Ac Motor Speed Sensorless Vector Control System

Because of advances in solid state power devices and microprocessors, variable speed AC motors based on the advanced control principles are becoming more and more popular, as a result much higher efficiency and performance are achieved by these motors. In the paper, various control strategies of sensorless vector control of induction motors are analyzed. A platform including current loop and velocity loop is designed by using control chip TMS320F243 of TI company and power module PM25RSB120 of Mitsubshi company. It is a basic AC speed regulation system in search radar. A direct method using Powerlib in MATLAB is to simulate the method of sensorless vector control. Theory and how to undertake the EMC design are introduced.