Abstract — Recently, it is increased to apply sensorless drive
for BLDC (Brushless DC) motor to household electrical
appliances, especially in the refrigerators and air conditioners, to
reduce the cost and the acoustic noise by the operation and to
make their functions more comfortable for human beings. In this
paper, low-cost sensorless drive for BLDC motor is implemented
by random PWM (Pulse Width Modulation). The experimental
results show that the electromagnetic noise was reduced and the
sound quality was improved by BLDC motor sensorless random
PWM Control.