Abstract
Mainly, the low speed estimation of induction motor (IM) sensorless drive can be done through the MRAS methods effectively due to its simplicity in construction of model design. The most used structures are back emf, rotor flux (RF), reactive power (Q) and torque based. Although reactive power based MRAS operate well at low or near zero speeds, the modification in rotor flux based MRAS method makes more effective than Q-MRAS, it allows adequate at low and near zero speeds for IM drive using improved R-MRAS based estimator. Conventional PI and fuzzy logic controller (FLC) are used in both Q-MRAS and improved RF-MRAS to estimate speed of the IM drive. This paper shows that the performance of improved RF-MRAS with FLC gives better results over Q-MRAS with fuzzy controller in terms of estimated speed, torque, currents, rotor resistance, and stator resistance. These are evaluated through the MATLAB/Simulink software.
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