Magnetic bearing devices
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Oct 26, 1999
Grant Date -
N/A
app pub date -
Jul 18, 1997
filing date -
Jul 18, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
To provide magnetic bearing devices capable of preventing undesirable consequences caused by conical mode or parallel mode resonance which is liable to occur during acceleration of a rotor. A band-pass filter 24 is connected in series with a PID control circuit 12 is for improving stiffness in a specific frequency band. A displacement of a rotor 2 detected by a displacement detector 30 is entered to a switcher 32. On the other hand, a rotational speed sensor 7 detects the revolving speed, and a compensator switching discriminator 26 causes a switch 32s of the switcher 32 to connect to an output terminal 32b or to an output terminal 32c when the revolving speed coincides with preset revolving speed data. The preset revolving speed data defines specific revolving speeds occurring below and above a frequency band which includes a first conical mode resonant frequency and a second conical mode resonant frequency. The position of the rotor 2 is adjusted by a magnetic bearing 38 based on an output of the PID control circuit 12.
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