A comparative study of various methods of IM´s rotor resistance estimation

Various MRAS-based estimation schemes of IM´s rotor resistance has been proposed. Three simple rotor resistance identification methods of an induction motor drive are presented and compared. Two of the three techniques namely, electromagnetic torque equation, and reactive power equations are based on the generalization of existing methods. Authors proposed the third method, namely, active power equation which is an improvement over the existing schemes. Although all three schemes estimate the rotor resistance effectively, the proposed technique is superior to others in providing faster estimation approach. The proposed method will be analyzed along with other previously proposed MRAS based methods, and the advantage and limitations of each will be discovered. Simulation and experimental results confirmed that the rotor resistance estimation by active power equation is much faster than the other mentioned methods.