October 2013
Beginner to intermediate
352 pages
15h 8m
English
Content preview from Electric Motors and Drives, 2nd Edition
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Operating Characteristics of Induction Motors 223
j Laminated
Stator
Main
Coi
l
Shading
"Ring
Cage
"Rotor
Figure 6.20 Shaded-pole induction motor
But some of the flux passes through the shading ring, and
because it is alternating it induces an
e.m.f.
and current in the
ring. The opposing MMF of the ring current diminishes and
retards the phase of the flux through the ring, so that the flux
through the ring reaches a peak after the main flux, thereby
giving what amounts to a rotation of the flux across the face of
the pole. This far from perfect travelling wave of flux produces
the motor torque by interaction with the rotor cage. Efficien-
cie ...
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