Patent ID: 6184640
Filing Date: 2001-02-06
Classification: F04D,F16C,H02H,H02P

Abstract:
A magnetic bearing device comprising: a DC brushless motor comprised of a rotor having a permanent magnet and a rotary shaft, a stator coil for generating a magnetic field to rotate the rotor and disposed opposite to and spaced-apart from the permanent magnet, and a sensor for detecting a change in a polarity of the permanent magnet, the sensor being disposed between the rotor and the stator coil and in a non-contact state with the permanent magnet; drive control means for controlling the rotation of the rotor of the DC brushless motor; and a magnetic bearing having an electromagnet for magnetically supporting the rotary shaft of the DC brushless motor and for controlling a magnetic force of the electromagnet to support the rotary shaft at a preselected position.