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The measurement of induction-motor stray loss and its effect on performance

The measurement of induction-motor stray loss and its effect on performance

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Stray losses are shown to affect the performance of induction motors to a very considerable extent—far greater than is indicated in B.S. 269. The sources of loss and methods for isolating the contribution of each to the whole are discussed. It is suggested that the total loss should be taken as the sum of the components, and this proposal is shown to be accurate except at small negative slips when the loss is much greater than such a calculation indicates. A single easy test, the reverserotation test, extrapolated according to simple rules, is shown to be sufficient to predict the stray loss under all conditions (including d.c. excitation) with sufficient accuracy for the majority of purposes, and it is proposed that such a test should replace the existing recommendations of B.S. 269.

References

    1. 1)
      • T. Morgan , W.E. Brown , A.J. Schumer . Reverse Rotation Tests for the Determination of Stray-Load Loss in Induction Motors. Transactions of the American I.E.E.
    2. 2)
      • T. Morgan , W.E. Brown , A.J. Schumer . Induction Motor Characteristics at High Slips. Transactions of the American I.E.E.
    3. 3)
      • D.H. Ware . Measurement of Stray-Load Loss in Induction Motors. Transactions of the American I.E.E.
    4. 4)
      • G.H. Rawcliffe , A.M. Menon . A Simple New Test for Harmonic-Frequency Losses in A.C. Machines. Proceedings I.E.E.
    5. 5)
      • Barton, T.H., Ahmad, V.: `The Measurement and Prediction of Induction Motor Stray Loss at Large Slips', Monograph No. 219 U, Proceedings I.E.E., January 1957, 104, p. 299.
    6. 6)
      • J.H. Kuhlman . (1950) , Design of Electrical Apparatus.
    7. 7)
      • D. Morris . Some Tests of an Exact Practical Theory of the Transformer. Proceedings I.E.E.
    8. 8)
      • D. Morris . Some Tests of an Exact Practical Theory of the Induction Motor. Proceedings I.E.E.
    9. 9)
      • (1954) American Standard Test Code for Polyphase Induction Motors and Generators.
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