DC motor - Siemens, s.r.o.
DC motor - Siemens, s.r.o.
DC motor - Siemens, s.r.o.
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Overview of faults in operation<br />
↓ Motor generally running unevenly<br />
↓ Vibrating brushes<br />
↓ Considerable rise in temperature (general)<br />
↓ Significant brush sparking<br />
Possible causes of fault Remedial measures<br />
System fault<br />
X Coupled machine out of balance Check coupling, rebalance system<br />
X X Poor alignment Align machine set<br />
X X X System-related resonances Improve installation conditions or<br />
reduce excitation of vibrations<br />
Operating mode or operating fault<br />
X Continuous light load (part load) Change number and/or material of<br />
brushes<br />
Operation<br />
X Temporary overload Correct current limiting at converter<br />
X Continuous overload Correct current limiting at<br />
converter/shorten standstill time<br />
Cooling fault<br />
X Cooling-air rate too low (commutator<br />
temperature too high)<br />
Component fault<br />
Improve routing of cooling air<br />
X Interturn fault Repair winding<br />
X X Distorted commutator Rework commutator<br />
X Rotor out of balance Balance rotor<br />
X Bearing damage Repair or replace bearing<br />
[ID 565]<br />
5.6.3 Bearing faults<br />
Overview<br />
Note<br />
Damage to bearings is sometimes difficult to detect. If in doubt, it is recommended<br />
that the bearing should be replaced.<br />
Changes to the bearing design must only be made after consultation with the<br />
manufacturer.<br />
Table 5-3 Bearing faults<br />
Fault characteristics<br />
↓ Bearing too warm<br />
Overview - bearing faults<br />
SIEMENS AG T61160347010001 (DMHO V9)<br />
Operating instructions 1GG6286-0NA4.-1VV1-Z 5-5
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