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Electrical Applications 2 by David W. Tyler

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DC
machines
103
Changes in characteristics due to Armature reaction causes the magnetic field in a d.c. machine to be
armature reaction twisted round which concentrates the flux into one side of each pole
piece so that this side may be driven into saturation as a result. Since
the top limit to flux density in iron is in the region of 1.6 to 1.8 tesla
this may result in a reduction in total flux.
Example
10.
The
normal flux density of
the poles
in a d.c. gen-
erator on no load is 1.1 T. Each pole has a cross-sectional area
of 0.05 m
2
. The effect o