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VFD'S  ( Variable-Frequency Drive )

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

VFDs are used in applications ranging from small appliances to the largest of mine mill drives and compressors. However, about a third of the world's electrical energy is consumed by electric motors in fixed-speed centrifugalpump, fan and compressor applications and VFDs' global market penetrationfor all applications is still relatively small. This highlights especially significant energy efficiency improvement opportunities for retrofitted and new VFD installations.

Over the last four decades, power electronics technology has reduced VFD cost and size and improved performance through advances in semiconductor switching devices, drive topologies, simulation and control techniques, and control hardware and software.

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