Rotors and Rotating Electric Machines

Abstract

The present invention provides a core for a rotating electric machine and a rotating electric machine that make it possible to easily secure the circumferential displacement of the skew structure. [Solution] Each of the multiple core sheets 24 forming the rotor core has a first fitting portion 43 which is convex in the axial direction and a second fitting portion 45 which is concave in the axial direction. In the multiple core sheets 24, a pair of core sheets 24 that overlap in the axial direction are joined together by the fitting of the first fitting portion 43 of one core sheet 24 and the second fitting portion 45 of the other core sheet 24. The first fitting portion 43 and the second fitting portion 45 provided on the same core sheet 24 are positioned so as not to overlap each other in the axial direction.

Description

Technical Field

[0001] The present disclosure relates to a rotor and a rotating electric machine.

Background Art

[0002] For example, the rotor core of the rotating electric machine disclosed in Patent Document 1 includes a plurality of core sheets laminated in the axial direction. Each core sheet has convex portions and concave portions formed by pressing. Specifically, by pushing a punch axially against one surface of the core sheet, a concave portion is formed on the one surface, and a convex portion is formed on the opposite surface. The core sheets overlapping in the axial direction are joined to each other by fitting the convex portion of one core sheet into the concave portion of the other core sheet. Further, in the rotor of Patent Document 1, magnetic poles are formed by permanent magnets embedded in the rotor core.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the rotor as described above, when realizing a skew structure in which the magnetic poles are displaced in the circumferential direction in the axial direction, it is necessary to form the convex portion and the concave portion on the back side thereof in the circumferential direction on the same core sheet. In this case, by shifting the die and the punch used for pressing the convex portion in the circumferential direction, it is possible to shift the convex portion and the concave portion on the back side thereof in the circumferential direction. However, in this pressing process, it is difficult to increase the amount of circumferential shift between the convex portion and the concave portion. Therefore, in order to ensure a desired displacement amount in the circumferential direction in the skew structure of the magnetic poles, it is necessary to increase the axial length of the rotor core, and thus there are restrictions on the design of the rotor core.

[0005] The object of this disclosure is to provide a rotor and a rotating electric machine that make it possible to easily secure the circumferential displacement of the skew structure. [Means for solving the problem]

[0006] A rotor that solves the above problem is a rotor (20) comprising a rotor core (22) which is made up of a plurality of core sheets (24) stacked in the axial direction, each having a plurality of magnetic pole forming portions (32) at equal intervals in the circumferential direction, each of which has a permanent magnet (23) made of bonded magnets, and each of the plurality of core sheets has a first fitting portion (43) and a second fitting portion (45), and one of the first fitting portion and the second fitting portion is convex in the axial direction, and the The other of the first and second fitting portions is concave in the axial direction, and the first and second fitting portions provided on the same core sheet are positioned so as not to overlap each other in the axial direction. The core sheets that overlap in the axial direction are joined to each other by the fitting of their first and second fitting portions, so that the magnetic pole forming portions of each of the core sheets stacked in the axial direction form a skew structure, and the magnet holes have a folded shape that protrudes radially inward.

[0007] A rotating electric machine that solves the above problem is a rotating electric machine (M) comprising a rotor (20) and a stator (10), wherein the rotor comprises a rotor core (22) formed by stacking a plurality of core sheets (24) in the axial direction, each having a plurality of magnetic pole forming portions (32) at equal intervals in the circumferential direction, each having a permanent magnet (23) made of bonded magnets and a plurality of magnetic pole forming portions (32) in the circumferential direction, and each of the plurality of core sheets has a first fitting portion (43) and a second fitting portion (45), and one of the first fitting portion and the second fitting portion is axial The first and second fitting portions have a convex shape that protrudes in the direction, and the other of the first and second fitting portions has a concave shape that is recessed in the axial direction. The first and second fitting portions provided on the same core sheet are positioned so as not to overlap each other in the axial direction. The core sheets that overlap in the axial direction are joined to each other by the fitting of their first and second fitting portions, so that the magnetic pole forming portions of each of the core sheets stacked in the axial direction form a skew structure, and the magnet holes have a folded shape that protrudes radially inward. [Brief explanation of the drawing]

[0008] [Figure 1] This is a diagram showing the configuration of a rotating electric machine in an embodiment. [Figure 2] This is a plan view showing a portion of the core sheet in the same configuration. [Figure 3] This is a plan view showing the second magnetic pole forming portion in a core sheet of the same configuration. [Figure 4] This is an explanatory diagram showing the lamination configuration of each core sheet in a rotor core of the same type. [Figure 5] This is an explanatory diagram showing the coupling configuration between core sheets in a rotor core of the same type. [Figure 6] This is a schematic diagram showing the skew structure of the magnetic poles in a rotor of the same type. [Figure 7] This is a schematic diagram showing the skew structure of the magnetic poles in the modified rotor. [Figure 8] This is a schematic diagram showing the skew structure of the magnetic poles in the modified rotor. [Figure 9]This is a cross-sectional view showing the second fitting portion in the rotor core of the modified example. [Figure 10] This is a perspective view showing the core sheet with an example of changes. [Modes for carrying out the invention]

[0009] The following describes the core of a rotating electric machine and one embodiment of the rotating electric machine. The rotating electric machine M of this embodiment, shown in Figure 1, is composed of an embedded magnet type brushless motor. The rotating electric machine M comprises a substantially annular stator 10 and a substantially cylindrical rotor 20 that is rotatably arranged in the radially inner space of the stator 10. The stator 10 applies a rotating magnetic field to the rotor 20.

[0010] (Stator 10) The stator 10 is equipped with a substantially annular stator core 11. The stator core 11 is made of a magnetic metal material. The stator core 11 is constructed by stacking, for example, a plurality of core sheets in a direction along the central axis L1. The plurality of core sheets are made of, for example, electrical steel sheets. The stator core 11 has, for example, 12 teeth 12. The teeth 12 extend radially inward and are arranged at equal intervals in the circumferential direction. Each tooth 12 has the same shape as the others. The radially inward end of each tooth 12 is substantially T-shaped, and the tip surface 12a is arc-shaped, following the outer circumferential surface of the rotor 20.

[0011] The teeth 12 are wound with windings 13, for example, in a concentrated winding configuration. The windings 13 are connected in three phases and function as U-phase, V-phase, and W-phase, respectively, as shown in Figure 1. When power is supplied to the windings 13, a rotating magnetic field is generated in the stator 10 to drive the rotor 20. In this stator 10, the outer circumferential surface of the stator core 11 is fixed to the inner circumferential surface of the housing 14.

[0012] (Rotor 20) The rotor 20 includes a rotating shaft 21, a rotor core 22, and a plurality of permanent magnets 23. The rotor core 22 has a substantially cylindrical shape. The rotating shaft 21 is inserted into the central portion of the rotor core 22. The plurality of permanent magnets 23 are embedded inside the rotor core 22. For example, eight permanent magnets 23 are provided in the rotor core 22. The rotor 20 is rotatably arranged with respect to the stator 10 by being supported by bearings (not shown) provided on the housing 14 with the rotating shaft 21.

[0013] (Configuration of the core sheet 24) The rotor core 22 is formed by laminating a plurality of core sheets 24 shown in FIG. 2 in the axial direction. Each core sheet 24 is made of, for example, an electromagnetic steel sheet formed of a magnetic metal material. In the present embodiment, each core sheet 24 has the same shape as each other.

[0014] As shown in FIG. 2, the core sheet 24 has a shaft insertion hole 31 through which the rotating shaft 21 is inserted, and a plurality of pole forming portions 32 located around the shaft insertion hole 31. The plurality of pole forming portions 32 are provided at equal intervals in the circumferential direction of the rotor core 22. In the following description, the circumferential direction, the axial direction, and the radial direction of the rotor core 22 may be simply referred to as the circumferential direction, the axial direction, and the radial direction, respectively.

[0015] The rotor 20 of the present embodiment is configured with, for example, eight poles. That is, eight pole forming portions 32 are provided at intervals of 45° in the circumferential direction on each core sheet 24. The eight pole forming portions 32 each include a magnet hole 33. Each magnet hole 33 is a hole that penetrates the core sheet 24 in the axial direction. The magnet holes 33 have the same shape in each pole forming portion 32. A permanent magnet 23 is disposed inside each magnet hole 33. Each magnet hole 33 has a folded-back shape that protrudes inward in the radial direction when viewed from the axial direction. That is, each magnet hole 33 has a substantially V shape when viewed from the axial direction. The eight magnet holes 33 are provided at equal intervals in the circumferential direction.

[0016] The eight magnetic pole forming portions 32 each have an outer core portion 34 which is a portion radially outside the diameter of the magnet hole 33. The outer core portion 34 is a part of the core sheet 24 formed inside the V-shaped folded portion of the magnet hole 33. The outer core portion 34 functions as a portion for obtaining a reluctance torque while facing the stator 10. The outer core portion 34 has a substantially triangular shape with one vertex facing the central axis L1 of the core sheet 24 when viewed in the axial direction.

[0017] The eight magnetic pole forming portions 32 of the present embodiment are composed of four first magnetic pole forming portions 41 and four second magnetic pole forming portions 42. The four first magnetic pole forming portions 41 and the four second magnetic pole forming portions 42 are alternately arranged in the circumferential direction.

[0018] In the present embodiment, for example, a connecting portion 35 is provided in the magnet hole 33 of each first magnetic pole forming portion 41. The connecting portion 35 connects the outer core portion 34 and the portion around the shaft insertion hole 31 in the core sheet 24 at the V-shaped bent portion of the radially inner end portion in the magnet hole 33. Note that no connecting portion such as the connecting portion 35 is provided in the magnet hole 33 of each second magnetic pole forming portion 42.

[0019] (Configuration of the first fitting portion 43) Each core sheet 24 has a first fitting portion 43. The first fitting portion 43 is provided on the outer core portion 34 of each first magnetic pole forming portion 41. That is, four first fitting portions 43 are provided in each core sheet 24.

[0020] As shown in Figure 5, the first fitting portion 43 has a convex shape that protrudes in the axial direction. The first fitting portion 43 is formed by press working on the core sheet 24. The back side of the first fitting portion 43 has a recess 44 that is formed when the first fitting portion 43 is press-formed. That is, by pressing a punch (not shown) in the axial direction against one surface of the core sheet 24, the recess 44 is formed on that surface of the core sheet 24, and the first fitting portion 43 is formed on the opposite surface. Therefore, the first fitting portion 43 and the recess 44 have substantially the same shape when viewed from the axial direction. In this embodiment, the first fitting portion 43 and the recess 44 are circular when viewed from the axial direction. The first fitting portion 43 and the recess 44 are not offset in the circumferential direction. That is, the center 43a of the first fitting portion 43 and the center 44a of the recess 44 are located on the same straight line L2 along the axial direction.

[0021] (Configuration of the second fitting portion 45) As shown in Figure 2, each core sheet 24 has a second fitting portion 45. The second fitting portion 45 is provided on the outer core portion 34 of each second pole forming portion 42. That is, each core sheet 24 has four second fitting portions 45. In addition, the first fitting portions 43 and the second fitting portions 45 are provided alternately in the circumferential direction for the eight pole forming portions 32.

[0022] The second fitting portion 45 has a concave shape that is recessed in the axial direction. Specifically, the second fitting portion 45 is a through hole that penetrates the core sheet 24 in the axial direction. The second fitting portion 45 is circular in shape when viewed in the axial direction. Each first fitting portion 43 and each second fitting portion 45 are arranged on the same circle centered on the central axis L1.

[0023] As described above, the first fitting portion 43 is provided on the first magnetic pole forming portion 41, and the second fitting portion 45 is provided on the second magnetic pole forming portion 42. In other words, the first fitting portion 43 and the second fitting portion 45, which are provided on the same core sheet 24, are positioned so as not to overlap each other in the axial direction.

[0024] (Regarding the arrangement of the first fitting portion 43 and the second fitting portion 45) The pitch angle θ1 of the multiple pole-forming sections 32 is the angle between the circumferential centers of each pole-forming section 32. That is, the pitch angle θ1 of the multiple pole-forming sections 32 is θ1 = 360° / P, where P is the number of poles of the rotor 20. Therefore, the pitch angle θ1 in this embodiment is 45°. In addition, in this embodiment, the angle between the circumferential center C1 of the first pole-forming section 41 and the circumferential center C2 of the second pole-forming section 42 is the same as the pitch angle θ1, which is 45°.

[0025] The first fitting portion 43 is provided such that its center 43a is located on the circumferential center C1 of the first magnetic pole forming portion 41. On the other hand, the second fitting portion 45 is set such that its center 45a is offset by a circumferential offset angle θ2 with respect to the circumferential center C2 of the second magnetic pole forming portion 42.

[0026] The first fitting portion 43 is located at the circumferential center of the outer core portion 34. This makes it possible to position the first fitting portion 43 away from the circumferential edge of the outer core portion 34 in the first magnetic pole forming portion 41, i.e., away from the circumferential inner edge of the magnet hole 33. Therefore, it is possible to avoid a decrease in the rigidity of the outer core portion 34 caused by positioning the first fitting portion 43 close to the circumferential edge of the outer core portion 34.

[0027] As shown in Figure 3, when the distance r is from the central axis L1 of the core sheet 24 to the center 45a of the second fitting portion 45, the offset distance D of the second fitting portion 45 with respect to the circumferential center C2 of the second magnetic pole forming portion 42 is D ≈ r × sin(θ2). This offset distance D is set to be at least one-tenth of the thickness t of the core sheet 24. That is, the relationship between the distance r, the offset angle θ2 of the second fitting portion 45, and the thickness t of the core sheet 24 is configured to satisfy 0.1t ≤ r × sin(θ2). Furthermore, the second fitting portion 45 is provided such that its center 45a is located radially outward from the radial center line 34a of the outer core portion 34 of the second magnetic pole forming portion 42.

[0028] As shown in Figure 5, in a plurality of core sheets 24 stacked in the axial direction, a pair of core sheets 24 that overlap in the axial direction are joined together by the fitting of the first fitting portion 43 of one core sheet 24 and the second fitting portion 45 of the other core sheet 24. As a result, in the stacked state of each core sheet 24, the first magnetic pole forming portion 41 and the second magnetic pole forming portion 42 overlap alternately in the axial direction.

[0029] As shown in Figure 4, the multiple core sheets 24 are stacked, for example, each rotated by an accumulation angle θa around the central axis L1. In this embodiment, the accumulation angle θa is θa = θ1 + θ2. That is, the core sheets 24 that overlap in the axial direction are rotated by an angle obtained by adding the pitch angle θ1 of the multiple magnetic pole forming sections 32 to the offset angle θ2.

[0030] As described above, each core sheet 24 is joined to each other by the fitting of the first fitting portion 43 and the second fitting portion 45. The center 43a of the first fitting portion 43 is located on the circumferential center C1 of the first magnetic pole forming portion 41, while the center 45a of the second fitting portion 45 is offset by an offset angle θ2 from the circumferential center C2 of the second magnetic pole forming portion 42. As a result, the magnetic pole forming portions 32 of each core sheet 24 are stacked axially with each one offset by an offset angle θ2 in the circumferential direction. In other words, the magnetic poles of the rotor core 22 formed by the magnetic pole forming portions 32 stacked axially form a so-called skew structure in which the circumferential displacement occurs as you move from one end to the other end of the rotor core 22 in the axial direction.

[0031] Figure 6 shows a rotor core 22 formed by stacking multiple core sheets 24 in the manner described above. In this figure, a skew line L3 is shown on the outer circumferential surface of the rotor core 22, tracing the circumferential centers (i.e., circumferential centers C1, C2) of the magnetic pole forming portions 32 of each core sheet 24 stacked in the axial direction. For the sake of clarity, detailed shapes of the core sheets 24, such as the magnet holes 33, are omitted from Figure 6 and the later-described Figures 7 and 8. As shown by the skew line L3, the magnetic pole forming portions 32 stacked in the axial direction form a so-called skew structure, which is displaced circumferentially from one end to the other in the axial direction of the rotor core 22. The amount of circumferential displacement of this skew structure is determined by the offset angle θ2 of the second fitting portion 45 and the number of stacked core sheets 24.

[0032] The magnet holes 33 in each pole-forming section 32, which are stacked in the axial direction, are displaced circumferentially along the skew line L3 as you move from one end to the other in the axial direction of the rotor core 22. Furthermore, permanent magnets 23 are arranged in the housing space formed by the magnet holes 33 of each core sheet 24 being aligned along the skew line L3.

[0033] The permanent magnet 23 consists of, for example, bonded magnets filled into the housing space formed by a series of magnet holes 33. As a result, the permanent magnet 23 has a roughly V-shaped folded form that protrudes radially inward when viewed from the axial direction. Furthermore, the permanent magnet 23 is displaced circumferentially along the skew line L3 as it moves from one end to the other in the axial direction of the rotor core 22. For example, samarium iron nitrogen (SmFeN) magnets are used as the magnet powder for the permanent magnet 23, but other rare earth magnets may also be used. The magnetic poles of the rotor 20 are formed by the axially stacked magnetic pole forming sections 32 and the permanent magnets 23 arranged in the housing space formed by the magnet holes 33 of the magnetic pole forming sections 32.

[0034] The operation of this embodiment will now be described. The magnetic poles of the rotor core 22 have a skewed structure in which they are displaced circumferentially from one end to the other in the axial direction of the rotor core 22. This makes it possible to keep the cogging torque generated in the rotating electric machine M to a minimum.

[0035] The effects of this embodiment will now be explained. (1) In a plurality of core sheets 24 stacked in the axial direction, a pair of core sheets 24 that overlap in the axial direction are joined together by the fitting of a first fitting portion 43 of one core sheet 24 and a second fitting portion 45 of the other core sheet 24. The first fitting portion 43 and the second fitting portion 45 provided on the same core sheet 24 are located in positions that do not overlap each other in the axial direction.

[0036] Here, as a comparative configuration to this embodiment, a configuration in which each core sheet 24 is joined by fitting the first fitting portion 43 of the core sheet 24 into the recess on the back side of the first fitting portion 43 of the axially adjacent core sheet 24 will be described. In the above comparative configuration, in order to realize the skew structure of the magnetic poles of the rotor 20, it is necessary to offset the first fitting portion 43 and the recess on the back side in the circumferential direction. In this case, it is possible to offset the first fitting portion 43 and the recess on the back side in the circumferential direction by offsetting the die and punch used for press working of the first fitting portion 43 in the circumferential direction. However, with this press working, it is difficult to increase the amount of circumferential offset between the first fitting portion 43 and the recess. Therefore, in order to secure the desired amount of displacement of the skew structure, it becomes necessary to increase the axial length of the rotor core 22, which imposes constraints on the design of the rotor core 22.

[0037] In this embodiment, the first fitting portion 43 and the second fitting portion 45 are provided on the same core sheet 24 at positions that do not overlap each other in the axial direction. In other words, the first fitting portion 43 is not involved in the molding of the second fitting portion 45. Therefore, there is a high degree of freedom in setting the formation position of the second fitting portion 45, and as a result, it is possible to secure a large offset angle θ2 of the second fitting portion 45. Consequently, it is possible to easily secure the amount of circumferential displacement of the skew structure, resulting in a configuration that is less constrained in the design of the rotor core 22.

[0038] (2) In each core sheet 24, the plurality of pole forming portions 32 include a first pole forming portion 41 provided with a first fitting portion 43 and a second pole forming portion 42 provided with a second fitting portion 45. The center 43a of the first fitting portion 43 is set on the circumferential center C1 of the first pole forming portion 41. The center 45a of the second fitting portion 45 is set at a position offset in the circumferential direction with respect to the circumferential center C2 of the second pole forming portion 42. With this configuration, by fitting the first fitting portion 43 of the core sheet 24 to the second fitting portion 45 of an axially adjacent core sheet 24, it is possible to make the poles of the rotor 20 formed by the pole forming portions 32 stacked in the axial direction have a skew structure.

[0039] (3) The relationship between the distance r from the central axis L1 of the core sheet 24 to the center 45a of the second fitting portion 45, the offset angle θ2 of the second fitting portion 45, and the thickness t of the core sheet 24 is configured to satisfy 0.1t ≤ r × sin(θ2). With this configuration, the degree of freedom in setting the formation position of the second fitting portion 45 is improved, making it easy to set the circumferential offset distance D (D ≈ r × sin(θ2)) of the second fitting portion 45 to one-tenth or more of the thickness t of the core sheet 24. For this reason, it is possible to eliminate design constraints such as reducing the distance r from the central axis L1 of the core sheet 24 to the center 45a of the second fitting portion 45 in order to secure the offset angle θ2 of the second fitting portion 45.

[0040] (4) Multiple core sheets 24 are stacked with each sheet rotated by a roll accumulation angle θa. When the pitch angle of the multiple magnetic pole forming sections 32 is θ1 and the offset angle of the second fitting section 45 is θ2, the roll accumulation angle θa is θa = θ1 + θ2. With this configuration, it is possible to stack core sheets 24 that overlap in the axial direction with each sheet rotated by an angle obtained by adding the pitch angle θ1 of the multiple magnetic pole forming sections 32 to the offset angle θ2.

[0041] (5) The multiple pole forming sections 32 are configured by alternately arranging multiple first pole forming sections 41, each provided with a first fitting section 43, and second pole forming sections 42, each provided with a second fitting section 45, in the circumferential direction. With this configuration, it is possible to alternately provide the first fitting section 43 and the second fitting section 45 in the circumferential direction for each of the multiple pole forming sections 32. As a result, in the core sheets 24 that overlap in the axial direction, it is possible to secure fitting locations for the first fitting section 43 and the second fitting section 45 for half the number of pole forming sections 32.

[0042] (6) The first fitting portion 43 is convex in the axial direction, and the second fitting portion 45 is a through hole that penetrates the core sheet 24 in the axial direction. The second fitting portion 45, being a through hole, has a higher magnetic resistance than the first fitting portion 43. Therefore, by offsetting the second fitting portion 45 from the circumferential center C2 of the second magnetic pole forming portion 42, where the magnetic flux density is high, it is possible to minimize the influence on the magnetic properties.

[0043] (7) The offset angle θ2 of the second fitting portion 45 in each core sheet 24 is the same. This configuration makes it possible to make each core sheet 24 the same shape. (8) The second fitting portion 45 is a through hole that penetrates the core sheet 24 in the axial direction. With this configuration, it is possible to easily form the second fitting portion 45 into which the convex first fitting portion 43 is fitted.

[0044] (9) Each core sheet 24 has a recess 44 on the back side of the first fitting portion 43 that is formed when the first fitting portion 43 is press-formed. The center 43a of the first fitting portion 43 and the center 44a of the recess 44 are located on the same straight line L2 along the axial direction. With this configuration, it is possible to form the shape of the first fitting portion 43, which is formed by press working, with high precision.

[0045] (10) In each core sheet 24, each of the multiple pole forming portions 32 has a magnet hole 33 in which a permanent magnet 23 is placed inside. The magnet hole 33 has a folded shape that protrudes radially inward. This configuration makes it possible to secure the size of the outer core portion 34 that contributes to the reluctance torque.

[0046] (11) In each core sheet 24, each of the multiple magnetic pole forming portions 32 has an outer core portion 34 which is the radially outer portion of the magnet hole 33. The first fitting portion 43 and the second fitting portion 45 are provided on the outer core portion 34, respectively. With this configuration, the area of ​​the outer core portion 34 is secured by the V-shape of the magnet hole 33. Therefore, by setting the formation positions of the first fitting portion 43 and the second fitting portion 45 on the outer core portion 34, it is possible to improve the degree of freedom in setting the formation positions of the first fitting portion 43 and the second fitting portion 45.

[0047] (12) The second fitting portion 45 is provided such that its center 45a is located radially outward from the radial center line 34a of the outer core portion 34 of the second magnetic pole forming portion 42. When the formation position of the second fitting portion 45 is shifted in the circumferential direction due to manufacturing errors, the error in the offset angle θ2 becomes larger the radially inward position of the second fitting portion 45 (i.e., the smaller the distance r). Therefore, by having the second fitting portion 45 radially outward from the radial center line 34a, it is possible to keep the error in the offset angle θ2 small.

[0048] (13) The first fitting portion 43 is circular when viewed from the axial direction. This makes it possible to equalize the stress around the first fitting portion 43. Similarly, the second fitting portion 45 is circular when viewed from the axial direction. This makes it possible to equalize the stress around the second fitting portion 45.

[0049] (14) Each pole forming section 32 is provided with only one first fitting section 43 or one second fitting section 45. The first fitting section 43 and the second fitting section 45 are factors that obstruct the flow of magnetic flux in the pole forming section 32. Therefore, by minimizing the number of first fitting sections 43 or second fitting sections 45 provided in one pole forming section 32, it is possible to suppress the deterioration of the flow of magnetic flux in each pole forming section 32.

[0050] This embodiment can be implemented with the following modifications. This embodiment and the following modifications can be combined with each other to the extent that they do not contradict each other technically. The multiple core sheets 24 forming the rotor core 22 may include core sheets 24 with different offset angles θ2 of the second fitting portion 45.

[0051] For example, in the rotor core 22 shown in Figure 7, the first core sheet group 51 and the second core sheet group 52 are stacked in the axial direction. The first core sheet group 51 is composed of multiple core sheets 24 of the same shape stacked together. The multiple core sheets 24 constituting the first core sheet group 51 are each designated as the first core sheet 24a. The multiple first core sheets 24a are all of the same shape. Similarly, the multiple core sheets 24 constituting the second core sheet group 52 are each designated as the second core sheet 24b. The multiple second core sheets 24b are all of the same shape.

[0052] Here, let α° be the offset angle θ2 of the second fitting portion 45 in the first core sheet 24a, and β° be the offset angle θ2 of the second fitting portion 45 in the second core sheet 24b. In the example shown in Figure 7, when α is a positive value, β is a negative value. That is, the second fitting portion 45 of the second core sheet 24b is offset in the opposite direction to the second fitting portion 45 of the first core sheet 24a. As a result, in the skew structure of the rotor 20's magnetic poles, the circumferential displacement on one side in the axial direction can be made opposite in the first core sheet group 51 and the second core sheet group 52. Therefore, the axial thrust force generated by the skew structure of the rotor 20's magnetic poles is in the opposite direction in the first core sheet group 51 and the second core sheet group 52. As a result, it is possible to keep the total thrust force of the rotor 20, which is the sum of the thrust forces generated in the first core sheet group 51 and the second core sheet group 52, small.

[0053] Furthermore, in the example shown in Figure 7, the absolute values ​​of the positive value α and the negative value β are set to be equal. This makes it possible to make the circumferential displacement on one side in the axial direction of the skew structure of the rotor 20 equal between the first core sheet group 51 and the second core sheet group 52. This makes it possible to cancel out the thrust forces generated in each of the first core sheet group 51 and the second core sheet group 52, thereby reducing the thrust force generated in the rotor 20 as a whole. Note that Figure 8 shows an example where α is set to a positive value and α < β.

[0054] As shown in Figure 9, the second fitting portion 45 may be a recess that does not penetrate the core sheet 24. With this configuration, it is possible to keep the magnetic resistance of the second fitting portion 45 lower compared to the case where the second fitting portion 45 is a through hole.

[0055] In the core sheet 24 of the above embodiment, only one group of protrusions and recesses consisting of a plurality of first fitting portions 43 and a plurality of second fitting portions 45 arranged on the same circle centered on the central axis L1 is provided, but it is not particularly limited to this, and two or more such groups of protrusions and recesses may be provided.

[0056] For example, the core sheet 24 shown in Figure 10 has a first group of protrusions 61 consisting of a plurality of first fitting portions 43 and a plurality of second fitting portions 45 arranged on a first reference circle X1 centered on the central axis L1. The core sheet 24 also has a second group of protrusions 62 consisting of a plurality of first fitting portions 43 and a plurality of second fitting portions 45 arranged on a second reference circle X2 centered on the central axis L1. The second reference circle X2 has a smaller diameter than the first reference circle X1.

[0057] In the first group of protrusions 61, the first fitting portion 43 and the second fitting portion 45 are provided alternately in the circumferential direction with respect to a plurality of magnetic pole forming portions 32, for example. Similarly, in the second group of protrusions 62, the first fitting portion 43 and the second fitting portion 45 are provided alternately in the circumferential direction with respect to a plurality of magnetic pole forming portions 32. Here, in the plurality of magnetic pole forming portions 32, the magnetic pole forming portion 32 on which the first fitting portion 43 of the first group of protrusions 61 is provided is designated as the first magnetic pole forming portion 41, and the magnetic pole forming portion 32 on which the second fitting portion 45 of the first group of protrusions 61 is provided is designated as the second magnetic pole forming portion 42. Each first magnetic pole forming portion 41 is provided with one first fitting portion 43 of the first group of protrusions 61 and one second fitting portion 45 of the second group of protrusions 62. Each second pole forming section 42 is provided with one second fitting section 45 for the first protrusion group 61 and one first fitting section 43 for the second protrusion group 62. The first fitting section 43 of the first protrusion group 61 and the second protrusion group 62 are located at the circumferential center of the pole forming section 32. The second fitting section 45 of the first protrusion group 61 and the second protrusion group 62 are located at a position offset in the circumferential direction from the circumferential center of the pole forming section 32.

[0058] In each of the first and second protrusion groups 61 and 62, the first fitting portion 43 and the second fitting portion 45 within the same protrusion group correspond to each other. That is, when the core sheets 24 are stacked, the first fitting portion 43 of the first protrusion group 61 fits into the second fitting portion 45 of the first protrusion group 61 on the adjacent core sheet 24. Similarly, the first fitting portion 43 of the second protrusion group 62 fits into the second fitting portion 45 of the second protrusion group 62 on the adjacent core sheet 24.

[0059] As shown in Figure 10, the first group of protrusions 61 and the second group of protrusions 62 make it possible to improve the bonding strength of each core sheet 24 stacked in the axial direction. Furthermore, in each of the first group of protrusions 61 and the second group of protrusions 62, the first reference circle X1 and the second reference circle X2, which serve as the reference for the positions of the first fitting portion 43 and the second fitting portion 45, have different diameters. As a result, in one magnetic pole forming portion 32, the first fitting portion 43 and the second fitting portion 45 are not aligned in the circumferential direction. Therefore, it is possible to avoid a decrease in the rigidity of the outer core portion 34, which would occur if the first fitting portion 43 and the second fitting portion 45 were located close to the circumferential edge of the outer core portion 34.

[0060] Furthermore, in this configuration, each pole-forming section 32 is provided with one first fitting section 43 and one second fitting section 45. In other words, a single pole-forming section 32 is not provided with both the first and second uneven sections 61 and 62 second fitting sections 45. Therefore, multiple second fitting sections 45, which have a greater magnetic resistance than the first fitting section 43, are not provided in a single pole-forming section 32, and as a result, it is possible to suppress the increase in magnetic resistance in the pole-forming section 32.

[0061] In the configuration shown in Figure 10, each first pole forming section 41 may be provided with a first fitting section 43 for the first and second uneven groups 61 and 62, respectively, and each second pole forming section 42 may be provided with a second fitting section 45 for the first and second uneven groups 61 and 62, respectively. Also, in the configuration shown in Figure 10, the core sheet 24 has only two uneven groups (first and second uneven groups 61 and 62), but it is not limited to this and may have three or more uneven groups. Even when there are three or more uneven groups, the reference circle that serves as the basis for arranging the uneven groups is set to have different diameters for each uneven group.

[0062] In the core sheet 24 of the above embodiment, the centers 43a and 45a of the first fitting portion 43 and the second fitting portion 45 may be set radially inward from the radial center line 34a of the outer core portion 34.

[0063] In the above embodiment, the rotational angle θa is not limited to θa = θ1 + θ2, but can be changed as appropriate. That is, in the above embodiment, the rotational angle θa can be θa = (θ1 × (2N-1)) + θ2 (where N is an integer of 1 or more).

[0064] Multiple core sheets 24 may be stacked while rotated by an accumulation angle θa at intervals. In this case, core sheets 24 that are not stacked in a rotated state are joined to each other by the fitting of the first fitting portion 43 and the recess 44.

[0065] In the core sheet 24 of the above embodiment, the first fitting portion 43 and the second fitting portion 45 are arranged alternately in the circumferential direction for a plurality of pole forming portions 32, but the invention is not particularly limited to this. For example, a configuration in which a plurality of first fitting portions 43 and a plurality of second fitting portions 45 are arranged continuously in the circumferential direction is also possible. Furthermore, it is not necessary to provide a first fitting portion 43 or a second fitting portion 45 for all of the plurality of pole forming portions 32. For example, the first fitting portion 43 and the second fitting portion 45 may be provided alternately for every other pole forming portion 32 in the circumferential direction. Depending on the arrangement of the first fitting portion 43 and the second fitting portion 45, it is possible to set the shift angle θa to θa = (θ1 × N) + θ2 (where N is an integer of 1 or more).

[0066] The center 43a of the first fitting portion 43 may be set to a position offset in the circumferential direction with respect to the circumferential center C1 of the first magnetic pole forming portion 41. In this case, the offset angle of the first fitting portion 43 must be different from the offset angle θ2 of the second fitting portion 45. Such a configuration makes it possible to improve the degree of freedom in the arrangement of the first fitting portion 43.

[0067] In the above embodiment and the core sheet 24 shown in Figure 10, the concave and convex relationship of the first fitting portion 43 and the second fitting portion 45 may be reversed. That is, the first fitting portion 43 may have a concave shape that is recessed in the axial direction, and the second fitting portion 45 may have a convex shape that protrudes in the axial direction.

[0068] The number of poles of the rotor 20, that is, the number of magnetic pole forming portions 32 in one core sheet 24, is not limited to 8 as in the above embodiment, but may be set to 7 or fewer, or 9 or more. The axial shape of the magnet hole 33 is not limited to the above embodiment, and may be a U-shape or other folded shape that protrudes radially inward from the core sheet 24. It may also be an I-shape or other shape other than a folded shape.

[0069] The first fitting portion 43 and the second fitting portion 45 in the above embodiment can be applied to the core sheet forming the stator core 11. This disclosure is described in accordance with the embodiments, but it is understood that this disclosure is not limited to such embodiments or structures. This disclosure also includes various modifications and variations within the scope of equivalence. In addition, various combinations and forms, as well as other combinations and forms that include only one, more, or less of those elements, fall within the scope and concept of this disclosure.

[0070] (Note) The features of this invention are as follows. [1] A core (22) of a rotating electric machine, comprising a plurality of core sheets (24) stacked in the axial direction, each having a plurality of magnetic pole forming portions (32) at equal intervals in the circumferential direction, wherein each of the plurality of core sheets has a first fitting portion (43) and a second fitting portion (45), one of the first fitting portion and the second fitting portion being convex in the axial direction, and the other of the first fitting portion and the second fitting portion being concave in the axial direction, and a pair of the core sheets that overlap in the axial direction are joined to each other by fitting the first fitting portion of one core sheet and the second fitting portion of the other core sheet, and the first fitting portion and the second fitting portion provided on the same core sheet are provided in positions that do not overlap each other in the axial direction, the core of a rotating electric machine. According to the above core of a rotating electric machine, the first fitting portion is not involved in the formation of the second fitting portion. Therefore, the degree of freedom in setting the formation position of the second fitting portion is increased, and as a result, it becomes possible to easily secure the amount of circumferential displacement of the skew structure.

[0071] [2] The core of a rotating electric machine according to [1], wherein each core sheet comprises a plurality of pole forming portions including a first pole forming portion (41) provided with the first fitting portion and a second pole forming portion (42) provided with the second fitting portion, the center (43a) of the first fitting portion being set on the circumferential center (C1) of the first pole forming portion and the center (45a) of the second fitting portion being set at a position offset in the circumferential direction with respect to the circumferential center (C2) of the second pole forming portion.

[0072] [3] The core of a rotating electric machine according to [1], wherein each core sheet comprises a plurality of pole forming portions including a first pole forming portion (41) provided with the first fitting portion and a second pole forming portion (42) provided with the second fitting portion, the center (43a) of the first fitting portion being set at a position offset in the circumferential direction with respect to the circumferential center (C1) of the first pole forming portion, and the center (45a) of the second fitting portion being set at a position offset in the circumferential direction with respect to the circumferential center (C2) of the second pole forming portion.

[0073] [4] The core of a rotating electric machine as described in [2], wherein the relationship between the distance r from the central axis (L1) of the core sheet to the center of the second fitting portion, the offset angle θ2 of the second fitting portion, and the thickness t of the core sheet is configured to satisfy 0.1t ≤ r × sin(θ2).

[0074] [5] The core of a rotating electric machine as described in [2] or [4], wherein the plurality of core sheets are stacked with each sheet or set of sheets rotated by a shift angle θa, and when the pitch angle of the plurality of magnetic pole forming portions is θ1 and the offset angle of the second fitting portion is θ2, the shift angle θa is θa = (θ1 × N) + θ2 (where N is an integer of 1 or more).

[0075] [6] The core of a rotating electric machine according to any one of [2] to [5], wherein the plurality of pole forming portions are arranged alternately in the circumferential direction by the first pole forming portion and the second pole forming portion.

[0076] [7] The core of a rotating electric machine according to any one of [2] to [6], wherein the first fitting portion is convex in the axial direction, and the second fitting portion is a through hole that penetrates the core sheet in the axial direction.

[0077] [8] The core of a rotating electric machine according to any one of [2] to [7], wherein the offset angle (θ2) of the second fitting portion in each of the core sheets is the same. [9] The core of a rotating electric machine according to any one of [2] to [7], wherein the plurality of core sheets include core sheets having different offset angles (θ2) of the second fitting portion.

[0078]

[10] The core of a rotating electric machine according to any one of [1] to [9], wherein the first fitting portion or the second fitting portion, which is recessed in the axial direction, is a through hole that penetrates the core sheet in the axial direction.

[0079]

[11] The core of a rotating electric machine according to any one of [1] to

[10] , wherein the first fitting portion is convex in the axial direction, the second fitting portion is concave in the axial direction, each core sheet has a recess (44) formed on the back side of the first fitting portion during press molding of the first fitting portion, and the center (43a) of the first fitting portion and the center (44a) of the recess (44a) are located on the same straight line (L2) along the axial direction.

[0080]

[12] The core of the rotating electric machine is a rotor core (22) used in the rotor (20) of the rotating electric machine (M), wherein each of the plurality of magnetic pole forming portions in each core sheet has a magnet hole (33) in which a permanent magnet (23) is disposed inside, and the magnet hole has a folded shape that protrudes radially inward, the core of the rotating electric machine according to any one of [1] to

[11] .

[0081]

[13] The core of a rotating electric machine according to

[12] , wherein each of the plurality of pole forming portions in the core sheet has an outer core portion (34) which is a portion radially outside the magnet hole, and the first fitting portion and the second fitting portion are provided on the outer core portion, respectively.

[0082]

[14] The core of a rotating electric machine according to any one of [1] to

[13] , wherein each core sheet comprises a first group of protrusions (61) consisting of a first fitting portion and a second fitting portion arranged on a first reference circle (X1) centered on the central axis (L1) of the core sheet, and a second group of protrusions (62) consisting of a first fitting portion and a second fitting portion arranged on a second reference circle (X2) centered on the central axis and having a smaller diameter than the first reference circle.

[0083]

[15] A rotating electric machine (M) comprising a rotor (20) having a rotor core (22) and a stator (10) having a stator core (11), wherein at least one of the rotor core and the stator core is made up of a plurality of core sheets (24) stacked in the axial direction, each of the plurality of core sheets having a first fitting portion (43) and a second fitting portion (45), one of the first fitting portion and the second fitting portion being convex in the axial direction, the other of the first fitting portion and the second fitting portion being concave in the axial direction, a pair of core sheets overlapping in the axial direction are joined to each other by fitting the first fitting portion of one core sheet and the second fitting portion of the other core sheet, and the first fitting portion and the second fitting portion provided on the same core sheet are provided in positions that do not overlap each other in the axial direction. According to the rotating electric machine described above, the first mating portion does not participate in the formation of the second mating portion. Therefore, the degree of freedom in setting the formation position of the second mating portion is increased, and as a result, it becomes possible to easily secure the circumferential displacement amount of the skew structure.

[0084] The technical philosophy is described below. The core (22) of a rotating electric machine is formed by stacking a plurality of core sheets (24) in the axial direction, each of which has a plurality of magnetic pole forming portions (32) at equal intervals in the circumferential direction, and each of the plurality of core sheets has a first fitting portion (43) and a second fitting portion (45), one of the first fitting portion and the second fitting portion being convex in the axial direction, and the other of the first fitting portion and the second fitting portion being concave in the axial direction, and a pair of the core sheets that overlap in the axial direction are joined to each other by fitting the first fitting portion of one core sheet and the second fitting portion of the other core sheet, and the first fitting portion and the second fitting portion provided on the same core sheet overlap each other in the axial direction. The core of a rotating electric machine is provided in a position where it is not located, and each core sheet comprises a first group of protrusions (61) consisting of a first fitting portion and a second fitting portion arranged on a first reference circle (X1) centered on the central axis (L1) of the core sheet, and a second group of protrusions (62) consisting of a first fitting portion and a second fitting portion arranged on a second reference circle (X2) centered on the central axis and having a smaller diameter than the first reference circle, wherein the magnetic pole forming portion having the first fitting portion in the first group of protrusions is provided with the second fitting portion in the second group of protrusions, and the magnetic pole forming portion having the first fitting portion in the second group of protrusions is provided with the second fitting portion in the first group of protrusions.

[0085] The core of the rotating electric machine described above, wherein each core sheet comprises a plurality of pole forming portions including a first pole forming portion (41) provided with the first fitting portion and a second pole forming portion (42) provided with the second fitting portion, the center (43a) of the first fitting portion is set on the circumferential center (C1) of the first pole forming portion, and the center (45a) of the second fitting portion is set at a position offset in the circumferential direction with respect to the circumferential center (C2) of the second pole forming portion.

[0086] The core of the rotating electric machine described above, wherein each of the core sheets includes a plurality of pole forming portions, a first pole forming portion (41) provided with the first fitting portion, and a second pole forming portion (42) provided with the second fitting portion, the center (43a) of the first fitting portion being set at a position offset in the circumferential direction with respect to the circumferential center (C1) of the first pole forming portion, and the center (45a) of the second fitting portion being set at a position offset in the circumferential direction with respect to the circumferential center (C2) of the second pole forming portion.

[0087] The core of the rotating electric machine described above, wherein the relationship between the distance r from the central axis (L1) of the core sheet to the center of the second fitting portion, the offset angle θ2 of the second fitting portion, and the thickness t of the core sheet is configured to satisfy 0.1t ≤ r × sin(θ2).

[0088] The core of the rotating electric machine described above, wherein the plurality of core sheets are stacked with each sheet or set of sheets rotated by a shift angle θa, and when the pitch angle of the plurality of magnetic pole forming portions is θ1 and the offset angle of the second fitting portion is θ2, the shift angle θa is θa = (θ1 × N) + θ2 (where N is an integer of 1 or more).

[0089] The core of the rotating electric machine described above, wherein the plurality of magnetic pole forming portions are configured by arranging a plurality of first magnetic pole forming portions and second magnetic pole forming portions alternately in the circumferential direction. The core of the rotating electric machine described above, wherein the first fitting portion is convex in the axial direction, and the second fitting portion is a through hole (45) that penetrates the core sheet in the axial direction.

[0090] The core of the rotating electric machine described above, wherein the offset angle (θ2) of the second fitting portion in each of the core sheets is the same. The core of the rotating electric machine described above, wherein the plurality of core sheets include core sheets having different offset angles (θ2) of the second fitting portion.

[0091] The core of the rotating electric machine described above, wherein the first fitting portion or the second fitting portion, which is recessed in the axial direction, is a through hole (45) that penetrates the core sheet in the axial direction. The core of the rotating electric machine described above, wherein the first fitting portion is convex in the axial direction, the second fitting portion is concave in the axial direction, each core sheet has a recess (44) formed on the back side of the first fitting portion during press molding of the first fitting portion, and the center (43a) of the first fitting portion and the center (44a) of the recess (44a) are located on the same straight line (L2) along the axial direction.

[0092] The core of the rotating electric machine is a rotor core (22) used in the rotor (20) of the rotating electric machine (M), and in each of the multiple magnetic pole forming portions in each of the core sheets, each of the magnetic pole forming portions has a magnet hole (33) in which a permanent magnet (23) is arranged inside, and the magnet hole has a folded shape that protrudes radially inward, the core of the rotating electric machine described above.

[0093] The core of the rotating electric machine described above, wherein each of the plurality of magnetic pole forming portions in the core sheet has an outer core portion (34) which is the radially outer portion of the magnet hole, and the first fitting portion and the second fitting portion are provided on the outer core portion, respectively.

[0094] A rotating electric machine (M) comprising a rotor (20) having a rotor core (22) and a stator (10) having a stator core (11), wherein at least one of the rotor core and the stator core is formed by stacking a plurality of core sheets (24) in the axial direction, each of the plurality of core sheets having a first fitting portion (43) and a second fitting portion (45), one of the first fitting portion and the second fitting portion being convex in the axial direction, and the other of the first fitting portion and the second fitting portion being concave in the axial direction, and a pair of the core sheets overlapping in the axial direction are joined to each other by fitting the first fitting portion of one core sheet and the second fitting portion of the other core sheet, and the same core sheet The first fitting portion and the second fitting portion provided on the core sheet are positioned so as not to overlap each other in the axial direction, and each core sheet comprises a first group of protrusions (61) consisting of the first fitting portion and the second fitting portion arranged on a first reference circle (X1) centered on the central axis (L1) of the core sheet, and a second group of protrusions (62) consisting of the first fitting portion and the second fitting portion arranged on a second reference circle (X2) centered on the central axis and having a smaller diameter than the first reference circle, and the pole forming portion having the first fitting portion in the first group of protrusions is provided with the second fitting portion in the second group of protrusions, and the pole forming portion having the first fitting portion in the second group of protrusions is provided with the second fitting portion in the first group of protrusions, in a rotating electric machine. [Explanation of Symbols]

[0095] 10 Stator, 11 Stator core, 20 Rotor, 22 Rotor core, 23 Permanent magnet, 24 Core sheet, 32 Magnetic pole forming section, 33 Magnet hole, 34 Outer core section, 41 42 First pole forming section, 43 Second pole forming section, 43 First fitting section, 43a Center, 44 Recess, 44a Center, 45 Second fitting section (through hole), 45a Center, 61 First group of protrusions and recesses, 62 Second group of protrusions and recesses, L2 Straight line, r Distance, t Plate thickness, θ1 Pitch angle, θ2 Offset angle, θa Rolled area angle, C1 Circumferential center of the first pole forming section, C2 Circumferential center of the second pole forming section, L1 Central axis, M Rotating electric machine, X1 First reference circle, X2 Second reference circle.

Claims

1. A permanent magnet (23) made of bonded magnets, A rotor (20) comprising a rotor core (22) having a plurality of core sheets (24) stacked in the axial direction, each having a plurality of magnetic pole forming portions (32) at equal intervals in the circumferential direction, each having a magnetic hole (33) for the permanent magnets to be placed, Each of the plurality of core sheets has a first fitting portion (43) and a second fitting portion (45), One of the first fitting portion and the second fitting portion has a convex shape that protrudes in the axial direction. The other of the first fitting portion and the second fitting portion is concave in the axial direction. The first fitting portion and the second fitting portion, which are provided on the same core sheet, are positioned so as not to overlap each other in the axial direction. The core sheets that overlap in the axial direction are joined to each other by the fitting of their first fitting portion and second fitting portion, so that the magnetic pole forming portion of each of the core sheets stacked in the axial direction forms a skew structure. The aforementioned magnet hole has a folded shape that protrudes radially inward. Rotor.

2. Each of the aforementioned core sheets is A first group of protrusions (61) consisting of a first fitting portion and a second fitting portion, which are arranged on a first reference circle (X1) centered on the central axis (L1) of the core sheet, The system includes a second group of protrusions (62) consisting of a first fitting portion and a second fitting portion, which are arranged on a second reference circle (X2) having a smaller diameter than the first reference circle and centered on the aforementioned central axis. The magnetic pole forming portion having the first fitting portion in the first group of protrusions is provided with the second fitting portion in the second group of protrusions, The magnetic pole forming portion having the first fitting portion in the second group of protrusions is provided with the second fitting portion in the first group of protrusions. The rotor according to claim 1.

3. In each of the core sheets, the plurality of pole forming portions include a first pole forming portion (41) provided with the first fitting portion and a second pole forming portion (42) provided with the second fitting portion. The center (43a) of the first fitting portion is set on the circumferential center (C1) of the first magnetic pole forming portion, The center (45a) of the second fitting portion is set at a position offset in the circumferential direction with respect to the circumferential center (C2) of the second magnetic pole forming portion. The rotor according to claim 1.

4. In each of the core sheets, the plurality of pole forming portions include a first pole forming portion (41) provided with the first fitting portion and a second pole forming portion (42) provided with the second fitting portion. The center (43a) of the first fitting portion is set at a position offset in the circumferential direction with respect to the circumferential center (C1) of the first magnetic pole forming portion. The center (45a) of the second fitting portion is set at a position offset in the circumferential direction with respect to the circumferential center (C2) of the second magnetic pole forming portion. The rotor according to claim 1.

5. The relationship between the distance r from the central axis (L1) of the core sheet to the center of the second fitting portion, the offset angle θ2 of the second fitting portion, and the thickness t of the core sheet is configured to satisfy 0.1t ≤ r × sin(θ2). The rotor according to claim 3.

6. The aforementioned multiple core sheets are stacked, each one or each set of sheets rotated by an accumulation angle θa. When the pitch angle of the plurality of magnetic pole forming portions is θ1 and the offset angle of the second fitting portion is θ2, the cumulative angle θa is θa = (θ1 × N) + θ2 (where N is an integer of 1 or more). The rotor according to claim 3.

7. The plurality of magnetic pole forming sections are configured such that the first magnetic pole forming section and the second magnetic pole forming section are arranged alternately in the circumferential direction. The rotor according to claim 3.

8. The first fitting portion has a convex shape that protrudes in the axial direction, The second fitting portion is a through hole (45) that penetrates the core sheet in the axial direction. The rotor according to claim 3.

9. The offset angle (θ2) of the second fitting portion in each of the aforementioned core sheets is the same. The rotor according to claim 3.

10. The plurality of core sheets include core sheets with different offset angles (θ2) of the second fitting portion. The rotor according to claim 3.

11. The first or second fitting portion, which is recessed in the axial direction, is a through hole (45) that penetrates the core sheet in the axial direction. The rotor according to claim 1.

12. The first fitting portion has a convex shape that protrudes in the axial direction, The second fitting portion has a concave shape that is recessed in the axial direction. Each of the core sheets has a recess (44) on the back side of the first fitting portion that is formed during press molding of the first fitting portion. The center (43a) of the first fitting portion and the center (44a) of the recess are located on the same straight line (L2) along the axial direction. The rotor according to claim 1.

13. In each of the core sheets, each of the plurality of magnetic pole forming portions has an outer core portion (34) which is the radially outer portion of the magnet hole, The first fitting portion and the second fitting portion are provided on the outer core portion, The rotor according to claim 1.

14. A rotating electric machine (M) comprising a rotor (20) and a stator (10), The rotor is A permanent magnet (23) made of bonded magnets, The rotor core (22) is made up of multiple core sheets (24) stacked in the axial direction, each having a plurality of magnetic pole forming portions (32) at equal intervals in the circumferential direction, each having a magnetic hole (33) for which the permanent magnets are arranged. Each of the plurality of core sheets has a first fitting portion (43) and a second fitting portion (45), One of the first fitting portion and the second fitting portion has a convex shape that protrudes in the axial direction. The other of the first fitting portion and the second fitting portion is concave in the axial direction. The first fitting portion and the second fitting portion, which are provided on the same core sheet, are positioned so as not to overlap each other in the axial direction. The core sheets that overlap in the axial direction are joined to each other by the fitting of their first fitting portion and second fitting portion, so that the magnetic pole forming portion of each of the core sheets stacked in the axial direction forms a skew structure. The aforementioned magnet hole has a folded shape that protrudes radially inward. Rotating electric machine.

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