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VSD advantages, disadvantages, selection criteria and ...
APPLICATION energize - May 2005 - Page 44 This document seeks to help users to understand and simplify the process of selection , installation and the use of a VSD. Users should see it as a long-term relationship and investment when acquiring a motors are the workhorses of industry and commerce. Each day large numbers of industrial electric motors are sold throughout the world. These motors are reliable and inexpensive. However they are fixed speed devices, and most applications require a variable speed output from the motor . Frequently this is obtained by coupling some mechanical device (clutch, gear, belt and pulley, etc.) to the motor . These methods are inefficient in terms of mechanical wear and energy advantagesVSDs have many advantages and manufacturers of VSDs claims different advantages for their units.
If the efficiency of the system can be improved the power demand drops proportionally with the increased efficiency. Almost all fans, pumps and compressors are over designed (just in case) and seldom do they work at their maximum designed efficiency point. Fitting an inverter to a fan, pump or compressor motor varies the motor speed which then
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