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GROUP 32
ALTERNATOR
DESCRI PTION
Fig. 3-2.
Exp loded
view
of
alternator
1. Brush holder
2. Insulation diodes with holder
3.
Slip ring end shield
4.
Rectifier (silicon diodes)
The alternator is a three-phase, delta-connected alter-
nator unit which is located on the right-hand side of
the engine and is driven by a V-belt from a pulley on
the crankshaft.
The alternator has a rectifier built into the slip ring
end shield. This rectifierconsists of six silicon diodes.
B+
D-
D
F_I
.
-;-
.
_~
I
+
I
I
.
4
.
I
I
L. ___
4
.
_._.~
Fig.
3-3.
Alternator
inner
circuit
VO
LVO
104
374
1. Stator
4.
Rectifier dioc;les
2. Rotor (field winding)
5.
Insulation diodes
3.
Slip ring and brush holder
3:2
5. Stator
6. Rotor
7.
Drive end shield
8. Fan
The alternator has a rotating field (rotor) and statio-
nary generating windings (stator).
The rotor is of the claw-pole type with the field wind-
ings fed over :the slip rings. The construction of the
rotor has made it possible for the alternator to have
a max. speed of 15000 r.p.m.
The insulation diodes (2, Fig. 3-2), which are placed on
the outside of the alternator, have
,
t wo functions: They
prevent the battery from discharging through the regu-
lator and
all
t ernator field, and they provide a simple
means of operating the charging warning lamp.
The alternator is
self-limiting
(max. 55 amps.) and for
this
reason
a
simple
voltage regulator can be used
with only voltage controI.
50
40
30
20
10
o
o
--
j . - -
14
VOLT
/
/
/
J
/
/
7
7
/
II
1000
2000
3000
4000
5000
6000
7000
aooo
RPM
Fig.
3-4, Alternator output
curve
VOLVO
10437"
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