Device for compensating the gain of a servo-controlled circuit by negative current feedback
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United States of America Patent
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-
Dec 29, 1981
Grant Date -
N/A
app pub date -
Feb 15, 1979
filing date -
Feb 20, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a device for compensating the gain of a circuit servo-controlling the position of a rotor with the aid of at least one electromagnetic bearing provided with electromagnet windings, from signals delivered by at least one detector detecting the position of the rotor, the servo-control circuit ensuring the control of the supply of the windings in response to the signals delivered by the detectors and comprising an amplification circuit with which is associated a negative current feedback loop, said device further comprising supplementary electrical means for injecting at the input of the amplification circuit a signal depending on the variations in the airgap of the servo-controlled electromagnetic bearing, in a predetermined variation frequency zone. The invention is more particularly applicable to electronic circuits for controlling active electromagnetic bearings.
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