What does the term "VFD" stand for in motor control?

The term "VFD" stands for Variable Frequency Drive. This device is crucial in motor control as it regulates the speed and torque of an electric motor by varying the frequency and amplitude of the electrical power supplied to it. When the frequency of the power supply is altered, it directly affects the speed at which the motor operates, allowing for precise control over its performance. This versatility makes VFDs widely used in various applications, from industrial processes to HVAC systems, where energy efficiency and control are essential.

The other options presented do not accurately capture the primary function of a VFD or the terminology associated with it, as they either misrepresent the concepts or introduce unrelated terms that do not pertain to motor control.