A New Method of Rotation Speed Identification for Speed-sensorless Vector Control System

In AC speed-sensorless speed-regulation system,rotation speed of asynchronous motor can be identified by easily measured voltage and current of stator according to mathematical model of asynchronous motor. The paper analyzed several methods of rotation speed identification based on MRAS,and aiming at disadvantages of these methods such as their reference models included one integrating circuit and would be influenced by resistance change and moment inductance of stator,it put forward a new method of rotation speed identification. The reference model of this method avoids pure integral operation and doesn’t include resistance and moment inductance of stator, so the method has better robust in range of wide speed. Computer simulation result proved feasibility of the proposed method.