Abstract
In the research domain of the electrical drive with high and ultra high speed, bearingles smotor is a new type of magnetic suspension motor combining the driving and self-suspension, which can not only produce the torque for load driving, but also produce the magnetic levitation force for realizing no mechanical friction rotation.This dissertation focuses mainly on the theory and realization of induction-type and permanent magnet-type bearingless motor, including analytical expression of the magnetic levitation force, flux field oriented vector controllers, the feedback control of the levitation force, the design principle and consideration of the permanent magnet-type bearingless motora relatively accurate analytical expressions of the magnetic levitation force for the induction-type and permanent magnet-type bearingless motor is proposed in the dissertation with the eccentricity in the location of stator and rotor taking into consideration, and their computation accuracy was verified by ANSOFT, an electro-magnetic field analysis software of electrical machines
