Electricity: motive power systems – Positional servo systems – With compensating features
Patent
1988-12-19
1989-11-07
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
With compensating features
310 905, 104281, 104284, G05D 23275
Patent
active
048795003
ABSTRACT:
A controller for a magnetic bearing system which controls the magnetic attraction force acting between a rotor yoke rigidly secured to a rotary shaft and a pair of electromagnet stators rigidly secured to a casing on the basis of a signal output from a displacement sensor which measures relative displacement between the rotary shaft and the casing. The signal output from the displacement sensor is input to a compensation circuit. The signal output from the compensation circuit is input to both the non-inverting input terminal of one operational amplifier and the inverting input terminal of the other operational amplifier. An exciting coil bias voltage is input to the respective inverting input terminals of the two operational amplifiers.
REFERENCES:
patent: 4473259 (1984-09-01), Goldowaky
patent: 4652820 (1987-03-01), Maresca
"The Application of Active Magnetic Bearings to a Natural Gas Pipeline", ASME Paper 86-GT-61, E. G. Forster, P. Eng. et al.
"Effect of Control Algorithms on Magnetic Journal Bearing Properties", ASME Paper 86-GT-54, R. R. Humphris et al.
"The Active Magnetic Bearing Optimum Control of Machine Vibrations" ASME Paper 85-TG-221, Helmut Habermann et al.
Bergmann Saul M.
Ebara Corporation
Ebara Research Co. Ltd.
Shoop Jr. William M.
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