According to statistics, the largest number of motors used in the refrigerator, up to about 5; air conditioning and drying and washing machines to be used in two motors. DC fan motor refrigerators, ice machines and automatic dampers, drying and washing machine throttle and drainage / water supply pump applications typically use the single-chip integrated motor drive, and air conditioner outdoor unit DC fan / indoor unit DC fan motor will use the washing machine and dryer to the motor controller. The motor driver / controller for voltage and current range is also different, as shown in Figure 1.