What is the primary function of Variable-Frequency Drives?

The primary function of Variable-Frequency Drives (VFDs) is to control the speed of an AC motor by varying the frequency and voltage of the electrical power supplied to it. By adjusting these parameters, VFDs allow for fine-tuned control over motor speed, torque, and acceleration, which can lead to improved efficiency and performance in various applications, such as water treatment facilities where motor speed needs to adjust based on demand.

Controlling the speed of a wound-rotor induction motor is a specific application of VFDs, as these drives can optimize the performance characteristics of such motors, providing flexibility in how they operate in specific circumstances. In essence, VFDs serve to enhance operational control, energy savings, and process efficiency in various industrial and municipal applications, including water distribution and treatment systems.