Abstract
This paper analysed the basic principle of speed sensorless vector control system. Based on speed and current closed loop vector control, combined with a simple and feasible current hysteresis control strategy, the whole speed sensorless system of asynchronous motor is simulated in MATLAB/Simulink. The method uses the Model Reference Adaptive System (MRAS). The observation and analysis of waveform shows that the system has good static performance and robustness. The control effects are also as similar as the vector control system which contains speed sensor.
Highlights
AC induction motors have a wide range of applications in the production and life
On the basis of vector control, build the motor simulation model, and the Model Reference Adaptive System (MRAS) based speed estimation method is applied to the model
On the basis of analyzing the mathematical model of threephase asynchronous motor, a simulation model of current hysteresis vector control system based on speed sensorless is established
Summary
AC induction motors have a wide range of applications in the production and life. Due to the limited reliability and high cost of the current speed sensors (Most of them are photoelectric encoders, resolver, etc.) in harsh environments, it is very important to study the control system of high performance speed sensorless[1,2]. The main methods having been used are direct calculation, Extended Kalman Filter (EKF), model reference adaptive method (MRAS), high frequency injection and intelligent control method[3,4]. By comparing these methods, MRAS is suitable for medium and high speed operation and is easier to implement in practical application[5]. By observing the simulation results, the motor speed control and speed identification performance have been analyzed
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