Design and development of closed loop model of an adjustable speed Permanent Magnet Synchronous Motor drive using PI controller

Abstract

This paper deals with the development of closed loop model of an adjustable speed Permanent Magnet Synchronous Motor (PMSM) drive fed from a voltage source inverter operating under 180° conduction mode, self synchronized with the rotor position information is represented. An automated closed loop adjustable speed PMSM drive can be achieved by employing a speed controller, to which the information about the reference speed and actual speed should be available. The incorporation of Sinusoidal Pulse Width Modulation (SPWM) strategy establishes near sinusoidal armature phase currents and comparatively less torque ripples without sacrificing torque/weight ratio. In this closed loop model of PMSM drive, the information about reference speed is provided to a speed controller, to ensure that actual drive speed tracks the reference speed with ideally zero steady state speed error. Design of the speed controller and current controller will be incorporated in order to achieve the desired performance of the closed loop model of PMSM drive accordingly. Therefore classical PI controller is chosen for such a closed loop adjustable speed PMSM drive for the performance optimization.