JP2022088992A - Rotor of rotary electric machine - Google Patents

Abstract

To efficiently dissipate heat generated from a magnetic material.SOLUTION: Since a first axis member 18 and a second axis member 19 have a second axis component member 32 having a higher thermal conductivity than a first axis component member 31, the heat generated from a permanent magnet 17 is easily transmitted to the second axis component member 32. Therefore, the heat generated from the permanent magnet 17 is efficiently dissipated as compared with a case in which the first axis member 18 and the second axis member 19 do not have the second axis component member 32.SELECTED DRAWING: Figure 2

Description

The present invention relates to a rotor of a rotary electric machine.

For example, as disclosed in Patent Document 1, the tubular member, the magnetic material arranged in the tubular member, and the tubular member project from at least one of both ends in the axial direction and are fixed to the inner peripheral surface of the tubular member. A rotor of a rotary electric machine is known to be provided with a shaft member capable of transmitting a driving force due to rotation. The magnetic material is covered inside the tubular member. The tubular member suppresses deformation of the magnetic material that receives centrifugal force due to the rotation of the rotor.

Japanese Unexamined Patent Publication No. 2004-1142849

By the way, in such a rotor of a rotary electric machine, when an eddy current is generated in a magnetic body, heat is generated in the magnetic body. At this time, since the magnetic material is covered with the tubular member, it is difficult for the heat generated from the magnetic material to be dissipated to the outside, and the heat is likely to be trapped inside the tubular member. When the temperature of the magnetic material becomes high, the magnetic material is thermally demagnetized, and the performance of the rotor may be deteriorated.

The rotor of the rotary electric machine that solves the above problems protrudes from at least one of the tubular member, the magnetic material arranged in the tubular member, and both ends of the tubular member in the axial direction, and the inner peripheral surface of the tubular member. It is a rotor of a rotary electric machine provided with a shaft member which is fixed to and can transmit a driving force due to rotation, and the shaft member has a higher thermal conductivity than the first shaft component and the first shaft component. It has a second shaft component having a high value.

According to this, since the shaft member has the second shaft component having a higher thermal conductivity than the first shaft component, the heat generated from the magnetic material is easily transferred to the second shaft component. Therefore, the heat generated from the magnetic material can be efficiently dissipated as compared with the case where the shaft member does not have the second shaft constituent member.

In the rotor of the rotary electric machine, the second shaft component may be in contact with the magnetic body.
According to this, since the second shaft component is in contact with the magnetic body, the heat generated from the magnetic body is transferred to the second shaft component. Here, since the second axis component has a higher thermal conductivity than the first axis component, the heat generated from the magnetic body is higher than, for example, when the magnetic material is in contact with only the first axis component. Is easily transmitted to the second shaft constituent member. Therefore, the heat generated from the magnetic material can be efficiently dissipated.

In the rotor of the rotary electric machine, the second shaft constituent member may be a columnar shape that extends through the inside of the first shaft constituent member on the axis of the tubular member and is in contact with the magnetic body.
According to this, when the heat generated from the magnetic material is concentrated near the axis of the tubular member, for example, the heat concentrated near the axis of the tubular member can be easily transferred to the second shaft constituent member. .. Therefore, it becomes easy to suppress the heat generated from the magnetic material from being trapped inside the tubular member, and the heat generated from the magnetic material can be efficiently dissipated.

In the rotor of the rotary electric machine, the second shaft constituent member has a flange portion protruding from the outer peripheral surface of the second shaft constituent member in a state of being adjacent to the magnetic body in the axial direction of the tubular member. The end face of the flange portion on the magnetic body side may be in contact with the magnetic body.

According to this, as compared with the configuration in which the second shaft constituent member does not have a flange portion, the contact area of the second shaft constituent member with the magnetic material can be increased, so that the heat generated from the magnetic material can be increased. It can be easily transmitted to the biaxial component. Therefore, the heat generated from the magnetic material can be dissipated more efficiently.

In the rotor of the rotary electric machine, the flange portion may be annular.
According to this, since the contact area of the flange portion with the magnetic material can be made as large as possible, the heat generated from the magnetic material can be further easily transferred to the second shaft constituent member. Therefore, the heat generated from the magnetic material can be dissipated more efficiently.

In the rotor of the rotary electric machine, it is preferable that the second shaft constituent member is formed with a through hole that penetrates the second shaft constituent member in the axial direction.
According to this, the heat transferred from the magnetic material to the second shaft component is dissipated to the inside of the through hole, so that the magnetic material is compared with the case where the through hole is not formed in the second shaft component. The heat generated from the magnetism can be dissipated more efficiently.

In the rotor of the rotary electric machine, the second shaft component may penetrate the magnetic material.
According to this, as compared with the case where the second shaft component does not penetrate the magnetic body, the contact area of the second shaft component with the magnetic body can be increased, so that the heat generated from the magnetic body can be increased. It can be easily transmitted to the biaxial component. Therefore, the heat generated from the magnetic material can be dissipated more efficiently.

In the rotor of the rotary electric machine, the tensile strength of the first shaft constituent member may be larger than the tensile strength of the second shaft constituent member.
Since the second axis component extends through the inside of the first axis component, the first axis component covers the second axis component. Since the tensile strength of the first shaft component covering the second shaft component is larger than the tensile strength of the second shaft component, the first shaft component receives centrifugal force due to the rotation of the rotor. Deformation of constituent members can be suppressed.

In the rotor of the rotary electric machine, the second shaft constituent member has a cylindrical shape that covers the periphery of the first shaft constituent member, and is provided at at least one of both ends of the tubular member in the axial direction and of the tubular member. It is preferable that the cylinder member is fixed to the inner peripheral surface of the cylinder member in a state of being adjacent to the magnetic material in the axial direction, and the end portion of the second shaft component member on the magnetic body side is in contact with the magnetic material.

According to this, when the heat generated from the magnetic material is dispersed toward the outer periphery of the tubular member, for example, the heat dispersed toward the outer periphery of the tubular member can be easily transferred to the second shaft constituent member. Can be done. Therefore, the heat generated from the magnetic material can be efficiently dissipated.

In the rotor of the rotary electric machine, the second shaft constituent member has a protruding portion protruding from the inner peripheral surface of the second shaft constituent member in a state of being adjacent to the magnetic body in the axial direction of the tubular member. The end face of the protruding portion on the magnetic body side may be in contact with the magnetic body.

According to this, as compared with the configuration in which the second shaft constituent member does not have a protruding portion, the contact area of the second shaft constituent member with the magnetic material can be increased, so that the heat generated from the magnetic material can be increased. It can be easily transmitted to the biaxial component. Therefore, the heat generated from the magnetic material can be dissipated more efficiently.

In the rotor of the rotary electric machine, the protruding portion may close the opening on the magnetic body side of the second shaft constituent member.
According to this, since the contact area of the protruding portion with the magnetic material can be made as large as possible, the heat generated from the magnetic material can be further easily transferred to the second shaft constituent member. Therefore, the heat generated from the magnetic material can be dissipated more efficiently.

According to the present invention, the heat generated from the magnetic material can be efficiently dissipated.

The sectional view for demonstrating the rotary electric machine in embodiment. A cross-sectional view showing a part of the rotor in an enlarged manner. FIG. 6 is an enlarged sectional view showing a part of a rotor according to another embodiment. FIG. 6 is an enlarged sectional view showing a part of a rotor according to another embodiment. FIG. 6 is an enlarged sectional view showing a part of a rotor according to another embodiment. FIG. 6 is an enlarged sectional view showing a part of a rotor according to another embodiment. FIG. 6 is an enlarged sectional view showing a part of a rotor according to another embodiment. FIG. 6 is an enlarged sectional view showing a part of a rotor according to another embodiment. FIG. 6 is an enlarged sectional view showing a part of a rotor according to another embodiment.

Hereinafter, an embodiment in which the rotor of the rotary electric machine is embodied will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, the rotary electric machine 10 is housed in a cylindrical housing 11. The housing 11 includes a first housing structure 12 and a second housing structure 13 connected to the first housing structure 12. The first housing structure 12 and the second housing structure 13 are made of metal, for example, aluminum.

The first housing structure 12 has a bottomed tubular shape having a plate-shaped bottom wall 12a and a peripheral wall 12b extending in a cylindrical shape from the outer peripheral portion of the bottom wall 12a. The second housing structure 13 has a plate shape. The second housing structure 13 is connected to the first housing structure 12 in a state where the opening on the peripheral wall 12b opposite to the bottom wall 12a is closed.

The first housing structure 12 has a cylindrical boss portion 12c. The boss portion 12c projects from the inner surface of the bottom wall 12a of the first housing structure 12. The axis of the boss portion 12c coincides with the axis of the peripheral wall 12b of the first housing structure 12. The second housing structure 13 has a cylindrical boss portion 13c. The boss portion 13c protrudes from the inner surface of the second housing structure 13. The axis of the boss portion 13c coincides with the axis of the peripheral wall 12b of the first housing structure 12. Therefore, the axes of both boss portions 12c and 13c are aligned.

The rotary electric machine 10 includes a stator 14 and a rotor 15. The stator 14 has a cylindrical stator core 14a and a coil 14b wound around the stator core 14a. The stator core 14a is fixed to the inner peripheral surface of the peripheral wall 12b of the first housing structure 12. The rotor 15 is arranged in the housing 11 so as to be rotatable inside the stator 14 in the radial direction.

As shown in FIG. 2, the rotor 15 includes a tubular member 16, a permanent magnet 17 which is a magnetic material, and a first shaft member 18 and a second shaft member 19 as shaft members. The tubular member 16 is made of, for example, an alloy material. The tubular member 16 has a cylindrical shape in which the axis of the tubular member 16 extends linearly.

The permanent magnet 17 is a solid columnar shape. The permanent magnet 17 is arranged in the tubular member 16. The axis of the permanent magnet 17 coincides with the axis of the tubular member 16. The permanent magnet 17 is magnetized in the radial direction of the permanent magnet 17. The axial length of the permanent magnet 17 is shorter than the axial length of the tubular member 16. The first end faces 17a and the second end faces 17b located on both sides of the permanent magnet 17 in the axial direction are flat surfaces extending in a direction orthogonal to the axial direction of the permanent magnet 17.

The first end surface 17a of the permanent magnet 17 is located inside the tubular member 16. Therefore, the first end portion 16a located on one side of the tubular member 16 in the axial direction protrudes in the axial direction from the first end surface 17a of the permanent magnet 17. Further, the second end surface 17b of the permanent magnet 17 is located inside the tubular member 16. Therefore, the second end portion 16b located on the other side in the axial direction of the tubular member 16 protrudes in the axial direction from the second end surface 17b of the permanent magnet 17.

The first shaft member 18 and the second shaft member 19 are provided at both ends of the tubular member 16 in the axial direction, respectively. The first shaft member 18 projects from the first end portion 16a of the tubular member 16 in a state of being fixed to the inner peripheral surface of the tubular member 16. The second shaft member 19 projects from the second end portion 16b of the tubular member 16 in a state of being fixed to the inner peripheral surface of the tubular member 16. Therefore, the rotor 15 of the present embodiment includes a shaft member that protrudes from both ends of the tubular member 16 in the axial direction and is fixed to the inner peripheral surface of the tubular member 16.

Next, a specific configuration of the first shaft member 18 will be described. Since the specific configuration of the second shaft member 19 is substantially the same as the configuration of the first shaft member 18, the same configuration as that of the first shaft member 18 is designated by the same reference numerals, and the overlapping description will be given. Omitted or abbreviated.

The first shaft member 18 includes a first shaft constituent member 31 and a second shaft constituent member 32. The first shaft component 31 has a cylindrical shape. The first shaft component 31 is made of, for example, stainless steel. The first shaft component 31 has a fixing portion 31a, a contact portion 31b, and a tubular portion 31c.

The fixing portion 31a has a cylindrical shape. The contact portion 31b is an annular shape that is continuous with the fixed portion 31a and has a larger outer diameter than the fixed portion 31a. The tubular portion 31c has a cylindrical shape continuous with the end portion of the contact portion 31b opposite to the fixed portion 31a. The outer diameter of the tubular portion 31c is the same as the outer diameter of the fixed portion 31a. The first shaft constituent member 31 is fixed to the inner peripheral surface of the tubular member 16, for example, by press-fitting the fixing portion 31a into the inside of the first end portion 16a of the tubular member 16. The fixing portion 31a is an end portion on the permanent magnet 17 side in the axial direction of the first shaft constituent member 31. The end portion of the tubular portion 31c opposite to the contact portion 31b is the end portion of the first shaft component 31 opposite to the permanent magnet 17 in the axial direction. The first shaft constituent member 31 of the second shaft member 19 is also fixed to the inner peripheral surface of the cylinder member 16, for example, by pressing the fixing portion 31a into the inside of the second end portion 16b of the cylinder member 16. ing. The axis of the first shaft component 31 of the first shaft member 18 and the axis of the first shaft component 31 of the second shaft member 19 coincide with the axis of the tubular member 16.

The first shaft member 18 and the second shaft member 19 are provided at both ends in the axial direction of the cylinder member 16 in a state where the axis of the first shaft member 18 and the axis of the second shaft member 19 coincide with the axis of the cylinder member 16. Each is provided. Therefore, the axis of the first shaft member 18 and the axis of the second shaft member 19 coincide with the axis of the permanent magnet 17.

The end surface 31d of the fixed portion 31a opposite to the contact portion 31b is a flat surface extending in a direction orthogonal to the axial direction of the first shaft component member 31. The direction orthogonal to the axial direction of the first shaft constituent member 31 is the radial direction of the first shaft constituent member 31. The end surface 31d of the fixed portion 31a is in surface contact with the first end surface 17a of the permanent magnet 17. The end face 31d of the fixing portion 31a of the first shaft constituent member 31 of the second shaft member 19 is also in surface contact with the second end face 17b of the permanent magnet 17. Further, the end surface 31e of the tubular portion 31c opposite to the contact portion 31b is a flat surface extending in the radial direction of the first shaft constituent member 31.

The end surface 31f on the fixing portion 31a side of the contact portion 31b is in contact with the first end portion 16a of the tubular member 16. The end surface 31f on the fixed portion 31a side of the contact portion 31b of the first shaft constituent member 31 of the second shaft member 19 is in contact with the second end portion 16b of the tubular member 16. Then, the contact of the tubular member 16 with the first end portion 16a on the end surface 31f of the contact portion 31b of the first shaft constituent member 31 of the first shaft member 18 and the contact of the first shaft constituent member 31 of the second shaft member 19 The axial movement of the tubular member 16 is restricted by the contact of the tubular member 16 with the second end portion 16b on the end surface 31f of the abutting portion 31b.

The second shaft component 32 is columnar. The second shaft component 32 is made of, for example, aluminum. Therefore, the second shaft constituent member 32 has a higher thermal conductivity than the first shaft constituent member 31. The tensile strength of the first shaft constituent member 31 is larger than the tensile strength of the second shaft constituent member 32. The second shaft component 32 is a non-magnetic material. The second shaft constituent member 32 is inserted inside the first shaft constituent member 31. Specifically, the second shaft constituent member 32 is press-fitted into the inner peripheral surface of the first shaft constituent member 31. The axis of the second axis component 32 coincides with the axis of the first axis component 31.

The end surface 32a on the permanent magnet 17 side of the second axis component 32 is located on the same plane as the end surface 31d of the fixed portion 31a of the first axis component 31. The end surface 32a of the second shaft component 32 is in surface contact with the first end surface 17a of the permanent magnet 17. Therefore, the second shaft component 32 is in contact with the permanent magnet 17. The end face 32a of the second shaft constituent member 32 of the second shaft member 19 is also in surface contact with the second end face 17b of the permanent magnet 17.

The end surface 32b of the second axis component 32 opposite to the permanent magnet 17 is located on the same surface as the end surface 31e of the tubular portion 31c of the first axis component 31. Therefore, the end surface 32b of the second shaft component 32 is exposed from the end surface 31e of the first shaft component 31. The second shaft constituent member 32 extends through the inside of the first shaft constituent member 31 on the axis of the tubular member 16. The first shaft constituent member 31 covers the second shaft constituent member 32.

As shown in FIG. 1, the first shaft member 18 passes through the inside of the boss portion 13c, penetrates the second housing structure 13, and projects out of the housing 11. A first bearing 21 is provided between the inner peripheral surface of the boss portion 13c and the outer peripheral surface of the first shaft member 18. The first shaft member 18 is supported by the boss portion 13c via the first bearing 21 so as to be rotatably supported by the housing 11.

A turbine 23 is attached to the end of the first shaft member 18 opposite to the permanent magnet 17. The turbine 23 can rotate integrally with the first shaft member 18. Therefore, the turbine 23 is driven by transmitting the rotation of the first shaft member 18 as a driving force. Therefore, the first shaft member 18 to which the turbine 23 is attached is a shaft member capable of transmitting the driving force due to rotation.

The second shaft member 19 is inserted inside the boss portion 12c. A second bearing 22 is provided between the inner peripheral surface of the boss portion 12c and the outer peripheral surface of the second shaft member 19. The second shaft member 19 is supported by the housing 11 in a rotatable state by the second shaft member 19 being supported by the boss portion 12c via the second bearing 22.

The second shaft member 19 is configured such that the end portion of the second shaft member 19 opposite to the permanent magnet 17 can be attached with a turbine. When the turbine is attached to the end of the second shaft member 19 on the opposite side of the permanent magnet 17, the turbine can rotate integrally with the second shaft member 19, and the rotation of the second shaft member 19 can occur. It is driven by being transmitted as a driving force. Therefore, the second shaft member 19 is a shaft member capable of transmitting the driving force due to rotation.

The second shaft component 32 of the first shaft member 18 extends from the permanent magnet 17 so as to pass through the inside of the first bearing 21. Therefore, the second shaft component 32 of the first shaft member 18 extends from at least a portion in contact with the permanent magnet 17 to a portion corresponding to the first bearing 21. The second shaft component 32 of the second shaft member 19 extends from the permanent magnet 17 to the inside of the second bearing 22. Therefore, the second shaft component 32 of the second shaft member 19 extends from at least a portion in contact with the permanent magnet 17 to a portion corresponding to the second bearing 22.

Next, the operation of this embodiment will be described.
In the rotor 15 having the above configuration, when electric power controlled by a drive circuit (not shown) is supplied to the coil 14b, the permanent magnet 17 tries to rotate, and the tubular member 16 integrally with the permanent magnet 17 via the permanent magnet 17. Rotate. Then, torque is transmitted from the cylinder member 16 to the first shaft member 18 at the fixed portion between the cylinder member 16 and the first shaft member 18, and torque is transmitted to the cylinder at the fixed portion between the cylinder member 16 and the second shaft member 19. It is transmitted from the member 16 to the second shaft member 19, and the first shaft member 18 and the second shaft member 19 rotate integrally. In this way, the tubular member 16, the first shaft member 18, the second shaft member 19, and the permanent magnet 17 rotate integrally.

By the way, in the rotor 15 of such a rotary electric machine 10, when an eddy current is generated in the permanent magnet 17, heat is generated in the permanent magnet 17. At this time, since the second shaft constituent member 32 is in contact with the permanent magnet 17, the heat generated from the permanent magnet 17 is transferred to the second shaft constituent member 32. Here, since the second axis component 32 has a higher thermal conductivity than the first axis component 31, for example, the permanent magnet 17 is in contact with only the first axis component 31 as compared with the case where the permanent magnet 17 is in contact with only the first axis component 31. The heat generated from 17 is easily transferred to the second shaft component 32. Therefore, the heat generated from the permanent magnet 17 is efficiently dissipated.

In the above embodiment, the following effects can be obtained.
(1) Since the first shaft member 18 and the second shaft member 19 have the second shaft component member 32 having a higher thermal conductivity than the first shaft component member 31, the heat generated from the permanent magnet 17 is generated. It is easily transmitted to the second shaft component 32. Therefore, the heat generated from the permanent magnet 17 can be efficiently dissipated as compared with the case where the first shaft member 18 and the second shaft member 19 do not have the second shaft component 32.

(2) Since the second shaft constituent member 32 is in contact with the permanent magnet 17, the heat generated from the permanent magnet 17 is transferred to the second shaft constituent member 32. Here, since the second axis component 32 has a higher thermal conductivity than the first axis component 31, for example, the permanent magnet 17 is in contact with only the first axis component 31 as compared with the case where the permanent magnet 17 is in contact with only the first axis component 31. The heat generated from 17 is easily transferred to the second shaft component 32. Therefore, the heat generated from the permanent magnet 17 can be efficiently dissipated.

(3) The second shaft constituent member 32 is a columnar shape that extends through the inside of the first shaft constituent member 31 on the axis of the tubular member 16 and is in contact with the permanent magnet 17. According to this, when the heat generated from the permanent magnet 17 is concentrated near the axis of the tubular member 16, for example, the heat concentrated near the axis of the tubular member 16 is easily transferred to the second shaft constituent member 32. can do. Therefore, it becomes easy to prevent the heat generated from the permanent magnet 17 from being trapped inside the tubular member 16, and the heat generated from the permanent magnet 17 can be efficiently dissipated.

(4) Since the tensile strength of the first shaft constituent member 31 covering the second shaft constituent member 32 is larger than the tensile strength of the second shaft constituent member 32, the first shaft constituent member 31 centrifuges due to the rotation of the rotor 15. Deformation of the second shaft constituent member 32 that receives a force can be suppressed.

(5) Since the end surface 32b of the second axis component 32 is exposed from the end surface 31e of the first axis component 31, the heat transferred from the permanent magnet 17 to the second axis component 32 is transferred to the second axis. The heat is radiated from the end surface 32b of the component 32 to the outside air. Therefore, the heat generated from the permanent magnet 17 can be dissipated more efficiently.

(6) Since the second axis component 32 is a non-magnetic material, magnetic flux leakage occurs from the permanent magnet 17 to the second axis component 32 even if the second axis component 32 is in contact with the permanent magnet 17. hard. Therefore, it is possible to prevent the performance of the rotor 15 from deteriorating.

(7) According to the present embodiment, since the heat generated from the permanent magnet 17 can be efficiently dissipated, it is possible to suppress the thermal demagnetization of the permanent magnet 17, and the performance of the rotor 15 is improved. It is possible to suppress the decrease.

(8) The second shaft component 32 of the first shaft member 18 extends from at least a portion in contact with the permanent magnet 17 to a portion corresponding to the first bearing 21. The second shaft component 32 of the second shaft member 19 extends from at least a portion in contact with the permanent magnet 17 to a portion corresponding to the second bearing 22. According to this, the heat transferred from the permanent magnet 17 to the second shaft component 32 is easily dissipated in the axial direction of each of the first shaft member 18 and the second shaft member 19, so that the heat generated from the permanent magnet 17 is generated. Can be dissipated more efficiently.

The above embodiment can be modified and implemented as follows. The above embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.

○ As shown in FIG. 3, the second shaft constituent member 32 has a flange portion 35 protruding from the outer peripheral surface of the second shaft constituent member 32 in a state of being adjacent to the permanent magnet 17 in the axial direction of the tubular member 16. May be. The flange portion 35 is annular. The flange portion 35 projects radially outward of the second shaft constituent member 32 from the end portion on the outer peripheral surface of the second shaft constituent member 32 on the permanent magnet 17 side. The end face 35a on the permanent magnet 17 side of the flange portion 35 is in contact with the permanent magnet 17. The end surface 35a of the flange portion 35 of the second shaft component 32 of the first shaft member 18 extends along the first end surface 17a of the permanent magnet 17 and is in surface contact with the first end surface 17a of the permanent magnet 17. Further, the end surface 35a of the flange portion 35 of the second shaft constituent member 32 of the second shaft member 19 also extends along the second end surface 17b of the permanent magnet 17 and comes into surface contact with the second end surface 17b of the permanent magnet 17. There is.

According to this, as compared with the configuration in which the second shaft constituent member 32 does not have the flange portion 35, the contact area of the second shaft constituent member 32 with the permanent magnet 17 can be increased, so that the permanent magnet 17 can be used. The generated heat can be easily transferred to the second shaft component 32. Therefore, the heat generated from the permanent magnet 17 can be dissipated more efficiently.

Further, the flange portion 35 is annular. According to this, since the contact area of the flange portion 35 with the permanent magnet 17 can be made as large as possible, the heat generated from the permanent magnet 17 can be further easily transferred to the second shaft constituent member 32. Therefore, the heat generated from the permanent magnet 17 can be dissipated more efficiently.

○ As shown in FIG. 4, the second shaft constituent member 32 may be formed with a through hole 36 that penetrates the second shaft constituent member 32 in the axial direction. The through hole 36 extends on the axis of the second shaft component 32. One end of the through hole 36 opens to the end surface 32a of the second shaft constituent member 32, and the other end of the through hole 36 opens to the end surface 32b of the second shaft constituent member 32.

According to this, the heat transferred from the permanent magnet 17 to the second shaft constituent member 32 is dissipated to the inside of the through hole 36, so that the through hole 36 is not formed in the second shaft constituent member 32. By comparison, the heat generated by the permanent magnet 17 can be dissipated more efficiently.

-In the embodiment shown in FIGS. 3 and 4, the flange portion 35 does not have to be annular, and for example, the flange portion may protrude from a part of the outer peripheral surface of the second shaft component 32 in the circumferential direction.

-In the embodiment shown in FIG. 4, the second shaft component 32 may not have the flange portion 35.
○ In the embodiment shown in FIG. 4, the through hole 36 may extend in the axial direction of the second shaft constituent member 32 at a position deviated from the axis of the second shaft constituent member 32.

○ As shown in FIG. 5, the second shaft component 32A may penetrate the permanent magnet 17. In the embodiment shown in FIG. 5, the second shaft component 32A penetrates the first shaft component 31 of the first shaft member 18, the permanent magnet 17, and the first shaft component 31 of the second shaft member 19. There is. The second shaft component 32A penetrates the axis of the permanent magnet 17. The outer peripheral surface of the second shaft component 32A is in contact with the permanent magnet 17. A through hole 36A is formed in the second shaft component 32A. The through hole 36A extends on the axis of the second shaft component 32A. One end of the through hole 36A opens to the end surface 321A of the second shaft constituent member 32A, and the other end of the through hole 36A opens to the end surface 322A of the second shaft constituent member 32A.

According to this, as compared with the case where the second axis component 32A does not penetrate the permanent magnet 17, the contact area of the second axis component 32A with the permanent magnet 17 can be increased, so that the permanent magnet 17 can be used. The generated heat can be easily transferred to the second shaft component 32A. Therefore, the heat generated from the permanent magnet 17 can be dissipated more efficiently.

○ In the embodiment shown in FIG. 5, the through hole 36A may not be formed in the second shaft constituent member 32A.
○ In the embodiment shown in FIG. 5, the second shaft component 32 may penetrate the permanent magnet 17 at a position deviated from the axis of the permanent magnet 17.

○ As shown in FIG. 6, the first shaft constituent member 41 may be cylindrical and the second shaft constituent member 42 may be cylindrical. The second shaft constituent member 42 covers the periphery of the first shaft constituent member 41. The second shaft component 42 has a fixing portion 42a, a contact portion 42b, and a tubular portion 42c.

The fixing portion 42a has a cylindrical shape. The contact portion 42b is an annular shape that is continuous with the fixed portion 42a and has a larger outer diameter than the fixed portion 42a. The tubular portion 42c has a cylindrical shape continuous with the end portion of the contact portion 42b opposite to the fixed portion 42a. The outer diameter of the tubular portion 42c is the same as the outer diameter of the fixed portion 42a. The second shaft constituent member 42 is fixed to the inner peripheral surface of the tubular member 16, for example, by press-fitting the fixing portion 42a into the inside of the first end portion 16a of the tubular member 16. The fixing portion 42a is an end portion on the permanent magnet 17 side in the axial direction of the second shaft constituent member 42. The end portion of the tubular portion 42c opposite to the contact portion 42b is the end portion of the second shaft component 42 opposite to the permanent magnet 17 in the axial direction. The second shaft constituent member 42 of the second shaft member 19 is also fixed to the inner peripheral surface of the cylinder member 16, for example, by pressing the fixing portion 42a into the inside of the second end portion 16b of the cylinder member 16. ing. The axis of the second shaft component 42 of the first shaft member 18 and the axis of the second shaft component 42 of the second shaft member 19 coincide with the axis of the tubular member 16.

The end surface 42d of the fixed portion 42a opposite to the abutting portion 42b is a flat surface extending in a direction orthogonal to the axial direction of the second shaft component 42. The end surface 42d of the fixed portion 42a is in surface contact with the first end surface 17a of the permanent magnet 17. The end face 42d of the fixing portion 42a of the second shaft constituent member 42 of the second shaft member 19 is also in surface contact with the second end face 17b of the permanent magnet 17. Further, the end surface 42e of the tubular portion 42c opposite to the contact portion 42b is a flat surface extending in the radial direction of the second shaft constituent member 42.

Therefore, the second shaft constituent member 42 is provided at both ends in the axial direction of the tubular member 16 and is fixed to the inner peripheral surface of the tubular member 16 in a state of being adjacent to the permanent magnet 17 in the axial direction of the tubular member 16. The end of the second shaft component 42 on the permanent magnet 17 side is in contact with the permanent magnet 17.

The end surface 42f on the fixing portion 42a side of the contact portion 42b is in contact with the first end portion 16a of the tubular member 16. The end surface 42f on the fixed portion 42a side of the contact portion 42b of the second shaft constituent member 42 of the second shaft member 19 is in contact with the second end portion 16b of the tubular member 16. Then, the contact of the tubular member 16 with the first end portion 16a on the end surface 42f of the contact portion 42b of the second shaft constituent member 42 of the first shaft member 18 and the contact of the second shaft constituent member 42 of the second shaft member 19 The axial movement of the tubular member 16 is restricted by the contact of the tubular member 16 with the second end portion 16b on the end surface 42f of the abutting portion 42b.

The first shaft constituent member 41 is inserted inside the second shaft constituent member 42. Specifically, the first shaft constituent member 41 is press-fitted into the inner peripheral surface of the second shaft constituent member 42. The axis of the first axis component 41 coincides with the axis of the second axis component 42.

The end surface 41a on the permanent magnet 17 side of the first axis component 41 is located on the same plane as the end surface 42d of the fixed portion 42a of the second axis component 42. The end surface 41a of the first shaft component 41 is in surface contact with the first end surface 17a of the permanent magnet 17. Therefore, the first shaft component 41 is in contact with the permanent magnet 17. The end face 41a of the first shaft constituent member 41 of the second shaft member 19 is also in surface contact with the second end face 17b of the permanent magnet 17.

The end surface 41b of the first axis component 41 opposite to the permanent magnet 17 is located on the same surface as the end surface 42e of the tubular portion 42c of the second axis component 42. Therefore, the end face 41b of the first shaft constituent member 41 is exposed from the end face 42e of the second shaft constituent member 42. The first shaft constituent member 41 extends through the inside of the second shaft constituent member 42 on the axis of the tubular member 16. The second shaft constituent member 42 covers the first shaft constituent member 41. The outer peripheral surface of the second shaft component 42 is exposed to the outside.

According to this, when the heat generated from the permanent magnet 17 is dispersed toward the outer periphery of the tubular member 16, for example, the heat dispersed toward the outer periphery of the tubular member 16 is transferred to the second shaft constituent member 42. Can be made easier. Therefore, the heat generated from the permanent magnet 17 can be efficiently dissipated.

Further, since the outer peripheral surface of the second shaft constituent member 42 is exposed to the outside, the heat transferred from the permanent magnet 17 to the second shaft constituent member 42 is dissipated from the outer peripheral surface of the second shaft constituent member 42 to the outside air. Will be done. Therefore, the heat generated from the permanent magnet 17 can be dissipated more efficiently.

○ As shown in FIG. 7, the second shaft constituent member 42 has a protruding portion 43 protruding from the inner peripheral surface of the second shaft constituent member 42 in a state of being adjacent to the permanent magnet 17 in the axial direction of the tubular member 16. You may be doing it. The protruding portion 43 has a disk shape. The protrusion 43 extends radially inward from the end on the inner peripheral surface of the second shaft component 42 on the permanent magnet 17 side. The protrusion 43 closes the opening on the permanent magnet 17 side of the second shaft component 42. The end face 43a on the permanent magnet 17 side of the protrusion 43 is in contact with the permanent magnet 17. The end surface 43a of the protruding portion 43 of the second axis constituent member 42 of the first shaft member 18 extends along the first end surface 17a of the permanent magnet 17 and is in surface contact with the first end surface 17a of the permanent magnet 17. Further, the end surface 43a of the protruding portion 43 of the second shaft component 42 of the second shaft member 19 also extends along the second end surface 17b of the permanent magnet 17 and comes into surface contact with the second end surface 17b of the permanent magnet 17. There is. Therefore, the end face 43a on the permanent magnet 17 side of the protrusion 43 is in contact with the permanent magnet 17.

According to this, as compared with the configuration in which the second shaft constituent member 42 does not have the protruding portion 43, the contact area of the second shaft constituent member 42 with the permanent magnet 17 can be increased, so that the permanent magnet 17 can be used. The generated heat can be easily transferred to the second shaft component 42. Therefore, the heat generated from the permanent magnet 17 can be dissipated more efficiently.

Further, the protruding portion 43 closes the opening on the permanent magnet 17 side in the second shaft component 42. According to this, since the contact area of the protruding portion 43 with the permanent magnet 17 can be made as large as possible, the heat generated from the permanent magnet 17 can be further easily transferred to the second shaft constituent member 42. Therefore, the heat generated from the permanent magnet 17 can be dissipated more efficiently.

○ In the embodiment shown in FIG. 7, the protrusion 43 does not have to close the opening on the permanent magnet 17 side of the second shaft component 42, for example, the circumference of the inner peripheral surface of the second shaft component 42. The protrusion may protrude from a part of the direction.

○ As shown in FIG. 8, the end surface 32b of the second shaft component 32 may not be exposed from the end surface 31e of the first shaft component 31. The first shaft constituent member 31 has a disk-shaped covering portion 31 g that covers the end surface 32b of the second shaft constituent member 32. The covering portion 31g projects inward in the radial direction of the first shaft constituent member 31 from the end portion on the inner peripheral surface of the first shaft constituent member 31 opposite to the permanent magnet 17. Therefore, in the embodiment shown in FIG. 8, the second shaft constituent member 32 does not penetrate the first shaft constituent member 31. As described above, even if the end surface 32b of the second axis component 32 is not exposed from the end surface 31e of the first axis component 31, the heat transferred from the permanent magnet 17 to the second axis component 32 is transmitted. Is transmitted from the second shaft constituent member 32 to the first shaft constituent member 31, and is radiated from the first shaft constituent member 31 to the outside air.

○ As shown in FIG. 9, the second shaft component 52 may be, for example, a plate shape. The second shaft component 42 has a disk shape. Further, the first shaft constituent member 51 may be columnar. The first shaft component 51 is cylindrical.

The first shaft component 51 has a fixing portion 51a, a contact portion 51b, and a tubular portion 51c. The fixed portion 51a is columnar. The contact portion 51b is an annular shape that is continuous with the fixed portion 51a and has a larger outer diameter than the fixed portion 51a. The tubular portion 51c has a cylindrical shape continuous with the end portion of the contact portion 51b on the opposite side of the fixed portion 51a. The outer diameter of the tubular portion 51c is the same as the outer diameter of the fixed portion 51a. The end surface 51d of the fixed portion 51a opposite to the contact portion 51b is a flat surface extending in a direction orthogonal to the axial direction of the first shaft component 51. The first shaft component 51 of the first shaft member 18 is fixed to the inner peripheral surface of the cylinder member 16, for example, by press-fitting the fixing portion 51a into the inside of the first end portion 16a of the cylinder member 16. .. The first shaft component 51 of the second shaft member 19 is also fixed to the inner peripheral surface of the cylinder member 16, for example, by pressing the fixing portion 51a into the inside of the second end portion 16b of the cylinder member 16. ing.

The outer diameter of the second shaft constituent member 52 is the same as the outer diameter of the fixed portion 51a of the first shaft constituent member 51. The second shaft constituent member 52 is arranged inside the tubular member 16. The thickness direction of the second shaft constituent member 52 coincides with the axial direction of the tubular member 16. The second shaft constituent member 52 of the first shaft member 18 is sandwiched between the end surface 51d of the fixing portion 51a and the first end surface 17a of the permanent magnet 17. The end surface 52a on the fixing portion 51a side of the second shaft component 52 is in surface contact with the end surface 51d of the fixing portion 51a. The end surface 52b on the permanent magnet 17 side of the second shaft component 52 is in surface contact with the first end surface 17a of the permanent magnet 17.

The second shaft component 52 of the second shaft member 19 is also sandwiched between the end surface 51d of the fixed portion 51a and the second end surface 17b of the permanent magnet 17, and the end surface 52a on the fixed portion 51a side of the second shaft component 52. Is in surface contact with the end surface 51d of the fixed portion 51a, and the end surface 52b on the permanent magnet 17 side of the second shaft component 52 is in surface contact with the second end surface 17b of the permanent magnet 17. Therefore, the second shaft component 52 is in contact with the permanent magnet 17.

Even with such a configuration, the heat transferred from the permanent magnet 17 to the second shaft constituent member 52 is transferred from the second shaft constituent member 52 to the first shaft constituent member 51, and the heat is transferred to the first shaft constituent member 51. The heat is dissipated from the outside air.

-In the embodiment shown in FIG. 9, the second shaft constituent member 52 does not have to be in the shape of a disk, and may be in the shape of a rectangular plate, for example. In short, the shape of the second shaft constituent member 52 is not particularly limited.

○ In the embodiment, the second shaft component 32 may not be in contact with the permanent magnet 17. For example, an adhesive or a lubricant may be interposed between the second shaft component 32 and the permanent magnet 17. Even in this case, the heat generated from the permanent magnet 17 is transferred to the second shaft component 32 via the adhesive or the lubricant. Therefore, when an adhesive or a lubricant is interposed between the second axis component 32 and the permanent magnet 17, the thickness of the adhesive or the lubricant is the second axis in the heat generated from the permanent magnet 17. The thickness needs to be such that the transmission to the component 32 is not hindered.

-In the embodiment, the second shaft component 32 may also be made of stainless steel. In this case, the first shaft constituent member 31 is made of, for example, austenitic stainless steel, and the second shaft constituent member 32 is made of stainless steel having a higher thermal conductivity than the first shaft constituent member 31.

○ In the embodiment, the material of the first shaft component 31 is not limited to stainless steel, and may be, for example, iron-based, titanium alloy, nickel alloy, or the like.
○ In the embodiment, the material of the second shaft constituent member 32 is not limited to aluminum, and may be, for example, a material having a relatively high thermal conductivity such as copper, silver, tungsten, iron, or carbon.

O In the embodiment, the tensile strength of the first shaft constituent member 31 may be the same as the tensile strength of the second shaft constituent member 32.
O In the embodiment, the tensile strength of the first shaft constituent member 31 may be smaller than the tensile strength of the second shaft constituent member 32.

○ In the embodiment, the magnetic material is not limited to the permanent magnet 17, and may be, for example, a laminated core, an amorphous core, a dust core, or the like.
○ In the embodiment, the rotor 15 may be configured not to be provided with the second shaft member 19, for example. Further, the rotor 15 is configured such that, for example, the second shaft member 19 is not provided, and the first shaft member 18 penetrates the permanent magnet 17 and protrudes from the second end portion 16b of the tubular member 16. There may be. In short, the rotor 15 may have a configuration in which the shaft member protrudes from at least one of both ends of the tubular member 16 in the axial direction. For example, even in the embodiment shown in FIG. 6, the second shaft constituent member 42 may be provided at at least one of both ends in the axial direction of the tubular member 16.

○ In the embodiment, the permanent magnet 17 may be, for example, a solid square columnar shape, and the shape of the permanent magnet 17 is not particularly limited. For example, when the permanent magnet 17 has a solid square columnar shape, the tubular member 16 needs to be formed in a square cylindrical shape. Therefore, the shape of the tubular member 16 may be appropriately changed depending on the shape of the permanent magnet 17.

○ In the embodiment, the tubular member 16 may be made of, for example, carbon fiber reinforced plastic. In short, the material of the tubular member 16 is not particularly limited.
○ In the embodiment, the first shaft constituent member 31 may have a configuration that does not have the contact portion 31b.

○ In the embodiment, for example, a turbine may be attached to an end portion of the second shaft member 19 opposite to the permanent magnet 17. In this case, the turbine can rotate integrally with the second shaft member 19, and is driven by transmitting the rotation of the second shaft member 19 as a driving force.

10 ... Rotating electric machine, 15 ... Rotor, 16 ... Cylinder member, 17 ... Permanent magnet which is a magnetic material, 18 ... First shaft member as a shaft member, 19 ... Second shaft member as a shaft member, 31, 41, 51 ... 1st shaft constituent member, 32, 32A, 42, 52 ... 2nd shaft constituent member, 35 ... Flange portion, 36, 36A ... Through hole, 43 ... Protruding portion.

Claims (11)

With the cylinder member
The magnetic material arranged in the tubular member and
A rotor of a rotary electric machine provided with a shaft member that protrudes from at least one of both ends in the axial direction of the cylinder member and is fixed to the inner peripheral surface of the cylinder member and can transmit a driving force due to rotation.
The shaft member is
1st axis component and
A rotor of a rotary electric machine, characterized by having a second shaft component having a higher thermal conductivity than the first shaft component. The rotor of a rotary electric machine according to claim 1, wherein the second shaft component is in contact with the magnetic body. 2. The rotor of the rotary electric machine described. The second shaft constituent member has a flange portion that protrudes from the outer peripheral surface of the second shaft constituent member in a state of being adjacent to the magnetic body in the axial direction of the tubular member.
The rotor of a rotary electric machine according to claim 3, wherein the end face of the flange portion on the magnetic body side is in contact with the magnetic body. The rotor of a rotary electric machine according to claim 4, wherein the flange portion is annular. The rotary electric machine according to any one of claims 3 to 5, wherein the second shaft constituent member is formed with a through hole that penetrates the second shaft constituent member in the axial direction. Rotor. The rotor of a rotary electric machine according to any one of claims 3 to 6, wherein the second shaft constituent member penetrates the magnetic material. The rotor of a rotary electric machine according to any one of claims 3 to 7, wherein the tensile strength of the first shaft constituent member is larger than the tensile strength of the second shaft constituent member. The second shaft constituent member has a tubular shape that covers the periphery of the first shaft constituent member, is provided at at least one of both ends of the tubular member in the axial direction, and is provided with the magnetic material in the axial direction of the tubular member. According to claim 1 or 2, the end portion of the second shaft component member on the magnetic body side is fixed to the inner peripheral surface of the tubular member in an adjacent state and is in contact with the magnetic body. The rotor of the rotary electric machine described. The second shaft constituent member has a protruding portion protruding from the inner peripheral surface of the second shaft constituent member in a state of being adjacent to the magnetic body in the axial direction of the tubular member.
The rotor of a rotary electric machine according to claim 9, wherein the end face of the protruding portion on the magnetic body side is in contact with the magnetic body. The rotor of a rotary electric machine according to claim 10, wherein the protruding portion closes an opening on the magnetic body side in the second shaft component member.

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