Magnetic bearing controller

Details Magnetic bearing controller Magnetic bearing controller

1997-02-25

1998-06-02

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 905, 318611, 318623, 318632, G05B 501

Patent

active

057605114

ABSTRACT:
A second circuit B which is composed of a band-pass filter circuit (5) which takes out a rotating body position signal input from a sensor (1) while scarcely varying a phase within a range including a normal rotation frequency and a reverse rotation frequency of a rotating body, a gain circuit (6) for controlling a gain of an output signal from the bandpass filter circuit (5) and a second notch filter circuit (7) for attenuating components having frequencies lower than the natural frequency of an output signal from a gain circuit (6) is disposed separately from a main circuit A, and an output signal from the second notch filter circuit (7) is positively fed back to the main circuit A through an adding circuit (8). This composition makes it possible to obtain a magnetic bearing which is capable of sufficiently attenuating a bending natural frequency of a high-speed rotating body and supporting this rotating body with high rigidity even when a normal rotation frequency and a reverse rotation frequency of the high-speed rotating body vary.

REFERENCES:
patent: 4795927 (1989-01-01), Morii et al.
patent: 5013987 (1991-05-01), Wakui
patent: 5157296 (1992-10-01), Trumper
patent: 5256952 (1993-10-01), Yoneyama et al.

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