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 .

and the amperage curve becomes increasingly non-linear. In the low load region, current measurements are not a useful indicator of load. Figure 3 Relationships Between Power, Current, Power Factor and Motor Load Example: Input Power Calculation An existing motor is identified as a 40-hp, 1800 rpm unit with an open drip-proof enclosure.

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