4-6. CHECKING ROTOR
1) Remove the brush holder and measure
resistance between the slip rings.
Check here the table (Fig 5-1)
If the circuit tester is not sufficiently accurate, it may not show the values given and may give
erroneous readings.
Erroneous reading will also occur when there is a wide variation of resistance among coil
windings or when measurement is performed at ambient temperatures different from 20°C
(68°F).
2) Cleaning Slip rings the slip ring surfaces
must be uniformly bright.
Slip rings showing black spots, excessive
wear, or uneven wear must be repaired.
A stained slip ring lowers generator efficiency
and output voltage.
Polish the slip rings with fine sandpaper while
turning the rotor until rough spots disappear.
Care should be taken not to touch the rotor
coils with the sandpaper.
CIRCUIT TESTER
(Resistance)
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