CN1752470A - Small volume low watt consumption permanent magnet offset external rotor radial magnetic bearing - Google Patents

Small volume low watt consumption permanent magnet offset external rotor radial magnetic bearing Download PDF

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Publication number
CN1752470A
CN1752470A CNA2005100868316A CN200510086831A CN1752470A CN 1752470 A CN1752470 A CN 1752470A CN A2005100868316 A CNA2005100868316 A CN A2005100868316A CN 200510086831 A CN200510086831 A CN 200510086831A CN 1752470 A CN1752470 A CN 1752470A
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CN
China
Prior art keywords
permanent magnet
magnetic bearing
magnetic
small volume
external rotor
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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.)
Granted
Application number
CNA2005100868316A
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Chinese (zh)
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CN1314908C (en
Inventor
房建成
孙津济
王曦
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Beihang University
Beijing University of Aeronautics and Astronautics
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Beihang University
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Priority to CNB2005100868316A priority Critical patent/CN1314908C/en
Publication of CN1752470A publication Critical patent/CN1752470A/en
Application granted granted Critical
Publication of CN1314908C publication Critical patent/CN1314908C/en
Expired - Fee Related legal-status Critical Current
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00Bearings not otherwise provided for
    • F16C32/04Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406Magnetic bearings
    • F16C32/044Active magnetic bearings
    • F16C32/0459Details of the magnetic circuit
    • F16C32/0461Details of the magnetic circuit of stationary parts of the magnetic circuit
    • F16C32/0465Details of the magnetic circuit of stationary parts of the magnetic circuit with permanent magnets provided in the magnetic circuit of the electromagnets
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00Bearings not otherwise provided for
    • F16C32/04Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406Magnetic bearings
    • F16C32/044Active magnetic bearings
    • F16C32/0474Active magnetic bearings for rotary movement
    • F16C32/048Active magnetic bearings for rotary movement with active support of two degrees of freedom, e.g. radial magnetic bearings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2300/00Application independent of particular apparatuses
    • F16C2300/20Application independent of particular apparatuses related to type of movement

Abstract

The present invention relates to a permanent magnet offset outer rotor radial magnetic bearing with small volume and low power consumption. It is composed of the following components: rotor iron core, four permanent-magnets, four stator iron cores and excitation coils. Said invention also provides their arrangement mode, between outer surface of stator iron core and inner surface of rotor iron core a certain gap is remained to form air gap, and between stator iron core and permanent magnet a second air gap is formed. The permanent-magnet utilizes adjacent two stator iron core magnet poles to form offset magnetic field on X and Y directions.

Description

A kind of small volume low watt consumption permanent magnet offset external rotor radial magnetic bearing
Affiliated technical field
The present invention relates to a kind of non-contact magnetically suspension bearing, particularly a kind of volume permanent magnet offset external rotor radial magnetic bearing little, low in energy consumption can be used as the contactless support of rotary component in the astrovehicles such as microminiature satellite.
Background technique
Magnetic suspension bearing divides pure electromagnetic type and permanent magnet bias to power up the hybrid magnetic suspension bearing of magnetic control system, the former uses, and electric current is big, power consumption is big, permanent magnet bias powers up the hybrid magnetic suspension bearing of magnetic control system, main bearing capacity is born in the magnetic field that permanent magnet produces, electromagnetism magnetic field provides auxiliary adjusting bearing capacity, thereby this bearing can reduce to control electric current greatly, reduces the wastage.But present permanent magnet offset external rotor radial magnetic bearing structure, some is on the basis of common radial magnetic bearing, on electromagnetic circuit to placing permanent magnet, the magnetic flux that control coil produced will pass permanent magnet like this, because the permanent magnet magnetic resistance is very big, thereby control coil will produce certain electromagnetism magnetic flux and need bigger exciting curent, and this obviously can increase the power consumption of bearing; Certain structures is that permanent magnet is directly linked to each other with stator lasmination is unshakable in one's determination, and permanent magnetic circuit can lose too much magnetomotive force when vertically passing stator core like this, thereby can weaken the suction of permanent magnet to rotor shaft greatly; Also some structure is that permanent magnet is linked to each other with laminated core by magnetic guiding loop, the electricity magnetic excitation circuit forms the loop through laminated core, the permanent magnetism magnetomotive force can not produce loss in laminated core like this, electric magnetic excitation circuit can not passed through permanent magnet itself yet simultaneously, but its plane, permanent magnetic circuit place of the radial direction magnetic bearing of this structure is vertical mutually with plane, electric magnetic excitation circuit place, thereby can cause axial length longer, so can not satisfy satellite, the desired volume of astrovehicles such as space station is little, lightweight order, as Chinese patent application number: the permanent magnet offset radial magnetic bearing of 200510086223.5 and 200510086213.1 structures, as depicted in figs. 1 and 2, its permanent magnetic circuit and electric magnetic excitation circuit are orthogonal, can accomplish that axial length is short, but the radial direction magnetic bearing of this structure is 8 stator core field structures, thereby weight, volume is relatively large, and it is littler to be used for volume requirement, weight requires lighter occasion.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, provide that a kind of volume is little, in light weight, low in energy consumption, a kind of small volume low watt consumption permanent magnet offset external rotor radial magnetic bearing of convenient processing and manufacture.
Technical solution of the present invention is: a kind of small volume low watt consumption permanent magnet offset external rotor radial magnetic bearing, by rotor core, permanent magnet, stator core, field coil is formed, 4 stator core magnetic poles are distributed on the circumference, wherein 4 permanent magnets are embedded in adjacent two stator core magnetic poles at interval, and be 90 degree and place, 4 stator core magnetic pole edge+X,-X, + Y and-the Y direction distributes, and be wound with field coil around it, stator core outer surface and rotor core internal surface leave the gap, form air gap, in order not make electric magnetic excitation circuit process permanent magnet itself to reduce loss, in design, make between permanent magnet and the stator core and form interstice, in order not make permanent magnet pass through the too much magnetomotive force of this air gap loss, thereby the length of interstice should be a bit larger tham calmly, between the rotor core 2 of air gap times, permanent magnet forms X by two adjacent stator core magnetic poles like this, bias magnetic field on the Y direction.
The principle of such scheme is: permanent magnet provides permanent magnet bias magnetic field to magnetic bearing, bear the suffered radial force of magnetic bearing, regulating action is played in the magnetic field that field coil produced, be used for changing the power in magnetic field on X, the Y direction, keep magnetic bearing rotor air gap even, and make rotor obtain contactless support.Shown in Fig. 1 solid arrow, permanent magnetic circuit of the present invention is: magnetic flux is from the permanent magnet N utmost point, by-directions X stator core magnetic pole ,-the directions X air gap is to rotor core, then process+Y direction air gap ,+the stator core magnetic pole of Y direction gets back to the permanent magnet S utmost point, forms the main magnetic circuit of magnetic suspension bearing; Shown in Fig. 1 dotted arrow, electricity magnetic excitation circuit path is: the stator core magnetic pole of electro-magnetic flux on the+Y direction, through interstice ,+X and-the stator core magnetic pole and the air gap of X both direction, transfer to iron core ,+air gap of Y direction gets back to+stator core magnetic pole on the Y direction, constitutes the closed-loop path.Guaranteed that so not only electric excitatory magnetic circuit is not by permanent magnet inside, reduced the magnetic resistance of electric excitatory magnetic circuit, reduced exciting curent, and then reduced the power consumption of bearing, make again simultaneously permanent magnetic circuit in arbitrary radial cross section with electric magnetic excitation circuit coplane, reduced axial dimension, and magnetic pole of the stator only needs 4, thereby reduced the weight and volume of radial direction magnetic bearing greatly.
The present invention's advantage compared with prior art is: the present invention is owing to adopt permanent magnetic field as bias magnetic field, compare with the traditional electrical magnetic bearing and to have eliminated the bias current that in coil current, accounts for fundamental component, reduced winding copper loss and the loss of control power amplifier, so power consumption is very low.Compare with existing permanent magnet biased magnetic bearing, its permanent magnetic circuit of permanent magnet offset external rotor radial magnetic bearing of the present invention and electric excitatory magnetic circuit coplane in arbitrary radial cross section, reduce the axial dimension of radial direction magnetic bearing, and this magnetic bearing only needs 4 stator core magnetic poles, thereby can further reduce the weight and volume of radial direction magnetic bearing.Particularly, small volume low watt consumption permanent magnet offset radial direction magnetic bearing of the present invention, adopt 4 stator core magnetic poles, permanent magnet is by the bias magnetic field on adjacent two stator core magnetic poles formation magnetic bearing X and the Y direction, the electricity magnetic excitation circuit forms the loop by the air gap between interstice and the stator and rotor, compare with accompanying drawing 1, reduced the weight of stator core, compare with accompanying drawing 2, not only reduced stator core weight, and coil quantity reduced one times, and this can reduce coil inductance, is beneficial to the control of magnetic bearing.
Description of drawings
Fig. 1 is a kind of existing permanent magnet offset external rotor radial magnetic bearing longitudinal section view;
Fig. 2 is another kind of existing permanent magnet offset external rotor radial magnetic bearing longitudinal section view;
Fig. 3 is a small volume low watt consumption permanent magnet offset external rotor radial magnetic bearing longitudinal section view of the present invention.
Embodiment
As shown in Figure 3, for the present invention is made up of rotor core 1, permanent magnet 2, stator core 3, field coil 5,4 stator core 3 magnetic pole edge+X ,-X ,+Y ,-the Y direction is distributed on the circumference of magnetic bearing, and be wound with field coil on every side, 4 permanent magnet 2 compartment of terrains are embedded in two adjacent stator cores 3, and are 90 degree distribution placements.For the installation and processing convenience, consider magnetically saturated factor simultaneously, distance between permanent magnet 2 and the stator core is 0.4-0.6mm, it is 0.2-0.4mm that stator core 3 outer surfaces and rotor core 1 internal surface leave certain clearance, form air gap 4, interstice between permanent magnet 2 and the stator core also should be a bit larger tham the length of 2 times of air gaps 4, and to reduce the magnetomotive loss of permanent magnet, permanent magnet 2 is by two adjacent stator core 3 magnetic poles formation X, the bias magnetic field on the Y direction.When concrete the application, permanent magnet offset external rotor radial magnetic bearing of the present invention should use in pairs.
Used rotor core 1, the stator core 3 of the present invention can form with magnetic property good electric thin steel sheet such as magnetic material punching presses such as electrical pure iron, electrical steel plate DR510, DR470, DW350,1J50,1J79 or the silicon steel thin belt system of changing; The material of permanent magnet 2 is good rare-earth permanent magnet of magnetic property or ferrite permanent magnet, and permanent magnet 2 is a parallel magnetization, and paint-dipping drying forms after the good electromagnetic wire coiling of field coil 5 usefulness conductions.

Claims (7)

1, small volume low watt consumption permanent magnet offset external rotor radial magnetic bearing, it is characterized in that: by rotor core (1), permanent magnet (2), stator core (3), field coil (5) is formed, 4 stator cores (3) magnetic pole is distributed on the circumference, wherein 4 permanent magnets (2) are embedded in adjacent two stator cores (3) magnetic pole at interval, and be 90 degree and place, 4 stator cores (3) magnetic pole edge+X,-X, + Y and-the Y direction distributes, and be wound with field coil (5) around it, stator core (3) outer surface and rotor core (1) internal surface leave the gap, form air gap (4), form interstice (6) between permanent magnet (2) and the stator core (3), and form X by adjacent two stator cores (3) magnetic pole, bias magnetic field on the Y direction.
2, small volume low watt consumption permanent magnet offset external rotor radial magnetic bearing according to claim 1 is characterized in that: described permanent magnet (2) is a parallel magnetization.
3, small volume low watt consumption permanent magnet offset external rotor radial magnetic bearing according to claim 1 is characterized in that: described stator core (3) is 0.4-0.6mm with the distance that embeds permanent magnet wherein.
4, small volume low watt consumption permanent magnet offset external rotor radial magnetic bearing according to claim 1 is characterized in that: the air gap (4) that described stator core (3) outer surface and rotor core (1) internal surface form is 0.2-0.4mm.
5, small volume low watt consumption permanent magnet offset external rotor radial magnetic bearing according to claim 1 is characterized in that: the length of described interstice (6) is greater than the length of 2 times of air gaps (4).
6, permanent magnet offset external rotor radial magnetic bearing according to claim 1 is characterized in that: described permanent magnet (2) adopts rare earth permanent-magnetic material or ferrite permanent-magnet materials to make.
7, small volume low watt consumption permanent magnet offset external rotor radial magnetic bearing according to claim 1 is characterized in that: described rotor core (1), stator core (3) are all adopted the punching press vertically of the good material of magnetic property repeatedly to make and are formed.
CNB2005100868316A 2005-11-10 2005-11-10 Small volume low watt consumption permanent magnet offset external rotor radial magnetic bearing Expired - Fee Related CN1314908C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB2005100868316A CN1314908C (en) 2005-11-10 2005-11-10 Small volume low watt consumption permanent magnet offset external rotor radial magnetic bearing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB2005100868316A CN1314908C (en) 2005-11-10 2005-11-10 Small volume low watt consumption permanent magnet offset external rotor radial magnetic bearing

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CN1752470A true CN1752470A (en) 2006-03-29
CN1314908C CN1314908C (en) 2007-05-09

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101158375B (en) * 2007-11-07 2010-06-02 南京航空航天大学 Low loss permanent magnetism bias radial direction magnetic bearing
CN101886668A (en) * 2010-07-09 2010-11-17 北京奇峰聚能科技有限公司 Double air-gap mixed outer rotor radial magnetic bearing
CN102032271A (en) * 2011-01-17 2011-04-27 鲁东大学 Radial bearing
CN103595152A (en) * 2013-10-28 2014-02-19 中国船舶重工集团公司第七〇七研究所 Low-loss and high-precision radial electromagnetic suspension bearing
CN103925292A (en) * 2014-03-25 2014-07-16 中国人民解放军海军工程大学 Permanent magnet polarization hybrid radial magnetic bearing
CN106812797A (en) * 2017-04-11 2017-06-09 华中科技大学 A kind of double layered stator permanent magnet offset radial magnetic bearing
CN106931035A (en) * 2017-04-20 2017-07-07 北京航空航天大学 A kind of spherical magnetic suspension bearing apparatus of permanent magnet bias low-power consumption

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101737425B (en) * 2010-01-21 2011-06-22 山东科技大学 Monostable radial magnetic bearing with low power consumption and zero gravity action

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5355042A (en) * 1988-09-09 1994-10-11 University Of Virginia Patent Foundation Magnetic bearings for pumps, compressors and other rotating machinery
US5825112A (en) * 1992-08-06 1998-10-20 Electric Power Research Institute, Inc. Doubly salient motor with stationary permanent magnets
US5578880A (en) * 1994-07-18 1996-11-26 General Electric Company Fault tolerant active magnetic bearing electric system
JP2001041238A (en) * 1999-07-28 2001-02-13 Seiko Seiki Co Ltd Composite type electromagnet and radial magnetic bearing
EP1247026B1 (en) * 1999-12-27 2009-09-02 LUST ANTRIEBSTECHNIK GmbH Magnetic bearing system
US20040256935A1 (en) * 2003-06-19 2004-12-23 Andrew Kenny Magnetic bearing with permanent magnet poles
JP2005061578A (en) * 2003-08-19 2005-03-10 Iwaki Co Ltd Magnetic bearing
CN1285840C (en) * 2005-05-09 2006-11-22 北京航空航天大学 Permanent magnetism biased radial magnetic bearing in external rotor

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101158375B (en) * 2007-11-07 2010-06-02 南京航空航天大学 Low loss permanent magnetism bias radial direction magnetic bearing
CN101886668A (en) * 2010-07-09 2010-11-17 北京奇峰聚能科技有限公司 Double air-gap mixed outer rotor radial magnetic bearing
CN102032271A (en) * 2011-01-17 2011-04-27 鲁东大学 Radial bearing
CN102032271B (en) * 2011-01-17 2012-08-22 鲁东大学 Radial bearing
CN103595152A (en) * 2013-10-28 2014-02-19 中国船舶重工集团公司第七〇七研究所 Low-loss and high-precision radial electromagnetic suspension bearing
CN103925292A (en) * 2014-03-25 2014-07-16 中国人民解放军海军工程大学 Permanent magnet polarization hybrid radial magnetic bearing
CN103925292B (en) * 2014-03-25 2016-06-29 中国人民解放军海军工程大学 A kind of permanent magnetic offset mixed radial magnetic bearing
CN106812797A (en) * 2017-04-11 2017-06-09 华中科技大学 A kind of double layered stator permanent magnet offset radial magnetic bearing
CN106931035A (en) * 2017-04-20 2017-07-07 北京航空航天大学 A kind of spherical magnetic suspension bearing apparatus of permanent magnet bias low-power consumption
CN106931035B (en) * 2017-04-20 2018-06-29 北京航空航天大学 A kind of permanent magnet bias low-power consumption spherical shape magnetic suspension bearing apparatus

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Termination date: 20181110