Variable frequency drive
WHAT IS MEANT BY VFD? A variable frequency drive is an electronic controller that adjusts the speed of an electric motor by regulating the power being delivered. Variable-frequency drives provide continuous control, matching motor speed to the specific demands of the work being performed. Variable-frequency drives are an excellent choice for adjustable-speed drive users because they allow operators to fine-tune processes while reducing costs for energy and equipment maintenance. Figure 1- VFD Drive General Outline NEED FOR A VARIABLE FREQUENCY DRIVE Variable speed, depending upon the load requirement, provides significant energy saving. A reduction of 20% in the operating speed of the motor from its rated speed will result in an almost 50% reduction in the input power to the motor.This is not possible in a system where the motor is directly connected to the supply line. If a variable voltage ...