The 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.

A Variable Frequency Drive (VFD) – also known as an AC drive or variable speed drive – is an electronic controller that can adjust the speed and torque of an AC electric motor by varying the …

A VFD is a type of motor controller that drives an electric motor by varying the frequency and voltage of its electrical power supply. The VFD also has the capacity to control ramp-up and ramp-down of the …

A variable frequency drive (VFD) is an electronic motor control solution that regulates the speed and torque of an AC induction motor by varying the frequency and voltage of the electrical power …

Sep 4, 2025 · A VFD is a motor controller that varies the speed of an electric motor for efficiency and performance. In many industrial systems, PLCs and VFDs work well together – a PLC sends …

A PowerFlex® VFD or DC drive handles both low voltage and medium voltage applications. With a comprehensive range of power options and innovative features, our VFDs can bring performance …

Sep 10, 2025 · How Do You Control a VFD? Depending on the application, VFDs can be controlled with a variety of control schemes. Sometimes they are tasked to run a single, stand-alone machine, with …

Jun 19, 2023 · A variable frequency drive (VFD) is a device that controls the speed and torque of an AC motor by adjusting the frequency and voltage of the power supply. A VFD can also regulate the …

In short, a VFD is an intelligent controller that modulates an AC motor’s supply frequency (and voltage) on the fly, thereby governing the motor’s speed and torque output with fine granularity.

There are 4 primary types of motor control methods used to control induction motors connected to a VFD. They are: V/f (volts-per-hertz), V/f with encoder, Open Loop Vector, and Closed Loop Vector.