Power generator starts, the motor rated current is higher than 5-6 times will not only affect the motor life and consume more power. Power generator drive system design will be left on in the selection of a certain motor Margin, the motor speed is fixed, but in actual use, sometimes lower or higher speeds, so the frequency transformation is necessary. Converter can achieve soft-start motor, by changing the frequency of the input voltage equipment, the purpose of energy-saving speed, and give the equipment over-current, over voltage, overload protection.