Reworking the commutator after the formation of grooves
Moderate scoring or burn marks do not affect the operational reliability of the machine. The
commutator only needs to be overhauled if it is seriously scorched or grooved and/or is out-of-
round.
● Grind the commutator in the mounted position with a commutator grinder of medium grain
size, grain number 80 (210 - 177 μm).
● To do this, lift most of the brushes and operate the motor at a speed of approximately 600
rpm.
● Place the grinder on the brush holder.
Note
Suck or blow the dust out
Dust inside the motor can cause winding damage. Suck or blow the dust out.
● Remove the grinding dust with dry, oil-free compressed air. Deburr the edges of the
segments if necessary.
● Where the commutator is severely out-of-round, remove the rotor and skim the commutator
on a turning machine. You can skim the commutator down to the smallest permissible
diameter (d
min
) given in the following table.
Table 9-3 Commutator overhaul – minimum permissible diameter
Shaft height Nominal diameter d
N
(mm) Minimum diameter d
min
(mm)
1G.5 / 1H.5
500 560 546
630 720 706
1G.6 / 1H.6
160 160 154
180 190 184
200 210 202
225 240 232
250 265 257
280 300 292
1G.7 / 1H.7
355 350 340
400 350 340
450 400 390
Maintenance
9.1 Inspection and maintenance
SIMOTICS DC 1GG5
90 Operating Instructions 02/2016
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