WO2024034218A1 - Rotor, motor equipped with same, and rotor manufacturing method - Google Patents

Abstract

This rotor comprises: a columnar rotor core having a plurality of core sheets and a magnet insertion hole; and a magnet inserted into the magnet insertion hole. The plurality of core sheets have first core sheets and second core sheets that are laminated adjacent to the first core sheets in a magnet insertion direction and have an insertion portion constituting part of the magnet insertion hole. The first core sheets constitute part of the inner surface of the magnet insertion hole and have a projection portion that projects toward the inside of the insertion portion when viewing the rotor from the axial direction and makes contact with the magnet. The rotor has: a housing portion that is positioned, in the first core sheets or the second core sheets, in a direction opposite to the projection direction of the projection portion with respect to the projection portion when viewing the rotor from the axial direction; and a restriction member that is housed in the housing portion at a position in the opposite direction to the projection portion and restricts the displacement of the projection portion in the opposite direction.

Description

Rotor, motor equipped with the same, and method for manufacturing the rotor

The present invention relates to a rotor, a motor equipped with the same, and a method for manufacturing the rotor.

In a rotor for a motor in which a magnet is inserted into a magnet insertion hole, a part of the inner surface of the magnet insertion hole pushes the magnet inwardly, so that the magnet is pushed inside the magnet insertion hole. A configuration that maintains this is known. For example, in Japanese Publication No. 2013-126330, a plurality of core plates in which insertion holes are formed are laminated, a permanent magnet is inserted into the insertion holes, and a permanent magnet is inserted between the outer peripheral part of the core plate and the inside of the insertion hole. A core of a rotating electrical machine is disclosed in which a bridge portion between the core and the edge is deformed toward the permanent magnet, and the bridge portion presses the permanent magnet.

Japanese Publication No. 2013-126330

As described above, in the structure in which the protrusion protruding from the inner surface of the magnet insertion hole pushes the magnet to hold the magnet in the magnet insertion hole, when magnetizing the magnet inserted into the magnet insertion hole, , the magnetic flux may generate a force on the magnet that pushes the protrusion. When the protrusion is movable within the magnet insertion hole, when the magnet is magnetized as described above, the magnet pushes the protrusion, so that the protrusion or the part that supports the protrusion is moved. May undergo plastic deformation. In this case, the force with which the protrusion holds the magnet in the magnet insertion hole may be reduced.

Therefore, in a rotor that holds the magnet by the protrusion within the magnet insertion hole, there is a need for a configuration that can suppress a decrease in the holding force of the magnet.

An object of the present invention is to realize a configuration in which a decrease in the holding force of the magnet can be suppressed in a rotor that uses a protrusion to hold a magnet inserted into a magnet insertion hole.

A rotor according to an embodiment of the present invention includes a columnar rotor core having a plurality of core plates stacked in the thickness direction, a magnet insertion hole extending in the axial direction, and a magnet inserted into the magnet insertion hole. , is provided. The plurality of core plates include a first core plate and a second core plate that is stacked adjacent to the first core plate in the magnet insertion direction of the magnet and has an insertion portion that forms a part of the magnet insertion hole. It has a core plate. The first core plate constitutes a part of the inner surface of the magnet insertion hole, and has a protrusion that protrudes inward of the insertion portion and comes into contact with the magnet when the rotor is viewed from the axial direction. The rotor includes, in the first core plate or the second core plate, an accommodating portion located in a direction opposite to a protruding direction of the protruding portion with respect to the protruding portion when the rotor is viewed from the axial direction; a limiting member that is housed in the portion at a position in the opposite direction with respect to the protrusion and limits displacement of the protrusion in the opposite direction.

A motor according to an embodiment of the present invention includes a rotor having the above configuration, and a stator having a stator coil and a stator core.

A method for manufacturing a rotor according to an embodiment of the present invention includes a cylindrical rotor core having a plurality of core plates laminated in the thickness direction, a magnet insertion hole extending in the axial direction, and a rotor core inserted into the magnet insertion hole. A method of manufacturing a magnet and a rotor provided therein. forming a first core plate and a second core plate that is laminated adjacent to the first core plate in the magnet insertion direction of the magnet and has an insertion portion that constitutes a part of the magnet insertion hole; , in the first core plate, forming a part of the inner surface of the magnet insertion hole, and forming a protrusion that protrudes inward of the insertion portion and contacts the magnet when the rotor is viewed from the axial direction; , in the first core plate or the second core plate, the rotor is located in a direction opposite to the protrusion direction of the protrusion with respect to the protrusion when viewed from the axial direction, and the protrusion is in the opposite direction a core plate forming step of forming a displacement allowing portion that allows displacement to the core plate, and laminating the plurality of core plates including the first core plate and the second core plate in the thickness direction, so that the A core plate laminating step for obtaining the columnar rotor core having a magnet insertion hole, a magnet insertion step for inserting the magnet into the magnet insertion hole of the rotor core, and after the magnet insertion step, the first core plate or the first In the two-core plate, a limiting member accommodating step of accommodating a limiting member that limits displacement of the protruding portion in the opposite direction in the displacement allowing portion; and after the limiting member accommodating step, the limiting member is inserted into the magnet insertion hole. and a magnetizing step of magnetizing the magnet.

According to an embodiment of the present invention, in a rotor that holds a magnet inserted into a magnet insertion hole by a protrusion, a configuration is realized in which a decrease in the holding force of the magnet can be suppressed.

FIG. 1 is a diagram showing an example of a motor according to a first embodiment. FIG. 2 is a diagram showing an example of a rotor according to the first embodiment. FIG. 3 is a diagram showing an example of a rotor according to the first embodiment. FIG. 4 is a cross-sectional view taken along the line IV--IV in FIG. FIG. 5 is a diagram showing an example of the first core plate according to the first embodiment. FIG. 6 is a diagram showing an example of the second core plate according to the first embodiment. FIG. 7 is a diagram illustrating an example of a method for manufacturing a rotor according to the first embodiment. FIG. 8 is a diagram showing an example of magnet insertion into the rotor core according to the first embodiment. FIG. 9 is a diagram showing an example of magnet insertion into the rotor core according to the first embodiment. FIG. 10 is a diagram illustrating an example of insertion of the limiting member according to the first embodiment. FIG. 11 is a diagram showing an example of a rotor according to the second embodiment. FIG. 12 is a diagram showing an example of a rotor according to the second embodiment. FIG. 13 is a sectional view taken along the line XIII-XIII in FIG. 12. FIG. 14 is a diagram showing an example of a reference core plate according to the second embodiment. FIG. 15 is a diagram showing an example of the first core plate according to the second embodiment. FIG. 16 is a diagram showing an example of the second core plate according to the second embodiment. FIG. 17 is a diagram illustrating an example of a method for manufacturing a rotor according to the second embodiment. FIG. 18 is a diagram showing an example of a rotor according to the third embodiment. FIG. 19 is a diagram illustrating an example of a method for manufacturing a rotor according to the third embodiment.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. Note that the same or corresponding parts in the figures are given the same reference numerals, and the description thereof will not be repeated. Further, the dimensions of the constituent members in each figure do not faithfully represent the actual dimensions of the constituent members or the dimensional ratios of each constituent member.

In the following description of the motor 100, the direction parallel to the central axis P of the rotors 10, 10A, 10B will be referred to as the "axial direction", the direction perpendicular to the central axis P will be referred to as the "radial direction", and the direction around the central axis P will be referred to as the "radial direction". The direction along the circular arc is called the "circumferential direction". Note that although the thickness direction of the core plate 3 and the lamination direction of the core plate 3 may be described below, the thickness direction and the lamination direction are parallel to the axial direction. However, these definitions are not intended to limit the orientation of the rotors 10, 10A, 10B during manufacture and use.

In addition, in the following description, "the same" includes not only the exact same case, but also the range that can be considered to be substantially the same. That is, it is sufficient that they are the same to the extent that the effects of the invention are achieved.

In addition, in the following explanation, expressions such as "fixing", "connecting", and "attaching" (hereinafter referred to as "fixing, etc.") are used not only when members are directly fixed to each other, but also when they are connected through other members. Including cases where it is fixed. That is, in the following description, expressions such as fixation include direct and indirect fixation of members.

(Embodiment 1)
(motor)
An example of the motor 100 according to the first embodiment will be described using FIG. 1. Motor 100 is an IPM motor.

As shown in FIG. 1, the motor 100 includes a rotor 10, a stator 102, a housing 103, and a shaft 104. The rotor 10 rotates about a central axis P with respect to the stator 102. In the present embodiment, the motor 100 is a so-called inner rotor type motor in which a rotor 10 is rotatably located within a cylindrical stator 102 around a central axis P.

The rotor 10 includes a rotor core 1 and magnets 2. The rotor 10 is located radially inward of the stator 102 and is rotatable relative to the stator 102 about the central axis P.

The stator 102 is housed within the housing 103. In this embodiment, stator 102 is cylindrical. The rotor 10 is located inside the stator 102 in the radial direction. That is, the stator 102 is located radially opposite to the rotor 10.

The stator 102 includes a stator core 105 and a stator coil 106. Stator coil 106 is wound around stator core 105. A detailed explanation of the structure of the stator 102 will be omitted.

(rotor)
As shown in FIG. 2, the rotor 10 has a columnar shape extending along the central axis P. The rotor 10 includes a rotor core 1 and a plurality of magnets 2.

(Rotor core and magnet 2)
As shown in FIG. 2, the rotor core 1 has a shaft insertion hole 1a that extends along the central axis P and passes through it. As shown in FIG. 1, the shaft 104 is fixed while passing through the shaft insertion hole 1a in the axial direction. Thereby, the rotor core 1 rotates together with the shaft 104.

Further, the rotor core 1 has a plurality of core plates 3 and a plurality of magnet insertion holes 4. The plurality of core plates 3 are stacked in the thickness direction of the core plates 3. Each core plate 3 is a disc-shaped electromagnetic steel plate formed into a predetermined shape.

The plurality of magnet insertion holes 4 are located at predetermined intervals in the circumferential direction. The plurality of magnet insertion holes 4 penetrate the rotor core 1 in the axial direction. The plurality of magnet insertion holes 4 have a rectangular shape that is long in one direction when viewed from the axial direction. The plurality of magnet insertion holes 4 include a magnet insertion hole 4 whose longitudinal direction extends along the outer circumference of the rotor core 1 when viewed from the axial direction, and a magnet insertion hole whose longitudinal direction extends from the radially outer circumferential side to the radially inner circumferential side of the rotor core 1 when viewed from the axial direction. hole 4. The magnet 2 is accommodated in the magnet insertion hole 4 . Note that the plurality of magnet insertion holes 4 may include magnet insertion holes 4 extending in the radial direction of the rotor core 1 when viewed from the axial direction.

The magnet 2 has a rectangular parallelepiped shape and extends in the axial direction. The magnet 2 is inserted into the magnet insertion hole 4 and housed in the magnet insertion hole 4 along a magnet insertion direction, which is a direction in which the magnet 2 is inserted from one axial direction of the rotor 10 . The magnet 2 is fixed to the magnet insertion hole 4 by a holding portion 53 of the first core plate 5, which will be described later.

FIG. 3 is a diagram of the rotor 10 and the first core plate 5 viewed from the axial direction. FIG. 4 is a cross-sectional view taken along the line IV--IV in FIG. As shown in FIG. 4, the plurality of stacked core plates 3 include a plurality of first core plates 5 and a plurality of second core plates 6.

As shown in FIG. 4, a plurality of first core plates 5 are successively stacked. One of the plurality of first core plates 5 is located at an end surface of the rotor 10 in the axial direction. Note that each of the first core plates 5 has a similar configuration.

Furthermore, as shown in FIG. 4, a plurality of second core plates 6 are successively stacked. Further, the plurality of second core plates 6 are located on the magnet insertion direction side with respect to the plurality of first core plates 5. Note that each of the second core plates 6 has a similar configuration. Note that the magnet insertion direction is the direction in which the magnet 2 is inserted into the magnet insertion hole 4. The magnet insertion direction side means the front side in the magnet insertion direction.

(1st core plate)
An example of the first core plate 5 according to the first embodiment will be described using FIGS. 3 to 5. As shown in FIG. 3, the first core plate 5 includes a plurality of first insertion portions 51, a plurality of accommodating portions 52, and a plurality of holding portions 53.

Specifically, the first core plate 5 of this embodiment has two accommodating parts 52 and two holding parts 53 for one first insertion part 51. In addition, the structure of the several 1st insertion part 51 which the 1st core board 5 has is the same. Moreover, the configurations of the accommodating part 52 and the holding part 53 for each first insertion part 51 are the same. Therefore, in the following, one first insertion section 51, one accommodation section 52 for the first insertion section 51, and one holding section 53 located between the first insertion section 51 and the accommodation section 52 will be described. I will explain about it.

The first insertion portion 51 is a through hole that penetrates the first core plate 5 in the thickness direction. The magnet 2 is located within the first insertion portion 51 . In this way, the first insertion portion 51 constitutes a part of the magnet insertion hole 4. As shown in FIG. 5, the first insertion portion 51 has a long shape in one direction when the first core plate 5 is viewed from the axial direction. Here, the first insertion portion 51 has a long shape in one direction perpendicular to the radial direction when the first core plate 5 is viewed from the axial direction. Note that FIG. 5 is an enlarged view of the broken line portion in FIG.

The housing portion 52 is a through hole that penetrates the first core plate 5 in the thickness direction. Further, when the first core plate 5 is viewed from the axial direction, the accommodating portion 52 has a rectangular shape and is elongated in one direction perpendicular to the radial direction.

The accommodating portion 52 is located in the opposite direction of the protruding direction of the protruding portion 54 with respect to the first insertion portion 51 and the protruding portion 54 described below. For example, the protruding direction is radially outward. At this time, the opposite direction is radially inward.

Specifically, as shown in FIG. 5, the accommodating portion 52 has an inner surface 51a that constitutes one of a pair of inner surfaces extending in the longitudinal direction of the first insertion portion 51 when the first core plate 5 is viewed from the axial direction. On the other hand, it is located on the opposite direction side. That is, here, the accommodating part 52 is located radially inward with respect to the first insertion part 51.

The holding portion 53 is a portion of the first core plate 5 that holds the magnet 2 inserted into the magnet insertion hole 4. The holding part 53 is located between the first insertion part 51 and the accommodating part 52. Therefore, the accommodating part 52 is located on the opposite side of the magnet 2 with respect to the holding part 53.

As shown in FIG. 5, the holding portion 53 constitutes a part of the inner surface 51a. Furthermore, the holding portion 53 has a protrusion 54 on the magnet 2 side. That is, the holding part 53 of the first core plate 5 is located on the inner surface 51a of the first insertion part 51, and is located inside the first insertion part 51 and the second insertion part 61, which will be described later, when the rotor 10 is viewed from the axial direction. The magnet 2 has a protrusion 54 that protrudes and comes into contact with the magnet 2. The protrusion 54, which is a part of the holding part 53, constitutes a part of the inner surface of the magnet insertion hole 4. The protruding portion 54 protrudes on the opposite side from the accommodating portion 52. For example, the protrusion 54 protrudes radially outward. Note that the protrusion direction of the protrusion 54 is not limited to the radially outward direction.

Note that, as shown in FIG. 4, the first insertion portions 51 of the plurality of first core plates 5 are arranged in the axial direction. The first insertion portion 51 of the plurality of first core plates 5 stacked together constitutes a part of the magnet insertion hole 4 .

Further, as shown in FIG. 4, each of the plurality of first core plates 5 has a housing portion 52. A plurality of accommodating portions 52 are arranged in the axial direction. That is, the housing portion 52 of the first core plate 5 on one side in the axial direction is connected to the housing portion 52 of the first core plate 5 on the other side in the axial direction.

Furthermore, as shown in FIG. 4, the plurality of holding parts 53 are arranged in the axial direction. That is, the holding part 53 of the first core plate 5 on one axial side and the holding part 53 of the first core plate 5 on the other axial side overlap when the first core plate 5 is viewed from the axial direction. Furthermore, the plurality of protrusions 54 are arranged in the axial direction.

(Second core plate)
An example of the second core plate 6 according to the first embodiment will be described using FIG. 6. FIG. 6 is an axial view of the second core plate 6 laminated on the rotor core 1.

As shown in FIG. 4, the second core plate 6 is laminated adjacent to the first core plate 5 in the magnet insertion direction of the magnet 2. Further, the second core plate 6 has a second insertion portion 61 that constitutes a part of the magnet insertion hole 4 . Specifically, as shown in FIG. 6, the second core plate 6 has a second insertion part 61 and a covering part 62.

The second insertion portion 61 is a through hole that penetrates the second core plate 6 in the thickness direction. The first insertion portion 51 of the first core plate 5 and the second insertion portion 61 of the second core plate 6 are aligned in the axial direction. That is, the first insertion portion 51 of the first core plate 5 and the second insertion portion 61 of the second core plate 6 overlap when the rotor 10 is viewed from the axial direction. In this way, the second insertion portion 61 constitutes a part of the magnet insertion hole 4 of the rotor core 1.

The covering portion 62 overlaps with the accommodating portion 52 of the first core plate 5 when the rotor 10 is viewed from the axial direction. Therefore, the second core plate 6 stacked adjacent to the first core plate 5 covers the housing portion 52 in the axial direction.

(Accommodation section and restriction member)

The plurality of core plates 3 have a plurality of first core plates 5. Each of the plurality of first core plates 5 has a housing portion 52.

The accommodating portion 52 is a through hole that is located in a direction opposite to the protruding direction of the protruding portion 54 of the first core plate 5 and that penetrates each of the plurality of first core plates 5 in the thickness direction. Moreover, the accommodating portion 52 is open at the end surface of the rotor core 1 in the axial direction. Note that the accommodating portion 52 may be connected to a part of the first insertion portion 51 of the first core plate 5. That is, the accommodating portion 52 may be a part of the first insertion portion 51 of the first core plate 5.

As shown in FIG. 4, the rotor 10 has a limiting member 7. The restricting member 7 is housed in the accommodating portion 52 at a position opposite to the protruding portion 54, and limits displacement of the holding portion 53 and the protruding portion 54 in the opposite direction. In this embodiment, the limiting member 7 is a bar inserted into the housing portion 52. Note that the limiting member 7 may be a resin that has fluidity in an initial state and can be hardened after injection.

When the rotor 10 is viewed from the axial direction, the limiting member 7 has a rectangular shape, for example. As shown in FIG. 4, the limiting member 7 is in contact with the inner surface of the housing portion 52. As shown in FIG.

Note that, as shown in FIG. 4, the length of the limiting member 7 in the axial direction is the same as the thickness of the plurality of first core plates 5 in the axial direction. However, the length of the limiting member 7 in the axial direction may be different from the thickness of the plurality of first core plates 5 in the axial direction.

(Method for manufacturing rotor 10)
An example of a method for manufacturing the rotor 10 according to the first embodiment will be described with reference to FIGS. 7 to 10. As shown in FIG. 7, the method for manufacturing the rotor 10 includes a core plate forming step S1, a core plate laminating step S2, a magnet inserting step S3, a limiting member housing step S4, and a magnetizing step S5.

The core plate forming step S1 is a step of forming the first core plate 5 and the second core plate 6. In the core plate forming step S1, a plurality of first insertion parts 51 forming part of the magnet insertion hole 4, a housing part 52 located radially inward with respect to the first insertion part 51, and a first insertion part A first core plate 5 having a holding part 53 located between the first core plate 51 and the housing part 52 is formed.

The first core plate 5 also includes a protrusion that forms part of the inner surface of the magnet insertion hole 4 and that protrudes inward of the first insertion portion 51 and comes into contact with the magnet 2 when the rotor 10 is viewed from the axial direction. 54 is formed.

Further, in the core plate forming step S1, a second core is laminated adjacent to the first core plate 5 in the magnet insertion direction of the magnet 2, and has a second insertion part 61 forming a part of the magnet insertion hole 4. A plate 6 is formed.

Here, the accommodation portion 52 of the first core plate 5 is a through hole, and is a space before the restriction member 7 is accommodated. Therefore, when the holding part 53 and the protruding part 54 are pushed in the opposite direction while the accommodating part 52 does not accommodate the limiting member 7, the holding part 53 deforms in the opposite direction. That is, when the accommodating part 52 does not accommodate the limiting member 7, the accommodating part 52 is a displacement allowing part that allows the holding part 53 and the protruding part 54 to be displaced in the opposite direction. Therefore, in the core plate forming step, a displacement allowing portion is provided on the first core plate 5, which is located in a direction opposite to the protrusion direction of the protrusion 54 with respect to the protrusion 54, and allows displacement of the protrusion 54 in the opposite direction. It is also the process of forming.

The core plate lamination process S2 is a process of laminating a plurality of core plates 3 including the first core plate 5 and the second core plate 6 in a predetermined order in the thickness direction. Specifically, the plurality of second core plates 6 are stacked adjacent to the plurality of first core plates 5 in the magnet insertion direction. By completing the core plate lamination step S2, a columnar rotor core 1 having a magnet insertion hole 4 extending in the axial direction is obtained.

The magnet insertion step S3 is a step of inserting the magnet 2 into the magnet insertion hole 4. An example of the magnet insertion step S3 will be described with reference to FIGS. 8 and 9. As shown in FIG. 8, when the magnet 2 is not inserted into the magnet insertion hole 4, the holding part 53 and the protrusion part 54 protrude toward the inside of the magnet insertion hole 4.

As shown in FIG. 8, when the magnet 2 is inserted into the magnet insertion hole 4, the tip of the magnet 2 and the protruding part 54 come into contact with each other, so that the holding part 53 and the protruding part 54 are attached to the housing part 52. direction, that is, the opposite direction. That is, the holding portion 53 is deformed inward in the radial direction due to the space of the accommodating portion 52 . As a result, the holding portion 53 and the protruding portion 54 are displaced in the opposite direction. By deforming the holding portion 53 and displacing the protruding portion 54, the magnet 2 can be inserted smoothly.

On the other hand, the holding portion 53 has elastic restoring force. As shown in FIG. 9, due to the elastic restoring force, the protrusion 54 in contact with the magnet 2 pushes the magnet 2 inward of the magnet insertion hole 4, that is, in the direction in which the protrusion 54 protrudes. As a result, the magnet 2 inserted into the magnet insertion hole 4 is pressed against the inner surface of the magnet insertion hole 4 on the opposite side of the holding portion 53 with the magnet 2 interposed therebetween. As a result, the magnet 2 is held in the magnet insertion hole 4.

The limiting member accommodation step S4 is a step of accommodating the limiting member 7 that limits the displacement of the protruding portion 54 in the opposite direction in the accommodating portion 52, that is, the displacement allowing portion. As shown in FIG. 10, after the magnet insertion step S3, the rod-shaped limiting member 7 is inserted into the housing portions 52 of the plurality of first core plates 5 in the axial direction. As shown in FIG. 10, one end of the limiting member 7 in the axial direction is thinner than the other end.

In the limiting member accommodation step S4, axial pressure is applied to the limiting member 7 during insertion. That is, the limiting member 7 is press-fitted into the housing portion 52. Specifically, the restricting member 7 is inserted into the accommodating portion 52 from the narrow end in the axial direction. A portion of the limiting member 7 has a thickness that is greater than or equal to the inner diameter of the accommodating portion 52 in the lateral direction when the first core plate 5 is viewed from the axial direction. FIG. 10 shows a state in which the limiting member 7 is in contact with the inner surface of the accommodating portion 52 during insertion. In this way, the limiting member 7 is press-fitted while the outer surface of the limiting member 7 and the inner surface of the accommodating portion 52 rub against each other.

By press-fitting, the outer surface of the limiting member 7 accommodated in the accommodating portion 52 is pressed against the inner surface of the accommodating portion 52. Thereby, the limiting member 7 is reliably fixed within the housing portion 52.

After the limiting member housing step S4, a magnetizing step S5 is performed. The magnetization step S5 is a step of magnetizing the magnet 2 inserted into the magnet insertion hole 4.

When the magnet 2 inserted into the magnet insertion hole 4 is magnetized, if the accommodating part 52 does not accommodate the limiting member 7, the protruding part 54 can be deformed in the opposite direction due to the space of the accommodating part 52. There is sex. Here, the rotor 10 of the first embodiment includes a limiting member that is housed in the housing portion 52 at a position in the opposite direction relative to the protrusion 54 and limits displacement of the protrusion 54 in the opposite direction. According to this configuration, when the magnet 2 is magnetized, the displacement of the protruding portion 54 in the opposite direction is suppressed compared to a case where the limiting member 7 is not accommodated in the accommodating portion 52. Therefore, when the magnet 2 is magnetized, plastic deformation of the protrusion 54 in the opposite direction can be prevented. Therefore, the rotor 10 is realized which can suppress a decrease in the holding force of the magnet 2 inserted into the magnet insertion hole 4.

Furthermore, in the rotor 10 of the first embodiment, the plurality of core plates 3 include the plurality of first core plates 5. Each of the plurality of first core plates 5 has a housing portion 52. The accommodating portion 52 is a through hole located in the opposite direction to the protruding portion 54 of the first core plate 5 and passing through each of the plurality of first core plates 5 in the thickness direction. The restriction member 7 is located within the through hole. The restriction member 7 located in the accommodating portion 52 suppresses the displacement of the protruding portion 54 in the opposite direction in the plurality of first core plates 5 . Therefore, the magnet 2 inserted into the magnet insertion hole 4 can be held more reliably.

Furthermore, the housing portion 52 is open to the end surface of the rotor core 1 in the axial direction. According to this configuration, the work of filling the accommodating portion 52 with the restricting member 7 can be easily performed.

Further, the restriction member 7 includes a bar inserted into the housing portion 52. According to this configuration, the restricting member 7 can be formed within the accommodating portion 52 by a simple operation of inserting a bar. Thereby, the rotor 10 in which the displacement of the protruding portion 54 of the first core plate 5 is suppressed can be easily manufactured.

In this way, the motor 100 includes the rotor 10 and the stator 102 having the stator coil 106 and stator core 105 according to the first embodiment. According to this configuration, the rotor 10 has the rotor 10 that maintains the holding force of the magnet 2 inserted into the magnet insertion hole 4. Therefore, it is possible to provide a motor that is less likely to fail.

Furthermore, according to the manufacturing method of the present disclosure, since the magnet 2 is inserted into the magnet insertion hole 4 before the limiting member 7 is accommodated in the accommodating portion 52, the protruding portion 54 is moved in the protruding direction more than after the limiting member 7 is accommodated. It is easy to displace in the opposite direction, and the magnet 2 can be smoothly inserted into the magnet insertion hole 4.

Furthermore, since the magnet 2 in the magnet insertion hole 4 is magnetized after the limiting members 7, 7A, and 7B are accommodated in the accommodating portion 52, displacement of the protruding portion 54 in the opposite direction is suppressed. Therefore, it is possible to manufacture the rotor 10 in which the holding force of the magnet 2 inserted into the magnet insertion hole 4 is maintained.

(Embodiment 2)
Next, an example of the rotor 10A according to the second embodiment will be described with reference to FIGS. 11 to 17. The rotor 10A of the second embodiment and the rotor 10 of the first embodiment differ in the configurations of the first core plate and the second core plate, but are otherwise the same. In the following, the same components as those in Embodiment 1 are denoted by the same reference numerals, and the description thereof will be omitted.

FIG. 11 is an axial view of the rotor 10A according to the second embodiment. FIG. 12 is an enlarged view of the portion surrounded by the broken line in FIG. 11. FIG. 13 is a sectional view taken along the line XIII-XIII in FIG. 12.

As shown in FIG. 13, in the rotor core 1A, a plurality of core plates 3 are stacked in the thickness direction. The plurality of core plates 3 include a basic core plate 80, a first core plate 50, and a second core plate 60. The inner surface of the magnet insertion hole 4 of the rotor core 1A is the inner surface of the basic insertion portion 801 of the basic core plate 80, the inner surface of the first insertion portion 501 of the first core plate 50, and the inner surface of the second insertion portion 601 of the second core plate 60. including.

As shown in FIG. 13, the rotor core 1A has a laminated group 31 including a basic core plate 80, a first core plate 50, and a second core plate 60 laminated in a predetermined order. A plurality of lamination groups 31 are laminated in the axial direction.

In this embodiment, the laminated group 31 includes one first core plate 50, one second core plate 60, and a plurality of basic core plates 80. The second core plate 60 is stacked adjacent to the first core plate 50 on one side in the axial direction. A plurality of basic core plates 80 are successively stacked on the other side of the second core plate 60 in the axial direction.

FIG. 14 is an enlarged view of the basic core plate 80 located in the broken line area in FIG. 11 when viewed from the axial direction. FIG. 15 is an enlarged view of the first core plate 50 located in the broken line portion of FIG. 11 when viewed from the axial direction. FIG. 16 is an enlarged view of the second core plate 60 located at the broken line portion in FIG. 11 when viewed from the axial direction. In addition, in FIGS. 14 to 16, broken lines indicate an example of the position of the magnet 2 inserted into the magnet insertion hole 4.

As shown in FIG. 14, the basic core plate 80 has a basic insertion part 801. The basic insertion portion 801 is a through hole that penetrates the basic core plate 80 in the thickness direction. The basic insertion portion 801 constitutes a part of the magnet insertion hole 4. Here, the basic insertion portion 801 has a long shape in one direction perpendicular to the radial direction when the basic core plate 80 is viewed from the axial direction.

As shown in FIG. 15, the first core plate 50 has a first insertion portion 501. The first insertion portion 501 is a through hole that penetrates the first core plate 50 in the thickness direction. The first insertion portion 501 constitutes a part of the magnet insertion hole 4. Here, the first insertion portion 501 of the first core plate 50 has a long shape in one direction perpendicular to the radial direction when the first core plate 50 is viewed from the axial direction. Embodiment 1 and Embodiment 2 differ in the shape of the first insertion portion.

The first core plate 50 has a protrusion 502 and a pair of slits 503. The protruding portion 502 protrudes toward the inside of the first insertion portion 501 and comes into contact with the magnet 2 . The pair of slits 503 are positioned with the proximal end 504 of the protrusion 502 interposed therebetween.

The pair of slits 503 extend in the direction in which the protrusion 502 protrudes from the base end 504. Here, the pair of slits 503 extend in the radial direction with respect to the base end portion 504. The portion sandwiched between the slits 503 constitutes the protrusion 502. Note that the direction in which the pair of slits 503 extend is not limited to the radial direction.

As shown in FIG. 16, the second core plate 60 has a second insertion portion 601. The second insertion portion 601 is a through hole that penetrates the second core plate 60 in the thickness direction. The second insertion portion 601 constitutes a part of the magnet insertion hole 4. The second insertion portion 601 of the second core plate 60 has a long shape in one direction when the second core plate 60 is viewed from the axial direction. Embodiment 1 and Embodiment 2 differ in the shape of the second insertion portion.

The second insertion portion 601 overlaps with the protrusion portion 502 of the first core plate 50 when the rotor 10A is viewed from the axial direction. Further, the protruding portion 502 of the first core plate 50 partially overlaps the position of the magnet 2 inserted into the magnet insertion hole 4 when the rotor 10A is viewed from the axial direction. As shown in FIG. 16, the second insertion portion 601 has a recessed portion 602 located at a portion recessed in a direction opposite to the protruding direction of the protruding portion 502. As shown in FIG. A portion of the protrusion 502 from the base end 504 to the distal end 505 is located inside the recess 602 when the rotor 10A is viewed from the axial direction.

As shown in FIG. 13, when the magnet 2 is inserted into the magnet insertion hole 4, the protrusion 502 is bent at the base end 504 in the thickness direction of the first core plate 50. A distal end portion 505 of the protruding portion 502 is located within the magnet insertion hole 4 closer to the magnet insertion direction than a base end portion 504 of the protruding portion 502 . The tip portion 505 of the protruding portion 502 is sandwiched between the magnet 2 and the inner surface of the basic insertion portion 801 of the basic core plate 80 .

(Accommodation section and restriction member)
In the first embodiment, the first core plate 5 has the accommodating part 52, whereas in the second embodiment, the second core plate 60 has the accommodating part 603.

As shown in FIG. 13, the accommodating portion 603 is adjacent to the protruding portion 502 on the magnet insertion direction side. Specifically, the housing portion 603 is a portion of the second insertion portion 601 of the second core plate 60 that overlaps with the protrusion portion 502 of the first core plate 50 when the rotor 10A is viewed from the axial direction. For example, the recess 602 of the second insertion section 601 can be used as the housing section 52. The housing portion 603 is connected to the magnet insertion hole 601. That is, the inner surface of the housing portion 603 is connected to the inner surface of the magnet insertion hole 601.

Furthermore, as shown in FIG. 13, the rotor 10A of the second embodiment has a limiting member 7A. The limiting member 7A is housed in the housing portion 603 when the rotor 10A is viewed from the axial direction. Here, the inside of the accommodating part 603 does not need to be completely filled with the restricting member 7A, and a part of the restricting member 7A may protrude outside the accommodating part 603. Further, a part of the accommodating portion 603 may not be filled with the limiting member 7A. Specifically, the limiting member 7A is located in the opposite direction to the tip of the protrusion 502 on the second core plate 60. The restriction member 7A restricts the displacement of the protrusion 502 in the opposite direction. Details of the limiting member 7A will be described later.

(Rotor manufacturing method)
Next, an example of a method for manufacturing the rotor 10A according to the second embodiment will be described using FIG. 17. The manufacturing method of the rotor 10A according to the second embodiment includes a core plate forming step S1, a core plate laminating step S2, a magnet inserting step S3, a limiting member housing step S4, and a magnetizing step S5, as in FIG. 7 of the first embodiment. have

The core plate forming step S1 is a step of forming the basic core plate 80, the first core plate 50, and the second core plate 60. A basic core plate 80 having a basic insertion portion 801 is formed by the core plate forming step S1. Further, a first core plate 50 having a first insertion portion 501, a protrusion 502, and a pair of slits 503 is formed. Further, a second core plate 60 having a second insertion portion 601 and a housing portion 603 is formed.

Here, before the limiting member 7A is accommodated, the accommodating portion 603 is a space. Therefore, if the protruding part 502 is pushed in the opposite direction while the accommodating part 603 does not accommodate the limiting member 7A, the protruding part 502 may be deformed in the opposite direction. In other words, the accommodating part 603 is a displacement allowing part that allows the protrusion 502 to be displaced in the opposite direction when the accommodating part 603 does not accommodate the limiting member 7A. Therefore, the core plate forming step is also a step of forming a displacement allowing portion on the second core plate 60 that allows the protruding portion 502 to be displaced in the opposite direction.

The core plate lamination process S2 is a process of laminating the basic core plate 80, the first core plate 50, and the second core plate 60 in a predetermined order in the thickness direction. Through the core plate lamination step S2, a cylindrical rotor core 1A having a magnet insertion hole 4 extending in the axial direction is obtained.

The magnet insertion step S3 is a step of inserting the magnet 2 into the magnet insertion hole 4. As shown in FIG. 17, when inserting the magnet 2 into the magnet insertion hole 4, the tip of the magnet 2 presses the protrusion 502. As a result, the protruding portion 502 is bent in the magnet insertion direction. By pushing the magnet 2 into the magnet insertion hole 4 , the tip 505 of the protrusion 502 is sandwiched between the magnet 2 and the inner surface of the magnet insertion hole 4 .

The limiting member accommodating step S4 is a step of accommodating the limiting member 7A in the accommodating portion 603, that is, the displacement allowing portion. In the second embodiment, as shown in FIG. 13, after the magnet insertion step S3, the accommodating portion 603 of the second core plate 60 is filled with resin.

In the second embodiment, the limiting member 7A is a resin that has fluidity in the initial state and can be cured after being injected into the storage section 603. For example, the limiting member 7A is an adhesive. Note that the limiting member 7A may be a resin that is cured by evaporation of components, a resin that is cured by light energy or thermal energy, or a resin that is cured by a chemical reaction.

Specifically, in the limiting member accommodating step S4, the limiting member 7A is injected into the accommodating portion 603. For example, a syringe (not shown) is inserted into the magnet insertion hole 4 from the axial end surface of the rotor core 1A. The restriction member 7A is injected into the accommodating portion 603 using a syringe (not shown). As a result, the space in the housing portion 603 is filled with resin.

After the limiting member housing step S4, a magnetizing step S5 is performed. The magnetization step S5 is a step of magnetizing the magnet 2 inserted into the magnet insertion hole 4.

When the magnet 2 inserted into the magnet insertion hole 4 is magnetized, if the accommodating part 603 does not accommodate the limiting member 7A, the protruding part 502 can be deformed in the opposite direction due to the space of the accommodating part 603. There is sex. However, the second core plate 60 of the second embodiment has a housing portion 603 at a position overlapping with the protrusion 502 of the first core plate 50 when the rotor 10A is viewed from the axial direction. According to this configuration, the restricting member 7A in the accommodating portion 603 of the second core plate 60 suppresses displacement by the protruding portion 502 in the direction of the accommodating portion 603. Therefore, the protrusion 502 can more reliably hold the magnet 2 inserted into the magnet insertion hole 4.

Furthermore, in the second embodiment, the limiting member 7A is a resin filled in the accommodating portion 603. According to this configuration, the interior of the accommodating portion 603 can be filled with the limiting member 7A by filling the resin. Thereby, the rotor 10A in which the displacement of the protruding portion 502 of the first core plate 50 is suppressed can be easily manufactured. Note that the limiting member 7A may be a bar or may not be made of resin.

(Embodiment 3)
Next, an example of the rotor 10B according to the third embodiment will be described with reference to FIGS. 18 and 19. The rotor 10B of the third embodiment differs from the rotor 10 of the first embodiment in that it includes a third core plate 9. In other respects, the configuration of the third embodiment is the same as the configuration of the first embodiment. In the following, the same components as those in Embodiment 1 are denoted by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 18, the rotor core 1B of the third embodiment has a third core plate 9. The third core plate 9 has a third insertion portion 91 and a covering portion 92. The third core plate 9 is laminated adjacent to the first core plate 5 at the axial end of the rotor core 1B.

The third insertion portion 91 is a through hole that penetrates the third core plate 9 in the thickness direction. The magnet 2 is located within the third insertion portion 91 . The third insertion portion 91 constitutes a part of the magnet insertion hole 4 .

The covering portion 92 covers at least a portion of the through hole of the first core plate 5 constituting the housing portion 52 in the axial direction. Further, the covering portion 92 has a caulked portion recessed in the axial direction. In the third embodiment, the caulking portion is the limiting member 7B.

As shown in FIG. 18, when the second core plate 6 is viewed from the axial direction, the caulking portion is a portion of the covering portion 92 that is recessed on one surface of the second core plate 6 at a position overlapping with the housing portion 52. This is the part that protrudes from the other surface. Specifically, the caulking portion protrudes into the interior of the housing portion 52.

Furthermore, as shown in FIG. 18, the portion of the caulking portion that protrudes toward the first core plate 5 side is in contact with the inner surface of the accommodating portion 52. Thus, in the third embodiment, the limiting member 7B is a caulked portion of the covering portion 92 of the third core plate 9 that protrudes toward the first core plate 5 side. Since the third core plate 9 is a steel plate, the limiting member 7B of this embodiment is made of metal.

In the method for manufacturing the rotor 10B of the third embodiment, the third core plate 9 is formed in the core plate forming step S1. Further, in the core plate lamination step S2, the third core plate 9 is laminated adjacent to the first core plate 5 at the end of the rotor 10B in the axial direction.

Furthermore, the manufacturing method of the third embodiment differs from the first embodiment in that the restricting member 7B is formed using the caulking tool 70 in the restricting member housing step S4. For example, as shown in FIG. 19, one end of the caulking tool 70 is pressed against the covering portion 92. The other end of the caulking tool 70 is pressurized in the axial direction. As a result, the limiting member 7B that protrudes into the interior of the accommodating portion 52 is formed.

Note that the magnet insertion step S3 and magnetization step S5 of the third embodiment are the same as those of the first embodiment.

In the rotor 10B of the third embodiment, the limiting member 7B is a caulking portion of the covering portion 92 that protrudes into the interior of the housing portion 52 at a position overlapping the housing portion 52 when the first core plate 5 is viewed from the axial direction. . According to this configuration, the caulking portion of the covering portion 92 located within the housing portion 52 limits displacement of the protruding portion 54 in the opposite direction. Thereby, the rotor 10B in which the displacement of the protruding portion 54 of the first core plate 5 is suppressed can be easily manufactured. Therefore, the rotor 10B that can suppress a decrease in the holding force for holding the magnet 2 inserted into the magnet insertion hole 4 is realized.

As described above, the rotors 10, 10A, and 10B according to Embodiments 1, 2, and 3 have the following characteristics.

(1) The rotors 10, 10A, 10B according to the embodiment include columnar rotor cores 1, 1A, 1B having a plurality of core plates 3 stacked in the thickness direction and a magnet insertion hole 4 extending in the axial direction; A magnet 2 inserted into the magnet insertion hole 4. The plurality of core plates 3 are stacked adjacent to the first core plates 5 and 50 in the magnet insertion direction of the magnet 2, and are arranged in a part of the magnet insertion hole 4. 2nd core plates 6, 60 having insertion portions (second insertion portions 61, 601) constituting. The first core plates 5, 50 constitute a part of the inner surface of the magnet insertion hole 4, and protrude inward of the insertion portion when the rotors 10, 10A, 10B are viewed from the axial direction. It has protrusions 54, 502 that come into contact with 2. Further, the rotors 10, 10A, 10B are arranged in the first core plate 5 or the second core plate 60 with respect to the protrusions 54, 502 when the rotors 10, 10A, 10B are viewed from the axial direction. accommodating parts 52 and 603 located in a direction opposite to the protruding direction of the protruding parts 54 and 502; 54 in the opposite direction.

(2) In the rotor 10, 10B described in (1), the plurality of core plates 3 have a plurality of the first core plates 5. Each of the plurality of first core plates 5 has the accommodating portion 52. The accommodating portion 52 is a through hole located in the opposite direction to the protruding portion 54 of the first core plate 5 and passing through each of the plurality of first core plates 5 in the thickness direction. The limiting members 7, 7B are located within the through hole.

(3) In the rotor 10A described in (1), the second core plate 60 has the accommodation portion at a position overlapping with the protrusion 502 of the first core plate 50 when looking at the rotor core 1B from the axial direction. 603.

(4) In the rotor 10 described in (2), the through hole opens in the end surface of the rotor core 1 in the axial direction.

(5) In the rotor 10, 10A described in any one of (1) to (4), the limiting members 7, 7A include a bar inserted into the accommodating portion 52.

(6) In the rotor 10, 10A described in (1) or (5), the limiting members 7, 7A are resin filled in the accommodating portion 52.

(7) In the rotor 10B described in (2), the rotor core 1B is laminated adjacent to the first core plate 5 at an axial end thereof, and at least a portion of the through hole is formed in the axial direction. The limiting member 7B includes a third core plate 9 having a covering portion 92, and the limiting member 7B is located inside the through hole at least at a position overlapping with the through hole when the first core plate 5 is viewed from the axial direction. This is the covering portion 92 that protrudes.

(8) The motor includes the rotor 10, 10A, 10B according to any one of (1) to (7), and a stator having a stator coil and a stator core.

(9) The method for manufacturing the rotors 10, 10A, and 10B according to the embodiment includes a cylindrical rotor core 1 having a plurality of core plates 3 stacked in the thickness direction and a magnet insertion hole 4 extending in the axial direction; This is a method for manufacturing rotors 10, 10A, and 10B that include magnets 1A, 1B, and magnets 2 inserted into the magnet insertion holes 4. In this manufacturing method, first core plates 5 and 50 are stacked adjacent to the first core plates 5 and 50 in the magnet insertion direction of the magnet 2, and constitute a part of the magnet insertion hole 4. forming a second core plate 6, 60 having an insertion part (second insertion part 61, 601), and forming a part of the inner surface of the magnet insertion hole 4 in the first core plate 5, 50, When the rotors 10, 10A, 10B are viewed from the axial direction, protrusions 54, 502 are formed that protrude toward the inside of the insertion portion and come into contact with the magnets 2, and the first core plates 5, 50 or the first In the two-core plates 6, 60, a displacement is located in a direction opposite to the protrusion direction of the protrusions 54, 502 with respect to the protrusions 54, 502, and allows displacement of the protrusions 54, 502 in the opposite direction. The core plate forming step that forms the permissible portion and the stacking of the plurality of core plates 3 including the first core plates 5, 50 and the second core plates 6, 60 in the thickness direction, a core plate lamination step for obtaining the columnar rotor cores 1, 1A, 1B having magnet insertion holes 4; a magnet insertion step for inserting the magnets 2 into the magnet insertion holes 4 of the rotor cores 1, 1A, 1B; After the magnet insertion step, in the first core plate 5, 50 or the second core plate 6, 60, the limiting members 7, 7A, 7B that limit the displacement of the protrusions 54, 502 in the opposite direction are installed. The method includes a limiting member housing step S4 in which the limiting member is accommodated in the displacement allowing portion, and a magnetizing step in which the magnet 2 inserted into the magnet insertion hole 4 is magnetized after the limiting member containing step S4.

(Other embodiments)
Although the embodiments of the present invention have been described above, the embodiments described above are merely examples for implementing the present invention. Therefore, without being limited to the embodiments described above, the embodiments described above can be modified and implemented as appropriate without departing from the spirit thereof.

In the first embodiment, the accommodating portion 52 of the first core plate 5 located at the end face of the rotor core 1 is a through hole that opens at the end face of the rotor core 1 in the axial direction and penetrates the first core plate 5 in the thickness direction. . However, the accommodation portion of the first core plate located on the end surface of the rotor core may not penetrate the first core plate in the thickness direction, but may be a recessed portion.

In the second embodiment, the second core plate 60 has a housing portion 603 at a position overlapping with the protruding portion 502 of the first core plate 50 when the rotor 10A is viewed from the axial direction. However, when the rotor is viewed from the axial direction, the accommodating portion may have a portion that overlaps with the protruding portion of the first core plate and a portion that does not overlap.

In the first embodiment, the restricting member 7 is a rod made of resin and inserted into the accommodating portion 52. However, in the first embodiment, the bar is not limited to being made of resin, and may be made of metal, for example. Furthermore, the limiting member is not limited to a rod, but may be a resin that has fluidity in an initial state and hardens after injection. Furthermore, the rod and the resin may be used together as the limiting member.

In the first embodiment, one bar is inserted into one accommodating portion 52. However, a plurality of rods may be inserted into one housing part.

In the second embodiment, the liquid is injected into the accommodating portion 603 of the second core plate 60. However, a rod may also be inserted into the housing. Furthermore, the rod material and the resin may be used together for the limiting member.

In the second embodiment, the accommodating portion 603 of the second core plate 60 is filled with resin. However, the accommodating portion of the second core plate may be filled with a material other than resin. For example, the accommodating portion of the second core plate may be filled with metal or non-metal material.

In the second embodiment, the limiting member 7A is injected into the accommodating portion 603 of the second core plate 60. However, in the injection process, the limiting member may also be injected into a space other than the accommodating part of the magnet insertion hole.

In the second embodiment, the laminated group 31 includes one first core plate 50, one second core plate 60, and a plurality of basic core plates 80. However, the laminated group may include a plurality of first core plates or a plurality of second core plates. Further, the number of basic core plates included in the laminated group may be one.

In the second embodiment, the second core plate 60 has a recess 602. However, the second core plate 60 does not need to have a recess.

The rotor core 1B of the third embodiment has a third core plate 9. Here, the third core plate 9 before the formation of the caulked portion may have the same shape as the second core plate 6. That is, the second core plate may be laminated on the axial end of the rotor adjacent to the first core plate, and the caulking portion may be formed on the second core plate.

In the third embodiment, the caulking portion is the limiting member 7B. However, the caulking portion may protrude into the accommodating portion and the accommodating portion may be filled with resin.

In the first and third embodiments, the second core plate 6 does not penetrate through the portion of the second core plate 6 that overlaps with the accommodation portion 52 of the first core plate 5 when viewed from the axial direction of the rotors 10, 10B. However, the portion of the second core plate that overlaps with the accommodation portion of the first core plate may be penetrated when the rotor is viewed from the axial direction.

In the first and third embodiments, the plurality of first core plates 5 are successively stacked. However, a plurality of first core plates 5 do not need to be successively stacked.

In the first and third embodiments, the plurality of second core plates 6 are successively stacked. However, a plurality of second core plates 6 need not be laminated in succession.

In the first and third embodiments, the accommodating portion 52 is located radially inward with respect to the first insertion portion 51. However, the accommodating part only needs to be located on the opposite side of the magnet with the holding part in between with respect to the first insertion part. That is, when viewed from the axial direction, with respect to the first insertion portion that constitutes a part of the magnet insertion hole extending in the radial direction of the rotor core, the accommodating portion is located on one or the other side of the first core plate in the circumferential direction. All you have to do is stay there.

In the first and third embodiments, the first core plate 5 has two accommodating parts 52 for one first insertion part 51. However, the first core plate may have one, three or more than three receptacles for one first insert.

In the first and third embodiments, the first core plate 5 has the accommodating portions 52 for all the first insertion portions 51. However, the first core plate may have an accommodating portion for some of the first insertion portions.

In the first and third embodiments, the first core plate 5 has the holding portions 53 for all the first insertion portions 51. However, the first core plate may have a holding portion for some of the first insertion portions.

In the first and third embodiments, the first core plate 5 has one accommodating part 52 for one holding part 53. However, the number of holding parts may be different from the number of accommodating parts.

In the first and third embodiments, the accommodating portion 52 has a rectangular shape when viewed from the axial direction. However, the through hole of the accommodating portion may have a shape other than a rectangle. The through hole may have any shape as long as it can deform the holding part in the direction in which the holding part and the accommodating part are arranged.

In the first and third embodiments, the plurality of accommodating portions 52 have the same shape. However, some receptacles may have different shapes.

The present invention can be used for a motor rotor.

100 Motor 102 Stator 103 Housing 104 Shaft 105 Stator core 106 Stator coils 10, 10A, 10B Rotor 1, 1A, 1B Rotor core 1a Shaft insertion hole 2 Magnet 3 Core plate 31 Laminated group 4 Magnet insertion hole 5, 50 First core plate 51, 501 First insertion part 51a Inner surface 52 Accommodating part (displacement allowance part)
53 Holding parts 54, 502 Projection part 503 Slit 504 Base end part 505 Tip part 6, 60 Second core plate 61, 601 Second insertion part 62 Cover part 602 Recess part 603 Accommodation part (displacement allowance part)
7, 7A, 7B Limiting member 70 Caulking tool 80 Basic core plate 801 Basic insertion part 9 Third core plate 91 Third insertion part 92 Covering part P Central axis

Claims (9)

a columnar rotor core having a plurality of core plates stacked in the thickness direction and a magnet insertion hole extending in the axial direction;
A rotor comprising a magnet inserted into the magnet insertion hole,
The plurality of core plates include a first core plate and a second core plate that is stacked adjacent to the first core plate in the magnet insertion direction of the magnet and has an insertion portion that forms a part of the magnet insertion hole. having a core plate;
The first core plate constitutes a part of the inner surface of the magnet insertion hole, and when the rotor is viewed from the axial direction, the first core plate has a protrusion that protrudes inward of the insertion portion and comes into contact with the magnet,
In the first core plate or the second core plate, an accommodating portion located in a direction opposite to the protrusion direction of the protrusion with respect to the protrusion when the rotor is viewed from the axial direction;
a limiting member that is housed in the accommodation portion at a position in the opposite direction relative to the protrusion and limits displacement of the protrusion in the opposite direction. The rotor according to claim 1,
The plurality of core plates include a plurality of the first core plates,
Each of the plurality of first core plates has the accommodation portion,
The accommodating portion is a through hole located in the opposite direction to the protruding portion of the first core plate and penetrating each of the plurality of first core plates in the thickness direction,
The rotor, wherein the limiting member is located within the through hole. The rotor according to claim 1,
In the rotor, the second core plate has the accommodation portion at a position overlapping the protrusion of the first core plate when the rotor core is viewed from the axial direction. The rotor according to claim 2,
In the rotor, the through hole is open to an end surface of the rotor core in the axial direction. The rotor according to any one of claims 1 to 3,
The rotor, wherein the limiting member includes a bar inserted into the housing part. The rotor according to claim 2 or 3,
In the rotor, the limiting member is a resin filled in the accommodating portion. The rotor according to claim 2,
a third core plate laminated adjacent to the first core plate at an axial end of the rotor core and having a covering portion that covers at least a portion of the through hole in the axial direction;
In the rotor, the limiting member is a covering portion protruding into the through hole at least at a position overlapping the through hole when the first core plate is viewed from the axial direction. A rotor according to any one of claims 1 to 3,
A motor comprising: a stator having a stator coil and a stator core. a cylindrical rotor core having a plurality of core plates stacked in the thickness direction and a magnet insertion hole extending in the axial direction;
A method of manufacturing a rotor comprising: a magnet inserted into the magnet insertion hole,
forming a first core plate and a second core plate that is laminated adjacent to the first core plate in the magnet insertion direction of the magnet and has an insertion portion that constitutes a part of the magnet insertion hole; ,
In the first core plate, a protrusion is formed that forms part of the inner surface of the magnet insertion hole, and protrudes toward the inside of the insertion portion when viewed from the axial direction of the rotor core and comes into contact with the magnet,
In the first core plate or the second core plate, a displacement allowing portion is formed, which is located in a direction opposite to the protrusion direction of the protrusion with respect to the protrusion, and allows displacement of the protrusion in the opposite direction. A core plate forming process,
a core plate laminating step of obtaining the columnar rotor core having the magnet insertion hole extending in the axial direction by laminating the plurality of core plates including the first core plate and the second core plate in the thickness direction;
a magnet insertion step of inserting the magnet into the magnet insertion hole of the rotor core;
After the magnet insertion step, in the first core plate or the second core plate, a limiting member accommodating step of accommodating a limiting member that limits displacement of the protruding portion in the opposite direction in the displacement allowing portion;
a magnetizing step of magnetizing the magnet inserted into the magnet insertion hole after the limiting member housing step;
A method for manufacturing a rotor, comprising:

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