GB2425576A - Magnetic suspension structure - Google Patents

Magnetic suspension structure Download PDF

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Publication number
GB2425576A
GB2425576A GB0508375A GB0508375A GB2425576A GB 2425576 A GB2425576 A GB 2425576A GB 0508375 A GB0508375 A GB 0508375A GB 0508375 A GB0508375 A GB 0508375A GB 2425576 A GB2425576 A GB 2425576A
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GB
United Kingdom
Prior art keywords
magnetic
assemblies
magnetic field
suspension structure
magnetic suspension
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB0508375A
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GB0508375D0 (en
Inventor
Wei-Min Zhang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Z&D Ltd
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Z&D Ltd
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Publication date
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Priority to GB0508375A priority Critical patent/GB2425576A/en
Publication of GB0508375D0 publication Critical patent/GB0508375D0/en
Publication of GB2425576A publication Critical patent/GB2425576A/en
Withdrawn legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C39/00Relieving load on bearings
    • F16C39/06Relieving load on bearings using magnetic means
    • F16C39/063Permanent magnets
    • F16C39/066Permanent magnets with opposing permanent magnets repelling each other
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00Bearings not otherwise provided for
    • F16C32/04Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406Magnetic bearings
    • F16C32/0408Passive magnetic bearings
    • F16C32/0423Passive magnetic bearings with permanent magnets on both parts repelling each other
    • F16C32/0429Passive magnetic bearings with permanent magnets on both parts repelling each other for both radial and axial load, e.g. conical magnets
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02NELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N15/00Holding or levitation devices using magnetic attraction or repulsion, not otherwise provided for

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)

Abstract

A method for establishing a magnetic suspension comprises forming a first substantially axisymmetrical magnetic field distribution from a base assembly 120 which has a first magnetic flux generative means 121 and a magnetically conductive base member 122 and forming a second substantially axisymmetrical magnetic field distribution from a suspended assembly 130 having a second magnetic flux generating means 131, wherein the second magnetic field is arranged in a repulsive relationship with the first magnetic field. The two magnetic fields are kept axially aligned by a holding means 134 and a counter-force is applied to the repulsive relationship by a balancing arrangement to form a self stabilizing bearing. The counter-force may be an attractive force or it may be an extra-repulsive force to counter a load that is suspended from the structure.

Description

Magnetic Suspension Method and Structure
Technical Field of Invention
This invention relates to a magnetic suspension method and structure, more particularly, to a magnetic suspension method and structure, which can be easily combined into other mechanical or structural systems to provide required suspension effects.
Background of Invention
It is known that magnetic suspension is highly desirable in many applications. Such a suspension utilizes repulsive forces between permanent magnets and/or electromagnets for contact-free suspension, so that suspended parts can have movements with little friction and noise. However, due to the intrinsic instability of magnetic repulsive forces, it is difficult to achieve a stable and at the same time dynamic arrangement.
It is known that sophisticated control can be used to maintain a stable magnetic suspension, but such a system is expensive and difficult to incorporate into practical applications.
Summary of Invention
A first object of this invention is to provide a magnetic suspension method with improved dynamic stability.
According to one aspect of the invention, there is provided a method for establishing a magnetic suspension, comprising steps of: a) forming a first substantially axisymmetrical magnetic field distribution by a base assembly having first magnetic flux generating means and a magnetically conductive base member; b) forming a second substantially axisymmetrical magnetic field distribution by a suspended assembly having second magnetic flux generating means, which second field distribution is arranged in repulsive relationship with the first
magnetic field distribution;
c) keeping the two magnetic field distributions axially aligned by a holding arrangement between the two assemblies; and d) applying a counter-force by a balancing arrangement so as to form a self- stabilizing suspension.
WMZ-008.O A second object of this invention is to provide a magnetic suspension structure with improved dynamic stability.
According to another aspect of this invention, there is provided a magnetic suspension structure comprising: a base assembly having first magnetic flux generating means and a magnetically conductive base member for forming a first substantially axisymmetrical magnetic field distribution; and a suspended assembly having second magnetic flux generating means for forming a second substantially axisymmetrical magnetic field distribution which is arranged in repulsive relationship with the first magnetic field distribution; wherein a holding arrangement keeps the two flux generating members axially Jo aligned and a balancing arrangement applies a counter-force to form a self-stabilizing suspension.
Preferably, the suspended assembly has a magnetically conductive back member to further enhance the repulsive relationship between the two assemblies.
Also preferably, each substantially axisymmetrical magnetic field distribution has a central field concentration area and peripheral field concentration area, which helps to enhance the magnetic suspension. Such a field distribution can be formed by conical shaped complementary pole faces formed between the two assemblies to further enhance the field concentration and to produce beneficial centring effects.
Also preferably, said holding arrangement can be formed by a central shaft being fixed to one assembly and extending through a central opening of the other assembly.
Also preferably, said holding arrangement can be formed by anchor magnet means and corresponding pole pieces to keep the two assemblies axially aligned. The anchor magnet means can be arranged to produce an attractive force as the counter-force to balance the repulsive relationship between the two assemblies, or to produce an extra repulsive force to counter a load supported by the suspension structure.
Also preferably, self-adjusting means can be incorporated between the two assemblies to achieve a flexible suspension.
Also preferably, a registration mechanism by magnetic attraction arrangement can be made between the two assemblies to further enhance the axial alignment between the two assemblies.
Advantageously, two suspension structures by this invention can be connected along a common central axis, so that they can form mutual alignment arrangement and mutual balancing arrangement.
WMZ-008.O
Brief Description of Drawings
Further features, advantages and details of the invention are to be described with reference to preferred embodiments illustrated in the drawings, in which: Fig. I is a cross-sectional view of a magnetic suspension structure according to a first embodiment of the invention; Fig. 2 is a cross-sectional view of a magnetic suspension structure according to a second embodiment; Fig. 3 is a cross-sectional view of a magnetic suspension structure according to a third embodiment; Fig. 4 is a cross-section view of a magnetic suspension structure according to a fourth embodiment; Fig. 5 is a cross-section view of a magnetic suspension structure according to a fifth preferred embodiment; and Fig. 6 shows a different position of the fifth embodiment.
Detailed Description of Preferred Embodiments
In this application, the inventive concept is described as a magnetic suspension method and structure because the functional parts of the invention can be incorporated into different machines or systems for different functional requirements. For this reason, the same basic structure can be called different names in different applications, such as magnetic suspension, magnetic bearing, magnetic holding system, magnetic spring or magnetic levitation system, etc. Therefore, the term magnetic suspension should be interpreted as covering all these applications.
General Structure of the First Embodiment Fig. 1 shows a suspension structure 100 including a base assembly 120 and a suspended assembly 130, which is suitable to applications having wobbly and/or rotational movements.
The base assembly 120 has a ring magnet 121 with its North pole directing upwards, and a base member 122 with an inner pole face 124 and an outer pole face 123. The inner pole face 124 is fitted into the central hole of the ring magnet 121, keeping the magnet axially aligned with the base member, so as to achieve axisymmetrical field concentration between the magnet 121 and the pole faces 123 and 124. At the centre of the inner pole WMZ-008.O 124, there is a through hole fitted with a pin 125 made of magnetic material. The pin 125 has a sliding fit in the hole so it is always pulled upwards by the magnetic force. The sharp tip of the pin 125 is covered by a bearing cap 126, which is made of a low friction and nonmagnetic material, such as bearing plastics.
The suspended assembly 130 has a ring magnet 131 with its North pole directing downwards, and a back member 132 with an inner conical pole face 138 and an outer conical pole face 139. Again, this arrangement achieves axisymmetrical field concentration between the magnet 131 and the pole faces 138 and 139. In the central hole of the inner pole face 138, there is fitted a non-magnetic holding shaft 133, which is secured by a cap 136 with threaded engagement between them. Inside the hollow shaft 133, there is an anchor magnet 134, a pole tip 135 at the lower end and a spring 137 biasing the magnet 134 and pole tip 135 downwards. If pressed from below, the pole tip 135 and anchor magnet 134 can slide inside the shaft 133.
When the suspended assembly 130 is made to stand on the bearing cap 126, as shown in Fig. 1, the anchor magnet 134 via the pole tip 135 is pulled downwards by a magnetic attraction force, while the magnet 131 is pushed upwards by an evenly distributed magnetic repulsion force. Because of the strong attractive force between the sharp tip of the pin 125 and the sharp pole tip 135, both are magnetically saturated, it keeps the two assemblies precisely aligned in axial direction, therefore, a very stable balance is achieved and the two assemblies will have a one-point contact between them. Also, the generally concave conical pole face of the base magnet 121 and the complementary conical pole face of the suspended magnet 131 produce a further centring effect which is helpful to the suspension stability.
Under this condition, most of the suspended assembly's weight is supported by magnetic field so the friction at the contact point is very small. For this reason, the suspended assembly can have easy spinning, as shown by arrow sign R, or wobbling movements as shown by arrow sign W. Also, it should be noted that both the pin 125 and the anchor magnet 134 together with the pole tip 135 are freely moveable in axial direction, which allows self-adjustment for weight compensation. More particularly, when weight carried by the assembly 130 is increased, the suspended assembly will be forced downwards a certain distance so the repulsive force between the two magnets 121 and 131 will increase and the system will be balanced at a new position.
WMZ-008.O Due to its self-adjusting and self-stabilizing features, this suspension structure can be used for many applications requiring wobbling, rotating and vertical movements, such as a supporting structure for a globe, wobbling toys, a gyroscope or a vibration sensing system.
It is obvious that any of the three magnets 121, 131 and 134 can be replaced by or combined with electromagnets so the system can provide a dynamic suspension by adjusting electric currents to any of the electromagnets. This would also make it possible for the suspended assembly 130 to "dance" up and down under the influence of current changes in an electromagnet. Further, it is obvious that the two magnets 121 and 131 do not have to be in the ring shape, any generally shapes, such as polygons or an array of axisymmetrically arranged small magnets, would produce good results. The permanent magnets used in this structure can be any hard magnetic material, such as sintered hard ferrite, sintered NdFeB, bonded NdFeB, etc. Hard ferrite would be particularly suitable due to its low costs.
General Structure of the Second Embodiment Fig. 2 shows a magnetic suspension structure 200 including a base assembly 220 and a suspended assembly 230, which is designed for heavy load suspension.
In this embodiment, the basic working principles of base magnet 221, base member 223, suspended magnet 231 and back member 232 are the same as the corresponding parts in the first embodiment, the difference is mainly in the arrangement of an anchor magnet 234 which is connected to the suspended assembly by a shaft 236 passing through a sliding bearing in an inner pole 225, and a centring magnet 224 fitted to the lower surface of the base member 222. Because the anchor magnet 234 and the centring magnet 224 are arranged to have the same pole direction, the repulsive force between them would keep the suspended assembly 230 axially aligned with the base assembly 220.
This arrangement does not allow sideway movements of the suspended assembly 230, but it allows free rotation, shown by an arrow sign R, and axial movement within a limited range. It should be noted that both of the two pairs of repulsive magnets 221 against 231, and 224 against 234, produce upwards suspension forces, which is balanced by a load represented by the arrow sign L, which is considerably heavier than the suspended assembly 230 itself. The load L can also be hanged to the assembly 230 from below. Further, it is suitable to have rotating movement without having much sideway load on the bearing 226.
The conical shape of the anchor magnet 234 and the complementary shape of the inner pole 225 allows a gradual force change when the anchor magnet moves in axial direction, and the WMZ-008.O bearing surface 235 would prevent direct contact between the magnet 234 and the lower face of the inner pole 225.
General Structure of the Third Embodiment Fig. 3 shows a magnetic suspension structure 300 including a base assembly 320 and a suspended assembly 330, which is suitable to virtually contact-free high speed rotation.
In this embodiment, the working principles of base magnet 321, base member 322, suspended magnet 331, back member 332, anchor magnet 334 and its pole tip have similar structures as in the first embodiment, and they work in a similar way. New features include a holding disc 333 fitted to the lower surface of the suspended assembly 330, a number of small magnets 338 evenly fitted to the outer edge of the disc 333, corresponding to the outer pole ring 323 of the base member 322, and a non-magnetic central shaft 340 fitted to the suspended assembly 330 and extending through a central hole in the inner pole 324 of the base member 322. A sleeve bearing 325 is fitted in the central hole to prevent any physical contact between the shaft 340 and the inner pole 324. By fitting a number of small magnets 338, which are attracted towards the outer pole ring 323, they provide extra downward force to balance the repulsive force between the magnets 321 and 331, to keep them at a relatively small gap, and also provide good registration effect to prevent the suspended assembly 330 from moving sideways. It is also possible to use a complete ring magnet 338 for the same effects if a weaker permanent magnet material is used, such as a plastic or rubber bonded magnet. The central shaft 340 is used to connect to a rotary drive for rotating movement as shown by an arrow sign R. It is also possible to replace the anchor magnet 334 and the inner pole 324 by a small motor for direct driving between the two assemblies. In operation, once the assembly 330 starts high speed rotation, its gyroscopic effects would make its operation more stable, thus to achieve virtually contact-free rotation. The sleeve bearing 325 is a loose fit, which is useful mainly during the start-up or slow- down process.
The general configuration of this embodiment makes it suitable, for example, to support a rotating disc.
General Structure of the Fourth Embodiment Fig. 4 shows a suspension system 400 including two base assemblies 420 and 420', and a suspended assembly 430, which is formed basically by fitting two suspended assemblies 330 in the above third embodiment back to back. It is obvious that since the suspended assembly 430 is supported from both sides, it can be made into a very strong W?vtZ-008.O holding and bearing structure for carrying considerable weight (not shown), suitable to, for example, high-speed centrifugal applications.
General Structure of the Fifth Embodiment Fig. 5 shows a suspension system formed by using a pair of suspension structures, including two base assemblies 520 and 520' fixed back to back, and two suspended assemblies 530 and 530' connected by a central shaft 536. This system is particularly suitable to linear movements and impact protection.
As shown in Fig. 5, the system includes two identical pairs of assemblies 520/530 and 520'/530', only the pair at the left (520 and 530) is described. A base assembly 520 has to a ring magnet 521 fitted in an annular base 522. The base 522 has inner and outer pole rings coaxial with the ring magnet 521, so as to form an axisynimetrical distribution of magnetic field. The arrangement of the inner and outer pole rings produce high field density, therefore strong suspension force. A suspended assembly 530 has a ring magnet 531, which is identical to the ring magnet 521 but arranged in a repulsive relationship; and a back member 532 with corresponding inner and outer pole rings facing the corresponding pole rings of the base 522. Between the base 522 and the back member 532, their corresponding inner and outer pole rings have complementary conical pole faces, which would produce some centring effects when the two assemblies are brought close to each other.
Further, the suspended assembly 530 is fixed to the central shaft 536 formed by a non-magnetic hollow tube, which extends through a central hole in the base 522. The other end of the tube 536 is fixed to the second suspended assembly 530' after extending through the second base assembly 520'. That is to say, all the assemblies 520, 530, 520' and 530' are aligned by the same shaft 536 and the two pairs of repulsive magnets provide balance force to each other so the system stays at a neutral position as shown in Fig. 5. In application, these two pairs of assemblies can be fitted to the two ends of a linear drive (not shown) for suspending axial movements shown by an arrow sign A. At the backside of the base 522, there is fitted with a centring magnet 524, which produces a repulsive force onto a magnet 534b in the shaft 536. This repulsive force helps to keep the shaft 536 axially aligned with the base member 522. There are further magnets 534a and 534c fitted in the tube 536, which are separated from the magnet 534b by non- magnetic spacers, and the direction of their hatch pattern indicates that they are magnetized in a direction opposite to that of magnet 534b.
WMZ-008.O Fig. 6 shows the moving part formed by the two connected assemblies 530 and 530' is moved towards left-hand side, so the suspension force between the assemblies 520 and 530 is reduced due to the increased gap, while the suspension force between the assemblies 520' and 530' is increased due to the reduced gap. That is to say, the combined effects are a net force for returning the moving part to the right. At the same time, the inner magnet 534b has moved outside the centring magnet 524, so the force between them becomes an attraction force, while the force between the centring magnet 524 and the inner magnet 534c is repulsive force, both having the same effects of forcing the moving part towards right.
The effects of the centring magnet and the inner magnets at the other end are the same. That is to say, they enhance the forces to return the moving part to its neutral position shown in Fig. 5. In this way, the whole system can provide effective axial suspension and impact protection over a stroke shown by the arrow sign S, and at the same time the system has effective centring effects to reduce sideway loads on the central shaft. Obviously, this arrangement also allows free rotational movements, as shown by the arrow sign R in Fig. 5.
Industrial Applicability
It is not difficult to understand from the above description that the method and structure according to the present invention can be easily incorporated into different machines or structures according to application requirements. The embodiments disclosed above are only exemplary, which can be modified or combined in many different ways according to practical needs and structural limitations.

Claims (12)

  1. WMZ-008.O Claims 1. A method for establishing a magnetic suspension,
    comprising steps of: a) forming a first substantially axisymmetrical magnetic field distribution by a base assembly having first magnetic flux generating means and a magnetically conductive base member; b) forming a second substantially axisymmetrical magnetic field distribution by a suspended assembly having a second magnetic flux generating means, which second field is arranged repulsive relative to said first magnetic field; c) keeping said two magnetic field distributions axially aligned by a holding arrangement; and d) applying a counter-force onto said repulsive relationship by a balancing arrangement so as to form a self-stabilizing suspension.
  2. 2. A magnetic suspension structure, comprising: a base assembly having first magnetic flux generating means and a magnetically conductive base member for forming a first substantially axisymmetrical magnetic field distribution; and a suspended assembly having a second magnetic flux generating means for forming a second substantially axisymmetrical magnetic field distribution which is arranged in repulsive relationship with said first
    magnetic field distribution;
    wherein a holding arrangement is made for keeping the two magnetic field distributions axially aligned and a balancing arrangement is made to apply a counter-force onto said repulsive relationship so as to form a self-stabilizing suspension.
  3. 3. A magnetic suspension structure of claim 2, wherein said suspended assembly has a magnetically conductive back member.
  4. 4. A magnetic suspension structure of claim 2 or claim 3, wherein each said substantially axisymmetrical magnetic field distribution has a central field concentration
    area and a peripheral field concentration area.
    WMZ-008.O
  5. 5. A magnetic suspension structure of any of the preceding claims 2 to 4, wherein said field distribution is formed by conical shaped complementary pole faces formed between the two assemblies.
  6. 6. A magnetic suspension structure of any of the preceding claims 2 to 5, further comprising anchor magnet means fitted between the two assemblies for keeping the two assemblies axially aligned.
  7. 7. A magnetic suspension structure of claim 6, wherein said anchor magnet means is arranged to produce an attractive force between the two assemblies as the counter-force to balance said repulsive relationship.
  8. 8. A magnetic suspension structure of claim 6, wherein said anchor magnet means is arranged to produce an extra repulsive force to counter a load supported by the suspended assembly.
  9. 9. A magnetic suspension structure of any of the preceding claims 6 to 8, further comprising self-adjusting means incorporated into said anchor magnet means for adjusting axial distance between the two assemblies.
  10. 10. A magnetic suspension structure of any of the preceding claims 2 to 9, further comprising a registration mechanism by a magnetic attraction arrangement between the two assemblies to further enhance the axial alignment therebetween.
  11. 11. A magnetic suspension structure of any of the preceding claims 2 to 10, wherein said holding arrangement is formed by a shaft fixed to the centre of one of said assemblies, extending through a central opening in the other assembly.
  12. 12. A magnetic suspension system comprising two suspension structures according to any of the preceding claims 2 to 11, wherein said two structures are connected along a common central axis, so as to form mutual alignment and balancing arrangement between them.
GB0508375A 2005-04-26 2005-04-26 Magnetic suspension structure Withdrawn GB2425576A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0508375A GB2425576A (en) 2005-04-26 2005-04-26 Magnetic suspension structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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GB0508375D0 GB0508375D0 (en) 2005-06-01
GB2425576A true GB2425576A (en) 2006-11-01

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102135138A (en) * 2010-01-22 2011-07-27 米克罗内尔有限公司 Device with a stator and a rotor laid within the stator
CN103944456A (en) * 2014-04-14 2014-07-23 清华大学 Motor
US20150044938A1 (en) * 2013-08-12 2015-02-12 Joseph Chieffo Magnetic levitation device and method
US20150343318A1 (en) * 2014-05-29 2015-12-03 Owen S. G. Liang Spin axis controllable spinning top assembly
CN105790641A (en) * 2015-06-16 2016-07-20 肇庆市衡艺实业有限公司 Magnetic suspension device
WO2023095106A1 (en) * 2021-11-29 2023-06-01 Sas Jarvis Industries Magnetic bearing

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB987595A (en) * 1961-05-30 1965-03-31 Baermann Max Improvements in or relating to axial bearing assemblies using permanent magnet arrangements
GB1165233A (en) * 1967-02-09 1969-09-24 Gen Electric & English Elect Improvements in or relating to Magnetic Suspensions
GB1547700A (en) * 1976-03-31 1979-06-27 Siemens Ag Synthetic resin-bonded permanet magnets of pulverulent or particulate material
JPS5560719A (en) * 1978-10-27 1980-05-08 Toshiba Corp Magnetic bearing
AU5193100A (en) * 1999-08-24 2001-03-01 Emwest Products Pty Limited Magnetic repulsion bearings for electricity meters

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB987595A (en) * 1961-05-30 1965-03-31 Baermann Max Improvements in or relating to axial bearing assemblies using permanent magnet arrangements
GB1165233A (en) * 1967-02-09 1969-09-24 Gen Electric & English Elect Improvements in or relating to Magnetic Suspensions
GB1547700A (en) * 1976-03-31 1979-06-27 Siemens Ag Synthetic resin-bonded permanet magnets of pulverulent or particulate material
JPS5560719A (en) * 1978-10-27 1980-05-08 Toshiba Corp Magnetic bearing
AU5193100A (en) * 1999-08-24 2001-03-01 Emwest Products Pty Limited Magnetic repulsion bearings for electricity meters

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102135138A (en) * 2010-01-22 2011-07-27 米克罗内尔有限公司 Device with a stator and a rotor laid within the stator
EP2354557A1 (en) * 2010-01-22 2011-08-10 Micronel AG Device with a stator and a rotor laid within the stator
US20150044938A1 (en) * 2013-08-12 2015-02-12 Joseph Chieffo Magnetic levitation device and method
US9795894B2 (en) * 2013-08-12 2017-10-24 Joseph Chieffo Magnetic levitation device and method
CN103944456A (en) * 2014-04-14 2014-07-23 清华大学 Motor
CN103944456B (en) * 2014-04-14 2016-06-08 清华大学 Motor
US20150343318A1 (en) * 2014-05-29 2015-12-03 Owen S. G. Liang Spin axis controllable spinning top assembly
US10099151B2 (en) * 2014-05-29 2018-10-16 Owen S. G. Liang Spin axis controllable spinning top assembly
CN105790641A (en) * 2015-06-16 2016-07-20 肇庆市衡艺实业有限公司 Magnetic suspension device
WO2023095106A1 (en) * 2021-11-29 2023-06-01 Sas Jarvis Industries Magnetic bearing

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