Figure 6-34. Stator
6-8. STAT0 R
6-8.1. General. The stator (Figure 6-34) consists of a series
of coils of wire laid in a laminated steel frame. The stator
leads (see Generator Wiring Diagram) supply voltage to the
AC load and exciter / voltage regulator.
6-8.2. Testing. The stator should have 0.25 ohms resistance
across each winding. To test, connect an ohmmeter between
leads 1 and 2, 3 and 4, and then 33 and 44. The leads are
tagged with the lead number,
6-9. ROTOR
The function of the rotor is to create a magnetic field. The
3.5kW has a rotor with two electromagnetic field poles
(Figure 6-35). The +5kW, 55kW, 7kW and 7.5kW each
have a rotor with four electromagnetic field poles (Figure
6-36). Rotor resistance readings are given in Table 6-1.
Measure resistance (ohms) between the two slip rings.
c
s
l
MODEL
RESISTANCE
3.5KW 9 to 11 ohms
4.5KW 8 to 10 ohms
5.5KW 8 to 10 ohms
7KW 8 to 10 ohms.
Table 6-l. Rotor Resistance
6-10. SEPARATE FIELD EXCITATION
As a preliminary aid to troubleshooting, the generator field
(rotor) may be excited (magnetized) using an outside power
source and the following procedure:
1. Disconnect brush leads from voltage regulator.
Figure 6-35. Two Pole Rotor
.:
Figure 6-36. Four Pole Rotor
A
WARNING
DANGEROUS ACID! Avoid contact with battery electro-
lyte. It contains acid which can eat holes in clothing, burn
skin, and cause permanent damage to eyes. Always wear
splash-proof safety goggles when working around the
battery. If battery electrolyte is splashed in the eyes or on
skin, immediately flush the affected area for 15 minutes
with large quantities of clean water. In the case of eye
contact, seek immediate medical aid. Never add acid to a
battery once the battery has been placed in service. Doing
so may result in dangerous spattering of electrolyte.
A
WARNING
EXPLOSIVE BATTERY GASES! The gases generated by a
battery being charged are highly explosive. Do not smoke
or permit flame or spark to occur near a battery at any
time, particularly when it is being charged. Avoid contact-
ing terminals with tools, etc., to prevent burns and to
prevent sparks that could cause an explosion. Remove
wristwatch, rings, and any other jewelry before handling
battery. Any compartment containing batteries should be
well ventilated to prevent accumulation of explosive gases.
To avoid sparks, do not disturb battery charger connec-
tions while battery is being charged and always turn
charger off before disconnecting battery connections.
Turn automotive test equipment off when connecting or
removing battery clips. When removing or reconnecting
battery cables, make sure ignition switch and all acces-
sories are turned off.
6-11
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