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Analysis of scalar and vector control based efficiency-optimized induction motors subjected to inverter and sensor faults

Process and manufacturing industries are using Field Oriented control (FOC) to drive the induction motor for desired performance. To perform FOC, rotor speed and stator current are sensed and fed back to the controller and the speed control of motor is achieved through an inverter connected either in stator or rotor circuit. Hence, the control system heavily depends on feedback signals and inverter. When sensor/inverter is undergone a fault, the stability of the control system is abundantly affected and reliability of system is reduced. The fault in speed and current sensors may be omission fault, gain fault, saturation fault and bias fault. This paper presents the effects of certain faults on inverter or sensor in induction motor drive under energy-optimal control. Both squirrel-cage and wound rotor induction motors are considered for this research. From the test results, drive performance (survival/failure) operating at scalar and vector control is summarized.