Scalar/Vector Sensorless Control Combination Solution for Induction Motor Drives at Whole Speed Range Operation

This paper presents a solution for induction motor sensorless drives, especially focused on low fundamental frequencies. The proposed strategy involves a combination of scalar and vector control techniques. Its performance is augmented with three different strategies that improve its behavior in the low frequencies range. Finally, the proposed strategies are verified via simulation and experimental tests, demonstrating the suitability of the solution.