TWI571033B - Rotor for rotary electric machine and method for manufacture thereof - Google Patents

Description

Rotor of rotary electric machine and rotor of rotary electric machine

The present invention relates to a rotor for a rotating electrical machine in which permanent magnets are disposed on an outer circumferential surface of a core of a rotor, and a method of manufacturing a rotor for a rotating electrical machine.

In recent years, the demand for high efficiency, high output, and high rotational speed of rotary electric machines for industrial use, the expectation of energy saving due to resource depletion, the reduction of machining steps, or the difficulty The correspondence of the cutting process becomes very high.

Rotating motors can be divided into two types of "synchronous" and "inductive". The rotary motors for industrial use are usually inductive rotary motors that are strong and strong. However, in principle, the inductive rotating electrical machine has a current flowing in the rotor. Therefore, in order to increase the efficiency and increase the output, heat generation of the rotor due to the current becomes a problem. Therefore, the development of a synchronous rotating electrical machine for rotary motors for industrial use has been developed.

Since the synchronous rotating electrical machine uses a permanent magnet as the field magnet of the rotor, theoretically, the heat generation of the rotor does not occur, which is advantageous for the level of high efficiency and high output. However, in order to achieve a synchronous rotating electrical machine The practicality of high-speed rotation is necessary to solve the peeling of the permanent magnet caused by the centrifugal force during rotation.

On the other hand, in Patent Document 1, it is proposed to cover the outer peripheral surface of the cylindrical permanent magnet attached to the outer peripheral surface of the rotor shaft with a protective cover of a fiber-reinforced plastic, thereby suppressing the permanent force caused by the centrifugal force during the rotation. The structure of the peeling of the magnet.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] JP-A-8-107641

However, in the structure in which the outer peripheral surface of the permanent magnet is covered by the reinforcing member like a protective cover to suppress the peeling of the magnet, when a plurality of segmented magnets separated in the circumferential direction constitute the permanent magnet, the centrifugal force will be respectively along Radially applied to a plurality of split magnets. Therefore, the reinforcing member is in a position corresponding to the direction between the divided magnets in the circumferential direction, and the stress is concentrated at a position corresponding to the divided magnets. Therefore, the reinforcing member must be constructed to a corresponding amount using a member having a high strength considering the stress.

In addition, in the split magnet, slight unevenness occurs in the radial height depending on the dimensional accuracy or the assembly accuracy. When the reinforcing member is mounted in a state where the radial height of the split magnet is uneven, radial shear stress is applied to the reinforcing member, which corresponds to the diameter of the split magnet adjacent to each other. To the position of the end of the highly segmented magnet. Therefore, the protective cover must be constructed to a corresponding amount using a relatively higher strength member that takes into account the shear stress.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a rotor for a rotating electrical machine in which a permanent magnet attached to an outer circumferential surface of a core of a rotor is divided into a plurality of pieces in the circumferential direction and separated, and the reinforcing body can be easily reinforced. It is to suppress the peeling of the permanent magnet by the centrifugal force at the time of rotation.

In order to achieve the above object, a rotor of a rotating electrical machine according to the present invention includes: a cylindrical iron core; and a plurality of permanent magnets attached to an outer circumferential surface of the iron core and disposed apart from each other in a circumferential direction of the iron core; Filling a gap between the permanent magnets adjacent to each other in the circumferential direction, and attaching a plurality of first members to the outer peripheral surface of the iron core; forming at least a coating by a molten non-magnetic material a film of an outer peripheral surface of the plurality of permanent magnets; and a cylindrical second member disposed on an outer peripheral surface of the film covering the outer peripheral surfaces of the plurality of first members and the film, and the plurality of first members The outer peripheral surface is in contact with the inner peripheral surface of the second member or is in contact with the inner peripheral surface of the second member via the film.

According to the present invention, it is possible to provide an effect of providing a rotor of a rotating electrical machine capable of suppressing peeling of the permanent magnet by centrifugal force during rotation with easy reinforcement.

1, 1a, 1b, 1c, 1d, 1e‧‧‧ rotor

2‧‧‧Axis

3‧‧‧ iron core

4, 4a, 4b‧‧‧ permanent magnets

5, 5a, 5b, 5c‧‧‧ components

6‧‧‧core through hole

7, 7a‧‧ ‧ film

8‧‧‧Mapping device

9‧‧‧Reinforcing components

10a, 10b, 17a, 17b, 17c‧‧‧ centrifugal force

11a, 11b‧‧‧ stress

12, 15‧‧‧ part of the reinforcement component

13, 16‧‧‧ cracking

14‧‧‧ shear stress

20‧‧‧Cutting tools

30‧‧‧ gap

71‧‧‧ cutting chips

81‧‧‧Solid material

Fig. 1 is a longitudinal sectional view showing a rotor of a rotary electric machine of an embodiment.

Fig. 2 is a cross-sectional view showing the rotor of the rotary electric machine of the embodiment.

Fig. 3 is a longitudinal cross-sectional view showing the configuration of a rotor before forming a film in an embodiment.

Fig. 4 is a cross-sectional view showing the configuration of a rotor before forming a film in an embodiment.

Fig. 5 is a schematic view showing the process of the film in the embodiment.

Fig. 6 is a cross-sectional view showing the configuration of a rotor in which a film has been formed in an embodiment.

Fig. 7 is a view showing a state in which stress is generated when the rotor rotates in the embodiment.

Fig. 8 is a view showing a state in which stress is generated when a rotor of a plurality of members and a film is removed in the embodiment.

Fig. 9 is another schematic view showing the state of stress generation when the rotor of a plurality of members and the film is removed in the embodiment.

Fig. 10 is a schematic view showing the process of the rotor of the rotary electric machine of the embodiment.

Fig. 11 is a schematic view showing a state in which the outer peripheral surface of the rotor is subjected to a cutting process by a cutting tool after forming a film by a spray device in an embodiment.

Fig. 12 is a cross-sectional view showing the rotor of the rotary electric machine according to the first modification of the embodiment.

Fig. 13 is a cross-sectional view showing the rotor of the rotary electric machine of the second modification of the embodiment.

Hereinafter, a method of manufacturing a rotor of a rotating electrical machine and a rotor of a rotating electrical machine according to an embodiment of the present invention will be described in detail based on the drawings. However, the invention is not limited by this embodiment.

Implementation type

Fig. 1 is a longitudinal sectional view of a rotor 1 of a rotating electrical machine of the present embodiment, and Fig. 2 is a transverse sectional view of a rotor 1 of a rotating electrical machine of the present embodiment. Here, the longitudinal cross-sectional view shown in FIG. 1 is a cross-sectional view including a cross section of the rotation center axis A of the rotor 1. In addition, the cross-sectional view shown in Fig. 2 is a cross-sectional view taken along a line perpendicular to the central axis A of rotation, and specifically, is a cross-sectional view taken along line I-I shown in Fig. 1. Moreover, the longitudinal cross-sectional view shown in Fig. 1 is specifically a cross-sectional view taken along line II-II shown in Fig. 2 .

As shown in FIG. 1 and FIG. 2, the rotor 1 includes a cylindrical iron core 3, and a plurality of permanent magnets 4 attached to the outer circumference of the iron core 3 and separated in the circumferential direction of the iron core 3; a member 5 filled in a gap between the permanent magnets 4 adjacent to each other in the circumferential direction, and attached to the outer peripheral surface of the core 3 as a plurality of first members; formed of a molten non-magnetic material and covered in plural The film 7 of the outer peripheral surface of the permanent magnet 4; and the reinforcing member 9 which is disposed on the outer peripheral surface of the plurality of members 5 and the film 7 and covers the outer peripheral surface of the plurality of members 5 and the film 7 as a cylindrical second member. Thus, the rotor 1 is a surface permanent magnet (SPM Surface Permanent) Magnet of the type of synchronous rotating electrical machine.

The iron core 3 is formed by laminating a plurality of laminated sheets of annular thin plates punched out from the electromagnetic steel sheets in the direction of the rotation center axis A, a cylindrical steel pipe, a pressed iron core, or the like. The core 3 has a core through hole 6 penetrating the core 3 in the direction of the rotation center axis A. The shaft 2 is fixed to the core 3 through the core through hole 6 . The iron core 3 is coaxial with the center axis A of rotation. In the following description, the direction of the rotation center axis A is simply referred to as "axial direction".

The plurality of permanent magnets 4 are divided into the outer circumferential surface of the iron core 3 in the circumferential direction of the iron core 3, and are disposed apart from each other in the circumferential direction. Here, the circumferential direction is also the direction of rotation of the rotor 1. A plurality of permanent magnets 4 are attached to the outer peripheral surface of the iron core 3 by an adhesive, respectively. In the example shown in the figure, four permanent magnets 4 are arranged at equal intervals in the circumferential direction. The plurality of permanent magnets 4 are alternately formed in the circumferential direction to form a magnetic N pole and an S pole. Further, in the example shown in the figure, the cross-sectional shape of the permanent magnet 4 is a shape cut out from a ring centered on the rotation center axis A at a constant angle range. In other words, the permanent magnet 4 has an arc shape having an inner center angle and an outer circumference, and has a constant height in the radial direction of the iron core 3. Further, the longitudinal cross-sectional shape of the permanent magnet 4 is a rectangle. The axial length of the permanent magnet 4 is shorter than the axial length of the core 3. The permanent magnet 4 is a rare earth magnet or a ferrite magnet.

A plurality of members 5 are arranged on the outer circumferential surface of the iron core 3 in the circumferential direction of the iron core 3. A plurality of members 5 are attached to the outer peripheral surface of the core 3 by an adhesive, respectively. The members 5 are disposed between the permanent magnets 4, that is, disposed between the magnetic poles. The number of members 5 and the number of permanent magnets 4 the same. In the example shown in the figure, four members 5 are arranged at equal intervals in the circumferential direction. Further, in the example shown in the figure, the cross-sectional shape of the member 5 is a shape cut out from a ring centered on the rotation center axis A at a constant angular range. That is, the member 5 has an arc shape having an inner center angle and an outer circumference, and has a constant height in the radial direction of the iron core 3. Here, the radial height of the member 5 from the outer peripheral surface of the core 3 to the core 3 is larger than the radial height of the permanent magnet 4 from the outer peripheral surface of the core 3 to the core 3. Further, the longitudinal cross-sectional shape of the member 5 is a rectangle. The axial length of the member 5 is the same as the axial length of the permanent magnet 4 and shorter than the axial length of the core 3.

The member 5 as the first member is formed of a non-magnetic material. Specifically, the member 5 is formed of stainless steel, an aluminum alloy, a copper alloy, an iron alloy, or a resin.

The film 7 is coated on the outer peripheral surface of the plurality of permanent magnets 4. That is, the film 7 is formed on each of the outer peripheral faces of the plurality of permanent magnets 4. The film 7 is used to eliminate the coating of the step formed between the outer peripheral surface of the member 5 and the outer peripheral surface of the permanent magnet 4. As a result, the outer peripheral surface of the plurality of coatings 7 and the outer peripheral surface of the plurality of members 5 are flush with each other to form an outer peripheral surface of the same cylinder. In the example shown in the figure, the film 7 is formed in four numbers corresponding to the number of the permanent magnets 4.

The film 7 is formed by spraying a non-magnetic material. Further, the film 7 is formed of a material having a conductivity equal to or less than that of the permanent magnet 4. Specifically, the non-magnetic material is an aluminum alloy, a copper alloy, or a ceramics, and the conductivity of the film 7 is set to be not more than the conductivity of copper, specifically, 5.6 × 10 ⁷ [S/m] or less. Further, in consideration of maintaining the strength of the film 7 and the bonding between the members, the film thickness of the film 7 is set to be between 0.3 mm and 3 mm. Here, the bonding between the members refers to the bonding between the film 7 and the permanent magnet 4 or the bonding between the film 7 and the member 5.

The reinforcing member 9 as the second member is disposed coaxially with the core 3, and is disposed on the outer peripheral surfaces of the plurality of members 5 and 7 to cover the outer peripheral surfaces of the plurality of members 5 and the film 7. Here, the inner peripheral surface of the reinforcing member 9 is in contact with the outer peripheral surfaces of the plurality of members 5 and the film 7 over the entire circumference. In particular, the outer peripheral surface of the member 5 is in contact with the inner peripheral surface of the reinforcing member 9. The reinforcing member 9 has an annular cross section, and the outer peripheral shape of the plurality of members 5 and 7 is circular, and the radius of the inner circumference of the reinforcing member 9 is equal to the radius of the outer circumference of the plurality of members 5 and 7 .

The reinforcing member 9 is formed of a so-called highly rigid non-magnetic material. Specifically, the reinforcing member 9 is formed of Carbon Fiber Reinforced Plastics (CFRP), Glass Fiber Reinforced Plastics (GFRP), titanium or stainless steel. Here, the stainless steel is austenitic stainless steel. When the reinforcing member 9 is formed of CFRP or GFRP, the fiber bundle of CFRP or GFRP is directly wound around the rotor 1b on which the film 7 has been formed (refer to Fig. 5), or the tape-like fibers of CFRP or GFRP are directly It is wound around the rotor 1b (refer to FIG. 5), thereby forming the reinforcing member 9.

Next, a method of manufacturing the rotor 1 will be described with reference to Figs. 3 to 6 . Fig. 3 is a longitudinal sectional view showing the configuration of the rotor 1a of the rotor 1 before the formation of the coating film 7 in the present embodiment, and Fig. 4 is a view showing the rotor 1a of the rotor 1 before the formation of the coating film 7 in the present embodiment. Cross section Figure. Here, the longitudinal cross-sectional view shown in FIG. 3 is a cross-sectional view including a cross section of the rotation center axis A. In addition, the cross-sectional view shown in Fig. 4 is a cross-sectional view taken along a line perpendicular to the central axis A of rotation, and specifically, a cross-sectional view taken along line III-III shown in Fig. 3. Moreover, the longitudinal cross-sectional view shown in Fig. 3 is specifically a cross-sectional view taken along line IV-IV shown in Fig. 4. Fig. 5 is a schematic view showing the process of the film 7 in the present embodiment, and Fig. 6 is a cross-sectional view showing the configuration of the rotor 1b of the rotor 1 in which the film 7 has been formed in the present embodiment. Further, the cross-sectional view shown in Fig. 6 is a cross-sectional view taken along a line perpendicular to the central axis A of rotation, specifically, a cross-sectional view taken along the line V-V shown in Fig. 5. Moreover, the longitudinal cross-sectional view of the rotor 1b shown in Fig. 5 is specifically a cross-sectional view taken along line VI-VI of Fig. 6. In the third to sixth embodiments, the same constituent elements as those of the first embodiment and the second embodiment are denoted by the same reference numerals.

First, as shown in Figs. 3 and 4, the rotor 1a is manufactured. That is, a plurality of permanent magnets 4 and a plurality of members 5 are attached to the outer peripheral surface of the core 3. At this time, the members 5 are arranged to be filled in a gap between the permanent magnets 4 adjacent in the circumferential direction. Further, the shaft 2 is passed through the core through hole 6 to fix the shaft 2 to the iron core 3. The fixing of the shaft 2 to the iron core 3 can be performed before the attachment of the permanent magnet 4, or after the attachment of the permanent magnet 4. The shaft 2 is fixed to the core 3 by any method of pressing, heat fitting, or cold fitting.

Next, as shown in Fig. 5, the film 7 is formed by the spray device 8. The film 7 is coated with the outer peripheral surfaces of the plurality of permanent magnets 4, respectively. Further, as shown in Fig. 6, the outer peripheral surface of the plurality of members 5 and the outer peripheral surface of the coating 7 form a cylindrical outer peripheral surface.

The spray device 8 is an arc spray device. However, the spray device 8 can also be a spray device other than the arc spray device. That is, the spraying method used in the present embodiment is not limited to arc spraying. The molten material 81 sprayed from the spray device 8 is an aluminum alloy, a copper alloy or a ceramic, and the conductivity of the melted material 81 after the melt is set to 5.6 × 10 ⁷ [S/m] or less.

The spray device 8 is disposed such that the tip end faces the rotation center axis A, and the melted material 81 is sprayed from the tip end to the outer peripheral surface of the permanent magnet 4. At this time, the rotor 1b is cooled by the cooling air, and the operation is performed while suppressing the temperature rise of the rotor 1b. Further, the spray device 8 can spray the spray material 81 by changing the posture from a state perpendicular to the rotation center axis A to a state parallel to the state. In Fig. 5, the angle of the spray between the line parallel to the central axis A of rotation and the axis of the spray device 8 is indicated by θ. In the example shown in the figure, the spray angle θ is 90°. Further, the spray device 8 is rotatable about the circumference of the rotation center axis A. When the spray material 81 is sprayed from the spray device 8, the spray coating angle θ is adjusted and the spray device 8 is rotationally moved around the rotation center axis A to form the outer peripheral surface of the plurality of permanent magnets 4. A certain film thickness 7 is required. Further, the rotor 1b may be rotated around the rotation center axis A instead of rotating the spray device 8 around the rotation center axis A. In this manner, the film 7 is coated on the outer peripheral surface of the plurality of permanent magnets 4.

As described above, as shown in Fig. 6, the film 7 is formed on the rotor 1b. At this time, the outer peripheral surface of the rotor 1b is cylindrical, and there is no unevenness.

Next, as shown in Figure 2, in a plurality of components 5 and skin A cylindrical reinforcing member 9 is attached to the outer peripheral surface of the film 7. The reinforcing member 9 is disposed on the outer peripheral surface of the plurality of members 5 and the film 7 by pressing, heat fitting, or cold fitting to the rotor 1b (see FIG. 5) on which the film 7 has been formed. Further, after the reinforcing member 9 is disposed on the outer peripheral surfaces of the plurality of members 5 and the film 7, the shaft 2 is attached to the core 3 by pressing, heat fitting, or cold fitting, from the inner circumference of the core 3 The face side expands the core 3 in the radial direction, thereby imparting a fastening force to the bond between the core 3 and the reinforcing member 9 to make the bond stronger. Further, depending on the material of the reinforcing member 9, the reinforcing member 9 can be directly wound around the rotor 1b on which the film 7 has been formed (see FIG. 5), and is disposed on the outer peripheral surfaces of the plurality of members 5 and the film 7.

Next, the effects of the present embodiment will be described with reference to Figs. 1, 2, 5, and 7. Fig. 7 is a view showing a state in which stress is generated when the rotor 1 rotates in the present embodiment.

The rotor 1 and the stator (not shown) constitute a synchronous rotating electrical machine including an inverter (not shown) that supplies a current to the stator coil. The rotor 1 is subjected to a torque due to a rotating magnetic field generated from the stator coil, and rotates around the rotation center axis A. The plurality of permanent magnets 4 attached to the outer peripheral surface of the core 3 are subjected to centrifugal force in accordance with the rotation of the rotor 1. However, the reinforcing member 9 is supported, so that peeling from the core 3 can be suppressed.

Here, in the rotor 1, the gap-filling member 5 between the permanent magnets 4 adjacent to each other in the circumferential direction, the outer peripheral surface of the permanent magnet 4 is covered with the coating 7, and the reinforcing member 9 is attached to the cylindrical rotor 1b. The outer perimeter. When the rotor 1 thus constructed is rotated, it occurs in the permanent magnet 4 Both the heart force and the centrifugal force occurring in the member 5 are applied to the reinforcing member 9. In particular, when the specific gravity of the permanent magnet 4 is equal to the specific gravity of the member 5, the same centrifugal force is applied to the reinforcing member 9. Accordingly, since the concentrated stress is not applied to the reinforcing member 9, the reinforcing member 9 is not broken, and the permanent magnet 4 can be held by the reinforcing member 9. This will be specifically described with reference to Fig. 7.

Fig. 7 shows a part of the cross section of the rotor 1, specifically, the iron core 3, the permanent magnets 4a, 4b, the members 5a to 5c, the coatings 7a, 7b, and the reinforcing member 9. The permanent magnets 4a, 4b display two of the plurality of permanent magnets 4 by symbols, and the members 5a to 5c display three of the plurality of members 5 by symbol, and the film 7a displays the film 7 by symbol. In the portion formed on the outer peripheral surface of the permanent magnet 4a, the film 7b is indicated by a symbol to show a portion of the film 7 formed on the outer peripheral surface of the permanent magnet 4b. Further, the specific gravity of the members 5a to 5c is equal to the specific gravity of the permanent magnets 4a, 4b. The centrifugal force 17a occurring in the member 5a, the centrifugal force 10a occurring in the permanent magnet 4a, the centrifugal force 17b occurring in the member 5b, the centrifugal force 10b occurring in the permanent magnet 4b, and the member are generated by the example structure as shown in the figure. The centrifugal force 17c of 5c is equally applied to the reinforcing member 9.

On the other hand, Fig. 8 is a schematic view showing a state in which stress is generated when the rotor of the plurality of members 5 and the film 7 is rotated in the present embodiment. As shown in Fig. 8, when the gap 30 exists between the permanent magnets 4a and 4b, the centrifugal forces 10a and 10b are applied to the permanent magnets 4a and 4b, respectively, but the centrifugal force is not applied to the gap 30. Therefore, the stresses 11a, 11b The centrifugal force 10a, 10b is applied to a portion 12 of the reinforcing member 9 that faces the gap 30 in a direction opposite to the circumferential direction. As such, when the member 5 is not present, the stress is concentrated on a portion 12 of the reinforcing member 9. Therefore, there is a case where the portion 13 of the reinforcing member 9 is cracked 13 and the reinforcing member 9 is broken.

In addition, Fig. 9 is another schematic view showing a state in which stress is generated when the rotor of the plurality of members 5 and the film 7 is rotated in the present embodiment. Specifically, the case where the radial height of the permanent magnet 4 is uneven is displayed. Further, in Fig. 9, in order to clearly show the difference in the radial height between the permanent magnets 4a and 4b, the circumferential direction of the core 3 is schematically shown as a lateral direction, and the radial direction of the core 3 is schematically shown as a longitudinal direction. In Fig. 9, the radial height of the permanent magnet 4a is larger than the radial height of the permanent magnet 4b. When the radial heights of the permanent magnets 4a and 4b are different, when the reinforcing member 9 is attached to the outer peripheral surfaces of the permanent magnets 4a and 4b, the concentrated stress is applied to the reinforcing member 9 corresponding to the end position of the permanent magnet 4a. Part of the location of 15. That is, at the time of rotation, due to the centrifugal force generated in the permanent magnet 4a, the shear stress 14 of the radial stress is generated in a portion 15 of the reinforcing member 9. As a result, the portion 16 of the reinforcing member 9 may be cracked 16 and the reinforcing member 9 may be damaged.

As described above, the rotor 1 includes a cylindrical core 3 and a plurality of permanent magnets 4 attached to the outer circumference of the core 3 and spaced apart from each other in the circumferential direction of the core 3, and are buried in the circumferential direction. a gap between the adjacent permanent magnets 4, and a plurality of members 5 attached to the outer peripheral surface of the core 3; formed of a molten non-magnetic material and coated on the plurality of permanent magnets 4 a film 7 on the outer peripheral surface; and a cylindrical reinforcing member 9 disposed on the outer peripheral surface of the plurality of members 5 and the film 7 and covering the outer peripheral surfaces of the plurality of members 5 and 7 .

In addition, the manufacturing method of the rotor 1 includes a process of attaching a plurality of permanent magnets 4 to the outer peripheral surface of the cylindrical iron core 3 in the circumferential direction of the iron core 3, and attaching the outer peripheral surfaces of the iron core 3 to the outer peripheral surface of the iron core 3 a process of filling a plurality of members 5 in a gap between the permanent magnets 4 adjacent to each other in the circumferential direction; a process of forming a non-magnetic material to form a film 7 coated on the outer peripheral surface of the plurality of permanent magnets 4; A process of arranging the cylindrical reinforcing members 9 covering the outer peripheral surfaces of the plurality of members 5 and the film 7 on the outer peripheral surface of the member 5 and the film 7 is disposed.

According to the present embodiment, since the concentrated stress on the reinforcing member 9 can be suppressed, it is not necessary to select the material and the amount of the reinforcing member 9 in consideration of stress concentration as before, and therefore, the rotation of the rotor 1 can be suppressed by easy reinforcement. The peeling of the permanent magnet 4 caused by the centrifugal force at the time. Further, since the reinforcing member 9 does not have to select a high-strength member as before and can also reduce the amount of use of the member, cost reduction can be achieved.

Further, even if the gap between the permanent magnets 4 is filled in the member 5, a gap may occur between the permanent magnet 4 and the member 5. However, if the gap is suppressed to a width of 2 mm or less in the circumferential direction, Get more results. In addition, when the irregularities in the radial direction of the outer peripheral surface of the plurality of members 5 and the film 7 are suppressed to 0.5 mm or less, a larger effect can be obtained.

In this embodiment, the member 5 is formed of a non-magnetic material. to make. Specifically, the member 5 is formed of stainless steel, an aluminum alloy, a copper alloy, an iron alloy, or a resin. Since the member 5 is formed of a non-magnetic material, the magnetic flux short-circuit loss in the iron core 3 and the inside of the member 5 can be suppressed. Further, the member 5 may be formed of a material other than a non-magnetic material.

Further, the member 5 may be selected in such a manner that its specific gravity is equal to the specific gravity of the permanent magnet 4. Thereby, since the centrifugal force in the member 5 and the permanent magnet 4 can be equalized, the stress concentration on the part of the reinforcing member 9 can be suppressed. Moreover, even if the specific gravity of the member 5 and the specific gravity of the permanent magnet 4 are not equal, the same effect can be obtained as the specific gravity of the member 5 is closer to the specific gravity of the permanent magnet 4.

In the present embodiment, the film 7 is formed by spraying a non-magnetic material. Specifically, the film 7 is formed of an aluminum alloy, a copper alloy, or a ceramic. Since the film 7 is formed of a non-magnetic material, it is possible to suppress the high harmonic loss occurring in the film 7 when the rotor 1 is driven by the above-described inverter.

Further, the film 7 is formed of a material having a conductivity equal to or less than that of copper. Thereby, the high harmonic loss occurring when the rotor 1 is driven by the above-described inverter in the film 7 can be suppressed.

In the present embodiment, the reinforcing member 9 is formed of a non-magnetic material. Specifically, the reinforcing member 9 is formed of carbon fiber reinforced plastic, glass fiber reinforced plastic, titanium, or stainless steel. Thereby, it is possible to suppress a decrease in the output of the rotary electric machine due to the leakage magnetic flux.

In the present embodiment, the film 7 is formed on the outer peripheral surface of the plurality of permanent magnets 4 and is not formed on the outer peripheral surface of the plurality of members 5. Thereby, the damage of the film 1 by the centrifugal force at the time of rotation of the rotor 1 can be suppressed.

Further, the film 7 can be formed before the shaft 2 is fixed to the core 3. Fig. 10 is another schematic view showing the process of the rotor of the rotary electric machine of the present embodiment. Fig. 10 is a view schematically showing a process of forming the film 7 by using the spray device 8 in the same manner as in Fig. 5, and the same components as those of the components shown in Fig. 5 are denoted by the same reference numerals. In Fig. 10, the shaft 2 is not inserted into the core through hole 6 of the rotor 1c, and the core through hole 6 is in a hollow state. However, in this case, similarly to the case of Fig. 5, the spray device 8 can be used. Film 7. The shaft 2 is inserted into the core through hole 6 after the formation of the film 7.

Moreover, in order to improve the effect of suppressing the concentrated stress on the reinforcing member 9, by processing the outer peripheral surface of the rotor 1b, the outer peripheral shape of the rotor 1 can be made closer to a circular shape and has a shape with less unevenness. Fig. 11 is a view showing a state in which the outer peripheral surface of the rotor 1b is subjected to a cutting process by the cutting tool 20 after the film 7 is formed by the spray device 8 in the present embodiment. In the eleventh diagram, the outer peripheral surface of the film 7 and the member 5 is cut by the cutting tool 20 in a state where the rotor 1b is rotated around the rotation center axis A, and the shavings 71 including the film 7 and the member 5 are removed. The rotor 1b is machined so that the outer peripheral shape of the rotor 1b is close to a perfect circle. Usually, the permanent magnet 4 is a rare earth magnet or a ferrite iron magnet. These magnets are very difficult to cut, and it is not possible to use a general-purpose machine during the cutting process. However, in the present embodiment, since the outer peripheral surface of the permanent magnet 4 is covered with the film 7, the film 7 can be subjected to a cutting process. Thereby, the outer peripheral shape of the rotor 1b can be made close to a perfect circle by general machining. Moreover, the so-called general-purpose machining here refers to cutting, grinding, and polishing. machining.

Further, the shapes of the permanent magnets 4 and the members 5 shown in Figs. 1 and 2 are merely examples and are not limited to the examples shown in the drawings. The cross-sectional shape of the permanent magnet 4 and the member 5 may be an arcuate or zigzag shape having a varying radial thickness. Further, each of the permanent magnets 4 may be composed of a plurality of magnets divided in the axial direction.

In addition, the mounting method of the member 5 shown in FIG. 3 and FIG. 4 is only an example and is not limited to the example shown in the figure. The member 5 may be filled with a gap between the permanent magnets 4, and after the reinforcing member 9 is attached to the film 7 coated on the outer peripheral surface of the permanent magnet 4, the member 5 may be inserted into the gap between the permanent magnets 4, and then The agent is attached to the outer peripheral surface of the iron core 3. Alternatively, when the member 5 is formed of a resin, the reinforcing member 9 may be attached to the film 7 coated on the outer peripheral surface of the permanent magnet 4, and then the resin may be injected into the gap between the permanent magnets 4 to form the member 5.

Further, according to the present embodiment, a rotary electric machine including the rotor 1 and an electric machine including the rotary electric machine can be provided.

Further, in the present embodiment, the film 7 is coated only on the outer peripheral surface of the plurality of permanent magnets 4, but the film 7 may be formed to cover the outer peripheral surface of the plurality of members 5. Fig. 12 is a cross-sectional view showing the rotor 1d of the rotary electric machine according to the first modification of the embodiment. The cross-sectional view shown in Fig. 12 corresponds to the cross-sectional view shown in Fig. 2. In Fig. 12, the same components as those shown in Fig. 2 are denoted by the same reference numerals.

As shown in Fig. 12, the rotor 1d is provided with a cylindrical iron core 3, and is attached to the outer circumference of the iron core 3, and is separated in the circumferential direction of the iron core 3. a plurality of permanent magnets 4 disposed; a gap filled between the permanent magnets 4 adjacent to each other in the circumferential direction, and a plurality of members 5 attached to the outer peripheral surface of the core 3; formed of a molten non-magnetic material A film 7 covering the outer peripheral surfaces of the plurality of permanent magnets 4 and the plurality of members 5; and a cylindrical reinforcing member 9 disposed on the outer peripheral surface of the film 7 and covering the outer peripheral surfaces of the plurality of members 5 and 7 . As described above, in the rotor 1d, the film 7 is covered not only on the outer peripheral surface of the plurality of permanent magnets 4 but also on the outer peripheral surface of the plurality of members 5. That is, the film 7 is formed on the outer peripheral surfaces of the plurality of permanent magnets 4 and the plurality of members 5. At this time, among the inner peripheral surfaces of the reinforcing members 9, the portion facing the member 5 is in contact with the outer peripheral surface of the coating 7. In other words, the member 5 is in contact with the inner peripheral surface of the reinforcing member 9 via the film 7 .

Thereby, the outer peripheral shape of the film 7 is made closer to a circle and has a shape with less unevenness, and the concentrated stress on the reinforcing member 9 when the rotor 1d is rotated can be suppressed. Further, in the example shown in the figure, the radial height of the member 5 is equal to the radial height of the permanent magnet 4, but the radial height of the member 5 may be larger than the radial height of the permanent magnet 4.

Further, the manufacturing method of the rotor 1d is substantially the same as the manufacturing method of the rotor 1. In other words, the manufacturing method of the rotor 1d includes a process of attaching a plurality of permanent magnets 4 to the outer peripheral surface of the cylindrical iron core 3 in the circumferential direction of the iron core 3, and attaching to the outer peripheral surface of the iron core 3. a process of filling a plurality of members 5 respectively in a gap between the permanent magnets 4 adjacent to each other in the circumferential direction; and spraying the non-magnetic material to form a film 7 covering the outer peripheral faces of the plurality of permanent magnets 4 and the plurality of members 5 a process; and a circle covering the outer peripheral surface of the plurality of members 5 and the film 7 on the outer peripheral surface of the film 7 The process of the cylindrical reinforcing member 9.

The following is a description of the configuration of the rotor 1 of the present embodiment and the rotor 1d of the first modification. In other words, the rotor of the rotating electrical machine includes a cylindrical iron core 3, and a plurality of permanent magnets 4 attached to the outer circumference of the iron core 3 and spaced apart in the circumferential direction of the iron core 3; respectively, which are buried in the circumferential direction a gap between the adjacent permanent magnets 4, and a plurality of members 5 attached to the outer peripheral surface of the core 3; a film 7 formed of a molten non-magnetic material and coated at least on the outer peripheral surface of the plurality of permanent magnets 4; And a cylindrical reinforcing member 9 disposed on the outer peripheral surface of the film 7 and covering the outer peripheral surfaces of the plurality of members 5 and the film 7, and the outer peripheral surface of the plurality of members 5 is in contact with the inner peripheral surface of the reinforcing member 9, or The inner peripheral surface of the reinforcing member 9 is in contact with the film 7 .

Further, in the present embodiment, the member 5 is filled between the permanent magnets 4 to form a gap between the permanent magnets 4. However, when the permanent magnet 4 is attached without a gap, the member 5 can be omitted. . The omitted criterion may be, for example, a circumferential width of a gap between the permanent magnets 4 of 2 mm or less.

Fig. 13 is a cross-sectional view showing the rotor 1e of the rotary electric machine according to the second modification of the present embodiment. The cross-sectional view shown in Fig. 13 corresponds to the cross-sectional view shown in Fig. 2. In addition, in the thirteenth figure, the same components as those of the components shown in Fig. 2 are denoted by the same reference numerals. As shown in Fig. 13, the rotor 1e includes a cylindrical iron core 3, and a plurality of permanent magnets 4 attached to the outer circumferential surface of the iron core 3 without a gap in the circumferential direction of the iron core 3; Magnetic material is formed and covered in a plurality of permanent A film 7 on the outer peripheral surface of the magnet 4; and a cylindrical reinforcing member 9 disposed on the outer peripheral surface of the film 7 and covering the outer peripheral surface of the film 7. By configuring the rotor 1e in this manner, the same effects as in the present embodiment can be obtained.

The configuration shown in the above embodiment is merely an example of the present invention, and other conventional techniques may be combined, and a part of the configuration may be omitted or changed without departing from the gist of the present invention.

1‧‧‧Rotor

2‧‧‧Axis

3‧‧‧ iron core

4‧‧‧ permanent magnet

5‧‧‧ components

6‧‧‧core through hole

7‧‧ ‧ film

9‧‧‧Reinforcing components

Claims (10)

A rotor for a rotating electrical machine includes: a cylindrical iron core; a plurality of permanent magnets attached to an outer circumferential surface of the iron core and spaced apart from each other in a circumferential direction of the iron core; and respectively buried in the circumferential direction adjacent to each other a gap between the permanent magnets and a plurality of first members attached to the outer peripheral surface of the iron core; a film formed by spraying a non-magnetic material and covering at least the outer peripheral surface of the plurality of permanent magnets; and a cylindrical second member covering the outer peripheral surface of the plurality of first members and the coating film on an outer peripheral surface of the coating film, wherein an outer peripheral surface of the plurality of first members is in contact with an inner peripheral surface of the second member Or contacting the inner peripheral surface of the second member via the film. The rotor of the rotating electrical machine according to claim 1, wherein a radial height of the first member toward the iron core is greater than a radial height of the permanent magnet toward the iron core; the plurality of first The outer peripheral surface of the member is in contact with the inner peripheral surface of the second member. The rotor for a rotating electrical machine according to claim 1, wherein the coating is applied to the plurality of permanent magnets and an outer peripheral surface of the plurality of first members; and an outer peripheral surface of the coating is in contact with the second member Inner week surface. The rotor of a rotating electrical machine according to any one of claims 1 to 3, wherein the first member is formed of stainless steel, an aluminum alloy, a copper alloy, an iron alloy or a resin. The rotor of a rotating electrical machine according to any one of claims 1 to 3, wherein the film is formed of an aluminum alloy, a copper alloy or a resin. The rotor of a rotating electrical machine according to claim 5, wherein the conductivity of the film is less than or equal to the conductivity of copper. The rotor of a rotating electrical machine according to any one of claims 1 to 3, wherein the second member is formed of carbon fiber reinforced plastic, glass fiber reinforced plastic, titanium or stainless steel. A rotor for a rotating electrical machine comprising: a cylindrical iron core; a plurality of permanent magnets attached to an outer circumferential surface of the iron core without a gap in a circumferential direction of the iron core; and coated with a molten non-magnetic material a film of an outer peripheral surface of the plurality of permanent magnets; and a cylindrical member disposed on an outer peripheral surface of the film and covering an outer peripheral surface of the film. A method of manufacturing a rotor for a rotating electrical machine includes: a process of attaching a plurality of permanent magnets to a circumferential surface of the cylindrical core in a circumferential direction of the iron core; and attaching the outer peripheral surface of the iron core Buried in the aforementioned circumference a process of a plurality of first members facing a gap between the permanent magnets adjacent to each other; a process of spraying a non-magnetic material to form a film covering at least an outer peripheral surface of the plurality of permanent magnets; and an outer peripheral surface of the film a process of arranging a cylindrical second member covering the plurality of first members and the outer peripheral surface of the film; the outer peripheral surface of the plurality of first members contacting the inner peripheral surface of the second member, or via The film is in contact with the inner peripheral surface of the second member. The method of manufacturing a rotor for a rotating electrical machine according to claim 9, wherein after the forming of the film, a process of cutting the outer peripheral surface of the rotor is included.