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Variable Speed Drives, 4th Edition by David William Spitzer

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Variable Frequency Drive Technology

10

Many alternate final control elements were considered necessary evils in the past when maintenance and operating costs may have been of little concern to the individual selecting alternate final control equipment. Present applications of this technology should be examined as an opportunity to improve the cost effectiveness of a process and reduce maintenance, which represents a radical shift in the light in which alternate final control elements are viewed.

While all of the alternate final control elements have their place, recent technical developments and cost reductions, primarily in the field of semiconductor technology, have resulted in an increased application of electronic variable frequency drive ...

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