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A Caltech Library Repository Feedhttp://www.rssboard.org/rss-specificationpython-feedgenenWed, 31 Jan 2024 19:11:15 +0000Determination of the Mutual Inductance of End Turns of Induction Motors
https://resolver.caltech.edu/CaltechTHESIS:01302017-160837563
Authors: {'items': [{'id': 'Hawley-Paul-Frederick', 'name': {'family': 'Hawley', 'given': 'Paul Frederick'}, 'show_email': 'NO'}]}
Year: 1933
DOI: 10.7907/KCRV-9C92
<p>The object in making the following investigation
was to facilitate the obtaining of a more accurate
determination of the reactance of the end turns of
rotating alternating current machinery. Such formulae
as are available at present are, as far as the author
knows, based on incorrect assumptions, or fail to
consider the various factors present. The accuracy of
the results obtained when using such formulae is very
small. Often the calculated reactance will not be
within 400% of the correct value. Because of this, it
was felt that a more accurate analysis of this problem
would be of value, chiefly to the designing engineer.</p>
<p>In this report, the "end turns" of the machine
windings are considered to be the part of the turns of
the coils on the armature of the machine not lying in
armature slots. These turns, the connecting conductors
between the armature bars, lie against each other in a
belt extending around the circumference of the armature.
In nearly all motor coils, the end turns consist of a
short section extending straight out from the armature
slot, a much longer section bent nearly parallel with the
core, an abruptly curved end section, and two lengths
similar to the first two. It is obvious that the accurate
determination of the inductance of such coils must take
into account the peculiar shape of the coils and the effect
of the coils upon each other. It is this second effect
which is usually neglected in determinations of the
reactance. Actually this mutual inductance is of greater
importance than the self inductance of the coils.</p>
https://thesis.library.caltech.edu/id/eprint/10035