CN101771308A - Magnetic levitation rotor support system, magnetic levitation bearing and magnetic biasing weight reducing device - Google Patents
Magnetic levitation rotor support system, magnetic levitation bearing and magnetic biasing weight reducing device Download PDFInfo
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- CN101771308A CN101771308A CN200910138020A CN200910138020A CN101771308A CN 101771308 A CN101771308 A CN 101771308A CN 200910138020 A CN200910138020 A CN 200910138020A CN 200910138020 A CN200910138020 A CN 200910138020A CN 101771308 A CN101771308 A CN 101771308A
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Abstract
The invention discloses a single freedom degree magnetic levitation rotor support system, a magnetic levitation bearing and a magnetic biasing weight reducing device. The single freedom degree magnetic levitation rotor support system is composed of an attraction type axial magnetic levitation bearing (24), attraction type radial magnetic levitation bearings (25,26), magnetic biasing weight reducing devices (27,28) and air gap limit protective devices (29,30) of the axial and radial magnetic levitation bearings which are all arranged in the same movement mechanism. Active cell parts and stator parts of the axial and radial bearings are composed of a permanent magnetic field or a controllable magnetic device not generating non-work air gap magnetic leakage loss. So long as designing margin of the magnetic field is enough, the system of the invention can operate stably without adopting any form of sensor feedback control technology.
Description
Technical field:
The present invention relates to the single-degree-of-freedom magnetic suspension rotor support system in magnetic suspension field.Especially relate to a kind of single-degree-of-freedom magnetic suspension rotor support system that attracts profile shaft to combine that adopts to magnetic suspension bearing and attraction type radial magnetic bearing.The invention still further relates to and attract profile shaft more specifically to magnetic suspension bearing and attraction type radial magnetic bearing.The invention still further relates to the magnetic bias weight reducing device that reduces the rotary body action of gravity and at the limiting and protecting device of footpath, axial magnetic suspension bearing air gap.
Background technology:
For adapting to the development need of ultrahigh speed motor and vacuum clean technology, high-accuracy mechanical process technology and space technology, a kind of magnetic suspension rotor support system of not having the machinery contact, caused people's extensive concern, it is after oil lubrication and gas-lubricated bearing, technological revolution again in industry.This emerging supporting way, the synergy by axial magnetic suspension bearing and radial magnetic bearing is achieved.It has the irreplaceable outstanding advantages of conventional art such as " not having machinery friction, less energy consumption; noise is little; the life-span is long; do not need lubricant medium and sealing and allow rotor high rotating speed to be arranged and adapt to work under high low temperature, vacuum environment ", and becomes one of heat subject of domestic and international many enterprises and R﹠D institution.In recent years, about the scientific research paper and the patent achievement emerge in multitude of magnetic suspension bearing.But with regard to prior art, the key technology of practical magnetic suspension bearing does not break through yet.In various technical schemes, all have technological deficiency in various degree.As: in the middle of the permanent-magnet type magnetic suspension bearing, adopt the suspension mechanism of " same sex is repelled each other ", can cause the generation of uncertain axial force or radial load.In the middle of the electromagnetic type magnetic suspension bearing, the electromagnet and the complicated feedback control technology that then adopt a plurality of entad types to be provided with, but finally can not guarantee on any direction of 360 degree, the automatic aligning and the prior art that realize rotor also exist a large amount of non-working-gaps aspect magnetic Circuit Design, cause the practicality of prior art to reduce.
Summary of the invention:
It is a kind of all by attracting profile shaft to combine to magnetic suspension bearing and attraction type radial magnetic bearing that the present invention will provide exactly, and eliminated solenoid or there is the non-working-gap technological deficiency in permanent magnet, simultaneously, can also make rotor on any direction of 360 degree, obtain the single-degree-of-freedom magnetic suspension rotor support system of automatic aligning function.
In order to realize the purpose of foregoing invention, the present invention adopts following technical scheme: be exactly to attract profile shaft to magnetic suspension bearing is arranged on same motion with at least two attraction type radial magnetic bearings in the middle of at least one, and make the regularity of distribution between them have symmetry.The mover portion and the stator department of each magnetic suspension bearing are separately fixed on the supporting part of central rotary body of system and rotary body, and constitute being rotatably connected of on-mechanical contact by air gap.Axial magnetic suspension bearing with radial air gap is used for retraining moving axially of rotary body.Radial magnetic bearing with axial air-gap, the radial misalignments that is used for retraining rotary body moves, for fear of producing monolateral pulling force, radial magnetic bearing in system all with the form appearance of double-flanged end structure.In the middle of single-degree-of-freedom magnetic suspension rotor support system of the present invention, have the motor or the generator of radial air gap, can be considered and attract profile shaft to magnetic suspension bearing, they have comprised AC-DC motor or double current generator all in the electrical field.Motor or generator with axial air-gap can be considered attraction type radial magnetic bearing.But based on same reason, be regarded as the motor or the generator of attraction type radial magnetic bearing, also only allow to appear within the system with the double-flanged end structure.In the middle of single-degree-of-freedom magnetic suspension rotor support system of the present invention, no matter the magnetic suspension bearing of which kind of type as long as function is identical, just can carry out mutual substituting and replacing according to the needs of design space.
In the present invention, the repulsion type permanent magnetism magnetic suspension bearing that bans use of the plane to cooperate, but the prestressing force magnetic suspension bearing with cone match also can be superimposed upon within the system, but it belongs to unnecessary technical characterictic.
In the present invention, attract profile shaft, comprise: electromagnetic type, permanent-magnet type and have permanent magnetism and the mixed type axial magnetic suspension bearing of two kinds of features of electromagnetism to magnetic suspension bearing.To address respectively below:
(1) electromagnetic type axial magnetic suspension bearing is for having the axial magnetic suspension bearing of radial air gap.It is by being arranged on the rotary body supporting part, and have the annular groove of radial opening and constituted the elementary iron core with annular salient pole by front and back annular magnetic Yoke that this annular groove defined and the solenoid that in annular groove, is provided with, it is formed with being arranged on the rotary body and having the annular groove of radial opening and constituted the secondary iron core with shallow trench annular salient pole by the front and back annular magnetic Yoke that this annular groove defined.Elementary iron core with annular salient pole aligns by air gap mutually with the secondary iron core with shallow trench annular salient pole, and make the air gap both sides corresponding mutually the width of magnetic Yoke pole-face equate.
(2) permanent-magnet type axial magnetic suspension bearing is for having the axial magnetic suspension bearing of radial air gap.It is by being arranged on the rotary body supporting part, and has the annular groove of radial opening and by front and back annular magnetic Yoke that this annular groove defined be arranged within the annular groove, and through the stator department that annular permanent magnet constituted of radial radial magnetizing be positioned on the rotary body with annular salient pole, and have the annular groove of radial opening and by front and back annular magnetic Yoke that this annular groove defined be arranged within the annular groove, and constitute mover portion through the annular permanent magnet of radial radial magnetizing and form with annular salient pole.Stator department with annular salient pole aligns by air gap mutually with the mover portion with annular salient pole, and the pole-face width of both corresponding front and back annular magnetic Yoke is equated and makes both institute's band shape permanent magnets keep the state that attracts each other.Mover portion also can adopt with stator department annular salient pole and substitute with wide plane annular salient pole.
(3) permanent-magnet type axial magnetic suspension bearing is for having the full permanent magnetism axial magnetic suspension bearing of radial air gap.It is by being separately positioned on rotary body and the rotary body supporting part, and permanent magnetism mover portion and permanent-magnet stator portion with same structure form.Permanent magnetism mover portion and permanent-magnet stator portion are again respectively by two or three identical internal and external ga(u)ge lattice, and axially are formed by stacking through the annular permanent magnet of radial radial magnetizing, and closely the polarity of the magnetic field between annular permanent magnet of contact is opposite each other to make each.Permanent magnetism mover portion and permanent-magnet stator portion align mutually by radial air gap, and make both air-gap fields become the state that attracts each other.For fear of the generation of stray field, and, cover by the soft iron yoke at non-working-gap one end of permanent magnetism mover portion and permanent-magnet stator portion.
(4) lead passive mixed type axial magnetic suspension bearing, be the passive mixed type axial magnetic suspension bearing of master with radial air gap.It is by being arranged on the rotary body supporting part, and have the annular permanent magnet of radial port annular groove and be arranged on the stator department that solenoid constituted in the middle of the annular permanent magnet groove and be arranged on the rotary body, have the mover portion that the annular permanent magnet of radial port annular groove or plane soft iron annular salient pole or the shallow trench soft iron annular salient pole identical with the stator department pole-face constituted and form.Be positioned in the middle of the annular permanent magnet groove the flow direction that solenoid produced with have the radial port annular permanent magnet intrinsic flow direction be consistent.
In the present invention, attraction type radial magnetic bearing comprises: electromagnetic type, permanent-magnet type and have permanent magnetism and the mixed type radial magnetic bearing of two kinds of features of electromagnetism.Will address respectively below:
(1) electromagnetic type radial magnetic bearing is for having the radial magnetic bearing of axial air-gap.It is by being arranged on the rotary body supporting part, and has the annular groove of axially open and constituted elementary iron core with annular salient pole by inside-and-outside ring magnetic Yoke that this annular groove defined and the solenoid that is provided with in annular groove and form with being arranged on the rotary body and having the annular groove of axially open and constituted the secondary iron core with shallow trench annular salient pole by the inside-and-outside ring magnetic Yoke that this annular groove defined.Elementary iron core with annular salient pole aligns by air gap mutually with the secondary iron core with shallow trench annular salient pole, and make the air gap both sides corresponding mutually the width of magnetic Yoke pole-face equate.Secondary iron core also can adopt the plane soft iron annular salient pole that equates with elementary width unshakable in one's determination to substitute.When if desired the electromagnetic type radial magnetic bearing being arranged between the axle head of rotary body and the rotary body supporting part, then be on the pairing rotary body of rotary body axle head supporting part, be provided with one and formed by center main pole and peripheral annular secondary magnetic pole and the elementary stator department that solenoid constituted and having that is arranged between the major-minor magnetic pole with the rotary body axle end face of elementary stator department annular secondary magnetic pole equal diameters.Both align and make it to have symmetrical teeth groove pole-face by air gap.
(2) permanent-magnet type radial magnetic bearing is for having the radial magnetic bearing of axial air-gap.It is by being arranged on the rotary body supporting part, and has the annular groove of axially open and by inside-and-outside ring magnetic Yoke that this annular groove defined be provided with between the inside-and-outside ring magnetic Yoke, and constitute stator department through the annular permanent magnet of axial charging and be positioned on the rotary body, and have the mover portion identical and form with annular salient pole stator department structure with annular salient pole.Mover portion also can adopt the plane soft iron annular salient pole institute that equates with annular salient pole stator department inside-and-outside ring magnetic Yoke utmost point well width to substitute.When if desired the permanent-magnet type radial magnetic bearing being arranged between the axle head of rotary body and the rotary body supporting part, then be on the pairing rotary body of rotary body axle head supporting part, be provided with one and have the permanent-magnet stator portion of peripheral annular magnetic Yoke and form by the rotary body axle end face of air gap and permanent-magnet stator portion annular secondary magnetic pole equal diameters.Also can make both have the magnetic pole strength of same structure and make permanent magnet that both are with keep the attraction state.
(3) permanent-magnet type radial magnetic bearing is for having the full permanent magnetic radial magnetic suspension bearing of axial air-gap.It is by being separately positioned on rotary body and the rotary body supporting part, and permanent magnetism mover portion and permanent-magnet stator portion with same structure form.Permanent magnetism mover portion and permanent-magnet stator portion are again also to be formed through the tight suit of annular permanent magnet of axial charging by two or three different inner diameters respectively.And make the polarity of the magnetic field of inside-and-outside ring permanent magnet of tight contact opposite each other.Permanent magnetism mover portion and permanent-magnet stator portion align mutually by axial air-gap, and make both air-gap fields remain on the state of attracting each other.For fear of the generation of stray field, and, cover by the soft iron yoke at non-working-gap one end of permanent magnetism mover portion and permanent-magnet stator portion.
(4) lead passive mixed type radial magnetic bearing, be the passive mixed type radial magnetic bearing of master with axial air-gap.It is by being arranged on the rotary body supporting part, and have the annular permanent magnet of axial port annular groove and be arranged on the stator department that solenoid constituted in the middle of the annular permanent magnet groove and be arranged on the rotary body, have the mover portion that the annular permanent magnet of axial port annular groove or plane soft iron annular salient pole or the shallow trench soft iron annular salient pole identical with the stator department pole-face constituted and form.Be positioned in the middle of the annular permanent magnet groove the flow direction that solenoid produced with have the axial port annular permanent magnet intrinsic flow direction be consistent.
In the middle of single-degree-of-freedom magnetic suspension rotor support system of the present invention, the attraction profile shaft that is adopted can be single integral body to the stator department and the mover portion of magnetic suspension bearing and attraction type radial magnetic bearing, also can be combined member.Can be independently to be fixed on the supporting part of rotary body and rotary body, also can employing and rotary body and rotary body supporting part carry out whole complex form between the same material
In the middle of single-degree-of-freedom magnetic suspension rotor support system of the present invention, the magnetic suspension bearing that function is identical, except alternative and displacement that can be mutual, use can also side by side or superpose.As: in the periphery of permanent-magnet type radial magnetic bearing, electromagnetic type radial magnetic bearing arranged side by side again, or on the both sides of electromagnetic type axial magnetic suspension bearing, permanent-magnet type axial magnetic suspension bearing arranged side by side again.
In the middle of single-degree-of-freedom magnetic suspension rotor support system of the present invention, and be not precluded within when adopting magnetic suspension bearing, use the Mechanical Contact bearing.Because these additional Mechanical Contact bearings through the operation break-in, can be automatically changeb to the mechanical protection bearing of magnetic suspension rotor support system.Thereby can avoid when unexpected thrashing or braking sedimentation, causing the hidden danger of mechanical friction welding.So it is maglev supporting way that this structure still belongs to.
In the middle of single-degree-of-freedom magnetic suspension rotor support system of the present invention, the gravity load of the rotary body that uses for the rotary body that reduces vertical use or level to attracting profile shaft to produce to magnetic suspension bearing or attraction type radial magnetic bearing.The magnetic bias weight reducing device of single side type can also be set in system.Division is as follows:
(1) when having determined that rotary body is the level use, promptly on the position of the downward one side in rotary body both sides institute corresponding rotation body supporting part, setting has the annular yoke of radial opening and is positioned within the annular yoke, the stator department that is constituted through the semicircular ring permanent magnet of radial radial magnetizing be arranged on the rotary body and have the annular yoke of radial opening and be arranged in the middle of the annular yoke, and form through the mover portion that the annular permanent magnet of radial radial magnetizing is constituted.The state that mover portion and stator department align mutually and its formation is attracted each other by air gap.Mover portion also can adopt with stator department annular magnetic yoke axle and substitute to the soft iron annular plane salient pole that width equates.In the middle of the present invention, if when rotary body is external rotor, the opening that then is positioned at the annular yoke on the stator department is export-oriented and the opening that is positioned at the semicircular ring permanent magnet in the middle of the annular yoke is upwards installed.When if rotary body is internal rotor, the opening that then is positioned at the annular yoke on the stator department is internally-oriented and is positioned at semicircular ring permanent magnet in the middle of the annular yoke Open Side Down and install.
(2) when having determined that rotary body is the plumbness use, promptly on the position of the downward one side in rotary body institute corresponding rotation body supporting part, setting has the downward annular groove of axially open and by inside-and-outside ring magnetic Yoke that this annular groove defined be provided with between the inside-and-outside ring magnetic Yoke, and the annular permanent magnet of process axial charging constitutes the stator department with annular salient pole, simultaneously, also on the pairing rotary body of annular salient pole stator department, setting has and the identical mover portion of annular salient pole stator department structure.Mover portion and stator department align mutually and form by air gap and attract each other.Mover portion also can adopt the plane soft iron annular salient pole institute that equates with annular salient pole stator department inside-and-outside ring magnetic Yoke utmost point well width to substitute.Stator department is substituted by the annular permanent magnet that does not have peripheral magnetic conduction Yoke.If what use in system is double-flanged end permanent magnetic radial magnetic suspension bearing, also can adopt the magnetic field force that increases the radial magnetic bearing that rotary body upwards attracted, reach the purpose that reduces or offset rotary body gravity.
In the middle of single-degree-of-freedom magnetic suspension rotor support system of the present invention, attract the air gap flux density of profile shaft in order to strengthen to magnetic suspension bearing and attraction type radial magnetic bearing, can also be at them on the magnetic pole strength of each automatic stator department, be subdivided into many abreast according to original trend, and guarantee that the magnetic pole strength after the segmentation is symmetrical in the air gap both sides.It also can be unified constriction to former moving stator pole face.
In the middle of single-degree-of-freedom magnetic suspension rotor support system of the present invention, the permanent magnet material that is adopted is made a general reference all and magnetisablely is the material of permanent magnet, is not limited to known permanent magnet material, also comprises following newfound Hard Magnetic and rectangular hysteresis material.
In the middle of single-degree-of-freedom magnetic suspension rotor support system of the present invention; in order to prevent to attract the moving stator department of profile shaft to magnetic suspension bearing and attraction type radial magnetic bearing and single side type magnetic bias weight reducing device; in the middle of installation or running; the phenomenon of adhesive " sticking dead " takes place when having an accident; can also between the supporting part of rotary body and rotary body, the air gap limiting and protecting device of footpath axial magnetic suspension bearing or magnetic bias weight reducing device be set.The mover portion and the stator department of the air gap limiting and protecting device of this footpath axial magnetic suspension bearing or magnetic bias weight reducing device; be separately positioned on the supporting part of the rotary body of construction system and rotary body, and decide mover separately with reference to air gap by what design less than protection magnetic suspension bearing or magnetic bias weight reducing device.
In the middle of single-degree-of-freedom magnetic suspension rotor support system of the present invention, strictness forbids adopting the repulsion type magnetic bearing of plane cooperation, so long as the magnetic energy allowance or the current stiffness of attraction type magnetic suspension bearing design are enough, realize the stable operation of system with regard to the participation that do not need any position transducer and controller.
In the middle of single-degree-of-freedom magnetic suspension rotor support system of the present invention, the feedback controling mode of not getting rid of the use location transducer, but its employed number of sensors at most can be above two, one is the radial position transducer, and one is the axial location transducer.The structure of their structure and electromagnetic type radial magnetic bearing or axial magnetic suspension bearing is identical.As the radial position transducer, formed with being arranged on the rotary body and having the annular groove of axially open and constituted secondary iron core with shallow trench annular salient pole by the inside-and-outside ring magnetic Yoke that this annular groove defined by being arranged on the rotary body supporting part and having the annular groove of axially open and constituted elementary iron core by inside-and-outside ring magnetic Yoke that this annular groove defined and the inductance coil that in annular groove, is provided with annular salient pole.Elementary iron core with annular salient pole aligns by air gap mutually with the secondary iron core with shallow trench annular salient pole, and make the air gap both sides corresponding mutually the width of magnetic Yoke pole-face equate.Secondary iron core also can adopt the plane soft iron annular salient pole that equates with elementary width unshakable in one's determination to substitute.When if desired the magnetic resistance type inductive position sensor being arranged between the axle head of rotary body and the rotary body supporting part, then be on the pairing rotary body of rotary body axle head supporting part, be provided with one and formed by center main pole and peripheral annular secondary magnetic pole and the elementary stator department that inductance coil constituted and having that is arranged between the major-minor magnetic pole with the rotary body axle end face of elementary stator department annular secondary magnetic pole equal diameters.Both align and make it to have symmetrical teeth groove pole-face by air gap.And the axial location transducer, then be by being arranged on the rotary body supporting part, and have the annular groove of radial opening and constituted the elementary iron core with annular salient pole by front and back annular magnetic Yoke that this annular groove defined and the inductance coil that in annular groove, is provided with, it is formed with being arranged on the rotary body and having the annular groove of radial opening and constituted the secondary iron core with shallow trench annular salient pole by the front and back annular magnetic Yoke that this annular groove defined.Elementary iron core with annular salient pole aligns by air gap mutually with the secondary iron core with shallow trench annular salient pole, and make the air gap both sides corresponding mutually the width of magnetic Yoke pole-face equate.
In the present invention, footpath axial location transducer also can adopt the complex form with the footpath axial magnetic suspension bearing, that is: increase an inductance coil again in the middle of the annular groove on radial magnetic bearing or the elementary iron core of axial magnetic suspension bearing and realize.During work, position transducer relies on the dislocation between radial magnetic bearing or the moving stator pole face of axial magnetic suspension bearing to move, the inductance that is produced changes outside output signal, and guarantees the stable operation of system by the electric current that controller in time increases the controllable electromagnetic bearing.This is a kind ofly not have the direction notion and have radially or the change magnetic resistance differential pick-up of axial magnetic suspension bearing feature.Also can realize effective control by differential transformation mode to system.
In sum, single-degree-of-freedom magnetic suspension rotor support system of the present invention is with respect to prior art.Have following beneficial effect:
(1) in the middle of single-degree-of-freedom magnetic suspension rotor support system of the present invention, the potential destabilizing factor of footpath axial magnetic suspension bearing itself is eliminated and avoided to the repulsion type permanent magnetism magnetic suspension bearing that strictness bans use of the plane to cooperate.
(2) the non-working-gap side of permanent magnet in the middle of magnetic suspension bearing or solenoid is all surrounded by the soft iron yoke, has avoided unnecessary magnetic circuit to lose and improved the efficient of magnetic energy utilization effectively.
(3) in the middle of magnetic suspension bearing, between moving, the stator pole face of establishing relatively by air gap, keeping the symmetry of height, because the existence of slot effect makes the dislocation of any direction between the two move the moment that all can induce automatic recovery.So, as long as the magnetic force allowance of permanent-magnet type magnetic suspension bearing current stiffness enough or the electromagnetic type magnetic suspension bearing is enough, just can any type of sensor feedback control technology, and make system's maintenance stable operation.
(4) because the use of single side type permanent-magnet bias weight reducing device, reduced the gravity load of rotary body diameter, axial magnetic suspension bearing effectively.Thereby the energy consumption of system is reduced.
(5) because the use of air gap limiting and protecting device has avoided the central moving stator of footpath, axial magnetic suspension bearing and single side type permanent-magnet bias weight reducing device to produce the phenomenon of unexpected adhesive " sticking dead " effectively.Thereby increased the reliability of system.
Description of drawings:
The accompanying drawing that presents provided is only represented architectural feature and corresponding relation, and the scale of representative products structure not.Motor in the accompanying drawing is also only represented first position extremely unshakable in one's determination.
Fig. 1 is the cutaway view that the hollow dead axle (mark) of a kind of double-flanged end external rotor disc-type electric motor that is composited by two single side type external rotor disc types (1,2) motor and an electromagnetic type axial magnetic suspension bearing (3) and two mechanical protection bearings (4,5) and double-flanged end external rotor disc-type electric motor is constituted single-degree-of-freedom magnetic suspension rotor support system.
Fig. 2 be a kind of by two single side type internal rotor disc-type electric motors (6,7) and two permanent magnetism axial magnetic suspension bearings (8,9) and two have the permanent magnetism single side type magnetic bias weight reducing device (10,11) of radial air gap and directly the air gap limiting and protecting device (12,13) of axial magnetic suspension bearing constituted the cutaway view of single-degree-of-freedom magnetic suspension rotor support system.
Fig. 3 is a kind of cutaway view that is made of single-degree-of-freedom magnetic suspension rotor support system internal rotor pillar motor (16) and electromagnetic type radial magnetic bearing (14,15) and mechanical protection bearing (17,18).
Fig. 4 is a kind of cutaway view of the single-degree-of-freedom magnetic suspension rotor support system that is made of the air gap limiting and protecting device (56,57) of external rotor pillar motor (19) and permanent-magnet type radial magnetic bearing (20,21) and permanent magnetism single side type magnetic bias weight reducing device (22,23) with radial air gap and footpath axial magnetic suspension bearing.
Fig. 5 is a kind of by internal rotor pillar motor (24) and permanent-magnet type radial magnetic bearing (25,26) and have the permanent magnetism single side type magnetic bias weight reducing device (27,28) of radial air gap and the cutaway view of the single-degree-of-freedom magnetic suspension rotor support system that constituted of air gap limiting and protecting device (29,30) of footpath axial magnetic suspension bearing.
Fig. 6 is a kind of by external rotor pillar motor (31) and permanent-magnet type radial magnetic bearing (32,33) and have permanent magnetism single side type magnetic bias weight reducing device (34) and the footpath air gap limiting and protecting device (35,36) of axial magnetic suspension bearing and the cutaway view that mechanical protection bearing (37) is constituted single-degree-of-freedom magnetic suspension rotor support system of axial air-gap.
Fig. 7 is a kind of by external rotor pillar motor (38) and the permanent-magnet type axial magnetic suspension bearing (39,40) and the permanent-magnet type radial magnetic bearing (41,42) that use side by side with have the cutaway view that the permanent magnetism single side type magnetic bias weight reducing device (43) of axial air-gap and the air gap limiting and protecting device (44,45) of axial magnetic suspension bearing are directly constituted single-degree-of-freedom magnetic suspension rotor support system.
Fig. 8 is a kind of air gap limiting and protecting device (53,54) and the hollow dead axle of stator (55) of external rotor single side type disc-type electric motor cutaway view of being constituted single-degree-of-freedom magnetic suspension rotor support system by a plurality of external rotor single side type disc-type electric motors (46,47,48,49) and permanent-magnet type axial magnetic suspension bearing (50,51) and permanent magnetism single side type magnetic bias weight reducing device (52) with axial air-gap and footpath axial magnetic suspension bearing.
Fig. 9 be a kind of single-degree-of-freedom magnetic suspension rotor support system that is constituted by the internal rotor pillar motor (58) with radial air gap and two single side type permanent magnetic radial magnetic suspension bearings (59,60) partly cut open figure.Wherein, in order to reduce the gravity load of rotary body to axial magnetic suspension bearing, adopt to increase rotary body upwards one side and in the rotary body supporting part volume of the magnetic buble material of the permanent-magnet type radial magnetic bearing (60) between the one side downwards, make system produce a monolateral pulling force that upwards attracts rotary body.Thereby, single side type magnetic bias weight reducing device is set no longer separately.
Figure 10 be a kind of vertical single-degree-of-freedom magnetic suspension rotor support system that is constituted by the external rotor pillar motor (61) with radial air gap and two single side type permanent magnetic radial magnetic suspension bearings (62,63) partly cut open figure.Wherein, in order to reduce the gravity load of rotary body to axial magnetic suspension bearing, adopt to increase rotary body upwards one side and in the rotary body supporting part volume of the magnetic buble material of the permanent-magnet type radial magnetic bearing (62) between the one side downwards, make system produce a monolateral pulling force that upwards attracts rotary body.Thereby, single side type magnetic bias weight reducing device is set no longer separately.
Figure 11 be a kind of be the horizontal single-degree-of-freedom magnetic suspension rotor support system that is constituted by two full permanent magnetism axial magnetic suspension bearings (66,67) and two full permanent magnetic radial magnetic suspension bearings (68,69).Wherein, inner rotor motor that uses side by side as axial magnetic suspension bearing and the single side type magnetic bias weight reducing device with radial air gap do not show in the drawings.
Figure 12 be a kind of horizontal single-degree-of-freedom magnetic suspension rotor support system that is constituted by two full permanent magnetism axial magnetic suspension bearings (72,73) and two full permanent magnetic radial magnetic suspension bearings (75,75) partly cut open figure.Wherein, outer rotor motor that uses side by side as axial magnetic suspension bearing and the single side type magnetic bias weight reducing device with radial air gap do not show in the drawings.
Embodiment:
Below in conjunction with description of drawings, single-degree-of-freedom magnetic suspension rotor support system of the present invention is further described with embodiment.
According to shown in Figure 1, single-degree-of-freedom magnetic suspension rotor support system of the present invention is to have the external rotor single side type disc type reluctance motor 1 of axial air-gap and 2 stator department with two, and back-to-back being combined with each other makes it become two modification structures.Then, on the middle part in the double-flanged end disc type reluctance motor stator department outside, the elementary iron core of electromagnetic type axial magnetic suspension bearing 3 is set and the secondary iron core of electromagnetic type axial magnetic suspension bearing 3 is set on the pairing motor housing of elementary iron core.Align and make both magnetic pole strength width to equate at the shallow slot that has internally-oriented radial opening on the secondary iron core and by air gap mutually with export-oriented annular groove on the elementary iron core.Simultaneously; also between the stator dead axle of two mover end caps of external rotor single side type disc type reluctance motor and external rotor single side type disc type reluctance motor; be provided with mechanical protection bearing 4 and 5, the winding conducting wire of external rotor single side type disc type reluctance motor and electromagnetic type axial magnetic suspension bearing is outwards drawn by the hollow dead axle of external rotor single side type disc type reluctance motor.
According to shown in Figure 2; the horizontal single-degree-of-freedom magnetic suspension rotor of the present invention support system; be that two single side type internal rotor disc type reluctance motors 5 and 6 with axial air-gap are compound for after the bilateral property; be arranged on the middle part of rotary body and rotary body supporting part; simultaneously; between the peripheral supporting part of the axostylus axostyle of disc type reluctance motor and axostylus axostyle thereof, symmetry be provided with two permanent-magnet type axial magnetic suspension bearings 8 with radial air gap and 9 with the air gap limiting and protecting device 12 of axial magnetic suspension bearing directly and 13 and have a permanent magnetism single side type magnetic bias weight reducing device 10 and 11 of radial air gap.
According to shown in Figure 3; the horizontal single-degree-of-freedom magnetic suspension rotor of the present invention support system; be that an internal rotor pillar motor 16 with radial air gap is arranged on the middle part of rotary body and rotary body supporting part; simultaneously; on the position of pillar motor rotor two ends and End cover for motor; be provided with electromagnetic type radial magnetic bearing 14 and 15 with axial air-gap; mechanical protection bearing 17 and 18 are set between motor rotor axostylus axostyle and electric motor end cap, between rotor and electric motor end cap, also are provided with the air gap protective device (not shown) of radial magnetic bearing.Present embodiment has also adopted hollow rotor in order to reduce the weight of rotary body.
According to shown in Figure 4; the horizontal single-degree-of-freedom magnetic suspension rotor of the present invention support system; be that an external rotor pillar motor 19 with radial air gap is arranged on the middle part of rotary body and rotary body, and between rotary body rotary body supporting part the symmetry be provided with permanent-magnet type radial magnetic bearing 20 and 21 and have radial air gap permanent magnetism single side type magnetic bias weight reducing device 22 and 23 and the footpath axial magnetic suspension bearing air gap limiting and protecting device 56 and 57.After the winding conducting wire of motor passes supporter, outwards draw from the hollow dead axle of motor.
According to shown in Figure 5, the horizontal single-degree-of-freedom magnetic suspension rotor of the present invention support system is internal rotor pillar motor 24 and two the self-balancing double-flanged end permanent-magnet type radial magnetic bearings that single side type permanent-magnet type radial magnetic bearing 25 and 26 shared cylindrical permanent magnet constitute that have radial air gap with.Simultaneously, permanent magnetism single side type magnetic bias weight reducing device 27 with radial air gap and 28 and the air gap limiting and protecting device 29 and 30 of footpath axial magnetic suspension bearing also are set between motor shaft and end cap.
According to shown in Figure 6, the vertical single-degree-of-freedom magnetic suspension rotor of the present invention support system, be that an external rotor pillar generator 31 with radial air gap is arranged on the centre position of rotary body and rotary body supporting part, the self-balancing double-flanged end permanent-magnet type radial magnetic bearing that then two single side type permanent-magnet type radial magnetic bearings 32 and 33 is merged the back formation is arranged on the inboard of pillar generator 31.Simultaneously, also on the top of external rotor rotary body, the air gap limiting and protecting device 35 and 36 that is provided with the permanent magnetism single side type magnetic bias weight reducing device 34 that the external rotor rotary body is upwards attracted and the footpath axial magnetic suspension bearing is set between rotary body and rotary body supporting part.In addition, also be provided with mechanical protection bearing 37 in the bottom of external rotor rotary body.The winding conducting wire of motor is outwards drawn from the hollow dead axle of motor after passing supporter.
According to shown in Figure 7, the vertical single-degree-of-freedom magnetic suspension rotor of the present invention support system is that external rotor pillar generator 38 and two the permanent-magnet type axial magnetic suspension bearings 39 and 40 with radial air gap with radial air gap are arranged between the supporting part of rotary body and rotary body side by side.Simultaneously,, be provided with the permanent magnetism single side type magnetic bias weight reducing device 43 that the external rotor rotary body is upwards attracted, in addition, also in system, be provided with the air gap limiting and protecting device 44 and 45 of footpath axial magnetic suspension bearing also on the top of external rotor rotary body.The winding conducting wire of motor is outwards drawn from the hollow dead axle of motor after passing supporter.
According to shown in Figure 8, the vertical single-degree-of-freedom magnetic suspension rotor of the present invention support system is that a plurality of permanent-magnet type axial magnetic suspension bearings 50 and 51 that have the external rotor single side type disk generator 46,47,48,49 of axial air-gap and have a radial air gap are arranged between the supporting part of rotary body and rotary body side by side.Simultaneously,, be provided with the permanent magnetism single side type magnetic bias weight reducing device 52 that rotary body is upwards attracted, in addition, also in system, be provided with the air gap limiting and protecting device 53 and 54 of footpath axial magnetic suspension bearing also on the top of rotary body.The winding conducting wire of motor is outwards drawn by the hollow dead axle on the rotary body supporting part.
According to shown in Figure 9, the vertical single-degree-of-freedom magnetic suspension rotor of the present invention support system is internal rotor pillar motor 58 and two single side type permanent magnetic radial magnetic suspension bearings 59 and 60 compositions that have radial air gap with.Wherein, in order to reduce the gravity load of rotary body to axial magnetic suspension bearing, adopt to increase rotary body upwards one side and in the rotary body supporting part volume of the magnetic buble material of the permanent-magnet type radial magnetic bearing 60 between the one side downwards, make system produce a monolateral pulling force that upwards attracts rotary body.Thereby, single side type magnetic bias weight reducing device is set no longer separately.
According to shown in Figure 10, the vertical single-degree-of-freedom magnetic suspension rotor of the present invention support system is external rotor pillar motor 61 and two single side type permanent magnetic radial magnetic suspension bearings 62 and 63 compositions that have radial air gap with.Wherein, in order to reduce the gravity load of rotary body to axial magnetic suspension bearing 61, adopt to increase rotary body upwards one side and in the rotary body supporting part volume of the magnetic buble material of the permanent-magnet type radial magnetic bearing 62 between the one side downwards, make system produce a monolateral pulling force that upwards attracts rotary body.Thereby, single side type magnetic bias weight reducing device is set no longer separately.The winding conducting wire of external rotor pillar motor 61 is outwards drawn from the rotary body dead axle of hollow.
According to shown in Figure 11, the horizontal single-degree-of-freedom magnetic suspension rotor of the present invention support system is made up of two full permanent magnetism axial magnetic suspension bearings 66 and 67 and two full permanent magnetic radial magnetic suspension bearings 68 and 69.Full permanent magnetism axial magnetic suspension bearing 66 and 67 permanent magnetism mover portion and permanent-magnet stator portion, by being separately positioned on rotary body and the rotary body supporting part, and permanent magnetism mover portion and permanent-magnet stator portion with same structure form.Permanent magnetism mover portion and permanent-magnet stator portion are again respectively by three identical internal and external ga(u)ge lattice, and axially are formed by stacking through the annular permanent magnet of radial radial magnetizing, and make the polarity of the magnetic field between each closely adjacent annular permanent magnet opposite each other.Permanent magnetism mover portion and permanent-magnet stator portion align mutually by radial air gap, and make both air-gap fields become the state that attracts each other.Full permanent magnetic radial magnetic suspension bearing 68 and 69 permanent magnetism mover portion and permanent-magnet stator portion are formed by three different inner diameters and the tight suit of annular permanent magnet that passes through axial charging respectively.And make the polarity of the magnetic field of inside-and-outside ring permanent magnet of tight contact opposite each other.Permanent magnetism mover portion and permanent-magnet stator portion align mutually by axial air-gap, and make both air-gap fields remain on the state of attracting each other.For fear of full permanent magnetic radial magnetic suspension bearing 68 and 69 and full permanent magnetism axial magnetic suspension bearing 66 and the 67 magnetic circuit losses that produce non-working-gaps, the non-working-gap end at them is all covered by soft iron material.70 and 71 is the air gap limiting and protecting device of full permanent-magnetic radial/axial magnetic suspension bearing.
According to shown in Figure 12, the horizontal single-degree-of-freedom magnetic suspension rotor of the present invention support system is made up of two full permanent magnetism axial magnetic suspension bearings 72 and 73 and two full permanent magnetic radial magnetic suspension bearings 74 and 75.Full permanent magnetism axial magnetic suspension bearing 72 and 73 permanent magnetism mover portion and permanent-magnet stator portion, by being separately positioned on rotary body and the rotary body supporting part, and permanent magnetism mover portion and permanent-magnet stator portion with same structure form.Permanent magnetism mover portion and permanent-magnet stator portion are again respectively by two identical internal and external ga(u)ge lattice, and axially are formed by stacking through the annular permanent magnet of radial radial magnetizing, and make the polarity of the magnetic field between each closely adjacent annular permanent magnet opposite each other.Permanent magnetism mover portion and permanent-magnet stator portion align mutually by radial air gap, and make both air-gap fields become the state that attracts each other.Full permanent magnetic radial magnetic suspension bearing 74 and 75 permanent magnetism mover portion and permanent-magnet stator portion are formed by two different inner diameters and the tight suit of annular permanent magnet that passes through axial charging respectively.And make the polarity of the magnetic field of inside-and-outside ring permanent magnet of tight contact opposite each other.Permanent magnetism mover portion and permanent-magnet stator portion align mutually by axial air-gap, and make both air-gap fields remain on the state of attracting each other.For fear of full permanent magnetic radial magnetic suspension bearing 74 and 75 and full permanent magnetism axial magnetic suspension bearing 72 and 73 produce the dispersion loss of non-working-gaps, the end of non-working-gap at them is all covered by soft iron material.76 and 77 is the air gap limiting and protecting device of full permanent-magnetic radial/axial magnetic suspension bearing.
Claims (12)
1. single-degree-of-freedom magnetic suspension rotor support system, by being arranged in the middle of the same motion, at least one attracts profile shaft to form to magnetic suspension bearing and at least two attraction type radial magnetic bearings.The mover portion and the stator department of each magnetic suspension bearing are individually fixed on the supporting part of the rotary body of composition system and rotary body, and constitute being rotatably connected of on-mechanical contact by air gap.Attract profile shaft to magnetic suspension bearing and attraction type radial magnetic bearing, comprise: electromagnetic type, permanent-magnet type and have permanent magnetism and the hybrid magnetic suspension bearing of two kinds of features of electromagnetism.In the middle of single-degree-of-freedom magnetic suspension rotor support system, have the motor or the generator of radial air gap, can be considered and attract profile shaft to magnetic suspension bearing, they have comprised AC-DC motor or double current generator all in the electrical field.Motor or generator with axial air-gap can be considered attraction type radial magnetic bearing.For fear of the generation of monolateral pulling force, this motor or the generator that is regarded as attraction type radial magnetic bearing, the same with the attraction type radial magnetic bearing of other type, all the structure with double-flanged end appears within the system.No matter the magnetic suspension bearing of which kind of type as long as their functions are identical, just can carry out mutual substituting and replacing according to the needs of design space.It is characterized in that: described attraction profile shaft is the electromagnetic type axial magnetic suspension bearing to magnetic suspension bearing (3).It is by being arranged on the rotary body supporting part, and have the annular groove of radial opening and constituted elementary iron core by front and back annular magnetic Yoke that this annular groove defined and the solenoid that in annular groove, is provided with and be arranged on the rotary body, and have the annular groove of radial opening and constituted secondary iron core and form with shallow trench annular salient pole by the front and back annular magnetic Yoke that this annular groove defined with annular salient pole.Have the elementary iron core and secondary iron core of annular salient pole, align and make the pole-face width of both front and back annular magnetic Yoke identical mutually by air gap with shallow trench annular salient pole.
2. according to the described single-degree-of-freedom magnetic suspension rotor of claim 1 support system.It is characterized in that: described attraction profile shaft is the permanent-magnet type axial magnetic suspension bearing to magnetic suspension bearing (8,9 or 39,40 or 50,51).It is by being arranged on the rotary body supporting part, and has the annular groove of radial opening and by front and back annular magnetic Yoke that this annular groove defined be arranged in the annular groove, and constitute stator department through the annular permanent magnet of radial radial magnetizing and be positioned on the rotary body with annular salient pole, and have the annular groove of radial opening and by front and back annular magnetic Yoke that this annular groove defined be arranged in the annular groove, and constitute mover portion through the annular permanent magnet of radial radial magnetizing and form with annular salient pole.Stator department with annular salient pole aligns by air gap mutually with the mover portion with annular salient pole, and the pole-face width of both corresponding front and back annular magnetic Yoke is equated and makes between both institute's band shape permanent magnets, keeps the state that attracts each other.
3. according to the described single-degree-of-freedom magnetic suspension rotor of claim 1 support system.It is characterized in that: described attraction profile shaft is full permanent magnetism axial magnetic suspension bearing to magnetic suspension bearing (66,67 or 72,73).It is by being separately positioned on rotary body and the rotary body supporting part, and permanent magnetism mover portion and permanent-magnet stator portion with same structure form.Permanent magnetism mover portion and permanent-magnet stator portion are again respectively by two or three identical internal and external ga(u)ge lattice, and axially are formed by stacking through the annular permanent magnet of radial radial magnetizing, and make the polarity of the magnetic field between each closely adjacent annular permanent magnet opposite each other.Permanent magnetism mover portion and permanent-magnet stator portion align mutually by radial air gap, and make both air-gap fields become the state that attracts each other.For fear of the generation of stray field, and, cover by the soft iron yoke at non-working-gap one end of permanent magnetism mover portion and permanent-magnet stator portion.
4. according to the described single-degree-of-freedom magnetic suspension rotor of claim 1 support system.It is characterized in that: described radial magnetic bearing (14,15) is the electromagnetic type radial magnetic bearing.It is by being arranged on the rotary body supporting part, and have the annular groove of axially open and constituted elementary iron core by inside-and-outside ring magnetic Yoke that this annular groove defined and the solenoid that in annular groove, is provided with and be arranged on the rotary body, and have the annular groove of axially open and constituted secondary iron core and form with annular salient pole by the shallow trench annular magnetic Yoke that this annular groove defined with annular salient pole.Elementary iron core with annular salient pole aligns by air gap mutually with the secondary iron core with shallow trench annular salient pole, and the pole-face width of both corresponding inside-and-outside ring magnetic Yoke is equated.When if desired the electromagnetic type radial magnetic bearing being arranged between the axle head of rotary body and the rotary body supporting part, then be on the pairing rotary body of rotary body axle head supporting part, be provided with one and formed by center main pole and peripheral annular secondary magnetic pole and the elementary stator department that solenoid constituted and having that is arranged between the major-minor magnetic pole with the rotary body axle end face of the major and minor magnetic pole equal diameters of elementary stator department.Both align by air gap and have a symmetrical teeth groove interface.
5. according to the described single-degree-of-freedom magnetic suspension rotor of claim 1 support system.It is characterized in that: described attraction type radial magnetic bearing (20,21 or 25,26 or 32,33 or 41,42) is the permanent-magnet type radial magnetic bearing.It is by being arranged on the rotary body supporting part, and has the annular groove of axially open and by inside-and-outside ring magnetic Yoke that this annular groove defined be arranged in the annular groove, and constitute the stator department with annular salient pole and be positioned on the rotary body and have the annular groove of axially open and by inside-and-outside ring magnetic Yoke that this annular groove defined be arranged on annular groove through the annular permanent magnet of axial charging, and the annular permanent magnet that passes through axial charging constitutes the mover portion with annular salient pole and forms.Stator department with annular salient pole aligns by air gap mutually with the mover portion with annular salient pole, and the pole-face width of both corresponding inside-and-outside ring magnetic Yoke is equated and both institute's band shape permanent magnets between, keep the state that attracts each other.When if desired the permanent-magnet type radial magnetic bearing being arranged between the axle head of rotary body and the rotary body supporting part, then be on the pairing rotary body of rotary body axle head supporting part, be provided with one and have the solid cylinder permanent-magnet stator portion of outer magnetic Yoke and form by the rotary body axle end face of air gap and solid cylinder permanent-magnet stator portion equal diameters.Also can make both have the teeth groove interface of same structure and make both the state that keep to attract with permanent magnet.
6. according to the described single-degree-of-freedom magnetic suspension rotor of claim 1 support system.It is characterized in that: described attraction type radial magnetic bearing (68,69 or 74,75) is full permanent magnetic radial magnetic suspension bearing.It is by being separately positioned on rotary body and the rotary body supporting part, and permanent magnetism mover portion and permanent-magnet stator portion with same structure form.Permanent magnetism mover portion and permanent-magnet stator portion are again also to be formed through the tight suit of annular permanent magnet of axial charging by two or three different inner diameters respectively.And make the polarity of the magnetic field of inside-and-outside ring permanent magnet of tight contact opposite each other.Permanent magnetism mover portion and permanent-magnet stator portion align mutually by axial air-gap, and make both air-gap field keep the state attract each other.For fear of the generation of stray field, and, cover by the soft iron yoke at non-working-gap one end of permanent magnetism mover portion and permanent-magnet stator portion.
7. according to claim 1,2,3,4,5,6 described any single-degree-of-freedom magnetic suspension rotor support systems.It is characterized in that: at described attraction profile shaft in the middle of magnetic suspension bearing (3 or 8,9 or 39,40 or 50,51) and attraction type radial magnetic bearing (14,15 or 20,21 or 25,26 or 32,33 or 41,42), have the secondary iron core of shallow trench annular salient pole or have the mover portion of annular salient pole, all can adopt the planar annular salient pole portion that equates with the elementary iron core or the annular salient pole stator department teeth groove interface width of annular salient pole to substitute.
8. according to claim 1,2,3,4,5,6 described any single-degree-of-freedom magnetic suspension rotor support systems.It is characterized in that:, be subdivided into many according to original trend being positioned on the moving stator soft iron magnetic pole strength of magnetic suspension bearing air gap both sides.And guarantee that the teeth groove that is segmented on the magnetic pole strength air gap both sides is symmetrical.It also can be unified constriction to former moving, stator pole face.
9. according to the described single-degree-of-freedom magnetic suspension rotor of claim 1 support system.It is characterized in that: described attraction profile shaft is the pillar motor to magnetic suspension bearing.Described radial magnetic bearing is the double-flanged end disc-type electric motor that is composited by two single side type disc-type electric motors.The rotor portions of pillar motor and mover portion are separately positioned on the centre position of rotary body and rotary body supporting part.Two single side type disc-type electric motors are positioned on the two-end part of single-degree-of-freedom magnetic suspension rotor support system.And make the pillar motor have identical rotating speed with the single side type disc-type electric motor.
10. according to claim 1,2,3,4,5,6,7,8,9, described any single-degree-of-freedom magnetic suspension rotor support system.It is characterized in that: between the supporting part of rotary body and rotary body, also be provided with Mechanical Contact bearing (4,5 or 17,18 or 37).This Mechanical Contact bearing directly changes the mechanical protection bearing of single-degree-of-freedom magnetic suspension rotor support system into after break-in was lost efficacy.
11. according to claim 1,2,3,4,5,6,7,8,9 described any single-degree-of-freedom magnetic suspension rotor support systems.It is characterized in that: between rotary body and rotary body supporting part, also be provided with the air gap stopping means (12,13 or 56,57 or 29,30 or 35,36 or 44,45 or 53,54) of footpath axial magnetic suspension bearing.The air gap stopping means of this footpath axial magnetic suspension bearing is made up of the mover portion and the stator department shelves body that are separately positioned on rotary body and the rotary body supporting part, and makes the reference air gap of the gap of stator department shelves body setting less than the design of footpath axial magnetic suspension bearing.
12. according to claim 1,2,3,4,5,6,7,8,9 described any single-degree-of-freedom magnetic suspension rotor support systems.It is characterized in that: no matter be that level is used or the vertical single-degree-of-freedom magnetic suspension rotor support system of using, on the position of the downward one side of rotary body and the pairing rotary body of rotary body supporting part thereof, permanent magnetism single side type magnetic bias weight reducing device be set.This permanent magnetism single side type magnetic bias weight reducing device, by being arranged on the rotary body supporting part, and the annular salient pole permanent-magnet stator portion that has a peripheral magnetic Yoke be arranged on the rotary body, and the mover portion that has the annular salient pole permanent magnetism mover portion of peripheral magnetic Yoke or do not have a plane annular salient pole of permanent magnet forms.Also can be by not formed with the permanent-magnet stator portion of peripheral magnetic Yoke and the mover portion that do not have a plane annular salient pole of permanent magnet.That single side type magnetic bias weight reducing device relies on is moving, the stationary magnetic field between the stator department forms a monolateral pulling force that upwards attracts to rotary body, reduces or offset the gravity load of rotary body diameter axial magnetic suspension bearing.Single-degree-of-freedom magnetic suspension rotor support system for vertical use, if what use in system is double-flanged end permanent magnetic radial magnetic suspension bearing, also can adopt increase at the rotary body one side rotary body magnetic attraction of the permanent magnetic radial magnetic suspension bearing between the one side downwards relatively upwards, reach the purpose that reduces or offset rotary body gravity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910138020.4A CN101771308B (en) | 2009-04-26 | 2009-04-26 | A kind of magnetic suspension rotor support system and magnetic suspension bearing and magnetic bias weight reducing device |
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| CN200810189906.7 | 2008-12-31 | ||
| CN200910138020.4A CN101771308B (en) | 2009-04-26 | 2009-04-26 | A kind of magnetic suspension rotor support system and magnetic suspension bearing and magnetic bias weight reducing device |
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| CN101771308A true CN101771308A (en) | 2010-07-07 |
| CN101771308B CN101771308B (en) | 2015-12-16 |
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| CN200910138020.4A Expired - Fee Related CN101771308B (en) | 2009-04-26 | 2009-04-26 | A kind of magnetic suspension rotor support system and magnetic suspension bearing and magnetic bias weight reducing device |
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