CN112908663A - Method for improving magnetic eccentricity of annular magnet, annular magnet fixed with centering ring and application of annular magnet - Google Patents
Method for improving magnetic eccentricity of annular magnet, annular magnet fixed with centering ring and application of annular magnet Download PDFInfo
- Publication number
- CN112908663A CN112908663A CN201911135724.6A CN201911135724A CN112908663A CN 112908663 A CN112908663 A CN 112908663A CN 201911135724 A CN201911135724 A CN 201911135724A CN 112908663 A CN112908663 A CN 112908663A
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- ring
- magnet
- magnetic
- eccentricity
- annular magnet
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- 230000005291 magnetic effect Effects 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000005294 ferromagnetic effect Effects 0.000 claims abstract description 8
- 229910001172 neodymium magnet Inorganic materials 0.000 claims description 6
- 239000003302 ferromagnetic material Substances 0.000 claims description 5
- 238000004026 adhesive bonding Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000004907 flux Effects 0.000 description 11
- 238000009826 distribution Methods 0.000 description 9
- 239000003292 glue Substances 0.000 description 3
- 238000005034 decoration Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0286—Trimming
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F13/00—Apparatus or processes for magnetising or demagnetising
- H01F13/003—Methods and devices for magnetising permanent magnets
Abstract
The invention discloses a method for improving the magnetic eccentricity of a ring magnet, which is characterized in that an adjusting ring with proper size and position is assembled at the upper end of a ring magnet, and the relative position of the magnetic eccentricity and the geometric center of the ring magnet is changed by depending on the influence of a ferromagnetic medium on a magnetic field, so that the aim of improving the magnetic eccentricity of the ring magnet is fulfilled without changing the installation position of the ring magnet. The method has simple operation and remarkable effect after implementation, and can greatly improve the magnetic eccentricity condition of the magnet. By reasonably selecting the size of the aligning ring and adjusting the position of the aligning ring, the magnetic eccentricity of the annular magnet can be completely aligned with the rotating workpiece.
Description
Technical Field
The invention relates to the technical field of special workpieces, in particular to a method for improving the magnetic eccentricity of a ring magnet, the ring magnet fixed with an adjusting ring and application of the ring magnet.
Background
In some high speed rotating machines, the ring magnet is responsible for providing the axial pulling force, and therefore it is generally desirable that the magnetic eccentricity of the ring magnet not be too great to reduce the degree of deflection of the machine when rotating at high speeds.
The existing annular permanent magnet is generally bonded or sintered and formed by a powder metallurgy method, and the inevitable density unevenness phenomenon exists in the magnet due to the characteristics of the forming process, so that the magnet has larger or smaller magnetic eccentricity, namely the geometric center and the magnetic eccentricity of the annular magnet have deviation, so that the rotating machine deflects when axial tension is provided for the rotating machine, and the service life of the rotating machine is shortened.
Disclosure of Invention
The invention aims to provide a method for improving the magnetic eccentricity of an annular magnet, aiming at the defect that the inclined service life of a rotating machine is shortened due to the existence of the magnetic eccentricity of the annular magnet in the prior art.
In another aspect of the invention, a ring magnet with an alignment ring is obtained using the above method.
In another aspect of the invention, the use of a ring magnet with an alignment ring as described above
The technical scheme adopted for realizing the purpose of the invention is as follows:
a method of improving magnetic eccentricity of a ring magnet, comprising the steps of:
and 3, re-magnetizing the whole body obtained in the step 2, so that the magnetic tension of the magnetized whole body is equal to that of the annular magnet in the step 1.
In the above technical scheme, the aligning ring is fixed by gluing and curing in step 2, so that the aligning ring and the annular magnet are integrated.
In the technical scheme, the height of the centering ring is not more than 10 mm.
In the above technical solution, the inner diameter of the centering ring is larger than the inner diameter of the ring magnet.
In the technical scheme, the inner diameter of the centering ring is 10-15mm larger than that of the annular magnet.
In the above technical solution, the outer diameter of the centering ring is smaller than the outer diameter of the ring magnet.
In the above technical scheme, the annular magnet is a bonded neodymium iron boron magnet.
Another object of the present invention is a ring magnet with an alignment ring obtained by the above method for improving the magnetic eccentricity of a ring magnet.
Another object of the present invention is to provide a method for manufacturing a ring magnet with an alignment ring, which includes providing a magnetic pull force to a workpiece made of ferromagnetic material.
In the technical scheme, the workpiece is an annular thin-wall workpiece in an air gap, and the annular thin-wall workpiece is driven to rotate by a rotation driving device.
Compared with the prior art, the invention has the beneficial effects that:
1. the method for improving the magnetic eccentricity of the annular magnet changes the relative position of the magnetic eccentricity and the geometric center of the annular magnet by depending on the influence of a ferromagnetic medium on a magnetic field, and achieves the purpose of improving the magnetic eccentricity of the annular magnet while not changing the installation position of the annular magnet. The method has simple operation and remarkable effect after implementation, and can greatly improve the magnetic eccentricity condition of the magnet. By reasonably selecting the size of the aligning ring and adjusting the position of the aligning ring, the magnetic eccentricity of the annular magnet can be completely aligned with the rotating workpiece. The method is simple and low in cost.
2. The method for improving the magnetic eccentricity of the annular magnet has better application in high-speed rotating machinery, and improves the magnetic eccentricity of the annular magnet through a simple method, thereby preventing the machine from deflecting during high-speed rotation and prolonging the service life of the rotating machinery.
Drawings
Fig. 1 shows a method for improving the magnetic eccentricity of a ring magnet and a schematic structure of the ring magnet in application to a rotary machine.
Fig. 2 shows the magnetic flux density distribution at a certain position of the air gap after the self-aligning ring is assembled.
In the figure: 1-aligning ring, 2-ring magnet, 3-workpiece.
A is the magnetic flux distribution without the centering ring; b is the magnetic flux distribution when the centering ring is centered with the annular magnet; and C is the magnetic flux distribution when the centering ring and the annular magnet are not centered.
Detailed Description
The present invention will be described in further detail with reference to specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A method of improving magnetic eccentricity of a ring magnet, comprising the steps of:
And 3, re-magnetizing the whole body obtained in the step 2 to enable the magnetic tension of the magnetized whole body to be equal to that of the annular magnet in the step 1, so that the annular magnet with the centering ring is obtained.
The improvement principle is as follows:
the ferromagnetic material has high magnetic conductivity and low magnetic saturation, so that the ferromagnetic material can play a role of gathering magnetic induction lines in a magnetic field, and can be quickly magnetized into a magnetic body in the magnetic field, thereby changing the magnetic flux density of an air gap around the annular magnet; and the centering rings at different positions have different influences on the air gap flux density, so that the magnetic field distribution of the air gap around the annular magnet can be changed by adjusting the position of the ferromagnetic centering ring at the upper end part of the annular magnet, and the aim of improving the magnetic eccentricity of the magnet is fulfilled. The magnetic eccentricity of the ring magnet needs to be measured after the centering ring is assembled, so that the position of the centering ring on the magnet can be determined.
After the centering ring is pasted, the magnetic flux density of the air gap can be changed, the magnetic pulling force provided by the annular magnet to the outside can be changed, and the centering ring and the annular magnet are fixed and then are magnetized again so that the magnetic pulling force provided by the annular magnet meets the requirement.
Preferably, the aligning ring is fixed by gluing and curing in step 2, so that the aligning ring and the ring-shaped magnet are integrated. The operation is specifically that the aligning ring is taken down, and after the adhesive glue is coated, the aligning ring is placed at the recorded position. The magnet to which the centering ring is fitted is then cured, so that the centering ring is integral with the ring magnet.
For different annular magnets, the sizes of the aligning rings 1 meeting the requirements may be different, and the sizes should be reasonably selected according to the situation in actual work.
For the convenience of guaranteeing the assembly aligning ring, the height of aligning ring is not more than 10mm, can make things convenient for the assembly of aligning ring and annular magnet, prevents that too big height's aligning ring from influencing the installation space of magnet.
The inner diameter of the centering ring is larger than that of the annular magnetic block, and the outer diameter of the centering ring is smaller than that of the annular magnetic block, so that the geometric center of the magnet is not greatly changed after the centering ring is assembled. The position of the centering ring and the annular magnet can not be centered, but the inner diameter of the centering ring is 10-15mm larger than that of the annular magnet, and the position of the centering ring needs to be ensured not to influence the inner hole space of the annular magnet; the outer diameter of the centering ring is smaller than that of the ring magnet, in order to prevent interference with the installation space of the ring magnet.
The annular magnetic block is a bonded neodymium iron boron magnet. The bonded neodymium iron boron magnet is formed by pressing after mixing magnetic powder and bonding glue, the magnetic eccentricity is relatively small, and the whole magnetic eccentricity of the magnet can be improved after the centering ring is adopted. If aiming at other magnets with too large magnetic eccentricity, the improvement effect of the self-aligning ring on the magnetic eccentricity is not obvious.
Example 2
The ring magnet with the aligning ring obtained by the method of embodiment 1 is ferromagnetic, the ring magnet is a bonded neodymium iron boron magnet, and the aligning ring and the bonded neodymium iron boron magnet are fixed into a whole after being coated with bonding glue.
Example 3
This example describes the application of the ring magnet with an aligning ring obtained by the method in example 1 and example 2 to a rotary machine.
The application of a ring magnet with an aligning ring in a rotating machine, as shown in fig. 1, the workpiece 3 in the air gap is an annular thin-walled workpiece of ferromagnetic material. The inner diameter of the annular thin-wall workpiece is larger than that of the annular magnet, the outer diameter of the annular thin-wall workpiece is smaller than that of the annular magnet 2, and the wall thickness of the annular thin-wall workpiece is 1-2 mm.
As shown in fig. 2, the magnetic flux density distribution at a certain position of the air gap after assembling the ferromagnetic aligning ring is changed, where a is the magnetic flux distribution without the aligning ring; b is the magnetic flux distribution when the centering ring is centered with the annular magnet; and C is the magnetic flux distribution when the centering ring and the annular magnet are not centered. The above method of improving the magnetic eccentricity of the ring magnet has proved to be practical.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The method for improving the magnetic eccentricity of the annular magnet is characterized by comprising the following steps of:
step 1, adsorbing a ferromagnetic aligning ring on the upper end part of a magnetized annular magnet to change the relative position of the magnetic eccentricity and the geometric center of the annular magnet;
step 2, manually adjusting the position of the centering ring and detecting the magnetic eccentricity of the annular magnet, and fixing the centering ring at the position until the magnetic eccentricity of the annular magnet meets the requirement, so that the centering ring and the annular magnet are integrated;
and 3, re-magnetizing the whole body obtained in the step 2, so that the magnetic tension of the magnetized whole body is equal to that of the annular magnet in the step 1.
2. The method for improving the magnetic eccentricity of the ring magnet according to claim 1, wherein the aligning ring is fixed by gluing and then curing in step 2 so that the aligning ring and the ring magnet are integrated.
3. A method of improving the magnetic eccentricity of a ring magnet according to claim 1, wherein the height of the centering ring is no greater than 10 mm.
4. The method of improving magnetic eccentricity of a ring magnet according to claim 1, wherein the inner diameter of the centering ring is greater than the inner diameter of the ring magnet.
5. The method of improving the magnetic eccentricity of a ring magnet according to claim 4, wherein the inner diameter of the centering ring is 10-15mm greater than the inner diameter of the ring magnet.
6. The method of improving magnetic eccentricity of a ring magnet according to claim 4, wherein the outer diameter of the centering ring is smaller than the outer diameter of the ring magnet.
7. The method of improving the magnetic eccentricity of a ring magnet according to claim 1, wherein the ring magnet is a bonded neodymium iron boron magnet.
8. A ring magnet with an aligning ring obtained by applying the method for improving the magnetic eccentricity of a ring magnet according to any one of claims 1 to 7.
9. Use of a ring magnet with an alignment ring according to claim 8, wherein the ring magnet with an alignment ring provides magnetic tension to a workpiece made of ferromagnetic material.
10. The use according to claim 9, wherein the workpiece is an annular thin-walled workpiece in the air gap, the annular thin-walled workpiece being driven in rotation by a rotary drive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911135724.6A CN112908663A (en) | 2019-11-19 | 2019-11-19 | Method for improving magnetic eccentricity of annular magnet, annular magnet fixed with centering ring and application of annular magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911135724.6A CN112908663A (en) | 2019-11-19 | 2019-11-19 | Method for improving magnetic eccentricity of annular magnet, annular magnet fixed with centering ring and application of annular magnet |
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| Publication Number | Publication Date |
|---|---|
| CN112908663A true CN112908663A (en) | 2021-06-04 |
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| CN201911135724.6A Pending CN112908663A (en) | 2019-11-19 | 2019-11-19 | Method for improving magnetic eccentricity of annular magnet, annular magnet fixed with centering ring and application of annular magnet |
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Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5715119A (en) * | 1980-07-02 | 1982-01-26 | Mitsubishi Heavy Ind Ltd | Manufacture method of magnetic member for magnetic bearing |
| US4857841A (en) * | 1987-12-29 | 1989-08-15 | Eaton Corporation | Proximity detector employing magneto resistive sensor in the central magnetic field null of a toroidal magnet |
| JPH05326232A (en) * | 1992-05-18 | 1993-12-10 | Matsushita Electric Ind Co Ltd | Magnetic circuit component and manufacture thereof |
| JPH0627209A (en) * | 1992-05-11 | 1994-02-04 | Kawasaki Heavy Ind Ltd | Inspecting method for magnet |
| JPH1132472A (en) * | 1998-06-01 | 1999-02-02 | Nippon Riken Kk | Motive power generating device |
| JP2001037124A (en) * | 1999-07-27 | 2001-02-09 | Hitachi Metals Ltd | Rotor |
| CN1466768A (en) * | 2001-08-24 | 2004-01-07 | �����ɷ� | Magnetically hard object and method for adjusting the direction and position of a magnetic vector |
| CN101536289A (en) * | 2006-09-22 | 2009-09-16 | 维克托·伊安娜洛 | Magnetic bearing |
| CN106575569A (en) * | 2014-09-03 | 2017-04-19 | 日立金属株式会社 | Radially anisotropic sintered ring magnet and manufacturing method therefor |
| US20180050429A1 (en) * | 2016-08-16 | 2018-02-22 | Usun Technology Co., Ltd. | Magnetic drive transmission method |
| CN108286569A (en) * | 2018-01-17 | 2018-07-17 | 上海浩灵磁电器件有限公司 | Eccentric outer shroud Horizontal permanent-magnetic bearing |
| CN108438551A (en) * | 2018-03-06 | 2018-08-24 | 中核(天津)科技发展有限公司 | A kind of annular workpieces fill the fixed tool of demagnetization, conveyer system and its fixing means and transfer approach |
| CN207835191U (en) * | 2017-10-13 | 2018-09-07 | 宁波火山电气有限公司 | A kind of rotor using Halbach magnet ring |
| CN110336451A (en) * | 2019-08-12 | 2019-10-15 | 上海微电机研究所(中国电子科技集团公司第二十一研究所) | A kind of combined type bias magnetic force harmonic gear transmission device |
-
2019
- 2019-11-19 CN CN201911135724.6A patent/CN112908663A/en active Pending
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5715119A (en) * | 1980-07-02 | 1982-01-26 | Mitsubishi Heavy Ind Ltd | Manufacture method of magnetic member for magnetic bearing |
| US4857841A (en) * | 1987-12-29 | 1989-08-15 | Eaton Corporation | Proximity detector employing magneto resistive sensor in the central magnetic field null of a toroidal magnet |
| JPH0627209A (en) * | 1992-05-11 | 1994-02-04 | Kawasaki Heavy Ind Ltd | Inspecting method for magnet |
| JPH05326232A (en) * | 1992-05-18 | 1993-12-10 | Matsushita Electric Ind Co Ltd | Magnetic circuit component and manufacture thereof |
| JPH1132472A (en) * | 1998-06-01 | 1999-02-02 | Nippon Riken Kk | Motive power generating device |
| JP2001037124A (en) * | 1999-07-27 | 2001-02-09 | Hitachi Metals Ltd | Rotor |
| CN1466768A (en) * | 2001-08-24 | 2004-01-07 | �����ɷ� | Magnetically hard object and method for adjusting the direction and position of a magnetic vector |
| CN101536289A (en) * | 2006-09-22 | 2009-09-16 | 维克托·伊安娜洛 | Magnetic bearing |
| CN106575569A (en) * | 2014-09-03 | 2017-04-19 | 日立金属株式会社 | Radially anisotropic sintered ring magnet and manufacturing method therefor |
| US20180050429A1 (en) * | 2016-08-16 | 2018-02-22 | Usun Technology Co., Ltd. | Magnetic drive transmission method |
| CN207835191U (en) * | 2017-10-13 | 2018-09-07 | 宁波火山电气有限公司 | A kind of rotor using Halbach magnet ring |
| CN108286569A (en) * | 2018-01-17 | 2018-07-17 | 上海浩灵磁电器件有限公司 | Eccentric outer shroud Horizontal permanent-magnetic bearing |
| CN108438551A (en) * | 2018-03-06 | 2018-08-24 | 中核(天津)科技发展有限公司 | A kind of annular workpieces fill the fixed tool of demagnetization, conveyer system and its fixing means and transfer approach |
| CN110336451A (en) * | 2019-08-12 | 2019-10-15 | 上海微电机研究所(中国电子科技集团公司第二十一研究所) | A kind of combined type bias magnetic force harmonic gear transmission device |
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Application publication date: 20210604 |