Research on the Beat Vibration of Active Magnetic Bearings

Beat vibration is a kind of special vibration which sometimes arise in the active magnetic bearing. This vibration can smear the quality of magnetic bearings seriously. Based on the analysis of the synthesis mechanism of the beat vibration, this paper investigated the origin of the beat vibration in the magnetic bearing. According to the special electrical and machinery structure of the magnetic bearing, the source and the formation of the two sub-vibrations (the vibration with the same frequency of the rotate speed of the rotor and the vibration with the same frequency of the rotating magnetic field in induction motor) which synthesize the beat vibration were analyzed. Finally, method of inhibition of the beat vibration is given.