FIG. D.l/8 DIODE HOLDER UNIT
a.
Diodes; b. B + terminal; 12. Diode holder
ALTERNATOR SPECIFICATIONS
-Rated
voltage
.........................
12V
-Cut-in
speed at
14V
...............
950 r.p.m.
-Current
output delivered to battery at
14V,
3000 r.p.m. and stabilized conditions
.....
30A
-Max.
current•
.........................
36A
-Max.
continuous speed
..........
8500 r.p.m.
-Overspeed
....................
10000 r.p.m.
-Induction
coil resistance at
20
oc.
between
both slip rings
.....................
4.7
ohm
-Rotation
.................
Counterclockwise
-Engine/alternator
speed ratio
..........
1:1.82
*This data applies for alternators with properly
contacting brushes.
ALTERNATOR OPERATION
When the
coil
of
the rotor is energized a
magnetic field
is
created by rotation;
it
passes
across the stator winding and thus generates a
3-phase alternating current In the field windings.
This current Is rectified through the bridge rec-
tifiers. The rectified current reaches the alter-
nator B positive terminal.
The
exciting
coil
is
supplied from the battery by
means
of
the voltage regulator and a
switch
which
is
Included in the
lighting
and starting
switch
(see, Fig.
0.111).
As for the generator, the voltage
of
the current
which is generated by the alternator, is regulated
by varying the current in the
excitor
field
of
the
rotor winding. This is done through the dual
stage type voltage regulator, being provided with
two
pairs
of
contacts, which vibrate.
There
is
an indicator light in the instrument
panel
to
signal failure
of
the alternator. This light
is energized through the warning light relay.
Electrical System •
191
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