CN1285840C - Permanent magnetism biased radial magnetic bearing in external rotor - Google Patents

Permanent magnetism biased radial magnetic bearing in external rotor Download PDF

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Publication number
CN1285840C
CN1285840C CNB2005100116901A CN200510011690A CN1285840C CN 1285840 C CN1285840 C CN 1285840C CN B2005100116901 A CNB2005100116901 A CN B2005100116901A CN 200510011690 A CN200510011690 A CN 200510011690A CN 1285840 C CN1285840 C CN 1285840C
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CN
China
Prior art keywords
magnetic
permanent magnet
stator
magnet
core
Prior art date
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Expired - Fee Related
Application number
CNB2005100116901A
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Chinese (zh)
Other versions
CN1687607A (en
Inventor
孙津济
房建成
马善振
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Beihang University
Beijing University of Aeronautics and Astronautics
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Beihang University
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Priority to CNB2005100116901A priority Critical patent/CN1285840C/en
Publication of CN1687607A publication Critical patent/CN1687607A/en
Application granted granted Critical
Publication of CN1285840C publication Critical patent/CN1285840C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F16C2300/00Application independent of particular apparatuses
    • F16C2300/20Application independent of particular apparatuses related to type of movement
    • 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
    • F16C32/0487Active magnetic bearings for rotary movement with active support of four degrees of freedom

Abstract

The present invention relates to a permanent magnet biased radial magnetic bearing with an external rotor, which is composed of external magnetic conductive rings, a permanent magnet, stator cores, an internal magnetic isolating body, excitation coils, internal magnetic conductive bodies and rotor cores, wherein four stator magnetic poles in the positive and negative directions of X and Y are formed by the four stator cores which are connected with through the internal magnetic conductive body and the internal magnetic isolating body, and eight magnetic poles at the left side and the right side of the magnetic bearing are formed by the eight stator cores; each of the excitation coils is wound around each stator magnetic pole, and each rotor core is arranged outside each stator core; each external magnetic conductive ring is arranged outside each rotor core, and is connected with each rotor core, and a certain clearance is formed between the internal surface of each rotor core and the external surface of each stator core so as to form an air gap; the permanent magnet is positioned between the internal magnetic conductive bodies, and a second air gap is formed between the internal magnetic conductive bodies and the permanent magnet, and is used for forming a magnetic path of electrical excitation. The present invention solves the existing disadvantage that the permanent magnet biased radial magnetic bearings with an external rotor are coupled seriously in the directions of X and Y, and has the advantages of reliable performance and favourable control.

Description

A kind of 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 permanent magnet offset external rotor radial magnetic bearing can be used as the contactless support of rotary component in the machinery such as motor, lathe.
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 it is following several that present permanent magnet offset external rotor radial magnetic bearing structure mainly contains: the first is on the basis of common radial magnetic bearing, on electromagnetic circuit, place permanent magnet, the magnetic flux that control coil produced will pass permanent magnet inside like this, because the permanent magnet magnetic resistance is very big, thereby control coil will produce the exciting curent that certain electromagnetism magnetic flux need be bigger, it two is that permanent magnet is directly linked to each other with stator lasmination is unshakable in one's determination, permanent magnetic circuit can lose too much magnetomotive force when passing stator core like this, thereby can weaken the suction of permanent magnet greatly to rotor shaft, it three is that 4 magnetic poles are formed in stator core, 8 magnetic poles in two ends, the magnetic bearing left and right sides are formed in 2 stator cores, be wound with coil in each stator core, rotor core links to each other by outer magnetic guiding loop, rotor core is inner to be stator core, rotor core internal surface and stator core outer surface leave certain air gap, interior magnetic guiding loop is installed in stator core inside, permanent magnet is positioned in the middle of two magnetic guiding loops, two interior magnetic guiding loops couple together the stator core of two ends, the left and right sides, form flux path, this structure can so that electric magnetic excitation circuit without permanent magnet, and avoided permanent magnet directly to link to each other with the stator core of lamination, but, thereby the control difficulty of magnetic bearing is increased because electric magnetic excitation circuit exists serious coupling on directions X and Y direction.In view of the foregoing, existing permanent magnet offset external rotor radial magnetic bearing exists directions X and Y direction coupling important disadvantages.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, provide the coupling of a kind of directions X and Y direction little, be easy to control, the permanent magnet offset external rotor radial magnetic bearing of reliable performance.
Technical solution of the present invention is: permanent magnet offset external rotor radial magnetic bearing, by outer magnetic guiding loop, permanent magnet, stator core, field coil, interior magnet case, rotor core is formed, it is characterized in that: X in the axle head radial plane has been formed in 4 stator cores, 4 magnetic pole of the stator on the positive negative direction of Y, be connected every magnet with interior by interior magnet case between them, 8 magnetic poles in two ends, the magnetic bearing left and right sides are formed in 8 stator cores, each magnetic pole of the stator is wound with field coil, stator core is outside to be rotor core, the rotor core outside is outer magnetic guiding loop, rotor core internal surface and stator core outer surface leave certain clearance, form air gap, permanent magnet interior magnet case axially between, between interior magnet case, form interstice in the axial both sides of permanent magnet, its length should be greater than the length of 2 times of air gaps, in order to constitute electric magnetic excitation circuit.
The principle of such scheme is: permanent magnet constitutes magnetic circuit by interior magnet case, stator core, air gap, rotor core, outer magnetic guiding loop, in order to permanent magnet bias magnetic field to be provided to magnetic bearing, bears the suffered radial force of magnetic bearing; Because the existence of interstice makes electric magnetic excitation circuit constitute the loop by interior magnet case, stator core, air gap, rotor core, outer magnetic guiding loop and interstice; Wherein the length of interstice should be a bit larger tham the length of 2 times of air gaps, and this is to constitute the flux loss that magnetic circuit produces in order to reduce permanent magnet by interstice.Since separate every magnet with interior between the stator core, can be so that electric magnetic excitation circuit can not produce coupling on directions X and Y direction, and feasible control to magnetic bearing is more prone to.With Y-axis forward magnetic circuit is example, permanent magnetic circuit of the present invention is: magnetic flux is from the permanent magnet N utmost point, get back to the permanent magnet S utmost point by magnet case, stator core, air gap, rotor core, outer magnetic guiding loop in the end to rotor core, air gap, stator core, the interior magnet case of the other end, form the main magnetic circuit of magnetic suspension bearing, shown in Fig. 1 solid line.Electromagnetic circuit is: the rotor core of the stator core of an end, air gap, rotor core, outer magnetic guiding loop, the other end, air gap, stator core, interior magnet case and interstice constitute the closed-loop path, shown in Fig. 1 dotted line.This structure has guaranteed that not only electric magnetic excitation circuit is not by permanent magnet inside, reduced the magnetic resistance of electric magnetic excitation circuit, reduced field current, simultaneously guaranteed the not directly stator core by lamination of permanent magnet magnetic circuit again, reduced the magnetomotive loss of permanent magnetism, each magnetic pole of the stator is separated every magnet owing to interior again, thereby eliminated the coupling of electric magnetic excitation circuit directions X and Y direction, like this can be so that control is simpler.
The present invention's advantage compared with prior art is: the present invention is because the interstice between interior magnet case of utilization and the permanent magnet, make electric magnetic excitation circuit by stator core, air gap, rotor core, outer magnetic guiding loop, interior magnet case and interstice closure, thereby avoid electric magnetic excitation circuit through permanent magnet inside, because this structure makes permanent magnetic circuit directly not pass the stator core of lamination, thereby can in stator core, not lose the permanent magnetism magnetomotive force, each stator core is separated every magnet owing to interior again, thereby eliminated the coupling of electric magnetic excitation circuit directions X and Y direction, this can be so that control be simpler.
Another advantage of the present invention is: in a machinery, if axial length is shorter, for adapting to the requirement of installation dimension, the field coil at described permanent magnet offset external rotor radial magnetic bearing two ends can be controlled separately, the present invention can be used as two bearings uses like this, to reduce axial dimension; If the axial length of equipment is longer, run stability for better assurance equipment, can use described permanent magnet offset external rotor radial magnetic bearing in pairs, and the distance of two bearings is widened as far as possible, at this moment the field coil at two ends, a bearing left and right sides can carry out the series and parallel connection, saves control circuit.
Description of drawings
Fig. 1 is a permanent magnet offset external rotor radial magnetic bearing axial, cross-sectional view of the present invention;
Fig. 2 is permanent magnet offset external rotor radial magnetic bearing axial end figure of the present invention;
Embodiment
As Fig. 1, shown in 2, of the present invention by 1 outer magnetic guiding loop 1,1 permanent magnet 2,8 stator cores 3, in 8 every magnet 9,8 field coils 4,8 interior magnet cases 5,2 rotor cores 6 are formed, X has been formed in 4 stator cores 3,4 magnetic pole of the stator on the Y direction, magnetic bearing left and right sides two ends X has been formed in 8 stator cores 3, magnetic pole of the stator on the Y direction, connect magnetic bearing left and right sides two ends X every magnet 9 in 8, stator core 3 on the Y direction, each magnetic pole of the stator is wound with field coil 4, stator core 3 outsides are rotor core 6, rotor core 6 outsides are outer magnetic guiding loop 1, rotor core 6 internal surfaces and stator core 3 outer surfaces leave certain clearance, form air gap 7, permanent magnet 2 is between interior magnet case 5, form interstice 8 between interior magnet case 5 and the permanent magnet 2, in order to constitute electric magnetic excitation circuit, the length of interstice should be a bit larger tham the length of 2 times of air gaps.
Used outer magnetic guiding loop 1, the interior magnet case 5 of the invention described above technological scheme all made with the good material of magnetic property, as magnetic materials such as electrical pure iron, various carbon steel, cast iron, cast steel, alloyed steel, 1J50 and 1J79 etc.Stator core 3, rotor core 6 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 and the 1J79 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 an axial annulus, magnetizes vertically.Interior material every magnet 9 is metals such as copper, aluminium, titanium alloy.Paint-dipping drying forms after the good electromagnetic wire coiling of field coil 4 usefulness conductions.

Claims (5)

1, permanent magnet offset external rotor radial magnetic bearing, by outer magnetic guiding loop (1), permanent magnet (2), stator core (3), field coil (4), interior magnet case (5), rotor core (6) is formed, it is characterized in that: X in the axle head radial plane has been formed in 4 stator cores (3), 4 magnetic pole of the stator on the positive negative direction of Y, be connected every magnet (9) with interior by interior magnet case (5) between them, 8 magnetic poles in two ends, the magnetic bearing left and right sides are formed in 8 stator cores (3), each magnetic pole of the stator is wound with field coil (4), stator core (3) is outside to be rotor core (6), rotor core (6) outside is outer magnetic guiding loop (1), rotor core (6) internal surface and stator core (3) outer surface leave certain clearance, form air gap (7), permanent magnet (2) be positioned at magnet case (5) axially between, between the magnet case (5) that is positioned at the axial both sides of permanent magnet (2), form interstice (8), its length should be greater than the length of 2 times of air gaps (7), in order to constitute electric magnetic excitation circuit.
2, permanent magnet offset external rotor radial magnetic bearing according to claim 1 is characterized in that: described interior material every magnet (9) is any one in copper, aluminium, the titanium alloy.
3, 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.
4, permanent magnet offset external rotor radial magnetic bearing according to claim 1 is characterized in that: described outer magnetic guiding loop (1), interior magnet case (5) all adopt the good material of magnetic property to make.
5, permanent magnet offset external rotor radial magnetic bearing according to claim 1 is characterized in that: described permanent magnet (2) is an axial annulus, magnetizes vertically.
CNB2005100116901A 2005-05-09 2005-05-09 Permanent magnetism biased radial magnetic bearing in external rotor Expired - Fee Related CN1285840C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB2005100116901A CN1285840C (en) 2005-05-09 2005-05-09 Permanent magnetism biased radial magnetic bearing in external rotor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB2005100116901A CN1285840C (en) 2005-05-09 2005-05-09 Permanent magnetism biased radial magnetic bearing in external rotor

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CN1687607A CN1687607A (en) 2005-10-26
CN1285840C true CN1285840C (en) 2006-11-22

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100441892C (en) * 2007-04-02 2008-12-10 北京航空航天大学 Permanent magnet polarized external rotor radial magnetic bearing
CN101881302A (en) * 2010-07-09 2010-11-10 北京奇峰聚能科技有限公司 Two-air-gap outer rotor radial hybrid magnetic bearing with fault-tolerant function
CN101886669A (en) * 2010-07-09 2010-11-17 北京奇峰聚能科技有限公司 Permanent-magnetic bias outer rotor radial magnetic bearing

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1314908C (en) * 2005-11-10 2007-05-09 北京航空航天大学 Small volume low watt consumption permanent magnet offset external rotor radial magnetic bearing
CN1307375C (en) * 2005-11-10 2007-03-28 北京航空航天大学 Low watt consumption permanent magnet offset external rotor hybrid radial magnetic bearing
CN100451362C (en) * 2007-01-05 2009-01-14 北京航空航天大学 PM offset external rotor radial magnetic bearing with redundant structure
CN100455832C (en) * 2007-06-25 2009-01-28 江苏大学 Three phase hybrid magnetic bearing of three-freedom and two-slices
CN103769932B (en) * 2013-12-31 2017-03-01 冯建国 High-speed rotation organisation of working
CN108869541A (en) * 2018-01-12 2018-11-23 至玥腾风科技投资集团有限公司 A kind of control method of transverse bearing, rotor-support-foundation system and transverse 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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100441892C (en) * 2007-04-02 2008-12-10 北京航空航天大学 Permanent magnet polarized external rotor radial magnetic bearing
CN101881302A (en) * 2010-07-09 2010-11-10 北京奇峰聚能科技有限公司 Two-air-gap outer rotor radial hybrid magnetic bearing with fault-tolerant function
CN101886669A (en) * 2010-07-09 2010-11-17 北京奇峰聚能科技有限公司 Permanent-magnetic bias outer rotor radial magnetic bearing

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