integrating the output voltage of the voltage divider with a low pass filter, and compensating the phase delay in the low pass filter and it is to be exactly 90 phase delay. ; is output from the inverter unit generated according to the three-phase current flowing in the a-phase winding, b-phase and c-phase coils in the stator of a three-phase BLDC motor distribution in the counter-electromotive force voltage divider, and an analog / digital converter and converted into a digital voltage, and then integrated to the digital low-pass filter, to compensate the phase delay is not exactly 90 from the digital low-pass filter in the phase delay phase compensator 90 stably driving the three-phase BLDC motor to accurately control the switching operation according to the drive unit to the rotor position in the three-phase outputs of the position estimation signal E as compared with the times of the BLDC motor to the ground voltage, then the comparator so delays and be able to improve the driving efficiency.
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