Transcription of Determining Electric Motor Load and Efficiency
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Determining Electric Motor Load and Efficiency
A Program of the Department of EnergyFACT SHEETThe energy savings networkPlugintoit!DEPARTMENTOFENERGYUNIT EDSTATESOFAMERICADETERMINING Electric MOTORLOAD AND EFFICIENCYMost likely your operation s motors account for a large part of your monthly Electric bill. Far too oftenmotors are mismatched or oversized for the load they are intended to serve, or have been re-wound multiple compare the operating costs of an existing standard Motor with an appropriately-sized energy-efficient replacement, you need to determine operating hours, Efficiency improvement values, andload. Part- load is a term used to describe the actual load served by the Motor as compared to therated full- load capability of the Motor . Motor part-loads may be estimated through using input power,amperage, or speed measurements.
4 Line Current Measurements The current load estimation method is recommended when only amperage measurements are available. The amperage draw of a motor varies approximately linearly with respect to load, down to about 50% of full load.
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