Patent ID: 6398524
Filing Date: 2002-06-04
Classification: F04D,F16C

Abstract:
A magnetic bearing controller comprising:an electromagnet for supporting a floating member in a floating state; sensors for sensing the floating position of the floating member; and a controller for supplying sensor signals and an exciting currents via cables to the sensors and electromagnets, respectively, in order to support the floating member at a predetermined floating position based on signals received from the sensors, wherein the controller comprises: a signal source for supplying an AC signal to the sensors; a pair of sensor drive circuits for supplying differential signals via cables connected to both ends of serially connected sensor elements; two reference resistances that form a bridge circuit with the two sensor elements connected to the sensor drive circuit; and a sensor circuit for detecting a differential voltage between a center point of the sensor elements and a center point of the reference resistances connected by the bridge circuit; whereby the cables are disposed with balanced condition and capacitance generated by the length of the cable is canceled.