecting portion Cc extends in the circumferential direction CD between the radially inner portions of the magnetic pole portion Mpa and the magnetic pole portion Mpb.

[0064] The connecting pole steel plate 10b may further have a circumferential protrusion Cp. The circumferential protrusion Cp protrudes clockwise and counterclockwise from the magnetic pole portion Mp toward the outside in the circumferential direction CD on the radially outer side of the magnetic pole portion Mpa and the magnetic pole portion Mpb, respectively.

[0065] 3A to 5B, the unit layer UL has two types of magnetic pole steel plates 10 (single magnetic pole steel plates 10a and connecting magnetic pole steel plates 10b), but this embodiment is not limited to this. The unit layer UL may have three or more types of magnetic pole steel plates 10. In addition, the magnetic pole steel plates 10 may have protrusions that protrude inward in the radial direction RD.

[0066] Next, the rotor 100 of this embodiment will be described with reference to Figures 6 to 10. Figure 6 is a schematic perspective view of the outer core 110, the inner core 120, and the magnet 130 in the rotor 100 according to one embodiment of the present invention. Like Figure 3A, Figure 6 shows the rotor 100 with the resin portion 140 removed. The rotor 100 in Figure 6 has the same configuration as the rotor 100 shown in Figure 3A, except that the outer core 110 further has radial protrusions that protrude inward in the radial direction RD relative to the magnetic pole portions Mp, and therefore, redundant description will be omitted to avoid redundancy.

[0067] As shown in FIG. 6, the rotor 100 includes an outer core 110, an inner core 120, and a magnet .

[0068] The outer core 110 has a plurality of magnetic pole steel plates 10. The plurality of magnetic pole steel plates 10 are arranged along the circumferential direction CD. The plurality of magnetic pole steel plates 10 are also stacked along the axial direction AD. Each of the plurality of magnetic pole steel plates 10 has at least one magnetic pole portion Mp. Therefore, the outer core 110 has a plurality of magnetic pole portions Mp.

[0069] The magnetic pole portion Mp has a substantially sector shape. Here, some of the multiple magnetic pole steel plates 10 have radial protrusions on the inside in the radial direction RD relative to the magnetic pole portion Mp. The radial protrusions of the magnetic pole steel plates 10 will be described in detail later.

[0070] The magnetic pole portions Mp are provided with holes he. In the stacked magnetic pole portions Mp, the holes he of the multiple magnetic pole portions Mp are preferably arranged linearly along the axial direction AD. In this case, the resin portions 140 are arranged in the holes he of the magnetic pole portions Mp, and the coated resin portions 144 on both ends of the rotor 100 in the axial direction AD are connected to each other, allowing the resin portions 140 to firmly fix the magnetic pole portions Mp.

[0071] The inner core 120 has a main body 122 and a radial protrusion 124 that protrudes outward in the radial direction RD from the main body 122. The main body 122 has a cylindrical shape. The length (height) of the main body 122 along the axial direction AD is approximately equal to the length (height) of the outer core 110 along the axial direction AD.

[0072] Here, the radial protrusions 124 extend in the radial direction RD from the main body portion 122. The radial protrusions 124 extend outward in the radial direction RD from the main body portion 122 at equal intervals in five directions. The radial protrusions 124 also extend in the axial direction AD. The radial protrusions 124 are a single member together with the main body portion 122. The inner core 120 is covered by the resin portion 140 by insert molding. The radial protrusions 124 form wedges within the resin portion 140, preventing the inner core 120 and the outer core 110 from shifting in their relative positions.

[0073] Here, a hole 124h is provided in the radial protrusion 124. The hole 124h of the radial protrusion 124 preferably extends linearly along the axial direction AD. In this case, by arranging the resin part 140 in the hole 124h of the radial protrusion 124, the resin part 140 can firmly fix the inner core 120.

[0074] Next, the outer core 110 of the rotor 100 according to one embodiment of the present invention will be described with reference to Figures 6 and 7. Figure 7 is a schematic exploded perspective view of a plurality of unit layers UL of the outer core 110 of the rotor 100 according to one embodiment of the present invention.

[0075] 7, the outer core 110 has a plurality of unit layers UL. Here, each of the plurality of unit layers UL has a single magnetic pole steel plate 10a and a connecting magnetic pole steel plate 10b. In the outer core 110, at least one of the single magnetic pole steel plate 10a and the connecting magnetic pole steel plate 10b has a radial protrusion Rp that protrudes from the magnetic pole portion Mp toward the inner core 120 beyond the connecting portion Cc.

[0076] Here, the single-pole steel plate 10a includes a first single-pole steel plate 10a1 and a second single-pole steel plate 10a2. The first single-pole steel plate 10a1 is a pole steel plate 10 having one magnetic pole portion Mp. The second single-pole steel plate 10a2 is a pole steel plate 10 having one magnetic pole portion Mp and a radial protrusion portion Rpa that protrudes inward in the radial direction RD from the one magnetic pole portion Mp.

[0077] Here, the linking magnetic pole steel plate 10b includes a first linking magnetic pole steel plate 10b1 and a second linking magnetic pole steel plate 10b2. The first linking magnetic pole steel plate 10b1 and the second linking magnetic pole steel plate 10b2 are magnetic pole steel plates 10 having radial protrusions Rpb that protrude inward in the radial direction RD from two magnetic pole portions Mp. The first linking magnetic pole steel plate 10b1 is a magnetic pole steel plate 10 in which a larger protrusion protrudes from the magnetic pole portion Mp located on the clockwise side of the two magnetic pole portions Mp. The second linking magnetic pole steel plate 10b2 is a magnetic pole steel plate 10 in which a larger protrusion protrudes from the magnetic pole portion Mp located on the counterclockwise side of the two magnetic pole portions Mp. Here, in each of the first linking magnetic pole steel plate 10b1 and the second linking magnetic pole steel plate 10b2, the smaller radial protrusion may be referred to as the first radial protrusion Rpb1, and the larger radial protrusion may be referred to as the second radial protrusion Rpb2. Also, here, each of the multiple unit layers UL has 10 magnetic pole portions Mp.

[0078] 7 shows five unit layers UL: unit layer ULa, unit layer ULb, unit layer ULc, unit layer ULd, and unit layer ULe. The unit layers ULa to ULe are stacked in order along the axial direction AD. Here, each of the unit layers ULa to ULe includes three first single magnetic pole steel plates 10a1, three second single magnetic pole steel plates 10a2, one first connection pole steel plate 10b1, and one second connection pole steel plate 10b2.

[0079] In the unit layer ULa, the second single magnetic pole steel plate 10a2, the first connecting magnetic pole steel plate 10b1, the first single magnetic pole steel plate 10a1, the second single magnetic pole steel plate 10a2, the first single magnetic pole steel plate 10a1, the second connecting magnetic pole steel plate 10b2, the second single magnetic pole steel plate 10a2 and the first single magnetic pole steel plate 10a1 are arranged in this order clockwise from the reference position Pa along the circumferential direction CD.

[0080] In the unit layer ULb, one magnetic pole portion Mp of the first linked magnetic pole steel plate 10b1, the first single magnetic pole steel plate 10a1, the second single magnetic pole steel plate 10a2, the first single magnetic pole steel plate 10a1, the second linked magnetic pole steel plate 10b2, the second single magnetic pole steel plate 10a2, the first single magnetic pole steel plate 10a1, the second single magnetic pole steel plate 10a2 and the other magnetic pole portion Mp of the first linked magnetic pole steel plate 10b1 are arranged in this order from the reference position Pb in the circumferential direction CD.

[0081] In the unit layer ULc, the second single magnetic pole steel plate 10a2, the first single magnetic pole steel plate 10a1, the second connecting magnetic pole steel plate 10b2, the second single magnetic pole steel plate 10a2, the first single magnetic pole steel plate 10a1, the second single magnetic pole steel plate 10a2, the first connecting magnetic pole steel plate 10b1 and the first single magnetic pole steel plate 10a1 are arranged in this order clockwise from the reference position Pc along the circumferential direction CD.

[0082] In the unit layer ULd, the second connecting magnetic pole steel plate 10b2, the second single magnetic pole steel plate 10a2, the first single magnetic pole steel plate 10a1, the second single magnetic pole steel plate 10a2, the first connecting magnetic pole steel plate 10b1, the first single magnetic pole steel plate 10a1, the second single magnetic pole steel plate 10a2 and the first single magnetic pole steel plate 10a1 are arranged in this order clockwise from the reference position Pd along the circumferential direction CD.

[0083] In the unit layer ULe, the second single-pole steel plate 10a2, the first single-pole steel plate 10a1, the second single-pole steel plate 10a2, the first connecting pole steel plate 10b1, the first single-pole steel plate 10a1, the second single-pole steel plate 10a2, the first single-pole steel plate 10a1, and the second connecting pole steel plate 10b2 are arranged in this order clockwise from the reference position Pe along the circumferential direction CD.

[0084] In the unit layer following the unit layer ULe, the first single magnetic pole steel plate 10a1, the second single magnetic pole steel plate 10a2, the first linking pole steel plate 10b1, and the second linking pole steel plate 10b2 are arranged in the same manner as in the unit layer ULa. Then, the first single magnetic pole steel plate 10a1, the second single magnetic pole steel plate 10a2, the first linking pole steel plate 10b1, and the second linking pole steel plate 10b2 are arranged in the same manner as in the unit layers ULb to ULe.

[0085] Here, when attention is paid to the arrangement of the first connection pole steel plate 10b1 relative to the reference positions Pa to Pe in the unit layers ULa to ULe, the first connection pole steel plate 10b1 is located at a position rotated counterclockwise by 72° for each unit layer UL. Similarly, in the unit layers ULa to ULe, the first single pole steel plate 10a1, the second single pole steel plate 10a2, and the second connection pole steel plate 10b2 are also located at a position rotated counterclockwise by 72° for each unit layer UL.

[0086] 6 and 7, the inner core 120 is located radially inward of the outer core 110 and the magnet 130 in the radial direction RD. The outer core 110 and the inner core 120 are located apart from each other. A resin part 140 (FIG. 2) is interposed between the inner core 120 and the outer core 110. At least one of the single magnetic pole steel plate 10a and the connecting magnetic pole steel plate 10b included in the outer core 110 further has a radial protrusion Rp that protrudes from the magnetic pole part Mp closer to the inner core 120 than the connecting part Cc.

[0087] The radial projections Rp that project toward the inner core 120 side of the connecting portions Cc with respect to the magnetic pole portions Mp function as wedges with respect to the resin portion 140. This makes it possible to prevent the outer core 110 from twisting relative to the inner core 120 in the circumferential direction CD.

[0088] Here, attention is focused on the magnetic pole portion Mp on the counterclockwise side of the first connection pole steel plate 10b1 in the unit layer ULa and the magnetic pole portion Mp stacked in the axial direction AD relative to this magnetic pole portion Mp. In the unit layer ULa, the magnetic pole portion Mp of the first single magnetic pole steel plate 10a1 is adjacent to the magnetic pole portion Mp on which the radial protrusion portion Rbp1 of the first connection pole steel plate 10b1 is provided, and in the unit layer ULb, the magnetic pole portion Mp of the first single magnetic pole steel plate 10a1 is adjacent to it. Furthermore, in the unit layer ULc, the magnetic pole portion Mp of the first single magnetic pole steel plate 10a1 is adjacent to it. Furthermore, in the unit layer ULd, the magnetic pole portion Mp on which the radial protrusion portion Rbp1 of the second connection pole steel plate 10b2 is provided is adjacent to it.

[0089] In this way, the single-pole steel plate 10a includes a first single-pole steel plate 10a1 that includes one magnetic pole portion. The connecting magnetic pole steel plate 10b further has a radial protrusion portion Rpb that protrudes inward in the radial direction RD relative to the magnetic pole portion Mp. The first single-pole steel plate 10a1 is located between connecting magnetic pole steel plates 10b in different unit layers UL among the multiple unit layers UL. Because the first single-pole steel plate 10a1 does not have a radial protrusion portion Rpa, a resin portion 140 is interposed in a gap along the axial direction AD between the radial protrusion portions Rp of the connecting magnetic pole steel plates 10b in different unit layers UL among the multiple unit layers UL.

[0090] In this case, the first single magnetic pole steel plate 10a1, which does not have a radial protrusion portion Rpa, can be arranged between the radial protrusion portions Rpb of the connecting magnetic pole steel plate 10b, and the resin portion 140 is interposed in the gap along the axial direction AD of the radial protrusion portions Rpb of the connecting magnetic pole steel plate 10b, thereby preventing the outer core 110 from moving in the axial direction AD.

[0091] Here, attention is focused on the magnetic pole portion Mp of the second single magnetic pole steel plate 10a2 located clockwise with respect to the reference positions Pa-Pe in the unit layer ULa, and the magnetic pole portion Mp stacked in the axial direction AD relative to this magnetic pole portion Mp. In the unit layer ULa, the magnetic pole portion Mp on which the radial protrusion portion Rbp2 of the first link magnetic pole steel plate 10b1 is provided is adjacent to the magnetic pole portion Mp of the second single magnetic pole steel plate 10a2. Furthermore, in the unit layer ULc, the magnetic pole portion Mp of the second single magnetic pole steel plate 10a2 is adjacent to it. Furthermore, in the unit layer ULd, the magnetic pole portion Mp on which the radial protrusion portion Rbp2 of the second link magnetic pole steel plate 10b2 is provided is adjacent to it.

[0092] Thus, the single-pole steel plate 10a further includes a second single-pole steel plate 10a2 that includes one magnetic pole portion. The second single-pole steel plate 10a2 further has a radial protrusion Rpa that protrudes inward in the radial direction RD relative to the magnetic pole portion Mp. The radial protrusion Rpa of the second single-pole steel plate 10a2 in one unit layer UL overlaps in the axial direction AD with the radial protrusion Rp of the connecting pole steel plate 10b in the other unit layer UL.

[0093] By overlapping the radial protrusion portion Rpa of the single magnetic pole steel plate 10a with the radial protrusion portion Ppb of the connecting magnetic pole steel plate 10b in the axial direction AD, the wedge strength in the circumferential direction CD is improved, and relative displacement of the outer core 110 and the inner core 120 in the circumferential direction CD can be suppressed.

[0094] Each of the plurality of unit layers UL has a first single magnetic pole steel plate 10a1, a second single magnetic pole steel plate 10a2, a first connection pole steel plate 10b1, and a second connection pole steel plate 10b2. In the outer core 110, a first radial protrusion Rpb1 of each of the first connection pole steel plate 10b1 and the second connection pole steel plate 10b2 overlaps in the axial direction AD with the radially inner end portion in the radial direction RD of the magnetic pole portion Mp of the first single magnetic pole steel plate 10a1 or the radial protrusion Rpa of the second single magnetic pole steel plate 10a2.

[0095] In the outer core 110, the second radial protrusion portion Rpb2 of each of the first connecting magnetic pole steel plate 10b1 and the second connecting magnetic pole steel plate 10b2 overlaps in the axial direction AD with the radial protrusion portion Rp of the second single magnetic pole steel plate 10a2 or the radial RD inner end of the magnetic pole portion Mp of the first single magnetic pole steel plate 10a1.

[0096] The first radial protrusion Rpb1 and the second radial protrusion Rpb2 of the first connecting magnetic pole steel plate 10b1 and the second connecting magnetic pole steel plate 10b2 overlap in the axial direction AD with the radial RD inner end of the magnetic pole portion Mp of the first single magnetic pole steel plate 10a1 or the radial protrusion Rpa of the second single magnetic pole steel plate 10a2, thereby preventing the outer core from shifting in the axial direction AD or circumferential direction CD.

[0097] A hole he is provided in each of the magnetic pole portions Mp of the first single magnetic pole steel plate 10a1, the second single magnetic pole steel plate 10a2, the first linking magnetic pole steel plate 10b1, and the second linking magnetic pole steel plate 10b2. The holes he of the first single magnetic pole steel plate 10a1, the second single magnetic pole steel plate 10a2, the first linking magnetic pole steel plate 10b1, and the second linking magnetic pole steel plate 10b2 are connected in the axial direction AD.

[0098] The resin portion 140 is interposed in the holes he of the first single-pole steel plate 10a1, the second single-pole steel plate 10a2, the first linking pole steel plate 10b1, and the second linking pole steel plate 10b2. By interposing the resin in the holes he of the magnetic pole portions Mp of the first single-pole steel plate 10a1, the second single-pole steel plate 10a2, the first linking pole steel plate 10b1, and the second linking pole steel plate 10b2, it is possible to suppress misalignment of the stacked pole steel plates 10 in the axial direction AD and the radial direction RD.

[0099] The linking pole steel plate 10b includes a first linking pole steel plate 10b1 and a second linking pole steel plate 10b2. Each of the first linking pole steel plate 10b1 and the second linking pole steel plate 10b2 has a first magnetic pole portion Mp1, a second magnetic pole portion Mp2 located in the circumferential direction CD relative to the first magnetic pole portion Mp1, a first radial protrusion Rpb1 protruding inward in the radial direction RD relative to the first magnetic pole portion Mp1, and a second radial protrusion Rpb2 protruding inward in the radial direction RD relative to the second magnetic pole portion Mp2 more than the first radial protrusion Rpb1.

[0100] In the first connection pole steel plate 10b1, the second magnetic pole portion Mp2 is located on one side of the circumferential direction CD with respect to the first magnetic pole portion Mp1. In the second connection pole steel plate 10b2, the second magnetic pole portion Mp2 is located on the other side of the circumferential direction CD with respect to the first magnetic pole portion Mp1. The second radial protrusion Rpb2 of the first connection pole steel plate 10b1 overlaps with the second radial protrusion Rpb2 of the second connection pole steel plate 10b2 in the axial direction AD. The first radial protrusion Rpb1 of the first connection pole steel plate 10b1 overlaps with the first radial protrusion Rpb1 of the second connection pole steel plate 10b2 in the axial direction AD.

[0101] The inner core 120 has a main body 122 and a radial protrusion 124 that protrudes outward in the radial direction RD from the main body 122. The radial protrusion 124 of the inner core 120 faces the first radial protrusion Rpb1 of each of the first linking pole steel plate 10b1 and the second linking pole steel plate 10b2, and is located between the second radial protrusions Rpb2 of the first linking pole steel plate 10b1 and the second linking pole steel plate 10b2 in the circumferential direction CD.

[0102] The radial protrusions 124 of the inner core 120 face the first radial protrusions Rpb1 of the first linking pole steel plate 10b1 and the second linking pole steel plate 10b2 of the outer core 110, thereby preventing the outer core 110 and the inner core 120 from being misaligned in the radial direction RD. Furthermore, the first radial protrusions Rpb1 of the first linking pole steel plate 10b1 and the second linking pole steel plate 10b2 that face the radial protrusions 124 of the inner core 120 are smaller than the second radial protrusions Rpb2 of the first linking pole steel plate 10b1 and the second linking pole steel plate 10b2, so the radial protrusions 124 of the inner core 120 can be made relatively large, thereby improving the strength of the inner core 120 against misalignment (twisting) in the circumferential direction CD. Furthermore, since the second radial protrusion portion Rpb2 of the first linking magnetic pole steel plate 10b1 and the second linking magnetic pole steel plate 10b2 do not face the radial protrusion portion 124 of the inner core 120, the radial protrusion portion 124 of the inner core 120 can be made relatively large, thereby improving the strength of the outer core 110 against misalignment (twisting) in the circumferential direction CD.

[0103] Here, focusing on the magnetic pole portion Mp located first clockwise from the reference position Pa to Pe, the radial protrusion portion Rpa of the second single magnetic pole steel plate 10a2 and the second radial protrusion portion Rpb2 of the connecting magnetic pole steel plate 10b (i.e., the second radial protrusion portions Rpb2 of the first connecting magnetic pole steel plate 10b1 and the second connecting magnetic pole steel plate 10b2) are stacked from the unit layer ULa to the unit layer ULe.

[0104] Furthermore, when focusing on the magnetic pole portion Mp located further clockwise from the magnetic pole portion Mp, the first single magnetic pole steel plate 10a1 and the first radial protrusion portion Rpb1 of the connecting magnetic pole steel plate 10b (i.e., the first radial protrusion portion Rpb1 of the first connecting magnetic pole steel plate 10b1 and the second connecting magnetic pole steel plate 10b2) are stacked from the unit layer ULa to the unit layer ULe.

[0105] Next, with reference to Figures 8A to 8C, the first single-pole steel plate 10a1, the second single-pole steel plate 10a2, the first linking pole steel plate 10b1, and the second linking pole steel plate 10b2 in the rotor 100 according to one embodiment of the present invention will be described. Figure 8A is a schematic plan view of the first single-pole steel plate 10a1 in the rotor 100 according to one embodiment of the present invention, and Figure 8B is a schematic plan view of the second single-pole steel plate 10a2 in the rotor 100 according to one embodiment of the present invention. Figure 8C is a schematic plan view of the first linking pole steel plate 10b1 in the rotor 100 according to one embodiment of the present invention, and Figure 8D is a schematic plan view of the second linking pole steel plate 10b2 in the rotor 100 according to one embodiment of the present invention.

[0106] As shown in Fig. 8A, the first single-pole steel plate 10a1 has one magnetic pole portion Mp. The magnetic pole portion Mp is a thin plate having a substantially sector shape. A hole he is provided in the magnetic pole portion Mp.

[0107] The first single-pole steel plate 10a1 further has a circumferential protrusion Cp, which protrudes clockwise and counterclockwise from the magnetic pole portion Mp outward in the circumferential direction CD on the radially outer side of the magnetic pole portion Mp in the radial direction RD.

[0108] As shown in FIG. 8B, the second single-pole steel plate 10a2 has one magnetic pole portion Mp. The magnetic pole portion Mp is a thin plate having a generally sector shape. A hole he is provided in the magnetic pole portion Mp. The second single-pole steel plate 10a2 further has a radial protrusion Rpa that protrudes inward in the radial direction RD from the magnetic pole portion Mp. The radial protrusion Rpa extends in the circumferential direction CD from the connection portion between the magnetic pole portion Mp and the radial protrusion Rpa.

[0109] The second single-pole steel plate 10a2 further has a circumferential protrusion Cp, which protrudes clockwise and counterclockwise from the magnetic pole portion Mp outward in the circumferential direction CD on the radially outer side of the magnetic pole portion Mp in the radial direction RD.

[0110] As shown in FIG. 8C, the first connection pole steel plate 10b1 has two magnetic pole portions Mp and a connection portion Cc. The magnetic pole portions Mp are thin plates having a generally sector shape. A hole he is provided in the magnetic pole portions Mp. It is preferable that the two magnetic pole portions Mp of the connection pole steel plate 10b have the same configuration as the magnetic pole portion Mp of the single pole steel plate 10a.

[0111] The first connection pole steel plate 10b1 has a first magnetic pole portion Mp1, a second magnetic pole portion Mp2 located in the circumferential direction CD with respect to the first magnetic pole portion Mp1, a connection portion Cc, a first radial protrusion portion Rpb1 that protrudes inward in the radial direction RD with respect to the first magnetic pole portion Mp1, and a second radial protrusion portion Rpb2 that protrudes inward in the radial direction RD with respect to the second magnetic pole portion Mp2 and is larger than the first radial protrusion portion Rpb1. In the first connection pole steel plate 10b1, the second radial protrusion portion Rpb2 is located on the clockwise side with respect to the first radial protrusion portion Rpb1.

[0112] The connecting portion Cc connects the two magnetic pole portions Mp. The connecting portion Cc connects the radially inner portions of the first magnetic pole portion Mp1 and the second magnetic pole portion Mp2. The connecting portion Cc extends in the circumferential direction CD between the radially inner portions of the first magnetic pole portion Mp1 and the second magnetic pole portion Mp2.

[0113] The first connection pole steel plate 10b1 further has circumferential protrusions Cp that protrude clockwise and counterclockwise from the first magnetic pole portion Mp1 and the second magnetic pole portion Mp2 in the radial direction RD outwardly of the magnetic pole portion Mp and the second magnetic pole portion Mp2 in the circumferential direction CD.

[0114] As shown in FIG. 8D, the second connection pole steel plate 10b2 has two magnetic pole portions Mp and a connection portion Cc. The magnetic pole portions Mp are thin plates having a generally sector shape. A hole he is provided in the magnetic pole portions Mp. It is preferable that the two magnetic pole portions Mp of the connection pole steel plate 10b have the same configuration as the magnetic pole portion Mp of the single pole steel plate 10a.

[0115] The second linking magnetic pole steel plate 10b2 has a first magnetic pole portion Mp1, a second magnetic pole portion Mp2 located in the circumferential direction CD with respect to the first magnetic pole portion Mp1, a linking portion Cc, a first radial protrusion Rpb1 that protrudes inward in the radial direction RD with respect to the first magnetic pole portion Mp1, and a second radial protrusion Rpb2 that protrudes inward in the radial direction RD with respect to the second magnetic pole portion Mp2 and is larger than the first radial protrusion Rpb1. In the first linking magnetic pole steel plate 10b1, the second radial protrusion Rpb2 is located on the counterclockwise side with respect to the first radial protrusion Rpb1.

[0116] The connecting portion Cc connects the two magnetic pole portions Mp. The connecting portion Cc connects the radially inner portions of the first magnetic pole portion Mp1 and the second magnetic pole portion Mp2 in the circumferential direction CD. The connecting portion Cc extends between the radially inner portion of the first magnetic pole portion Mp1 and the radially inner portion of the second magnetic pole portion Mp2 in the circumferential direction CD.

[0117] The second connection pole steel plate 10b2 further has circumferential protrusions Cp that protrude clockwise and counterclockwise from the first magnetic pole portion Mp1 and the second magnetic pole portion Mp2 outward in the circumferential direction CD on the radially outer side of the first magnetic pole portion Mp1 and the second magnetic pole portion Mp2, respectively.

[0118] 6 and 7, the radial protrusion Rp is located radially inward from the magnetic pole portion Mp in the radial direction RD. The radial protrusion Rp extends outward in the circumferential direction CD from the connection portion between the radial protrusion Rp and the magnetic pole portion Mp. By having the radial protrusion Rp located radially inward from the magnetic pole portion Mp in the radial direction RD and extending outward in the circumferential direction CD from the connection portion between the radial protrusion Rp and the magnetic pole portion Mp, the magnet 130 can be positioned in the radial direction RD.

[0119] The inner core 120 has a main body 122 and a radial protrusion 124 that protrudes outward in the radial direction RD from the main body 122. The radial protrusion 124 of the inner core 120 faces the first radial protrusion Rpb1 of each of the first linking pole steel plate 10b1 and the second linking pole steel plate 10b2, and is located between the second radial protrusions Rpb2 of the first linking pole steel plate 10b1 and the second linking pole steel plate 10b2 in the circumferential direction CD.

[0120] Next, the outer core 110, the inner core 120, and the magnet 130 in the rotor 100 according to one embodiment of the present invention will be described with reference to Figures 9A to 9C. Figure 9A is a partial enlarged view of Figure 6. Figure 9B is a partial enlarged view of Figure 9A. Figure 9C is a schematic plan view of the second single-pole steel plate 10a2 and the magnet 130 in the rotor 100 according to one embodiment of the present invention.

[0121] 9A and 9B, the inner core 120 has a main body portion 122 and a radial protrusion portion 124 that protrudes outward in the radial direction RD from the main body portion 122. The main body portion 122 has a cylindrical shape.

[0122] The radial protrusion portion 124 faces the portion of the outer core 110 where the first single magnetic pole steel plate 10a1 and the first radial protrusion portion Rpb1 of the connecting magnetic pole steel plate 10b (i.e., the first radial protrusion portions Rpb1 of the first connecting magnetic pole steel plate 10b1 and the second connecting magnetic pole steel plate 10b2) are stacked. On the other hand, the radial protrusion portion 124 does not face the portion in the outer core 110 where the radial protrusion portion Rpa of the second single-pole steel plate 10a2 and the second radial protrusion portion Rpb2 of the connecting pole steel plate 10b (i.e., the second radial protrusion portion Rpb2 of the first connecting pole steel plate 10b1 and the second connecting pole steel plate 10b2) are stacked, but is located between the portion where the radial protrusion portion Rpa of the second single-pole steel plate 10a2 and the second radial protrusion portion Rpb2 of the connecting pole steel plate 10b (i.e., the second radial protrusion portion Rpb2 of the first connecting pole steel plate 10b1 and the second connecting pole steel plate 10b2) are stacked.

[0123] 9C, the magnet 130 is located between the circumferential protrusion Cp and the radial protrusion Rpa of the second single-pole steel plate 10a2. The second single-pole steel plate 10a2 has a radial protrusion Rpa that protrudes inward in the radial direction RD from the magnetic pole portion Mp. The radial protrusion Rpa extends in the circumferential direction CD from the connection between the magnetic pole portion Mp and the radial protrusion Rpa.

[0124] Next, with reference to Figures 10A and 10B, the elastic body 142 and the coating resin portion 144 in the rotor 100 will be described. Figure 10A is a schematic plan view showing the outer core 110, the inner core 120, the magnet 130, and the elastic body 142 in the rotor 100 according to one embodiment of the present invention, and Figure 10B is a schematic plan view showing the outer core 110, the inner core 120, the magnet 130, and the coating resin portion 144 in the rotor 100 according to one embodiment of the present invention.

[0125] As described above, the resin part 140 has an elastic body 142 interposed between the inner core 120 and the outer core 110. The elastic body 142 covers the magnet 130 and portions of the outer core 110 and inner core 120. More specifically, the elastic body 142 covers the axial AD end, both circumferential CD ends, and the radial RD inner end of the magnet 130 on the inner core 120 side. Furthermore, the elastic body 142 covers the axial AD end and the radial RD inner end of the outer core 110 on the inner core 120 side. Furthermore, the elastic body 142 covers the periphery of the shaft through-hole 120h of the inner core 120 so that it is exposed. For example, the elastic body 142 includes rubber or elastomer. The elastic body 142 can suppress transmission of vibrations caused by magnetic action on the magnetic pole part Mp side to the shaft SH (FIG. 1).

[0126] The resin part 140 further has a coating resin part 144. The coating resin part 144 covers the outer peripheral surfaces and the axial AD ends of the magnet 130 and the outer core 110 other than the areas covered by the elastic body 142. More specifically, the coating resin part 144 covers the axial AD ends, both circumferential CD ends, and the radial RD outer end of the magnet 130 on the radial RD outer side. Furthermore, the coating resin part 144 covers the axial AD ends and the radial RD outer end of the outer core 110 on the radial RD outer side.

[0127] By covering the magnet 130 and the outer core 110 with the resin coating 144 on the other parts of the axial AD end portions and the outer peripheral surface, it is possible to prevent the magnet 130 and the outer core 110 from shifting in position in the axial AD and radial directions RD.

[0128] 3A to 10B, each unit layer UL has a single magnetic pole steel plate 10a and a connecting magnetic pole steel plate 10b, but this embodiment is not limited to this. A unit layer UL may have multiple types of connecting magnetic pole steel plates 10b without having a single magnetic pole steel plate 10a.

[0129] Next, a rotor 100 according to this embodiment will be described with reference to Figures 11 and 12. Figure 11 is a schematic perspective view of the outer core 110, the inner core 120, and the magnet 130 in the rotor 100 according to one embodiment of the present invention. Like Figures 3A and 6, Figure 11 shows the rotor 100 with the resin portion 140 removed. The rotor 100 in Figure 11 has the same configuration as the rotor 100 shown in Figures 3A and 6, except that the unit layers UL in the outer core 110 have different types of linked magnetic pole steel plates 10b, and therefore, redundant description will be omitted to avoid redundancy.

[0130] 11, the rotor 100 has an outer core 110, an inner core 120, and a magnet 130. The outer core 110 has a plurality of magnetic pole steel plates 10. Each of the plurality of magnetic pole steel plates 10 has at least one magnetic pole portion Mp.

[0131] Here, the magnetic pole portion Mp is substantially sector-shaped. The magnetic pole portion Mp is provided with a hole he. In the stacked magnetic pole portions Mp, the holes he of the multiple magnetic pole portions Mp are preferably arranged linearly along the axial direction AD. In this case, by arranging the resin portion 140 (FIG. 2) in the hole he of the magnetic pole portion Mp, the resin portion 140 can firmly fix the magnetic pole portion Mp.

[0132] The outer core 110 has a plurality of magnetic pole steel plates 10. Each of the plurality of magnetic pole steel plates 10 has at least one magnetic pole portion Mp. The magnetic pole portion Mp has a substantially sector shape. Therefore, the outer core 110 has a plurality of magnetic pole portions Mp. The plurality of magnetic pole steel plates 10 are arranged along the circumferential direction CD. The plurality of magnetic pole steel plates 10 are also stacked along the axial direction AD. Here, some of the plurality of magnetic pole steel plates 10 have radial protrusions on the inside in the radial direction RD relative to the magnetic pole portion Mp. Details of the radial protrusions of the magnetic pole steel plates 10 will be described later.

[0133] The rotor 100 comprises an outer core 110 having a plurality of magnetic pole portions Mp arranged in the circumferential direction CD, an inner core 120 located radially inward from the outer core 110 in the radial direction RD, a magnet 130 arranged in a gap portion Ms provided between adjacent magnetic pole portions Mp among the plurality of magnetic pole portions Mp, and a resin portion 140 covering the outer core 110, the inner core 120 and the magnet 130.

[0134] FIG. 12 is a schematic exploded perspective view of a plurality of unit layers UL of the outer core 110 in the rotor 100 according to one embodiment of the present invention.

[0135] As shown in FIG. 12 , the outer core 110 has a plurality of unit layers UL. Here, each of the plurality of unit layers UL has a plurality of magnetic pole steel plates 10. In each unit layer UL, the plurality of magnetic pole steel plates 10 have a connecting magnetic pole steel plate 10b. The connecting magnetic pole steel plate 10b is a magnetic pole steel plate 10 having two magnetic pole portions Mp. The connecting magnetic pole steel plate 10b has two magnetic pole portions Mp and a connecting portion Cc that connects the two magnetic pole portions Mp. Here, each of the plurality of unit layers UL has ten magnetic pole portions Mp.

[0136] 12 shows five unit layers UL: unit layer ULa, unit layer ULb, unit layer ULc, unit layer ULd, and unit layer ULe. The unit layers ULa to ULe are stacked in order along the axial direction AD. Here, each of the unit layers ULa to ULe includes five connecting magnetic pole steel plates 10b. However, adjacent unit layers UL include different types of connecting magnetic pole steel plates 10b.

[0137] In the unit layer ULa, one magnetic pole portion Mp of the first connection pole steel plate 10b1, four first connection pole steel plates 10b1, and the other magnetic pole portion Mp of the first connection pole steel plate 10b1 are arranged in order from the reference position Pa clockwise in the circumferential direction CD.

[0138] In the unit layer ULb, five second link pole steel plates 10b2 are arranged in order clockwise from the reference position Pb along the circumferential direction CD.

[0139] In the unit layer ULc, similarly to the unit layer ULa, one magnetic pole portion Mp of the first linked magnetic pole steel plate 10b1, four first linked magnetic pole steel plates 10b1, and the other magnetic pole portion Mp of the first linked magnetic pole steel plate 10b1 are arranged in order from the reference position Pc in a clockwise direction along the circumferential direction CD.

[0140] In the unit layer ULd, similarly to the unit layer ULb, five second link pole steel plates 10b2 are arranged in order clockwise from the reference position Pd along the circumferential direction CD.

[0141] In the unit layer ULe, similarly to the unit layers ULa and ULc, one magnetic pole portion Mp of the first linked magnetic pole steel plate 10b1, four first linked magnetic pole steel plates 10b1, and the other magnetic pole portion Mp of the first linked magnetic pole steel plate 10b1 are arranged in order clockwise from the reference position Pe along the circumferential direction CD.

[0142] 4, the unit layer UL following the unit layer ULe is omitted. In the unit layer following the unit layer ULe, a second linkage pole steel plate 10b2 is arranged, similar to the unit layers ULb and ULd. Then, a first linkage pole steel plate 10b1 and a second linkage pole steel plate 10b2 are arranged, similar to the unit layers ULa and ULb.

[0143] As such, the outer core 110 has a plurality of unit layers UL stacked along the axial direction AD. Each of the plurality of unit layers UL has a plurality of connecting pole steel plates 10b. One unit layer UL of two adjacent unit layers UL in the plurality of unit layers UL has a plurality of first connecting pole steel plates 10b1, and the other unit layer UL of two adjacent unit layers UL in the plurality of unit layers UL has a plurality of second connecting pole steel plates 10b2.

[0144] Each of the first linking magnetic pole steel plate 10b1 and the second linking magnetic pole steel plate 10b2 has a first magnetic pole portion Mp1, a second magnetic pole portion Mp2 located in the circumferential direction CD relative to the first magnetic pole portion Mp1, a first radial protrusion portion Rpb1 protruding inward in the radial direction RD relative to the first magnetic pole portion Mp1, and a second radial protrusion portion Rpb2 protruding inward in the radial direction RD relative to the second magnetic pole portion Mp2 by a larger amount than the first radial protrusion portion Rpb1.

[0145] In the first connection pole steel plate 10b1, the second magnetic pole portion Mp2 is located on one side in the circumferential direction CD with respect to the first magnetic pole portion Mp1. In the second connection pole steel plate 10b2, the second magnetic pole portion Mp2 is located on the other side in the circumferential direction CD with respect to the first magnetic pole portion Mp1. The first radial protrusion Rpb1 of the first connection pole steel plate 10b1 in one unit layer UL is stacked in the axial direction AD with the first radial protrusion Rpb1 of the second connection pole steel plate 10b2 in the other unit layer UL.

[0146] The second radial protrusion Rpb2 of the first connection pole steel plate 10b1 in one unit layer UL is stacked in the axial direction AD with the second radial protrusion Rpb2 of the second connection pole steel plate 10b2 in the other unit layer UL.

[0147] By laminating the relatively large second radial protrusions Rpb2 and the relatively small first radial protrusions Rpb1 in the first linking magnetic pole steel plate 10b1 and the second linking magnetic pole steel plate 10b2 included in each of two adjacent unit layers UL out of the stacked unit layers UL, it is possible to cover the outer core 110 together with the inner core 120 and the magnet 130 with the resin part 140 while suppressing misalignment of the entire outer core 110. Furthermore, because the magnetic pole parts Mp of the unit layers UL are not connected all around in the circumferential direction CD, leakage of magnetic flux flowing through the connecting parts Cc can be reduced.

[0148] 1, the motor 400 preferably includes the rotor 100 described above. This makes it possible to prevent the entire outer core 110 from being misaligned when the outer core 110, the inner core 120, and the magnet 130 are covered with the resin part 140. Furthermore, since the magnetic pole parts Mp of the unit layers UL are not connected all around in the circumferential direction CD and the connecting parts Cc of the connecting magnetic pole steel plates 10b in the stacked unit layers are not connected in the axial direction AD, leakage of magnetic flux flowing through the connecting parts Cc can be reduced.

[0149] The embodiments of the present invention have been described above with reference to the drawings (FIGS. 1 to 12). However, the present invention is not limited to the above-described embodiments and can be embodied in various forms without departing from the spirit of the present invention. The drawings mainly show each component in a schematic manner for ease of understanding, and the thickness, length, number, etc. of each component shown in the drawings may differ from the actual components due to the convenience of creating the drawings. Furthermore, the materials, shapes, dimensions, etc. of each component shown in the above-described embodiments are merely examples and are not particularly limited, and various modifications are possible within a range that does not substantially depart from the effects of the present invention.

[0150] 3A to 12, the rotor 100 has a structure in which the unit layer UL has a periodic structure repeated every five layers, but this embodiment is not limited to this. The number of repeated layers of the periodic structure in the unit layer UL does not have to be five, and may be any number.

[0151] 3A to 12, each of the unit layers UL has ten magnetic pole portions Mp, but this embodiment is not limited to this. The rotor 100 may have eight magnetic pole portions Mp or fourteen magnetic pole portions Mp. [Explanation of symbols]

[0152] 100 rotors 110 outer core 120 inner core 130 Magnet 140 Resin part

Claims

1. an outer core having a plurality of magnetic pole portions arranged in a circumferential direction; an inner core positioned radially inward relative to the outer core; a magnet disposed in a gap provided between adjacent magnetic pole portions among the plurality of magnetic pole portions; a resin portion covering the outer core and the magnet; Equipped with the outer core has a plurality of unit layers stacked in an axial direction, Each of the plurality of unit layers is a single magnetic pole steel plate having one magnetic pole portion included in the plurality of magnetic pole portions; a connecting magnetic pole steel plate having two or more magnetic pole portions included in the plurality of magnetic pole portions and a connecting portion connecting the two or more magnetic pole portions; and In the unit layer, the single magnetic pole steel plate and the connecting magnetic pole steel plate are arranged in a circumferential direction, In two adjacent unit layers among the plurality of unit layers, the positions of the single magnetic pole steel plate and the connecting magnetic pole steel plate in one unit layer are shifted in the circumferential direction with respect to the positions of the single magnetic pole steel plate and the connecting magnetic pole steel plate in the other unit layer; A rotor, wherein at least one of the single magnetic pole steel plate and the connecting magnetic pole steel plate included in the outer core further has a radial protrusion portion that protrudes radially inward from the connecting portion relative to the magnetic pole portion.

2. The inner core and the outer core are positioned apart from each other, The rotor according to claim 1 , wherein the resin portion is interposed between the inner core and the outer core.

3. the radial protrusion is located radially inward of the magnetic pole portion, The rotor according to claim 1 or 2, wherein the radial protrusions extend circumferentially outward beyond connection portions between the radial protrusions and the magnetic pole portions.

4. an outer core having a plurality of magnetic pole portions arranged in a circumferential direction; an inner core positioned radially inward relative to the outer core; a magnet disposed in a gap provided between adjacent magnetic pole portions among the plurality of magnetic pole portions; a resin portion covering the outer core and the magnet; Equipped with the outer core has a plurality of unit layers stacked in an axial direction, Each of the plurality of unit layers is a single magnetic pole steel plate having one magnetic pole portion included in the plurality of magnetic pole portions; a connecting magnetic pole steel plate having two or more magnetic pole portions included in the plurality of magnetic pole portions and a connecting portion connecting the two or more magnetic pole portions; and In the unit layer, the single magnetic pole steel plate and the connecting magnetic pole steel plate are arranged in a circumferential direction, In two adjacent unit layers among the plurality of unit layers, the positions of the single magnetic pole steel plate and the connecting magnetic pole steel plate in one unit layer are shifted in the circumferential direction with respect to the positions of the single magnetic pole steel plate and the connecting magnetic pole steel plate in the other unit layer; the single-pole steel plate includes a first single-pole steel plate including one magnetic pole portion; The connecting magnetic pole steel plate further has a radial protrusion portion that protrudes radially inward with respect to the magnetic pole portion, the first single magnetic pole steel plate is located between the connecting magnetic pole steel plates in different unit layers among the plurality of unit layers, a rotor in which the resin portion is interposed in a gap along the axial direction of the radial protrusion portion of the linking magnetic pole steel plate in different unit layers among the plurality of unit layers.

5. the single-pole steel plate further includes a second single-pole steel plate including one magnetic pole portion; The second single-pole steel plate further has a radial protrusion that protrudes radially inward with respect to the magnetic pole portion, The rotor according to claim 4 , wherein the radial protrusion of the second single-pole steel plate in the one unit layer overlaps in the axial direction with the radial protrusion of the connecting pole steel plate in the other unit layer.

6. The connecting magnetic pole steel plate includes a first connecting magnetic pole steel plate and a second connecting magnetic pole steel plate, Each of the first connecting magnetic pole steel plate and the second connecting magnetic pole steel plate is a first magnetic pole portion; a second magnetic pole portion located circumferentially relative to the first magnetic pole portion; a circumferential protrusion protruding outward in the circumferential direction relative to each of the first magnetic pole portion and the second magnetic pole portion; a first radial protrusion protruding radially inward from the first magnetic pole portion; a second radial protrusion that protrudes radially inward relative to the second magnetic pole portion and is larger than the first radial protrusion; and In the first connecting magnetic pole steel plate, the second magnetic pole portion is located on one circumferential side with respect to the first magnetic pole portion, In the second connecting magnetic pole steel plate, the second magnetic pole portion is located on the other circumferential side with respect to the first magnetic pole portion, the second radial protrusion of the first connection pole steel plate overlaps with the second radial protrusion of the second connection pole steel plate in the axial direction, the first radial protrusion of the first connection pole steel plate overlaps with the first radial protrusion of the second connection pole steel plate in the axial direction, The inner core is a main body; a radial protrusion protruding radially outward from the main body; and 6. The rotor according to claim 5, wherein the radial protrusion portion of the inner core faces the first radial protrusion portion of each of the first connection pole steel plate and the second connection pole steel plate and is located circumferentially between the second radial protrusion portions of each of the first connection pole steel plate and the second connection pole steel plate.

7. each of the plurality of unit layers includes the first single magnetic pole steel plate, the second single magnetic pole steel plate, the first connecting magnetic pole steel plate, and the second connecting magnetic pole steel plate; In the outer core, the first radial protrusions of the first connection pole steel plate and the second connection pole steel plate axially overlap with a radially inner end of the magnetic pole portion of the first single pole steel plate or the radial protrusion of the second single pole steel plate, 7. The rotor according to claim 6, wherein in the outer core, the second radial protrusions of the first connection pole steel plate and the second connection pole steel plate axially overlap with the radial protrusion of the second single pole steel plate or a radially inner end of the magnetic pole portion of the first single pole steel plate.

8. a hole is provided in the magnetic pole portion of each of the first single magnetic pole steel plate, the second single magnetic pole steel plate, the first connecting magnetic pole steel plate, and the second connecting magnetic pole steel plate; the holes of the first single magnetic pole steel plate, the second single magnetic pole steel plate, the first connecting magnetic pole steel plate, and the second connecting magnetic pole steel plate are connected in the axial direction; The rotor according to claim 6 or 7, wherein the resin portion is interposed in the holes of the first single-pole steel plate, the second single-pole steel plate, the first link pole steel plate, and the second link pole steel plate.

9. an outer core having a plurality of magnetic pole portions arranged in a circumferential direction; a magnet disposed in a gap provided between adjacent magnetic pole portions among the plurality of magnetic pole portions; a resin portion covering the outer core and the magnet; Equipped with the outer core has a plurality of unit layers stacked in an axial direction, Each of the plurality of unit layers is a single magnetic pole steel plate having one magnetic pole portion included in the plurality of magnetic pole portions; a connecting magnetic pole steel plate having two or more magnetic pole portions included in the plurality of magnetic pole portions and a connecting portion connecting the two or more magnetic pole portions; and In the unit layer, the single magnetic pole steel plate and the connecting magnetic pole steel plate are arranged in a circumferential direction, In two adjacent unit layers among the plurality of unit layers, the positions of the single magnetic pole steel plate and the connecting magnetic pole steel plate in one unit layer are shifted in the circumferential direction with respect to the positions of the single magnetic pole steel plate and the connecting magnetic pole steel plate in the other unit layer; The resin portion has an elastic body interposed between an inner core positioned radially inside the outer core and the outer core.

10. an inner core positioned radially inward relative to the outer core, The resin portion further includes a coating resin portion, the elastic body covers the magnet and a portion of each axial end of the outer core and the inner core, The rotor according to claim 9 , wherein the resin coating portion covers the magnet, other portions of the axial end portion of the outer core, and an outer peripheral surface.

11. an outer core having a plurality of magnetic pole portions arranged in a circumferential direction; an inner core positioned radially inward relative to the outer core; a magnet disposed in a gap provided between adjacent magnetic pole portions among the plurality of magnetic pole portions; a resin portion covering the outer core and the magnet; Equipped with the outer core has a plurality of unit layers stacked in an axial direction, Each of the plurality of unit layers has a plurality of connecting magnetic pole steel plates, one of two adjacent unit layers in the plurality of unit layers has a plurality of first connecting magnetic pole steel plates, and the other of the two adjacent unit layers has a plurality of second connecting magnetic pole steel plates; Each of the first connecting magnetic pole steel plate and the second connecting magnetic pole steel plate is a first magnetic pole portion; a second magnetic pole portion located circumferentially relative to the first magnetic pole portion; a first radial protrusion protruding radially inward from the first magnetic pole portion; a second radial protrusion that protrudes radially inward relative to the second magnetic pole portion and is larger than the first radial protrusion; and In the first connecting magnetic pole steel plate, the second magnetic pole portion is located on one circumferential side with respect to the first magnetic pole portion, In the second connecting magnetic pole steel plate, the second magnetic pole portion is located on the other circumferential side with respect to the first magnetic pole portion, the first radial protrusion of the first connection pole steel plate in the one unit layer is stacked in the axial direction with the first radial protrusion of the second connection pole steel plate in the other unit layer, a rotor in which the second radial protrusion of the first connection pole steel plate in one unit layer is stacked in the axial direction with the second radial protrusion of the second connection pole steel plate in the other unit layer.

12. A motor comprising a rotor according to any one of claims 1 to 11.

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