(3
l AHemator construction
T
he
alternator enclosure is of
enclose.t.I
type. The
field
is.
s
ingle
coil moun led on Ih. shaft and sur-
rounded
by
two mu1ti·pole magnets; excita(ion
cumnl
is
su
pplied through slip ting' 10
the
co
il.
The annature
coils
at
e
in
three
gr
o
ups.
connected
to
provide a three.phase
armS
fUre
,
Md
ace
mount
-
ed
in
the laminilted core secured to
the
casing.
Thus,
th
e
an
n
atU
Je
is
stalionary and
the
field is
rota
ry
. The rotor shaft
is
driven from the engine
Ihrough the bell
and
puUey
•.
The three-phase o
utput
leads
of
the armature are
tied to the six·diode rectifier mounted inside the
casing:
duet
diodes are soldered
10
the positive
he
at
sink
and
the other three to the
negaUve
heat
sink.
Coo
U
tlg
is
made
by
the
fan
fram outside.
CONSTRUCTION
AND
FUNCTION
-,'
,
--_
44!·1
':
.
-.
'
t
t:~
-~
~
;-
"'.1
-f,'
:-
~
~~
.
:.
...
i~
-
.,
' .
,'
"<
:\
~
,',
" ..
Al
te
rn
a
tor
!!Om
1-Beoring
'2..Ra~r
btacket
3-$tilto
r
col
r
~·Ro
t
ar
&-
Fro
p.t
bracket
o.
F
an
7·
0iode
B·Pulley
9·Bearing
Alternator - Cro
ss
section
(4) Charging Sfstem operation
The
fi
rS
l
of
the two
ci
rcuit diagrams [0 follow
~hows.
h
ow
the current flows from the
battery
when
the
key
swi
tc
h
is
turned
on
fo
r starling
up
the engine.
The
second shows
the
flow of c
urrent
for cha
rgin
g
the
battery. In these diagrams, attell·
tion should be dir
..
ted to
vol
tag. ooils VC, and
VC,
Wld
current · coils
Cet
and
ee
2. the four
coils of
the
regulator unit.
VC,
and
CC,
actuale
pomts
P, ; VC, and
ce.
actuate points
P-::!
and P
J..
The energizing current
of
a voltage co
il
is
dependenl on voltage; that of a
current coil (which
is
connected as a sh
unt
coil)
is
depending on
current
.
In the
..
diagrams, the allernator unit
(not
shown)
L,
represented
by
its
three l
eoninal,
(A)
(F)
(
Nl
·
DC
outpuf voltage is a
va
ilable between terminal
(A)
and
ground.
Another
vollage occurs belween
41
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