CN111725922A - Motor sheath device - Google Patents
Motor sheath device Download PDFInfo
- Publication number
- CN111725922A CN111725922A CN202010617762.1A CN202010617762A CN111725922A CN 111725922 A CN111725922 A CN 111725922A CN 202010617762 A CN202010617762 A CN 202010617762A CN 111725922 A CN111725922 A CN 111725922A
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- CN
- China
- Prior art keywords
- sheath
- permanent magnet
- motor
- guide sleeve
- alloy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
Abstract
The invention provides a motor sheath device, which comprises a motor sheath and a permanent magnet interference assembly structure, wherein the motor sheath comprises a non-magnetic conductive sheath and an alloy sheath; the non-magnetic conducting sheath covers the inner surface of the alloy sheath, and the inner surface of the non-magnetic conducting sheath is used for being connected with the surface of the motor permanent magnet; the permanent magnet interference assembly structure comprises a guide sleeve and a rotating shaft, the rotating shaft and the permanent magnet are in clearance fit, and the inner surface of the guide sleeve is in close clearance fit with the rotating shaft; the lower end face of the guide sleeve is matched with the upper end face of the permanent magnet, and the outer surface of the guide sleeve is sequentially provided with a conical surface, an equal cylindrical surface and a concave surface from one end far away from the permanent magnet to one end close to the permanent magnet; the diameter of the equal cylindrical surface is the same as the outer diameter of the permanent magnet; the outer diameter of the concave surface is smaller than that of the equal cylindrical surface. The invention can not only effectively reduce eddy current loss through the inner non-magnetic conducting sheath, but also improve the reliability of the permanent magnet in high-speed operation through the outer alloy sheath; the rotor assembly process is effectively improved and simplified.
Description
Technical Field
The invention relates to the motor industry, in particular to a motor sheath device.
Background
At the present stage, a sheath of a high-speed permanent magnet synchronous motor is generally a surface-mounted metal sheath, and a surface-mounted magnetic pole generates a large amount of eddy current loss due to the action of a magnetic field of a stator armature winding when running at a high speed; the heat dissipation condition of the rotor is poor, eddy current loss generated by the sheath cannot be effectively dissipated, the heat quantity of the rotor is high, the temperature rise is large, and the operation reliability of the high-speed motor is seriously influenced.
In addition, for the surface-mounted high-speed permanent magnet motor rotor, because the permanent magnet is a brittle material and cannot bear larger centrifugal tensile stress, the high-speed rotor structure usually operates at tens of thousands or even hundreds of thousands of revolutions per minute, and a high-strength sheath is required to provide enough compressive stress for the permanent magnet at high speed in an interference fit manner so as to ensure that the permanent magnet and the sheath are not separated and cracked at high speed. Because the permanent magnet and the sheath adopt an interference fit mode, the interference magnitude is usually only 0.1-0.3mm, and the problems of damage, difficult assembly and the like of the permanent magnet during assembly are easily caused by the traditional mode.
Disclosure of Invention
The invention aims to solve the problems of eddy current loss of a sheath and difficulty in assembly.
In order to achieve the purpose, the invention adopts the technical scheme that:
a motor sheath device comprises a motor sheath and a permanent magnet interference assembly structure, wherein the motor sheath comprises a non-magnetic conductive sheath and an alloy sheath; the non-magnetic conducting sheath covers the inner surface of the alloy sheath, and the inner surface of the non-magnetic conducting sheath is used for being connected with the surface of the motor permanent magnet;
the permanent magnet interference assembly structure comprises a guide sleeve and a rotating shaft, the rotating shaft and the permanent magnet are in clearance fit, and the inner surface of the guide sleeve is in close clearance fit with the rotating shaft; the lower end face of the guide sleeve is matched with the upper end face of the permanent magnet, and the outer surface of the guide sleeve is sequentially provided with a conical surface, an equal cylindrical surface and a concave surface from one end far away from the permanent magnet to one end close to the permanent magnet; the diameter of the equal cylindrical surface is the same as the outer diameter of the permanent magnet; the outer diameter of the concave surface is smaller than that of the equal cylindrical surface so as to prevent the upper end of the assembled motor sheath from being in interference fit with the lower end of the guide sleeve.
Further, the rotating shaft is used as an output shaft of the permanent magnet motor.
Further, the permanent magnet is made of annular or solid rare earth permanent magnet material with high energy density.
Further, the non-magnetic conductive sheath is made of carbon fiber and resin materials in a composite mode.
Further, the non-magnetic conductive sheath is made of carbon fiber and rubber materials in a composite mode.
Further, the non-magnetic conductive sheath is made of glass fiber and resin materials in a composite mode.
Further, the non-magnetic conductive sheath is made of glass fiber and rubber materials in a composite mode.
Further, the non-magnetic conducting sheath is coated on the inner surface of the alloy sheath by adopting a heat treatment process.
Further, the alloy sheath is made of titanium alloy or nickel-chromium-iron alloy.
Compared with the prior art, the invention has the beneficial effects that:
1) through adopting compound sheath, not only can effectively reduce eddy current loss through inlayer non-magnetic conduction sheath, but also can provide sufficient compressive stress for the permanent magnet under high speed through outer alloy sheath, improve the reliability of permanent magnet when high-speed operation.
2) The interference assembly structure of the permanent magnet eliminates the traditional direct installation and connection mode, can avoid the problems of axial deviation and misalignment of the permanent magnet and the sheath in the assembly process and the occurrence of fragmentation accidents, and effectively improves and simplifies the assembly process of the rotor.
Drawings
Fig. 1 is a schematic structural diagram of a motor sheathing apparatus of the present invention.
Detailed Description
As shown in fig. 1, the present invention provides a motor sheath device, which includes a motor sheath 12 and a permanent magnet interference assembly structure, wherein the motor sheath 12 includes a non-magnetic conducting sheath and an alloy sheath; the non-magnetic conducting sheath covers the inner surface of the alloy sheath, and the inner surface of the non-magnetic conducting sheath is used for being connected with the surface of the motor permanent magnet 13;
the permanent magnet interference assembly structure comprises a guide sleeve 11 and a rotating shaft 14, the rotating shaft 14 is in clearance fit with the permanent magnet 13, and the inner surface of the guide sleeve 11 is in close clearance fit with the rotating shaft 14; the lower end face of the guide sleeve 11 is matched with the upper end face of the permanent magnet 13, so that the compression is ensured and the interference fit is avoided; the outer surface of the guide sleeve 11 is sequentially provided with a conical surface, an equal cylindrical surface and a concave surface from one end far away from the permanent magnet 13 to one end close to the permanent magnet 13; the diameter of the equal cylindrical surface is the same as the outer diameter of the permanent magnet 13; the outer diameter of the concave surface is smaller than that of the equal cylindrical surface so as to prevent the upper end of the assembled motor sheath 12 from being in interference fit with the lower end of the guide sleeve 11.
In order to achieve an interference fit, it should be ensured that the outer diameter of the permanent magnet 13 is larger than the inner diameter of the motor sheath 12. The motor sheath 12 is heated to expand and is kept warm to reach thermal balance, the motor sheath 12 can be installed on the outer surface of the permanent magnet 13 from top to bottom through the guide sleeve 11 by detecting that the expansion amount of the inner diameter of the motor sheath 12 exceeds the outer diameter of the permanent magnet 13 by a certain amount, and when the temperature is recovered to the room temperature, the interference assembly of the motor sheath 12 and the permanent magnet 13 is realized. The interference assembly structure of the permanent magnet eliminates the traditional direct installation and connection mode, can avoid the problems of axial deviation and misalignment of the permanent magnet and the sheath in the assembly process and the occurrence of fragmentation accidents, and effectively improves and simplifies the assembly process of the rotor.
In the present embodiment, the rotating shaft 14 serves as an output shaft of the permanent magnet motor.
In the present embodiment, the permanent magnet 13 is made of a ring-shaped or solid rare earth permanent magnet material with high energy density.
In this embodiment, the magnetically impermeable sheath may be made of a composite of carbon fiber and resin material.
In this embodiment, the magnetically non-conductive sheath may also be made of a composite of carbon fiber and rubber material.
In this embodiment, the non-magnetic conductive sheath may also be made of a composite of glass fiber and resin material.
In this embodiment, the non-magnetic conductive sheath may also be made of a composite of glass fiber and rubber material.
In this embodiment, the non-magnetic conductive sheath may be coated on the inner surface of the alloy sheath by a heat treatment process, in which carbon fiber or glass fiber is used as a main material, resin or rubber is used as an adhesive material, and the carbon fiber or glass fiber material is adhered on the inner surface of the alloy sheath by the heat treatment process to form the composite sheath.
In this embodiment, the alloy sheath may be made of high-strength titanium alloy or nickel-chromium-iron alloy, and the tensile strength reaches over 1000 MPa.
Through adopting compound sheath, not only can effectively reduce the eddy current loss through the inlayer does not lead magnetic sheath, but also can provide sufficient compressive stress for the permanent magnet under high speed through outer alloy sheath, improve the reliability of permanent magnet when high-speed operation.
The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A motor sheath device is characterized by comprising a motor sheath and a permanent magnet interference assembly structure, wherein the motor sheath comprises a non-magnetic conducting sheath and an alloy sheath; the non-magnetic conducting sheath covers the inner surface of the alloy sheath, and the inner surface of the non-magnetic conducting sheath is used for being connected with the surface of the motor permanent magnet;
the permanent magnet interference assembly structure comprises a guide sleeve and a rotating shaft, the rotating shaft and the permanent magnet are in clearance fit, and the inner surface of the guide sleeve is in close clearance fit with the rotating shaft; the lower end face of the guide sleeve is matched with the upper end face of the permanent magnet, and the outer surface of the guide sleeve is sequentially provided with a conical surface, an equal cylindrical surface and a concave surface from one end far away from the permanent magnet to one end close to the permanent magnet; the diameter of the equal cylindrical surface is the same as the outer diameter of the permanent magnet; the outer diameter of the concave surface is smaller than that of the equal cylindrical surface so as to prevent the upper end of the assembled motor sheath from being in interference fit with the lower end of the guide sleeve.
2. The motor sheath apparatus of claim 1 wherein the shaft acts as an output shaft of a permanent magnet motor.
3. The motor sheath apparatus of claim 2, wherein the permanent magnet is made of ring or solid high energy density rare earth permanent magnet material.
4. The electric machine sheath apparatus of claim 1, wherein the magnetically non-conductive sheath is made of a composite of carbon fiber and a resin material.
5. The motor sheath apparatus of claim 1 wherein the magnetically impermeable sheath is made of a composite of carbon fiber and rubber material.
6. The electric machine sheath apparatus of claim 1, wherein the magnetically non-conductive sheath is made of a composite of fiberglass and resin material.
7. The electric machine sheath apparatus of claim 1, wherein the magnetically non-conductive sheath is made of a composite of fiberglass and rubber material.
8. The motor sheath apparatus of any one of claims 4 to 7 wherein the magnetically impermeable sheath is applied to the inner surface of the alloy sheath by a heat treatment process.
9. The motor sheath apparatus of claim 1 wherein the alloy sheath is made of titanium alloy or nickel-chromium-iron alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010617762.1A CN111725922A (en) | 2020-06-30 | 2020-06-30 | Motor sheath device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010617762.1A CN111725922A (en) | 2020-06-30 | 2020-06-30 | Motor sheath device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111725922A true CN111725922A (en) | 2020-09-29 |
Family
ID=72570710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010617762.1A Pending CN111725922A (en) | 2020-06-30 | 2020-06-30 | Motor sheath device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111725922A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107579614A (en) * | 2017-09-26 | 2018-01-12 | 南京磁之汇电机有限公司 | Rotor and high-speed permanent magnet motor |
| CN107800213A (en) * | 2017-10-17 | 2018-03-13 | 天津飞旋高速电机科技有限公司 | Combined high-speed permanent magnet machine rotor and its manufacture method |
| CN109167448A (en) * | 2018-09-30 | 2019-01-08 | 北京航空航天大学 | A kind of surface-mount type high-speed permanent magnet motor sheath and permanent magnet elastic conjunction structure |
| CN110661353A (en) * | 2019-10-18 | 2020-01-07 | 捷和电机制品(深圳)有限公司 | Motor rotor and permanent magnet motor |
| CN210225085U (en) * | 2019-07-18 | 2020-03-31 | 浙江大学 | Permanent magnet motor rotor structure for enhancing shielding effect of harmonic magnetic field |
-
2020
- 2020-06-30 CN CN202010617762.1A patent/CN111725922A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107579614A (en) * | 2017-09-26 | 2018-01-12 | 南京磁之汇电机有限公司 | Rotor and high-speed permanent magnet motor |
| CN107800213A (en) * | 2017-10-17 | 2018-03-13 | 天津飞旋高速电机科技有限公司 | Combined high-speed permanent magnet machine rotor and its manufacture method |
| CN109167448A (en) * | 2018-09-30 | 2019-01-08 | 北京航空航天大学 | A kind of surface-mount type high-speed permanent magnet motor sheath and permanent magnet elastic conjunction structure |
| CN210225085U (en) * | 2019-07-18 | 2020-03-31 | 浙江大学 | Permanent magnet motor rotor structure for enhancing shielding effect of harmonic magnetic field |
| CN110661353A (en) * | 2019-10-18 | 2020-01-07 | 捷和电机制品(深圳)有限公司 | Motor rotor and permanent magnet motor |
Non-Patent Citations (1)
| Title |
|---|
| 陈吉清等: "《汽车结构轻量化设计与分析方法》", 30 April 2017 * |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200929 |
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| RJ01 | Rejection of invention patent application after publication |