Magnetic bearing apparatus and rotating machine having such an a

Details Magnetic bearing apparatus and rotating machine having such an a Magnetic bearing apparatus and rotating machine having such an a

1994-05-17

1996-02-13

Cabeca, John W.

Electricity: motive power systems

Positional servo systems

With compensating features

318623, 310 905, 32420712, G05D 1300

Patent

active

054913969

ABSTRACT:
A magnetic bearing is provided with a simulating circuit for estimating a displacement of a rotor on the basis of a force which is exerted on the rotor. An output of the simulating circuit is compared with an actual displacement signal. A delay circuit and a subtracter are provided to subtract a run-out, which was estimated one period before the rotation of the rotor, from the displacement signal. A displacement signal from which the run-out component was eliminated is set to a new displacement signal. A signal which is obtained by adding an estimated run-out of one period before, namely, an output of the delay circuit to the run-out which was estimated by comparing the output of the simulating circuit with the new displacement signal is newly inputted to the delay circuit. Due to this, the run-out component is eliminated from the displacement signal of the magnetic bearing, the load on power amplifiers for driving the electromagnets is reduced, there is a surplus for a saturation which is caused in a high frequency band, the reliability of the control system is improved, and deterioration of positional accuracy due to the run-out is prevented.

REFERENCES:
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patent: 5256952 (1993-10-01), Yoneyama et al.
Hannes Bleuler; "Decentralized Control of Magnetic Rotor Bearing Systems", Swiss Fed. Inst of Tech (Dissertation), 1984.

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