http://iet.metastore.ingenta.com
1887

The measurement and prediction of induction motor stray loss at large slips

The measurement and prediction of induction motor stray loss at large slips

For access to this article, please select a purchase option:

Buy article PDF
$19.95
(plus tax if applicable)
Buy Knowledge Pack
10 articles for $120.00
(plus taxes if applicable)

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Learn more about IET membership 

Recommend Title Publication to library

You must fill out fields marked with: *

Librarian details
Name:*
Email:*
Your details
Name:*
Email:*
Department:*
Why are you recommending this title?
Select reason:
 
 
 
 
 
Proceedings of the IEE - Part C: Monographs — Recommend this title to your library

Thank you

Your recommendation has been sent to your librarian.

It is shown that the stray loss in induction motors, at fractional slips greater than about 0.25, is almost entirely due to tooth ripple in the zigzag leakage flux. The stray loss is large; it can double the torque at a slip of 2.0 and can lead to serious errors when calculating accelerating and braking performance. In the normal operating range, i.e. slip less than 0.05, although the stray loss is much lower it is still appreciable, and the component associated with tooth ripple in the main flux is of importance. Experimental evidence, both from actual machines and from high-frequency loss in samples of laminations, indicates that the zigzag leakage flux component of the loss is approximately proportional to (speed)1.6 and (current)1.9, and the results of the American Standard reverse-rotation test extrapolated according to this law are sufficient, together with the no-load stray loss, to predict the total stray loss over the whole practicable speed range.A simple method for calculating the stray loss is given and its limitations are indicated. Calculated values of the loss are compared with the measured losses, but no definite conclusions as to the accuracy of the calculations can be drawn until more is known of the highfrequency loss in machine laminations.

Inspec keywords: losses; induction motors

Subjects: Asynchronous machines

References

    1. 1)
      • G.H. Rawcliffe , A.M. Menon . A Simple New Test for Harmonic-Frequency Losses in A.C. Machines. Proc. I.E.E., Part II
    2. 2)
      • T. Morgan , W.E. Brown , A.J. Schumer . Reverse Rotational Tests for the Determination of Stray-Load Loss in Induction Motors. Transactions of the American Institution of Electrical Engineers
    3. 3)
      • T. Morgan , W.E. Brown , A.J. Schumer . Induction Motor Characteristics at High Slip. Transactions of the American Institution of Electrical Engineers
    4. 4)
      • D.H. Ware . Measurement of Stray-Load Loss in Induction Motors. Transactions of the American Institution of Electrical Engineers
    5. 5)
      • (1954) , American Standard Test Code for Polyphase Induction Motors and Generators.
    6. 6)
      • High Frequency Losses in Lohys, Sankey data book.
    7. 7)
      • C. Dannatt . The Variation of the Magnetic Properties of Ferromagnetic Laminae with Frequency. Journal I.E.E.
    8. 8)
      • D. Morris . Some Tests of an Exact Theory of the Transformer. Proceedings I.E.E.
    9. 9)
      • D. Morris . Some Tests of an Exact Practical Theory of the Induction Motor. Proceedings I.E.E.
    10. 10)
      • W.J. Gibbs . Tooth Ripple Losses in Unwound Pole-Shoes. Journal I.E.E.
    11. 11)
      • D.B. Hoseason . Tooth Frequency Iron Losses in Slip Ring Induction Motors. Electrician
    12. 12)
      • F.T. Chapman . (1930) , A Study of the Induction Motor.
    13. 13)
      • P.L. Alger . (1951) , The Nature of Polyphase Induction Machines.
    14. 14)
      • H. Vickers . (1953) , The Induction Motor.
    15. 15)
      • A.E. Clayton . (1938) , The Performance and Design of Direct Current Machines.
http://iet.metastore.ingenta.com/content/journals/10.1049/pi-c.1957.0035
Loading

Related content

content/journals/10.1049/pi-c.1957.0035
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Loading
This is a required field
Please enter a valid email address