A variable frequency drive (VFD) is the single most common energy-saving upgrade on any plant floor. It controls the speed of an AC motor instead of letting it run flat-out, which is why pumps, fans, conveyors, and HVAC systems almost always run better — and cheaper — with one installed.
This hub covers VFDs from first principles to selection: what a drive actually does inside, where the energy savings come from, and how VFDs behave on real equipment like pumps and air handlers.
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