Rotor and rotary electric machine

Abstract

To provide a rotor and a rotary electric machine capable of improving strength of a rotor core against vibration in an axial direction.SOLUTION: Each of the plurality of core sheets 30 constituting the rotor core 22 has a first magnet through hole 31 and a second magnet through hole 32. The magnet housing hole 24 is formed by overlapping the first magnet through hole 31 and the second magnet through hole 32 in the axial direction. The inner surface of the magnet housing hole 24 is provided with a first uneven portion 43, a second uneven portion 44, and a third uneven portion 45 that are formed by a difference in position between the peripheral edge portions of the first magnet through hole 31 and the second magnet through hole 32. Further, the inner surface of the magnet housing hole 24 is provided with a non-uneven portion 46 where the first uneven portion 43, the second uneven portion 44, and the third uneven portion 45 are not formed. The permanent magnet 23 has an engaging portion that enters the recessed portion of each of the first uneven portion 43, the second uneven portion 44, and the third uneven portion 45.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an embedded magnet rotor and a rotating electric machine. [Background technology]

[0002] In rotating electrical machines, an embedded magnet rotor, in which permanent magnets are embedded inside a rotor core, is well known. The embedded magnet rotor is configured to obtain reluctance torque from an outer core portion located radially outward of the permanent magnets in addition to magnetic torque from the permanent magnets.

[0003] In such embedded magnet rotors, for example, the rotor described in Patent Document 1 has permanent magnets folded in a V- or U-shaped configuration that convexly faces inward in the radial direction when viewed in the axial direction. This configuration makes it possible to enlarge the magnet surface of the permanent magnet in contact with the outer core portion and the outer core portion itself. This means that a higher torque can be expected for the rotating electric machine. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-70032 Summary of the Invention [Problem to be solved by the invention]

[0005] The object of the present invention is to provide a rotor and a rotating electric machine comprising a rotor core having a plurality of magnet accommodating holes that form a convex folded shape radially inward, and permanent magnets embedded in the magnet accommodating holes, wherein the rotor core is formed by stacking a plurality of core sheets in the axial direction, each of the plurality of core sheets having a magnet through hole, the magnet accommodating holes being formed by the magnet through holes of the plurality of core sheets overlapping in the axial direction, the inner surface of the magnet accommodating hole being provided with an uneven portion, and the permanent magnets having engaging portions that fit into the recesses of the uneven portion. [Means for solving the problem]

[0006] The rotor that solves the above problem is a rotor (20) including a rotor core (22) having a plurality of magnet accommodating holes (24) that are folded back to convexly inward in the radial direction, and permanent magnets (23) embedded in the magnet accommodating holes, wherein the rotor core is formed by stacking a plurality of core sheets (30) in the axial direction, each of the plurality of core sheets having a magnet through hole (31, 32), and the magnet through holes of the plurality of core sheets overlap in the axial direction to form the magnet accommodating holes, and The inner surface is provided with uneven portions (43, 44, 45), the permanent magnet has engagement portions (51, 52, 53) that fit into the recesses (43a, 44a, 45a) of the uneven portions, the rotor core has an outer core portion (25) that is a portion radially outward from the permanent magnet, the inner surface of the magnet accommodating hole includes an inner side surface (41) that forms the outer core portion and an outer side surface (42) that faces the inner side surface, and the uneven portion is provided on at least one of the inner side surface and the outer side surface.

[0007] A rotor that solves the above problem is a rotor (20) that includes a rotor core (22) having a plurality of magnet accommodating holes (24) that form a convex folded shape radially inward, and permanent magnets (23) embedded in the magnet accommodating holes, wherein the rotor core is formed by stacking a plurality of core sheets (30) in the axial direction, each of the plurality of core sheets having a magnet through hole (31, 32), the magnet accommodating holes being formed by the magnet through holes of the plurality of core sheets overlapping in the axial direction, the inner surface of the magnet accommodating hole is provided with uneven portions (43, 44, 45), the permanent magnets have engagement portions (51, 52, 53) that fit into the recesses (43a, 44a, 45a) of the uneven portions, and the permanent magnets are present throughout the axial direction of the magnet accommodating hole between the inner surfaces facing each other in the hole width direction of the magnet accommodating hole at the location including the uneven portions.

[0008] The rotating electric machine that solves the above problem is a rotating electric machine (M) that includes a rotor (20) that includes a rotor core (22) having a plurality of magnet accommodating holes (24) that are folded back to convexly inward in the radial direction, and permanent magnets (23) embedded in the magnet accommodating holes, and a stator (10) that applies a rotating magnetic field to the rotor, wherein the rotor core is formed by stacking a plurality of core sheets (30) in the axial direction, each of the plurality of core sheets having magnet through holes (31, 32), and the magnet through holes of the plurality of core sheets overlap in the axial direction, thereby forming a rotating magnetic field. The magnet accommodating hole is configured, and the inner surface of the magnet accommodating hole has uneven portions (43, 44, 45), the permanent magnet has engagement portions (51, 52, 53) that fit into the recesses (43a, 44a, 45a) of the uneven portions, the rotor core has an outer core portion (25) that is radially outer than the permanent magnet, the inner surface of the magnet accommodating hole includes an inner side surface (41) that forms the outer core portion and an outer side surface (42) that faces the inner side surface, and the uneven portion is provided on at least one of the inner side surface and the outer side surface.

[0009] The rotating electric machine that solves the above problem is a rotating electric machine (M) including: a rotor (20) including a rotor core (22) having a plurality of magnet accommodating holes (24) that are folded back to convexly inward in the radial direction; permanent magnets (23) embedded in the magnet accommodating holes; and a stator (10) that applies a rotating magnetic field to the rotor, wherein the rotor core is formed by stacking a plurality of core sheets (30) in the axial direction, and each of the plurality of core sheets has magnet through holes (31, 32). ), and the magnet accommodating hole is formed by the magnet through holes of the plurality of core sheets overlapping in the axial direction, and the inner surface of the magnet accommodating hole is provided with uneven portions (43, 44, 45), and the permanent magnet has engaging portions (51, 52, 53) that fit into the recesses (43a, 44a, 45a) of the uneven portions, and the permanent magnet is present over the entire axial direction of the magnet accommodating hole between the inner surfaces facing each other in the hole width direction of the magnet accommodating hole at the location including the uneven portions. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram illustrating the configuration of a rotating electric machine having an embedded magnet rotor according to an embodiment. [Figure 2] FIG. [Figure 3] Cross-sectional view taken along line III-III in Figure 2. [Figure 4] Cross-sectional view taken along line IV-IV in Figure 2. [Figure 5] (a) and (b) are plan views of the core sheet used in the rotor in the same configuration. [Figure 6] FIG. 10 is a cross-sectional view of a rotor according to a modified example. [Figure 7] FIG. 10 is a cross-sectional view of a rotor according to a modified example. [Figure 8] FIG. 10 is a cross-sectional view of a rotor according to a modified example. [Figure 9] FIG. 10 is a cross-sectional view of a rotor according to a modified example. [Figure 10] FIG. 10 is a plan view of a rotor according to a modified example. [Figure 11] 11 is a cross-sectional view taken along line XI-XI in FIG. [Figure 12] FIG. 10 is a plan view of a rotor according to a modified example. [Figure 13] 13 is a cross-sectional view taken along line XIII-XIII in FIG. 12. DETAILED DESCRIPTION OF THE INVENTION

[0011] An embodiment of a rotor and a rotating electrical machine will be described below. 1 is configured as an embedded magnet brushless motor. The rotating electric machine M includes a substantially annular stator 10 and a substantially cylindrical rotor 20 rotatably disposed in a radially inner space of the stator 10. The stator 10 applies a rotating magnetic field to the rotor 20.

[0012] The stator 10 includes a substantially annular stator core 11. The stator core 11 is made of a magnetic metal material, e.g., a laminate of multiple electromagnetic steel sheets. The stator core 11 has twelve teeth 12, which extend radially inward and are equally spaced circumferentially in this embodiment. Each tooth 12 has the same shape. The radially inner ends of the teeth 12 are substantially T-shaped, and the tip surfaces 12a are arc-shaped, conforming to the outer circumferential surface of the rotor 20. Each of the twelve teeth 12 is wound with a winding 13 in a concentrated winding manner. In other words, the stator 10 has twelve magnetic poles. The windings 13 are connected in three phases and function as U, V, and W phases, respectively, as shown in FIG. 1 . When power is supplied to the windings 13, a rotating magnetic field is generated in the stator 10 to rotate the rotor 20. In such a stator 10, the outer peripheral surface of the stator core 11 is fixed to the inner peripheral surface of the housing 14.

[0013] (Rotor core 22) The rotor 20 includes a rotating shaft 21, a substantially cylindrical rotor core 22 into whose center the rotating shaft 21 is fitted, and eight permanent magnets 23 in this embodiment that are embedded inside the rotor core 22. In other words, the rotor 20 has eight magnetic poles. The rotor 20 is rotatably disposed relative to the stator 10 with the rotating shaft 21 supported by a bearing (not shown) provided in the housing 14.

[0014] As shown in Fig. 2, the rotor core 22 has magnet accommodating holes 24 for accommodating permanent magnets 23. In this embodiment, eight magnet accommodating holes 24 are provided at equal intervals around the rotor core 22. Each magnet accommodating hole 24, for example, penetrates the rotor core 22 along the axial direction. When viewed from the axial direction, each magnet accommodating hole 24 has a generally V-shaped folded shape that protrudes radially inward. That is, each magnet accommodating hole 24 has, for example, a pair of straight portions 24a that are linear when viewed from the axial direction, and a bent portion 24b that connects radially inner ends of the pair of straight portions 24a.

[0015] In each magnet accommodating hole 24, the radially outer end 24c of each straight portion 24a is located near the outer peripheral surface 22a of the rotor core 22. The bent portion 24b is located near the shaft insertion hole 22b at the center of the rotor core 22, into which the rotating shaft 21 is inserted. The bent portion 24b is located within the range of a reference circle C1 having a diameter that is half the outer diameter of the rotor core 22. The reference circle C1 is a circle whose center is the axis L of the rotor 20. The radially outer end 24c of the straight portion 24a is located outside the range of the reference circle C1. The magnet accommodating holes 24 are provided throughout the entire axial direction of the rotor core 22.

[0016] (Permanent magnet 23) In this embodiment, the permanent magnets 23 are bonded magnets formed by molding and solidifying a magnetic material made by mixing magnetic powder with resin. That is, the permanent magnets 23 are formed by using the magnet accommodating holes 24 of the rotor core 22 as a molding die, filling the magnet accommodating holes 24 with unsolidified magnetic material by injection molding without gaps, and then solidifying the material inside the magnet accommodating holes 24 after filling. Therefore, the shape of the magnet accommodating holes 24 becomes the outer shape of the permanent magnets 23. The magnetic powder used for the permanent magnets 23 in this embodiment is, for example, a samarium iron nitrogen (SmFeN) magnet, but other rare earth magnets, etc. may also be used.

[0017] As shown in FIG. 2, the permanent magnet 23 is formed directly in the magnet accommodating hole 24, and therefore has a shape corresponding to the magnet accommodating hole 24, i.e., a generally V-shaped folded shape that protrudes radially inward when viewed in the axial direction. The permanent magnet 23 has a pair of straight portions 23a and a bent portion 23b connecting the radially inner ends of the pair of straight portions 23a. The straight portions 23a of the permanent magnet 23 are located within the straight portions 24a of the magnet accommodating hole 24. The bent portions 23b of the permanent magnet 23 are located within the bent portions 24b of the magnet accommodating hole 24. The radially outer ends of the straight portions 23a are located near the outer peripheral surface 22a of the rotor core 22. Note that the permanent magnet 23 has an axisymmetric shape with respect to its circumferential center line Ls, which passes through the axis L of the rotor 20, for example.

[0018] As shown in FIG. 1 , a portion of the rotor core 22 located inside the V-shaped folded shape of the permanent magnets 23 and radially outward of the permanent magnets 23 functions as an outer core portion 25 that faces the stator 10 and generates reluctance torque. The outer core portion 25 has a generally triangular shape with one vertex facing toward the center of the rotor 20 when viewed in the axial direction. The rotor 20 has a plurality of magnetic pole portions 26, each including a permanent magnet 23 and an outer core portion 25. The number of magnetic pole portions 26 is the same as the number of permanent magnets 23, which is eight in this embodiment. That is, the rotor 20 has eight poles. The multiple magnetic pole portions 26 have the same shape. In this embodiment, the magnetic pole opening angle θm of each magnetic pole portion 26 is 45° mechanical angle. The multiple magnetic pole portions 26 are arranged at equal intervals in the circumferential direction. The rotor 20 also has eight magnetic pole boundary lines Ld, which are boundaries between adjacent magnetic pole portions 26. Each magnetic pole boundary line Ld is a line passing through the axis L of the rotor 20. Each magnetic pole portion 26 functions as an N pole and an S pole, as shown in an example in Figure 1. The rotor 20 is configured such that both magnet torque and reluctance torque can be obtained at these magnetic pole portions 26.

[0019] The permanent magnets 23, which are provided in a substantially embedded manner within the magnet accommodating holes 24 of the rotor core 22, are magnetized from the outside of the rotor core 22 using a magnetizing device (not shown) after the magnetic material has solidified so that they function as their original magnets. In this case, each permanent magnet 23 is magnetized in its own thickness direction. In this embodiment, eight permanent magnets 23 are provided circumferentially around the rotor core 22, and are magnetized so that the polarities are alternately opposite in the circumferential direction.

[0020] As shown in FIG. 2, the inner surface of the magnet accommodating hole 24 is in contact with the permanent magnet 23. The inner surface of the magnet accommodating hole 24 includes an inner side surface 41 and an outer side surface 42. The inner side surface 41 is a side surface that constitutes the outer core portion 25 and is in contact with the inside of the V-shaped folded shape of the permanent magnet 23. The outer side surface 42 is a side surface that faces the inner side surface 41 in the hole width direction. The hole width direction of the magnet accommodating hole 24 is a direction perpendicular to the extension direction of the magnet accommodating hole 24 when viewed in the axial direction. The extension direction of the magnet accommodating hole 24 is a direction that follows the approximately V-shaped folded shape when the magnet accommodating hole 24 is viewed in the axial direction. Each of the inner side surface 41 and the outer side surface 42 is a surface that follows the folded shape of the magnet accommodating hole 24 when viewed in the axial direction.

[0021] The inner side surface 41 has a first uneven portion 43. The outer side surface 42 has a second uneven portion 44. The first uneven portion 43 is provided on the inner side surface 41 at the bent portion 24b. The second uneven portion 44 is provided on the outer side surface 42 at the bent portion 24b. A third uneven portion 45 is provided on the inner surface of the magnet accommodating hole 24 in a portion corresponding to the radially outer end portion 24c of the straight portion 24a. The inner surface of the magnet accommodating hole 24 has a non-uneven portion 46, which is a portion where the first uneven portion 43, the second uneven portion 44, and the third uneven portion 45 are not formed. In this embodiment, the first uneven portion 43, the second uneven portion 44, and the third uneven portion 45 are formed partially in the extension direction of the magnet accommodating hole 24, and the non-uneven portion 46 is formed in other portions in the extension direction of the magnet accommodating hole 24.

[0022] The rotor core 22 has bridge portions 22c located outside the radially outer ends 24c of each straight portion 24a. Each bridge portion 22c connects the outer core portion 25 to a portion of the rotor core 22 other than the outer core portion 25. In this embodiment, when the rotor core 22 is viewed alone, the outer core portion 25 is supported by two bridge portions 22c.

[0023] (Configuration of core sheet 30) The rotor core 22 is formed by laminating a plurality of core sheets 30 made of electromagnetic steel sheets in the axial direction L. Each core sheet 30 has the same configuration as shown in FIG. 5(a). This makes it possible to manage each core sheet 30 as the same part. Note that the core sheet 30 shown in FIG. 5(b) appears to have a different shape from the core sheet 30 shown in FIG. 5(a), but in fact it is positioned at a second position rotated 45°, which corresponds to one magnet accommodating hole 24, or in other words, one magnetic pole, from the first position shown in FIG. 5(a).

[0024] Two types of magnet through holes with different shapes are formed in each core sheet 30. In the following description, one of the two types of magnet through holes will be referred to as a first magnet through hole 31, and the other as a second magnet through hole 32. The first magnet through holes 31 and the second magnet through holes 32 are alternately arranged every 45° in the circumferential direction in each core sheet 30.

[0025] The first magnet through hole 31 and the second magnet through hole 32 each have a generally V-shaped folded shape that convexly extends radially inward. That is, the first magnet through hole 31 has a shape in which the radially inner ends of a pair of straight portions 31a are connected by a bent portion 31b. Similarly, the second magnet through hole 32 has a shape in which the radially inner ends of a pair of straight portions 32a are connected by a bent portion 32b.

[0026] In the process of stacking the core sheets 30 to form the rotor core 22, in this embodiment, the core sheets 30 are stacked one by one so that those positioned in the first position shown in Fig. 5(a) and those positioned in the second position rotated 45° as shown in Fig. 5(b) are alternately stacked. As a result, the first magnet through holes 31 and the second magnet through holes 32 alternately overlap in the axial direction. Each magnet accommodating hole 24 is formed by the first magnet through holes 31 and the second magnet through holes 32 that overlap in the axial direction.

[0027] On the inner surface of the magnet accommodating hole 24, the first uneven portion 43, the second uneven portion 44 and the third uneven portion 45 are each formed by the difference in position of the peripheral portions of the first magnet through hole 31 and the second magnet through hole 32.

[0028] (First uneven portion 43 and second uneven portion 44) 3, the first uneven portion 43 and the second uneven portion 44 are formed by the difference in radial position between the bent portion 31b of the first magnet through hole 31 and the bent portion 32b of the second magnet through hole 32. In this embodiment, the radial width of each bent portion 31b is equal. The bent portion 31b of the first magnet through hole 31 is located radially outward of the bent portion 32b of the second magnet through hole 32.

[0029] The first uneven portion 43 has a plurality of recesses 43a in the axial direction. The permanent magnet 23 has engagement portions 51 that fit into the recesses 43a of the first uneven portion 43. Each engagement portion 51 is adapted to be caught in the corresponding recess 43a in the axial direction.

[0030] The second uneven portion 44 has a plurality of recesses 44a in the axial direction. The permanent magnet 23 has engagement portions 52 that fit into each recess 44a of the second uneven portion 44. Each engagement portion 52 is configured to hook onto each recess 44a in the axial direction. In this embodiment, the depth D1 of the recesses 43a of the first uneven portion 43 is set to be equal to the depth D2 of the recesses 44a of the second uneven portion 44 provided on the outer side surface 42. Furthermore, the depth D1 of the recesses 43a and the depth D2 of the recesses 44a each gradually become shallower, for example, as they approach the straight portion 24a.

[0031] (Third uneven portion 45) The third uneven portion 45 is formed by a difference in shape at the radially outer end portions of the straight portions 31a, 32a of the first magnet through hole 31 and the second magnet through hole 32. As shown in FIG. 5(a), a protruding portion 32c is formed at the radially outer end portion of the straight portion 32a, protruding inward in the hole width direction relative to the straight portion 31a. The protruding portion 32c is formed at the radially outer end portion of the straight portion 32a at an inner corner portion of a V-shaped turnback. The protruding portion 32c is also formed by tapering the inner corner portion.

[0032] As shown in Figure 4, the third uneven portion 45 is formed by overlapping linear portions 32a having protruding portions 32c and linear portions 31a having no protruding portions in the axial direction. The third uneven portion 45 has a plurality of recessed portions 45a in the axial direction. The recessed portions 45a are composed of linear portions 31a having no protruding portions. The permanent magnet 23 has engaging portions 53 that fit into each recessed portion 45a of the third uneven portion 45. Each engaging portion 53 is configured to hook onto each recessed portion 45a in the axial direction.

[0033] 2, the non-concave and convex portion 46 is a portion of the inner surface of the magnet accommodating hole 24 where the first concave and convex portion 43, the second concave and convex portion 44, and the third concave and convex portion 45 are not formed. In other words, when the magnet accommodating hole 24 is viewed from the axial direction, in the non-concave and convex portion 46, the positions of the peripheral edges of the first magnet through hole 31 and the second magnet through hole 32 that overlap in the axial direction are aligned.

[0034] The operation of the rotor 20 of the rotary electric machine M of this embodiment will be described. The permanent magnet 23, which is a bonded magnet filled in the magnet accommodating hole 24, engages with the first uneven portion 43, the second uneven portion 44, and the third uneven portion 45 of the magnet accommodating hole 24 in a manner similar to an anchor effect. That is, the outer core portion 25 axially engages with the V-shaped inner surface of the permanent magnet 23 via the first uneven portion 43 and the third uneven portion 45. Furthermore, the V-shaped outer surface of the permanent magnet 23 axially engages with portions of the rotor core 22 other than the outer core portion 25 via the second uneven portion 44. This makes it possible to suppress axial vibration of the outer core portion 25 with the bridge portion 22c as a fulcrum, even if an axial excitation force is applied to the rotor 20 due to, for example, an external factor.

[0035] Furthermore, a non-convexo-concave portion 46 is provided on the inner surface of the magnet accommodating hole 24. In the non-concave portion 46, no concaves or convexes are formed, such as the first concave-convex portion 43, the second concave-convex portion 44, and the third concave-convex portion 45. This makes it possible to suppress axial leakage magnetic flux that occurs due to the concave-convex boundary between the magnet accommodating hole 24 and the permanent magnet 23, compared to a configuration in which the entire inner surface of the magnet accommodating hole 24 has concave-convex portions.

[0036] The effects of this embodiment will be described. (1) The inner surface of the magnet accommodating hole 24 is provided with a first uneven portion 43, a second uneven portion 44, and a third uneven portion 45, which are formed by the difference in position between the peripheral edges of the first magnet through hole 31 and the second magnet through hole 32. The permanent magnet 23 has engaging portions 51, 52, and 53 that fit into the recesses 43a, 44a, and 45a of the first uneven portion 43, the second uneven portion 44, and the third uneven portion 45, respectively. With this configuration, the first uneven portion 43, the second uneven portion 44, and the third uneven portion 45 axially engage with the engaging portions 51, 52, and 53, respectively. This suppresses axial vibration of the outer core portion 25. As a result, deformation of the bridge portions 22c and the outer core portion 25 in the rotor core 22 can be suppressed. This improves the strength of the rotor core 22 against axial vibration.

[0037] Furthermore, the inner surface of the magnet accommodating hole 24 is provided with a non-concave / convex portion 46, which is a portion where the first concave / convex portion 43, the second concave / convex portion 44, and the third concave / convex portion 45 are not formed. This makes it possible to suppress axial leakage magnetic flux that occurs due to the unevenness of the boundary between the magnet accommodating hole 24 and the permanent magnet 23, compared to a configuration in which the entire inner surface of the magnet accommodating hole 24 has concave / convex portions.

[0038] (2) The inner surface of the magnet accommodating hole 24 includes an inner side surface 41 that forms the outer core portion 25, and an outer side surface 42 that faces the inner side surface 41. The inner side surface 41 is provided with a first uneven portion 43 and a third uneven portion 45. The outer side surface 42 is provided with a second uneven portion 44. Furthermore, a non-uneven portion 46 is provided on each of the inner side surface 41 and the outer side surface 42. With this configuration, the inner side surface 41 and the outer side surface 42 of the magnet accommodating hole 24 each have unevenness, which makes it possible to more effectively suppress vibration of the outer core portion 25. Furthermore, the non-uneven portion 46 is provided on each of the inner side surface 41 and the outer side surface 42 of the magnet accommodating hole 24. Therefore, the effect of suppressing leakage magnetic flux by providing the non-uneven portion 46 can be more suitably obtained.

[0039] (3) The first uneven portion 43 and the second uneven portion 44 are provided within the range of a reference circle C1 having a diameter half the outer diameter of the rotor core 22. The range indicated by the reference circle C1 is a range toward the radially inner side of the rotor core 22, i.e., a range that is unlikely to contribute to output. Therefore, by providing the first uneven portion 43 within the range of the reference circle C1, it is possible to minimize the reduction in output caused by providing the first uneven portion 43.

[0040] (4) The first uneven portion 43 and the second uneven portion 44 are provided on the folded-back bent portion 24b of the magnet accommodating hole 24. With this configuration, the first uneven portion 43 and the second uneven portion 44 can axially engage the radially inner end portion of the outer core portion 25, which is located away from the bridge portion 22c, with the permanent magnet 23. Therefore, the first uneven portion 43 and the second uneven portion 44 can effectively suppress axial vibration of the outer core portion 25 with the bridge portion 22c as a fulcrum.

[0041] (5) The third uneven portion 45 is provided at the radially outer end 24c of the magnet accommodating hole 24. With this configuration, vibrations in the vicinity of the radially outer end of the outer core portion 25 can be suppressed.

[0042] (6) The convex portions of the third uneven portion 45 are configured by protruding portions 32c that protrude inward in the hole width direction of the magnet accommodating hole 24. The protruding portions 32c are formed in the second magnet through holes 32. This allows the circumferential length of the bridge portions 22c corresponding to the second magnet through holes 32 to be shortened. As a result, this contributes to improving the formability of the core sheet 30.

[0043] (7) The protruding portion 32c is formed at the inner corner of the V-shaped turn-back at the radially outer end of the straight portion 32a. This makes it possible to form the third uneven portion 45 with the protruding portion 32c while minimizing the magnetic flux reduction of the permanent magnet 23. Furthermore, by providing the protruding portion 32c, the volume of the permanent magnet 23 can be reduced while minimizing the magnetic flux reduction, and therefore the output torque per unit volume of the permanent magnet 23 can be improved.

[0044] (8) The multiple core sheets 30 have the same configuration. Each core sheet 30 has a mixture of first magnet through holes 31 and second magnet through holes 32 with different shapes. Furthermore, the configuration of one magnet accommodating hole 24 includes a mixture of first magnet through holes 31 and second magnet through holes 32. With this configuration, the core sheets 30 have the same configuration, which makes parts management easier, while the first magnet through holes 31 and second magnet through holes 32 that overlap in the axial direction can form the first uneven portion 43, the second uneven portion 44, and the third uneven portion 45 in the magnet accommodating hole 24.

[0045] (9) The core sheets 30 are configured such that the first magnet through holes 31 and the second magnet through holes 32 are alternately arranged in the circumferential direction. When stacked to form the rotor core 22, the core sheets 30 are stacked alternately between a first position and a second position rotated 45° so that the first magnet through holes 31 and the second magnet through holes 32 are mixed in the configuration of one magnet accommodating hole 24. This allows for a simple stacking configuration in which each core sheet 30 is placed either in the first position or in the second position rotated by one magnet accommodating hole 24 from the first position. Furthermore, it is possible to minimize magnetic imbalance that may occur when the first magnet through holes 31 and the second magnet through holes 32, which have different shapes, are formed in one core sheet 30.

[0046] (10) The radial hole widths of the bent portions 31b, 32b of the first magnet through hole 31 and the second magnet through hole 32 are made equal. The hole widths of the bent portions 31b, 32b correspond to the thickness of the permanent magnet 23. The first uneven portion 43 and the second uneven portion 44 are formed by the difference in the radial positions of the bent portions 31b, 32b. This configuration makes it possible to form the first uneven portion 43 and the second uneven portion 44 on the inner surface of the magnet accommodating hole 24 while ensuring that the magnetic properties of the permanent magnets 23 formed in each magnet accommodating hole 24 do not differ from each other.

[0047] This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility. In the above embodiment, the protruding portion 32c is formed by tapering the inner corner of the V-shaped folded portion at the radially outer end of the straight portion 32a, but this is not limited thereto, and the protruding shape may be changed as appropriate, such as rectangular or curved.

[0048] In the above embodiment, the protruding portion 32c is provided at the inner corner of the V-shaped folded portion at the radially outer end of the straight portion 32a, but this is not limiting, and the protruding portion 32c may be provided at the outer corner of the V-shaped folded portion at the radially outer end of the straight portion 32a. Also, the protruding portion 32c may be formed in the first magnet through hole 31 instead of the second magnet through hole 32.

[0049] While each core sheet 30 is alternately positioned between the first position and the second position rotated 45°, multiple core sheets may be alternately positioned between the first and second positions. In this case, the same number of core sheets may be alternated, or different numbers of core sheets may be alternated. Figure 6 shows an example of a configuration in which every two core sheets 30 are alternately positioned between the first position and the second position rotated 45°. This configuration also provides substantially the same effects as the above embodiment.

[0050] In the above embodiment, the first magnet through holes 31 and the second magnet through holes 32 are alternately arranged in the circumferential direction of the core sheet 30, i.e., the first and second magnet through holes 31, 32 are arranged every other one, but this is not particularly limited. For example, either the first or second magnet through holes 31, 32 may be arranged every third or more.

[0051] For example, as shown in FIG. 7 , the number of projections and recesses in the first uneven portion 43 may be configured to be smaller than the number of projections and recesses in the second uneven portion 44. This configuration makes it possible to form the first uneven portion 43 on the inner side surface 41 while ensuring a large length of the inner side surface 41 in the extension direction of the magnet accommodating hole 24, and therefore a large surface area of ​​the inner side surface 41. Ensuring a large surface area of ​​the inner side surface 41 contributes to improving output. Furthermore, between the first uneven portion 43 and the second uneven portion 44, leakage magnetic flux at the first uneven portion 43 provided on the inner side surface 41 is more likely to affect output. Therefore, configuring the number of projections and recesses in the first uneven portion 43 to be smaller than the number of projections and recesses in the second uneven portion 44 results in a configuration suitable for suppressing output reduction due to leakage magnetic flux at the first uneven portion 43.

[0052] In the above embodiment, the depth D1 of the recesses 43a of the first uneven portion 43 is set to be equal to the depth D2 of the recesses 44a of the second uneven portion 44, but this is not particularly limited to this.

[0053] For example, as shown in FIG. 8 , the depth D1 of the recesses 43a of the first uneven portion 43 may be set equal to or less than the depth D2 of the recesses 44a of the second uneven portion 44. This configuration allows the second uneven portion 44 on the outer side surface 42 to preferably obtain an axial engagement force with the permanent magnet 23 while ensuring a large length of the inner side surface 41 in the extension direction of the magnet accommodating hole 24, and therefore a large surface area of ​​the inner side surface 41. Furthermore, between the first uneven portion 43 and the second uneven portion 44, leakage magnetic flux at the first uneven portion 43 provided on the inner side surface 41 is more likely to affect the output. Therefore, setting the depth D1 of the recesses 43a of the first uneven portion 43 equal to or less than the depth D2 of the recesses 44a of the second uneven portion 44 results in a configuration suitable for suppressing a decrease in output due to leakage magnetic flux at the first uneven portion 43.

[0054] 9, the depth D2 of the recesses 44a of the second uneven portion 44 may be set equal to or less than the depth D1 of the recesses 43a of the first uneven portion 43. The second uneven portion 44 provided on the outer side surface 42 can be ensured to have a longer length in the extension direction of the magnet accommodating hole 24 as viewed in the axial direction than the first uneven portion 43 provided on the inner side surface 41. Therefore, even if the depth D2 of the recesses 44a is set small to suppress a decrease in output, it is easy to ensure an engagement margin between the second uneven portion 44 and the engaging portion 52. In other words, by setting the depth D2 of the recesses 44a of the second uneven portion 44 equal to or less than the depth D1 of the recesses 43a of the first uneven portion 43, it is possible to obtain a suitable axial engagement force between the inner surface of the magnet accommodating hole 24 and the permanent magnet 23 while suppressing a decrease in output.

[0055] In the above embodiment, the radial widths of the bent portions 31b, 32b of the first magnet through hole 31 and the second magnet through hole 32 are the same. The first uneven portion 43 and the second uneven portion 44 are formed by the difference in the radial positions of the bent portions 31b, 32b, but this is not particularly limited and may be changed as appropriate.

[0056] For example, as shown in Figures 10 and 11, the first uneven portion 43 and the second uneven portion 44 may be formed by differentiating the hole widths of the bent portions 31b and 32b. In the configuration shown in the figures, the hole width of the bent portion 31b of the first magnet through hole 31 is narrower than the hole width of the bent portion 32b of the second magnet through hole 32. The radial centers of the bent portions 31b and 32b are set at the same position. With this configuration, it is possible to obtain substantially the same effect as the above embodiment. It is also possible to combine a configuration in which the positions of the bent portions 31b and 32b are different and a configuration in which the hole widths of the bent portions 31b and 32b are different.

[0057] In the rotor core 22 of the above embodiment and modified example, a connecting portion may be provided that connects opposing peripheral edge portions in the hole width direction at an intermediate position of the folded shape corresponding to the magnet accommodating hole 24. An example of a rotor provided with such a connecting portion is shown in Figures 12 and 13. Note that Figures 12 and 13 show, as an example, a configuration in which a connecting portion is added to the configuration shown in Figures 10 and 11.

[0058] 12, rotor core 22 is provided with connecting portions 61 that connect peripheral edge portions that face each other in the hole width direction at midpoints of the folded shape that corresponds to magnet accommodating holes 24. Connecting portions 61 are provided, for example, at bent portions 24b of magnet accommodating holes 24.

[0059] In this example, the connecting portion 61 is formed only in the first magnet through hole 31 out of the first magnet through hole 31 and the second magnet through hole 32. The connecting portion 61 is formed in the bent portion 31b of each first magnet through hole 31. The connecting portion 61 extends in the hole width direction of the bent portion 31b and connects between peripheral edge portions that face each other in the same direction. The widths of the connecting portions 61 of each first magnet through hole 31 in a direction perpendicular to the direction in which the connecting portions 61 extend are set to be, for example, equal to each other. Furthermore, when the core sheets 30 are stacked to form the rotor core 22, the connecting portions 61 in one magnet accommodating hole 24 are arranged in a straight line along the axial direction.

[0060] In this example, the hole width of the bent portion 31b of the first magnet through hole 31 is smaller than the hole width of the bent portion 32b of the second magnet through hole 32. Therefore, by providing the connecting portion 61 at the bent portion 31b of the first magnet through hole 31, the length of the connecting portion 61 in the hole width direction can be made shorter compared to when a connecting portion is provided at the bent portion 32b of the second magnet through hole 32.

[0061] Furthermore, in this example, no connecting portion is formed in the second magnet through hole 32. Therefore, in the bent portion 24b of the magnet accommodating hole 24, there are portions where there is no connecting portion on every other core sheet 30. The magnetic material that makes up the permanent magnet 23 fills these portions where there is no connecting portion. The connecting portion 61 is provided between the first uneven portion 43 and the second uneven portion 44. In other words, the connecting portion 61 connects the first uneven portion 43 and the second uneven portion 44.

[0062] 12 and 13, the outer core portion 25 is supported at three locations: the two bridge portions 22c that are necessarily provided in the configuration of the magnet accommodating hole 24, and the newly added connecting portion 61 located at the bent portion 24b. This improves the centrifugal force strength of the outer core portion 25. Furthermore, the three support points consisting of the two bridge portions 22c and the connecting portion 61 are arranged in a balanced manner around the outer core portion 25. This contributes to stable support of the outer core portion 25.

[0063] Furthermore, the first uneven portion 43, the second uneven portion 44, and the third uneven portion 45 formed on the inner surface of the magnet accommodating hole 24 suppress axial vibration of the outer core portion 25. Therefore, the first uneven portion 43, the second uneven portion 44, and the third uneven portion 45 can suppress deformation of the connecting portion 61 caused by axial vibration of the outer core portion 25 due to application of an axial excitation force to the rotor 20. In other words, the configuration of this example can contribute to improving both the centrifugal force strength and the axial strength of the outer core portion 25.

[0064] In this example, each core sheet 30 is disposed at the first or second position. As a result, the connecting portions 61 of the first magnet through holes 31 are located on every other core sheet 30 and do not overlap, thereby minimizing magnetic flux leakage at the connecting portions 61.

[0065] The above-described connecting portion 61 may be formed in the first magnet through hole 31 in the above-described embodiment. 12 and 13, the connecting portion 61 is formed in the first magnet through hole 31, but the connecting portion 61 may also be formed in the second magnet through hole 32. The connecting portion 61 may also be formed in both the first magnet through hole 31 and the second magnet through hole 32. In this case, the connecting portion 61 is configured to be continuous over the entire axial direction of the magnet accommodating hole 24. In other words, the permanent magnet 23, which is V-shaped when viewed in the axial direction, is configured to be divided by the connecting portion 61. In this case, the permanent magnet 23 has an overall V-shape with one portion divided by the connecting portion 61 and the other portion, i.e., a folded shape that is convex radially inward.

[0066] 12 and 13, the first magnet through hole 31 has one connecting portion 61, but two or more may be provided. In this case, the outer core portion 25 is supported at a total of four or more locations, in addition to the two bridge portions 22c that are necessarily provided due to the configuration of the magnet accommodating hole 24.

[0067] In the above example, the connecting portion 61 is provided at the bent portion 24b of the magnet accommodating hole 24, but the connecting portion 61 may be provided at a portion other than the bent portion 24b, such as the straight portion 24a. Furthermore, in the above example, the direction in which the connecting portion 61 extends is the hole width direction of the bent portion 24b of the magnet accommodating hole 24, and the radial direction of the rotor 20, but the direction may be changed as appropriate, for example, to a direction oblique to the hole width direction or to a direction other than the radial direction.

[0068] In the above embodiment, the number of first magnet through holes 31 and second magnet through holes 32 in one core sheet 30 is the same, but this is not particularly limited. That is, the number of first magnet through holes 31 in one core sheet 30 may be greater or less than the number of second magnet through holes 32. Regardless of the number of first magnet through holes 31 and second magnet through holes 32, magnetic imbalance in the circumferential direction can be suppressed by configuring the shapes of each first magnet through hole 31 and each second magnet through hole 32 to be point symmetrical about the axis L.

[0069] For example, in the above embodiment, if the number of first magnet through holes 31 is changed to two and the number of second magnet through holes 32 is changed to four, arranging the two first magnet through holes 31 at positions 180° opposite each other makes it possible to suppress magnetic imbalance in the circumferential direction. In the example shown in FIGS. 10 to 13, the hole width of the bent portion 31b of the first magnet through hole 31 is narrower than the hole width of the bent portion 32b of the second magnet through hole 32. In other words, the thickness of the bent portion 23b of the permanent magnet 23 is thinner in the first magnet through hole 31 than in the second magnet through hole 32. Therefore, by configuring the number of first magnet through holes 31 to be fewer than the number of second magnet through holes 32, it is possible to minimize the decrease in output torque. Furthermore, in the example of the above embodiment, in the process of stacking the core sheets 30, each core sheet 30 is rotated by 45°, which is one magnetic pole, but the rotation angle during stacking is not limited to 45°, which is one magnetic pole, and may be an angle other than 45°, such as two or three magnetic poles.

[0070] The position where the uneven portion is formed on the inner surface of the magnet accommodating hole 24 is not limited to that in the above embodiment and can be changed as appropriate. For example, the uneven portion may be formed on the inner surface of the magnet accommodating hole 24 in the middle of the straight portion 24a when viewed in the axial direction. Also, in the magnet accommodating hole 24 of the above embodiment, for example, any one of the first uneven portion 43, the second uneven portion 44, and the third uneven portion 45 may be omitted.

[0071] In the above embodiment, the first uneven portion 43, the second uneven portion 44, and the third uneven portion 45 are formed partially in the extension direction of the magnet accommodating hole 24, and the non-uneven portion 46 is formed in other locations in the extension direction of the magnet accommodating hole 24, but this is not particularly limited. For example, it is also possible to form uneven portions in part of the axial direction on the inner surface of the magnet accommodating hole 24, and to form non-uneven portions in locations in the axial direction other than the uneven portions.

[0072] In the above embodiment, the core sheet 30 is formed with two types of magnet through holes with different shapes, i.e., the first and second magnet through holes 31 and 32, but this is not particularly limited. For example, first and second core sheets with different shaped magnet through holes are prepared as core sheets constituting the rotor core 22. The first core sheet is formed with only a plurality of first magnet through holes 31 in the circumferential direction as magnet through holes. The second core sheet is formed with only a plurality of second magnet through holes 32 in the circumferential direction as magnet through holes. Then, the magnet accommodating hole 24 may be formed with a mixture of first magnet through holes 31 and second magnet through holes 32 in the axial direction by alternately stacking one or more first core sheets and second core sheets.

[0073] The number of magnetic poles of the rotor 20, i.e., the number of permanent magnets 23 and magnet accommodating holes 24, may be changed as appropriate. Also, the number of magnetic poles of the stator 10 may be changed as appropriate. In addition to the above, the configuration of the rotating electric machine M may be changed as appropriate.

[0074] The embodiments and modifications disclosed herein are illustrative in all respects, and the present invention is not limited to these examples. That is, the scope of the present invention is defined by the claims, and it is intended to include all modifications within the meaning and scope of the claims.

[0075] The technical concept is described below. [1] A rotor (20) comprising a rotor core (22) having a plurality of magnet accommodating holes (24) each having a convex folded shape on the radially inward side, and permanent magnets (23) embedded in the magnet accommodating holes, wherein the rotor core is formed by stacking a plurality of core sheets (30) in the axial direction, each of the plurality of core sheets having a magnet through hole (31, 32), the magnet accommodating holes being formed by the magnet through holes of the plurality of core sheets overlapping in the axial direction, the inner surface of the magnet accommodating hole being provided with uneven portions (43, 44, 45) formed by differences in the positions of the peripheral portions of the magnet through holes that overlap in the axial direction, and a non-uneven portion (46) which is a portion where the uneven portions are not formed, and the permanent magnets have engagement portions (51, 52, 53) that fit into the recesses (43a, 44a, 45a) of the uneven portions.

[0076] [2] The rotor core has an outer core portion (25) that is a portion radially outward of the permanent magnet, and the inner surface of the magnet accommodating hole includes an inner side surface (41) that forms the outer core portion and an outer side surface (42) that faces the inner side surface, and the uneven portion is provided on each of the inner side surface and the outer side surface, and the non-uneven portion is provided on each of the inner side surface and the outer side surface, as described in [1] above.

[0077] [3] The rotor according to [2] above, wherein the depth (D1) of the recess provided on the inner side surface is set to be equal to or less than the depth (D2) of the recess provided on the outer side surface. [4] The rotor according to [2] above, wherein the depth (D2) of the recess provided on the outer side surface is set to be equal to or less than the depth (D1) of the recess provided on the inner side surface.

[0078] [5] A rotor described in any one of [2] to [4] above, wherein the number of protrusions and recesses in the protrusion and recess portion provided on the inner side surface is less than the number of protrusions and recesses in the protrusion and recess portion provided on the outer side surface.

[0079] [6] The rotor according to any one of [1] to [5] above, wherein the uneven portion is provided radially inward of half the outer diameter of the rotor core. [7] The rotor according to any one of the above [1] to [6], wherein the uneven portion is provided at a radially outer end (24c) of the magnet accommodating hole.

[0080] [8] A rotor described in any one of [1] to [7] above, wherein the multiple core sheets have the same configuration, the magnet through holes have different shapes, and include a first magnet through hole (31) and a second magnet through hole (32) that are mixed in one of the core sheets, and the first magnet through hole and the second magnet through hole are mixed in the configuration of one of the magnet accommodating holes.

[0081] [9] The rotor described in [8] above, wherein the core sheet is configured such that the first magnet through holes and the second magnet through holes are arranged alternately in the circumferential direction.

[10] The rotor core is configured such that a predetermined number of the core sheets are arranged at either a first position or a second position rotated by one magnet accommodating hole from the first position, as described in [9] above.

[0082]

[11] The rotor according to any one of the above [1] to

[10] , wherein the uneven portion is provided on a bent portion (24b) of a folded-back shape of the magnet accommodating hole.

[12] A rotor described in any one of [1] to

[11] above, wherein the rotor core has a connecting portion (61) that connects the peripheral portions that face each other in the hole width direction at an intermediate position of the folded shape corresponding to the magnet accommodating hole.

[0083]

[13] The rotor according to the above

[12] , wherein the connecting portion is provided at a folded-back bent portion (24b) of the magnet accommodating hole.

[14] A rotating electric machine (M) comprising: a rotor (20) including a rotor core (22) having a plurality of magnet accommodating holes (24) each having a convex folded shape on the radially inward side; permanent magnets (23) embedded in the magnet accommodating holes; and a stator (10) for applying a rotating magnetic field to the rotor, wherein the rotor core is formed by stacking a plurality of core sheets (30) in the axial direction, each of the plurality of core sheets having magnet through holes (31, 32), A rotating electric machine in which the magnet accommodating hole is formed by the magnet through holes of the multiple core sheets overlapping in the axial direction, and the inner surface of the magnet accommodating hole is provided with uneven portions (43, 44, 45) formed by differences in the positions of the peripheral portions of the magnet through holes that overlap in the axial direction, and a non-uneven portion (46) that is a portion where the uneven portions are not formed, and the permanent magnet has engaging portions (51, 52, 53) that fit into the recesses (43a, 44a, 45a) of the uneven portions.

[0084] According to the rotor of [1] above and the rotating electric machine of

[14] above, the uneven portion of the magnet accommodating hole axially engages with the engaging portion of the permanent magnet, thereby suppressing axial vibration of the outer core portion, which is the portion of the rotor core radially outward of the permanent magnet. As a result, it is possible to suppress deformation of the rotor core. Therefore, it is possible to improve the strength of the rotor core against axial vibration. In addition, a non-uneven portion is provided on the inner surface of the magnet accommodating hole. This suppresses axial leakage magnetic flux that occurs due to the unevenness of the boundary between the magnet accommodating hole and the permanent magnet, compared to a configuration in which the entire inner surface of the magnet accommodating hole has uneven portions.

[0085] The technical concept is described below. In a rotor using a permanent magnet with a folded, radially inward convex shape, as described above, the volume of the outer core portion located radially outside the permanent magnet becomes large. Furthermore, if the radially outer end of the permanent magnet is extended close to the outer peripheral surface of the rotor core to achieve high torque, the thickness of the bridge portion, which is the portion of the rotor core between the radially outer end of the permanent magnet and the outer peripheral surface of the rotor core, becomes thinner, reducing the strength of the bridge portion. For this reason, when an axial vibration force is applied to the rotor due to an external factor, for example, the outer core portion may vibrate axially with the bridge portion as a fulcrum. Furthermore, if the vibration of the outer core portion becomes large, the rotor core may be deformed. The objective of the following technical concept is to provide a rotor and a rotating electric machine that enable the rotor core to have improved strength against axial vibration.

[0086] A rotor (20) including a rotor core (22) having a plurality of magnet accommodating holes (24) each having a folded shape convexly folded radially inward, and permanent magnets (23) embedded in the magnet accommodating holes, wherein the rotor core is formed by stacking a plurality of core sheets (30) in the axial direction, each of the plurality of core sheets having a magnet through hole (31, 32), the magnet through holes of the plurality of core sheets overlapping in the axial direction to form the magnet accommodating holes, and the inner surface of the magnet accommodating holes has peripheral edges of the magnet through holes that overlap in the axial direction. a rotor core having an outer core portion (25) that is radially outward of the permanent magnet, an inner surface of the magnet accommodating hole including an inner side surface (41) that forms the outer core portion and an outer side surface (42) that faces the inner side surface, and the inner and outer side surfaces are provided with the uneven portion (43, 44, 45) formed by differences in the positions of the portions, the permanent magnet has an engaging portion (51, 52, 53) that fits into the recessed portion (43a, 44a, 45a) of the uneven portion, the rotor core has an outer core portion (25) that is radially outward of the permanent magnet, and the inner surface of the magnet accommodating hole includes an inner side surface (41) that forms the outer core portion and an outer side surface (42) that faces the inner side surface, and the uneven portion is provided on each of the inner side surface and the outer side surface.

[0087] The rotor as described above, wherein the depth (D1) of the recess provided on the inner side surface is set to be equal to or less than the depth (D2) of the recess provided on the outer side surface. The rotor as described above, wherein the depth (D2) of the recess provided on the outer side surface is set to be equal to or less than the depth (D1) of the recess provided on the inner side surface.

[0088] The rotor described above, wherein the number of projections and recesses in the projection-recess portion provided on the inner side surface is smaller than the number of projections and recesses in the projection-recess portion provided on the outer side surface. a rotor (20) including a rotor core (22) having a plurality of magnet accommodating holes (24) each having a folded shape convexly directed radially inward, and permanent magnets (23) embedded in the magnet accommodating holes, wherein the rotor core is formed by stacking a plurality of core sheets (30) in the axial direction, each of the plurality of core sheets having a magnet through hole (31, 32), the magnet accommodating holes being formed by the magnet through holes of the plurality of core sheets overlapping in the axial direction, the inner surface of the magnet accommodating hole being provided with uneven portions (43, 44, 45) formed by differences in the positions of the peripheral portions of the magnet through holes that overlap in the axial direction, the permanent magnets having engagement portions (51, 52, 53) that fit into recesses (43a, 44a, 45a) of the uneven portions, and the uneven portions being provided radially inward of half the outer diameter of the rotor core.

[0089] a rotor (20) including a rotor core (22) having a plurality of magnet accommodating holes (24) each having a folded shape convexly directed radially inward, and permanent magnets (23) embedded in the magnet accommodating holes, wherein the rotor core is formed by stacking a plurality of core sheets (30) in the axial direction, each of the plurality of core sheets having a magnet through hole (31, 32), the magnet accommodating holes being formed by the magnet through holes of the plurality of core sheets overlapping in the axial direction, the inner surface of the magnet accommodating hole being provided with uneven portions (43, 44, 45) formed by differences in the positions of the peripheral portions of the magnet through holes that overlap in the axial direction, the permanent magnets having engagement portions (51, 52, 53) that fit into recesses (43a, 44a, 45a) of the uneven portions, and the uneven portions being provided at the radially outer end portion (24c) of the magnet accommodating hole.

[0090] A rotor (20) including a rotor core (22) having a plurality of magnet accommodating holes (24) each having a folded shape convexly folded radially inward, and permanent magnets (23) embedded in the magnet accommodating holes, wherein the rotor core is formed by stacking a plurality of core sheets (30) in the axial direction, each of the plurality of core sheets having a magnet through hole (31, 32), the magnet through holes of the plurality of core sheets overlapping in the axial direction to form the magnet accommodating holes, and the inner surface of the magnet accommodating holes has a circumferential edge portion where the magnet through holes overlap in the axial direction. a rotor having concave and convex portions (43, 44, 45) formed by differences in the position of the permanent magnets, the permanent magnets having engagement portions (51, 52, 53) that fit into concave portions (43a, 44a, 45a) of the concave and convex portions, the plurality of core sheets having the same configuration, the magnet through holes having different shapes and including a first magnet through hole (31) and a second magnet through hole (32) that are mixed and provided in one of the core sheets, and the first magnet through hole and the second magnet through hole are mixed in the configuration of one of the magnet accommodating holes.

[0091] The rotor described above, wherein the core sheet is configured such that the first magnet through holes and the second magnet through holes are alternately arranged in the circumferential direction. The rotor core is configured such that a predetermined number of the core sheets are arranged at either a first position or a second position rotated by one magnet accommodating hole from the first position.

[0092] The rotor as described above, wherein the uneven portion is provided on a bent portion (24b) of the magnet accommodating hole. The rotor according to the above, wherein the rotor core has a connecting portion (61) that connects the peripheral edge portions that face each other in the hole width direction at a midpoint of the folded shape that corresponds to the magnet accommodating hole.

[0093] The rotor as described above, wherein the connecting portion is provided at a bent portion (24b) of the magnet accommodating hole. A rotating electric machine (M) including: a rotor (20) including a rotor core (22) having a plurality of magnet accommodating holes (24) that are folded back to convexly inward in the radial direction; and permanent magnets (23) embedded in the magnet accommodating holes; and a stator (10) that applies a rotating magnetic field to the rotor, wherein the rotor core is formed by stacking a plurality of core sheets (30) in the axial direction, each of the plurality of core sheets having a magnet through hole (31, 32), the magnet through holes of the plurality of core sheets overlapping in the axial direction to form the magnet accommodating hole, and a stator (10) that applies a rotating magnetic field to the rotor. a rotor core having an outer core portion (25) that is radially outward of the permanent magnet, an inner surface of the magnet accommodating hole including an inner side surface (41) that forms the outer core portion and an outer side surface (42) that faces the inner side surface, and the uneven portion is provided on each of the inner side surface and the outer side surface.

[0094] A rotating electric machine (M) including: a rotor (20) including a rotor core (22) having a plurality of magnet accommodating holes (24) that are folded back to convexly inward in the radial direction; and permanent magnets (23) embedded in the magnet accommodating holes; and a stator (10) that applies a rotating magnetic field to the rotor, wherein the rotor core is formed by stacking a plurality of core sheets (30) in the axial direction, each of the plurality of core sheets having magnet through holes (31, 32), A rotating electric machine in which the magnet accommodating hole is formed by the magnet through holes of the core sheet overlapping in the axial direction, the inner surface of the magnet accommodating hole is provided with uneven portions (43, 44, 45) formed by the difference in position of the peripheral portions of the magnet through holes overlapping in the axial direction, the permanent magnet has engagement portions (51, 52, 53) that fit into the recesses (43a, 44a, 45a) of the uneven portions, and the uneven portions are provided radially inward of half the outer diameter of the rotor core.

[0095] A rotating electric machine (M) including: a rotor (20) including a rotor core (22) having a plurality of magnet accommodating holes (24) that are folded back to convexly inward in the radial direction; and permanent magnets (23) embedded in the magnet accommodating holes; and a stator (10) that applies a rotating magnetic field to the rotor, wherein the rotor core is formed by stacking a plurality of core sheets (30) in the axial direction, each of the plurality of core sheets having magnet through holes (31, 32), A rotating electric machine in which the magnet accommodating hole is formed by overlapping the magnet through holes of the core sheet in the axial direction, the inner surface of the magnet accommodating hole is provided with uneven portions (43, 44, 45) formed by differences in the positions of the peripheral portions of the magnet through holes that overlap in the axial direction, the permanent magnet has engagement portions (51, 52, 53) that fit into recesses (43a, 44a, 45a) of the uneven portions, and the uneven portions are provided at the radially outer end (24c) of the magnet accommodating hole.

[0096] A rotating electric machine (M) including: a rotor (20) including a rotor core (22) having a plurality of magnet accommodating holes (24) each having a folded shape convexly folded inward in the radial direction, and permanent magnets (23) embedded in the magnet accommodating holes; and a stator (10) that applies a rotating magnetic field to the rotor, wherein the rotor core is formed by stacking a plurality of core sheets (30) in the axial direction, each of the plurality of core sheets having a magnet through hole (31, 32), the magnet through holes of the plurality of core sheets overlapping in the axial direction to form the magnet accommodating hole, and an inner surface of the magnet accommodating hole has a stator (10) for axially inserting a magnet through hole. a rotating electric machine in which uneven portions (43, 44, 45) are provided which are formed by differences in the positions of the peripheral portions of the magnet through holes which overlap in the direction, the permanent magnets have engagement portions (51, 52, 53) which fit into recesses (43a, 44a, 45a) of the uneven portions, the plurality of core sheets have the same configuration, the magnet through holes have different shapes and include a first magnet through hole (31) and a second magnet through hole (32) which are mixed and provided in one of the core sheets, and the first magnet through hole and the second magnet through hole are mixed in the configuration of one of the magnet accommodating holes. [Explanation of symbols]

[0097] M rotating electric machine, 10 stator, 20 rotor, 22 rotor core, 23 permanent magnet, 23b bent portion, 24 magnet accommodating hole, 24b bent portion, 24c radially outer end portion, 25 outer core portion, 30 core sheet, 31 first magnet through hole (magnet through hole), 31b bent portion, 32 second magnet through hole (magnet through hole), 32b bent portion, 41 inner side surface, 42 outer side surface, 43 first uneven portion (uneven portion), 43a recess, 44 second uneven portion (uneven portion), 44a recess, 45 third uneven portion (uneven portion), 45a recess, 46 non-uneven portion, 51 to 53 engaging portion, 61 connecting portion, D1, D2 depth.

Claims

1. A rotor (20) comprising: a rotor core (22) having a plurality of magnet accommodating holes (24) each having a convex folded shape on the radially inward side; and permanent magnets (23) embedded in the magnet accommodating holes, The rotor core is formed by stacking a plurality of core sheets (30) in the axial direction, Each of the plurality of core sheets has a through hole (31, 32) for a magnet, The magnet through holes of the plurality of core sheets are overlapped in the axial direction to form the magnet accommodating hole, The inner surface of the magnet accommodating hole is provided with uneven portions (43, 44, 45), The permanent magnet has engaging portions (51, 52, 53) that fit into the recesses (43a, 44a, 45a) of the uneven portions, The rotor core has an outer core portion (25) that is a portion radially outward of the permanent magnet, The inner surface of the magnet accommodating hole includes an inner side surface (41) that forms the outer core portion and an outer side surface (42) that faces the inner side surface, The uneven portion is provided on at least one of the inner side surface and the outer side surface. Rotor.

2. A rotor (20) comprising: a rotor core (22) having a plurality of magnet accommodating holes (24) each having a convex folded shape on the radially inward side; and permanent magnets (23) embedded in the magnet accommodating holes, The rotor core is formed by stacking a plurality of core sheets (30) in the axial direction, Each of the plurality of core sheets has a through hole (31, 32) for a magnet, The magnet through holes of the plurality of core sheets are overlapped in the axial direction to form the magnet accommodating hole, The inner surface of the magnet accommodating hole is provided with uneven portions (43, 44, 45), The permanent magnet has engaging portions (51, 52, 53) that fit into the recesses (43a, 44a, 45a) of the uneven portions, the permanent magnet is present over the entire axial direction of the magnet accommodating hole between the inner surfaces facing each other in the hole width direction of the magnet accommodating hole at the location including the concave-convex portion. Rotor.

3. The rotor core has an outer core portion (25) that is a portion radially outward of the permanent magnet, The inner surface of the magnet accommodating hole includes an inner side surface (41) that forms the outer core portion and an outer side surface (42) that faces the inner side surface, The uneven portion is provided on each of the inner side surface and the outer side surface. The rotor of claim 2 .

4. The uneven portion is provided on each of the inner side surface and the outer side surface. The rotor of claim 1 .

5. The depth (D1) of the recess provided on the inner side surface is set to be equal to or less than the depth (D2) of the recess provided on the outer side surface. The rotor according to claim 3 or 4.

6. The depth (D2) of the recess provided on the outer side surface is set to be equal to or less than the depth (D1) of the recess provided on the inner side surface. The rotor according to claim 3 or 4.

7. the number of projections and recesses in the projection-recess portion provided on the inner side surface is smaller than the number of projections and recesses in the projection-recess portion provided on the outer side surface; A rotor according to any one of claims 3 to 6.

8. The uneven portion is provided radially inward of half the outer diameter of the rotor core. A rotor according to any one of claims 1 to 7.

9. The uneven portion is provided at a radially outer end (24c) of the magnet accommodating hole. A rotor according to any one of claims 1 to 8.

10. The plurality of core sheets have the same configuration, The magnet through holes include a first magnet through hole (31) and a second magnet through hole (32) which are different in shape and are mixedly provided in one core sheet, The first magnet through hole and the second magnet through hole are mixed in the configuration of one of the magnet accommodating holes. A rotor according to any one of claims 1 to 9.

11. The core sheet is configured such that the first magnet through holes and the second magnet through holes are alternately arranged in the circumferential direction. The rotor of claim 10.

12. The rotor core is configured such that a predetermined number of the core sheets are arranged at either a first position or a second position rotated by one magnet accommodating hole from the first position. The rotor of claim 11.

13. The uneven portion is provided on a folded-back bent portion (24b) of the magnet accommodating hole. A rotor according to any one of claims 1 to 12.

14. The rotor core has a connecting portion (61) that connects peripheral edge portions facing each other in the hole width direction at a midpoint of the folded shape corresponding to the magnet accommodating hole. A rotor according to any one of claims 1 to 13.

15. The connecting portion is provided at a folded-back bent portion (24b) of the magnet accommodating hole.

15. The rotor of claim 14.

16. a rotor (20) including a rotor core (22) having a plurality of magnet accommodating holes (24) each having a convex folded shape on the radially inward side, and permanent magnets (23) embedded in the magnet accommodating holes; a stator (10) that applies a rotating magnetic field to the rotor; A rotating electric machine (M) comprising: The rotor core is formed by stacking a plurality of core sheets (30) in the axial direction, Each of the plurality of core sheets has a through hole (31, 32) for a magnet, The magnet through holes of the plurality of core sheets are overlapped in the axial direction to form the magnet accommodating hole, The inner surface of the magnet accommodating hole is provided with uneven portions (43, 44, 45), The permanent magnet has engaging portions (51, 52, 53) that fit into the recesses (43a, 44a, 45a) of the uneven portions, The rotor core has an outer core portion (25) that is a portion radially outward of the permanent magnet, The inner surface of the magnet accommodating hole includes an inner side surface (41) that forms the outer core portion and an outer side surface (42) that faces the inner side surface, The uneven portion is provided on at least one of the inner side surface and the outer side surface. Rotating electric motor.

17. a rotor (20) including a rotor core (22) having a plurality of magnet accommodating holes (24) each having a convex folded shape on the radially inward side, and permanent magnets (23) embedded in the magnet accommodating holes; a stator (10) that applies a rotating magnetic field to the rotor; A rotating electric machine (M) comprising: The rotor core is formed by stacking a plurality of core sheets (30) in the axial direction, Each of the plurality of core sheets has a through hole (31, 32) for a magnet, The magnet through holes of the plurality of core sheets are overlapped in the axial direction to form the magnet accommodating hole, The inner surface of the magnet accommodating hole is provided with uneven portions (43, 44, 45), The permanent magnet has engaging portions (51, 52, 53) that fit into the recesses (43a, 44a, 45a) of the uneven portions, the permanent magnet is present over the entire axial direction of the magnet accommodating hole between the inner surfaces facing each other in the hole width direction of the magnet accommodating hole at the location including the concave-convex portion. Rotating electric motor.

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