LOSS MINIMIZATION CONTROL OF PERMANENT-MAGNET SYNCHRONOUS MOTOR-DRIVES

This paper aims to improve efficiency in permanent magnet synchronous (PM) motor drives. The controllable electrical loss which consists of the copper loss and the iron loss can be minimized by the optimal cont rol of the armature current vector. The control algorithm of current v ector minimizing the electrical loss is proposed and the optimal curre nt vector can be decided according to the operating speed and the load conditions. The proposed control algorithm is applied to the experime ntal PM motor drive system, in which one digital signal processor is e mployed to execute the control algorithms, and several drive tests are carried out. The operating characteristics controlled by the loss min imization control algorithm are examined in detail by computer simulat ions and experimental results.