Research Of Field-Weakening Control Strategy For Induction Motor

The induction motor is widely used in various fields due to its low cost, high reliability, easy to maintain and mature control technology, such as electric vehicles, railway electric traction, mining machinery, aerospace, etc. Induction motor is required to have a wide range of field-weakening speed regulating ability in above application. So the study on field-weakening control strategy of induction motor has practical significance. The main work of paper is as follows:1、The mathematical model of induction motor based on tow-phase stationary and synchronous rotating coordinate are established. The principle of induction motor vector control is analyzed.2、The principle of induction motor field-weakening control is analyzed and the existing several field-weakening control methods are studied.3、To improve the current tracking ability and the ability of the motor torque output, combining the voltage closed-loop field-weakening control strategy, two kinds of modified voltage closed-loop field-weakening control algorithm are given, which based on fuzzy PI control and the torque current component respectively. Their simulation models are established and the simulation results are given.4、Experimental platform of control system is set up based on the ADI semi-physical simulation system. The experiments of modified field-weakening control algorithms were carried out.The simulation and experimental results show that the modified field-weakening control algorithm can effectively improve the induction motor torque output ability and current tracking characteristic in the field-weakening area. It improves the speed response, the static and dynamic performance of the system.