Rotor flux estimation method of bearingless induction motor based on stator current vector orientation

The key problem of rotor flux orientation control of bearingless induction motor is the estimation of rotor flux. Aiming at the problem that the estimation precision of rotor flux based on traditional flux estimator is influenced by the variation of stator or rotor resistance, a new estimation method based on the stator current vector orientation is proposed, which contains neither stator resistance nor rotor resistance, and the influence of stator and rotor resistance on estimation precision of rotor flux can be overcome. Matlab/Simulink simulation results have verified the validity of the presented estimator.