Sensorless control of Non-Ideal back-EMF Permanent Magnet Synchronous Motor Based on State Space Control and Sliding Mode Observer

Abstract

The permanent magnet synchronous motors are mechanically very robust and powerful, which makes it possible to achieve high speeds using these motors. The air gap in these motors is very small, so the effect of the armature reaction is significant and noticeable. This feature also makes it possible to control this machine in constant torque regions and to reduce the flux. For a synchronous permanent magnet motor, in some cases, the need to control the motor speed or the motor position is very important. The controller of these motors plays a very important and effective role in controlling the speed and motor position. It causes that the use of intelligent and adaptive controllers would be considered more. In this study, the state-space control method is used to identify the system conversion function and the controller with sliding mode observer is used to identify the disturbances of the system. Also, in the configuration of the system, a three-level converter of the voltage source is used to control and change the voltage and frequency. The output includes a designed constant voltage that in this way, the process of speed variation with a much higher dynamic response to a faster and better response than other control methods.