DETERMINING ELECTRIC MOTOR LOAD AND EFFICIENCY

Most likely your operation’s motors account for a large part of your monthly electric bill. Far too often
motors are mismatched—or oversized—for the load they are intended to serve, or have been rewound
multiple times.
To compare the operating costs of an existing standard motor with an appropriately-sized energyefficient
replacement, you need to determine operating hours, efficiency improvement values, and
load. Part-load is a term used to describe the actual load served by the motor as compared to the
rated 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 techniques.

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