Improved Sensor Fault-Tolerant Control Technique Applied to Three-Phase Induction Motor Drive

An improved fault-tolerant control (FTC) method using mathematical functions is applied to the induction motor drive (IMD) against current sensors and speed encoder failures, which occur when sensor disconnected or completely damaged. The IMD with two an controlled based on field-oriented (FOC) technique in regular operation. In this paper, FTC unit implemented FOC controller detect solve fault increase reliability of process. measured stator currents feedback signal are integrated into diagnosis algorithms create a function. Three operating defined sequence proposed for determining health status sensors. function performs isolation replaces faulty signals proper estimated signals; then, will operate corresponding sensorless mode. Simulations be performed verify accuracy under various faults.