CN100491753C - Three degrees of freedom AC mixing magnetic bearing - Google Patents
Three degrees of freedom AC mixing magnetic bearing Download PDFInfo
- Publication number
- CN100491753C CN100491753C CNB2007100214142A CN200710021414A CN100491753C CN 100491753 C CN100491753 C CN 100491753C CN B2007100214142 A CNB2007100214142 A CN B2007100214142A CN 200710021414 A CN200710021414 A CN 200710021414A CN 100491753 C CN100491753 C CN 100491753C
- Authority
- CN
- China
- Prior art keywords
- rotor
- axial
- magnetic bearing
- stator
- aluminium flake
- 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.)
- Expired - Fee Related
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Classifications
-
- 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
- F16C32/0474—Active magnetic bearings for rotary movement
- F16C32/048—Active magnetic bearings for rotary movement with active support of two degrees of freedom, e.g. radial magnetic bearings
- F16C32/0482—Active magnetic bearings for rotary movement with active support of two degrees of freedom, e.g. radial magnetic bearings with three electromagnets to control the two degrees of freedom
-
- 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
- F16C32/0459—Details of the magnetic circuit
- F16C32/0461—Details of the magnetic circuit of stationary parts of the magnetic circuit
- F16C32/0465—Details of the magnetic circuit of stationary parts of the magnetic circuit with permanent magnets provided in the magnetic circuit of the electromagnets
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
The invention belongs to electrical transmission equipment field, particularly a new type three degrees of freedom alternating current hybrid magnetic bearing. An annular permanent magnet is employed to provide axial and radial static offset magnetic flux simultaneously. The three degrees of freedom alternating current hybrid magnetic bearing is consisted of a rotation shaft, rotor outboard aluminum sheet, rotor inboard aluminum sheet, axial stator outboard aluminum sheet, axial stator inboard aluminum sheet, annular permanent magnet, thin-sheet shaped axial stator, radial stator, radial winding and a rotor with a thin-sheet shaped end. One end of the rotor is a thin-sheet shaped structure used as an axial bearing, the rotor outboard aluminum sheet and the rotor inboard aluminum sheet are used to increase strength and fatherly reduce length-diameter ratio. Tripolar structure AC excitation is employed in radial direction, which provides control current by employing a triphase inverter. Aluminum sheets are used to increase strength and reduce length-diameter ratio in the invention, passive suspension is realized based on lamellate electric motor principle, which improves passive suspension ability. Axial spacing dimension occupied by the magnetic bearing is greatly reduced for that no excitation winding is needed.
Description
Technical field
The invention belongs to Electrified Transmission (mechanical transmission) apparatus field, refer in particular to a kind of novel three degrees of freedom AC mixing magnetic bearing, be suitable for the Three Degree Of Freedom suspension of all kinds of rotating machineries and support, belong to the technical field of electric drive control apparatus.
Background technique
At present, magnetic suspension bearing (abbreviation magnetic bearing) is according to the magnetic force presentation mode, is divided into three kinds of active magnetic bearings, passive-type magnetic bearing and hybrid magnetic bearings (permanent magnet bias).Hybrid magnetic bearing replaces the quiescent biasing magnetic field that electromagnet produces in the active magnetic bearings with the magnetic field that permanent magnet produces, and can reduce the power consumption of power amplifier greatly, and the Number of ampere turns of electromagnet is reduced, and dwindles the magnetic bearing volume, improves bearing load carrying capacity.Tradition direct current biasing type radial direction magnetic bearing mechanical structure is simple, but power loss is big; Though tradition permanent magnet bias type radial direction magnetic bearing power consumption decreases, structure is complicated again.
Three utmost point radial hybrid magnetic bearings domestic at present, foreign study combine the advantage of traditional permanent magnet bias type radial direction magnetic bearing and direct current biasing type radial direction magnetic bearing, adopt permanent magnet to replace bias direct current to provide bias magnetic to pass to static suspension power is provided, reduce power loss, dwindled electromagnet volume and winding space greatly; Adopt three-phase inverter that three utmost point control coils are carried out excitation and overcome transient load and disturbance, simplified control algorithm, reduced the power amplifier volume and the cost of magnetic bearing to produce the control magnetic flux.But axially and radially all need to control simultaneously, owing to also have DC excitation in the excitation control, thereby control is complicated, control performance is difficult to improve, and loss is also bigger.
In order to reduce the cost of production of magnetic bearing from structure, improve the service behaviour of magnetic bearing, enlarge the application of magnetic bearing, need to adopt some new cost of production, improve the service behaviour of magnetic bearing, enlarge the application of magnetic bearing, need to adopt some new mechanical structure and magnetic structures.
Summary of the invention
The objective of the invention is to propose simple and compact for structure, control is simple, it is low to control cost, thereby need to reduce the axial dimension of magnetic bearing supporting rotary main shaft, so that the critical speed of rotation of system is further enhanced, and reduce the volume and the cost of power amplifier greatly, and improve the control performance of magnetic bearing, make this type of magnetic bearing in suspension support systems such as breeze type wind-driven generator, magnetic suspension bearing-free motor, flywheel energy storage system and man-made satellite, to be used widely.
The solution of the present invention is: take an annular permanent magnet to provide simultaneously axially and quiescent biasing magnetic flux radially, by rotating shaft, rotor outside aluminium flake, the inboard aluminium flake of rotor, axial stator outside aluminium flake, axial stator inboard aluminium flake, annular permanent magnet, laminar axial stator, radial stator, radially winding, an end are that laminar rotor constitutes three degrees of freedom AC mixing magnetic bearing; Its rotor (6) thin slice end and rotor outside aluminium flake (21), the inboard aluminium flake of rotor (22) are closely linked, and laminar axial stator (41) and axial stator outside aluminium flake (23), the inboard aluminium flake of axial stator (24) are closely linked.Its rotor one end is the rotor that flake structure is used as axial magnetic bearing, and the inboard aluminium flake of use rotor outside aluminium flake and rotor is gained in strength and further reduced slenderness ratio, realizes Passive Control based on the thin-sheet motor principle, raising driven suspension ability; Radially adopt the three-stage structure AC excitation, radially adopt three-phase inverter that the control electric current is provided, it is little also less with coupling axially to need not excitation thereby loss, its axial driven suspension power is little than ACTIVE CONTROL, being fit to axially is not the occasion of basic load direction, consider present most of load radially, thereby have bigger applicability.
Adopt the DSP digital controller simultaneously displacement radially to be controlled in real time; By high-resolution current vortex sensor or Hall transducer the rotor radial position is detected, sensor carry-out bit shifting signal is to dsp system, the linear closed-loop controller compares its reference position signal, the fuzzy position controller is controlled, the output control signal realizes the three degrees of freedom AC mixing magnetic bearing closed loop control.
Advantage of the present invention is to adopt permanent magnet simultaneously to the biasing magnetic flux axially and radially is provided, and axially adopts flake structure, and the use aluminium flake is gained in strength and further reduced slenderness ratio, realizes driven suspension based on the thin-sheet motor principle, has improved the driven suspension ability; Need not exciting winding, radially adopt three-stage structure, AC excitation, thus reduced magnetic bearing axial occupation space size greatly; Adopt three-phase inverter to provide control control electric current to magnetic bearing radially simultaneously, reduced power amplifier ground quantity, control has simply reduced manufacturing and operating cost.
Description of drawings
Fig. 1 is three degrees of freedom AC mixing magnetic bearing three-dimensional cross-sectional figure.
Label title among Fig. 1: 1, rotating shaft.21, rotor outside aluminium flake.22, the inboard aluminium flake of rotor.23, stator outside aluminium flake.24, the inboard aluminium flake of stator.3, annular permanent magnet.41, axial stator.42, radial stator.5, three utmost points winding radially.6, rotor.
Fig. 2 is the three degrees of freedom AC mixing magnetic bearing schematic diagram
Fig. 2 (a) and Fig. 2 (b) be three degrees of freedom AC mixing magnetic bearing three utmost points radially with thin slice axial arrangement schematic representation.Fig. 2 (a) is three utmost point radial direction magnetic bearings, Φ among the figure
a, Φ
bAnd Φ
cBe respectively the magnetic flux that A, B and C axle winding produce, Φ
xAnd Φ
yBe respectively Φ
a, Φ
bAnd Φ
cEquivalent magnetic flux to x and y axle.i
a, i
bAnd i
cBe respectively A, B and C axle winding current, i
xAnd i
yBe x and y axle equivalent winding electric current.F
x, F
yBe respectively force in radial on x, the y axle direction.Fig. 2 (b) is passive axial magnetic bearing structural representation, Φ
zBe magnetic flux on the axial z direction, F
zBe the driven suspension power on the z direction.
Embodiment
Fig. 1 is of the present invention three free AC hybrid magnetic bearing three-dimensional structure schematic representation, stator among the figure is divided into axially and two parts radially, form by silicon steel plate stacking, it radially is three-stage structure, have three exciting winding, rotor thin slice end and axial stator part have added the mechanical strength that inside and outside two aluminium flakes improve the thin slice axial stator respectively, effectively reduce leakage field; Rotor axial partly has two aluminium flakes to improve the mechanical strength of axial rotor sheet segment for flake structure inside and outside same, reduces leakage field, further reduces the slenderness ratio of sheet segment simultaneously, improves the driven suspension ability.
Its working principle, as shown in Figure 2.In Fig. 2 (a), rotor is at magnetic flux Φ
a, Φ
bAnd Φ
cEffect is in the equilibrium position down, if rotor is subjected to the outer power effect deflection x postive direction of disturbing, then reduces magnetic flux Φ
xCan allow rotor get back to the equilibrium position.i
a, i
bAnd i
cBe respectively A, B and C axle winding current, i
xAnd i
yBe x and y axle equivalent winding electric current.Analyze as can be known, change x, y axle winding current i
x, i
ySize and Orientation can change F
x, F
ySize and Orientation, allow rotor get back to the equilibrium position.
Among Fig. 2 (b), the character that the axial length that axial driven suspension has utilized the thin-sheet motor rotor always has the trend that makes magnetic circuit magnetic resistance minimum than the much smaller structural feature of diameter and reluctance force.When rotor generation axial dipole field, magnetic pull always pulls to rotor the direction of magnetic resistance minimum and draws.When the ratio of the diameter of motor and axial length satisfied certain standard, in a single day rotor had the axial skew along z, according to the electromagnetism basic theories, all can be subjected to an electromagnetic attraction F opposite with its offset direction
zEffect, make its trend that has past equilibrium position to return, so rotor is along being passive stabilization on the z direction.Among Fig. 2 (b), the aluminium block enhance mechanical strength is adopted in rotor thin slice end both sides, has improved the diameter of motor and the ratio between the axial length, has improved axial passive displacement rigidity, improves the passive stabilization ability.
Claims (2)
1. three degrees of freedom AC mixing magnetic bearing, it is characterized in that this magnetic bearing by rotating shaft (1), rotor outside aluminium flake (21), the inboard aluminium flake (22) of rotor, axial stator outside aluminium flake (23), axial stator inboard aluminium flake (24), annular permanent magnet (3), laminar axial stator (41), radial stator (42), radially winding (5), an end are that laminar rotor (6) is formed to three utmost points; Its rotor (6) thin slice end and rotor outside aluminium flake (21), the inboard aluminium flake of rotor (22) are closely linked, and laminar axial stator (41) and axial stator outside aluminium flake (23), the inboard aluminium flake of axial stator (24) are closely linked.
2. three degrees of freedom AC mixing magnetic bearing according to claim 1 is characterized in that radial stator adopts three-stage structure, and excitation control electric current adopts and exchanges.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100214142A CN100491753C (en) | 2007-04-11 | 2007-04-11 | Three degrees of freedom AC mixing magnetic bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100214142A CN100491753C (en) | 2007-04-11 | 2007-04-11 | Three degrees of freedom AC mixing magnetic bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101038011A CN101038011A (en) | 2007-09-19 |
| CN100491753C true CN100491753C (en) | 2009-05-27 |
Family
ID=38889100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100214142A Expired - Fee Related CN100491753C (en) | 2007-04-11 | 2007-04-11 | Three degrees of freedom AC mixing magnetic bearing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100491753C (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101220832B (en) * | 2007-11-28 | 2010-06-09 | 江苏大学 | Radial-axial mixed magnetic bearing driven by radial quadrupole biphase alternating current |
| CN101666353B (en) * | 2009-09-23 | 2011-01-05 | 江苏大学 | Active magnetic bearing using bias magnetic flux commonly in radial direction and in axial direction and control method thereof |
| CN102121499B (en) * | 2011-03-23 | 2013-07-17 | 江苏大学 | Construction method for five-degree-of-freedom alternative current active magnetic bearing support vector machine decoupling controller |
| CN103195807B (en) * | 2013-03-27 | 2015-09-16 | 刘延风 | The Ampere force radial magnetic bearing of stator magnet field source and journal axle composite bearing thereof |
| CN103939466B (en) * | 2014-04-18 | 2016-06-15 | 江苏大学 | A kind of three degree of freedom magnetic axis holds |
| CN104410204B (en) * | 2014-11-28 | 2017-01-18 | 江苏大学 | Flywheel energy storage device |
| CN105391214B (en) * | 2015-11-05 | 2018-03-27 | 华中科技大学 | A kind of unified winding bearing-free motor and its driving control system |
| CN107387558B (en) * | 2017-07-27 | 2019-02-05 | 江苏大学 | A kind of vehicle-mounted flying wheel battery alternating current-direct current Three Degree Of Freedom axial direction monolithic hybrid magnetic bearing |
| CN107448475B (en) * | 2017-07-31 | 2019-06-11 | 北京航空航天大学 | A kind of Three Degree Of Freedom magnetic bearing and current vortex sensor integral structure |
| CN109268390A (en) * | 2018-11-26 | 2019-01-25 | 北京航空航天大学 | A kind of precision tracking bracket multi-coil axial magnetic bearing |
| CN109681527B (en) * | 2019-01-14 | 2020-05-19 | 南京航空航天大学 | Radial magnetic suspension bearing control method with redundancy function |
| CN113202869B (en) * | 2021-04-06 | 2023-08-22 | 南京邮电大学 | Three-degree-of-freedom hybrid bias magnetic bearing |
-
2007
- 2007-04-11 CN CNB2007100214142A patent/CN100491753C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101038011A (en) | 2007-09-19 |
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Granted publication date: 20090527 Termination date: 20120411 |