Red Seal Industrial Electrician Exam 2025 – 400 Free Practice Questions to Pass the Exam

The primary function of a Variable Frequency Drive (VFD) is to control the speed and torque of an AC motor. This is achieved by varying the frequency and voltage supplied to the motor. By adjusting the frequency of the electrical supply to the motor, the VFD allows for precise control over the motor's speed, which can lead to energy savings, improved process control, and enhanced performance in applications such as fans, pumps, and conveyors.

VFDs are crucial in industrial settings where varying process requirements may demand different motor speeds and torque levels. The ability to modulate these parameters not only helps in achieving operational efficiency but also prolongs the lifespan of the motor by reducing mechanical stress during startup and operation.

This function distinguishes VFDs from other devices—such as those that might regulate temperature, offer protection during power failures, or convert current types—illustrating their specific role in motor control applications.