Abstract:
This paper presents the theory, design and simulation of a fuzzy logic based controller used for an indirect field oriented controlled three phase induction motor (IM). Field Oriented Control (FOC) theory is the base of special control method for induction motor drives. With this theory induction motors can be controlled like a separately excited dc motor. This method enables the control of field and torque of induction machine independently by manipulating the corresponding oriented quantities. Induction motor is modeled in synchronous reference frame in term of dq form. Three speed control techniques, Direct, Scalar and conventional PD are used to compare the performance of the control system with fuzzy logic controller. The models are carried out using MATLAB/SIMULINK. The simulation results demonstrate that the performance of the Indirect Field Oriented Control (IFOC) technique with fuzzy logic controller is better, especially with dynamic disturbances than that for other three types of control.
