Chaos detection in velocity control of induction motor and its control by using neural network

This paper is concerned with the occurrence of chaotic motion and its chaos control in the velocity control system of an induction motor. The induction motor is currently used by realization of the so-called vector control method, which is superior to a DC motor in maintenance. But, the stability of the velocity control system is not established, neither is its robustness. The dynamics of the induction motor is represented by nonlinear equations with three inputs and three outputs. Though precise parameters are necessary for the vector control method, there are often identified errors in parameters. Then, it is known that chaotic motions may occur in the system due to the effect of nonlinear terms. In this paper, the existence of chaotic motion in the velocity control system can be verified, and the generating conditions of chaotic motion are found. In order to prevent chaos occurrence, a chaos control method is proposed by using the neural network controller.