Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1992-11-02
1994-04-05
Voeltz, Emanuel T.
Electrical generator or motor structure
Dynamoelectric
Rotary
32420713, H02K 709, G01B 714
Patent
active
053008421
ABSTRACT:
In an active magnetic bearing system employing radial or thrust bearings, rotor shaft position is determined without requiring air gap position sensors, resulting in a high reliability system. The flux paths for each respective electromagnetic force actuator of the active magnetic bearing are isolated in order to minimize the magnetic coupling therebetween. The active magnetic bearing system is controlled for mutually exclusive excitation of each of the two actuators (e.g., stator pole pairs) per control axis. A sequence of test voltage pulses is applied to the unexcited one of each actuator pole-pair. At the peak of an applied test voltage pulse, after a predetermined time interval, the pole flux linkage is estimated using either an analog or software integrator. The integrator is reset at zero current, and hence zero flux, thereby avoiding accumulation of errors. The effective air gap length is determined from the inherent magnetization characteristic of the magnetic bearing using the measured current and the estimated flux linkage. Effectively, each magnetic pole is used alternately for force actuation and for inductive feedback sensing, eliminating the need for separate position sensors.
REFERENCES:
patent: 4504098 (1985-03-01), Battarel et al.
patent: 4629262 (1986-12-01), Hamilton
patent: 4652820 (1987-03-01), Maresca
patent: 5003211 (1991-03-01), Groom
patent: 5036236 (1991-07-01), Wilson
patent: 5051637 (1991-09-01), Harris et al.
Lyons James P.
Preston Mark A.
Breedlove Jill M.
General Electric Company
Snyder Marvin
To E.
Voeltz Emanuel T.
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