Magnetic bearing control at critical shaft speeds

Details Magnetic bearing control at critical shaft speeds Magnetic bearing control at critical shaft speeds

1990-12-26

1992-04-21

Shoop, Jr., William M.

Electricity: motive power systems

Motor structure adjustment or control

Rotor element movable axially

318611, H02K 100

Patent

active

051071924

ABSTRACT:
In a magnetic bearing system, the longitudinal shaft position is shifted relative to the bearing position so that a force can be applied by the bearings away from a node at critical shaft speeds. In one embodiment, the shaft is shifted by end thrust bearings back and forth on an integral cycle basis. Alternatively, closely-spaced bearing pairs may be used and energized alternately on an integral cycle basis in order to shift back-and-forth the region at which the combined effective force of the bearing is applied.

REFERENCES:
patent: 2399329 (1946-04-01), Beauregard
patent: 4219767 (1980-08-01), Wimmer
patent: 4421207 (1983-12-01), Falconer
patent: 4446412 (1984-05-01), Friedman et al.
patent: 4473259 (1984-09-01), Goldowsky
patent: 4950966 (1990-08-01), Moulds, III
patent: 5012170 (1991-04-01), Atlas

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