CN105156473B - A kind of twin coil radial spherical magnetic bearing - Google Patents
A kind of twin coil radial spherical magnetic bearing Download PDFInfo
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- CN105156473B CN105156473B CN201510562645.9A CN201510562645A CN105156473B CN 105156473 B CN105156473 B CN 105156473B CN 201510562645 A CN201510562645 A CN 201510562645A CN 105156473 B CN105156473 B CN 105156473B
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Abstract
A kind of twin coil radial spherical magnetic bearing, four stator cores, first coil, the second coil, sleeve, air gap and the rotor mainly placed by edge ± X-direction and ± Y-direction form.The present invention uses spherical surface magnetic axis bearing structure, and electromagnetic force suffered by shaft is made to pass through the centre of sphere always, and when the shaft centre of sphere is overlapped with barycenter, electromagnetic force is zero with respect to the torque that shaft generates, to eliminate interference of the radial twisting to being axially translatable.In addition, stator core uses specific pole shoe structure, keep the Distribution of Magnetic Field on circumference more uniform, the magnetizing coil of stator core uses two coil configuration, and two coil turns are different, and the few coil current of the number of turns is controllable, coil current more than the number of turns is constant, current-responsive rate is improved compared with single coil structure, controllable current uses differential form, further improves the control accuracy of magnetic bearing.
Description
Technical field
The present invention relates to a kind of non-contact radial magnetic bearing, especially a kind of spherical surface magnetic bearing with twin coil,
The contactless support that can be used as rotary part in small-sized spacecraft, especially suitable for magnetically levitated flywheel or magnetic levitation control moment top
The non-contact bearing of spiral shell.
Technical background
With the development of space technology, the spacecrafts such as satellite, space station are higher and higher for the required precision of gesture stability,
Tradition machinery momenttum wheel cannot be met the requirements.Magnetically levitated flywheel is supported using magnetic bearing, eliminates what mechanical bearing was brought
Abrasion, improves the precision and stability of control moment.
In existing magnetically levitated flywheel or magnetic suspension control torque gyroscope structure, two-freedom radial direction magnetic bearing is generally used.
Under conditions of meeting bearing capacity, when rotor is translatable, air gap at magnetic bearing magnetic pole is more uniform to be produced with respect to shaft
Raw torque.But when rotor deflects, the magnetic air gap between magnetic bearing stator and rotor is uneven, leads to the electricity in magnetic pole strength
Magnetic force is uneven, and to generate the torsional moment of relative rotor barycenter, i.e., translation control, which controls twisting, generates disturbance torque.In
Permanent magnet offset radial magnetic bearing described in state's patent No. 201010256248.6 and 200710065049.5 and
The radial direction magnetic bearing magnetic pole strength with pole shoe described in 201010226322.X is cylinder, when magnetic bearing deflects, stator and rotor
Between there are non-uniform gaps the load of flywheel torsion bearing is increased, to generate larger torsion negative moment to reduce
The control accuracy and control moment precision of flywheel rotor, and pole shoe angle is very small, and it is full to easy to produce iron core local area flux density
And phenomenon, and the circumferential uniformity of flux density can be influenced, and then lead to the reduction of control accuracy indirectly.
Invention content
The technology of the present invention solves the problems, such as：Overcome the deficiencies of the prior art and provide it is a kind of eliminate interference and have
There is the radial spherical magnetic bearing of twin coil.
Technical solution of the invention is：A kind of twin coil radial spherical magnetic bearing includes mainly：Edge ± X-direction and
Four stator cores (1), coil (2), sleeve (3), air gap (4) and the rotor (5) that ± Y-direction is placed.Wherein journal bearing line
Circle (2) is wound on two magnetic poles of each stator core (1), and the radially inner side of four stator cores (1) is rotor (5), fixed
Radial magnetic air gap (4) is formed between sub- iron core (1) and rotor (5), the radial outside of stator core (1) is sleeve (3), described
Each stator core (1) magnetic pole is pole shoe form, and the angle that front left edge is formed with right side edge is 83 °, circumferentially
The distance between upper two adjacent stator core (1) magnetic poles are 2mm, the left side edge of each stator core (1) magnetic pole front
It it is 126 ° with middle part junction angle, the right side edge of each stator core (1) magnetic pole front is with middle part junction angle
126 °, left side pole shoe thickness and the right side pole shoe thickness of stator core magnetic pole are 2mm, on the magnetic pole of each stator core (1)
The coil (2) wound includes the first magnetizing coil (2-1) and the second magnetizing coil (2-2), wherein the first magnetizing coil (2-1)
Close to air gap (4) side, for the second magnetizing coil (2-2) close to magnetic pole root, the first magnetizing coil (2-1) the number of turns is 20~50 circles,
It controls current adjustment, and the second magnetizing coil (2-2) the number of turns is 100~200 circles, and control electric current is constant, the first magnetizing coil
Radial clearance between (2-1) and the second magnetizing coil (2-2) is 1.5mm~2.8mm.The spherical diameter of the rotor (5)
19mm~49mm is taken, the centre of sphere angle corresponding to rotor (5) left spherical surface is 84 °, the left spherical surface upper edge of rotor (5) and rotor (5)
Arc edge tangent line angle is 132 ° on the upside of left spherical surface, the left spherical surface lower edge of rotor (5) and the left spherical surface downside of rotor (5)
Arc edge tangent line angle is 132 °, and the centre of sphere angle corresponding to rotor (5) right spherical surface is 84 °, on the upside of the right spherical surface of rotor (5)
Edge is 132 ° with arc edge tangent line angle on the upside of the right spherical surface of rotor (5), the right spherical surface lower edge of rotor (5) and rotor
(5) arc edge tangent line angle is 132 ° on the downside of right spherical surface.When needing radial load-bearing, two of upper stator core (1)
First coil the number of turns of magnetic pole is 30 circles, and the second coil turn is 160 circles, the First Line of two magnetic poles of lower stator core (1)
Circle the number of turns is 20 circles, and the second coil turn is 120 circles.
The stator core (1) and rotor (5) is the solid bulk of 1J50 magnetic conductions.
Described radial air gap (4) size is 0.5mm~0.7mm.
The principle of the present invention is：The magnetic pole strength structure of the stator core of the present invention uses spherical structure, makes electric suffered by shaft
Magnetic force passes through the centre of sphere always, and when the shaft centre of sphere is overlapped with barycenter, electromagnetic force is zero with respect to the torque that shaft generates, to eliminate
Interference of the radial twisting to being axially translatable.Stator core uses specific pole shoe structure, and making magnetic field along the circumferential direction has preferably
The uniformity, the phenomenon that local flux density will not be caused to be saturated, further improve the control accuracy of magnetic bearing.Stator core swashs
Magnetic coil uses two coil configuration, and two coil turns are different, and the few coil current of the number of turns is controllable, generates and adjusts magnetic field, the number of turns
More coil currents is constant, generates bias magnetic field, compared with single coil structure, since the number of turns of controllable coil is few, and inductance
It is small, it is greatly improved current-responsive rate, controllable current uses differential form.
Compared with existing scheme, major advantage is the solution of the present invention：(1) present invention is as a result of spherical surface magnetic pole,
Compared with the radial direction magnetic bearing of existing cylinder magnetic pole, interference of the radial twisting to being radially translatable is eliminated；(2) stator core uses
Specific pole shoe structure makes magnetic field have preferable even circumferential degree, can so that flux density is more uniform in magnetic pole, will not cause
The phenomenon that stator core part flux density saturation；(3) magnetizing coil uses two coil configuration, and two coil turns are different, and the number of turns is few
Coil current it is controllable, the coil current more than the number of turns is constant, and current-responsive rate, controllable electric are improved compared with single coil structure
Stream uses differential form, further improves the control accuracy of magnetic bearing.
Description of the drawings
Fig. 1 is a kind of sectional view of twin coil radial spherical magnetic bearing of the technology of the present invention solution；
Fig. 2 is the general assembly drawing of the technology of the present invention solution；
Fig. 3 is the stator core construction figure of the technology of the present invention solution；
Fig. 4 is the three-dimensional stator core construction figure of the technology of the present invention solution；
Fig. 5 is the three-dimensional stator core construction figure with twin coil of the technology of the present invention solution；
Fig. 6 is the rotor structure figure of the technology of the present invention solution.
Specific embodiment
As depicted in figs. 1 and 2, a kind of twin coil radial spherical magnetic bearing includes mainly：Edge ± X-direction and ± Y-direction are put
Four stator cores (1), coil (2), sleeve (3), air gap (4) and the rotor (5) set.Wherein journal bearing coil (2) coiling
In on two magnetic poles of each stator core (1), the radially inner side of four stator cores (1) is rotor (5), stator core (1)
Radial magnetic air gap (4) is formed between rotor (5), the radial outside of stator core (1) is sleeve (3), each stator core (1)
Magnetic pole on the coil (2) that is wound include the first magnetizing coil (2-1) and the second magnetizing coil (2-2), wherein first is excitatory
Close air gap (4) side of coil (2-1), the second magnetizing coil (2-2) are close to magnetic pole root, the first magnetizing coil (2-1) the number of turns
20~50 circles, preferably 28 circles control current adjustment, and the second magnetizing coil (2-2) the number of turns is 100~200 circles, preferably
180 circles, control electric current is constant, and the radial clearance between the first magnetizing coil (2-1) and the second magnetizing coil (2-2) is
1.5mm~2.8mm, preferably 1.96mm.Described radial air gap (4) size is 0.5mm~0.7mm, preferably 0.6mm.
When needing radial load-bearing, for example radial direction magnetic bearing is needed to provide gravity in the Y direction, then the stator in +Y direction
First coil the number of turns of two magnetic poles of iron core (1) is 30 circles, and the second coil turn is 160 circles, the stator core in -Y direction
(1) first coil the number of turns of two magnetic poles is 20 circles, and the second coil turn is 120 circles, and the purpose designed in this way is so that partially
It is of different sizes to set magnetic field so that the coil current in load-bearing direction, which is realized, to be minimized.
Fig. 3 is stator core field structure figure, and Fig. 4 is tomograph, and Fig. 5 is each magnetic pole of the stator with twin coil
Stator core field structure figure, described each stator core (1) magnetic pole are pole shoe form, front left edge and right edge
The angle that edge is formed is 83 °, and circumferentially upper adjacent the distance between two stator core (1) magnetic poles are 2mm (such as Fig. 2 institutes
Show), left side edge and the middle part junction angle of each stator core (1) magnetic pole front are 126 °, each stator core (1) magnetic
The right side edge of pole front and middle part junction angle are 126 °, and the left side pole shoe thickness and right side pole shoe of stator core magnetic pole are thick
Degree is 2mm.
The determination of all angles and thickness is the optimal corner angle value by largely emulating and testing, and can be made
Air-gap field fluctuation in a circumferential direction is minimum, peak-to-peak value can in 15mT hereinafter, and flux density in stator core (1) magnetic pole
Various pieces not will produce the saturation problem caused by " flux density concentration ", stator core (1) and rotor (5) be 1J50 or
The spherical diameter of 1J22 magnetic conduction bulk materials, stator core (1) takes 20mm~50mm, in the present invention the ball of stator core (1)
Face diameter takes 23mm, and edge ± X-direction and the appearance and size of each stator core of ± Y-direction placement are essentially equal, after installation
Each centre of sphere is completely superposed.
Fig. 6 is the rotor structure figure of the technology of the present invention solution, and the spherical diameter of rotor (5) takes 19mm~49mm,
The spherical diameter of rotor (5) takes 21.8mm in the present embodiment, and the centre of sphere angle corresponding to rotor (5) left spherical surface is 84 °, rotor (5)
Left spherical surface upper edge is 132 ° with arc edge tangent line angle on the upside of the left spherical surface of rotor (5), on the downside of the left spherical surface of rotor (5)
Edge is 132 ° with arc edge tangent line angle on the downside of the left spherical surface of rotor (5), the centre of sphere angle corresponding to rotor (5) right spherical surface
It it is 84 °, the right spherical surface upper edge of rotor (5) is 132 ° with arc edge tangent line angle on the upside of the right spherical surface of rotor (5), rotor
(5) right spherical surface lower edge and arc edge tangent line angle on the downside of the right spherical surface of rotor (5) are 132 °.
The content that description in the present invention is not described in detail belongs to the prior art well known to professional and technical personnel in the field.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (1)
1. a kind of twin coil radial spherical magnetic bearing, it is characterised in that：Include mainly：Edge ± X-direction and the four of the placement of ± Y-direction
A stator core (1), coil (2), sleeve (3), air gap (4) and rotor (5)；Wherein journal bearing coil (2) is wound in each
On two magnetic poles of stator core (1), the radially inner side of four stator cores (1) is rotor (5), stator core (1) and rotor
(5) radial magnetic air gap (4) is formed between, the radial outside of stator core (1) is sleeve (3), each stator core (1)
Magnetic pole is pole shoe form, and the angle that front left edge is formed with right side edge is 83 °, circumferentially upper two adjacent stators
The distance between iron core (1) magnetic pole is 2mm, left side edge and the middle part junction angle of each stator core (1) magnetic pole front
It it is 126 °, right side edge and the middle part junction angle of each stator core (1) magnetic pole front are 126 °, stator core magnetic pole
Left side pole shoe thickness is 2mm with right side pole shoe thickness, and the pole shoe structure that stator core uses can make air-gap field in circle
Fluctuation in circumferential direction is minimum, and peak-to-peak value can be in 15mT hereinafter, magnetic field is made with the preferable uniformity, will not along the circumferential direction to lead
The phenomenon that causing local flux density saturation, further improves the control accuracy of magnetic bearing；It is twined on the magnetic pole of each stator core (1)
Around coil (2) include the first magnetizing coil (2-1) and the second magnetizing coil (2-2), wherein the first magnetizing coil (2-1) is close
Air gap (4) side, for the second magnetizing coil (2-2) close to magnetic pole root, the first magnetizing coil (2-1) the number of turns is 28 circles, control electricity
Flow adjustable, the second magnetizing coil (2-2) the number of turns is 180 circles, and control electric current is constant, and the magnetizing coil of stator core uses two-wire
Coil structures, and two coil turns are different, the few coil current of the number of turns is controllable, generates and adjusts magnetic field, the coil current more than the number of turns is not
Become, generates bias magnetic field, since the number of turns of controllable coil is few, inductance is small, is greatly improved current-responsive rate, controllable electric
Stream uses differential form；Radial clearance between first magnetizing coil (2-1) and the second magnetizing coil (2-2) is 1.96mm, fixed
The spherical diameter of sub- iron core (1) takes 23mm, and edge ± X-direction and the appearance and size of each stator core of ± Y-direction placement are complete
Complete equal, each centre of sphere is completely superposed after installation；The spherical diameter of the rotor (5) takes 21.8mm, the left spherical surface institute of rotor (5)
Corresponding centre of sphere angle is 84 °, and the left spherical surface upper edge of rotor (5) is with arc edge tangent line institute on the upside of the left spherical surface of rotor (5) at folder
Angle is 132 °, and the left spherical surface lower edge of rotor (5) is 132 ° with arc edge tangent line angle on the downside of the left spherical surface of rotor (5),
Centre of sphere angle corresponding to rotor (5) right spherical surface is 84 °, the right spherical surface upper edge of rotor (5) and circular arc on the upside of the right spherical surface of rotor (5)
Edge tangent line angle is 132 °, the right spherical surface lower edge of rotor (5) and arc edge tangent line institute on the downside of the right spherical surface of rotor (5)
It it is 132 ° at angle；When needing radial load-bearing, first coil the number of turns of two magnetic poles of upper stator core (1) is 30 circles, the
Two coil the number of turns is 160 circles, and first coil the number of turns of two magnetic poles of lower stator core (1) is 20 circles, and the second coil turn is
120 circles, the purpose designed in this way are so that bias magnetic field is of different sizes so that the coil current in load-bearing direction, which is realized, to be minimized,
The stator core (1) and rotor (5) is the solid bulk of 1J50 magnetic conductions, and the radial air gap (4) size is 0.6mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510562645.9A CN105156473B (en) | 2015-09-07 | 2015-09-07 | A kind of twin coil radial spherical magnetic bearing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510562645.9A CN105156473B (en) | 2015-09-07 | 2015-09-07 | A kind of twin coil radial spherical magnetic bearing |
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| CN105156473A CN105156473A (en) | 2015-12-16 |
| CN105156473B true CN105156473B (en) | 2018-09-14 |
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| CN201510562645.9A Active CN105156473B (en) | 2015-09-07 | 2015-09-07 | A kind of twin coil radial spherical magnetic bearing |
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| CN107084195B (en) * | 2017-05-24 | 2019-04-12 | 北京石油化工学院 | A kind of prosecution is total to the pure electromagnetism magnetic bearing of position inner rotor radial spherical surface |
| CN110683080A (en) * | 2019-08-30 | 2020-01-14 | 北京航空航天大学 | Magnetic suspension ball bowl bearing device |
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Inventor after: Sun Jinji Inventor after: Ma Xin Inventor after: Liu Gang Inventor after: Tang Jiqiang Inventor after: Han Weitao Inventor before: Sun Jinji Inventor before: Liu Gang Inventor before: Tang Jiqiang Inventor before: Han Weitao |
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