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.

include two-speed motors, adjustable speed drives, and load management strategies that maintain loads within an acceptable range. Determining if your motors are properly loaded enables you to make informed decisions about when to replace motors and which replacements to choose. Measuring motor loads is relatively quick and easy when you use the

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  Drive, Motor

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