Ambient-temperature passive magnetic bearings: Theory and design equations
Research has been underway at the Lawrence Livermore National Laboratory to build a theoretical and experimental base for the design of ambient-temperature passive magnetic bearings for a variety of possible applications. in the approach taken the limitations imposed by Earnshaw`s theorem with respect to the stability of passive magnetic bearing systems employing axially symmetric permanent-magnet elements are overcome by employing special combinations of elements, as follows: Levitating and restoring forces are provided by combinations of permanent-magnet-excited elements chosen to provide positive stiffnesses (negative force derivatives) for selected displacements (i.e., those involving translations or angular displacement of the axis of rotation). As dictated by Eamshaw`s theorem, any bearing system thus constructed will be statically unstable for at least one of the remaining possible displacements. Stabilization against this displacement is accomplished by using periodic arrays (`Halbach arrays`) of permanent magnets to induce currents in close-packed inductively loaded circuits, thereby producing negative force derivatives stabilizing the system while in rotation. Disengaging mechanical elements stabilize the system when at rest and when below a low critical speed. The paper discusses theory and equations needed for the design of such systems.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE Office of Financial Management and Controller, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 302210
- Report Number(s):
- UCRL-JC-129214; CONF-980832-; ON: DE98057423; BR: YN0100000
- Resource Relation:
- Conference: 6. international symposium on magnetic bearings, Cambridge, MA (United States), 5-7 Aug 1998; Other Information: PBD: 30 Dec 1997
- Country of Publication:
- United States
- Language:
- English
Similar Records
Ambient-Temperature Passive Magnetic Bearings for Flywheel Energy Storage Systems
Stability Issues in Ambient-Temperature Passive Magnetic Bearing Systems