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13-18
PART
13-3
LUCAS
ALTERNATOR
Section
Page
Section
Page
1 Description and Operation ................
13-18
3 Major Repair Operations .................
13-20
2 Removal and Installation .................
13-20
LUCAS AlTERNATOR
Two types of Lucas alternators
are used on XA/ZF vehicles. They
are the 14 AC-6D model with a
remote 9 ATR voltage regulator and
14 ACR-4D and 6D models with an
integral 13 ATR voltage regulator.
With the exception of the position-
ing of the voltage regulator the two
types of alternator are basically the
same and the following description,
0
DESCRIPTION AND OPERATION
The stator comprises a 36 slot
3-phase star connected output wind-
ing on a ring shaped lamination pack,
housed between the slip ring end and
drive end brackets. The rotor is of 12
pole construction and carries a slip
ring fed rotor (field) winding. It is
supported by ball bearings in the
drive end slip ring end heads.
The brush gear for the field system
is mounted on the slip ring end
bracket. Two carbon brushes bear
against a pair of copper slip rings
which encircle the rotor shaft.
Rectification of alternator output
is achieved by six silicon diodes
contained within the slip ring end
bracket and connected in a three
phase bridge circuit between stator
and output terminals. A second recti-
fier bridge is formed by using three
auxiliary low current diodes in con-
FIG. 24- lucas Charging Circuit 14 ACR Shown
operation and repair procedures apply
to both except as noted.
The 14 ACR-4D
and
6D models
vary only in
their
rated output being
40 and 55 amps respectively.
junction with three of the six main
diodes and at normal operating speeds
this supplies the energy for the alter-
nator field coil via the slip rings,
brushes and voltage regulator.
The diodes and stator windings are
cooled by airflow through the alter-
nator induced by a ventilating fan
mounted on the rotor shaft at the
drive end.
An electronic voltage regulator is
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