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A frequency inverter reducer is a complete drive solution with a gearbox, motor and variable frequency drive that are specifically paired together based on the application requirements. There is a significant advantage when the relationship between the motor, gearbox and VFD are considered as a complete system during the selection processes. Doing such can result in a cost effective and more energy efficient solution.
Variable frequency drives (also called "VFDs," "AC vector drives," "inverters" or "variable speed drives") can be thought of as a motor controller that operates the motor by changing the applied voltage and frequency to the motor. A VFD can control the speed of a motor, as well as how it starts and stops. One advantage of using a VFD is it limits the inrush (starting) current, which is easier on the motor.
According to Electrical Construction and Maintenance Magazine, variable frequency drives are "the most effective motor controller in the industry today."