Online Efficiency Optimization of a Fuzzy Logic Controller Based IPMSM Drive

This paper presents an online loss minimization algorithm (LMA) for a fuzzy logic controller (FLC) based interior permanent magnet synchronous motor (IPMSM) drive to yield high efficiency and high dynamic performance over wide speed range. The loss minimization algorithm is developed based on the motor model. In order to minimize the controllable electrical losses of the motor and thereby maximize the operating efficiency the d-axis armature current is controlled optimally according to the operating speed and load conditions. For vector control purpose, a fuzzy logic controller (FLC) is used as a speed controller which enables the utilization of the reluctance torque to achieve high dynamic performance as well as to operate the motor over a wide speed range. In order to test the performance of the proposed drive in real-time, the complete drive is experimentally implemented using DSP board DS1104 for a prototype laboratory 5 hp motor. The performance of the proposed loss minimization based FLC for IPMSM drive is tested in both simulation and experiment at different operating conditions. A performance comparison of the drive with and without the proposed LMA based FLC is also provided. It is found from the results that the proposed LMA and FLC based drive demonstrates higher efficiency and better dynamic responses over FLC based IPMSM drive without LMA.