Real time implementation of high performance closed loop embedded control system for interior permanent magnet motors

Abstract

Aiming at achieving a low cost and precise closed loop speed control of interior permanent magnet synchronous motor (IPMSM), this paper introduces an implementation of cost effective real time embedded control system. Scalar (constant V/f) closed loop speed control strategy was implemented using a conventional PI regulator in conjunction with space vector pulse width modulation (SVPWM) technique. The motor speed has been obtained using incremental shaft encoder with reasonable resolution and price. Due to the necessity of accurate position and current measurements, fast PI controller actions, and digital implementation of SVPWM technique, a suitable digital signal controller (DSC) has been used as the computing and control center. Optimized embedded software was developed using C programming language combined with assembly instructions. Several experimental results show that the proposed drive system has a worthy dynamic response and precise tracking of the speed trajectory in a wide speed range, including zero speed without losing synchronization.