There is great emphasis on efficiency in the world today, and the manufacturers and users of adjustable speed drives are certainly not exempt from this concern. Determining the best drive for a particular application can be a time consuming process which should include not only evaluation of performance and acquisition cost but also the cost of ownership.
In a great many applications, the Eddy Current drive is one of the strongest contenders, but it is sometimes discarded without a thorough investigation into all of the elements which make up the total cost of ownership.