A novel concept in high speed power analysis allows the start-up current curve of electric motors to be analyzed within a matter of seconds. This start-up current curve offers insight into various motor quality parameters. The start-up current level is proportional to the (instantaneous) slip frequency, i.e. the difference between motor rotational speed and the line frequency. Thus, the start-up curve is representative for the acceleration pattern of the motor. The start-up curve therefore allows conclusions to be drawn about start-up torque, mechanical friction, and other aspects that may impede normal acceleration to operating speed. Measuring the start-up curve takes only a second or fraction thereof, and subsequent data analysis is completed within a few seconds. Therefore, start-up current analysis appears to be suited to assess motor quality in high volume production applications, such as found in household appliance manufacturing operations.
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