Learning Center

What is a Variable Frequency Drive?

By Craig Hartman on 20th Mar 2014

Updated on October 1st 2025 A variable frequency drive (VFD) is a type of motor controller that can adjust the speed of an AC electric motor. It does this by varying the frequency and voltage supplied to the motor. A variable …

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VFD Buying Guide

By Paul Rossiter on 17th Jan 2014

Finding the Best Variable Frequency Drive Finding the perfect VFD or motor controller isn’t easy. A lot depends on the unique needs of your application and system. There isn’t a catch-all model or brand to fall ba …

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