Electricity: motive power systems – Positional servo systems – 'reset' systems
Patent
1997-07-18
1999-10-26
Ip, Paul
Electricity: motive power systems
Positional servo systems
'reset' systems
318629, 318630, 318632, 310 905, H02K 709, F16C 3906
Patent
active
059734680
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.
REFERENCES:
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patent: 4885491 (1989-12-01), Hiyama et al.
patent: 5530306 (1996-06-01), Ueyama
patent: 5703424 (1997-12-01), Dorman
patent: 5736802 (1998-04-01), Ueyama et al.
patent: 5754425 (1998-05-01), Murakami
patent: 5760510 (1998-06-01), Nomura et al.
patent: 5760511 (1998-06-01), Nakagawa et al.
Ip Paul
Seiko Seiki Kabushiki Kaisha
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