CN203926400U - A kind of adjustable rigidity radial permanent magnet bearing - Google Patents
A kind of adjustable rigidity radial permanent magnet bearing Download PDFInfo
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- CN203926400U CN203926400U CN201420344206.1U CN201420344206U CN203926400U CN 203926400 U CN203926400 U CN 203926400U CN 201420344206 U CN201420344206 U CN 201420344206U CN 203926400 U CN203926400 U CN 203926400U
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Abstract
The utility model discloses a kind of adjustable rigidity radial permanent magnet bearing, comprising: stator, stator permanent magnet magnet ring, stator magnetic ring controlling device, rotor, rotor permanent magnet magnet ring; At the inner peripheral surface opposite position place of stator and rotor identical stator permanent magnet magnet ring and the rotor permanent magnet magnet ring of magnitude setting respectively; On described stator permanent magnet magnet ring, be connected with the stator magnetic ring controlling device for regulating stator magnetic ring axial spacing, between described stator permanent magnet magnet ring and rotor permanent magnet magnet ring, leave the gap that is used to form radial air gap.The utility model beneficial effect: compared with conventional radial Permanent-magnet bearing, when rotor is during in a certain position, can, by regulating axial position and the axial spacing of stator magnetic ring, regulate radial force and radial suspension rigidity between stator rotor, conventional radial Permanent-magnet bearing cannot regulate.
Description
Technical field
The utility model relates to a kind of bearing, relates in particular to a kind of adjustable rigidity radial permanent magnet bearing.
Background technique
The theoretical research of magnetic bearing is the earliest from Permanent-magnet bearing, and the people such as Earnshaw find, only can not be realized the stable suspersion of all degrees of freedom by Permanent-magnet bearing.Yonnet etc. have proposed the radial and axial Permanent-magnet bearing of various structures, and set up model its bearing capacity and stiffness is calculated.Dellinger, the people such as Tan Qingchang utilize Method of Equivalent Magnetic Charge, and the radial permanent magnet bearing of axial magnetized has been carried out mathematical modeling and solved.The people such as Tian Lulin utilize magnetic circuit model and method of virtual displacement rigidity and the bearing capacity to multiple Permanent-magnet bearing to calculate.More than research all concentrates on the relation solving between the bearing capacity and stiffness of Permanent-magnet bearing and magnet size, levitation gap, rigidity is determined by the structural parameter of system, once after design machines, cannot regulate, lack the theory and application research of adjustable rigidity Permanent-magnet bearing.
Radial permanent magnet magnetic suspension bearing utilizes the magnetic force between permanent magnet, realizes rotor suspension in desired location radially.Current radial permanent magnet bearing adopts double-ring more, or multi-annular structure, and rotor portion is assembled side by side by one or more ring axial magnetic, and stationary part is also assembled side by side by one or more ring axial magnetic, and both are without physical contact.When rotor is during in radial deflection equilibrium position, stator magnetic ring can produce the radial force of a point towards equilibrium positions to rotor magnetic ring, make rotor get back to equilibrium position, thereby realizes driven suspension radially.Rigidity is leading indicator and the parameter that characterizes radial permanent magnet bearing characteristics.
Permanent-magnet bearing usually will face variable load in application, therefore the unadjustable driven suspension characteristic that often affects Permanent-magnet bearing of rigidity.In addition, stiffness tuning is crossed aspect critical speed of rotation and vibration suppression and is had important effect at high-speed rotating machine.Tradition Permanent-magnet bearing rigidity is non-adjustable, thereby has limited the application of Permanent-magnet bearing.Realize the adjusting of Permanent-magnet bearing rigidity, will widen the application of Permanent-magnet bearing.
The shortcoming of current radial permanent magnet bearing is, rigidity is determined by the structural parameter of system, specifically comprise the parameters such as the magnetic property, physical dimension, magnetizing direction of permanent magnet, after once design machines, rotor is in the time of a certain position, space, the rigidity of radial permanent magnet bearing is determined, cannot regulate.
The rigidity of radial permanent magnet bearing cannot regulate, and can cause a series of system problem:
1) support performance of system cannot regulate, and cannot adapt to variable load.
2) critical speed of rotation of system is determined by rigidity, in the time that working speed is near critical speed of rotation, will resonate, and causes system unstable.
3) compared with electromagnetic bearing, do not possess the characteristic that bearing capacity is adjustable, rigidity is adjustable, limit the application of radial permanent magnet bearing.
Model utility content
The purpose of this utility model is exactly in order to address the above problem, and a kind of adjustable rigidity radial permanent magnet bearing is provided, and the rigidity of this radial permanent magnet bearing can regulate according to Practical Project demand, can adapt to unequally loaded needs.
To achieve these goals, the utility model adopts following technological scheme:
A kind of adjustable rigidity radial permanent magnet bearing, comprising: stator, stator permanent magnet magnet ring, stator magnetic ring controlling device, rotor, rotor permanent magnet magnet ring;
At the inner peripheral surface opposite position place of stator and rotor identical stator permanent magnet magnet ring and the rotor permanent magnet magnet ring of magnitude setting respectively;
On described stator permanent magnet magnet ring, be connected with the stator magnetic ring controlling device for regulating stator magnetic ring axial spacing, stator magnetic ring controlling device can drive stator permanent magnet magnet ring to move vertically under external force, between described stator permanent magnet magnet ring and rotor permanent magnet magnet ring, leaves the gap that is used to form radial air gap.
Described stator magnetic ring controlling device one end is provided with connecting head, the other end for being connected with stator permanent magnet magnet ring and is provided with the swivel head for driving the rotation of stator magnetic ring controlling device, and the one side that the intermediate portion of stator magnetic ring controlling device contacts with stator is provided with the worm structure for being connected with stator; Described swivel head is positioned at stator outside, drives rotation by external driver device, and then passes through the change of the distance control stator magnetic ring controlling device axial position that changes stator magnetic ring controlling device precession stator.
Described external driver device drives for outside stepper motor, by the change of Electric Machine Control stator magnetic ring controlling device axial position.
Described stator magnetic ring controlling device is made up of nonmagnetic substance.
Between described stator magnetic ring controlling device and stator permanent magnet magnet ring, be fastenedly connected by bonding or mechanical fit system; Stator magnetic ring controlling device can be driven vertically and be moved by external force.
Described rotor is arranged on stator interior or rotor is arranged on stator outside.
Described stator permanent magnet magnet ring is made up of two axial chargings and the relative stator magnetic ring of magnetizing direction, and each stator magnetic ring all connects the stator magnetic ring controlling device for regulating stator magnetic ring axial spacing.
Described rotor permanent magnet magnet ring is made up of two axial chargings and the relative rotor magnetic ring of magnetizing direction.
Described stator permanent magnet magnet ring and rotor permanent magnet magnet ring are evenly arranged respectively on the inner peripheral surface of stator and rotor.
The beneficial effects of the utility model:
1) compared with conventional radial Permanent-magnet bearing, when rotor is during in a certain position, can, by regulating axial position and the axial spacing of stator magnetic ring, regulate radial force and radial suspension rigidity between stator rotor, conventional radial Permanent-magnet bearing cannot regulate.
2) the utility model is simple in structure, and the radial magnetic bearing that traditional rigidity is adjustable needs the hardware such as sensor, controller, power amplifier, these hardware of the utility model abridged.
3) this structure regulates by radial rigidity, can change the critical speed of rotation of rotor, can adapt to different working environments.
Brief description of the drawings
Fig. 1 is that adjustable rigidity radial permanent magnet bearing rotor is at interior structural representation;
Fig. 2 is stator magnetic ring controlling device structural representation;
Fig. 3 is the adjustable rigidity radial permanent magnet bearing radial cross-section of removing stator magnetic ring controlling device;
Fig. 4 is adjustable rigidity radial permanent magnet bearing rotor structural representation outside;
Stiffness variation relation when Fig. 5 is the single-ended adjusting of radial permanent magnet bearing stator magnet ring;
Stiffness variation relation when Fig. 6 is the adjusting of radial permanent magnet bearing stator magnet ring both-end.
Wherein, 1. stator, 2. stator permanent magnet magnet ring, 3. stator magnetic ring controlling device, 4. rotor 5. rotor permanent magnet magnet rings, 6. worm structure, 7. swivel head, 8. connecting head.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail.
As Fig. 1, the radial permanent magnet magnetic suspension bearing of adjustable rigidity, this magnetic bearing is separate loading, is made up of stationary part and moving element, and stationary part is connected with the standing part of equipment, and moving element is connected with the rotating part of equipment; Stationary part comprises stator 1, stator permanent magnet magnet ring 2, stator magnetic ring controlling device 3; Moving element comprises rotor 4, rotor permanent magnet magnet ring 5.In stationary part, stator permanent magnet magnet ring 2 is axial charging, and the magnetizing direction of two magnet rings is relative, is jointly arranged on stator 1 inner peripheral surface, axially can move freely; Stator magnetic ring is connected with stator magnetic ring controlling device 3 respectively, by moving axially of regulator, can regulate the axial spacing of 2 of stator permanent magnet magnet rings.In rotor portion, rotor permanent magnet magnet ring 5 is made up of two axial charging magnet rings, arranges with the form that homopolarity is relative, and identical in the arrangement mode of stator permanent magnet magnet ring 2, between stator permanent magnet magnet ring 2 and rotor permanent magnet magnet ring 5, leave certain gap, form the radial air gap of radial permanent magnet bearing.
As shown in Figure 2, connecting head 8, the other end that stator magnetic ring controlling device 3 one end are provided with for being connected with stator permanent magnet magnet ring 2 are provided with the swivel head 7 for driving stator magnetic ring controlling device 3 to rotate, and the one side that the intermediate portion of stator magnetic ring controlling device 3 contacts with stator 1 is provided with the worm structure 6 for being connected with stator 1; Described swivel head 7 is positioned at stator outside, drives rotation by external driver device, and then passes through the change of distance control stator magnetic ring controlling device 3 axial positions that change stator magnetic ring controlling device 3 precession stators.
The effect of stator magnetic ring controlling device 3 is that stator permanent magnet magnet ring 2 can be moved vertically, between stator magnetic ring controlling device 3 and stator permanent magnet magnet ring 2, can the mode such as coordinate to be fastenedly connected by bonding, machinery, stator magnetic ring controlling device 3 be driven vertically and is moved by external force.Driving mode has multiple, for example mode 1: stator magnetic ring controlling device 3 can and stator 1 shell between can be threaded, reach the object of the axial position that changes stator magnetic ring controlling device 3 and stator permanent magnet magnet ring 2 by precession.Mode 2: stator magnetic ring controlling device 3 can be connected with outer linear stepper motor, by the axial position of Electric Machine Control stator magnetic ring controlling device 3.
As shown in Figure 3, stator permanent magnet magnet ring 2 and rotor permanent magnet magnet ring 5 are evenly arranged respectively the radial cross-section of this radial permanent magnet bearing on the inner peripheral surface of stator and rotor.
Figure 4 shows that radial permanent magnet bearing rotor structural representation outside, rotor is arranged on stator outside, the set-up mode of stator permanent magnet magnet ring 2 and rotor permanent magnet magnet ring 5 is constant, stator permanent magnet magnet ring 2 is connected with stator magnetic ring controlling device 3 respectively, by moving axially of regulator, can regulate the axial spacing of 2 of stator permanent magnet magnet rings.
Radial permanent magnet bearing working principle:
When rotor permanent magnet magnet ring 5 is during in radial center position, the radial force between stator permanent magnet magnet ring 2 and rotor permanent magnet magnet ring 5 is zero.In the time of rotor Off-Radial central position, the radially repulsion between stator permanent magnet magnet ring 2 and rotor permanent magnet magnet ring 5 points to axis direction, makes rotor get back to equilibrium position.
Radial permanent magnet bearing rigidity Principles of Regulation:
The rigidity of radial permanent magnet is mainly determined by the magnetic repulsion between stator permanent magnet magnet ring 2 and rotor permanent magnet magnet ring 5, and magnetic repulsion is realized by the magnetic field at air gap place between rotor.In the time that needs regulate magnetic bearing and rigidity, stator magnetic ring controlling device 3 can be driven by external force, moves vertically, drives stator permanent magnet magnet ring 2 to move axially, thereby change Magnetic field distribution and magnetic intensity between rotor air gap, reach the effect that regulates radial permanent magnet bearing and rigidity.
Regulative mode has two kinds: one is that one end stator magnetic ring controlling device 3 maintains static, one end stator magnetic ring controlling device 3 moves axially in addition, the feature of this regulative mode is, stator 1 part only has a mobile mechanism, degree of regulation is relatively high, in regulating rigidity, axial force can change simultaneously; Another kind is that the stator magnetic ring controlling device 3 at two ends moves simultaneously, and the feature of this regulative mode is to keep axial force constant.
By finite element analysis, obtain the rigidity of rigidity adjustable radial Permanent-magnet bearing with the relation between stator permanent magnet magnet ring 2 axial spacings.Fig. 5 is to typical radial permanent magnet bearing shaft, one end stator magnetic ring controlling device 3 maintains static, when one end stator magnetic ring controlling device 3 moves axially in addition, the relation between stator shaft orientation spacing and Permanent-magnet bearing radial rigidity, can see, in whole adjustment process, radial rigidity be always on the occasion of, keep stable suspersion radially, along with the increase of axial spacing, radial rigidity first reduces, and arrives minimum value rising afterwards.
When stator magnetic ring two ends regulate simultaneously, and two ends regulated quantity is when identical, and the rigidity of radial permanent magnet bearing increases and reduces with axial air-gap, until be zero, then rigidity becomes negative value, and increases with axial axial air-gap, first increases afterwards and reduces, as shown in Figure 6.Therefore in the time that both-end regulates radial permanent magnet bearing, rigidity, except the variation on numerical value, can also, from the occasion of becoming negative value, become axial stable suspersion from stable suspersion radially.
By reference to the accompanying drawings embodiment of the present utility model is described although above-mentioned; but the not restriction to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various amendments that creative work can make or distortion still in protection domain of the present utility model.
Claims (9)
1. an adjustable rigidity radial permanent magnet bearing, comprising: stator, stator permanent magnet magnet ring, stator magnetic ring controlling device, rotor, rotor permanent magnet magnet ring; It is characterized in that,
At the inner peripheral surface opposite position place of stator and rotor identical stator permanent magnet magnet ring and the rotor permanent magnet magnet ring of magnitude setting respectively;
On described stator permanent magnet magnet ring, be connected with the stator magnetic ring controlling device for regulating stator magnetic ring axial spacing, stator magnetic ring controlling device can drive stator permanent magnet magnet ring to move vertically under external force, between described stator permanent magnet magnet ring and rotor permanent magnet magnet ring, leaves the gap that is used to form radial air gap.
2. a kind of adjustable rigidity radial permanent magnet bearing as claimed in claim 1, it is characterized in that, described stator magnetic ring controlling device one end is provided with connecting head, the other end for being connected with stator permanent magnet magnet ring and is provided with the swivel head for driving the rotation of stator magnetic ring controlling device, and the one side that the intermediate portion of stator magnetic ring controlling device contacts with stator is provided with the worm structure for being connected with stator; Described swivel head is positioned at stator outside, drives rotation by external driver device, and then passes through the change of the distance control stator magnetic ring controlling device axial position that changes stator magnetic ring controlling device precession stator.
3. a kind of adjustable rigidity radial permanent magnet bearing as claimed in claim 2, is characterized in that, described external driver device drives for outside stepper motor, by the change of Electric Machine Control stator magnetic ring controlling device axial position.
4. a kind of adjustable rigidity radial permanent magnet bearing as claimed in claim 1, is characterized in that, described stator magnetic ring controlling device is made up of nonmagnetic substance.
5. a kind of adjustable rigidity radial permanent magnet bearing as claimed in claim 1, is characterized in that, between described stator magnetic ring controlling device and stator permanent magnet magnet ring, is fastenedly connected by bonding or mechanical fit system; Stator magnetic ring controlling device can be driven vertically and be moved by external force.
6. a kind of adjustable rigidity radial permanent magnet bearing as claimed in claim 1, is characterized in that, described rotor is arranged on stator interior or rotor is arranged on stator outside.
7. a kind of adjustable rigidity radial permanent magnet bearing as claimed in claim 1, it is characterized in that, described stator permanent magnet magnet ring is made up of two axial chargings and the relative stator magnetic ring of magnetizing direction, and each stator magnetic ring all connects the stator magnetic ring controlling device for regulating stator magnetic ring axial spacing.
8. a kind of adjustable rigidity radial permanent magnet bearing as claimed in claim 1, is characterized in that, described rotor permanent magnet magnet ring is made up of two axial chargings and the relative rotor magnetic ring of magnetizing direction.
9. a kind of adjustable rigidity radial permanent magnet bearing as claimed in claim 1, is characterized in that, described stator permanent magnet magnet ring and rotor permanent magnet magnet ring are evenly arranged respectively on the inner peripheral surface of stator and rotor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420344206.1U CN203926400U (en) | 2014-06-24 | 2014-06-24 | A kind of adjustable rigidity radial permanent magnet bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420344206.1U CN203926400U (en) | 2014-06-24 | 2014-06-24 | A kind of adjustable rigidity radial permanent magnet bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203926400U true CN203926400U (en) | 2014-11-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420344206.1U Expired - Fee Related CN203926400U (en) | 2014-06-24 | 2014-06-24 | A kind of adjustable rigidity radial permanent magnet bearing |
Country Status (1)
| Country | Link |
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| CN (1) | CN203926400U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104019130A (en) * | 2014-06-24 | 2014-09-03 | 山东大学 | Radial permanent magnet bearing with adjustable stiffness |
| CN104847789A (en) * | 2015-04-10 | 2015-08-19 | 北京理工大学 | Ball bearing rigidity control device and method for reducing ball bearing rotor transcritical rotation speed amplitude |
| CN112013017A (en) * | 2020-09-23 | 2020-12-01 | 核工业理化工程研究院 | Magnetic bearing system with active axial clearance adjustment and control |
-
2014
- 2014-06-24 CN CN201420344206.1U patent/CN203926400U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104019130A (en) * | 2014-06-24 | 2014-09-03 | 山东大学 | Radial permanent magnet bearing with adjustable stiffness |
| CN104847789A (en) * | 2015-04-10 | 2015-08-19 | 北京理工大学 | Ball bearing rigidity control device and method for reducing ball bearing rotor transcritical rotation speed amplitude |
| CN104847789B (en) * | 2015-04-10 | 2017-03-08 | 北京理工大学 | A kind of ball bearing rigidity controller and the method for reducing ball bearing rotor Trans-critical cycle rotating speed amplitude |
| CN112013017A (en) * | 2020-09-23 | 2020-12-01 | 核工业理化工程研究院 | Magnetic bearing system with active axial clearance adjustment and control |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141105 Termination date: 20160624 |
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| CF01 | Termination of patent right due to non-payment of annual fee |