Importance

Loading Importance Indicators...

Abstract

A controlled radial magnetic bearing device which has an X-axis electromagnet and a Y-axis electromagnet provided on the X-axis and Y-axis perpendicular to each other in a plane normal to the axis of a rotary shaft, X-axis and Y-axis position sensors for detecting any displacement of the rotary shaft from its reference position, and X-axis and Y-axis control circuits for feeding the outputs of said position sensors back to the electromagnets to control them. It further includes a speed detector for detecting the speed of the rotary shaft, and an X-axis correction circuit for having a band-pass filter for extracting a reverse precession frequency component from the output of the Y-axis position sensor, a circuit for changing the output of the filter according to the output of the speed detector and an adder for adding the output of the changing circuit to the output of the X-axis position sensor, the output leading in phase by 90 degrees with respect to the reverse precession frequency component, and a Y-axis correction circuit having substantially the same structure as the X-axis correction circuit for and having a circuit for reversing the phase of the output of the X-axis position sensor, thereby attenuating the outputs of the X-axis and Y-axis control circuits with respect to the reverse precession frequency component and effectively attenuating the precession of the rotary shaft.

Loading the Abstract Image...

First Claim