The Official Variable Frequency Drive (VFD) Distributing Blog

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 [...]

If you do not yet know how a Variable Frequency Drive (VFD) works, it is recommended you visit our post entitled: How Does A Variable Frequency Drive (VFD) Work? prior to reading this post.
AC Three Phase Induction Motor RPM is determined by the formula:

RPM = (120 * Frequency) / # of poles in the motor

Since [...]

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 [...]

When applying a Variable Frequency Drive (VFD) to a new or existing application there are many factors to consider prior to making a firm decision on what type of Variable Frequency Drive (VFD) should be used. If one already has an existing application where VFDs seem to consistently fail, they should look to using a different VFD type for potential success. For a [...]

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 [...]