Tips of Frequency conversion Technology（4）

What is the starting current and starting torque of the motor when the inverter is used?

The frequency and voltage are increased with the speed of the motor, and the starting current is limited to 150% rated current (125 / 200 according to the type of machine). When starting directly with power frequency power supply, the starting current is 6 ~ 7 times, therefore, there will be mechanical and electrical impact. Using frequency converter drive can start smoothly (starting time becomes longer). The starting current is 1.5 times of the rated current, and the starting torque is 70% 120%. For frequency converter with torque automatic enhancement function, starting torque is more than 100%, can start with a full load.