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Electrical Applications 2 by David W. Tyler

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104 DC
machines
(b) Iron losses. Since the armature is subjected to alternating mag-
netisation as it passes under north and south poles, there will be
hysteresis and eddy current losses in the
steel.
The hysteresis loss
is
a
function of
:
(1) the maximum flux density (2) the grade of steel used
and (3) the speed of rotation of the armature. Eddy current losses
are a function of: (1) the maximum flux density (2) the thickness of
the laminations used (3) the resistivity of the steel and (4) the speed
of rotation.
Commutator losses
(a) Resistance
loss.
There
is
resistance bet