A high-efficiency PM-assisted synchronous reluctance motor drive

A three-phase 6/4-pole PM-assisted synchronous reluctance motor (PMA-SynRM) drive is presented in this paper. To make the motor drive suitable for energy-saving air-conditioners or other industrial applications, a PMA-SynRM current vector drive based on unity-power factor control scheme was implemented to achieve high performance with high efficiency, high torque, low acoustic noise, and quick speed response. Experimental results show that when a three-phase, 400-W, 6/4-pole, PMA-SynRM is operated from 100 rpm to 3000 rpm, the drive system´s efficiency can reach 86∼88%; its error in steady-state speed can also be kept below 0.3 %, its maximal acoustic noise at 70 dB , its maximal shaft torque at 3 N-m , and its speed response quick. It is very suitable for a high-performance automation applications with energy-saving.