In the 1960s, VFDs had rather small solid-state components that limited the amount of current the VFD could supply to the motor. According to the variable frequency drive working principle, it's the electronic controller specifically designed to change the frequency of voltage supplied to the induction motor. If the frequency is increased above 50 Hz, the motor will run faster than its rated speed, and if the frequency of the supply voltage is less than 50 Hz, the motor will run slower than its rated speed. This means that if the voltage applied to an AC motor is 50 Hz (used in countries like China), the motor works at its rated speed. The AC-induction motor can have its speed changed by changing the frequency of the voltage used to power it. VFD for AC motors have been the innovation that has brought the use of AC motors back into prominence. A basic VFD system generally consists of an AC motor, a controller, and an operator interface. This is definition used in all topical discussion on this paper. VFD is shorted for Variable Frequency Drive (also known as AC Drives and Inverters) - that's used to make an AC motor working in variable speed (among other parameters).
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