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Motor Efficiency Cost Analysis Follow-up

May 20, 2009
(Motor and Power System Testing)

“At what % efficiency would you consider a motor to be too large for its application?”

Motor efficiency should not be the only indicator for determining an oversized motor for an application.

Motor efficiency often only varies 1 to 2% between no load and full load. This is an often overlooked detail in cost analysis. A 100 HP motor supplying a 60 HP application may still run within 2% of its designed efficiency. The right approach is to compare the power required to deliver 60 HP from a 100 HP motor operating at the low end of its efficiency range versus the power required to deliver 60 HP from a 60 HP motor operating at the top of its efficiency range.

Tip provided by PdMA Corporation
Phone: 813-621-6463
http://www.pdma.com

 

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Comments (1)

  • Are you considering the power factor within this efficiency calcution, because when we use less power (hp) than the nominal power designed this parameter decreased a lot.

    Best regards

    1) Posted 8:08 am, 21 May 2009 by João Carlos R. Domingues

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