This paper develops the brushless dc (BLDC) motor

sensorless control system for an automotive fuel pump. The sensorless

techniques that are based on a hysteresis comparator and

a potential start-up method with a high starting torque are suggested.

The hysteresis comparator is used to compensate for the

phase delay of the back EMFs due to a low-pass filter (LPF) and

also prevent multiple output transitions noise or ripple in

the terminal voltages.-This paper develops the brushless dc (BLDC) motor

sensorless control system for an automotive fuel pump. The sensorless

techniques that are based on a hysteresis comparator and

a potential start-up method with a high starting torque are suggested.

The hysteresis comparator is used to compensate for the

phase delay of the back EMFs due to a low-pass filter (LPF) and

also prevent multiple output transitions　noise or ripple in

the terminal voltages.