WO2018027895A1

WO2018027895A1 - Pipe-shaft-type integrated permanent magnet electric motor rotor

Info

Publication number: WO2018027895A1
Application number: PCT/CN2016/094843
Authority: WO
Inventors: 王志强; 李立华
Original assignee: 深圳智慧能源技术有限公司
Priority date: 2016-08-12
Filing date: 2016-08-12
Publication date: 2018-02-15

Abstract

Disclosed is a pipe-shaft-type integrated permanent magnet electric motor rotor, comprising an inner pipe (12) and an outer pipe (14) separated in a radial direction, wherein a vent hole (22) axially extending along the rotor is formed on an inner circumferential face of the inner pipe (12), an annular accommodating space is formed between the inner pipe (12) and the outer pipe (14), and the annular accommodating space is internally provided with a number of permanent magnet poles (16) arranged in a circumferential direction of the rotor. The permanent magnet electric motor rotor uses a pipe-shaft integrated structure, saving on materials and facilitating machining, having a stable structure, being convenient for cooling, being beneficial for the performance of an electric motor, and reducing materials and production costs.

Description

Title: Inventor Name: Tube-Shaped Integrated Permanent Magnet Motor Rotor Technical Field

[0001] The present invention relates to a permanent magnet motor rotor, and more particularly to a tube shaft type integrated permanent magnet motor rotor.

Background technique

[0002] At present, a permanent magnet motor usually has a rotor core and a permanent magnet fixed to the rotor core on the rotor. The stator of the motor generates a magnetic field after being energized to realize rotation of the rotor of the motor, and the rotor is rotated at a high speed. Strong centrifugal force. In order to prevent the permanent magnet from falling due to the centrifugal force and ensuring the good running state of the motor, the permanent magnet must be fixed firmly and reliably. The permanent magnets on the rotor of the permanent magnet motor in the market are mostly fixed by rivets. However, the disadvantage of fixing with rivets is that the permanent magnet is made of neodymium iron boron, the texture is brittle and brittle, the processing of the hole is complicated, the processing is difficult, and the cost is high. , but also affect the performance of the permanent magnets, reducing the running performance of the motor. Due to the use of the rotor core, the rotor size is generally large

[0003] In addition, the rotor of the motor generates a large amount of heat in the case of high-speed rotation, so that the temperature rise of the rotor is too high, and the permanent magnets may irreversibly demagnetize when the temperature is too high, causing serious damage to the motor, and therefore, the motor Heat dissipation has also become one of the core issues in motor design.

technical problem

In view of the above, the present invention proposes a tube-shaft type integrated permanent magnet motor rotor which ensures a permanent magnet is firm and reliable, and can effectively dissipate heat.

Problem solution

Technical solution

[0005] The present invention provides a tube-shaft integrated permanent magnet motor rotor including an inner tube and an outer tube that are radially spaced apart, and an inner peripheral surface of the inner tube forms a vent hole extending along the axial direction of the rotor An annular accommodating space is formed between the inner tube and the outer tube, and a plurality of permanent magnet poles disposed along a circumferential direction of the rotor are disposed in the accommodating space.

In one embodiment, each permanent magnet is formed by a permanent magnet that is fixedly mounted between the inner tube and the outer tube. In an embodiment, an inner surface and an outer surface of the permanent magnet are respectively attached to an outer circumferential surface of the inner tube and an inner circumferential surface of the outer tube.

In one embodiment, the inner surface and the outer surface of the permanent magnet are bonded to the inner circumferential surface of the inner tube and the inner circumferential surface of the outer tube, respectively, by high temperature glue.

In an embodiment, a plurality of magnetic bridges are disposed between the inner circumferential surface of the outer tube and the outer circumferential surface of the inner tube to block the plurality of permanent magnets in the circumferential direction of the rotor.

[0010] In an embodiment, the magnetic isolation bridge is fixed between the outer circumferential surface of the inner tube and the inner circumferential surface of the outer tube by high temperature adhesive bonding.

[0011] In an embodiment, the two ends of the rotor are provided with bearings for supporting the rotation of the rotor, and two support members are disposed at two ends of the accommodating space, and the support member is supported on the inner circumferential surface of the outer tube. And an outer peripheral surface of the inner tube, the bearing being mounted on an outer peripheral surface of the outer tube and corresponding to the support member in a radial direction.

[0012] In an embodiment, each support member is provided with an extension extending toward one end of the permanent magnet, the extension portion abutting the permanent magnet.

[0013] In an embodiment, the two ends of the rotor are provided with bearings for supporting the rotation of the rotor, the length of the inner tube is greater than the length of the outer tube, and the bearing is mounted at both ends of the inner tube. On the outer peripheral surface.

[0014] In some embodiments, the inner and outer tubes are both made of a non-magnetically conductive metal or alloy material.

Advantageous effects of the invention

Beneficial effect

[0015] In summary, the present invention provides a tube-shaft integrated permanent magnet motor rotor, the rotor includes an inner tube and an outer tube that are radially separated, and a permanent magnet is disposed between the inner tube and the outer tube. The inner surface and the outer surface of the permanent magnet are respectively bonded to the outer peripheral surface of the inner tube and the inner peripheral surface of the outer tube by high-temperature glue, and the two ends of the rotor are supported by bearing support, thereby enhancing the firmness and reliability of the permanent magnet and making the motor run more. Stable and safe. In addition, the inner peripheral surface of the inner tube forms a vent hole extending in the axial direction of the rotor. When the motor is running at a high speed, the vent hole can effectively dissipate heat, reduce the temperature of the rotor, and protect the magnetic stability of the permanent magnet. The permanent magnet motor rotor of the invention adopts the integrated structure of the tube shaft, saves materials, facilitates processing, has stable structure and convenient cooling, and is beneficial to the performance of the motor.

Brief description of the drawing

DRAWINGS 1 is a schematic cross-sectional view of a rotor according to an embodiment of the present invention.

2 is a schematic cross-sectional view of the rotor of FIG. 1.

3 is a schematic cross-sectional view of a rotor according to another embodiment of the present invention.

Embodiments of the invention

[0019] Before the embodiments are described in detail, it is understood that the invention is not limited to The invention may be embodied in other ways. Further, it should be understood that the phraseology and terminology used herein are for the purpose of description The words "including", "comprising", "having", and the like, are used in this context to include the items listed thereafter, their equivalents, and other additional items. In particular, when describing "a certain component", the present invention does not limit the number of the components to one, and may include a plurality.

[0020] As shown in FIG. 1 and FIG. 2, the present invention provides a tube-shaft integrated permanent magnet motor rotor 10 comprising an inner tube 12 and an outer tube 14 radially spaced apart, and an outer peripheral surface of the inner tube 12 and An annular accommodating space is formed between the inner peripheral surfaces of the outer tube 14. The accommodating space is provided with a plurality of permanent magnet poles 16 arranged along the circumferential direction of the rotor 10. The ends of the rotor 10 are provided with bearings for supporting the rotation of the rotor 10. 18.

[0021] Each of the plurality of permanent magnet poles 16 is formed by a permanent magnet 16 fixedly mounted in an annular accommodating space formed by the inner tube 12 and the outer tube 14. Specifically, the inner surface and the outer surface of the permanent magnet 16 are respectively attached to the outer peripheral surface of the inner tube 12 and the inner peripheral surface of the outer tube 14, so that the rotor 10 can be prevented from rotating at a high speed, and the permanent magnet 16 is large at a high speed. The centrifugal force causes an offset in the radial direction of the rotor 10. At the same time, the inner surface of the permanent magnet 16 is fixed to the outer peripheral surface of the inner tube 12, and the outer surface of the permanent magnet 16 is fixed to the inner peripheral surface of the outer tube 14, double-fixing action to prevent the rotor 10 from rotating at high speed with the permanent magnet 16 and The inner tube 12 and the outer tube 14 are relatively displaced in the circumferential direction of the rotor 10. In this embodiment, the inner surface and the outer surface of the permanent magnet 16 are respectively bonded to the outer circumferential surface of the inner tube 12 and the inner circumferential surface of the outer tube 14 by high temperature glue, thereby fixing the permanent magnet 16 in the annular accommodation space. . In the present embodiment, both the inner tube 12 and the outer tube 14 are made of a non-magnetic metal or alloy material. Of course, in other embodiments, other suitable materials may also be employed. Since the permanent magnet 16 is directly attached to the inner and outer tubes of the metal material, the heat of the permanent magnet can be quickly transmitted to the inner and outer tubes to dissipate outward.

[0022] It should be understood that in other embodiments, the permanent magnet 16 may also be fixed to the inner tube 12 by other means. The outer peripheral surface and the inner peripheral surface of the outer tube 14 are not limited by the present invention.

Referring to FIG. 2, a plurality of magnetic bridges 20 are disposed between the inner circumferential surface of the outer tube 14 and the outer circumferential surface of the inner tube 12 to isolate the plurality of permanent magnets 16 in the circumferential direction of the rotor 10. In the illustrated embodiment, the magnetic bridges 20 are arranged in four. In other embodiments, the magnetic bridges 20 can also be set to other numbers that meet the operational requirements of the motor. The four magnetic bridges 20 will have the permanent magnets 16 in the rotor. 10 is divided into four permanent magnets 16 in the circumferential direction. The four permanent magnets 16 are generally fixed in the manner of the above-described permanent magnets 16. The inner and outer surfaces of the four permanent magnets 16 are respectively attached to the outer peripheral surface of the inner tube 12 and the inner peripheral surface of the outer tube 14, the permanent magnet 16 The inner surface and the outer surface are bonded to the outer peripheral surface of the inner tube 12 and the inner peripheral surface of the outer tube 14 by high temperature glue, respectively. In addition, in this embodiment, the magnetic bridge 20 is also fixed between the outer circumferential surface of the inner tube 12 and the inner circumferential surface of the outer tube 14 by high-temperature adhesive bonding. Of course, in other embodiments, the magnetic isolation bridge 20 is also The outer peripheral surface of the inner tube 12 and the inner peripheral surface of the outer tube 14 may be fixed by other means, which is not limited by the present invention.

[0024] In the above embodiment, each of the permanent magnet poles is formed of a separate permanent magnet, and more specifically, each of the permanent magnet poles may be formed of one or a plurality of individual permanent magnets. In other embodiments, the permanent magnet poles may also be formed by a toroidal permanent magnet that is magnetized in the circumferential direction into alternating N and S poles.

[0025] The rotor 10 generates a large amount of heat during operation, causing the temperature rise of the rotor 10 to be too high, and the high temperature causes the permanent magnet 16 to irreversibly demagnetize, causing serious damage to the motor and shortening the service life of the rotor. In order to avoid these problems, the inner peripheral surface of the inner tube 12 of the present invention forms a vent hole 22 extending in the axial direction of the rotor 10, which is effective for heat dissipation of the motor and lowering the temperature of the rotor. In the illustrated embodiment, the aperture of the venting opening 22 meets the requirements for rotor strength vibration and ventilation.

In the embodiment shown in FIG. 1 , a bearing 18 for supporting the rotation of the rotor 10 is disposed at both ends of the rotor 10 , and a support member 24 is respectively disposed at two ends of the annular receiving space, and the support member 24 is supported outside. Between the inner peripheral surface of the tube 14 and the outer peripheral surface of the inner tube 12, the bearing 18 is mounted on the outer peripheral surface of the outer tube 14, and the position at which the bearing 18 is mounted is radially opposed to the support position of the support member 24, so that the support member 24 The bearing 18 can be supported.

[0027] In the present embodiment, the support member 24 has a T-shaped structure as viewed from a longitudinal sectional view of the rotor 10 shown in FIG. 1. Specifically, each support member 24 is provided with a corresponding end extending toward the permanent magnet 16 The extension portion 26, the extension portion 26 is in contact with the corresponding end of the permanent magnet 16, so that it can have the function of assisting the positioning of the permanent magnet 16 in the axial direction. The venting opening 22 of the inner tube 12 communicates with the air outside the rotor 10. 3, in the embodiment shown in FIG. 3, the bearing 10 is provided at both ends of the rotor 10 for supporting the rotation of the rotor 10. The length of the inner tube 12 is greater than the length of the outer tube 14, so that part of the inner tube 12 The outer tube 14 is axially extended, and the bearing 18 is mounted on the outer peripheral surface of both ends of the inner tube 12 (i.e., the outer end portion of the portion beyond the outer tube 14), and the vent hole 22 of the inner tube 12 communicates to the outside of the rotor 10.

[0029] The arrangement of the venting holes 22 is simple and reliable, easy to process, easy to implement, and low in cost, not only plays a great role in heat dissipation of the motor, but also saves material, reduces the quality of the rotor 10, reduces motor loss, and then improves the motor. Operational efficiency.

[0030] In the above embodiment, the rotor does not need to be provided with a rotor core, which has the advantages of reducing the core material, eliminating magnetic damping and iron loss, reducing the driving power, reducing the iron loss heat source, and simplifying assembly. , cut costs.

[0031] The connection between the rotor and the driven or driven equipment can be connected through key teeth, end teeth, couplings, etc., to meet product use requirements.

[0032] In summary, the present invention provides a tube-shaft integrated permanent magnet motor rotor, the rotor includes an inner tube and an outer tube that are radially separated, and a permanent magnet is disposed between the inner tube and the outer tube. The inner surface and the outer surface of the permanent magnet are respectively bonded to the outer peripheral surface of the inner tube and the inner peripheral surface of the outer tube by high-temperature glue, and the two ends of the rotor are supported by bearing support, thereby enhancing the firmness and reliability of the permanent magnet and making the motor run more. Stable and safe. In addition, the inner peripheral surface of the inner tube forms a vent hole extending in the axial direction of the rotor. When the motor is running at a high speed, the vent hole can effectively dissipate heat, reduce the temperature of the rotor, and protect the magnetic stability of the permanent magnet. The permanent magnet motor rotor of the invention adopts the integrated structure of the tube shaft, saves materials, facilitates processing, has stable structure and convenient cooling, and is beneficial to the performance of the motor.

[0033] The concepts described herein may be embodied in other forms without departing from the spirit and scope of the invention. The specific embodiments disclosed are to be considered as illustrative and not restrictive. Therefore, the scope of the invention is to be determined by the appended claims rather Any changes which come within the meaning and range of the claims are intended to be within the scope of the claims.

Claims

Claim

[Claim 1] A tube-shaft type integrated permanent magnet motor rotor, comprising: an inner tube and an outer tube that are radially separated, wherein an inner peripheral surface of the inner tube is formed to extend axially along the rotor The venting hole defines an annular accommodating space between the inner tube and the outer tube, and a plurality of permanent magnet poles disposed along the circumferential direction of the rotor are disposed in the accommodating space.

[Claim 2] The tube-shaft type integrated permanent magnet motor rotor according to claim 1, wherein each permanent magnet is formed by a permanent magnet fixedly mounted on the inner tube and the outer tube Between

[Claim 3] The tube-shaft type integrated permanent magnet motor rotor according to claim 2, wherein an inner surface and an outer surface of the permanent magnet are respectively attached to an outer circumferential surface of the inner tube and The inner peripheral surface of the outer tube.

[Claim 4] The tube-shaft type integrated permanent magnet motor rotor according to claim 3, wherein an inner surface and an outer surface of the permanent magnet are bonded to the outer peripheral surface of the inner tube by high temperature glue, respectively The inner peripheral surface of the outer tube.

[Claim 5] The tube-shaft type integrated permanent magnet motor rotor according to claim 3, wherein a plurality of magnetic bridges are disposed between an inner circumferential surface of the outer tube and an outer circumferential surface of the inner tube The plurality of permanent magnets are spaced apart in the circumferential direction of the rotor.

[Claim 6] The tube-shaft type integrated permanent magnet motor rotor according to claim 5, wherein the magnetic isolation bridge is fixed to the outer peripheral surface of the inner tube and the outer portion by high-temperature adhesive bonding Between the inner circumference of the tube.

[Claim 7] The tube-shaft type integrated permanent magnet motor rotor according to claim 5, wherein both ends of the rotor are provided with bearings for supporting the rotation of the rotor, and the two ends of the accommodating space are disposed. Two support members are supported on the inner circumferential surface of the outer tube and the outer circumferential surface of the inner tube, and the bearing is mounted on an outer circumferential surface of the outer tube and corresponds to the support member in a radial direction.

[Claim 8] The tube-shaft type integrated permanent magnet motor rotor according to claim 7, wherein each of the support members is provided with an extension extending toward one end of the permanent magnet, the extension portion abutting Permanent magnets.

[Claim 9] The tube-shaft type integrated permanent magnet motor rotor according to claim 5, wherein A bearing for supporting rotation of the rotor is provided at both ends of the rotor, the length of the inner tube is larger than the length of the outer tube, and the bearing is mounted on an outer peripheral surface of both ends of the inner tube.

[Claim 10] The tube-shaft type integrated permanent magnet motor rotor according to any one of claims 1 to 9, wherein the inner tube and the outer tube are made of a non-magnetic metal or alloy material. to make.