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 TM 5-683/NAVFAC MO-116/AFJMAN 32-1083
Table 4-4 AC synchronous motor trouble-shooting-continued.
Maintenance
Probable Cause
Trouble
Fluctuating load.
Correct excessive torque peak at
Motor "hunts".
driven machines or consult motor
manufacturer.
If driven machine is a c o m p r e s s o r
check value operations.
Increase or decrease flywheel
size.
Try decreasing or increasing motor
field current.
Rotor not centered.
Realign and shim stator or
Stator
overheats
in
spots.
C onnections
and correct.
Open phase.
Check
improper
Unbalanced currents.
Loose connections:
tions.
internal connec
Short circuit in a
Replace or repair.
Field overheats.
field coil.
Excessive field
Redutce excitation until
field
current is at nameplate value.
current.
Reduce load or increase motor
Overload
All parts overheat.
size.
Check friction end belt tension or
aligment.
Over or under
Adjust excitation to nameplate
excitation.
rating.
Check circuit and exciter.
field excitation.
NO
Improper
voltage.
See that nameplate voltage is
applied.
Improper ventilatiion.
Remove any obstruction and clean
out
dirt.
Excessive room
Supply cooler air.
temperature.
4-35
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