A Current Sensor Fault-Tolerant Control Solution for Induction Motor Drive

This paper proposes a fault-tolerant control solution for the induction motor drive against total current sensor failures. An improved proposal based on the combination of the measured current signal and its delay signal is applied to diagnose the fault of the current sensors in various conditions. The state of the current sensors is determined by the diagnosis method during the operation of the induction motor. In normal conditions, measured current signals will be supplied to the field-oriented control loop for motor speed control. In contrast, the estimated current signals will be used to replace measured currents when the sensor fault state is determined. The performance of the fault-tolerant control solution will be verified through simulations under various changing load conditions in the Matlab/Simulink environment.