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.
parameters taken from hand-held instruments, you can use Equation 1 to calculate the three-phase input power to the loaded motor. You can then quantify the motor ’s part-load by comparing the measured input power under load to the power required when the motor operates at rated capacity. The relationship is shown in Equation 3. Equation 1 ...
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