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Don energy efficient motors always cost less to operate?

April 26, 2017COST motors operate

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Don energy efficient motors always cost less to operate?

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Energy efficient motors have a lower rotor and stator resistance and thus a higher inrush current and full-load speed than standard-efficiency motors. Speed changes significantly affect the power draw by centrifugal loads. The shaft power requirements for a centrifugal fan or pump loads varies as the cube of the speed while the flow of air or fluid discharge varies linearly with speed.