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 . Maximum Efficiency isusually near 75% of rated load .
2 Figure 2 Motor Power Factor (as a Function of % Full-Load Amperage) Overloaded motors can overheat and lose efficiency. Many motors are designed with a …
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