CN104426291A - Magnetic bearing system - Google Patents
Magnetic bearing system Download PDFInfo
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- CN104426291A CN104426291A CN201310410126.1A CN201310410126A CN104426291A CN 104426291 A CN104426291 A CN 104426291A CN 201310410126 A CN201310410126 A CN 201310410126A CN 104426291 A CN104426291 A CN 104426291A
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- magnetic
- isolation plate
- bearing system
- winding
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Abstract
The invention relates to a magnetic bearing system which comprises a main shaft, a motor stator, a bearing stator, a shell and a shielding device, wherein the motor stator and the bearing stator are respectively arranged in the shell and are installed on the main shaft; the motor stator is provided with a motor winding, and the bearing stator is provided with a bearing winding; the shielding device is arranged between the motor winding and the bearing winding to play a magnetism isolating role. The magnetic bearing system provided by the invention can effectively achieve the purposes of avoiding the overlong main shaft of the motor and reducing electromagnetic interference.
Description
Technical field
The present invention relates to a kind of magnetic levitation bearing system, particularly relate to a kind of magnetic levitation bearing system with heavy-duty motor.
Background technology
Refer to shown in Fig. 1, it is the structural representation of existing magnetic levitation bearing system, and magnetic levitation bearing system 100 comprises main shaft 110, motor stator 120, bearing stator 130, casing 140 and transducer 150.
Motor stator 120 and bearing stator 130 are placed in casing 140 respectively, and are arranged on main shaft 110.Motor stator 120 has motor winding 122, bearing stator 130 has bearing winding 132, motor winding 122 is L with the minimum distance of bearing winding 132.
In the motor winding 122 of powerful motor, electric current is very large, for avoiding the high-frequency electromagnetic harmonic wave of motor winding 122 end to the winding of small electric stream, such as larger interference is produced to bearing winding 132, bearing winding 132 is even made to occur serious problem, magnetic levitation bearing system more than 100 adopts the mode of the spacing L increasing motor winding 122 and bearing winding 132, reduce motor big current and high-frequency electromagnetic harmonic wave to bearing winding 132, reduce the impact on transducer 150 collection signal simultaneously.
Add the length of main shaft 110 so to a certain extent, the natural frequency of main shaft 110 is reduced, cause the critical whirling speed of magnetic levitation bearing system 100 to reduce.
In view of above-mentioned defect, the present inventor obtains the invention finally through long research and practice.
Summary of the invention
Based on this, be necessary to provide a kind of and the length of electric machine main shaft effectively can be avoided long and the magnetic levitation bearing system of electromagnetic interference can be reduced.
A kind of magnetic levitation bearing system of the present invention, comprises main shaft, motor stator, bearing stator, casing and screening arrangement;
Described motor stator and described bearing stator are placed in described casing respectively, and are arranged on described main shaft;
Described motor stator is provided with motor winding, described bearing stator is provided with bearing winding;
Described screening arrangement is placed between described motor winding and described bearing winding, plays separated magnetic effect.
Preferably, described screening arrangement comprises magnetic isolation plate; Described magnetic isolation plate is fixedly attached on described casing;
Described magnetic isolation plate uses high magnetic conductivity soft magnetic material to make.
Preferably, the quantity of magnetic isolation plate described in described screening arrangement is at least one.
Preferably, described motor winding divides and is interposed between independently space by described magnetic isolation plate.
Preferably, the quantity of described screening arrangement is at least one.
Preferably, the thickness range of described magnetic isolation plate is 0.5 ~ 3mm.
Preferably, described magnetic isolation plate is flat board, arc or waveform plate.
Preferably, the cross sectional shape of described magnetic isolation plate is irregularly shaped.
Preferably, the relative permeability of described magnetic isolation plate is 1000.
Preferably, described magnetic levitation bearing system also comprises transducer, and described transducer is placed between described screening arrangement and described bearing winding.
Beneficial effect of the present invention is compared with the prior art: the electromagnetic interference that the big current effectively reducing motor winding in heavy-duty motor causes; The shielding efficiency of high magnetic conductivity soft magnetic material is high; Magnetic isolation plate mounting structure is simple, and maintenance, replacing are conveniently; Main shaft axially takes up room little, on the natural frequency of main shaft and the impact of critical frequency little; Magnetic isolation plate thickness and cross sectional shape can flexible design; The mode of multiple layer combination can flexible shield effectiveness, and adaptability is very strong.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing magnetic levitation bearing system;
Fig. 2 is the structural representation of the first embodiment of magnetic levitation bearing system of the present invention;
Fig. 3 is the structural representation of the second embodiment of magnetic levitation bearing system of the present invention.
Embodiment
In order to the problem that the length solving electric machine main shaft is long, proposing a kind ofly does not increase main axis length and the magnetic levitation bearing system that can reduce electromagnetic interference realizes.
Below in conjunction with accompanying drawing, to above-mentioned being described in more detail with other technical characteristic and advantage of the present invention.
Refer to shown in Fig. 2, it is the structural representation of the first embodiment of magnetic levitation bearing system of the present invention, and magnetic levitation bearing system 100 comprises main shaft 110, motor stator 120, bearing stator 130, casing 140 and transducer 150.
Motor stator 120 and bearing stator 130 are placed in casing 140 respectively, and are arranged on main shaft 110.Motor stator 120 has motor winding 122, bearing stator 130 has bearing winding 132, transducer 150 is placed near bearing stator 130.
In magnetic suspension system at a high speed, heavy-duty motor due to the electric current of motor winding 122 large, the humorous wave interference of high-frequency electromagnetic in motor winding 122 end space can disturb to bearing winding 132, even makes the control of bearing winding 132 occur serious problems.
In the present embodiment, magnetic levitation bearing system 100 also comprises screening arrangement, and screening arrangement is placed between motor stator 120 and bearing stator 130.Screening arrangement will not wish to cover between disturbed area, will not wish to separate completely with motor winding 122 between disturbed area.Transducer 150 and bearing stator 130 are positioned at the same side, are also subject to the shielding action of screening arrangement.
Screening arrangement comprises magnetic isolation plate 160, and the electromagnetic field of high frequency of magnetic isolation plate 160 pairs of motor windings 122 shields, to reduce the electromagnetic field of high frequency of motor winding 122 to the interference of bearing winding 132; Low frequency alternating magnetic field shielding is belonged to the shielding of motor winding 122 magnetic interference.
Magnetic isolation plate 160 uses high magnetic conductivity soft magnetic material to be made, magnetic isolation plate 160 forms low magnetic circuits, spatial electromagnetic is disturbed absorbed by high magnetic conductivity soft magnetic material, thus reach the effect shielded by high-intensity magnetic field, effectively cut off electromagnetic interference signal and enter bearing winding 132 and transducer 150.The relative permeability of this high magnetic conductivity soft magnetic material is higher, and low magnetoresistive characteristic is better, and shielding efficiency is higher, and shield effectiveness also will be more obvious.
More preferably, according to the size of space magnetic field intensity, the magnetic isolation plate 160 can choosing different-thickness shields.Magnetic isolation plate 160 generally can adopt thickness to be about 0.5 ~ 3mm.
In the present embodiment, magnetic isolation plate 160 preferentially adopts the thickness of 2mm, the relative permeability of high magnetic conductivity soft magnetic material is 1000, and the shielding efficiency of magnetic isolation plate 160 can to more than 80dB, the electromagnetic interference that the big current that can effectively reduce motor winding 122 in heavy-duty motor causes.
Screening arrangement adopts the connectors such as bolt to be fixed on casing 140 by magnetic isolation plate 160, and magnetic isolation plate 160 is placed between motor stator 120 and bearing stator 130, the tabular mounting structure of magnetic isolation plate 160, and structure is simple, and maintenance, replacing are conveniently.In the present embodiment, magnetic isolation plate 160 is dull and stereotyped.
So just not needing for avoiding electromagnetic interference to increase motor winding 122 with the minimum distance of bearing winding 132 is L, then the increase of main shaft 110 length is caused, the axial space that the main shaft 110 of magnetic levitation bearing system 100 takies is little, effectively can shorten the distance between the distalmost end of motor stator 120 and the distalmost end of bearing stator 130, in the present embodiment, about distance 16mm between the two can be reduced.
The present invention significantly reduces the axial length of main shaft 110 relative to prior art, and the natural frequency of main shaft 110 is improved, and causes the critical whirling speed of magnetic levitation bearing system 100 to improve.
More preferably, also shielding efficiency can be improved by increasing the number of plies of magnetic isolation plate 160, can flexible screening effectiveness according to the actual requirements.
Refer to shown in Fig. 3, it is the structural representation of the second embodiment of magnetic levitation bearing system of the present invention, and in the present embodiment, magnetic isolation plate 160 does camber.Screening arrangement will not wish to cover between disturbed area, will not wish to separate completely with motor winding 122 between disturbed area.
Now, when ensureing to shield electromagnetic interference, motor winding 122 and bearing winding 132 position can be overlapping, the length of main shaft 110 can be shortened, magnetic levitation bearing system 100 is arranged compacter, the natural frequency of main shaft 110 improves, and causes the critical whirling speed of magnetic levitation bearing system 100 to improve.
According to the layout of motor stator in reality 120 with bearing stator 130, consider the size of mounting structure, can be designed to the magnetic isolation plate 160 of other irregular section shapes, the adaptability of the magnetic isolation plate 160 of different cross section shape is very strong, can be widely used in the magnetic levitation bearing system 100 of various sizes.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (10)
1. a magnetic levitation bearing system, comprises main shaft, motor stator, bearing stator and casing, it is characterized in that, also comprise screening arrangement;
Described motor stator and described bearing stator are placed in described casing respectively, and are arranged on described main shaft;
Described motor stator is provided with motor winding, described bearing stator is provided with bearing winding;
Described screening arrangement is placed between described motor winding and described bearing winding, plays separated magnetic effect.
2. magnetic levitation bearing system according to claim 1, is characterized in that, described screening arrangement comprises magnetic isolation plate; Described magnetic isolation plate is fixedly attached on described casing;
Described magnetic isolation plate uses high magnetic conductivity soft magnetic material to make.
3. magnetic levitation bearing system according to claim 2, is characterized in that, the quantity of magnetic isolation plate described in described screening arrangement is at least one.
4. magnetic levitation bearing system according to claim 3, is characterized in that, described motor winding divides and is interposed between independently space by described magnetic isolation plate.
5. magnetic levitation bearing system according to claim 1, is characterized in that, the quantity of described screening arrangement is at least one.
6. magnetic levitation bearing system according to claim 2, is characterized in that, the thickness range of described magnetic isolation plate is 0.5 ~ 3mm.
7. magnetic levitation bearing system according to claim 6, is characterized in that, described magnetic isolation plate is flat board, arc or waveform plate.
8. magnetic levitation bearing system according to claim 6, is characterized in that, the cross sectional shape of described magnetic isolation plate is irregularly shaped.
9. magnetic levitation bearing system according to claim 2, is characterized in that, the relative permeability of described magnetic isolation plate is 1000.
10. magnetic levitation bearing system according to claim 1, is characterized in that, also comprises transducer, and described transducer is placed between described screening arrangement and described bearing winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310410126.1A CN104426291A (en) | 2013-09-10 | 2013-09-10 | Magnetic bearing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310410126.1A CN104426291A (en) | 2013-09-10 | 2013-09-10 | Magnetic bearing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104426291A true CN104426291A (en) | 2015-03-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310410126.1A Pending CN104426291A (en) | 2013-09-10 | 2013-09-10 | Magnetic bearing system |
Country Status (1)
| Country | Link |
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| CN (1) | CN104426291A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787457A (en) * | 2016-12-29 | 2017-05-31 | 中铁二院工程集团有限责任公司 | Magnetic-levitation magnetic shielding device and method |
| CN112865421A (en) * | 2020-12-21 | 2021-05-28 | 山东大学 | Five-degree-of-freedom single-winding bearingless magnetic suspension motor |
Citations (7)
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| CN1852005A (en) * | 2006-04-30 | 2006-10-25 | 南京航空航天大学 | Super-high-speed high-power magnetic-suspension main-shaft motor |
| CN1945940A (en) * | 2006-07-18 | 2007-04-11 | 沈阳工业大学 | Integrated permanent magnet rotor magnetic suspension high speed motor |
| US20070164627A1 (en) * | 2006-01-13 | 2007-07-19 | Maurice Brunet | Device for magnetically suspending a rotor |
| CN101005227A (en) * | 2007-01-16 | 2007-07-25 | 北京航空航天大学 | Coaxial two section four margin brushless DC torque motor |
| JP2008045586A (en) * | 2006-08-11 | 2008-02-28 | Ntn Corp | Motor integrated magnetic bearing device |
| CN103269142A (en) * | 2013-05-27 | 2013-08-28 | 浙江建达电器有限公司 | High-speed permanent magnet motor for molecular pump |
| CN203491844U (en) * | 2013-09-10 | 2014-03-19 | 珠海格力节能环保制冷技术研究中心有限公司 | Magnetic suspension bearing system |
-
2013
- 2013-09-10 CN CN201310410126.1A patent/CN104426291A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070164627A1 (en) * | 2006-01-13 | 2007-07-19 | Maurice Brunet | Device for magnetically suspending a rotor |
| CN1852005A (en) * | 2006-04-30 | 2006-10-25 | 南京航空航天大学 | Super-high-speed high-power magnetic-suspension main-shaft motor |
| CN1945940A (en) * | 2006-07-18 | 2007-04-11 | 沈阳工业大学 | Integrated permanent magnet rotor magnetic suspension high speed motor |
| JP2008045586A (en) * | 2006-08-11 | 2008-02-28 | Ntn Corp | Motor integrated magnetic bearing device |
| CN101005227A (en) * | 2007-01-16 | 2007-07-25 | 北京航空航天大学 | Coaxial two section four margin brushless DC torque motor |
| CN103269142A (en) * | 2013-05-27 | 2013-08-28 | 浙江建达电器有限公司 | High-speed permanent magnet motor for molecular pump |
| CN203491844U (en) * | 2013-09-10 | 2014-03-19 | 珠海格力节能环保制冷技术研究中心有限公司 | Magnetic suspension bearing system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787457A (en) * | 2016-12-29 | 2017-05-31 | 中铁二院工程集团有限责任公司 | Magnetic-levitation magnetic shielding device and method |
| CN112865421A (en) * | 2020-12-21 | 2021-05-28 | 山东大学 | Five-degree-of-freedom single-winding bearingless magnetic suspension motor |
| CN112865421B (en) * | 2020-12-21 | 2024-04-09 | 山东大学 | Five-degree-of-freedom single-winding bearingless magnetic suspension motor |
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Application publication date: 20150318 |