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A Novel Approach to Determining Motor Load
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Date
1992-04
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Energy Systems Laboratory (http://esl.eslwin.tamu.edu)
Abstract
Properly sized electric motors are essential if industrial plant
efficiency is to be optimized and energy costs minimized. Because of
the difficulty in making power measurements on three phase motors,
loading is rarely, if ever, checked. A simple indication of motor load
can be achieved by measuring operating speed because speed and load
are almost linearly related. The decrease in motor speed from no load
conditions, referred to as slip, can be determined with a non-contact,
optical tachometer. Field measurements of motor slip were conducted
at a textile plant to quantify motor load conditions. To verify the
relationship between operating speed and load, measurements of motor
power consumption on a representative number of motors were also
conducted. The results of the motor survey, including number of
motors, size, and load, are summarized in this paper along with an
estimate of the savings from replacing oversized motors.
Description
Keywords
Electric Motor Load, Motor Survey