The way we control the speed of fan motors or pump motors has tremendously changed in the past two decades with the introduction of variable-frequency drives (VFDs), aka variable-frequency controllers ...

The primary job of most bilge pumps on most boats is to clear infliction water from the bilges (https://en.wikipedia.org/wiki/Bilge_pump). A bilge pump is a key piece ...

A timer or pump-off controller (POC) can improve overall beam-pump efficiency for a well with a pump capacity greater than its production capacity. More than 400,000 wells in the U.S. operate with ...