Patent ID: 6472787
Filing Date: 2002-10-29
Classification: F16C,G05B

Abstract:
A control unit for magnetic bearing comprising:number-of-rotation sensing means for sensing a number of rotation of a rolling element supported by a magnetic bearing; sampling frequency decision means for varying a sampling frequency according to variation of the number of rotation sensed by said number-of-rotation sensing means; displacement sensing means for sensing a displacement of said rolling element and outputting a digital displacement signal based on a sensed displacement; control means for outputting a control signal for the positional control of said rolling element based on the digital displacement signal outputted from said displacement sensing means, said control means performing a predetermined digital filtering processing at the sampling frequency provided by said sampling frequency decision means thereby varying a cutoff frequency according to the sampling frequency, to output the control signal with a damped frequency band including a resonance frequency associated with a natural frequency varying with the number of rotation of said rolling element and a rotational vibration frequency; and electromagnet control means for controlling an electromagnet of the magnetic bearing based on the control signal outputted from said control means.