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Electrical Applications 2 by David W. Tyler

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DC
machines
83
Unidirectional pulses from the one
coil,
Figure
6.10 2
segment commutator machine
The
e.m.f.
generated
in the
coil
is
alternating
but by
using
a
mechanical reversing switch
or
commutator, the current flowing
in
the external circuit
is a
series
of
unidirectional pulses.
THE RING-WOUND
ARMATURE
Figure
6.11
In
Figure
6.11
the
laminated iron core
is
wound with
ten
coils each
having
two
turns. The commutator
has ten
segments,
one for
each
coil.
The
magnetic flux produced
by the
poles crosses
the air gap