The reactive power-based model reference adaptive controller (MRAC) is presented in this paper in detail to estimate rotor resistance online. This controller can maintain rotor flux orientation of bearingless induction motor (BIM) driven by indirect vector control. The instantaneous and steady state reactive power of the rotating part of the BIM are selected in the MRAC as reference model and adjustable model, which automatically protects the entire system from any effects of stator resistance. In addition, this proposed formation of MRAC is independent of the requirement for the estimation of any flux in the calculation process. Therefore, this scheme is not influenced by the integration, and the problems like saturation and drift can be ignored. At zero speed, this scheme will estimate the rotor resistance more accurately. A speed sensorless scheme can be proposed after adding flux estimators to the MRAC. The effectiveness of the proposed scheme has been verified in MATLAB/SIMULINK.
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