CN101799045A - Anti-offcenter magnetic suspension bearing - Google Patents
Anti-offcenter magnetic suspension bearing Download PDFInfo
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- CN101799045A CN101799045A CN200910025506A CN200910025506A CN101799045A CN 101799045 A CN101799045 A CN 101799045A CN 200910025506 A CN200910025506 A CN 200910025506A CN 200910025506 A CN200910025506 A CN 200910025506A CN 101799045 A CN101799045 A CN 101799045A
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Abstract
The invention provides an anti-offcenter magnetic suspension bearing. An electromagnetic anti-offcenter structure or a permanent magnet anti-offcenter magnetic suspension structure is arranged on a permanent magnetic suspension bearing to prevent excessive radial or axial suspension displacement of a main shaft of the magnetic suspension bearing.
Description
Affiliated technical field
The present invention relates to a kind of anti-offcenter magnetic suspension bearing, this magnetic suspension bearing is on the basis of " magnetic suspension bearing of evenly extruding radial suspension rings ", utilization is to the change of removable permanent magnet position, change realizes the high rigidity radial-axial full magnetic suspension of bearing to the extruding force of suspended ring or axial suspension ring radially.Belong to the magnetic levitation technology field.
Background technique
At present, we learn that from " magnetic suspension shaft of evenly extruding radial suspension rings " the rare earth material permanent-magnetic clamp can be realized axial magnetic by magnetic field, side mutual extrusion.But magnet ring is when being subjected to balanced extruding, because magnetic intensity is limited, so the useful load of main shaft will be restricted.Load is excessive, and main shaft will be offset.This moment, we can utilize permanent magnetism anti-eccentric movable magnet ring or magnetic patch, extruding radial or axial suspension ring.To offset the excessive load of levitation axis; Also can utilize electromagnet to obtain permanent-magnetic clamp, with iron hoop replace wherein radially reach the axial suspension magnet ring, utilize sensor to measure the displacement parameter of main shaft in real time, control the power of electromagnet then in real time according to parameter, be subjected to excessive load to offset main shaft.The radial and axial rigidity of levitation axis has just obtained effective raising like this, stability, reliability will be higher.
Summary of the invention
Principle of the present invention is to utilize in permanent-magnetic clamp side mutual extrusion to realize that permanent magnetic radial suspends, and the extruding of permanent-magnetic clamp end face symmetry realizes that the permanent magnetism axial suspension is the basis.Utilize the radial displacement function of removable permanent-magnetic clamp (or permanent magnets group) again, change, help to realize the anti-off-centre of radial suspension the extruding force of suspended ring radially; Utilize the axial displacement of axial compression permanent-magnetic clamp again, change axial compression power, realize the anti-off-centre of axial suspension, thereby improve the radial-axial suspension rigidity of whole magnetic suspension bearing the axial suspension ring.
The technological scheme that problem adopted that the principle of the invention solves is: fix two lateral extrusion magnet rings at the inboard two ends of bearing housing, push two radial suspension rings that are installed on the main shaft, realize that permanent magnetic radial suspends; Two groups of electromagnet are fixed in the outside of two lateral extrusion rings, every group of electromagnet is made up of 4 (or a plurality of) electromagnet, tractive is fixed on the suspension iron hoop on the main shaft, utilizes the power of displacement transducer control electromagnet simultaneously, helps main shaft further to realize radial suspension.An axial compression ring of bearing housing center fixed two ends are pushed with two groups of magnet ring radial-axials respectively, realize axial suspension.
In addition when keeping permanent magnetism axial suspension structure, can also increase by one group of electromagnetic axial suspension structure again, be exactly that a suspension iron hoop is installed on levitation axis, in the both sides of axial suspension iron hoop electromagnet group is installed then, from the iron hoop two end axles to the tractive iron hoop, and the axial attraction force of real time altering prevents that main shaft axial displacement is excessive.
Fix two lateral extrusion magnet rings at the inboard two ends of bearing housing, push two radial suspension rings that are installed on the main shaft, realize that permanent magnetic radial suspends; Two anti-eccentric lateral extrusion rings that can move radially are fixed in the outside of two lateral extrusion rings, push two radial suspension rings.Realization is to the compensation of the load that radially suspends.Two axial compression magnet rings are fixed on the centre of bearing housing, and one of them magnet ring is to realize axial displacement under control.Can change like this axial compression power of two symmetry axis, realize preventing the purpose of main shaft axial displacement to suspended ring.Need to install the main shaft displacement transducer on the bearing.
Wherein but the permanent-magnetic clamp of two radial displacements can be replaced by a plurality of magnetic shoes that carry out radial displacement.
Because the main shaft of magnetic suspension bearing is to be suspended in bearing inside, the power that main shaft is subjected to all directions in the three dimensional space is balanced, so just can realize that main shaft suspends.When main shaft is subjected to the power of a direction once more, this balance will be broken.Desaxe will appear.Excessively desaxe causes equipment to use exactly.The radial deflection phenomenon especially appears.
We find in test, and during the magnet ring lateral compression, distance is near more, and extruding force is big more, between distance 1.5-4 millimeter, has a kind of phenomenon of extruding force acute variation.Be exactly more than 2 millimeters, to decay obviously in distance.And in 2 millimeters of the magnet ring lateral distance, the extruding force decay is not obvious between magnet ring.After suspended ring relies on magnetic levitation reluctantly, add a slight power, this suspension balance is changed.This moment, we were on the basis of original radial suspension, add a major diameter magnet ring, radial magnetic ring of lateral suspension in it, its radial edges spacing is greater than the spacing of existing radial suspension magnet ring group, like this when radial displacement appears in main shaft, the eccentric suspended ring skew of anti-eccentric big ring antagonism will increase near the extruding force of part, and will reduce away from the extruding force of a side.So just can offset the excessive radial load of main shaft.
Description of drawings
Fig. 1 is the radial section tectonic maps of electromagnetism of the present invention, permanent magnetism mixing anti-offcenter magnetic suspension bearing.
Fig. 2 is the axially-aligned view of ring electromagnet in electromagnetism of the present invention, the hybrid magnetic suspension bearing of permanent magnetism.
Fig. 3 of the present inventionly has only permanent magnetism to assist the hybrid magnetic suspension bearing of radial suspension formula
Fig. 4 is the radial section tectonic maps of permanent magnetism anti-offcenter magnetic suspension bearing of the present invention.
But Fig. 5 is the radial section tectonic maps of radial displacement extrusion ring and radial suspension magnet ring among Fig. 4.
But Fig. 6 is the axial view of radial displacement extrusion ring and radial suspension magnet ring among Fig. 4.
But Fig. 7 is the axial view that the radial displacement magnetic shoe is formed magnet ring.
Fig. 8 is iron block and does not seal the common axial view of forming anti-eccentric magnet ring structure of permanent-magnetic clamp.
Fig. 9 is the radial section tectonic maps of the permanent magnetism anti-offcenter magnetic suspension bearing that the homonymy radial suspension rings is fixed and internal diameter does not wait.
The present invention will be further described below in conjunction with accompanying drawing.
Among Fig. 1, main shaft 1, bearing housing 2, radial suspension iron hoop 3, electromagnet group 4, radial suspension magnet ring 3a, permanent magnetic radial extrusion ring 4a, big axially suspension magnet ring 5, little axial suspension magnet ring 6 is fixed on the axial compression magnet ring 7 on the bearing housing, non-magnetic ring 8 etc.The electromagnet group 4 that is installed in bearing housing 2 two ends is implemented balanced tractive by attraction force to the suspension iron hoop 3 that is installed on the main shaft 1, makes iron hoop 3 be in the radial suspension state.The permanent magnetic radial extrusion ring 4a that is installed on the bearing housing 2 passes through magnetic field, magnetic-field extrusion radial suspension rings 3a side, side, makes radial suspension rings 3a be in the radial suspension state, further improves radial suspension stability.Be installed in the magnet ring group that bearing housing 2 middle axial compression ring 7 bilateral symmetry extruding are made up of big axially suspended ring 5 and little axial suspension ring 6, make the magnet ring group be in the axial suspension state.Radial suspension rings and axial suspension ring all are installed on the main shaft, and main shaft is suspended fully.Radial suspension rings and axial suspension ring separate by non-magnetic ring 8.The pulling force of 4 pairs of iron hoops 3 of electromagnet group changes with the variation of displacement transducer parameter.
Fig. 2 is the axially-aligned view of electromagnet group 4 among Fig. 1.The wherein arrangement of four electromagnet 4 equilibriums is used for the radially side of tractive Fig. 1 iron hoop 3, increases the radial suspension rigidity of main shaft 1.While is all right installation position displacement sensor 9 in electromagnet 4, uninterruptedly adjusts the power of each electromagnet.
Among Fig. 3, radial permanent magnet, electromagnetic suspension structure are identical with Fig. 1.Two axial suspension iron hoops 5 are installed on the main shaft, and axial suspension by the attraction force of 6 pairs of two iron hoops 5 of electromagnet, realizes the axial suspension of main shaft in the both sides of two electromagnet 6.In order to increase axial suspension power, two balanced permanent magnetism axial suspension rings can also be installed on main shaft 1 again, on bearing housing 2, fix a permanent magnetism axial compression ring again, help main shaft to realize that axial suspension is anti-eccentric.
Fig. 4 is the radial section tectonic maps of radial and axial anti-offcenter magnetic suspension bearing of the present invention.Wherein, main shaft 1, bearing housing 2, radially anti-eccentric suspension magnet ring 3, radially anti-eccentric extruding magnet ring 4, radial suspension magnet ring 3a, lateral extrusion magnet ring 4a, axial suspension magnet ring 5, fixedly the axial compression magnet ring 6, can axially movable axial compression magnet ring 6a, the not ring 7 of electromagnetism.Two the lateral extrusion ring 4a that fix at bearing housing 2 two ends carry out lateral extrusion to the side that is installed in two radial suspension rings 3a on the main shaft; Also installed in the outside of two lateral extrusion ring 4a and can move radially magnet ring 4, pushed two anti-eccentric radial suspension rings 3.Wherein move radially the internal diameter of the internal diameter of magnet ring 4, when radial displacement, can make radially to resist a side of eccentric magnet ring 3 stressed bigger, like this to offset the excessive radial load that main shaft is subjected to for lateral extrusion ring 4a.Be installed in the fixedly permanent magnetism axial compression ring 6 on the bearing housing 2 and can carry out axial compression to two symmetry axis to suspended ring 5 by axially movable axial compression ring 6a.Can adjust the axial suspension displacement of main shaft this moment by changing the position of axial compression ring 6a, realizes the axially anti-eccentric of main shaft.The position that the main shaft displacement transducer is installed is not limit.
But Fig. 5 is the radial section tectonic maps of radial displacement extrusion ring and radial suspension magnet ring among Fig. 4.Wherein be under the horizontal state of rest at bearing, the lateral extrusion magnet ring 4 that can move radially can maintain static.
But Fig. 6 is the axial view of radial displacement extrusion ring and radial suspension magnet ring among Fig. 4.
But Fig. 7 is the axial view that the radial displacement magnetic shoe is formed magnet ring.Wherein magnetic shoe 1,2,3,4 can realize that all controllable radial moves.
Fig. 8 is iron block and does not seal the common axial view of forming anti-eccentric magnet ring structure of permanent-magnetic clamp.Wherein iron block 1 can be replaced by electromagnet, also can be replaced by little magnetic patch, only otherwise the lateral extrusion power of 2 pairs of suspended rings of sealing magnet ring and the gravity that can offset levitation axis with joint efforts of iron block.Or the suspending power that does not seal magnet ring 2 can offset the pressure that main shaft gravity adds top little magnetic patch, and it is more stable to make that main shaft suspends.
Among Fig. 9, two anti-eccentric lateral extrusion magnet rings 4 are fixed on the two ends of bearing housing 2, push two 3, two lateral extrusion magnet rings of anti-eccentric radial suspension magnet ring 4a that are fixed on the main shaft 1 and be fixed on the interior survey of magnet ring 4, extruding is fixed on two radial suspension rings 3a on the main shaft 1.Under metastable state, main shaft can be suspended in position on the lower side, lateral extrusion magnet ring 4a center.When being subjected to the super large radial force, radial deflection will appear in magnet ring.This moment, one side of anti-eccentric radial suspension magnet ring 3 will be near anti-eccentric lateral extrusion magnet ring 4 inboards of major diameter, and in addition on one side will be away from anti-eccentric lateral extrusion magnet ring 4 inboards, footpath, so just can when realizing radial suspension, can prevent the radial disbalance of levitation axis again.Two axial compression rings 6 are installed in the centre of bearing housing 2, and extruding is fixed on the axial suspension ring 5 on the main shaft 1 respectively, realizes the axial suspension of main shaft.
Because during the magnet ring lateral compression, distance is near more, extruding force is big more, but has a kind of phenomenon of extruding force acute variation at 2 millimeters annexes of distance.Be exactly more than 2 millimeters,, to decay obviously apart from big more in distance.And in 1.5 millimeters of the two magnet ring lateral distance, the extruding force decay is not obvious between magnet ring.After suspended ring relies on magnetic levitation reluctantly, add a slight power, this suspension balance is changed.The not enough phenomenon of radial force rigidity will appear.This moment, we were when its radial position changes, additional again lateral extrusion power in its outside, this lateral extrusion power that is produced by big magnet ring 4 is when radial deflection appears in suspended ring 3, will the extruding force near one side be increased, and obviously reduce away from extruding force on one side.So just can offset excessive radial load, prevent that excessive radial off-centre from appearring in levitation axis.And do not need complicated numerical control system, and process easyly, large-scale industrialized production suits.
In above-mentioned design, can recessing on the compressive plane of magnet ring and non-compressive plane, the groove shapes of being opened is not limit, and groove can be continuous annular, can be discontinuous groove also, or the hole that does not penetrate.Also can process some projections on the non-compressive plane of magnet ring, these projections can be that annular is continuous, also can be discontinuous annulars, and its shape is not limit.Its purposes can be to play fixation, also can play the effect that increases compressive plane table magnetic.
In above-mentioned design, symmetry, a small amount of perforate on magnet ring can not influence the table magnetic of magnet ring.So can reduce the weight of bearing by magnet ring is implemented perforating optimization, economize on resources.The compressive plane of the magnet ring in the above-mentioned design and non-compressive plane edge can chamferings, also chamfering not.
In above-mentioned design, magnet ring can be whole magnet ring, also can be the magnet ring that is spliced by magnetic shoe.Can be gapped between the splicing magnetic shoe, also can be very close to each other.Also projection, groove and perforation can be arranged on the magnetic shoe.
In above-mentioned design, the compressive plane of lateral extrusion ring and radial suspension rings can be parallel to main shaft, also can be the conical surface that is not parallel to main shaft.
In above-mentioned permanent magnet suspension structure, radial suspension, axial suspension structure can be carried out any permutation and combination according to different needs and be used.
To maintain a certain distance between iron hoop and the lateral extrusion permanent-magnetic clamp in addition or separate with resistance magnetic material.
Above-mentioned bearing all can separate a segment distance from the centre, the middle or both sides installation rotating carrier at main shaft.
Except that above embodiment, the present invention also has other mode of executions.All employings are equal to the hybrid magnetic suspension bearing of electromagnetism, permanent magnetism of replacement, equivalent deformation formation, and its technological scheme all drops in protection scope of the present invention.
Claims (8)
1. anti-offcenter magnetic suspension bearing is characterized in that: the electromagnet group 4 that is installed in bearing housing 2 two ends is implemented balanced tractive by attraction force to the suspension iron hoop 3 that is installed on the main shaft 1, makes iron hoop 3 be in the radial suspension state.The permanent magnetic radial extrusion ring 4a that is installed on the bearing housing 2 passes through magnetic field, magnetic-field extrusion radial suspension rings 3a side, side, makes radial suspension rings 3a be in the radial suspension state, further improves radial suspension stability.Be installed in the magnet ring group that bearing housing 2 middle axial compression ring 7 bilateral symmetry extruding are made up of big axially suspended ring 5 and little axial suspension ring 6, make the magnet ring group be in the axial suspension state.Radial suspension rings and axial suspension ring all are installed on the main shaft, and main shaft is suspended fully.Radial suspension rings and axial suspension ring separate by non-magnetic ring 8.The pulling force of 4 pairs of iron hoops 3 of electromagnet group changes with the variation of displacement transducer parameter.
2. anti-offcenter magnetic suspension bearing according to claim 1 is characterized in that: can use the anti-eccentric structure of full permanent magnetic radial to replace the radially anti-eccentric structure of electromagnet and iron hoop composition.Wherein be slightly larger than the magnet ring replacement electromagnet of lateral extrusion ring internal diameter, replace iron hoop with permanent-magnetic clamp with internal diameter.The anti-eccentric lateral extrusion ring of this large diameter can be completely fixed on the bearing housing, also can be installed in and can move radially on the device, and can move radially.
3. anti-offcenter magnetic suspension bearing according to claim 1 is characterized in that: can replace electromagnet with moving radially magnetic shoe, but each permanent magnetic tile can be realized moving radially.
4. anti-offcenter magnetic suspension bearing according to claim 1 is characterized in that: the axial compression ring that is fixed on the bearing housing can be fixed, and also can be can be axially movable.
5. anti-offcenter magnetic suspension bearing according to claim 1 is characterized in that: can there be groove in the compressive plane of magnet ring and non-compressive plane.The shape and the degree of depth of groove are not limit, even can be the holes that symmetry penetrates.The non-compressive plane of magnet ring is that projection can also be installed simultaneously, needs only symmetry and does not influence rotation, and the continuity and the shape of projection are not limit.
6. anti-offcenter magnetic suspension bearing according to claim 1 is characterized in that: the complete magnet ring that is used for radial suspension and axial suspension can be spliced by magnetic shoe, also can be to be formed by big magnet ring cover bead.
7. anti-offcenter magnetic suspension bearing according to claim 1 is characterized in that: the compressive plane of radial suspension and extruding magnet ring can be parallel to main shaft, also can be the tapered collar that is not parallel to main shaft.Axial suspension can chamfering with its compressive plane edge of magnet ring.
8. anti-offcenter magnetic suspension bearing according to claim 1 is characterized in that: above all designs all can increase and decrease arbitrarily and are used in combination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910025506A CN101799045A (en) | 2009-02-06 | 2009-02-06 | Anti-offcenter magnetic suspension bearing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910025506A CN101799045A (en) | 2009-02-06 | 2009-02-06 | Anti-offcenter magnetic suspension bearing |
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| CN101799045A true CN101799045A (en) | 2010-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910025506A Pending CN101799045A (en) | 2009-02-06 | 2009-02-06 | Anti-offcenter magnetic suspension bearing |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105364604A (en) * | 2015-12-15 | 2016-03-02 | 东南大学 | Non-contact permanent magnetic loading device for machine tool spindle |
| CN106787409A (en) * | 2017-01-12 | 2017-05-31 | 陈科枫 | Energy accumulation device for fly wheel |
| CN106763183A (en) * | 2017-01-12 | 2017-05-31 | 陈科枫 | Permanent-magnet suspension bearing based on gyroscopic effect |
| CN107263215A (en) * | 2017-08-18 | 2017-10-20 | 沈阳建筑大学 | A kind of eccentricity compensation system for electrical spindle for machine tool |
| CN108361280A (en) * | 2018-05-03 | 2018-08-03 | 南京高明环保科技有限公司 | Permanent magnetism magnetic suspension bearing |
| CN111927797A (en) * | 2020-09-27 | 2020-11-13 | 天津飞旋科技有限公司 | Automatic adjustment method, device and system for magnetic suspension composite molecular pump |
-
2009
- 2009-02-06 CN CN200910025506A patent/CN101799045A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105364604A (en) * | 2015-12-15 | 2016-03-02 | 东南大学 | Non-contact permanent magnetic loading device for machine tool spindle |
| CN105364604B (en) * | 2015-12-15 | 2017-12-26 | 东南大学 | A kind of non-contact permanent magnetism loading device of machine tool chief axis |
| CN106787409A (en) * | 2017-01-12 | 2017-05-31 | 陈科枫 | Energy accumulation device for fly wheel |
| CN106763183A (en) * | 2017-01-12 | 2017-05-31 | 陈科枫 | Permanent-magnet suspension bearing based on gyroscopic effect |
| CN107263215A (en) * | 2017-08-18 | 2017-10-20 | 沈阳建筑大学 | A kind of eccentricity compensation system for electrical spindle for machine tool |
| CN108361280A (en) * | 2018-05-03 | 2018-08-03 | 南京高明环保科技有限公司 | Permanent magnetism magnetic suspension bearing |
| CN111927797A (en) * | 2020-09-27 | 2020-11-13 | 天津飞旋科技有限公司 | Automatic adjustment method, device and system for magnetic suspension composite molecular pump |
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Application publication date: 20100811 |