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5. 5
POWER CIRCUIT
5. 4
Power Circuit
A.
AC generator
The
operating
principle
of
the
AC generator
is
the same as for the flywhee
l
magneto
or the
DC
generator.
Electricity
is produced by
the iron core
cutting
across the
magnetic fie ld.
In an AC
generator,
the voltage
produced changes
direction alternately,
the frequenc
y
per revolution
being
dependent upon the
number
of magnetic pole
pieces.
One
frequency change cycle
occur each
revolution
for
two pole pieces.
As
an example, a
six pole
AC generator
will
have
3
frequency change
cycle
occuring
every revolution
.
The change in output
voltage
is
dependent upon
the
strength
of
the
magnetic field.
This
change is
brought about by
the
number
of poles,
magnetic
strength
of
po les, speed of the generator,
or
by
the number
of windings in the
co il.
The
advantage of the A.
C.
generator
is that the
malfunction as compared to the
other
type generator
is
for
less
due
to its
simple
construction and fewer
moving ports which
are
subject
to wear.
Another
major
advantage is
that
the
kick
starter
con be
employed
as an
auxiliary starting method
whenever the
battery is completel
y
discharged.
This
is possible since the
A.
C.
generator
induces
a large voltage
which
when
fed
through the rec-
tifier to the ignition co,, or when
fed directly
to
the ignition coil
will
produce
spark sufficiently
large
to produce an ignition spark.
This feature is for the fact that since the
battery
mounted
on motorcycle
is a low capacity
type and
the battery
often
becomes completely discharged
due to carelessness.
(i:;ig. 5,
26, 27.
28)
B.
Current Limite
r
The current limiter is
used
to
prevent
the bat-
tery from overcharging
during
long
period of driving
at
high speed.
Current limiter
used
on the
450
is a
new
SCR (Silicon controlled
rectifier!
type
which has
no moving ports, an
electron
ic
rela
y
utilizing the
special
features
of the
semi-conductor.
It is compact, light and easy to
install.
Its
biggest
advantage
is
that it provides
very stable
control
of
the output
voltage
and its
use
is
semi-permanent.
{Fig, 5.
29)
fig.
5. 26
A. C generator
Fig. 5
.
27
Construct
ion of
the
AC
generotor
CD
Stator
@
Coil
,
®
Rotor
©
Crankshaft
CD
®
@
@
Fig.
5. 28
Circuit of AC generator
CD
Yellow ldaytimel
®
Pink lnight timel
@
Brown
fcommonl
©
Generator
I
L_~
..... ·.
·
·
--~
~
fig.
5.
29
Current
limiter
117
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