CN104632890A - FDOF (four degrees of freedom) radial magnetic bearing with damping coil integrated structure - Google Patents
FDOF (four degrees of freedom) radial magnetic bearing with damping coil integrated structure Download PDFInfo
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- CN104632890A CN104632890A CN201510015472.9A CN201510015472A CN104632890A CN 104632890 A CN104632890 A CN 104632890A CN 201510015472 A CN201510015472 A CN 201510015472A CN 104632890 A CN104632890 A CN 104632890A
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- 238000013016 damping Methods 0.000 title claims abstract description 79
- 230000004907 flux Effects 0.000 claims description 30
- 230000005484 gravity Effects 0.000 claims description 15
- 238000006073 displacement reaction Methods 0.000 claims description 12
- 239000000725 suspension Substances 0.000 claims description 12
- 230000010355 oscillation Effects 0.000 claims description 5
- 230000004323 axial length Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 11
- 230000002153 concerted effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000001154 acute effect Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
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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
- F16C32/0474—Active magnetic bearings for rotary movement
- F16C32/0487—Active magnetic bearings for rotary movement with active support of four degrees of freedom
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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
- 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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- 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
- F16C32/0468—Details of the magnetic circuit of moving parts of the magnetic circuit, e.g. of the rotor
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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
- F16C2300/00—Application independent of particular apparatuses
- F16C2300/02—General use or purpose, i.e. no use, purpose, special adaptation or modification indicated or a wide variety of uses mentioned
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
The invention discloses an FDOF (four degrees of freedom) radial magnetic bearing with a damping coil integrated structure. The radial magnetic bearing consists of a stator magnetic conductive loop, a stator permanent magnets, a stator iron core, rotor iron cores, a rotor magnetic conductive loop, a rotor permanent magnet, exciting coils, a damping coil, an air gap and a passive part air gap, wherein the stator iron cores I and II consists of eight magnetic poles in X, Y positive and negative directions, each magnetic pole is winded with the exciting coil, and the stator iron cores I and II are respectively connected with the stator permanent magnets I and II; the stator permanent magnet I is connected with the stator permanent magnet II by virtue of the stator magnetic conductive loop, the middle of the stator magnetic conductive loop is winded with the damping coil, and the rotor iron cores I and II are connected with the rotor permanent magnets I and II; the rotor permanent magnets I and II are respectively connected with the rotor magnetic conductive loops I and II, the rotor magnetic conductive loops I and II are connected with the rotor magnetic conductive loop II by virtue of the rotor permanent magnet III, an air gap is formed between the stator iron core and the rotor iron core, and an passive part air gap is formed between the stators. The radial magnetic bearing is capable of control the FDOF, providing an axial passive power, increasing an axial damping and suppressing axial vibration.
Description
Technical field
The present invention relates to a kind of non-contact magnetically suspension bearing, a four-degree-of-freedom radial direction magnetic bearing particularly with damping coil integral structure, can be used as the contactless support of the machinery high speed rotary components such as magnetically levitated flywheel, magnetic suspension control torque gyroscope, motor.
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, and electric current is large, power consumption is large, permanent magnet bias hybrid magnetic suspension bearing, permanent magnetic field bears main bearing capacity, auxiliary adjustment control is carried out in electromagnetism magnetic field, thus this bearing can reduce to control electric current greatly, reduces the wastage.All there is deficiency to a certain extent in current existing permanent magnet offset radial hybrid magnetic bearing structure, the dual permanent-magnet external rotor permanent magnet bias radial direction hybrid magnetic bearing of Chinese Patent Application No. 201010531919.5 structure only can control two radial translational degree of freedom, must use in pairs and could control torsional freedom, thus causing the overall axial length of magnetic bearing to increase, alignment error increases.Chinese Patent Application No. is the inner rotor radial magnetic bearing of 200710065049.5 structures is a kind of four-degree-of-freedom radial direction magnetic bearings, radial translational degree of freedom can not only be controlled and can torsional freedom be controlled, but do not apply axially by power, so need to increase axial magnetic bearing to realize the stable suspersion of rotor.The suspension that the four-degree-of-freedom external rotor magnetic bearing of Chinese Patent Application No. 201410383870.1 structure utilizes magnetic bearing axial to be realized on rotor axial by power, but not applying damping to axial passive part suppresses rotor axial to vibrate, and causes rotor suspension poor stability.Existing main passive magnetic bearing does not mostly have damping device to suppress rotor oscillation, what only damping device realizing damping function adopted is all traditional pure electromagnetism magnetic bearing structure, it by passing into steady current in magnetic bearing coil, a stationary magnetic field is produced between rotor, when there is vibration in rotor, this stationary magnetic field is along with rotor oscillation, eddy current can be produced on rotor, and then generation eddy current loss, play damping function, because the electric current passed in magnetic bearing coil immobilizes, therefore cannot regulate damping, and power consumption is large.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, a kind of four-degree-of-freedom radial direction magnetic bearing with damping coil integral structure is provided, to reduce own vol weight and power consumption, and increase axial active damping, improve the stability of axial suspension.
Technical solution of the present invention is: a kind of four-degree-of-freedom radial direction magnetic bearing with damping coil integral structure is by stator magnetic guiding loop, two stator permanent magnets, two stator cores, two rotor cores, and two rotor magnetic guiding loops, three rotor permanent magnets, field coil, damping coil, air gap, passive part air gaps form; Stator core comprises stator core I and stator core II, rotor core comprises rotor core I and rotor core II, rotor magnetic guiding loop comprises rotor magnetic guiding loop I and rotor magnetic guiding loop II, stator permanent magnet comprises stator permanent magnet I and stator permanent magnet II, and rotor permanent magnet comprises rotor permanent magnet I, rotor permanent magnet II and rotor permanent magnet III; Stator core I and stator core II are parallel to each other, be positioned at the two ends of bearing stator, be made up of the positive negative direction of X, Y four magnetic poles respectively, each magnetic pole is wound with field coil, stator core I is connected with stator permanent magnet II with stator permanent magnet I respectively with stator core II, stator permanent magnet I is connected by stator magnetic guiding loop with stator permanent magnet II, and stator magnetic guiding loop is a centre with the cylinder of the identical annulus projection of two external diameters, is wound with damping coil between two protruding circular rings; Rotor core I and rotor core II are parallel to each other, be positioned at the two ends of bearing rotor, be connected with rotor permanent magnet II with rotor permanent magnet I respectively, rotor permanent magnet I is connected with rotor magnetic guiding loop II with rotor magnetic guiding loop I respectively with rotor permanent magnet II, and rotor magnetic guiding loop I is connected by rotor permanent magnet III with rotor magnetic guiding loop II; Stator core internal surface and rotor core outer surface form air gap, and the outer surface of stator magnetic guiding loop and the internal surface of rotor magnetic guiding loop I and rotor magnetic guiding loop II form passive part air gap; Wherein the damping coil number of turn is 400 ~ 600, and control electric current is-0.5 ~ 0.5A, realizes suppressing the active damping of axial vibration by applying different electric currents to damping coil.In equilibrium position, it is axially identical by power that the gravity that rotor is subject to and the axial dipole field between stator magnetic guiding loop and rotor magnetic guiding loop produce at passive part air gap place, and during axial suspension, rotor is in equilibrium position up-down vibration.Axial vibratory displacement is detected by shaft position sensor, as differential, rotor oscillation speed is obtained to displacement, according to displacement and the speed applying active damping of rotor, concrete grammar is: more than equilibrium position, when velocity attitude upwards time, positive current is led to damping coil, the electromagnetism magnetic flux produced weakens permanent magnet flux at passive part air gap place, thus reduce axially by power, make gravity and axially by downward the increasing with joint efforts of power, damping function is played to rotor speed upwards; More than equilibrium position, when velocity attitude is downward, negative current is led to damping coil, the electromagnetism magnetic flux produced superposes with permanent magnet flux at passive part air gap place, thus increase axially by power, make gravity with axially by power increasing with joint efforts upwards, the speed downward to rotor plays damping function; Below equilibrium position, when velocity attitude is downward, negative current is led to damping coil, the electromagnetism magnetic flux produced superposes with permanent magnet flux at passive part air gap place, thus increase axially by power, make gravity with axially by power increasing with joint efforts upwards, the speed downward to rotor plays damping function; Below equilibrium position, when velocity attitude upwards time, positive current is led to damping coil, the electromagnetism magnetic flux produced weakens permanent magnet flux at passive part air gap place, thus reduce axially by power, make gravity and axially by downward the increasing with joint efforts of power, damping function is played to rotor speed upwards.
Field coil in described stator core I and stator core II controls respectively.
The interstice coverage of described air gap is 0.2mm ~ 0.25mm.
The interstice coverage of described passive part air gap is 0.4mm ~ 0.6mm.
Described stator permanent magnet I, stator permanent magnet II and rotor permanent magnet III are axial annulus, and forward magnetizes vertically, and rotor permanent magnet I and rotor permanent magnet II are axial annulus, and negative sense magnetizes vertically.
The axial length of described rotor permanent magnet III is generally 2mm ~ 2.5mm.
Described stator core axial thickness 2mm less of rotor core axial thickness.
Described stator magnetic guiding loop and rotor magnetic guiding loop, to form passive part air gap place axial thickness identical, are 5mm.
The principle of such scheme is: the four-degree-of-freedom radial direction magnetic bearing of band damping coil integral structure, by controlling two groups of field coils on the positive negative direction magnetic pole of stator core I, II X (or Y), realize the radial translation of magnetic bearing rotating part and radial twisting, axial passive part utilizes stator magnetic guiding loop and rotor magnetic guiding loop I, II to realize the axial translation of magnetic bearing rotating part by the magnetic biasing pulling force that axial displacement produces.Stator permanent magnet I, II and rotor permanent magnet I, II, III provide permanent magnet bias magnetic field to magnetic bearing, bear the radial force suffered by magnetic bearing, the magnetic field that field coil produces plays regulatory role, be used for changing the power often extremely descending magnetic field, keep magnetic bearing air gap even, and making rotor obtain contactless support, the magnetic field that damping coil produces is used for changing the power of passive part air-gap field, makes axially changed by power size thus play the effect of damping.Permanent magnetic circuit of the present invention is three parts (as shown in Figure 2), a part is: magnetic flux is from the N pole of stator permanent magnet I, the S pole of rotor permanent magnet I is got back to by stator core I, air gap, rotor core I, magnetic flux, from the N pole of rotor permanent magnet I, gets back to the S pole of stator permanent magnet I by rotor magnetic guiding loop I, passive part air gap, stator magnetic guiding loop; Second portion is: magnetic flux is from the N pole of rotor permanent magnet III, and by rotor magnetic guiding loop I, passive part air gap, stator magnetic guiding loop, passive part air gap, rotor magnetic guiding loop II gets back to the S pole of rotor permanent magnet III; Part III is: magnetic flux is from the N pole of stator permanent magnet II, the S pole of rotor permanent magnet II is got back to by stator magnetic guiding loop, passive part air gap, rotor magnetic guiding loop II, magnetic flux, from the N pole of rotor permanent magnet II, gets back to the S pole of stator permanent magnet II by rotor core II, air gap, stator core II.The electromagnetic circuit that field coil produces as shown in Figure 3, for the magnetic flux that stator core I Y-axis postive direction coil current produces, its path is: stator core I Y-axis postive direction magnetic pole, Y-axis postive direction air gap to rotor core I, then arrive other three direction air gaps, stator core I formed other three direction magnetic poles, get back to stator core I Y-axis postive direction magnetic pole, form closed-loop path.As shown in Figure 4, its path is the electromagnetic circuit that damping coil produces: stator magnetic guiding loop, passive part air gap, rotor magnetic guiding loop II are to the S pole of rotor permanent magnet III, and the N pole of permanent magnet III, rotor magnetic guiding loop I, passive part air gap are to stator magnetic guiding loop.
The present invention's advantage is compared with prior art: the present invention is on the basis ensureing existing permanent magnet biased magnetic bearing low loss characteristic, the four-degree-of-freedom radial direction magnetic bearing of the band damping coil integral structure proposed uses a permanent magnet offset radial magnetic bearing used in pairs with regard to alternative existing need, can provide axially by power simultaneously, realize axial suspension, without the need to using axial magnetic bearing, axial freedom is controlled, magnetic bearing total system is simplified more, and adopt damping coil, active suppression is carried out to axial vibration, achieve axial stable suspersion.The field coil at described magnetic bearing structure two ends controls separately, and the existence of stator/rotor permanent magnet body makes permanent magnetic circuit and electric magnetic excitation circuit keep apart, and avoids coupling.In a machinery, the present invention substitutes the paired use of existing permanent magnet offset radial hybrid magnetic bearing structure, substantially reduces axial distance, not only simplify magnetic bearing total system, but also ensure that the stable suspersion performance of magnetic bearing.
Accompanying drawing explanation
Fig. 1 is the four-degree-of-freedom radial direction magnetic bearing structural drawing of band damping coil integral structure of the present invention, and Fig. 1 a is axial, cross-sectional view, and Fig. 1 b is longitudinal section view;
Fig. 2 is the four-degree-of-freedom radial direction magnetic bearing permanent magnetic circuit schematic diagram of band damping coil integral structure of the present invention;
Fig. 3 is the electromagnetic circuit schematic diagram that the four-degree-of-freedom radial direction magnetic bearing field coil of band damping coil integral structure of the present invention produces;
Fig. 4 is the electromagnetic circuit schematic diagram that the four-degree-of-freedom radial direction magnetic bearing damping coil of band damping coil integral structure of the present invention produces;
Embodiment
As shown in Figure 1, a kind of four-degree-of-freedom radial direction magnetic bearing with damping coil integral structure, it is characterized in that: by stator magnetic guiding loop 13, two stator permanent magnets, two stator cores, two rotor cores, two rotor magnetic guiding loops, three rotor permanent magnets, field coil 3, damping coil 14, air gap 15, passive part air gaps 16 form; Stator core comprises stator core I 2 and stator core II 11, rotor core comprises rotor core I 4 and rotor core II 10, rotor magnetic guiding loop comprises rotor magnetic guiding loop I 6 and rotor magnetic guiding loop II 8, stator permanent magnet comprises stator permanent magnet I 1 and stator permanent magnet II 12, and rotor permanent magnet comprises rotor permanent magnet I 5, rotor permanent magnet II 9 and rotor permanent magnet III 7; Stator core I 2 and stator core II 11 are parallel to each other, be positioned at the two ends of bearing stator, be made up of the positive negative direction of X, Y four magnetic poles respectively, each magnetic pole is wound with field coil 3, stator core I 2 is connected with stator permanent magnet II 12 with stator permanent magnet I 1 respectively with stator core II 11, stator permanent magnet I 1 is connected by stator magnetic guiding loop 13 with stator permanent magnet II 12, stator magnetic guiding loop 13 is a centre with the cylinder of the identical annulus projection of two external diameters, is wound with damping coil 14 between two protruding circular rings; Rotor core I 4 and rotor core II 10 are parallel to each other, be positioned at the two ends of bearing rotor, be connected with rotor permanent magnet II 9 with rotor permanent magnet I 5 respectively, rotor permanent magnet I 5 is connected with rotor magnetic guiding loop II 8 with rotor magnetic guiding loop I 6 respectively with rotor permanent magnet II 9, and rotor magnetic guiding loop I 6 is connected by rotor permanent magnet III 7 with rotor magnetic guiding loop II 8; Stator core internal surface and rotor core outer surface form air gap 15, and the outer surface of stator magnetic guiding loop 13 and the internal surface of rotor magnetic guiding loop I 6 and rotor magnetic guiding loop II 8 form passive part air gap 16; Wherein damping coil 14 number of turn is 400 ~ 600, and control electric current is-0.5 ~ 0.5A, realizes suppressing the active damping of axial vibration by applying different electric currents to damping coil 14.In equilibrium position, it is axially identical by power that the gravity that rotor is subject to and the axial dipole field between stator magnetic guiding loop and rotor magnetic guiding loop produce at passive part air gap 16 place, during axial suspension, rotor is in equilibrium position up-down vibration, axial vibratory displacement is detected by shaft position sensor, as differential, rotor oscillation speed is obtained to displacement, according to displacement and the speed applying active damping of rotor, concrete grammar is: more than equilibrium position, when velocity attitude upwards time, positive current is led to damping coil 14, the electromagnetism magnetic flux produced weakens permanent magnet flux at passive part air gap 16 place, thus reduce axially by power, make gravity with axially by downward the increasing with joint efforts of power, damping function is risen to rotor speed upwards, more than equilibrium position, when velocity attitude is downward, negative current is led to damping coil 14, the electromagnetism magnetic flux produced superposes with permanent magnet flux at passive part air gap 16 place, thus increase axially by power, make gravity with axially by power increasing with joint efforts upwards, the speed downward to rotor plays damping function, below equilibrium position, when velocity attitude is downward, negative current is led to damping coil 14, the electromagnetism magnetic flux produced superposes with permanent magnet flux at passive part air gap 16 place, thus increase axially by power, make gravity with axially by power increasing with joint efforts upwards, the speed downward to rotor plays damping function, below equilibrium position, when velocity attitude upwards time, positive current is led to damping coil 14, the electromagnetism magnetic flux produced weakens permanent magnet flux at passive part air gap 16 place, thus reduce axially by power, make gravity and axially by downward the increasing with joint efforts of power, damping function is played to rotor speed upwards.
Field coil 3 in described stator core I 2 and stator core II 11 controls respectively, control with the radial translation and radial torsion that realize magnetic bearing rotating part, namely realize rotating part and to control along two translational degree of freedom of X and Y-direction and two torsional freedoms around X and Y-direction control.
In order to reduce the additional displacement negative stiffness that passive part is brought active part, the interstice coverage of described air gap 15 is 0.2mm ~ 0.25mm, and the interstice coverage of passive part air gap 16 is 0.4mm ~ 0.6mm.
Described stator magnetic guiding loop 13, rotor magnetic guiding loop I 6 and rotor magnetic guiding loop II 8 are all made with solid permeability magnetic material, realize magnetic bearing axial stable suspersion by stator magnetic guiding loop 13 and the axile displacement at rotor magnetic guiding loop I 6, rotor magnetic guiding loop II 8 passive part air gap 16 place.
In the invention described above, rotor is in equilibrium position, and it is identical that the positive negative direction of X, Y is subject to suction.If rotor is due to disturbance generation translation, suppose that rotor departs from equilibrium position and moves to-Y-direction, now+Y-direction air gap strengthens and causes suction to reduce, and-Y-direction air gap reduces to make suction increase, galvanization in field coil 3 now on stator core I 2Y direction, make the close and close superposition of permanent-magnet magnetic of the electromagnetism magnetic of stator core I 2+Y direction air gap, the close and close counteracting of permanent-magnet magnetic of the electromagnetism magnetic of-Y-direction air gap; Galvanization in field coil 3 simultaneously on stator core II 11Y direction, make the close and close superposition of permanent-magnet magnetic of the electromagnetism magnetic of stator core II 11+Y direction air gap, close and the close counteracting of permanent-magnet magnetic of the electromagnetism magnetic of-Y-direction air gap, thus make rotor be subject to making a concerted effort in one+Y-direction, can ensure that equilibrium position got back to by rotor; In like manner, if rotor departs from equilibrium position when moving in the X direction, rotor is made to get back to equilibrium position by regulating in stator core I 2, II 11 sense of current in X-direction field coil 3.Twist if rotor departs from equilibrium position due to disturbance, suppose rotor core I 4 to the twisting of+Y-direction rotor core II 10 to-Y-direction twisting, so rotor core I 4 places+Y-direction air gap reduces to cause suction to increase, the increase of-Y-direction air gap makes suction reduce, and rotor core II 10 places+Y-direction air gap increasing causes suction to reduce ,-Y-direction air gap reduces suction is increased.Galvanization in field coil 3 now on stator core I 2Y direction, make the close and close counteracting of permanent-magnet magnetic of the electromagnetism magnetic of stator core I 2+Y direction air gap, close and the close superposition of permanent-magnet magnetic of the electromagnetism magnetic of-Y-direction air gap, makes rotor core I 4 be subject to making a concerted effort in one-Y-direction; Galvanization in field coil 3 on stator core II 11Y direction, make the close and close superposition of permanent-magnet magnetic of the electromagnetism magnetic in stator core II 11+Y direction, close and the close counteracting of permanent-magnet magnetic of the electromagnetism magnetic of-Y-direction air gap, make rotor core II 10 be subject to making a concerted effort in one+Y-direction, thus ensure that equilibrium position got back to by rotor.
The invention described above technological scheme stator magnetic guiding loop 13, rotor magnetic guiding loop I 6 and rotor magnetic guiding loop II 8 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 I 2, stator core II 11, rotor core I 4 and rotor core II 10 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.Stator permanent magnet I 1, stator permanent magnet II 12, rotor permanent magnet I 5, rotor permanent magnet II 9 and rotor permanent magnet III 7 material are the rare-earth permanent magnet that magnetic property is good, Nd-Fe-B permanent magnet or ferrite permanent magnet, stator permanent magnet I 1, stator permanent magnet II 12, rotor permanent magnet I 5, rotor permanent magnet II 9 and rotor permanent magnet III 7 are axial annulus, magnetize vertically, stator permanent magnet I 1, stator permanent magnet II 12 and rotor permanent magnet III 7 vertically forward magnetize, rotor permanent magnet I 5 and rotor permanent magnet II 9 vertically negative sense magnetize, rotor permanent magnet III 7 axial length is 2mm ~ 2.5mm.After field coil 3 and damping coil 14 adopt the good electromagnetic wire coiling of conduction, paint-dipping drying forms.Problem excessive during the magnetic caused in order to the acute angle reduced between stator core magnetic pole root and stator core yoke portion is intensive, stator core end view drawing in Fig. 1 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.
Claims (8)
1. the four-degree-of-freedom radial direction magnetic bearing with damping coil integral structure, it is characterized in that: by stator magnetic guiding loop (13), two stator permanent magnets, two stator cores, two rotor cores, two rotor magnetic guiding loops, three rotor permanent magnets, field coil (3), damping coil (14), air gap (15), passive part air gap (16) compositions, stator core comprises stator core I (2) and stator core II (11), rotor core comprises rotor core I (4) and rotor core II (10), rotor magnetic guiding loop comprises rotor magnetic guiding loop I (6) and rotor magnetic guiding loop II (8), stator permanent magnet comprises stator permanent magnet I (1) and stator permanent magnet II (12), and rotor permanent magnet comprises rotor permanent magnet I (5), rotor permanent magnet II (9) and rotor permanent magnet III (7), stator core I (2) and stator core II (11) are parallel to each other, be positioned at the two ends of bearing stator, respectively by X, the positive negative direction of Y four magnetic pole compositions, each magnetic pole is wound with field coil (3), stator core I (2) is connected with stator permanent magnet II (12) with stator permanent magnet I (1) respectively with stator core II (11), stator permanent magnet I (1) is connected by stator magnetic guiding loop (13) with stator permanent magnet II (12), stator magnetic guiding loop (13) is a centre with the cylinder of the identical annulus projection of two external diameters, damping coil (14) is wound with between two protruding circular rings, rotor core I (4) and rotor core II (10) are parallel to each other, be positioned at the two ends of bearing rotor, be connected with rotor permanent magnet II (9) with rotor permanent magnet I (5) respectively, rotor permanent magnet I (5) is connected with rotor magnetic guiding loop II (8) with rotor magnetic guiding loop I (6) respectively with rotor permanent magnet II (9), and rotor magnetic guiding loop I (6) is connected by rotor permanent magnet III (7) with rotor magnetic guiding loop II (8), stator core internal surface and rotor core outer surface form air gap (15), and the outer surface of stator magnetic guiding loop (13) and the internal surface of rotor magnetic guiding loop I (6) and rotor magnetic guiding loop II (8) form passive part air gap (16), wherein damping coil (14) number of turn is 400 ~ 600, and control electric current is-0.5 ~ 0.5A, realizes suppressing the active damping of axial vibration by applying different electric currents to damping coil (14), when equilibrium position, it is axially identical by power that the gravity that rotor is subject to and the axial dipole field between stator magnetic guiding loop and rotor magnetic guiding loop produce at passive part air gap (16) place, during axial suspension, rotor is in equilibrium position up-down vibration, axial vibratory displacement is detected by shaft position sensor, as differential, rotor oscillation speed is obtained to displacement, according to displacement and the speed applying active damping of rotor, concrete grammar is: more than equilibrium position, when velocity attitude upwards time, to the logical positive current of damping coil (14), the electromagnetism magnetic flux produced weakens permanent magnet flux at passive part air gap (16) place, thus reduce axially by power, make gravity with axially by downward the increasing with joint efforts of power, damping function is risen to rotor speed upwards, more than equilibrium position, when velocity attitude is downward, to the logical negative current of damping coil (14), the electromagnetism magnetic flux produced superposes with permanent magnet flux at passive part air gap (16) place, thus increase axially by power, make gravity with axially by power increasing with joint efforts upwards, the speed downward to rotor plays damping function, below equilibrium position, when velocity attitude is downward, to the logical negative current of damping coil (14), the electromagnetism magnetic flux produced superposes with permanent magnet flux at passive part air gap (16) place, thus increase axially by power, make gravity with axially by power increasing with joint efforts upwards, the speed downward to rotor plays damping function, below equilibrium position, when velocity attitude upwards time, to the logical positive current of damping coil (14), the electromagnetism magnetic flux produced weakens permanent magnet flux at passive part air gap (16) place, thus reduce axially by power, make gravity and axially by downward the increasing with joint efforts of power, damping function is played to rotor speed upwards.
2. the four-degree-of-freedom radial direction magnetic bearing of band damping coil integral structure according to claim 1, is characterized in that: the field coil (3) in described stator core I (2) and stator core II (11) controls respectively.
3. the four-degree-of-freedom radial direction magnetic bearing of band damping coil integral structure according to claim 1, is characterized in that: the interstice coverage of described air gap (15) is 0.2mm ~ 0.25mm.
4. the four-degree-of-freedom radial direction magnetic bearing of band damping coil integral structure according to claim 1, is characterized in that: the interstice coverage of described passive part air gap (16) is 0.4mm ~ 0.6mm.
5. the four-degree-of-freedom radial direction magnetic bearing of band damping coil integral structure according to claim 1, it is characterized in that: described stator permanent magnet I (1), stator permanent magnet II (12) and rotor permanent magnet III (7) are axial annulus, forward magnetizes vertically, rotor permanent magnet I (5) and rotor permanent magnet II (9) are axial annulus, and negative sense magnetizes vertically.
6. the four-degree-of-freedom radial direction magnetic bearing of band damping coil integral structure according to claim 1, is characterized in that: the axial length of rotor permanent magnet III (7) is generally 2mm ~ 2.5mm.
7. the four-degree-of-freedom radial direction magnetic bearing of band damping coil integral structure according to claim 1, is characterized in that: described stator core axial thickness 2mm less of rotor core axial thickness.
8. the four-degree-of-freedom radial direction magnetic bearing of band damping coil integral structure according to claim 1, is characterized in that: described stator magnetic guiding loop and rotor magnetic guiding loop are to form passive part air gap (16) place axial thickness identical.
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| CN201510015472.9A CN104632890B (en) | 2015-01-13 | 2015-01-13 | FDOF (four degrees of freedom) radial magnetic bearing with damping coil integrated structure |
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| CN104632890B CN104632890B (en) | 2017-04-12 |
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| CN114857170B (en) * | 2022-04-19 | 2023-03-24 | 华中科技大学 | Axial magnetic bearing structure of magnetic suspension bearing |
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