CN104121290B - A kind of internal rotor magnetic bearing - Google Patents
A kind of internal rotor magnetic bearing Download PDFInfo
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- CN104121290B CN104121290B CN201410382326.5A CN201410382326A CN104121290B CN 104121290 B CN104121290 B CN 104121290B CN 201410382326 A CN201410382326 A CN 201410382326A CN 104121290 B CN104121290 B CN 104121290B
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- internal rotor
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Abstract
A kind of internal rotor magnetic bearing,By U-shaped passive part internal rotor magnetic guiding loop,Internal rotor permanent-magnetic body,Internal rotor magnetic conductor,Internal rotor is unshakable in one's determination,Air gap,Stator core,Stator magnetic guiding loop,Stator permanent magnet,Coil,U-shaped passive part stator magnetic guiding loop and passive part air gap composition,Wherein each stator core is made up of 4 magnetic poles,Separately constitute X,The magnetic pole of the positive negative direction of Y-axis,Certain gap is left with stator core inner surface in internal rotor iron core outer surface,Form air gap,U-shaped passive part stator magnetic guiding loop is between two stator cores,There are two stator permanent magnets between stator core and U-shaped passive part stator magnetic guiding loop,It is two internal rotor permanent-magnetic bodies between internal rotor magnetic conductor,Passive part air gap is formed between the outer surface of U-shaped passive part internal rotor magnetic guiding loop and the inner surface of U-shaped passive part stator magnetic guiding loop,The present invention has small volume,Easy-to-dismount feature.
Description
Technical field
The present invention relates to a kind of non-contact magnetically suspension bearing, particularly a kind of internal rotor magnetic bearing, for providing four freely
The supporting of degree, can be as the contactless of the rotary part such as space single-gimbal control momentum gyro and double framework control-moment gyros
Support.
Background technology
The hybrid magnetic suspension bearing of the pure electromagnetic type of magnetic suspension bearing point and permanent magnet bias power-up magnetic control, the former uses electricity
Stream is big, power consumption is big, and permanent magnet bias powers up the hybrid magnetic suspension bearing of magnetic control, is substituted using permanent magnet in pure electromagnetism magnetic bearing
Bias current produce bias magnetic field, magnetic field caused by permanent magnet undertakes main bearing capacity, and electromagnetism magnetic field provides the tune of auxiliary
Bearing capacity is saved, thus this bearing can greatly reduce control electric current, having reduces the loss of power amplifier, reduces magnetic bearing peace
The number of turn, reduce magnetic bearing volume, improve the advantages that bearing load carrying capacity, therefore permanent magnet biased magnetic bearing is in magnetic suspension motor, high speed
The high-speed motion occasion of the magnetic suspension bearings such as fly wheel system, control-moment gyro system is widely used.Space magnetic
Suspension control-moment gyro is supported using magnetic bearing, due to overcoming the friction and not of conventional mechanical bearings control-moment gyro
The problems such as balance vibration, therefore higher rotating speed, longer life-span and higher output torque precision can be realized.Existing magnetic
Suspension control-moment gyro is in order to improve output torque size, and the magnetic bearing of the full active of generally use five degree of freedom configures, still
Control of the magnetic suspension control torque gyroscope of this structure due to realizing output torque using electric current, therefore power consumption is big, volume is big,
Complex circuit, and with the two-freedom magnetic suspension control torque gyroscope of passive magnetic bearing output torque although can be made with volume
It is small, but because passive magnetic bearing is uncontrollable, therefore exist and damp the defects of low, stability is poor, in addition, existing passive magnetic bearing
If improve its passive bearing rigidity, radial direction active magnetic bearings can be brought with additional displacement negative stiffness.
The content of the invention
The technology of the present invention solves problem：Overcome the deficiencies in the prior art, there is provided a kind of internal rotor magnetic bearing, to reduce
Own vol weight and power consumption.
The present invention technical solution be：A kind of internal rotor magnetic bearing, by U-shaped passive part internal rotor magnetic guiding loop, interior
Rotor permanent magnet, internal rotor magnetic conductor, internal rotor iron core, air gap, stator core, stator magnetic guiding loop, stator permanent magnet, coil, U
Shape passive part stator magnetic guiding loop and passive part air gap composition, wherein each stator core is made up of 4 magnetic poles, two stators
Iron core composition magnetic bearing 8 magnetic poles of upper and lower ends, separately constitute the magnetic pole of the positive negative direction of X, Y-axis, the magnetic pole of each stator core
On be wound with coil, it is unshakable in one's determination for internal rotor inside stator core, internal rotor it is unshakable in one's determination it is internal be internal rotor magnetic conductor, internal rotor iron core
Certain gap is left in outer surface with stator core inner surface, forms air gap, and the radially outer of stator core is stator magnetic guiding loop,
One U-shaped passive part stator magnetic guiding loop is between two stator cores, stator core and U-shaped passive part stator magnetic guiding loop
Between have two stator permanent magnets, the inner radial of U-shaped passive part stator magnetic guiding loop is U-shaped passive part internal rotor magnetic conduction
Ring, is two internal rotor permanent-magnetic bodies between internal rotor magnetic conductor and U-shaped passive part internal rotor magnetic guiding loop, in U-shaped passive part
Certain interval is left between the outer surface of rotor magnetic guiding loop and the inner surface of U-shaped passive part stator magnetic guiding loop, forms operand
Divide air gap.
The magnetic pole of described each stator core is wound with coil as individually control.
Described each internal rotor permanent-magnetic body and each stator permanent magnet are axial annulus, are magnetized vertically, and volume phase
Deng.
The magnetic pole of described stator core uses pole shoe form.
Described U-shaped passive part internal rotor magnetic guiding loop and the tooth of U-shaped passive part stator magnetic guiding loop be two, three or
Four.
The principle of such scheme is：Internal rotor magnetic bearing, by individually controlling the electric current in each coil, that is to say, that
" individually control " refers to that the electric current in each coil does not contact directly, is detected by power amplifier according to displacement transducer
Detection air gap change is powered to each magnetic pole of the stator coil, realizes the radial direction translation of magnetic bearing rotating part and radially turns round
It is dynamic, produced using the stator magnetic guiding loop and U-shaped passive part internal rotor magnetic guiding loop of the U-shaped passive part of centre by axial displacement
Magnetic biasing pulling force realize the axial translation of magnetic bearing rotating part.Stator permanent magnet and internal rotor permanent-magnetic body provide forever to magnetic bearing
Magnetic bias magnetic field, the radial load suffered by magnetic bearing is undertaken, magnetic field caused by coil is played regulatory role, and often magnetic is extremely descended for changing
The power of field, keep magnetic bearing rotor air gap uniform, and rotor is obtained contactless support.The permanent magnetic circuit of the present invention is two
Individual part (as shown in Figure 3), a part are：Magnetic flux is fixed by stator magnetic guiding loop, upper end from upper end stator permanent magnet N poles
Sub- iron core, upper end air gap, upper end internal rotor iron core, upper end internal rotor magnetic conductor, upper end internal rotor permanent-magnetic body, upper end U-shaped are passive
Tooth, upper end passive part air gap, tooth, the stator magnetic conduction of upper end U-shaped passive part stator magnetic guiding loop of part internal rotor magnetic guiding loop
It is looped back to the S poles of upper end stator permanent magnet；Part II is：Magnetic flux passes through stator magnetic conduction from lower end stator permanent magnet N poles
Ring, lower end stator core, lower end air gap, lower end internal rotor iron core, lower end internal rotor magnetic conductor, lower end internal rotor permanent-magnetic body, under
Hold the tooth of U-shaped passive part internal rotor magnetic guiding loop, lower end passive part air gap, lower end U-shaped passive part stator magnetic guiding loop tooth,
Stator magnetic conduction is looped back to the S poles of lower end stator permanent magnet；As shown in Fig. 2 with magnetic flux caused by certain end Y-axis positive direction coil current
Exemplified by, its path is：Y-axis positive direction magnetic pole that stator core is formed, Y-axis positive direction air gap are to internal rotor iron core and then to another
Outer three direction air gaps, stator core formed the other three direction magnetic pole, return to stator core formation Y-axis positive direction magnetic
Pole, form closed-loop path.
The present invention compared with prior art the advantages of be：The present invention provides the radial load of four-degree-of-freedom using stator core
And torque, control accuracy is high, and axial translational degree of freedom is realized to be passive, low in energy consumption, small volume；Each stator permanent magnet of the present invention
Body is identical with internal rotor permanent-magnetic body volume, and magnetic bearing residual magnetic moment can be caused close to zero, to meet the requirement of space flight；In addition, this hair
Bright axial passive part is domain structure, and magnetic fluctuation is small, rotates small power consumption.
Brief description of the drawings
Fig. 1 is the internal rotor magnetic bearing axial sectional view of the present invention；
Fig. 2 is the internal rotor magnetic bearing axial end view drawing of the present invention；
Fig. 3 is the permanent magnetic circuit figure of the internal rotor magnetic bearing of the present invention；
Fig. 4 is the U-shaped passive part internal rotor magnetic guiding loop of the present invention and passive part stator magnetic guiding loop is three teeth
Internal rotor magnetic bearing axial sectional view.
Embodiment
As shown in figure 1, a kind of internal rotor magnetic bearing, by U-shaped passive part internal rotor magnetic guiding loop 1, internal rotor permanent-magnetic body 2,
Internal rotor magnetic conductor 3, internal rotor iron core 4, air gap 5, stator core 6, stator magnetic guiding loop 7, stator permanent magnet 8, coil 9, U-shaped quilt
Dynamic partial stator magnetic guiding loop 10 and passive part air gap 11 form, wherein each stator core 6 is made up of 4 magnetic poles, two fixed
Sub- iron core 6 forms magnetic bearing 8 magnetic poles of upper and lower ends, separately constitutes the magnetic pole of the positive negative direction of X, Y-axis, each stator core 6
Coil 9 is wound with magnetic pole, the inside of stator core 6 is internal rotor iron core 4, and the inside of internal rotor iron core 4 is internal rotor magnetic conductor 3,
Certain gap is left in internal rotor 4 outer surfaces of iron core with the inner surface of stator core 6, forms air gap 5, and the footpath of stator core 6 is outside
Portion is stator magnetic guiding loop 7, and a U-shaped passive part stator magnetic guiding loop 10 is between two stator cores 6, stator core 6 and U
There are two stator permanent magnets 8, the inner radial of U-shaped passive part stator magnetic guiding loop 10 between shape passive part stator magnetic guiding loop 10
For U-shaped passive part internal rotor magnetic guiding loop 1, in two between internal rotor magnetic conductor 3 and U-shaped passive part internal rotor magnetic guiding loop
Rotor permanent magnet 2, the outer surface of U-shaped passive part internal rotor magnetic guiding loop 1 and the inner surface of U-shaped passive part stator magnetic guiding loop 10
Between leave certain interval, form passive part air gap 11.
The magnetic pole of described each stator core 6 is wound with coil 9 as individually control, to realize magnetic bearing rotating part
Radial direction translation controls and radially reverses control, that is, realizes two translational degree of freedom control of the magnetic bearing rotating part along x and y directions
(totally four frees degree) is controlled with two torsional freedoms around x and y directions.
Described U-shaped passive part internal rotor magnetic guiding loop 1 and U-shaped passive part stator magnetic guiding loop 10 are by solid domain magnetic conduction
Material is made, and is realized by the axile displacement of U-shaped passive part internal rotor magnetic guiding loop 1 and U-shaped passive part stator magnetic guiding loop 10
The axial direction of magnetic bearing is stable (i.e. axial translational degree of freedom is passive).
In order to increase the rigidity of passive part, described U-shaped passive part internal rotor magnetic guiding loop 1 and U-shaped passive part are determined
The tooth of sub- magnetic guiding loop 10 is two, three or four, and wherein Fig. 4 gives U-shaped passive part internal rotor magnetic guiding loop and U-shaped is passive
The tooth of partial stator magnetic guiding loop is the internal rotor magnetic bearing sectional view of three.
In addition, in order to reduce the additional displacement negative stiffness that passive part is brought to active part, described passive part gas
The magnetic resistance of gap 11 is 2~4 times of the magnetic resistance of air gap 5.
It should be noted that if the present invention turns using in the passive part stator magnetic guiding loop and passive part of center section
Sub- magnetic guiding loop provide passive axial translation power and x to and y to radial direction twisting resistance, the stator core of active part only provides footpath
To the translation power in x directions and y directions, then the magnetic bearing can realize two translational degree of freedom controls.
U-shaped passive part internal rotor magnetic guiding loop 1, internal rotor magnetic conductor 3, stator used in the invention described above technical scheme are led
Magnet ring 7 and U-shaped passive part stator magnetic guiding loop 10 are solid construction, are made of the good material of magnetic property, such as electrician
Magnetic materials such as pure iron, various carbon steels, cast iron, cast steel, steel alloy, 1J50 and 1J79 etc..Stator core 6 and internal rotor iron core 4
The good material of the magnetic property such as magnetic such as electrical pure iron, electrical steel plate DR510, DR470, DW350,1J50 and 1J79 can be used
Material punching press, which folds, to be formed.The material of internal rotor permanent-magnetic body 2 and stator permanent magnet 8 is the good rare-earth permanent magnet of magnetic property, neodymium
Iron boron permanent magnet or ferrite permanent magnet, internal rotor permanent-magnetic body 2 and stator permanent magnet 8 are axial annulus, are magnetized vertically, and often
Individual internal rotor permanent-magnetic body 2 will ensure that volume is equal with each stator permanent magnet 8, the magnetizing direction of two neighboring stator permanent magnet 8
On the contrary, the magnetizing direction of two neighboring internal rotor permanent-magnetic body 2 is on the contrary, the stator permanent magnet 8 and internal rotor of magnetic bearing top half
The magnetizing direction of permanent magnet 2 is on the contrary, the stator permanent magnet 8 of magnetic bearing the latter half is opposite with the magnetizing direction of internal rotor permanent-magnetic body 2.Line
Circle 9 is formed using paint-dipping drying after the electromagnetic wire coiling of well conducting.Further, since magnetic field caused by permanent magnet passes through stator iron
Heart magnetic pole caused magnetic field in rotor core is size variation, therefore can produce eddy-current loss when rotor rotates at a high speed,
To reduce this partition losses, the magnetic pole of stator core 6 should use pole shoe form on the basis of shown in Fig. 2 at magnetic pole of the stator,
To reduce the eddy-current loss under high speed.
In addition, preferably, reduce the leakage field between passive part rotor magnetic guiding loop, turn in U-shaped passive part
The axial length of U-lag is designed as the tooth or U of internal rotor magnetic guiding loop 1 in sub- magnetic guiding loop 1 and U-shaped passive part stator magnetic guiding loop 10
4 times of the axial length of the tooth of shape passive part stator magnetic guiding loop 10；While in order to reduce the leakage field of stator/rotor permanent magnet body, U-shaped
Axial distance between passive part stator magnetic guiding loop 10 and stator core 6 is 3 times of the axial length of stator core 6.
The content not being described in detail in description of the invention belongs to prior art known to professional and technical personnel in the field.
Claims (3)
- A kind of 1. internal rotor magnetic bearing, it is characterised in that：By U-shaped passive part internal rotor magnetic guiding loop (1), internal rotor permanent-magnetic body (2), internal rotor magnetic conductor (3), internal rotor (4) unshakable in one's determination, air gap (5), stator core (6), stator magnetic guiding loop (7), stator permanent magnet Body (8), coil (9), U-shaped passive part stator magnetic guiding loop (10) and passive part air gap (11) composition, wherein each stator iron The heart (6) is made up of 4 magnetic poles, and two stator cores (6) form magnetic bearing 8 magnetic poles of upper and lower ends, and it is positive and negative to separately constitute X, Y-axis The magnetic pole in direction, is wound with coil (9) on the magnetic pole of each stator core (6), unshakable in one's determination for internal rotor inside stator core (6) (4), inside internal rotor (4) unshakable in one's determination it is internal rotor magnetic conductor (3), internal rotor iron core (4) outer surface and stator core (6) inner surface Leave certain gap, form air gap (5), the radially outer of stator core (6) is stator magnetic guiding loop (7), a U-shaped operand It is divided to stator magnetic guiding loop (10) between two stator cores (6), stator core (6) and U-shaped passive part stator magnetic guiding loop (10) there are two stator permanent magnets (8) between, the inner radial of U-shaped passive part stator magnetic guiding loop (10) is U-shaped passive part Internal rotor magnetic guiding loop (1), it is two internal rotor permanent-magnetics between internal rotor magnetic conductor (3) and U-shaped passive part internal rotor magnetic guiding loop Body (2), the outer surface of U-shaped passive part internal rotor magnetic guiding loop (1) and the inner surface of U-shaped passive part stator magnetic guiding loop (10) it Between leave certain interval, form passive part air gap (11), permanent magnetic circuit is two parts, and a part is：Magnetic flux is determined from upper end Sub- permanent magnet N poles are set out, by turning in stator magnetic guiding loop, upper end stator core, upper end air gap, upper end internal rotor iron core, upper end Sub- magnetic conductor, upper end internal rotor permanent-magnetic body, the tooth of upper end U-shaped passive part internal rotor magnetic guiding loop, upper end passive part air gap, on Tooth, the stator magnetic conduction of end U-shaped passive part stator magnetic guiding loop are looped back to the S poles of upper end stator permanent magnet；Part II is：Magnetic flux From lower end stator permanent magnet N poles, by stator magnetic guiding loop, lower end stator core, lower end air gap, lower end internal rotor it is unshakable in one's determination, Lower end internal rotor magnetic conductor, lower end internal rotor permanent-magnetic body, tooth, the lower end operand of lower end U-shaped passive part internal rotor magnetic guiding loop Air gap, tooth, the stator magnetic conduction of lower end U-shaped passive part stator magnetic guiding loop is divided to be looped back to the S poles of lower end stator permanent magnet；Described The magnetic pole of each stator core (6) is wound with coil (9) as individually control, to realize the radial direction translation control of magnetic bearing rotating part Make and radially reverse control, that is, realize that two translational degree of freedom of the magnetic bearing rotating part along x and y directions control and around x and y side To two torsional freedoms control, totally four frees degree, described independent control refers to that the electric current in each coil does not have Directly contact, be that the detection air gap change detected by power amplifier according to displacement transducer is led to each magnetic pole of the stator coil Electricity, realize magnetic bearing rotating part radial direction translation and radially twist, using centre U-shaped passive part stator magnetic guiding loop and U-shaped passive part internal rotor magnetic guiding loop realizes that the axial direction of magnetic bearing rotating part is put down by magnetic biasing pulling force caused by axial displacement It is dynamic；In order to reduce the leakage field between passive part rotor magnetic guiding loop, U-shaped passive part internal rotor magnetic guiding loop (1) and U-shaped are passive The axial length of U-lag is designed as the tooth or U-shaped passive part stator of internal rotor magnetic guiding loop (1) in partial stator magnetic guiding loop (10) 4 times of the axial length of the tooth of magnetic guiding loop (10)；While in order to reduce the leakage field of stator/rotor permanent magnet body, U-shaped passive part stator Axial distance between magnetic guiding loop (10) and stator core (6) is 3 times of stator core (6) axial length.
- 2. internal rotor magnetic bearing according to claim 1, it is characterised in that：Described each internal rotor permanent-magnetic body (2) and Each stator permanent magnet (8) is axial annulus, is magnetized vertically, and volume is equal.
- 3. internal rotor magnetic bearing according to claim 1, it is characterised in that：Described U-shaped passive part internal rotor magnetic conduction The tooth of ring (1) and U-shaped passive part stator magnetic guiding loop (10) is two, three or four.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410382326.5A CN104121290B (en) | 2014-08-06 | 2014-08-06 | A kind of internal rotor magnetic bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410382326.5A CN104121290B (en) | 2014-08-06 | 2014-08-06 | A kind of internal rotor magnetic bearing |
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| CN104121290A CN104121290A (en) | 2014-10-29 |
| CN104121290B true CN104121290B (en) | 2017-12-12 |
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| CN201410382326.5A Active CN104121290B (en) | 2014-08-06 | 2014-08-06 | A kind of internal rotor magnetic bearing |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3135933B1 (en) * | 2015-08-25 | 2019-05-01 | ReinHeart GmbH | Active magnetic bearing |
| CN108087424A (en) * | 2018-01-20 | 2018-05-29 | 营口万意达智能装备科技有限公司 | A kind of magnetic suspension swivel bearing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4024382B2 (en) * | 1998-05-15 | 2007-12-19 | 株式会社東芝 | Magnetic bearing device |
| JP2003199288A (en) * | 2001-12-28 | 2003-07-11 | Sankyo Seiki Mfg Co Ltd | Magnetically levitated motor and magnetic bearing device |
| CN1279291C (en) * | 2005-04-06 | 2006-10-11 | 北京航空航天大学 | Permanent magnet biased inner rotor radial magnetic bearing |
| CN100381720C (en) * | 2006-11-03 | 2008-04-16 | 北京航空航天大学 | Design method for permanent magnet bias inner rotor radial mixed magnetic bearing |
| JP5319069B2 (en) * | 2007-01-25 | 2013-10-16 | エドワーズ株式会社 | Electromagnetic actuator and vacuum pump |
| CN101696713B (en) * | 2009-10-15 | 2011-06-22 | 山东科技大学 | Radial magnetic bearing of low-power consumption inner rotor of permanent-magnetic up-attracting and down-repelling structure |
| CN101922510B (en) * | 2010-08-17 | 2014-04-23 | 北京航空航天大学 | Inner rotor permanent magnet biased radial magnetic bearing with double permanent magnets |
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Inventor after: Xu Weifeng Inventor after: Zhang Kai Inventor after: Wang Xiaoxiao Inventor after: Liu Jinjun Inventor after: Zhu Lifeng Inventor after: Ling Jun Inventor after: Wang Huaqiu Inventor after: Chen Xinan Inventor after: Yan Xiaofang Inventor after: Li Chenzhong Inventor after: Gao Fengyu Inventor before: Jia Xintao |
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Effective date of registration: 20171106 Address after: 323000 Lishui East Road, Liandu District, Zhejiang, No. 699 Applicant after: Lishui Power Supply Company of State Grid Zhejiang Power Supply Company Applicant after: STATE GRID ZHEJIANG QINGTIAN POWER SUPPLY CO., LTD. Address before: Zhu Shicun Bei wa Xiang 050500 in Hebei County of Lingshou Province Applicant before: Jia Xintao |
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