The predetermination of the performance of induction motors

Abstract
The accuracy with which the performance of induction motors can be forecast in actual practice has not yet reached that attained in connection with other types of machines. An indication of this lies in the recognized tolerances on guarantees, especially those on power factor. The inaccuracies do not arise from ignorance of the conditions on the designer's part but rather from Jack of time to take into account all the factors.This paper is intended to describe a quick yet accurate means of predetermining the performance of induction motors. A group of accurate formulae is developed on the basis outlined by Steinmetz and is given alongside the corresponding approximate formulae which have hitherto been much used on account of their simplicity. Curves are then drawn showing the difference between the results given by the two groups of formulae, the ratios being expressed as correction factors. It is thus possible to obtain results approaching the accuracy of the more involved systems of calculation, by using the simplest formulae and applying the appropriate correction.Finally, two examples are given indicating the accuracy obtained by the use of the curves.

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