Abstract

In this chapter, a method is studied to estimate the rotor resistance for indirect field-oriented control (IFOC) of induction motor drive. In model reference adaptive system (MRAS)-based sensorless speed estimation techniques, usually, the rotor speed estimation is achieved by assuming the rotor resistance to remain unchanged during the operation. However, in practice, the rotor resistance of the motor varies with time depending on the drive’s temperature. This variation in rotor resistance accounts for error in the estimation of the rotor speed of the sensorless MRAS scheme-based induction motor speed estimator. To minimize this error caused due to rotor resistance variation, a rotor resistance estimation method is provided. To verify the feasibility and accuracy of the given method, a three-phase induction motor is being used. From the simulation results obtained, it can be observed that the proposed method provides an accurate estimation of rotor resistance, and simultaneous rotor speed estimation is achieved with lesser effects of rotor resistance variation.

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