The Official Variable Frequency Drive (VFD) Distributing Blog

An AC Variable Frequency Drive (VFD) is commonly referred to as an “Inverter”. This is because of the way a VFD works.  The following details the inner workings of a VFD: 

Alternating Current (AC) power is applied to the input of the VFD and feeds a bridge rectifier.
The rectifier converts the Alternating Current (AC) voltage [...]

Variable Frequency Drives (VFDs) are electronic devices used to control the speed of an Alternating Current Motor (AC Motor).  Variable Frequency Drives (VFDs) are also commonly known as adjustable frequency drives, adjustable speed drives, AC drives and inverters.
Variable Frequency Drives (VFDs) have a wide range of application use that include, but are not limited too:

Variable Air Volume Systems
Circulating [...]