Sensorless Control of PMSM Using Sliding Mode Technique

Abstract

This paper proposes a sensorless control method for a surface-mounted Permanent-Magnet Synchronous Machine (PMSM) based on the stator parameters. The toque of the motor is indirectly controlled based on the stator voltage measurements and current measurements and also on knowledge of stator inductance and stator resistance. The rotor speed is also indirectly calculated and used for sensorless speed control. The use of sliding control (smc) technique method provides a straight forward solution for the control input. It is a dynamic control scheme which minimises error by comparing input and output values. It is a robust control scheme based on the concept of changing the structure of the controller in response to changing the state of   the system in order to obtain desired output. Experimental results confirm good dynamical performance, even at low speeds.