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Electrical Applications 2 by David W. Tyler

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80 DC
machines
Force
=
mass
x 9.81
Power
= ei
watts Work done
=
power
x
time
= ei x
time
flux linked
\
x
/ :
Therefore, work done
x time
=
Bldi joules.
Mass (kg)
Figure
6.2
time
/
But work done
=
force
x
distance operated through
Therefore, Bldi = force
x d
Force
= Bli
newtons.
Thus
to
generate
an e.m.f. the
requirement
is for
magnetic flux,
a
conductor
and
relative motion between them.
To
produce
a
force
on
a conductor
the
requirement
is for
magnetic flux
and a