Patent ID: 7737590

Claim:
A magnetic bearing device, comprising: a magnetic bearing main unit having an electromagnet for generating a magnetism for magnetically levitating and rotatably supporting a magnetic rotating body and for functioning as a magnetic bearing; a control device having a power supply for supplying an electric power to the magnetic bearing main unit and a control signal generation means for generating a control signal for controlling a levitation position of the magnetic rotating body by adjusting the magnetism; and an electricity supply line for supplying the electric power from the control device to the magnetic bearing main unit, wherein the magnetic bearing main unit has a carrier signal wave generation means for generating a carrier signal wave and a first alternating-current coupling section for alternating-current coupling the carrier signal wave generated by the carrier signal wave generation means with the electricity supply line for transmitting the carrier signal wave to the control device, and the control device has a second alternating-current coupling section for separating the carrier signal wave alternating-current coupled from the electricity supply line and a carrier signal wave detecting means for detecting the carrier signal wave separated by the second alternating-current coupling section.