What is variable frequency drive (VFD) used for?

A variable frequency drive (VFD) is primarily used to control the speed of an electric motor by varying the frequency and voltage of the power supplied to the motor. This capability allows for precise control of motor speed and torque, making VFDs essential in applications where the operational speed of a motor needs to be adjusted according to real-time requirements.

By controlling the motor speed, VFDs contribute to energy savings, reduced wear and tear on mechanical systems, and improved process control. They are frequently used in HVAC systems, conveyor belts, pumps, and fans, where varying speeds can lead to more efficient operation and better performance.

Other options relate to different functionalities; for example, monitoring energy efficiency, regulating fluid temperature, and managing building occupancy are important aspects of building management but do not pertain directly to the primary function of a VFD.