Study on High-Efficiency Brushless DC Motor for Compressor

In Japan, room air conditioners, mainly heat-pump type, have been widely introduced into households. And "one unit to one room" really features today rather than "one unit to one home" in the past. In the circumstances where room-by-room air conditioning or all-season air conditioning systems are increasing, reduction of electric power consumption strongly required. As a consequence, the efficiency of a compressor, a core component of each air cond itioner, must be improved more emphatically than everbefore. To cope with the requirement, the authors developed a new t.ype of DC twin-rotary compressor having a newly developed brushless DC motor, that is driven most efficiently using a digital control system.