Control system for a magnetic type bearing

Electrical generator or motor structure – Dynamoelectric – Rotary

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324208, F16C 3900

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active

047959274

ABSTRACT:
A control system for a magnetic type bearing is fed back a signal from a position sensor with respect to a floating member to effect control such as phase compensation so that the magnetic type bearing is actively employed. In order to change unstabilizing force produced by the magnetic type bearing in a specified frequency range to stabilizing force, a first signal obtained by causing the signal from the position sensor to pass through a first filter having a cut-off frequency range corresponding to a predetermined frequency range in which stabilization is to be attained and a second signal obtained by causing a signal having an opposite polarity to that of the signal from the position sensor to pass through a second filter having a passing frequency range which is substantially identical with the predetermined frequency range are added to each other and the addition signal is fed back to an electromagnet.

REFERENCES:
patent: 4686404 (1987-08-01), Nakazeki
"Electromagnetic Suspension and Levitation", Jayawant et al., IEEE Proc., vol. 129, Nov. 1982, pp. 549-550 and pp. 570-571.
"An Active Magnetic Bearing System", Habermann, et al., Tribology International Apr. 1980, pp. 85-89.
"Practical Magnetic Bearings", Habermann et al., IEEE Spectrum, Sep. 1979, pp. 26-30.
"On the Study of High-Frequency Self-Excited Oscillation in Flexible Rotor System with Active Magnetic Bearing", S. Morii et al., SICE '87 Jul. 15-17, Hiroshima, Japan pp. 1139-1142.

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