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Variable Frequency Drives

A variable-frequency drive (VFD) is a system for controlling the rotational speed of an alternating current (AC) electric motor by controlling the frequency of the electrical power supplied to the motor. A variable frequency drive is a specific type of adjustable-speed drive.

Variable-frequency drives are also known as adjustable-frequency drives (AFD), variable-speed drives (VSD), AC drives, micro-drives or inverter drives. Since the voltage is varied along with frequency, these are sometimes also called VVVF (variable voltage variable frequency) drives.

Variable-frequency drives are widely used in ventilation systems for large buildings; variable-frequency motors on fans save energy by allowing the volume of air moved to match the system demand. They are also used on pumps, elevator, conveyor and machine tool drives.

Control Techniques, a part of Emerson, is a leading manufacturer of motor control and power conversion technology for commercial and industrial applications.

Seco AC/DC drives boast a reputation for quality and service. Seco AC/DC develop product lines for both new and existing high-technology markets. The brand, currently trademarked BRONCO® AC Drives, is used in a variety of applications from industrial fans to pumps.

KB Electronics Inc, manufactures and inventories over 200 different models of, Off-The-Shelf, Variable Frequency Digital and Hybrid AC Drives (AC Inverters), Variable Speed Hybrid and Analog DC Motor Controls, Brushless Hybrid DC Drives, DC-DC Hybrid Battery Controls and Fan Controls.

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