CN106438693A - Two-freedom-degree permanent magnet biased radial hybrid magnetic bearing - Google Patents
Two-freedom-degree permanent magnet biased radial hybrid magnetic bearing Download PDFInfo
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- CN106438693A CN106438693A CN201610971589.9A CN201610971589A CN106438693A CN 106438693 A CN106438693 A CN 106438693A CN 201610971589 A CN201610971589 A CN 201610971589A CN 106438693 A CN106438693 A CN 106438693A
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- permanent magnet
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
The invention discloses a two-freedom-degree permanent magnet biased radial hybrid magnetic bearing in the field of electric and mechanical transmission equipment. The two-freedom-degree permanent magnet biased radial hybrid magnetic bearing is characterized in that an annular stator core coaxially sleeves a rotor, 12 radially-protruding stator magnetic poles are arranged at the inner edge of the ring of the stator core and are evenly arranged along the circumferential direction, a radial groove is formed in each of the 6 stator magnetic poles which are not in two-two adjacency, a permanent magnet is placed in each radial groove, a control coil winds each of the 6 stator magnetic poles without the permanent magnets, and the 6 control coils are connected with an alternating-current power supply through a three-phase inverter; a radial gap is formed between each stator magnetic pole and the rotor; all the permanent magnets are magnetized radially, the N pole of each permanent magnet is located on the outer side, and the S pole of each permanent magnet is located on the inner side. The two-freedom-degree permanent magnet biased radial hybrid magnetic bearing has the advantages that the 6 radially-magnetized permanent magnets are used to provide static biased magnetic fields, the structure is simplified, the whole bearing is small in size and lightweight, and the critical rotation speed of the suspension rotor is increased.
Description
Technical field
The invention belongs to electrically and mechanically drive apparatus field, is related to a kind of on-mechanical contact bearing, refers in particular to a kind of permanent magnetism
Bias radial direction hybrid magnetic bearing, the contactless suspension as high-speed drive components such as fly wheel system, electrical spindle for machine tool, centrifuges is propped up
Hold.
Background technology
Permanent magnet offset radial hybrid magnetic bearing provides quiescent biasing magnetic magnetic flux by permanent magnet, provides control magnetic by direct current signal
Logical, have the advantages that control electric current, reduce loss can be reduced.But the hybrid magnetic bearing is due to adopting DC control, and
Amplidyne price height, volume is big, and a radial hybrid magnetic bearing generally needs four tunnel unipolarities or two-way bipolarity
Power amplification circuit, so that radial direction magnetic bearing volume is big, high cost, greatly limit its application.Existing radial direction two is freely
Degree magnetic bearing needs to take larger axial space, it is impossible to meet small volume required by magnetically levitated flywheel, gyro etc., lightweight
Requirement, and be unfavorable for the raising of critical rotor speed.In order to reduce the volume of magnetic bearing, reduce magnetic bearing power consumption and production
Cost, improves the service behaviour of magnetic bearing, expands the application of magnetic bearing, it is desirable to have a kind of new frame for movement and magnetic circuit knot
The permanent magnet offset radial hybrid magnetic bearing of structure.
China Patent Publication No. is CN201326646, entitled " a kind of Heteropolarity permanent magnetism bias axial and radial magnetic bearings "
Document in propose a kind of single flow radial direction two degrees of freedom outer rotor that radial stator is eight field structures being arranged symmetrically and mix
Magnetic bearing is closed, is controlled radially 2 degree of freedom using biplate ends of the earth same polarity magnetic axis bearing structure, need 4 tunnel unipolarities（Or 2 tunnels
Ambipolar）8 radial direction control coils of dc power amplifying circuit drive control, the magnetic bearing weight and volume of this structure is relatively
Greatly, small volume required by the spacecrafts such as magnetically levitated flywheel, lightweight purpose can not therefore be met.China Patent Publication No. is
CN1737388, proposes in the document of entitled " AC-DC radial-axial mixed magnetic bearing having three degrees of freedom and its control method "
Magnetic bearing is divided into axial stator and radial stator two parts, magnetic pole and rotor structure phase using the stator of one-piece construction, stator
To simple, have the disadvantage axial control coil and the limited space shared by radial direction control coil, cause magnetic bearing depression of bearing force, dissipate
Hot property is poor.
Content of the invention
The purpose of the present invention be for solving the problems, such as prior art, proposing a kind of compact conformation, power amplification circuit
Small volume, efficiency high, bearing capacity are big, while can be by the two degrees of freedom permanent magnet offset radial mixing magnetic of three-phase converter
Bearing, can reduce electro spindle or the various axial dimensions for needing suspension bearing live spindle, so that the critical speed of system is obtained
To improving further.
The technical solution used in the present invention is：The present invention includes rotating shaft, rotor and stator core, and rotor coaxial is enclosed within rotating shaft
Outward, the stator core of annular is coaxially cased with outside rotor, is provided with the stator of 12 radially protruding in the annulus inner edge of stator core
Magnetic pole, 12 magnetic pole of the stator are evenly distributed in the circumferential direction, wherein each stator magnet of non-conterminous 6 magnetic pole of the stator two-by-two
Radial slot being had respectively in the middle of extremely, place one piece of permanent magnet in each radial slot, is not placed with 6 magnetic pole of the stator of permanent magnet all
Coiling control coil, 6 control coils are all passed through a three-phase inverter and are connected with alternating current power supply；Between magnetic pole of the stator and rotor
Leave radial air gap；The equal radial magnetizing of all permanent magnets, N pole is in outside, and S pole is in inner side.
Further, 6 control coils are first, second, third, fourth, the five, the 6th controls along clockwise direction successively
Coil processed, the first control coil is connected with-the A of three-phase inverter, and the second control coil is connected with+the B of three-phase inverter,
3rd control coil is connected with-the C of three-phase inverter, relative the four, the five, the 6th control coils respectively with three-phase inversion
+ A the phase ,-B phase of device ,+C are connected correspondingly.
Compared with the prior art, the invention has the advantages that：
1st, the present invention shortens the axial length of rotor and the body of magnetic bearing by constructing a kind of brand-new magnetic circuit and frame for movement
Product, compared to common two degrees of freedom magnetic bearing and Simple Freedom Magnetic Bearing, the present invention substantially reduces the space chi of magnetic bearing
Very little；The present invention using 6 radial magnetizings square permanent magnet providing quiescent biasing magnetic field, shape between radial stator, rotor
Become closed-loop path, structure is simplified, make that whole bearing volume is less, weight is lighter, improves the critical speed of suspension rotor.?
Under equal-wattage or supporting force, axial length is greatly reduced；Or allow that system power under same volume does higher,
Suspending power can do more, and be particularly suited for use in the fields such as the Aero-Space such as magnetically levitated flywheel and military installations.
2nd, the present invention provides radial direction quiescent biasing magnetic flux by permanent magnet to produce static bearing capacity, by radial direction control coil institute
The control magnetic flux of offer makes rotor outstanding in radial direction two degrees of freedom producing dynamic suspension power and overcome external disturbance power and carrying
Float and be in poised state.The radial direction two degrees of freedom of the present invention does not use amplidyne and only with a three phase power
Inverter is driven control, needs 4 road power amplification circuits compared to conventional radial direction two degrees of freedom magnetic bearing, greatly reduces work(
The volume of rate amplifier and cost, reduce power attenuation, and control and more simplify.Three-phase inverter adopts dsp processor
It is controlled so that only needing to just can be easily by industrial universal frequency converter for magnetic bearing power by the programming of software
Amplifier, simple and reliable, reduce manufacture and operating cost.
3rd, the present invention is placed on square permanent magnet in magnetic pole of the stator, and the bias magnetic field for providing is symmetrical above and below, left and right phase
Deng when rotor is in an intermediate position, in the presence of bias magnetic field, it is possible to achieve stable suspension.
4th, the present invention is placed in control coil in stator disk, and the miscellaneous part of bearing is not take up its affiliated space, can
Enough spaces are provided for control coil, therefore can increase bearing capacity, perfect heat-dissipating.
Description of the drawings
Fig. 1 is a kind of structural front view of two degrees of freedom permanent magnet offset radial hybrid magnetic bearing of the present invention；
Fig. 2 is the magnetic flux schematic diagram of the present invention shown in Fig. 1；
In figure：1. permanent magnet；2. control coil；3. radial air gap；4. rotor；5. stator core；6. quiescent biasing magnetic flux；7. control
Magnetic flux processed；8. rotating shaft；11st, 12,13,14,15,16. permanent magnet；21st, 22,23,24,24,25,26. control coil.
Specific embodiment
As shown in figure 1, the present invention includes rotating shaft 8, rotor 4 and stator core 5, most middle is rotating shaft 8,4 coaxial sleeve of rotor
Outside rotating shaft 8, fix with rotating shaft 8 together with.Rotor 4 is formed by silicon steel plate stacking, in the outer stator for being coaxially cased with annular of rotor 4
Unshakable in one's determination 5, stator core 5 is processed using electrical pure iron.Stator core 5 is equal with the axial length of rotor 4.In stator core
5 annulus inner edge is provided with the magnetic pole of the stator of 12 radially protruding, and 12 magnetic pole of the stator are evenly distributed in the circumferential direction, and wherein two
Radial slot being had respectively in the middle of each magnetic pole of the stator of two non-conterminous 6 magnetic pole of the stator, places one block of permanent magnetism in each radial slot
Body 1, fixes permanent magnet 1 and is embedded in the radial slot of corresponding magnetic pole of the stator.6 permanent magnets 1, each two permanent magnetism are placed altogether
A magnetic pole of the stator for not being placed with permanent magnet 1 is spaced between body 1.6 permanent magnets 1 are permanent magnet along clockwise direction successively
11、12、13、14、15、16.Equal 2,6 control coils of coiling control coil on 6 magnetic pole of the stator for be not placed with permanent magnet 1
2 is control coil 21,22,23,24,24,25,26 along clockwise direction successively, and wherein, first permanent magnet 11 and second are forever
It is first control coil 21 between magnet 12.
The inner edge of permanent magnet 1 is identical with the inner edge of magnetic pole of the stator, and radian is fitted, both inner edge flush, permanent magnet 1
The inner edge flush of outer rim and stator core 5.Radial air gap 3, the size of radial air gap 3 is left between magnetic pole of the stator and rotor 4
For 0.3mm-0.5mm.
Permanent magnet 1 is made using rare-earth Nd-Fe-B, provides quiescent biasing magnetic flux.The axial length of all permanent magnets 1 with fixed
The axial length of son unshakable in one's determination 5 is equal, the equal radial magnetizing of all permanent magnets 1, N pole in outside, near stator core 5；Including S pole
Side, near rotor 4.
6 control coils 2 all connect a three-phase inverter, are connected with alternating current power supply by a three-phase inverter, use
To produce control magnetic flux.Wherein, control coil 21 is connected with-the A of three-phase inverter, control coil 22 and three-phase inverter
+ B is connected, and control coil 23 is connected with-C, relative control coil 24,25,26+A phase respectively with three-phase inverter ,-B
Phase ,+C are connected correspondingly.
As shown in Fig. 2 with the center of rotor 4 as initial point, with the center position of first permanent magnet 11 as Y-axis positive direction, X
Axle positive direction is perpendicular with Y-axis X-axis positive direction.It is energized to control coil 2 by three-phase inverter, quiescent biasing magnetic flux 6 is from forever
The N pole of magnet 11 is set out, and is divided into two-way, a road through stator core 5, the magnetic pole of the stator of coiling control coil 21, radial air gap 3,
The S pole of permanent magnet 11, the N pole of permanent magnet 11, form a closed-loop path；Another road is through stator core 5, coiling control coil 26
Magnetic pole of the stator, radial air gap 3, the S pole of permanent magnet 11, the N pole of permanent magnet 11, formed a closed-loop path, two-way magnetic flux structure
Become closed-loop path.Control magnetic flux 7 through stator core 5, two neighboring be wound with two magnetic pole of the stator of control coil, radial air gap 3,
Form a closed-loop path.Under at a time, the control magnetic flux 7 that B phase is passed through produced by electric current is quiet with what permanent magnet 1 was provided
State biasing magnetic flux 6 is superimposed, and-B is mutually passed through the quiescent biasing magnetic flux 6 that the control magnetic flux 7 produced by electric current is provided with permanent magnet 1
Offset, the suspending power along B phase pole orientation therefore can be produced, understand in the same manner, A, C phase can be also produced along A, C phase pole orientation
Suspending power, and decomposed by X, Y-direction and can draw the suspending power of X, Y-direction.The present invention is control coil using three-phase inverter
21st, 22,23,24,25,26 control electric current is provided, adjusts the size of bearing capacity at any time.By change control coil 21,22,23,
24th, the size of current in 25,26, adjusts the size of magnetic flux density at air gap 3, so that it may so adjust radial suspension force size and
Direction, overcomes external disturbance or load, realizes the stable suspersion of rotor 4.
Claims (5)
1. a kind of two degrees of freedom permanent magnet offset radial hybrid magnetic bearing, including rotating shaft（8）, rotor（4）And stator core（5）, turn
Son（4）Coaxial sleeve is in rotating shaft（8）Outward, rotor（4）The outer stator core for being coaxially cased with annular（5）, it is characterized in that：In stator ferrum
The heart（5）Annulus inner edge be provided with the magnetic pole of the stator of 12 radially protruding, 12 magnetic pole of the stator are evenly distributed in the circumferential direction, at which
In respectively have radial slot in the middle of each magnetic pole of the stator of non-conterminous 6 magnetic pole of the stator two-by-two, place one piece in each radial slot
Permanent magnet（1）, it is not placed with permanent magnet（1）6 magnetic pole of the stator on equal coiling control coils（2）, 6 control coils（2）All
It is connected with alternating current power supply by a three-phase inverter；Magnetic pole of the stator and rotor（4）Between leave radial air gap（3）；All forever
Magnet（1）Equal radial magnetizing, N pole is in outside, and S pole is in inner side.
2. a kind of two degrees of freedom permanent magnet offset radial hybrid magnetic bearing according to claim 1, is characterized in that：6 control lines
Circle（2）It is first, second, third, fourth, the five, the 6th control coils along clockwise direction successively, the first control coil and three
- the A of phase inverter is connected, and the second control coil is connected with+the B of three-phase inverter, the 3rd control coil and three-phase inversion
- the C of device is connected, relative the four, the five, the 6th control coils+A phase respectively with three-phase inverter ,-B phase, one a pair of+C
Ground is answered to be connected.
3. a kind of two degrees of freedom permanent magnet offset radial hybrid magnetic bearing according to claim 1, is characterized in that：Permanent magnet（1）
Inner edge and magnetic pole of the stator inner edge flush, permanent magnet（1）Outer rim and stator core（5）Inner edge flush.
4. a kind of two degrees of freedom permanent magnet offset radial hybrid magnetic bearing according to claim 1, is characterized in that：Radial air gap
（3）Size be 0.3mm-0.5mm.
5. a kind of two degrees of freedom permanent magnet offset radial hybrid magnetic bearing according to claim 1, is characterized in that：Permanent magnet（1）
Axial length and stator core（5）Axial length equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610971589.9A CN106438693A (en) | 2016-11-07 | 2016-11-07 | Two-freedom-degree permanent magnet biased radial hybrid magnetic bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610971589.9A CN106438693A (en) | 2016-11-07 | 2016-11-07 | Two-freedom-degree permanent magnet biased radial hybrid magnetic bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106438693A true CN106438693A (en) | 2017-02-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610971589.9A Pending CN106438693A (en) | 2016-11-07 | 2016-11-07 | Two-freedom-degree permanent magnet biased radial hybrid magnetic bearing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106438693A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111102293A (en) * | 2020-01-18 | 2020-05-05 | 湖南大学 | Active and passive magnetic-gas hybrid bearing |
| CN111425523A (en) * | 2020-02-28 | 2020-07-17 | 天津大学 | Hybrid radial permanent magnet biased magnetic bearing |
| CN113285558A (en) * | 2021-04-22 | 2021-08-20 | 东南大学 | Bias magnetic field adjustable force balance type stator permanent magnet motor magnetic bearing |
| CN113898669A (en) * | 2021-09-13 | 2022-01-07 | 南京航空航天大学 | Control method for independent differential magnetic pole pairs of radial magnetic suspension bearing |
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|---|---|---|---|---|
| US3984711A (en) * | 1975-04-07 | 1976-10-05 | Warner Electric Brake & Clutch Company | Variable reluctance step motor with permanent magnets |
| US20030001447A1 (en) * | 1999-12-27 | 2003-01-02 | Siegfried Silber | Magnetic bearing system |
| CN1730961A (en) * | 2005-08-11 | 2006-02-08 | 北京航空航天大学 | Permanent magnet biased external rotor radial magnetic bearing |
| CN101392794A (en) * | 2008-10-24 | 2009-03-25 | 江苏大学 | Permanent magnet external rotor mixed magnetic bearing |
| EP2715920A2 (en) * | 2011-05-31 | 2014-04-09 | Johannes Kepler Universität Linz | Electric machine having a magnetically supported reluctance rotor |
| CN206221508U (en) * | 2016-11-07 | 2017-06-06 | 江苏大学 | A kind of two degrees of freedom permanent magnet offset radial hybrid magnetic bearing |
-
2016
- 2016-11-07 CN CN201610971589.9A patent/CN106438693A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3984711A (en) * | 1975-04-07 | 1976-10-05 | Warner Electric Brake & Clutch Company | Variable reluctance step motor with permanent magnets |
| US20030001447A1 (en) * | 1999-12-27 | 2003-01-02 | Siegfried Silber | Magnetic bearing system |
| CN1730961A (en) * | 2005-08-11 | 2006-02-08 | 北京航空航天大学 | Permanent magnet biased external rotor radial magnetic bearing |
| CN101392794A (en) * | 2008-10-24 | 2009-03-25 | 江苏大学 | Permanent magnet external rotor mixed magnetic bearing |
| EP2715920A2 (en) * | 2011-05-31 | 2014-04-09 | Johannes Kepler Universität Linz | Electric machine having a magnetically supported reluctance rotor |
| CN206221508U (en) * | 2016-11-07 | 2017-06-06 | 江苏大学 | A kind of two degrees of freedom permanent magnet offset radial hybrid magnetic bearing |
Non-Patent Citations (2)
| Title |
|---|
| 徐锋等主编: "《电机与电器控制》", 30 September 2014 * |
| 谢志意等: "三相径向混合磁轴承的结构设计与磁路分析", 《机械与电子》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111102293A (en) * | 2020-01-18 | 2020-05-05 | 湖南大学 | Active and passive magnetic-gas hybrid bearing |
| CN111425523A (en) * | 2020-02-28 | 2020-07-17 | 天津大学 | Hybrid radial permanent magnet biased magnetic bearing |
| CN113285558A (en) * | 2021-04-22 | 2021-08-20 | 东南大学 | Bias magnetic field adjustable force balance type stator permanent magnet motor magnetic bearing |
| CN113285558B (en) * | 2021-04-22 | 2022-04-29 | 东南大学 | Bias magnetic field adjustable force balance type stator permanent magnet motor magnetic bearing |
| CN113898669A (en) * | 2021-09-13 | 2022-01-07 | 南京航空航天大学 | Control method for independent differential magnetic pole pairs of radial magnetic suspension bearing |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170222 |
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| RJ01 | Rejection of invention patent application after publication |