What is a VFD?

A VFD (Variable Frequency Drive), also referred to as a VSD (Variable Speed Drive), inverter or drive, is a piece of hardware that is used to control the speed of an AC Induction motor. This is achieved by the VFD controlling the Frequency output (Hz) (in conjunction...

What is the difference between a VFD and a VSD?

Nothing. Both terms are used for describing drive inverters. They are prominently being used interchangeably, depending on the manufacturer of the country. (For Mitsubishi FA, the term VFD is mostly used.). VSD (Variable Speed Drive) refers to the motor shaft...