Online loss minimization based vector control of IPMSM drive

A model based loss minimization algorithm for speed control of interior permanent magnet synchronous motor (IPMSM) drive is proposed in this paper. The efficiency of variable speed drives can be optimized by either the proper design of the motor or selecting the appropriate control techniques or both. In this work, the loss minimization algorithm is developed based on motor model and operating conditions. The d-axis armature current is utilized to minimize the losses of the IPMSM in a closed loop vector control environment. The complete drive is experimentally implemented using DSP board DS1104. The effectiveness of the proposed efficiency optimization algorithm is tested in both simulation and experiment at different operating conditions. It is found for the results that the efficiency of the proposed IPMSM drive is improved significantly as compared to the conventional i_d=0 control technique.