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How to Calculate Motor Efficiency for Variable Speed Centrifugal Pumps

July 29, 2003
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Knowing the efficiencies of the pump, VSD, and motor will enable the engineer to calculate the kW input for a pump, from minimum to maximum flow and head conditions for that pump. Here, the author goes through that calculation process, also noting that a standard reference for identifying induction motor efficiencies at reduced speeds or loads is overdue. By James B. (Burt) Rishel, P.E.
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