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Simply put, a variable speed drive is a controller that allows a machine to run at different speeds depending upon automated input from an industrial process. That in turn provides the ability to provide smoother operations, and most importantly, energy savings by slowing down machinery when a process does not have to run at full speed.Long a leading book on this class of controllers, this new edition by industry authority David Spitzer will provide the latest improvements to variable speed drives, including automated "smart" feedback systems.
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