Magnetic bearing device, rotating system therewith and method of identification of the model of the main unit in a rotating system

摘要

Problem of the present invention is to enable elimination or reduction of a signal wire in a dedicated cable for a magnetic bearing device for supplied an electric power from a control device to a magnetic bearing main unit via the dedicated cable. A magnetic bearing device 100 according to the present invention has a magnetic bearing main unit 10 having an electromagnet 12M for magnetically levitating and rotatably supporting a magnetic rotating body 11 and functioning as a magnetic bearing, a control device 20 having a compensating circuit 25 for generating a control signal for controlling a levitation position of the magnetic rotating body 11, and an electricity supply line 30L for supplying an electric power from the control device 20 to the magnetic bearing main unit 10. The magnetic bearing main unit 10 has a modulation carrier circuit 22 for generating a modulated wave and a first alternating-current coupling section 23A for transmitting the generated modulated wave to the control device 20 by the alternating-current coupling with the electricity supply line 30L. The control device 20 has a second alternating-current coupling section 23B for separating the modulated wave alternating-current coupled from the electricity supply line 30L and a carrier wave demodulating circuit 24 for detecting the separated carrier signal wave.