left on untaped coil after insertion, to help keep
wires from being displaced.
Wind stator coils using number of turns and wire
per winding data, figure 11-19.
Sleeve leads with flexible braided glass treated
Apply slot liner insulation 5-5-5 (item (C)) and coil
separator (item (B)) as shown in stator slot detail,
Make 14 pole series connections per winding
Insert slot wedge (item A)) in slot as shown in
Make high potential test. Test voltage to be 2000
volts per coil connected in series.
Bake stator as follows:
Vacuum impregnate until bubbling ceases.
Allow to drain.
Bake in 300°F (149°C) oven for 8 hours.
Type epoxy class F.
The wound stator should be examined for
complete coverage with not strings or beads, and
with openings between extended position of slot
tubes, blistering or peeling, and complete cure
with tack-free surfaces and good bonding
11-14. EXCITER ARMATURE. The exciter armature is
the rotor part of the brushless exciter that provides
excitation current for the generator. The exciter armature
and rotating rectifer assembly is mounted on the shaft of
the generator. The rotating rectifier has six diodes and a
surge protector mounted on heat sinks.
Inspect. Inspect the rotor as follows:
Inspect for loose, frayed, or burned
Inspect shaft for burrs or indications
Test. Disconnect leads from rotating diode
assembly before testing.
Growler Test. Perform a growler test
on the rotor as follows:
Place the rotor on the growler and
Hold a thin piece of metal, such as a
hacksaw blade, directly over the top
slot of the rotor and along the length
of the slot. If the coil is shorted the
blade will vibrate rapidly and cause a
If the above test is not within the
limits specified, proceed with the
Rotating Rectifier Test. Refer to paragraph 11-8b
and test the diodes and surge protector on the
rotating rectifier assembly.
Replacement. For removal and replacement of
the exciter rotor, refer to paragraph 11-6.
Replace or rebuild all defective parts.