Electricity: motive power systems – Positional servo systems – Frequency- or phase-modulated systems
Patent
1986-05-08
1987-09-29
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Frequency- or phase-modulated systems
318625, 310 905, G05B 102
Patent
active
046971289
ABSTRACT:
The present invention reduces the resonance amplitude of the rotational frequency-synchronous unbalance vibration of a rotor supported by an electromagnetic bearing.
To this end, the invention disposes an X-direction control servo circuit and a Y-direction control servo circuit each of which detects the deviation of the rotor from a desired position in the radial direction thereof and controls the rotor so as to be held at the desired position on the basis of the detection signal, and a tracking filter which is synchronous with the rotational frequency. Outputs from the filter are crossed to supply the Y-direction control servo circuit with the X-directional output and to supply the X-direction control servo circuit with the Y-directional output signal.
REFERENCES:
patent: 4128795 (1978-12-01), Habermann et al.
Matsushita Osami
Sugaya Toyomi
Takagi Michiyuki
Yoneyama Mitsuho
Bergmann Saul M.
Hitachi , Ltd.
Shoop Jr. William M.
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