Variable Frequency Drives (VFDs) are designed and built to improve the performance and control of motors. Variable Frequency Drives (VFDs) have evolved from simple speed controllers into "smart power converters" that act as the interface between the electrical grid and mechanical motion. Variable Frequency Drives (VFDs) have transcended their original role as simple speed controllers. They now function as by precisely modulating the frequency and voltage of the power supply, VFDs allow motors to work smarter and more efficiently.