CN101975224B - Magnetic suspension bearing of hybrid magnetic circuit - Google Patents
Magnetic suspension bearing of hybrid magnetic circuit Download PDFInfo
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- CN101975224B CN101975224B CN2010105250166A CN201010525016A CN101975224B CN 101975224 B CN101975224 B CN 101975224B CN 2010105250166 A CN2010105250166 A CN 2010105250166A CN 201010525016 A CN201010525016 A CN 201010525016A CN 101975224 B CN101975224 B CN 101975224B
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Abstract
The invention provides a magnetic suspension bearing of a hybrid magnetic circuit, which relates to the technical field of magnetic suspension bearings. The invention overcomes the defects of large electric power, large volume and heavy weight of the existing magnetic suspension bearing. Four stator teeth in a stator core in the magnetic suspension bearing of the hybrid magnetic circuit of the invention are uniformly distributed on the inner surface of an annular yoke in an angle of 90 degrees, and the width Wt of the stator teeth in the circumferential direction meets the following condition: Wt<pi Di/4, wherein Di represents the inner diameter of the stator core. A magnetism gathering yoke of a permanent magnet is arranged between the tooth ends of every two adjacent stator teeth facing an air gap, a parallel slot is formed on the bisector of the magnetism gathering yoke of the permanent magnet along the radial direction, a permanent magnet in a flat structure is embedded in the slot, and the permanent magnet is magnetized in parallel along the tangential direction. A rotor is cylindrical or tubular and is composed of a magnetism guiding ring and a rotating shaft, and the magnetism guiding ring is sleeved outside the cylindrical or tubular rotating shaft. The magnetic suspension bearing of the hybrid magnetic circuit of the invention has the advantages of low loss, low temperature rise, good control characteristic, small volume, light weight and wide application prospect.
Description
Technical field
The present invention relates to a kind of magnetic suspension bearing.
Background technique
Magnetic bearing is claimed Active Magnetic Suspending Bearing again, is the novel high-performance bearing that does not have Mechanical Contact between a kind of rotor and the stator.Compare with conventional ball bearings, sliding bearing and filmatic bearing; Magnetic suspension bearing utilizes the electromagnetic force effect that rotor is suspended in the space; There is not Mechanical Contact between the rotor; Rotor can reach very high running speed, has that mechanical wear is little, energy consumption is low, noise is little, the life-span is long, need not to lubricate, advantage such as no oil pollution, particular surroundingss such as particularly suitable high speed, vacuum, ultra-clean.Can be widely used in fields such as machining, turbomachinery, Aero-Space, petroleum and petrochemical industry, vacuum technique, the energy, the identification of rotor dynamics characteristic and test, be acknowledged as extremely promising novel bearing.
The basic structure of traditional magnetic suspension bearing is as shown in Figure 9, mainly is made up of stator and rotor, and stator comprises stator core and control coil; Control coil is on the tooth of stator core; It mainly is based on the working principle of electromagnet, utilizes the electromagnetic attraction between the rotor that rotor is suspended, and need in the stator control coil, feed bigger electric current for this reason; Thereby the electric power of Bearing Consumption is big, and the heating of coil is serious; As to realize that little electric current produces big suspending power, and must reduce the air gap between the rotor, this just needs to improve the operating accuracy of bearing.Simultaneously, the volume of this kind structure magnetic suspension bearing is big, weight is high.
Summary of the invention
In order to solve the defective that electric power is big, volume is big and weight is high of existing magnetic suspension bearing, the present invention proposes a kind of new hybrid magnetic circuit magnetic suspension bearing.
Mixing magnetic circuit magnetic suspension bearing of the present invention comprises stator, rotor and air gap; It is characterized in that stator is made up of stator core, field coil and excitation permanent magnet, the end face of stator core is a ring, in this stator sidewall, to have four end faces along the rotor motion direction be fan-shaped through hole; These four shape of through holes are identical; And the central shaft with stator is that axisymmetric distributes, and is stator tooth between two adjacent through holes, this stator tooth width W along the circumferential direction
tSatisfy condition: W
t＜π D
i/ 4, wherein, D
iBe frame bore, be wound with field coil on each stator tooth, the part between the tooth root of stator outer wall to stator tooth is a ring-shaped yoke; Four through holes of stator and the part between the air gap are gathered yoke for permanent magnet, have a groove in each neutral position of gathering yoke along mover moving direction, and this groove radially runs through said permanent magnet and gathers yoke; Each groove is embedded in one flat plate shape permanent magnet, this permanent magnet parallel magnetization, and magnetizing direction is along the tangential direction of stator circumference; The magnetizing direction of every adjacent two permanent magnets is opposite; Rotor is cylindrical or cylindrical shape, is made up of magnetic guiding loop and rotating shaft, and magnetic guiding loop is enclosed within outer surface cylindrical or the cylindrical shape rotating shaft.
The present invention also provides another kind of mixing magnetic circuit magnetic suspension bearing; It comprises stator, rotor and air gap; Stator comprises stator core, field coil and excitation permanent magnet; It is characterized in that the stator core inwall along the circumferential direction is evenly distributed with four stator tooths, each stator tooth width W along the circumferential direction
tSatisfy condition: W
t＜π D
i/ 4, wherein, D
iBe frame bore, be wound with field coil on each stator tooth; Between every adjacent two stator tooths is the groove of stator core, and the stator core that is positioned at the stator tooth root partly is conductive magnetic yoke, and the stator core between adjacent two stator tooths partly is that permanent magnet gathers yoke; It is mirror image that said permanent magnet gathers yoke; Each permanent magnet gathers on the madial wall of yoke, has the permanent magnet groove along its mirror symmetry planes, and this permanent magnet groove runs through said permanent magnet along mover moving direction and gathers yoke, has been embedded in one flat plate shape permanent magnet at each permanent magnet groove; Said permanent magnet parallel magnetization; Magnetizing direction is the tangential direction along circumference, and the magnetizing direction of adjacent two flat permanent magnet bodies is opposite, and rotor is cylindrical or cylindrical shape; Be made up of magnetic guiding loop and rotating shaft, magnetic guiding loop is enclosed within outside cylindrical or the cylindrical shape rotating shaft.
Mixing magnetic circuit magnetic suspension bearing of the present invention; Through high performance rare-earth permanent magnet 2 is used in the magnetic suspension bearing; In the magnetic circuit of bearing, produce the direct current flux biasing, can reduce the Number of ampere turns of electric excitation effectively, reduce volume, the weight of bearing; Reduce the loss and the temperature rise of bearing, improve the dynamic response and the control accuracy of bearing.
The loss and the temperature rise of mixing magnetic circuit magnetic suspension bearing of the present invention is low, control characteristic good, volume is little, in light weight, have broad application prospects.
Description of drawings
Fig. 1 is the radial section figure of embodiment one described magnetic suspension bearing among the present invention.Fig. 2 is the radial section figure of embodiment two described magnetic suspension bearings.Fig. 3 is the radial section figure of embodiment four described magnetic suspension bearings.Fig. 4 is the radial section figure of embodiment five described magnetic suspension bearings.Fig. 5 is the radial section figure of embodiment eight described magnetic suspension bearings.Fig. 6 is the radial section figure of embodiment nine described magnetic suspension bearings.Fig. 7 is the radial section figure of embodiment ten described magnetic suspension bearings.Fig. 8 is the A-A sectional drawing of Fig. 7.Fig. 9 is the radial section figure of the basic structure of traditional magnetic suspension bearing.
Embodiment
Embodiment one: the mixing magnetic circuit magnetic suspension bearing of this mode of execution is made up of stator, rotor and air gap; Stator is made up of stator core, field coil 5 and excitation permanent magnet 2, and the end face of stator core is a ring, in this stator sidewall, to have four end faces along the rotor motion direction be fan-shaped through hole 6; These four through hole 6 shapes are identical; And the central shaft with stator is that axisymmetric distributes, and is stator tooth 4 between two adjacent through holes 6, this stator tooth 4 width W along the circumferential direction
tSatisfy condition: W
t＜π D
i/ 4, wherein, D
iBe frame bore, be wound with field coil 5 on each stator tooth 4, the part between the tooth root of stator outer wall to stator tooth 4 is a ring-shaped yoke; Four through holes 6 of stator and the part between the air gap are gathered yoke 3 for permanent magnet; Have a groove in each neutral position of gathering yoke along mover moving direction, and this groove radially runs through said permanent magnet and gather yoke 3, each groove is embedded in one flat plate shape permanent magnet 2; These permanent magnet 2 parallel magnetizations; And magnetizing direction is along the tangential direction of stator circumference, and the magnetizing direction of every adjacent two permanent magnets 2 is opposite, and rotor is cylindrical or cylindrical shape; Be made up of magnetic guiding loop and rotating shaft, magnetic guiding loop is enclosed within outer surface cylindrical or the cylindrical shape rotating shaft.
Referring to Fig. 1, shown in Figure 1 is that rotor in this mode of execution is the radial section figure under the cylinder situation.
Embodiment two: this mode of execution is described referring to Fig. 2.This mode of execution is with the difference of mode of execution one, is provided with axial separated magnetic hole 7 in each stator tooth 4 and the joint that adjacent permanent magnet gathers yoke 3.
This mode of execution has increased separated magnetic hole 7 in the joint that permanent magnet gathers yoke 3 and stator tooth 4, can effectively reduce influencing each other between permanent magnet 2 magnetic fluxs and the electro-magnetic flux, improves the control accuracy of bearing.
Embodiment three: the mixing magnetic circuit magnetic suspension bearing of this mode of execution mainly is made up of stator, rotor and air gap; Stator comprises stator core, field coil 5 and excitation permanent magnet 2; The stator core inwall along the circumferential direction is evenly distributed with four stator tooths 4, each stator tooth 4 width W along the circumferential direction
tSatisfy condition: W
t＜π D
i/ 4, wherein, D
iBe frame bore, be wound with field coil 5 on each stator tooth 4; Between every adjacent two stator tooths 4 is the groove of stator core, and the stator core that is positioned at stator tooth 4 roots partly is conductive magnetic yoke 1, and the stator core between adjacent two stator tooths 4 partly is that permanent magnet gathers yoke 3; Said permanent magnet gathers yoke 3 and is mirror image; Each permanent magnet gathers on the madial wall of yoke 3, has the permanent magnet groove along its mirror symmetry planes, and this permanent magnet groove runs through said permanent magnet along mover moving direction and gathers yoke 3, has been embedded in one flat plate shape permanent magnet 2 at each permanent magnet groove; Said permanent magnet 2 parallel magnetizations; Magnetizing direction is the tangential direction along circumference, and the magnetizing direction of adjacent two flat permanent magnet bodies 2 is opposite, and rotor is cylindrical or cylindrical shape; Be made up of magnetic guiding loop and rotating shaft, magnetic guiding loop is enclosed within outside cylindrical or the cylindrical shape rotating shaft.
The difference of described magnetic suspension bearing of this mode of execution and embodiment one described magnetic suspension bearing is, it is different with the position of permanent magnet 2 that permanent magnet gathers yoke 3.
Embodiment four: this mode of execution is that with the difference of mode of execution three the end face outside of said stator is a square, and said foursquare four corner points lay respectively at four permanent magnets and gather in the mirror symmetry planes of yoke 3.
Referring to shown in Figure 3; The stator faces outside in this mode of execution is a square; Then conductive magnetic yoke 1 is positioned at 0 ° of circumferencial direction, 90 °, 180 °, 270 ° positions; Permanent magnet gathers yoke 3 and is positioned at 45 ° of circumferencial directions, 135 °, 225 °, 315 ° positions, and 4 stator tooths 4 are the internal surface that 90 ° of angles are distributed in conductive magnetic yoke 1.
Embodiment five: referring to shown in Figure 4.This mode of execution is with the difference of mode of execution three; The end face outside of said stator is by four straightways and four centrosymmetric images that arc section is formed; With the corresponding outside, conductive magnetic yoke 1 position be straightway, gathering the yoke 3 corresponding outsides with permanent magnet is arc section.
Embodiment six: referring to shown in Figure 5.This mode of execution is that with the difference of mode of execution three the end face outside of said stator is circular.
Embodiment seven: this mode of execution is that with mode of execution three, four, five, six or seven difference the inboard that said permanent magnet gathers yoke 3 radial cross sections is smooth arc.Referring to Fig. 3, shown in 4.
Embodiment eight: this mode of execution is that with mode of execution three, four, five, six or seven difference said permanent magnet gathers the inboard convexity of the oriented groove in centre of yoke 3.
Convexity described in this mode of execution is a radial symmetric structure.For example, its cross section can be for trapezoidal, and these two trapezoidal hypotenuses parallel respectively at the side of its adjacent stator tooth 4.Referring to shown in Figure 5.
Embodiment nine: this mode of execution is with the main difference of mode of execution three; All have two grooves that are parallel to each other on each stator tooth 4 along the tooth depth direction; Along connecting stator tooth 4, said field coil 5 is embedded in said two grooves this groove along mover moving direction.
Referring to shown in Figure 6, the stator tooth 4 in this mode of execution is along the tooth depth direction and axially have two parallel slots, is that stator tooth 4 forms three dentation structures, on the dentation structure in the middle of said field coil 5 is wrapped in, and embeds in two grooves.
Embodiment ten: this mode of execution is with the main difference of mode of execution three; Also embedded axial position control coil 8 on each stator tooth 4; This plane, control coil 8 place is vertical each other with plane, field coil 5 place, and this control coil 8 can produce along the magnetic flux of mover moving direction.
Said control coil 8 is embedded in stator tooth 4 methods, and the mode that can be employed in fluting in the stator tooth 4 embeds, and also can adopt stator tooth 4 is divided into the mirror image two parts symmetrical, sandwiches control coil 8 therebetween.
Below, referring to Fig. 7,8, the mode that the mode that is employed in fluting embedding in the stator tooth 4 is embedded control coil 8 specifies:
On stator, also have with axisymmetric four annular grooves of rotor; Each annular groove is formed by four sections grooves; First section centre that is positioned at stator tooth 4 ends vertically wherein, second section, the 3rd section lays respectively on two axial end faces of stator tooth 4, the 4th section centre that is positioned at the conductive magnetic yoke 1 corresponding with this stator tooth 4; The central axis of motor is positioned at this plane, annular groove place, and control coil 8 embeds in this annular groove.
Increased axial position control coil 8 in this mode of execution, can realize the rotor axial control of position, that is:, reached the axial position of control rotor through controlling the electric current in this coil.
Embodiment 11: the main difference of this mode of execution and mode of execution one to ten is, is positioned at the magnetic force that magnetic force that two permanent magnets 2 of upside are produced is produced greater than two permanent magnets 2 of downside.
Further define magnetic force that two permanent magnets 2 at upside are produced and the relation between the magnetic force that two permanent magnets 2 of downside are produced in this mode of execution; And then reach when mover and stator are static relatively, the magnetic force that stator produced can overcome the mover self gravitation, make mover can be suspended in the effect of stator center.
Concrete technological means can adopt: make the direction of magnetization length of two permanent magnets 2 being positioned at upside more than or equal to the direction of magnetization length of downside two permanent magnets 2; Or the diagonal length of upside two permanent magnets 2 is more than or equal to the diagonal length of downside two permanent magnets 2; Or the thickness of two permanent magnets 2 of upside is big and the thickness of two permanent magnets 2 of downside.
Claims (10)
1. a mixing magnetic circuit magnetic suspension bearing comprises stator, rotor and air gap, it is characterized in that stator is made up of stator core, field coil (5) and excitation permanent magnet (2); The end face of stator core is a ring; In this stator sidewall, to have four end faces along the rotor motion direction be fan-shaped through hole (6), this four through holes (6) shape is identical, and is that axisymmetric distributes with the central shaft of stator; Be stator tooth (4) between adjacent two through holes (6), this stator tooth (4) width W along the circumferential direction
tSatisfy condition: W
t＜π D
i/ 4, wherein, D
iBe frame bore, be wound with field coil (5) on each stator tooth (4), the part between the tooth root of stator outer wall to stator tooth (4) is a ring-shaped yoke; Four through holes (6) and the part between the air gap of stator are gathered yoke (3) for permanent magnet; Have a groove in each neutral position of gathering yoke along the rotor motion direction, and this groove radially runs through said permanent magnet and gather yoke (3), each groove is embedded in one flat plate shape permanent magnet (2); This permanent magnet (2) parallel magnetization; And magnetizing direction is along the tangential direction of stator circumference, and the magnetizing direction of every adjacent two permanent magnets (2) is opposite, and rotor is cylindrical or cylindrical shape; Be made up of magnetic guiding loop and rotating shaft, magnetic guiding loop is enclosed within outer surface cylindrical or the cylindrical shape rotating shaft.
2. a kind of mixing magnetic circuit magnetic suspension bearing according to claim 1 is characterized in that, the joint of gathering yoke (3) at each stator tooth (4) and adjacent permanent magnet is provided with axial separated magnetic hole (7).
3. mixing magnetic circuit magnetic suspension bearing; It comprises stator, rotor and air gap; Stator comprises stator core, field coil (5) and excitation permanent magnet (2); It is characterized in that the stator core inwall along the circumferential direction is evenly distributed with four stator tooths (4), each stator tooth (4) width W along the circumferential direction
tSatisfy condition: W
t＜π D
i/ 4, wherein, D
iBe frame bore, be wound with field coil (5) on each stator tooth (4); Between every adjacent two stator tooths (4) is the groove of stator core, and the stator core that is positioned at stator tooth (4) root partly is conductive magnetic yoke (1), and the stator core that is positioned between adjacent two stator tooths (4) partly is that permanent magnet gathers yoke (3); It is mirror image that said permanent magnet gathers yoke (3); Each permanent magnet gathers on the madial wall of yoke (3), has the permanent magnet groove along its mirror symmetry planes, and this permanent magnet groove runs through said permanent magnet along the rotor motion direction and gathers yoke (3), has been embedded in one flat plate shape permanent magnet (2) at each permanent magnet groove; Said permanent magnet (2) parallel magnetization; Magnetizing direction is the tangential direction along circumference, and the magnetizing direction of adjacent two flat permanent magnet bodies (2) is opposite, and rotor is cylindrical or cylindrical shape; Be made up of magnetic guiding loop and rotating shaft, magnetic guiding loop is enclosed within outside cylindrical or the cylindrical shape rotating shaft.
4. a kind of mixing magnetic circuit magnetic suspension bearing according to claim 3 is characterized in that, the end face outside of said stator is a square, and said foursquare four corner points lay respectively at four permanent magnets and gather in the mirror symmetry planes of yoke (3).
5. a kind of mixing magnetic circuit magnetic suspension bearing according to claim 3; It is characterized in that; The end face outside of said stator is by four straightways and four centrosymmetric images that arc section is formed; With the corresponding outside, conductive magnetic yoke (1) position be straightway, gathering the corresponding outside of yoke (3) with permanent magnet is arc section.
6. according to claim 3,4 or 5 described a kind of mixing magnetic circuit magnetic suspension bearings, it is characterized in that the inboard that said permanent magnet gathers yoke (3) radial cross section is smooth arc.
7. according to claim 3,4 or 5 described a kind of mixing magnetic circuit magnetic suspension bearings, it is characterized in that said permanent magnet gathers the inboard convexity of the oriented groove in centre of yoke (3).
8. a kind of mixing magnetic circuit magnetic suspension bearing according to claim 3; It is characterized in that; All have two grooves that are parallel to each other along the tooth depth direction on each stator tooth (4), this groove connects stator tooth (4) along the rotor motion direction, and said field coil (5) is embedded in said two grooves.
9. a kind of mixing magnetic circuit magnetic suspension bearing according to claim 3; It is characterized in that; Also embedded axial position control coil (8) on each stator tooth (4); Plane, this control coil (8) place is vertical each other with plane, field coil (5) place, and this control coil (8) can produce along the magnetic flux of rotor motion direction.
10. according to claim 1 or 3 described a kind of mixing magnetic circuit magnetic suspension bearings, it is characterized in that the magnetic force that magnetic force that two permanent magnets (2) of upside are produced is produced greater than two permanent magnets of downside (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105250166A CN101975224B (en) | 2010-10-29 | 2010-10-29 | Magnetic suspension bearing of hybrid magnetic circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105250166A CN101975224B (en) | 2010-10-29 | 2010-10-29 | Magnetic suspension bearing of hybrid magnetic circuit |
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| Publication Number | Publication Date |
|---|---|
| CN101975224A CN101975224A (en) | 2011-02-16 |
| CN101975224B true CN101975224B (en) | 2012-08-08 |
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|---|---|---|---|
| CN2010105250166A Active CN101975224B (en) | 2010-10-29 | 2010-10-29 | Magnetic suspension bearing of hybrid magnetic circuit |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925292B (en) * | 2014-03-25 | 2016-06-29 | 中国人民解放军海军工程大学 | A kind of permanent magnetic offset mixed radial magnetic bearing |
| CN106337876B (en) * | 2016-10-13 | 2018-10-16 | 中国人民解放军海军工程大学 | Heteropolar formula permanent magnetic offset mixed radial magnetic bearing |
| CN111102293A (en) * | 2020-01-18 | 2020-05-05 | 湖南大学 | Active and passive magnetic-gas hybrid bearing |
| CN111853049B (en) * | 2020-06-15 | 2022-06-21 | 江苏大学 | Multi-angle adjustment and dead many connecting rods connecting device of lock |
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|---|---|---|---|---|
| EP0720272A1 (en) * | 1994-12-26 | 1996-07-03 | Alcatel Cit | Rotating device having an axial magnetical thrust bearing and radial levitating means |
| DE202004020504U1 (en) * | 2004-03-31 | 2005-08-04 | Drägerwerk AG | Magnetic bearing system comprises two radial bearings consisting of rotor suspended between two electromagnets, magnetic field sensors mounted on either side of stators between electromagnets being used to measure position of rotor |
| CN2847514Y (en) * | 2005-04-18 | 2006-12-13 | 吉林永大集团有限公司 | Permanent magnet mechanism with adjustable sucking surface air slot |
| CN2867573Y (en) * | 2005-04-22 | 2007-02-07 | 吉林永大集团有限公司 | Low-voltage contactor single-suction permanent magnet mechanism |
| CN101056035A (en) * | 2007-02-12 | 2007-10-17 | 南京航空航天大学 | Single coil multi-phase magnetic suspension motor |
| CN101710809A (en) * | 2009-12-16 | 2010-05-19 | 南京航空航天大学 | Single-phase bearingless switched reluctance motor |
-
2010
- 2010-10-29 CN CN2010105250166A patent/CN101975224B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0720272A1 (en) * | 1994-12-26 | 1996-07-03 | Alcatel Cit | Rotating device having an axial magnetical thrust bearing and radial levitating means |
| DE202004020504U1 (en) * | 2004-03-31 | 2005-08-04 | Drägerwerk AG | Magnetic bearing system comprises two radial bearings consisting of rotor suspended between two electromagnets, magnetic field sensors mounted on either side of stators between electromagnets being used to measure position of rotor |
| CN2847514Y (en) * | 2005-04-18 | 2006-12-13 | 吉林永大集团有限公司 | Permanent magnet mechanism with adjustable sucking surface air slot |
| CN2867573Y (en) * | 2005-04-22 | 2007-02-07 | 吉林永大集团有限公司 | Low-voltage contactor single-suction permanent magnet mechanism |
| CN101056035A (en) * | 2007-02-12 | 2007-10-17 | 南京航空航天大学 | Single coil multi-phase magnetic suspension motor |
| CN101710809A (en) * | 2009-12-16 | 2010-05-19 | 南京航空航天大学 | Single-phase bearingless switched reluctance motor |
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| CN101975224A (en) | 2011-02-16 |
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