The Official Variable Frequency Drive (VFD) Distributing Blog

Machinery imported into the United States is often rated at an operating frequency of 50 Hertz.  Unless engineered for operation at 60 Hz., this can be problematic for electric motors. This is especially true when operating pump and fan loads.  Too often the distributors and purchasers of this machinery assume that the Original Equipment Manufacturer [...]

Many electricians apply Variable Frequency Drives (VFDs) to AC Motors that are not inverter rated. Many are not even aware that inverter rated motors exist.
Inverter rated motors are not required for inverter applications, however, when a VFD is applied to an inverter rated motor, the inverter rated motor has less chance of premature winding failure. Inverter rated motors have [...]

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 [...]