Velocity-controlled magnetic bearings

Details Velocity-controlled magnetic bearings Velocity-controlled magnetic bearings

1994-07-20

1997-09-09

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 68R, 318615, H02K 709

Patent

active

056660146

ABSTRACT:
The invention is an actively controlled radial magnetic bearing using inexpensive and rugged search coils as sensors instead of costly and delicate displacement or position sensors. It involves a feedback control scheme totally different from the conventional PID control algorithm. It comprises a velocity estimator with search coil signals as input, a velocity feedback controller with high-frequency gain and phase modification for the purpose of controlling flexible rotors, a self-starter automating the levitation, and a unique design and tuning method of analysis.

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