Study on Observer-Based Fault Detection Method of Induction Motor Sensor

Current sensor is one of the key elements in the control system of induction motor. Whether the accurate measurement of variables reflecting motor operation status can be made will directly affect the control effect on motor system and therefore the timely, accurate detection of sensor fault is necessary. This paper brings forward an observer-based method of residual generation and fault detection on the basis of the mathematical model of the induction motor. Due to whether or not the nonlinear part satisfies the Lipschitz conditions not limiting the observer design, the application of such observer is expanded. Meanwhile, the contradiction between robust error and fault sensitivity is also settled. The correctness and effectiveness of such method are verified by experimental testing on the simulated fault which also casts light on the engineering practice.