BLDC motor drive system of air-condition of hybrid electric vehicle

Recently the research and development of electric compressor in the electric automobile have being focused on. In HEV (hybrid electric vehicle), the engine is turned off in the case of stop to raise fuel efficiency and prevent air pollution. The conventional air conditioner system which is worked by the engine power through belt connection can´t provide cool air to inside at the time of engine stop. Therefore, the full or hybrid electric compressor is applied for HEV. In this paper, the motor drive system of hybrid electric compressor which is using IPM type PMSM for HEV has been studied and a novel curve fitting method for getting maximum torque per unit current is proposed..