Rotating electrical machine

Abstract

A rotating electric machine according to an embodiment of the present application includes a rotor rotatable about a center axis, and a stator located radially outward of the rotor. The rotor includes a rotor core having a plurality of electromagnetic steel sheets stacked in an axial direction of the center axis, and a plurality of receiving holes. The rotor also includes a plurality of magnets each received in an inside of a corresponding one of the receiving holes. The rotor core includes a first recessed portion recessed from a first core end surface on one side in the axial direction toward the other side in the axial direction, a first riveted portion provided on a bottom surface of the first recessed portion, and a first protruding portion protruding toward the magnet on an inside periphery of the receiving hole in a direction intersecting the axial direction, and abutting against a side surface of the magnet.

Description

Technical Field

[0001] This invention relates to a rotary electric motor. Background Technology

[0002] Rotary electric machines are known to have a rotor core and magnets disposed in holes provided in the rotor core. For example, Patent Document 1 describes a magnet-embedded rotor in which the end of a layer of steel plates constituting the rotor core is riveted to the end of a magnet inserted into a hole provided in the rotor core and thus fixed to the rotor core.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2002-64951 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] In the above structure, due to manufacturing tolerances and other reasons, the dimensions of the laminated steel plates are sometimes larger than the dimensions of the magnet in the direction of the central axis of the rotor core. In this case, the portion of the laminated steel plates protruding in the direction intersecting the central axis, which is achieved by riveting the steel plates at the ends in the central axis direction, either does not contact the magnet or abuts against the end of the magnet in the central axis direction. When the riveted steel plates do not contact the magnet, the magnet cannot be secured. Furthermore, when the riveted steel plates abut against the end of the magnet, the magnet may be damaged. Thus, in such a structure, it is difficult to reliably secure the magnet to the rotor core while suppressing magnet damage.

[0008] In view of the above, one of the objectives of the present invention is to provide a rotary motor that can suppress damage to the magnet and can be reliably fixed to the rotor core.

[0009] One embodiment of the rotary electric motor of the present invention includes: a rotor capable of rotating about a central axis; and a stator located radially outward of the rotor. The rotor includes: a rotor core having a plurality of electromagnetic steel plates stacked axially and having a plurality of receiving holes; and a plurality of magnets respectively housed within the plurality of receiving holes. The rotor core includes: a first recess recessed from a first core end face on one side of the axial direction to the other side; a first riveting portion provided on the bottom surface of the first recess; and a first protrusion protruding towards the magnet side in a direction intersecting the axial direction at the inner periphery of the receiving hole, and abutting against the side surface of the magnet.

[0010] The effects of the invention

[0011] According to one aspect of the present invention, a rotary motor is provided that can suppress damage to the magnet and can be reliably fixed to the rotor core. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of a rotary electric motor according to one embodiment.

[0013] Figure 2 This is a cross-sectional view showing a portion of a rotary electric motor according to one embodiment. Figure 1 Sectional view II-I in the middle.

[0014] Figure 3 This is a diagram showing a portion of the rotor core of a rotor in one embodiment, viewed from the axial direction.

[0015] Figure 4 This is a perspective view showing a portion of a rotor core according to one embodiment.

[0016] Figure 5 This is a perspective sectional view of a rotor core according to one embodiment.

[0017] Figure 6 This is a cross-sectional view of a rotor core according to one embodiment.

[0018] Figure 7 This is a cross-sectional view showing the state of a rotor core during the assembly process of one embodiment.

[0019] Figure 8 This is a cross-sectional view of the rotor core of a modified example.

[0020] In the picture:

[0021] 1—Rotating motor, 10—Rotor, 20—Rotor core, 20a—First core end face, 20b—Second core end face, 25—Electromagnetic steel plate, 25P—First electromagnetic steel plate, 25Q—Second electromagnetic steel plate, 30—Receiving hole, 40—Magnet, 40f—Magnet end face, 40s—Side side, 40t—Side side, 60—Stator, 80, 80a, 80b, 80c—First recess, 81d—Bottom surface, 81—Cutout, 82—First riveting part, 84—First protrusion, 92—Second riveting part, 94—Second protrusion, J—Central shaft. Detailed Implementation

[0022] Hereinafter, a rotary motor according to an embodiment of the present invention will be described with reference to the accompanying drawings. Furthermore, the scope of the present invention is not limited to the following embodiments, and modifications can be made freely within the scope of the technical concept of the present invention. Additionally, in the following drawings, for ease of understanding of the structures, the actual structures may sometimes differ from the scale, quantities, etc., shown in the drawings.

[0023] In the figures, the Z-axis direction, as appropriately shown, is a vertical direction with the positive side designated as "up" and the negative side as "down." The central axis J, as appropriately shown in the figures, is an imaginary line parallel to the Z-axis direction and extending vertically. In the following explanation, the axial direction of the central axis J, i.e., the direction parallel to the vertical direction, is simply referred to as "axial direction," the radial direction centered on the central axis J is simply referred to as "radial direction," and the circumferential direction centered on the central axis J is simply referred to as "circumferential direction." The arrow θ, as appropriately shown in the figures, represents the circumferential direction. When viewed from above, the arrow θ points clockwise around the central axis J. In the following explanation, using a given object as a reference, the side of the circumferential direction towards which the arrow θ points, i.e., the side that moves clockwise when viewed from above, is called "one side of the circumferential direction," and using a given object as a reference, the opposite side of the side of the circumferential direction towards which the arrow θ points, i.e., the side that moves counterclockwise when viewed from above, is called "the other side of the circumferential direction."

[0024] In addition, the terms "upper and lower direction," "upper side," and "lower side" are names used only to describe the configuration relationships of each part. The actual configuration relationships may be other than those indicated by these names.

[0025] [Rotary motor]

[0026] like Figure 1 As shown, rotary motor 1 is an internal rotor type rotary motor.

[0027] In this embodiment, the rotary motor 1 is a three-phase AC rotary motor. The rotary motor 1 is, for example, a three-phase motor driven by a three-phase AC power supply. The rotary motor 1 includes a housing 2, a rotor 10, a stator 60, a bearing bracket 4, and bearings 5a and 5b.

[0028] The housing 2 internally houses the rotor 10, stator 60, bearing bracket 4, and bearings 5a and 5b. Bearing 5b is held at the bottom of the housing 2. Bearing bracket 4 holds bearing 5a. Bearings 5a and 5b are, for example, ball bearings.

[0029] The stator 60 is located radially outside the rotor 10. The stator 60 has a stator core 61, an insulator 64, and multiple coils 65. (Example...) Figure 1 , Figure 2 As shown, the stator core 61 has a core back 62 and a plurality of teeth 63. The core back 62 is located radially outward of the rotor core 20, which will be described later.

[0030] like Figure 2 As shown, the back of the core 62 is an annular shape surrounding the rotor core 20. For example, the back of the core 62 is an annular shape centered on the central axis J.

[0031] Multiple teeth 63 extend radially inward from the back of the iron core 62. The multiple teeth 63 are arranged side-by-side at intervals in the circumferential direction. For example, the multiple teeth 63 are arranged at equal intervals around the circumference. For example, 48 teeth 63 are provided. That is, the number of slots 67 in the rotary motor 1 is, for example, 48.

[0032] like Figure 1 As shown, multiple coils 65 are mounted on the stator core 61. The multiple coils 65 are mounted on teeth 63, for example, via an insulator 64. In this embodiment, the coils 65 are wound in a distributed manner. That is, each coil 65 is wound across multiple teeth 63. In this embodiment, the coils 65 are wound with full pitch. That is, the circumferential spacing between the slots of the stator 60 into which the coils 65 are inserted is equal to the circumferential spacing of the magnetic poles generated when three-phase AC power is supplied to the stator 60. The number of poles of the rotary motor 1 is, for example, 8. That is, the rotary motor 1 is, for example, an 8-pole, 48-slot rotary motor. Thus, in the rotary motor 1 of this embodiment, when the number of poles is set to N, the number of slots is N×6.

[0033] Rotor 10 is capable of rotating about the central axis J. For example... Figure 2 As shown, the rotor 10 has a shaft 11, a rotor core 20, and multiple magnets 40. The shaft 11 is cylindrical, extending axially around the central axis J. Figure 1 As shown, shaft 11 is supported by bearings 5a and 5b so that it can rotate about the central axis J.

[0034] The rotor core 20 is a magnetic material. The rotor core 20 is fixed to the outer circumferential surface of the shaft 11. The rotor core 20 has a through hole 21 extending axially through the rotor core 20. Figure 2 As shown, viewed axially, the through hole 21 is a circle centered on the central axis J. The shaft 11 passes through the through hole 21. The shaft 11 is fixed within the through hole 21, for example, by pressing or the like. The rotor core 20 is, for example, formed by stacking multiple electromagnetic steel plates 25 axially.

[0035] like Figures 2 to 4 As shown, the rotor core 20 has a plurality of receiving holes 30. The plurality of receiving holes 30 extend through the rotor core 20, for example, along the axial direction. A plurality of magnets 40 are respectively housed inside the plurality of receiving holes 30. The plurality of receiving holes 30 includes a pair of first receiving holes 31a, 31b and a second receiving hole 32.

[0036] The types of magnets 40 are not particularly limited. Magnets 40 can be, for example, neodymium magnets or ferrite magnets. The multiple magnets 40 include a pair of first magnets 41a and 41b and a second magnet 42. The pair of first magnets 41a and 41b and the second magnet 42 constitute poles.

[0037] In this embodiment, a plurality of first receiving holes 31a and 31b, a pair of first magnets 41a and 41b, a second receiving hole 32, and a second magnet 42 are provided at intervals in the circumferential direction. For example, eight of each pair of first receiving holes 31a and 31b, a pair of first magnets 41a and 41b, a second receiving hole 32, and a second magnet 42 are provided.

[0038] The rotor 10 has multiple magnetic pole portions 70, each including a pair of first receiving holes 31a and 31b, a pair of first magnets 41a and 41b, a second receiving hole 32, and a second magnet 42. Figure 2 As shown, for example, eight magnetic pole portions 70 are provided. Multiple magnetic pole portions 70 are arranged at equal intervals around the circumference. Each of the multiple magnetic pole portions 70 includes magnetic pole portions 70N with N poles on the outer circumferential surface of the rotor core 20 and magnetic pole portions 70S with S poles on the outer circumferential surface of the rotor core 20. For example, four magnetic pole portions 70N and four magnetic pole portions 70S are provided. The four magnetic pole portions 70N and four magnetic pole portions 70S are arranged alternately around the circumference. The structure of each magnetic pole portion 70 is the same except that the magnetic poles on the outer circumferential surface of the rotor core 20 are different and their circumferential positions are different.

[0039] like Figure 3 , Figure 4 As shown, in the magnetic pole section 70, a pair of first receiving holes 31a and 31b are arranged circumferentially spaced apart from each other. The first receiving hole 31a is, for example, located on one circumferential side (+θ side) of the first receiving hole 31b. The first receiving holes 31a and 31b extend in a generally straight line in a direction inclined relative to the radial direction when viewed axially. When viewed axially, the pair of first receiving holes 31a and 31b extend in a direction circumferentially separated from each other as they move from the radially inward side to the radially outward side. That is, the circumferential distance between the first receiving holes 31a and 31b increases as they move from the radially inward side to the radially outward side. The first receiving hole 31a is, for example, located on one circumferential side as it moves from the radially inward side to the radially outward side. The first receiving hole 31b is, for example, located on the other circumferential side (-θ side) as it moves from the radially inward side to the radially outward side. The radially outer ends of the first receiving holes 31a and 31b are located at the radially outer periphery of the rotor core 20.

[0040] For example, when viewed axially, the first receiving hole 31a and the first receiving hole 31b are circumferentially separated by a space forming the d-axis. Figure 3The magnetic pole center line IL1 is shown. The magnetic pole center line IL1 is an imaginary line that passes through the circumferential center of the magnetic pole section 70 and the central axis J and extends radially. For example, when viewed axially, the first receiving hole 31a and the first receiving hole 31b are arranged linearly symmetrically with respect to the magnetic pole center line IL1. Hereinafter, for structures that are the same as the first receiving hole 31a except for the linear symmetry with respect to the magnetic pole center line IL1, the description of the first receiving hole 31b will sometimes be omitted.

[0041] The first receiving hole 31a has a first straight portion 31c, an inner end portion 31d, and an outer end portion 31e. When viewed axially, the first straight portion 31c extends in a straight line along the direction in which the first receiving hole 31a extends. The first straight portion 31c is, for example, rectangular when viewed axially. The inner end portion 31d is connected to the radially inner end of the first straight portion 31c. The inner end portion 31d is the radially inner end of the first receiving hole 31a. The outer end portion 31e is connected to the radially outer end of the first straight portion 31c. The outer end portion 31e is the radially outer end of the first receiving hole 31a. The outer end portion 31e extends radially outward from the radially outer end of the first straight portion 31c along the magnetic pole centerline IL1. The first receiving hole 31b has a first straight portion 31f, an inner end portion 31g, and an outer end portion 31h.

[0042] The second receiving hole 32 is located circumferentially between the radially outer ends of the pair of first receiving holes 31a and 31b. That is, in this embodiment, the second receiving hole 32 is located circumferentially between the outer end 31e and the outer end 31h. For example, when viewed axially, the second receiving hole 32 extends in a generally straight line in a direction orthogonal to the radial direction. For example, when viewed axially, the second receiving hole 32 extends in a direction orthogonal to the magnetic pole centerline IL1. The pair of first receiving holes 31a and 31b and the second receiving hole 32 extend, for example, circumferentially between the radially outer ends of the pair of first receiving holes 31a and 31b and the radially outer end 31b. Shape configuration.

[0043] Furthermore, in this specification, the phrase "an object extends in a direction orthogonal to a certain direction" includes not only the case where an object extends in a direction strictly orthogonal to a certain direction, but also the case where an object extends in a direction approximately orthogonal to a certain direction. The phrase "approximately orthogonal to a certain direction" includes, for example, a direction that is inclined within a few degrees [°] relative to a direction strictly orthogonal to a certain direction due to manufacturing tolerances.

[0044] Viewed axially, for example, the magnetic pole centerline IL1 passes through the circumferential center of the second receiving hole 32. That is, the circumferential position of the circumferential center of the second receiving hole 32 coincides, for example, with the circumferential position of the circumferential center of the magnetic pole portion 70. The shape of the second receiving hole 32, viewed axially, is, for example, a line-symmetrical shape centered on the magnetic pole centerline IL1. The second receiving hole 32 is located at the radial outer periphery of the rotor core 20.

[0045] The second receiving hole 32 has a second straight portion 32a, one end 32b, and another end 32c. Viewed axially, the second straight portion 32a extends in a straight line in the direction in which the second receiving hole 32 extends. The second straight portion 32a is, for example, rectangular when viewed axially. One end 32b is connected to the end of the second straight portion 32a on one circumferential side (+θ side). One end 32b is the end of the second receiving hole 32 on one circumferential side. One end 32b is spaced apart from the outer end 31e in the first receiving hole 31a on the other circumferential side (-θ side). The other end 32c is connected to the end of the second straight portion 32a on the other circumferential side (-θ side). The other end 32c is the end of the second receiving hole 32 on the other circumferential side. The other end 32c is spaced apart from the outer end 31h in the first receiving hole 31b on one circumferential side.

[0046] A pair of first magnets 41a and 41b are respectively housed inside a pair of first receiving holes 31a and 31b. First magnet 41a is housed inside the first receiving hole 31a. First magnet 41b is housed inside the first receiving hole 31b. The pair of first magnets 41a and 41b are rectangular, for example, when viewed axially. The pair of first magnets 41a and 41b have the same length in the direction they extend. The first magnets 41a and 41b have the same length in a direction orthogonal to the direction of extension of the pair of first magnets 41a and 41b.

[0047] The first magnets 41a and 41b are, for example, rectangular parallelepipeds. Figure 5 As shown, the axial length of the first magnets 41a and 41b is, for example, slightly smaller than the overall axial length of the first receiving holes 31a and 31b. Figure 3 , Figure 4 As shown, a pair of first magnets 41a and 41b are arranged circumferentially spaced apart from each other. For example, the first magnet 41a is located on one side (+θ side) of the first magnet 41b in the circumferential direction.

[0048] The first magnet 41a extends along the first receiving hole 31a when viewed axially. The first magnet 41b extends along the first receiving hole 31b when viewed axially. For example, when viewed axially, the first magnets 41a and 41b extend in a generally straight line in a direction inclined relative to the radial direction. When viewed axially, the pair of first magnets 41a and 41b extend circumferentially away from each other from the radially inward side toward the radially outward side. That is, the circumferential distance between the first magnets 41a and 41b increases from the radially inward side toward the radially outward side.

[0049] The first magnet 41a is located on one side of the circumference (+θ side), for example, from the radially inward to the radially outward. The first magnet 41b is located on the other side of the circumference (-θ side), for example, from the radially inward to the radially outward. For example, when viewed axially, the first magnets 41a and 41b are arranged circumferentially separated by the magnetic pole centerline IL1. For example, when viewed axially, the first magnets 41a and 41b are arranged linearly symmetrically with respect to the magnetic pole centerline IL1. Hereinafter, for structures identical to the first magnet 41a except for the linear symmetry with respect to the magnetic pole centerline IL1, the description of the first magnet 41b will sometimes be omitted.

[0050] The first magnet 41a is inserted into the first receiving hole 31a. More specifically, the first magnet 41a is inserted into the first straight portion 31c. When viewed axially, the length of the first magnet 41a is, for example, the same as the length of the first straight portion 31c in the direction in which the first straight portion 31c extends.

[0051] Viewed axially, the two ends of the first magnet 41a extending in the direction of extension are respectively separated from the two ends of the first receiving hole 31a extending in the direction of extension. Viewed axially, in the direction of extension of the first magnet 41a, the inner end portion 31d and the outer end portion 31e are respectively arranged adjacent to each other on both sides of the first magnet 41a. Here, in this embodiment, the inner end portion 31d constitutes the first magnetic flux blocking portion 51a. The outer end portion 31e constitutes the first magnetic flux blocking portion 51b. That is, the rotor core 20 has a pair of first magnetic flux blocking portions 51a and 51b, which are arranged across the first magnet 41a in the direction of extension of the first magnet 41a when viewed axially. The rotor core 20 has a pair of first magnetic flux blocking portions 51c and 51d, which are arranged across the first magnet 41b in the direction of extension of the first magnet 41b when viewed axially.

[0052] The first magnetic flux blocking portion 51b, located radially outward, extends radially outward from the radial end of the first magnet 41a, parallel to the magnetic pole center line IL1. The first magnetic flux blocking portion 51d, located radially outward, extends radially outward from the radial end of the first magnet 41b, parallel to the magnetic pole center line IL1.

[0053] Thus, the rotor core 20 has first flux blocking portions 51a, 51b, 51c, and 51d. When viewed axially, each pair of these first flux blocking portions 51a, 51b, 51c, and 51d is arranged at intervals between each of the first magnets 41a and 41b in the direction in which they extend. The first flux blocking portions 51a, 51b, 51c, and 51d, and the second flux blocking portions 52a and 52b (described later), are portions capable of suppressing the flow of magnetic flux. That is, magnetic flux has difficulty passing through each flux blocking portion. Each flux blocking portion is not particularly limited as long as it can suppress the flow of magnetic flux; it may include gaps or non-magnetic portions such as resin portions.

[0054] The second magnet 42 is housed inside the second receiving hole 32. The second magnet 42 is positioned radially outward from the radially inner ends of the pair of first magnets 41a and 41b in a circumferential position between them. Viewed axially, the second magnet 42 extends along the second receiving hole 32. Viewed axially, the second magnet 42 extends in a direction orthogonal to the radial direction. For example, viewed axially, the pair of first magnets 41a and 41b and the second magnet 42 extend along... Shape configuration.

[0055] Furthermore, in this specification, the phrase "the second magnet is positioned circumferentially between a pair of first magnets" is used as long as the circumferential position of the second magnet is included in the circumferential position between the pair of first magnets; the radial position of the second magnet relative to the first magnet is not particularly limited.

[0056] The shape of the second magnet 42, viewed axially, is, for example, linearly symmetrical with respect to the magnetic pole centerline IL1. The second magnet 42 is, for example, rectangular when viewed axially. Viewed axially, the radial length of the second magnet 42 is shorter than the length of the first magnets 41a and 41b in the direction orthogonal to their extension. By making the radial length of the second magnet 42 shorter and thinner than the length of the first magnets 41a and 41b in the direction orthogonal to their extension, the weight of the second magnet 42 can be reduced compared to the weight of each of the first magnets 41a and 41b. By reducing the weight of the second magnet 42, the centrifugal force on the second magnet 42 during rotor 10 rotation can be reduced. Therefore, the load on the rotor core 20 can be reduced.

[0057] By thinning the second magnet 42, it can be positioned radially outward of the rotor core 20. Positioning the second magnet 42 radially outward of the rotor core 20 enables high output of the rotary motor 1. Since the magnetization of the second magnet 42 is enhanced by the first magnets 41a and 41b, high strength of the rotor core 20 and high output of the rotary motor 1 can be achieved without compromising demagnetizing resistance. Furthermore, high demagnetizing resistance can be obtained with a small amount of magnets.

[0058] The second magnet 42 is, for example, rectangular. This enables high output from the rotary motor 1. The axial length of the second magnet 42 is, for example, slightly smaller than the overall axial length of the second receiving hole 32. Figure 3 , Figure 4 As shown, the radially inner portion of the second magnet 42 is located, for example, between the radially outer ends of the pair of first magnets 41a and 41b in the circumferential direction. The radially outer portion of the second magnet 42 is located, for example, at a position radially outer than the pair of first magnets 41a and 41b.

[0059] The second magnet 42 is inserted into the second receiving hole 32. More specifically, the second magnet 42 is inserted into the second straight portion 32a. When viewed axially, the length of the second magnet 42 is, for example, the same as the length of the second straight portion 32a in the direction in which the second straight portion 32a extends.

[0060] Viewed axially, the two ends of the second magnet 42 extending in the direction of extension are respectively disposed separately from the two ends of the second receiving hole 32 extending in the direction of extension. Viewed axially, in the direction of extension of the second magnet 42, one end 32b and the other end 32c are respectively disposed adjacent to each other on both sides of the second magnet 42. Here, in this embodiment, one end 32b constitutes a second magnetic flux blocking portion 52a. The other end 32c constitutes a second magnetic flux blocking portion 52b. That is, the rotor core 20 has a pair of second magnetic flux blocking portions 52a and 52b, which, viewed axially, are disposed across the second magnet 42 in the direction of extension of the second magnet 42.

[0061] The second flux blocking portions 52a and 52b are arc-shaped, extending radially inward from the circumferential end of the second magnet 42 towards a side circumferentially away from the second magnet 42. When the second flux blocking portions 52a and 52b extend radially outward, the distance between them and the outer circumferential surface of the rotor core 20 decreases, potentially increasing the load on the rotor core 20 due to centrifugal force during rotation. By extending the second flux blocking portions 52a and 52b radially inward, the load on the rotor core 20 can be reduced. Furthermore, by making the second flux blocking portions 52a and 52b arc-shaped, stress concentration at the intersection of the circumferentially extending portion and the radially extending portion can be mitigated, further reducing the load on the rotor core 20.

[0062] A pair of second flux blocking portions 52a, 52b and a second magnet 42 are located circumferentially between the first flux blocking portion 51b located radially outward of the pair of first flux blocking portions 51a, 51b separated from the first magnet 41a and the first flux blocking portion 51d located radially outward of the pair of first flux blocking portions 51c, 51d separated from the first magnet 41b.

[0063] The magnetic poles of the first magnet 41a are arranged in a direction orthogonal to the direction in which the first magnet 41a extends when viewed axially. The magnetic poles of the first magnet 41b are arranged in a direction orthogonal to the direction in which the first magnet 41b extends when viewed axially. The magnetic poles of the second magnet 42 are arranged radially.

[0064] The radially outer magnetic poles of the first magnet 41a, the first magnet 41b, and the second magnet 42 are identical. The radially inner magnetic poles of the first magnet 41a, the first magnet 41b, and the second magnet 42 are identical.

[0065] like Figure 3 As shown, in the magnetic pole section 70N, the radially outer poles of the first magnet 41a, the radially outer poles of the first magnet 41b, and the radially outer poles of the second magnet 42 are, for example, N poles. In the magnetic pole section 70N, the radially inner poles of the first magnet 41a, the radially inner poles of the first magnet 41b, and the radially inner poles of the second magnet 42 are, for example, S poles.

[0066] Although the illustration is omitted, in the magnetic pole section 70S, the magnetic poles of each magnet 40 are arranged in reverse order relative to the magnetic pole section 70N. That is, in the magnetic pole section 70S, the radially outer magnetic pole of the first magnet 41a, the radially outer magnetic pole of the first magnet 41b, and the radially outer magnetic pole of the second magnet 42 are, for example, S poles. In the magnetic pole section 70S, the radially inner magnetic pole of the first magnet 41a, the radially inner magnetic pole of the first magnet 41b, and the radially inner magnetic pole of the second magnet 42 are, for example, N poles.

[0067] like Figure 6 As shown, the rotor core 20 has a first recess 80, a first riveting portion 82, and a first protrusion 84.

[0068] like Figure 3 , Figure 4 As shown, the first recesses 80 are respectively provided corresponding to the receiving holes 30 (first receiving holes 31a, 31b, and second receiving holes 32). In this embodiment, the first recesses 80 are arranged radially inwardly adjacent to each of the receiving holes 30 (first receiving holes 31a, 31b, and second receiving holes 32). For example, two first recesses 80a corresponding to the first receiving hole 31a are provided radially inwardly at intervals along the direction of extension of the first straight portion 31c of the first receiving hole 31a. For example, two first recesses 80b corresponding to the first receiving hole 31b are provided radially inwardly at intervals along the direction of extension of the first straight portion 31f of the first receiving hole 31b. For example, two first recesses 80c adjacent to the second receiving hole 32 are provided radially inwardly at intervals along the direction of extension of the second straight portion 32a of the second receiving hole 32.

[0069] like Figure 6 As shown, each first recess 80 is recessed from one side of the first core end face 20a in the axial direction of the rotor core 20 toward the other side. The plurality of electromagnetic plates 25 include one or more first electromagnetic plates 25P located on one side of the axial direction, and second electromagnetic plates 25Q located on the other side of the axial direction relative to the first electromagnetic plates 25P. Each first recess 80 is formed by a cutout 81 provided on one or more first electromagnetic plates 25P located on one side of the axial direction. In this embodiment, each first recess 80 is formed by a cutout 81 provided on, for example, two first electromagnetic plates 25P located on the farthest side in the axial direction. The cutout 81 is provided in a manner that communicates with the receiving hole 30. In this embodiment, the cutout 81 is, for example, U-shaped when viewed from the axial direction.

[0070] The bottom surface 81d of the first recess 80 is formed by a second electromagnetic steel plate 25Q, which is exposed inside the first recess 80 and disposed on the opposite side of the first electromagnetic steel plate 25P in the axial direction. The bottom surface 81d of the first recess 80 is disposed at the same position in the axial direction as the magnet end face 40f on one side of the axial direction of the magnet 40, or disposed on the opposite side further in the axial direction than the magnet end face 40f. In this embodiment, the bottom surface 81d of the first recess 80 is disposed on the opposite side further in the axial direction than the magnet end face 40f. The magnet end face 40f is disposed on the opposite side further in the axial direction than the first iron core end face 20a. That is, the magnet end face 40f is disposed in a position that is recessed further in the axial direction than the first iron core end face 20a. The magnet end face 40g on the opposite side of the axial direction of the magnet 40 is disposed at approximately the same position in the axial direction as the second iron core end face 20b on the opposite side of the axial direction of the rotor iron core 20. Figure 7 As shown, when assembling the rotor core 20, with the second core end face 20b of the rotor core 20 abutting against the assembly work surface F, the magnet 40 is inserted into each receiving hole 30 until the magnet end face 40g on the other side of the axial direction abuts against the second core end face 20b, thereby achieving the above assembly.

[0071] like Figure 6 As shown, the first riveting portion 82 is disposed on the bottom surface 81d of the first recess 80. Figure 7 As shown, the first riveting part 82 is provided by riveting the second electromagnetic steel plate 25Q exposed inside the first recess 80 using a tool T such as a punch. Figure 6 As shown, the first riveting part 82 is a recess created by riveting the second electromagnetic steel plate 25Q using a tool T.

[0072] The first protrusion 84 is provided as follows: the second electromagnetic steel plate 25Q is riveted to the inside of the first recess 80 using a tool T, thereby causing the second electromagnetic steel plate 25Q to protrude toward the magnet 40 in a direction intersecting the inner periphery and axial direction of the receiving hole 30. The first protrusion 84 abuts against the side surface 40s of the magnet 40. By abutting against the side surface 40s of the magnet 40, the radially outward side surface 40t of the magnet 40 is pressed against the inner peripheral surface of each receiving hole 30.

[0073] like Figure 6 As shown, each magnet 40 (first magnet 41a, 41b, second magnet 42) abuts against the radially inward side 40s of the magnet 40 through the first protrusion 84, and the radially outward side 40t abuts against the inner circumferential surface of the receiving hole 30 (first receiving hole 31a, 31b, second receiving hole 32), thereby fixing it to the rotor core 20.

[0074] According to the above structure, by providing a first riveting portion 82 on the bottom surface 81d of the first recess 80 that is recessed from the first core end face 20a of the rotor core 20 towards the other side axially, the first protrusion 84 abuts against the side surface 40s of the magnet 40. Thus, the magnet 40 is reliably fixed to the rotor core 20. Furthermore, since the first protrusion 84 abuts against the side surface 40s of the magnet 40, damage to the magnet 40 can be suppressed. Therefore, damage to the magnet 40 can be suppressed, and it can be reliably fixed to the rotor core 20.

[0075] According to the above structure, the bottom surface 81d of the first recess 80 is disposed at the same position in the axial direction as the magnet end face 40f on one side of the magnet 40, or disposed on the other side in the axial direction, so that the first protrusion 84 reliably abuts against the side surface 40s of the magnet 40.

[0076] According to the above structure, the first recess 80 can be easily provided by providing a cutout 81 in the first electromagnetic steel plate 25P. In addition, since the bottom surface 81d of the first recess 80 is formed by the second electromagnetic steel plate 25Q, the first protrusion 84 can be provided by making the second electromagnetic steel plate 25Q protrude toward the magnet 40 in a direction intersecting the axial direction.

[0077] According to the above structure, even if the magnet end face 40f does not protrude to the side further axially than the first iron core end face 20a, but is located on the side further axially than the first iron core end face 20a, the magnet 40 can be reliably fixed to the rotor iron core 20 by abutting the first protrusion 84 against the side surface 40s of the magnet 40.

[0078] According to the above structure, by positioning the first protrusion 84 radially inward relative to the magnet 40, the magnet 40 can be positioned radially outward of the rotor core 20. This enables high output of the rotary motor 1.

[0079] Based on the above structure, the cutout 81 and the storage hole 30 are connected, making it easy to process the cutout 81 and the storage hole 30 as an opening on the laminated steel plate.

[0080] The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to these examples. The various shapes and combinations of the constituent components shown in the above examples are merely examples, and various modifications can be made according to design requirements, etc., without departing from the spirit of the present invention.

[0081] For example, such as Figure 8As shown, the rotor core may also have: a second riveting portion 92, which is formed on the second core end face 20b on the other side of the axial direction; and a second protrusion 94, which protrudes toward the magnet 40 in the direction that intersects the inner periphery of the receiving hole 30 with the axial direction, and abuts against the side surface 40s of the magnet 40.

[0082] According to the above structure, in addition to the first protrusion 84, by providing a second riveting part 92 and a second protrusion 94 on the second core end face 20b side on the other side of the axial direction of the rotor core 20, the magnet 40 can be firmly fixed on one side and the other side of the axial direction.

[0083] In the above embodiment, two first recesses 80 are provided opposite each receiving hole 30, but their number is not limited. Alternatively, one first recess 80 may be provided opposite each receiving hole 30, or three or more may be provided opposite each receiving hole 30.

[0084] Furthermore, the first recess 80 is disposed radially inner relative to each receiving hole 30, but is not limited thereto. The first recess 80 may be disposed radially outer relative to each receiving hole 30, or it may be disposed on both radially inner and radially outer sides of each receiving hole 30.

[0085] Furthermore, the first recess 80 is formed by a cutout 81 provided on the first electromagnetic steel plate 25P facing the receiving hole 30, but is not limited thereto. The first recess 80 may also be formed by a hole provided at a position away from the receiving hole 30.

[0086] The rotary electric motor using this invention is not limited to a motor, but can also be a generator. In this case, the rotary electric motor can also be a three-phase AC generator. The application of the rotary electric motor is not particularly limited. For example, the rotary electric motor can be mounted on a vehicle, or on equipment other than a vehicle. The number of poles and slots of the rotary electric motor is not particularly limited. In the rotary electric motor, the coils can be constructed using any winding method. The structures described above can be appropriately combined within a range that does not contradict each other.

Claims

1. A rotary electric motor, characterized in that, have: A rotor that can rotate about a central axis; and The stator is located radially outside the rotor. The rotor described above has: The rotor core has multiple electromagnetic steel plates stacked axially and has multiple receiving holes; and Multiple magnets are respectively housed inside the aforementioned multiple storage holes. The above-mentioned rotor core has the following characteristics: The first recess is recessed from the first iron core end face on one side of the axial direction to the other side of the axial direction. The first riveting part is provided on the bottom surface of the first recess; as well as The first protrusion protrudes toward the magnet in a direction that intersects the inner periphery of the aforementioned receiving hole with the axial direction, and abuts against the side of the magnet in a state where the axial end face of the magnet is open. The magnet end face on one side of the axial direction of the aforementioned magnet is positioned on the opposite side of the axial direction, which is further away from the end face of the first iron core. The first recess is formed by a cut that communicates with the receiving hole.

2. The rotary motor according to claim 1, characterized in that, The bottom surface of the first recess is positioned at the same axial position as the magnet end face on one side of the axial direction of the magnet, or it is positioned on the other side of the axial direction, which is closer to the magnet end face than the magnet end face.

3. The rotary motor according to claim 1 or 2, characterized in that, The aforementioned plurality of electromagnetic steel plates include: one or more first electromagnetic steel plates located on one side of the axial direction; and a second electromagnetic steel plate located on the other side of the axial direction relative to the first electromagnetic steel plate. The aforementioned first recess is formed by a hole or cut in the aforementioned first electromagnetic steel plate. The bottom surface of the first recess is exposed inside the first recess and is made of the second electromagnetic steel plate.

4. The rotary motor according to claim 1 or 2, characterized in that, The aforementioned first protrusion is disposed on the radially inner side of the magnet, intersecting the axial direction.

5. The rotary motor according to claim 1 or 2, characterized in that, The above-mentioned rotor core has the following characteristics: The second riveting part, which is located on the second core end face on the opposite side of the axial direction; and The second protrusion protrudes toward the magnet in a direction that intersects the inner periphery of the aforementioned receiving hole with the axial direction, and abuts against the side of the aforementioned magnet.

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