VFD

A variable-frequency drive (VFD) is a type of motor drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and, depending on topology, to control associated voltage or current variation.
Variable frequency drives (VFD) enable speed control for 3-phase AC motors such as those EOT Cranes, conveyors, fans, pumps and shop tools. In ratings up to 300hp.