Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Patent
1994-03-09
1996-02-27
Picard, Leo P.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
335306, 310 905, H01F 500, H01F 702, H02K 709
Patent
active
054952212
ABSTRACT:
A magnetic bearing system contains magnetic subsystems which act together to support a rotating element in a state of dynamic equilibrium. However, owing to the limitations imposed by Earnshaw's Theorem, the magnetic bearing systems to be described do not possess a stable equilibrium at zero rotational speed. Therefore, mechanical stabilizers are provided, in each case, to hold the suspended system in equilibrium until its speed has exceeded a low critical speed where dynamic effects take over, permitting the achievement of a stable equilibrium for the rotating object. A state of stable equilibrium is achieved above a critical speed by use of a collection of passive elements using permanent magnets to provide their magnetomotive excitation. The magnetic forces exerted by these elements, when taken together, levitate the rotating object in equilibrium against external forces, such as the force of gravity or forces arising from accelerations. At the same time, this equilibrium is made stable against displacements of the rotating object from its equilibrium position by using combinations of elements that possess force derivatives of such magnitudes and signs that they can satisfy the conditions required for a rotating body to be stably supported by a magnetic bearing system over a finite range of those displacements.
REFERENCES:
patent: 3107310 (1963-10-01), Carriere et al.
patent: 3146038 (1964-08-01), Lautzenhiser
patent: 3356425 (1967-12-01), Carriere et al.
patent: 3370896 (1968-02-01), Atkins
patent: 3434084 (1969-03-01), Milligan
patent: 3597023 (1971-08-01), Baermann
patent: 3784945 (1974-01-01), Baermann
patent: 3807813 (1974-04-01), Milligan
patent: 3860300 (1975-01-01), Lyman
patent: 3885504 (1975-05-01), Baermann
patent: 3885839 (1975-05-01), Habermann
patent: 3899223 (1975-08-01), Baermann
patent: 3909082 (1975-09-01), Ishikawa et al.
patent: 3954310 (1976-05-01), Rava
patent: 4037886 (1977-07-01), Boden
patent: 4077678 (1978-03-01), Studer et al.
patent: 4080012 (1978-03-01), Boden et al.
patent: 4167296 (1979-09-01), Dendy
patent: 4300807 (1981-11-01), Poupeau
patent: 4320927 (1982-03-01), Sertich
patent: 4340261 (1982-07-01), Wehde
patent: 4381875 (1983-05-01), Studer
patent: 4583752 (1986-04-01), Breitbach
patent: 4623202 (1986-11-01), Shingu
patent: 4988906 (1991-01-01), Littlefield
patent: 5010563 (1991-04-01), Laurent et al.
patent: 5218257 (1993-06-01), Tozoni
patent: 5256638 (1993-10-01), Weinberger
patent: 5330967 (1994-07-01), Takahata
Picard Leo P.
Ryan Stephen T.
Sartorio Henry P.
The Regents of the University of California
Wooldrige John P.
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