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Primary Examiner: Skudy, R.
Assistant Examiner:
Attorney: Terry; Howard P.

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Title: Magnetic suspension apparatus

Abstract: A magnetic bearing assembly for levitating a movable member in either rotation or linear translation comprises a three-loop magnetic circuit in which permanent magnets establish a quiescent or fixed flux across four magnetic gaps arranged to provide restoring forces transverse to the direction of gap flux; the resulting inherent instability in the longitudinal direction is overcome by an electric feedback control system which supplies control currents in a pair of coils associated with the magnetic gaps for modulating the permanent magnetic flux therein and thereby provides stabilizing longitudinal magnetic forces. The configuration may be generalized by simple extension to a (2n + 1) loop magnetic circuit with (n + 1) coils.

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Inventors: Sabnis, Ajit V. (Phoenix, AZ, US)

Application Number: 433430
Filing Date: 1974-01-14
Publication_date: 1976-08-24
Assignee: Sperry Rand Corporation (New York, NY)
Primary Class(es): 310/90.5
Other Classes:
US Patent Ref:

3238788	Mar, 1966	Arthur	308/10.
3383141	May, 1968	De Bennetot	308/10.
3428371	Feb, 1969	Lyman	308/10.
3473852	Oct, 1969	Lyman	308/10.
3493275	Feb, 1970	Stone	308/10.
3650581	Mar, 1972	Boden	308/10.
3779618	Dec, 1973	Soglia	308/10.
3787100	Jan, 1974	Habermann	308/10.

Other Refs: Other References: P. A. Studer; "Magnetic Bearings for Spacecraft"; Jan. 1972; pp. 1-6; Goddard S.C.; Greenbelt, Md.