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What is a Variable Frequency Inverter Drive?

A variable Frequency Inverter drive (also termed adjustable-frequency drive, variable speed drive, AC drive, micro drive or inverter drive) is a type of adjustable-speed drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and voltage.



Frequency Inverter are used in applications ranging from small appliances to the largest of mine mill drives and compressors. About 25% of the world's electrical energy is consumed by electric motors in industrial applications, which are especially conducive for energy savings using Frequency Inverter in centrifugal load service.


A frequency inverter changes output voltage frequency and magnitude to vary the speed, power, and torque of a connected induction motor to meet load conditions. A typical frequency inverter consists of three primary sections:


Rectifier Intermediate circuit/dc bus Inverter

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