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Electric Motors and Drives
book

Electric Motors and Drives

by Austin Hughes
October 2013
Beginner to intermediate content levelBeginner to intermediate
316 pages
13h 14m
English
Newnes
Content preview from Electric Motors and Drives
Induction Motors - Rotating Field, Slip and Torque 157
v
1
Figure 5.8 Phasor diagram under no-load conditions, showing magnetizing
current I
m
Viewed from the supply the stator looks more or less like
a pure inductance, a fact which we would expect intuitively
given that - having ignored the rotor circuit - we are left
with only an arrrangement of flux-producing coils sur-
rounded by a good magnetic circuit.
Summary
When the stator is connected to a three-phase supply, a
rotating magnetic field is set up in the air-gap. The speed of
rotation of the field is directly proportional to the frequency
of the supply, and inversely proportional to th ...
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Publisher Resources

ISBN: 9781483105277