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. This fact sheet briefly discusses several load estimation to Determine Motor LoadingMost Electric motors are designed to run at 50% to 100% of rated load.
amperage draw of a motor varies approximately linearly with respect to load, down to about 50% of full load. (See Figure 3.) Below the 50% load point, due to reactive magnetizing current requirements, power factor degrades and the amperage curve becomes increasingly non-linear. In the low load region, current measurements are not
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