CN104214217A - Four-degree-of-freedom outer rotor magnetic bearing - Google Patents
Four-degree-of-freedom outer rotor magnetic bearing Download PDFInfo
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- CN104214217A CN104214217A CN201410383870.1A CN201410383870A CN104214217A CN 104214217 A CN104214217 A CN 104214217A CN 201410383870 A CN201410383870 A CN 201410383870A CN 104214217 A CN104214217 A CN 104214217A
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- external rotor
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Abstract
The invention discloses a four-degree-of-freedom outer rotor magnetic bearing. The four-degree-of-freedom outer rotor magnetic bearing consists of driven part outer rotor magnetic conducting rings, an outer rotor permanent magnet, outer rotor magnetic conducting bodies, outer rotor iron cores, air gaps, stator iron cores, a stator magnetic conducting ring, stator permanent magnets, a coil, driven part stator magnetic conducting rings and driven part air gaps, wherein each of the stator iron cores consists of four magnetic poles forming magnetic poles in the positive and negative directions of X and Y axles; certain gaps are left between the inner surfaces of the outer rotor iron cores and the outer surfaces of the stator iron cores, and form the air gaps; the two driven part stator magnetic conducting rings are positioned between the two stator iron cores; two stator permanent magnets are arranged between the stator iron cores and the driven part stator magnetic conducting rings; a stator permanent magnet is arranged between the two driven part stator magnetic conducting rings; the outer rotor permanent magnet is arranged between the two outer rotor magnetic conducting bodies; and the driven part air gaps are formed between the inner surfaces of the driven part outer rotor magnetic conducting rings and the outer surfaces of the driven part stator magnetic conducting rings. The four-degree-of-freedom outer rotor magnetic bearing has the characteristics of small size and easy assembly and disassembly.
Description
Technical field
The present invention relates to a kind of non-contact magnetically suspension bearing, particularly a kind of four-degree-of-freedom external rotor magnetic bearing, can be used as the contactless support of the rotary component such as space single-gimbal control momentum gyro and two framework control-moment gyros.
Background technique
Magnetic suspension bearing divides pure electromagnetic type and permanent magnet bias to add the hybrid magnetic suspension bearing of Electromagnetic Control, the former uses electric current large, power consumption is large, permanent magnet bias adds the hybrid magnetic suspension bearing of Electromagnetic Control, the bias current utilizing permanent magnet to substitute in pure electromagnetism magnetic bearing produces bias magnetic field, main bearing capacity is born in the magnetic field that permanent magnet produces, electromagnetism magnetic field provides auxiliary adjustment bearing capacity, thus this bearing can reduce to control electric current greatly, there is the loss reducing power amplifier, reduce magnetic bearing Number of ampere turns, reduce magnetic bearing volume, improve the advantages such as bearing load carrying capacity, therefore permanent magnet biased magnetic bearing is at magnetic suspension motor, high speed flywheel system, the high-speed motion occasion of the magnetic suspension bearings such as control-moment gyro system is widely used.Space magnetic suspension control torque gyroscope adopts magnetic bearing supporting, owing to overcoming the problems such as the friction of conventional mechanical bearings control-moment gyro and unbalance vibration, therefore can realize higher rotating speed, longer life-span and higher output torque precision.Existing magnetic suspension control torque gyroscope is in order to improve output torque size, the full magnetic bearing configuration initiatively of usual employing five degree of freedom, but the control of the magnetic suspension control torque gyroscope of this structure owing to adopting electric current to realize output torque, therefore power consumption is large, volume is large, complex circuit, although and with the two-freedom magnetic suspension control torque gyroscope of passive magnetic bearing output torque can volume do very little, but because passive magnetic bearing is uncontrollable, therefore there is damping low, the defect of poor stability, in addition, influence each other between existing four-degree-of-freedom magnetic bearing active part rigidity and passive part rigidity, the control difficulty of control system can be increased.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, provides a kind of four-degree-of-freedom external rotor magnetic bearing, to reduce own vol weight and power consumption.
Technical solution of the present invention is: a kind of four-degree-of-freedom external rotor magnetic bearing, by passive part external rotor magnetic guiding loop, outer rotor permanent magnet, external rotor magnet case, external rotor is unshakable in one's determination, air gap, stator core, stator magnetic guiding loop, stator permanent magnet, coil, passive part stator magnetic guiding loop and passive part air gap composition, wherein each stator core is made up of 4 magnetic poles, two stator core composition magnetic bearing 8, upper and lower two ends magnetic poles, form X respectively, the magnetic pole of the positive negative direction of Y-axis, the magnetic pole of each stator core is wound with coil, stator core outside is that external rotor is unshakable in one's determination, external rotor core profile is external rotor magnet case, external rotor internal surface unshakable in one's determination and stator core outer surface leave certain gap, form air gap, the inner radial of stator core is stator magnetic guiding loop, two passive part stator magnetic guiding loops are between two stator cores, two stator permanent magnets are had between stator core and passive part stator magnetic guiding loop, a stator permanent magnet is had between two passive part stator magnetic guiding loops, the radially outer of passive part stator magnetic guiding loop is passive part external rotor magnetic guiding loop, be outer rotor permanent magnet between two external rotor magnet cases, certain interval is left between the internal surface of passive part external rotor magnetic guiding loop and the outer surface of passive part stator magnetic guiding loop, form passive part air gap.
The magnetic pole of described each stator core is wound with coil and controls for independent.
Described outer rotor permanent magnet and each stator permanent magnet are axial annulus, magnetize vertically, and volume are equal.
The magnetic pole of described stator core adopts pole shoe form.
Described passive part external rotor magnetic guiding loop and passive part stator magnetic guiding loop are made up of solid domain permeability magnetic material.
Described passive part external rotor magnetic guiding loop and passive part stator magnetic guiding loop are two, four, six or eight.
The magnetic resistance of described passive part air gap is 2 ~ 4 times of air-gap reluctance.
The principle of such scheme is: four-degree-of-freedom external rotor magnetic bearing, by controlling coil (the i.e. independent electric current controlled in each coil of upper and lower two groups of stator core magnetic poles, that is, " independent control " electric current referred in each coil is not contacted directly, that the detection air gap change detected according to displacement transducer by power amplifier is energized to each magnetic pole of the stator coil), realize the radial translation of magnetic bearing rotating part and radial twisting, stator magnetic guiding loop and the passive part external rotor magnetic guiding loop of the passive part in the middle of utilizing realize the axial translation of magnetic bearing rotating part by the magnetic biasing pulling force that axial displacement produces.Stator permanent magnet and outer rotor permanent magnet provide permanent magnet bias magnetic field to magnetic bearing, bear the radial force suffered by magnetic bearing, the magnetic field that coil produces plays regulatory role, and is used for changing the power often extremely descending magnetic field, keep magnetic bearing rotor air gap even, and make rotor obtain contactless support.Permanent magnetic circuit of the present invention is three parts (as shown in Figure 3), a part is: magnetic flux, from stator permanent magnet N pole, upper end, gets back to the S pole of upper end stator permanent magnet by stator magnetic guiding loop, upper end stator core, upper end air gap, upper end external rotor iron core, upper end external rotor magnet case, upper end passive part external rotor magnetic guiding loop, upper end passive part air gap, upper end passive part stator magnetic guiding loop, stator magnetic guiding loop; Second portion is: magnetic flux, from stator permanent magnet N pole, lower end, gets back to the S pole of lower end stator permanent magnet by stator magnetic guiding loop, lower end passive part stator magnetic guiding loop, lower end passive part air gap, lower end passive part external rotor magnetic guiding loop, lower end external rotor magnet case, lower end external rotor iron core, lower end air gap, lower end stator core, stator magnetic guiding loop; Part III is: magnetic flux is from the stator permanent magnet N pole of centre, by stator magnetic guiding loop, lower end passive part stator magnetic guiding loop, lower end passive part air gap, lower end passive part external rotor magnetic guiding loop, lower end external rotor magnet case, outer rotor permanent magnet S pole, outer rotor permanent magnet N pole, upper end external rotor magnet case, upper end passive part external rotor magnetic guiding loop, upper end passive part air gap, upper end passive part stator magnetic guiding loop, stator magnetic guiding loop, get back to the S pole of intermediate stator permanent magnet.As shown in Figure 2, for the magnetic flux that certain end Y-axis postive direction coil current produces, its path is: the Y-axis postive direction magnetic pole that stator core is formed, Y-axis postive direction air gap be unshakable in one's determination to external rotor, then arrive other three direction air gaps, other three direction magnetic poles that stator core is formed, the Y-axis postive direction magnetic pole of getting back to stator core formation, formation closed-loop path.
The present invention's advantage is compared with prior art: the present invention utilizes stator core to provide radial force and the gyrostatic moment of four-degree-of-freedom, and control accuracy is high, and axial translational degree of freedom is passive realization, and low in energy consumption, volume is little; Each stator permanent magnet of the present invention is identical with outer rotor permanent magnet volume, magnetic bearing residual magnetic moment can be made close to zero, meet the requirement of space flight; Outer rotor permanent magnet of the present invention only for increasing axial translation by dynamic stiffness, on stator core section without impact, active part can be made very little to the stiffness effect of passive part; In addition, axial passive part of the present invention is domain structure, and magnetic fluctuation is little, rotates power consumption little.
Accompanying drawing explanation
Fig. 1 is four-degree-of-freedom external rotor magnetic bearing axial sectional view of the present invention;
Fig. 2 is four-degree-of-freedom external rotor magnetic bearing axial end view drawing of the present invention; Wherein Fig. 2 a is the end view drawing of pole shoe form, the end view drawing that Fig. 2 b is magnetic pole of the stator angle when being 62 degree;
Fig. 3 is the permanent magnetic circuit figure of four-degree-of-freedom external rotor magnetic bearing of the present invention;
Fig. 4 is the four-degree-of-freedom external rotor magnetic bearing axial sectional view containing four passive part external rotor magnetic guiding loops and passive part stator magnetic guiding loop of the present invention.
Embodiment
As shown in Figure 1, a kind of four-degree-of-freedom external rotor magnetic bearing, by passive part external rotor magnetic guiding loop 1, outer rotor permanent magnet 2, external rotor magnet case 3, external rotor iron core 4, air gap 5, stator core 6, stator magnetic guiding loop 7, stator permanent magnet 8, coil 9, passive part 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 stator cores 6 form magnetic bearing 8, upper and lower two ends magnetic pole, form X respectively, the magnetic pole of the positive negative direction of Y-axis, the magnetic pole of each stator core 6 is wound with coil 9, stator core 6 outside is external rotor iron core 4, external rotor 4 outsides unshakable in one's determination are external rotor magnet case 3, external rotor 4 internal surfaces unshakable in one's determination and stator core 6 outer surface leave certain gap, form air gap 5, the inner radial of stator core 6 is stator magnetic guiding loop 7, two passive part stator magnetic guiding loops 10 are between two stator cores 6, two stator permanent magnets 8 are had between stator core 6 and passive part stator magnetic guiding loop 10, a stator permanent magnet 8 is had between two passive part stator magnetic guiding loops 10, the radially outer of passive part stator magnetic guiding loop 10 is passive part external rotor magnetic guiding loop 1, be outer rotor permanent magnet 2 between two external rotor magnet cases 3, certain interval is left between the internal surface of passive part external rotor magnetic guiding loop 1 and the outer surface of passive part stator magnetic guiding loop 7, form passive part air gap 11.
The magnetic pole of described each stator core 6 is wound with coil 9 and controls for independent, control with radial torsion with the radial translation control realizing magnetic bearing rotating part, namely realize magnetic bearing rotating part along two translational degree of freedom controls in x and y direction and two torsional freedoms control (totally four degrees of freedom) around x and y direction.
Described passive part external rotor magnetic guiding loop 1 and passive part stator magnetic guiding loop 10 are made up of solid domain permeability magnetic material, are realized the axis stable (namely axial translational degree of freedom is passive) of magnetic bearing by the axile displacement of passive part external rotor magnetic guiding loop 1 and passive part stator magnetic guiding loop 10.
In order to increase the rigidity of passive part, described passive part external rotor magnetic guiding loop 1 and passive part stator magnetic guiding loop 10 are two, four, six or eight, and wherein Fig. 4 gives the external rotor four-degree-of-freedom magnetic bearing sectional view that passive part external rotor magnetic guiding loop and passive part stator magnetic guiding loop are four.
In addition, in order to reduce the additional displacement negative stiffness that passive part is brought active part, the magnetic resistance of described passive part air gap 11 is 2 ~ 4 times of air gap 5 magnetic resistance.
The invention described above technological scheme passive part external rotor magnetic guiding loop 1, external rotor magnet case 3, stator magnetic guiding loop 7 and passive part stator magnetic guiding loop 10 used is solid construction, the good material of magnetic property is adopted to make, as magnetic materials etc. such as electrical pure iron, various carbon steel, cast iron, cast steel, alloyed steel, 1J50 and 1J79.Stator core 6 and external rotor iron core 4 can form as the magnetic material punching presses such as electrical pure iron, electrical steel plate DR510, DR470, DW350,1J50 and 1J79 fold with the material that magnetic property is good.The material of outer rotor permanent magnet 2 and stator permanent magnet 8 is rare-earth permanent magnet, Nd-Fe-B permanent magnet or ferrite permanent magnet that magnetic property is good, outer rotor permanent magnet 2 and stator permanent magnet 8 are axial annulus, magnetize vertically, and outer rotor permanent magnet 2 and each stator permanent magnet 8 will ensure that volume is equal, the magnetizing direction of adjacent stators permanent magnet 8 is contrary, and the magnetizing direction of the stator permanent magnet 8 between passive part stator magnetic guiding loop is contrary with the magnetizing direction of the outer rotor permanent magnet 2 between passive part external rotor magnetic guiding loop.After coil 9 adopts the good electromagnetic wire coiling of conduction, paint-dipping drying forms.In addition, the magnetic field produced due to permanent magnet is size variation by the magnetic field produced in the rotor core outside of stator core magnetic pole, therefore eddy current loss can be produced when rotor high-speed rotates, for reducing this part loss, the magnetic pole of stator core 6 should adopt pole shoe form (as shown in Figure 2 a) to reduce the eddy current loss at a high speed.In addition, problem excessive during the magnetic caused in order to the acute angle reduced in Fig. 2 a between stator core magnetic pole root and stator core yoke portion is intensive, the stator core end view drawing provided in Fig. 2 b can be adopted, central angle corresponding to the stator core magnetic pole both sides provided in figure is 62 degree, this structure can effectively reduce magnetic that the acute angle between stator core magnetic pole root and stator core yoke portion causes intensive in.
The content be not described in detail in specification of the present invention belongs to the known prior art of professional and technical personnel in the field.
Claims (7)
1. a four-degree-of-freedom external rotor magnetic bearing, it is characterized in that: by passive part external rotor magnetic guiding loop (1), outer rotor permanent magnet (2), external rotor magnet case (3), external rotor iron core (4), air gap (5), stator core (6), stator magnetic guiding loop (7), stator permanent magnet (8), coil (9), passive part stator magnetic guiding loop (10) and passive part air gap (11) composition, wherein each stator core (6) is made up of 4 magnetic poles, two stator core (6) composition magnetic bearing 8, upper and lower two ends magnetic poles, form X respectively, the magnetic pole of the positive negative direction of Y-axis, the magnetic pole of each stator core (6) is wound with coil (9), stator core (6) outside is external rotor iron core (4), external rotor iron core (4) outside is external rotor magnet case (3), external rotor iron core (4) internal surface and stator core (6) outer surface leave certain gap, form air gap (5), the inner radial of stator core (6) is stator magnetic guiding loop (7), two passive part stator magnetic guiding loops (10) are positioned between two stator cores (6), two stator permanent magnets (8) are had between stator core (6) and passive part stator magnetic guiding loop (10), a stator permanent magnet (8) is had between two passive part stator magnetic guiding loops (10), the radially outer of passive part stator magnetic guiding loop (10) is passive part external rotor magnetic guiding loop (1), be outer rotor permanent magnet (2) between two external rotor magnet cases (3), certain interval is left between the internal surface of passive part external rotor magnetic guiding loop (1) and the outer surface of passive part stator magnetic guiding loop (7), form passive part air gap (11).
2. four-degree-of-freedom external rotor magnetic bearing according to claim 1, is characterized in that: the magnetic pole of described each stator core (6) is wound with coil (9) and controls for independent.
3. four-degree-of-freedom external rotor magnetic bearing according to claim 1, is characterized in that: described outer rotor permanent magnet (2) and each stator permanent magnet (8) are axial annulus, magnetize vertically, and volume are equal.
4. four-degree-of-freedom external rotor magnetic bearing according to claim 1, is characterized in that: the magnetic pole of described stator core (6) adopts pole shoe form.
5. four-degree-of-freedom external rotor magnetic bearing according to claim 1, is characterized in that: described passive part external rotor magnetic guiding loop (1) and passive part stator magnetic guiding loop (10) are made up of solid domain permeability magnetic material.
6. four-degree-of-freedom external rotor magnetic bearing according to claim 1, is characterized in that: described passive part external rotor magnetic guiding loop (1) and passive part stator magnetic guiding loop (10) are two, four, six or eight.
7. four-degree-of-freedom external rotor magnetic bearing according to claim 1, is characterized in that: the magnetic resistance of described passive part air gap (11) is 2 ~ 4 times of air gap (5) magnetic resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410383870.1A CN104214217B (en) | 2014-08-06 | 2014-08-06 | Four-degree-of-freedom outer rotor magnetic bearing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410383870.1A CN104214217B (en) | 2014-08-06 | 2014-08-06 | Four-degree-of-freedom outer rotor magnetic bearing |
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| Publication Number | Publication Date |
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| CN104214217A true CN104214217A (en) | 2014-12-17 |
| CN104214217B CN104214217B (en) | 2017-02-15 |
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| CN201410383870.1A Active CN104214217B (en) | 2014-08-06 | 2014-08-06 | Four-degree-of-freedom outer rotor magnetic bearing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104533948A (en) * | 2015-01-13 | 2015-04-22 | 北京航空航天大学 | Permanent magnet biased outer rotor four-freedom-degree active-passive hybrid magnetic bearing |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0664410A1 (en) * | 1994-01-19 | 1995-07-26 | Alcatel Cit | Magnetic bearing and an assembly composed of a stator and a rotor suspended by such a bearing |
| CN101696713A (en) * | 2009-10-15 | 2010-04-21 | 山东科技大学 | Radial magnetic bearing of low-power consumption inner rotor of permanent-magnetic up-attracting and down-repelling structure |
| CN101769335A (en) * | 2010-01-26 | 2010-07-07 | 山东科技大学 | Low power-consumption hybrid magnetic bearing with permanent-magnetic upper attracting and lower repelling structure |
| CN201747782U (en) * | 2010-05-24 | 2011-02-16 | 山东科技大学 | Low power consumption single-steady-state zero-gravity action radial magnetic bearing |
-
2014
- 2014-08-06 CN CN201410383870.1A patent/CN104214217B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0664410A1 (en) * | 1994-01-19 | 1995-07-26 | Alcatel Cit | Magnetic bearing and an assembly composed of a stator and a rotor suspended by such a bearing |
| CN101696713A (en) * | 2009-10-15 | 2010-04-21 | 山东科技大学 | Radial magnetic bearing of low-power consumption inner rotor of permanent-magnetic up-attracting and down-repelling structure |
| CN101769335A (en) * | 2010-01-26 | 2010-07-07 | 山东科技大学 | Low power-consumption hybrid magnetic bearing with permanent-magnetic upper attracting and lower repelling structure |
| CN201747782U (en) * | 2010-05-24 | 2011-02-16 | 山东科技大学 | Low power consumption single-steady-state zero-gravity action radial magnetic bearing |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104533948A (en) * | 2015-01-13 | 2015-04-22 | 北京航空航天大学 | Permanent magnet biased outer rotor four-freedom-degree active-passive hybrid magnetic bearing |
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| CN104214217B (en) | 2017-02-15 |
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