Variable Frequency Drive (VFD) can be used to control the speed of three-phase induction motor. A variable frequency drive is a system equipped for controlling the rotational speed of an alternating current (AC) electric motor by controlling the frequency of the electrical power supplied to the motor. Single phase to three phase VFD drive normally is used in 200V AC to 240V AC in low power applications, like small pumps. The AC motor's input need to be three phase as all of the drives are three phase output. In our factory, the 1 phase AC drives, from 0.4kW to 2.2kW.