WO2021187216A1

WO2021187216A1 - Rotor and rotary machine

Info

Publication number: WO2021187216A1
Application number: PCT/JP2021/009125
Authority: WO
Inventors: 洋平 ▲高▼橋; 好晴内藤; 貴彦大石
Original assignee: 株式会社明電舎
Priority date: 2020-03-19
Filing date: 2021-03-09
Publication date: 2021-09-23
Also published as: JP2021151090A; JP6897826B1

Abstract

[Problem] To provide a rotor 5 with which magnetic torque can be efficiently produced.　[Solution] The eight recessed sections 9a of a second end plate 9 are aligned in the radial direction relative to eight groups of magnets 5d held on a rotor core 5a, and are arranged in a position so as to be located on the outside in the radial direction. The eight recessed sections of a first end plate (not illustrated), between the second end plate 9 and which the rotor core 5a is sandwiched, also are aligned in the radial direction relative to the eight magnet groups held on the rotor core 5a, and are arranged in a position so as to be located on the outside in the radial direction.

Description

Rotor and rotating machine

The present invention relates to a rotor and a rotating machine.

Conventionally, a rotor core that holds a plurality of magnets extending in the axial direction (extending direction of the rotation axis) in a circumferential direction, a first plate material that is in close contact with one end surface of the rotor core in the axial direction, and the other side of the rotor core in the axial direction. A rotor including a second plate material that is in close contact with the end face is known.

For example, the rotor described in Patent Document 1 includes a rotor core that holds eight pairs of permanent magnets in a circumferential direction, an annular first end plate that is a first plate material, and an annular shape that is a second plate material. A second end plate is provided. The first end plate includes eight refrigerant pockets, which are recesses that are recessed from the outside to the inside in the radial direction about the rotation axis. The eight refrigerant pockets are arranged at equal intervals in the circumferential direction centered on the rotation axis. When viewed from one side in the axial direction, the first end plate is arranged in such a position that each of the eight pairs of permanent magnets held by the rotor core is located in each of the eight refrigerant reservoir pockets. Also, when viewed from the other side in the axial direction, the second end plate is arranged so that each of the eight pairs of permanent magnets held by the rotor core is located in each of the eight refrigerant reservoir pockets. NS.

According to Patent Document 1, in a rotor having such a configuration, a permanent magnet can be efficiently cooled by collecting a refrigerant such as cooling oil in a refrigerant reservoir pocket.

Patent No. 5545180

However, the rotor described in Patent Document 1 has a problem that it is difficult to efficiently exert the magnet torque by the permanent magnet. Specifically, as the first end plate and the second end plate (hereinafter, also simply referred to as end plates), from the role of strongly pressing the rotor core from both sides in the axial direction, from a steel plate having a certain thickness and high rigidity. It is common to use the one that becomes. In the rotor described in Patent Document 1, since the permanent magnet located in the refrigerant reservoir pocket of the end plate and the magnetic end plate are close to each other, it is easy to generate magnetic field lines extending from the permanent magnet to the end plate. Then, since the number of magnetic field lines extending from the permanent magnet to the stator in the radial direction is reduced, it becomes difficult to efficiently exert the magnet torque.

The present invention has been made in view of the above background, and an object of the present invention is to provide a rotor and a rotating machine capable of efficiently exerting magnet torque.

One aspect of the present invention is a rotor core that holds a plurality of magnets extending in the axial direction in a circumferential direction, a first plate material that is in close contact with one end surface of the rotor core in the axial direction, and the other side of the rotor core in the axial direction. A rotor provided with a second plate material that is in close contact with the end face, and each of the first plate material and the second plate material is provided with a plurality of recesses dented from the outside to the inside in the radial direction in a circumferential direction. , The first plate material is arranged in a posture in which each of the plurality of the recessed portions is arranged in the radial direction with respect to the magnet held by the rotor core and is positioned outside in the radial direction, and the second plate material is arranged. Each of the plurality of recessed portions is arranged in a radial direction with respect to the magnet held by the rotor core, and is arranged so as to be located outside in the radial direction.
Is.

According to the present invention, there is an excellent effect that the magnet torque can be efficiently exerted.

It is a perspective view which shows the motor system which concerns on embodiment. It is a perspective view which shows the rotor and the shaft arranged in the hollow of the motor housing of the motor system. It is a perspective view which shows the stator of the motor part of the motor system together with various members arranged in the hollow. It is a vertical cross-sectional view which shows the rotor of the motor part and the peripheral member thereof. It is a figure which shows the rotor, the 2nd end plate, a shaft, and a nut from the other side in the axial direction. It is a figure which shows the 1st end plate of the motor part from one side in the axial direction. It is sectional drawing which shows the 1st end plate and the 2nd end plate in the state which the positioning is performed in the radial direction and the circumferential direction with respect to a rotor core by a positioning shaft.

Hereinafter, an embodiment of a motor system to which the present invention is applied will be described with reference to each figure. Hereinafter, the direction along the rotation axis of the rotor and the direction parallel to the same direction are simply referred to as the axial direction. Further, the radial direction centered on the rotation axis is simply referred to as the radial direction, and the circumferential direction centered on the rotation axis is simply referred to as the circumferential direction.

FIG. 1 is a perspective view showing the motor system 1 according to the embodiment from the other side of one side and the other side in the axial direction. The motor system 1 includes a motor unit 2 which is a rotating machine and an inverter unit 50 which is an electrical component unit. The motor unit 2 includes a motor housing 3 made of a cast product, an electric oil pump 40, an oil cooler 42, and the like. Further, the inverter unit 50 includes an inverter housing and an inverter case made of a cast product, an inverter circuit (not shown), and the like. The inverter circuit is arranged in the hollow of the inverter housing.

The alternate long and short dash line in the figure is the rotating axis L of the rotor, which will be described later. Further, the side in the direction of arrow A in the drawing is an example of one side in the axial direction in the present invention. Further, the side in the direction of arrow B in the drawing is an example of the other side in the axial direction in the present invention.

The motor unit 2 and the inverter unit 50 are adjacent to each other in the axial direction. The inverter unit 50 is located on the other side (arrow B direction side) in the axial direction from the motor unit 2.

In the motor unit 2, an oil pan is arranged in the hollow of the motor housing 3. The electric oil pump 40 sucks the oil stored in the oil pan and discharges it toward the oil cooler 41. The oil cooler 42 includes a refrigerant passage (not shown) and an oil flow path adjacent to the refrigerant passage in the housing. Refrigerant such as coolant sent from the outside flows through the refrigerant path. Further, the oil sent from the electric oil pump 40 flows through the oil flow path. The oil is cooled by heat exchange with the refrigerant in the refrigerant passage in the process of flowing through the oil flow path. The cooled oil flows out of the oil cooler 42 and is returned into the hollow of the motor housing 3.

FIG. 2 is a perspective view showing a rotor 5 and a shaft 6 arranged in a hollow of a motor housing (FIG. 1-2). The rotor 5 is a magnet-embedded type (IPM: embedded magnet type (IPM: Interior permanent Magnet) rotor. The rotor 5 includes a cylindrical rotor core 5a and eight sets of magnet sets 5d. Eight sets. Each of the magnet sets 5d of the above includes an outer magnet pair 5b and an inner magnet pair 5c, and is arranged at equal intervals along the circumferential direction.

The two permanent magnets in the outer magnet pair 5b are arranged in a posture in which they are aligned in the circumferential direction and the distance between them increases from the inside to the outside in the radial direction. The inner magnet pair 5c is located between the two permanent magnets in the outer magnet pair 5b. The two permanent magnets in the inner magnet pair 5c are arranged so as to be aligned in the circumferential direction and to increase the distance from each other from the inner side to the outer side in the radial direction.

The shaft-shaped shaft 6 penetrates the shaft hole provided in the center of the cylindrical rotor core 5a in the axial direction, is located on the rotation axis L of the rotor 5, and is rotationally driven together with the rotor 5.

FIG. 3 is a perspective view showing the stator 7 together with various members arranged in the hollow thereof. The stator 7 includes a cylindrical stator core 7a and a plurality of flat wire coils 7b as windings wound around the stator core 7a along the axial direction. In the axial direction, each of the plurality of flat wire coils 7b is folded back in a region on one side of the end on one side (arrow A direction side) of the stator core 7a and extends toward the other side.

Both ends in the longitudinal direction of each of the plurality of flat wire coils 7b project from the other side (arrow B direction side) end in the axial direction of the stator core 7a toward the other side and are connected to each other by welding.

Note that in FIG. 3, the rotor (5 in FIG. 2) is hidden behind the second magnet cover 11 and is not shown. The rotor and the axially central portion of the shaft 6 are arranged in the hollow of the cylindrical stator 7. The second magnet cover 11 will be described later.

FIG. 4 is a vertical cross-sectional view showing the rotor 5 and its peripheral members. The motor unit (2 in FIG. 1) includes a first end plate 8, a second end plate 9, a first magnet cover 10, a second magnet cover 11, an intermediate member 12, a nut 13, and a bolt 14.

A center hole 12a is arranged at the center of the intermediate member 12 made of a flat annular metal. The shaft 6 penetrates through the center hole 12a of the intermediate member 12.

Both the first end plate 8 and the second end plate 9 are made of a flat annular metal. Hereinafter, the first end plate 8 which is the first plate material and the second end plate 9 which is the second plate material are also collectively referred to as end plates (8, 9).

At the center of the end plate (8, 9), a center hole (8e, 9e) penetrating in the axial direction is arranged. The shaft 6 penetrates through the center holes (8e, 9e). The shaft 6 is provided with an abutting portion 6a projecting in the radial direction on one side in the axial direction, and a male screw portion 6b on the other side in the axial direction.

The first end plate 8 held by the shaft 6 is interposed between the abutting portion 6a of the shaft 6 and one side end surface (arrow A direction side end surface) 5a1 of the rotor core 5a in the axial direction, and is on one side. It adheres to the end face 5a1. Further, the second end plate 9 held by the shaft 6 is interposed between the other end surface (arrow B direction side end surface) 5a2 of the rotor core 5a and the intermediate member 12 in the axial direction, and is interposed between the other side end surface 5a2. Adhere to.

The nut 13 is screwed into the male threaded portion 6b of the shaft 6 on the other side (arrow B direction side) in the axial direction from the intermediate member 12, so that the rotor core 5a is interposed via the intermediate member 12 and the second end plate 9. Press toward one side. Then, due to the reaction force of the above-mentioned pressing, the abutting portion 6a of the shaft 6 presses the rotor core 5a toward the other side in the axial direction via the first end plate 8. In this way, the rotor core 5a is pressed from both sides in the axial direction.

FIG. 5 is a view showing the rotor 5, the second end plate 9, the shaft 6, and the nut 13 from the other side in the axial direction. As shown in the figure, the second end plate 9 includes eight recesses 9a that are recessed from the outside to the inside in the radial direction, and eight convex portions 9b that are portions between the recesses 9a adjacent to each other. The second end plate 9 is arranged in such a posture that the eight recessed portions 9a are arranged in the radial direction with respect to the eight sets of magnet sets 5d held by the rotor core 5a and are located outside in the radial direction. Further, although not shown, the first end plate (8 in FIG. 4) is also arranged in the same posture as the second end plate 9.

In such an arrangement, the distance between the magnet assembly 5d and the end plate (8, 9) is made larger than the depth of the recessed portion of the end plate (8, 9) in the radial direction. According to this configuration, the number of magnetic field lines extending from the permanent magnet to the end plate (8, 9) is reduced as compared with the conventional configuration in which the permanent magnet is located in the refrigerant reservoir pocket which is a recess in the radial direction. The magnet torque can be efficiently exerted.

As shown in FIG. 4, the second magnet cover 11 as the second cover member covers at least the outer region in the radial direction from the second end plate 9 in the entire area of the other end surface 5a2 of the rotor core 5a. In close contact. As shown in FIG. 3, the second magnet cover 11 in close contact with the magnet covers the other side (arrow B direction side) of each of the eight magnet sets (5d in FIG. 5) in the axial direction.

Further, as shown in FIG. 4, the first magnet cover 10 as the first cover member is at least a region radially outer of the first end plate 8 in the entire area of the rotor core 5a on one side end surface 5a1. Adhere to. The first magnet cover 10 that is in close contact with the magnet covers one side (arrow A direction side) in the axial direction of each of the eight magnet sets.

According to the motor system 1 having such a configuration, the first magnet cover 10 and the second magnet cover 11 can prevent the permanent magnets from falling off from the rotor core 5a. Hereinafter, the first magnet cover 10 and the second magnet cover 11 are also collectively referred to as magnet covers (10, 11).

As shown in FIG. 4, the thickness of the inner edge portion in the radial direction of the magnet cover (10, 11) is thinner than the thickness of the outer edge portion. The thin inner edge portion of the magnet cover (10, 11) and the convex portion of the end plate (8, 9) are in close contact with each other in the axial direction.

According to this configuration, the magnet cover (10, 11) can be held by the rotor core 5a by utilizing the force of pressing the rotor core 5a from both sides in the axial direction by the end plates (8, 9).

FIG. 6 is a view showing the first end plate 8 from one side in the axial direction (the side in the direction of arrow A). As shown by the alternate long and short dash line in the figure, the shape of the convex portion 8b of the first end plate 8 is a shape that is curved with a curvature centered on the rotation axis L. The shape of the convex portion (9b in FIG. 5) of the second end plate is also the same as the shape of the convex portion 8b of the first end plate 8.

According to this configuration, the tip of the convex portion (8b, 9b) of the end plate (8, 9) is brought into contact with the inner wall of the annulus of the magnet cover (9, 10) to bring the magnet cover (9, 19) into contact with the inner wall. It can be positioned in the radial direction.

As shown in FIGS. 5 and 6, of the eight convex portions (8b, 9b) on the end plate (8, 9), the four convex portions (8b, 9b) that are not adjacent to each other are provided with male threads. Female thread through holes (8c, 9c) for screwing bolts (14 in FIG. 4) are arranged. Further, positioning holes (8d, 9d) penetrating in the axial direction are arranged in the other four convex portions (8b, 9b).

As shown in FIG. 4, a through hole 11g penetrating in the axial direction is arranged at the inner edge of the second magnet cover 11. Although only two through-holes 11g are shown in FIG. 4, eight through-holes 11g are arranged at equal intervals in the circumferential direction on the inner edge of the second magnet cover 11. Further, although not shown, the first magnet cover 10 is also provided with eight similar through-holes.

On one side and the other side in the axial direction, the bolt 14 penetrates the through hole (for example, 11 g) of the magnet cover (10, 11), and the female screw through hole (6c, 6c,) of the end plate (8, 9). Screw into 9c). By this screwing, the first magnet cover 10 can be fixed to the first end plate 8 and the second magnet cover 11 can be fixed to the second end plate 9.

In such a configuration, since the head of the bolt 14 is vertically overlapped with the convex portions (8b, 9b) located at positions away from the shaft 6 in the radial direction, an empty space is formed around the head of the bolt 14. NS. Therefore, according to the motor system 1, the bolt 14 can be easily tightened without causing a tool such as a spanner to interfere with the shaft 6 or the nut 13 fixed to the shaft.

The rotor core 5a is provided with a through hole 5a3 that penetrates in the axial direction. Although only two through holes 5a3 are shown in FIG. 4, eight through holes 5a3 arranged at equal intervals in the circumferential direction are arranged in the rotor core 5a. The tip of the bolt 14 that has screwed through the female screw through hole (8c, 9c) of the convex portion (8b, 9b) of the end plate (8, 9) enters the through hole 5a3 of the rotor core 5a.

According to such a configuration, even if there is a thickness error in the end plate (8, 9) and the magnet cover (10, 11), the end plate (8, 9) and the magnet cover (10, 11) can be securely tightened. A magnet 14 having an extra length can be used.

FIG. 7 is a cross-sectional view showing an end plate (8, 9) in a state where the positioning shaft 90 is positioned in the radial direction and the circumferential direction with respect to the rotor core 5a. At the time of manufacturing the rotor 5, a long positioning shaft 90 is penetrated through the positioning hole 9d of the second end plate 9. The positioning shaft 90 that penetrates the positioning hole 9d of the second end plate 9 penetrates the positioning hole 8d of the first end plate 8 after penetrating the through hole 5a3 of the rotor core 5a. The four positioning shafts 90 individually penetrate the four positioning holes (8d, 9d) of the end plates (8, 9) and the four through holes 5a3 of the rotor core 5a. As a result, the end plates (8, 9) are positioned radially and circumferentially with respect to the rotor core 5a.

Although an example in which the present invention is applied to the motor unit 2 as a rotating machine has been described, the present invention can also be applied to a generator (dynamo) as a rotating machine.

The present invention is not limited to the above-described embodiment, and a configuration different from the embodiment may be adopted within the range to which the configuration of the present invention can be applied. The present invention exerts a peculiar action and effect for each aspect described below.

[First aspect]
The first aspect is a rotor core (for example, a rotor core 5a) that holds a plurality of magnets extending in the axial direction (for example, a magnet set 5d) in a circumferential direction, and an axial one-side end surface (for example, one-side end surface 5a1) of the rotor core. A first plate material (for example, the first end plate 8) that comes into close contact with the rotor core and a second plate material (for example, the second end plate 9) that comes into close contact with the other end surface (for example, the other end surface 5a2) in the axial direction of the rotor core are provided. A rotor (for example, rotor 5) in which each of the first plate material and the second plate material is provided with a plurality of recesses (for example, recesses 8a and 9a) that are recessed from the outside to the inside in the radial direction in a circumferential direction. The first plate material is arranged in a posture in which each of the plurality of the recessed portions is arranged in the radial direction with respect to the magnet held by the rotor core and is positioned outside in the radial direction. The plate material is characterized in that each of the plurality of the recessed portions is arranged in a radial direction with respect to the magnet held by the rotor core and is arranged so as to be located outside in the radial direction.

According to this configuration, the magnet torque is made more efficient by reducing the number of magnetic lines extending from the magnet to each of the first plate material and the second plate material, as compared with the conventional configuration in which the magnet is positioned in the recess in the radial direction. It can be demonstrated well.

[Second aspect]
The second aspect comprises the configuration of the first aspect, and each of the plurality of magnets is in close contact with at least an outer region in the radial direction of the first plate material in the entire area of the one side end surface of the rotor core. The first cover member (for example, the first magnet cover 10) that covers one side in the axial direction and the entire area of the other end surface of the rotor core, at least in the region outside the second plate material in the radial direction. The rotor is provided with a second cover member (for example, a second magnet cover (11)) that closely covers the other side of each of the plurality of magnets in the axial direction.

According to this configuration, the first cover member and the second cover member can prevent the magnet from falling off from the rotor core.

[Third aspect]
The third aspect comprises the configuration of the second aspect, in which the thickness of the inner edge portion in the radial direction of each of the first cover member and the second cover member is thinner than the thickness of the outer edge portion, and the first plate members are made of each other. The convex (for example, convex portion 8b) portion that is a portion between the adjacent recessed portions and the inner edge portion of the first cover member are in close contact with each other in the axial direction, and the recessed portions of the second plate material are adjacent to each other. The rotor is characterized in that the convex portion (for example, the convex portion 9b) which is a portion and the inner edge portion of the second cover member are in close contact with each other in the axial direction.

According to such a configuration, the first cover member and the second cover member can be held by the rotor core by utilizing the force of pressing the rotor core from both sides in the axial direction by the first plate material and the second plate material.

[Fourth aspect]
The fourth aspect has the configuration of the third aspect, in which the shape of the convex portion of the first plate material and the shape of the convex portion of the second plate material are curved with a curvature centered on the rotor rotation axis. It is a rotor characterized by being present.

According to such a configuration, the tip of each of the convex portion of the first plate material and the convex portion of the second plate material is brought into contact with the inner wall of each annulus of the first cover member and the second cover member, whereby the first cover is covered. The member and the second cover member can be positioned in the radial direction and the circumferential direction with respect to the rotor core.

[Fifth aspect]
The fifth aspect comprises the configuration of the third aspect or the fourth aspect, in which the inner edge portion of the first cover member is in close contact with the convex portion of the first plate material from one side in the axial direction, and the first aspect is described. 2 The inner edge portion of the cover member is in close contact with the convex portion of the second plate material from the other side in the axial direction, and is axially attached to the inner edge portion of each of the first cover member and the second cover member. A through hole (for example, positioning holes 8d, 9d) penetrating the through hole (for example, positioning holes 8d, 9d) is arranged, and a female screw through hole (for example, female screw through hole 8c, 9c) for screwing a male screw into the convex portion of each of the first plate material and the second plate material. ) Is arranged, and the male screw penetrating the through hole is screwed into the female screw through hole on one side and the other side in the axial direction.

According to this configuration, the male screw can be easily tightened without causing a tool such as a spanner to interfere with the shaft or a member fixed to the shaft.

[Sixth aspect]
The sixth aspect has the configuration of the fifth aspect, in which the rotor core includes a plurality of through holes (for example, through holes 5a3) penetrating in the axial direction, and the plurality of the through holes are arranged in a circumferential direction. The rotor is characterized in that the tip of the male screw penetrating the female screw through hole in each of the plurality of convex portions enters the through hole.

According to such a configuration, even if there is a thickness error in the first plate material, the second plate material, the first cover member, and the second cover member, the first plate material and the first cover member, the second plate material, and the second cover A male screw having an extra length that can be securely tightened to the member can be used.

[7th aspect]
A seventh aspect is a rotor that rotates about a rotation axis, a shaft that penetrates the center of the rotor (for example, shaft 6), and a stator that surrounds the rotor along a circumferential direction centered on the rotation axis (for example, a stator). 7) A rotary machine (for example, a motor unit 2) including the rotor, wherein the rotor is a rotor according to any one of the first to sixth aspects.

According to such a configuration, it is possible to provide a rotating machine that efficiently exerts magnet torque.

The present invention claims priority based on Japanese Patent Application No. 2020-048939, which is a Japanese patent application filed on March 19, 2020, and incorporates all the contents described in the Japanese patent application.

1: Motor system, 2: Motor part (rotary machine), 3; Motor housing, 5: Rotor, 5a: Rotor core, 5a1: One side end face, 5a2: The other side end face, 5a3: Through hole, 5d: Magnet set (magnet) ), 6: Shaft, 7: stator, 7a: stator core, 7b: flat wire coil, 8: 1st end plate (1st plate material), 8a: recessed part, 8b: convex part, 8c: positioning hole, 8d: female screw Hole, 9: 2nd end plate (2nd plate material), 9a: recessed part, 9b: convex part, 9c: female screw hole, 9d: positioning hole, 10: 1st magnet cover (1st cover member), 11: 1st 2 magnet cover (second cover member), 11 g: through hole, 12: intermediate member, 13: nut, 14: bolt

Claims

A rotor core that holds a plurality of magnets extending in the axial direction in a manner of arranging them in the circumferential direction,
A first plate material that is in close contact with one end face in the axial direction of the rotor core,
A second plate material that comes into close contact with the other end surface of the rotor core in the axial direction is provided.
Each of the first plate material and the second plate material is a rotor provided with a plurality of recesses recessed from the outside to the inside in the radial direction in a circumferential direction.
The first plate material is arranged in such a posture that each of the plurality of the recessed portions is arranged in the radial direction with respect to the magnet held by the rotor core and is located outside in the radial direction.
The rotor is characterized in that the second plate material is arranged in such a posture that each of the plurality of the recessed portions is arranged in the radial direction with respect to the magnet held in the rotor core and is located outside in the radial direction. ..
A first cover member that is in close contact with at least an outer region in the radial direction of the first plate material and covers one side in the axial direction of each of the plurality of magnets in the entire area of the one side end surface of the rotor core. ,
A second cover member that is in close contact with at least an outer region in the radial direction of the second plate material and covers the other side in the axial direction of each of the plurality of magnets in the entire area of the other end surface of the rotor core. The rotor according to claim 1, wherein the rotor is provided with.
The thickness of the inner edge portion in the radial direction of each of the first cover member and the second cover member is thinner than the thickness of the outer edge portion.
The convex portion, which is a portion between the recessed portions adjacent to each other of the first plate material, and the inner edge portion of the first cover member are in close contact with each other in the axial direction.
The rotor according to claim 2, wherein the convex portion, which is a portion between the recessed portions adjacent to each other of the second plate material, and the inner edge portion of the second cover member are in close contact with each other in the axial direction.
The rotor according to claim 3, wherein each of the convex portion of the first plate material and the convex portion of the second plate material is curved with a curvature centered on the rotor rotation axis. ..
The inner edge portion of the first cover member is in close contact with the convex portion of the first plate material from one side in the axial direction.
The inner edge portion of the second cover member is in close contact with the convex portion of the second plate material from the other side in the axial direction.
A through-hole that penetrates in the axial direction is arranged at the inner edge portion of each of the first cover member and the second cover member.
A female screw through hole for screwing a male screw is arranged in the convex portion of each of the first plate material and the second plate material.
The rotor according to claim 3 or 4, wherein the male screw penetrating the through hole is screwed into the female screw through hole on one side and the other side in the axial direction, respectively.
The rotor core is provided with a plurality of through holes that penetrate in the axial direction.
A plurality of the through holes are arranged in such a manner that they are arranged in the circumferential direction.
The rotor according to claim 5, wherein the tip portion of the male screw penetrating the female screw through hole in each of the plurality of convex portions enters the through hole.
A rotary machine including a rotor that rotates around a rotation axis, a shaft that penetrates the center of the rotor, and a stator that surrounds the rotor along a circumferential direction centered on the rotation axis.
A rotating machine, wherein the rotor is the rotor according to any one of claims 1 to 6.