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VFDs are motor controllers which drive the motor by adjusting the voltage and frequency supplied to it. VFDs feature converter which consists 6 diodes, just like the check valves of a plumbing system. These diodes allow the flow of current in a single direction which is mentioned in the diode symbol.
A variable-frequency drive is a device used in a drive system consisting of the following three main sub-systems: AC motor, main drive controller assembly, and drive/operator interface.he VFD controller is a solid-state power electronics conversion system consisting of three distinct sub-systems: a rectifier bridge converter, a direct current (DC) link, and an inverter. Voltage-source inverter (VSI) drives (see 'Generic topologies' sub-section below) are by far the most common type of drives.