Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1992-11-02
1994-04-05
Voeliz, Emanuel T.
Electrical generator or motor structure
Dynamoelectric
Rotary
32420713, H02K 709, G01B 714
Patent
active
053008413
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. In this way, the current (or magnetomotive force, mmf) in each respective actuator is functionally related to the flux therethrough, independent of the currents (or mmf's) in adjacent actuators. Application of a digital PWM pole voltage waveform during normal bearing operation results in a ripple current waveform at the PWM switching frequency. The resulting change in stator pole current and pole voltage are measured, and the average differential inductance is determined therefrom. Then, with knowledge of the differential inductance and the average pole current, the effective air gap length, air gap velocity, and magnetic flux are determined according to the inherent magnetization characteristic of the magnetic bearing.
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.
Voeliz Emanuel T.
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