Patent ID: 9388854
Filing Date: 2016-07-12
CPC Classification: F16C

Claim Text:
1. A magnetic bearing apparatus for supporting a rotational shaft, the magnetic bearing apparatus comprising: a magnetic bearing for supporting the rotational shaft in a contactless fashion through magnetic levitation by using an electromagnetic force which is generated by an electric current flown to an electromagnet; a rotation sensor for detecting the rotation of the rotational shaft; a controller for controlling the electric current flown to the electromagnet; and at least one vibration sensor which is provided within an influential range of vibration which is generated by the rotation of the rotational shaft, wherein the controller controls the electric current flown to the electromagnet as follows: in a first control mode, a first electric current is flown to the electromagnet for levitating and supporting the rotational shaft; and in a second control mode, a second electric current is flown to the electromagnet in place of the first electric current at a first periodic timing which is detected by the rotation sensor so that vibration is reduced to a lower level than a first vibration value detected in the first control mode in at least one of setting location of the at least one vibration sensor.