Ventilation equipment and motor control system and method thereof

The invention relates to ventilation equipment and a motor control system and method thereof. The method comprises the following steps of: amplifying the correlation quantity of the current of the same phase by adopting a plurality of different amplification factors, outputting amplified sampling voltages, respectively carrying out analog-to-digital conversion on the plurality of sampling voltages, calculating the sampling current according to the voltage subjected to analog-to-digital conversion to obtain a plurality of sampling currents, and fusing the plurality of sampling currents according to the magnitude of the sampling currents to obtain a fused current. And an effective sampling current is determined. In the process of calculating the effective sampling current, different requirements of large and small currents on the sampling range and the sampling precision are considered, so that more accurate sampling current can be obtained, the motor control current can be accurately detected and fed back, a t