Magnetic bearing apparatus

Details Magnetic bearing apparatus Magnetic bearing apparatus

2006-01-10

2006-01-10

Lam, Thanh (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

Reexamination Certificate

active

06984907

ABSTRACT:
A magnetic bearing apparatus has an electromagnet having a coil for levitating a rotatable member by a magnetic force and a control device to adjust a gain for levitation control of the rotatable member. The control device includes a displacement sensor to detect a levitated position of the rotatable member, a driver to supply a current to the electromagnet, and a phase compensator to adjust the current based on a signal from the displacement sensor. The control device also includes a band-pass filter into which an output signal of the phase compensator is inputted, an amplifier to amplify an output signal of the band-pass filter at a predetermined amplification ratio, and an adder to add an output signal of the amplifier to an output signal of the phase compensator and supply an added signal to the driver. The band-pass filter has a center frequency based on an actual rotation frequency of the rotatable member, a voltage, a current, or a frequency of a power source for a motor.

REFERENCES:
patent: 4686404 (1987-08-01), Nakazeki et al.
patent: 6657345 (2003-12-01), Shinozaki
patent: 2003/0038552 (2003-02-01), Setiawan et al.
patent: 5-332360 (1993-12-01), None
patent: 6-58332 (1994-03-01), None
patent: 2000-145774 (2000-05-01), None

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