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8-5 ROTOR
8-5-l MEASURE RESISTANCE IN THE
FIELD COIL OF THE ROTOR WITH
A CIRCUIT TESTER
Resistance
El
value
10.7J-z
Note 1: Measure the coil resistance between
the two slip rings.
Note 2: Sometimes the measured values do
not match the values shown in the
table above because of errors by the
circuit tester, unevenness of the coil
windings, or peripheral temperatuer.
8-5-2 CLEANING OF SLIP RING
When the surface of the slip ring is smooth it
is normal.
When it is dirty or abraded, it
should be repaired.
When the slip ring is dirty efficiency of the
generator may become lower and sufficient
voltage and output can not be obtained. In
this case, sand around the slip ring with fine
sandpaper.
Note:
When sandpaper is used, be careful not
to damage the coils of the rotor.
Stlip
Slip Ring
F&T 8-S 1
Fig. 8-5-2
8-6 BRUSH
If the surface of the brush contacting the slip
ring is smooth, it is normal. If not, make it
smooth with sandpaper.
Unless the surface is smooth, an arc may be
generated between the brush and the slip ring,
which may damage the brush and the slip ring.
The brush length should be, as shown in Fig. 8-
6, within the range from 1.5 mm to 5 mm. If
it is below 5 mm, it should be exchanged with
a proper one. When contact voltage between
the brush and the slip ring becomes lower,
efficiency of the generator also becomes
lower and sufficient voltage and output can
not be obtained.
5mm-5mm
Fig. 8-6
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