Spare Parts For Rotating Electrical Machines; General Spare Part Considerations; Periodical Part Replacements; Need Of Spare Parts - ABB AMA Series Manual

9.2 Spare parts for rotating electrical machines

9.2.1 General spare part considerations

9.2.2 Periodical part replacements

9.2.3 Need of spare parts

3BFP 000 050 R0101 REV E
• Fax:
• e-mail for spare parts:
• e-mail for site services:
• e-mail for warranties and
technical support:
NOTE: If available, please add the serial number of the machine (seven digits, starting with
45#####) to your e-mail for reference information.
The machines manufactured by ABB are designed and manufactured to provide reliable and
trouble-free operation for decades. This requires, however, that the machines are properly
maintained and operated. This maintenance includes changing of parts subjected to normal
wear.
There is always an inevitable amount of uncertainty related to wearing. The wear rates of these
parts vary greatly according to application, environment and particular conditions. Therefore,
the condition of these parts should be checked regularly and a sufficient amount of spare parts
should be kept in stock. These spares help to minimize down time if the need appears. The
extent of the stock should be decided based upon the importance of the application, the
availability of the particular spare part and the expertise of the local maintenance personnel.
There is always mechanical wear when two moving surfaces are in contact with each other. In
electrical machines most of the mechanical wear occurs between the rotating shaft and
stationary parts. The bearing parts such as rolling bearings, bearing shells and oil rings in sleeve
bearings will eventually wear out and need to be replaced, even if correct lubrication is
maintained. Other wearing parts include seals that are in constant contact with the rotating shaft
and brushes, brush gears and slip rings of the slip ring unit.
The parts mentioned above make an extensive, but not a complete, list of the mechanically
wearing parts. These parts have an estimated life span, but as mentioned earlier, their actual
durability can vary significantly. For this reason, at least these parts should be kept in stock. It
should also be noted that the replacement of these parts, due to normal wearing, is not covered
by the warranty.
Other types of wear occur due to elevated temperatures, electrical disturbances and chemical
reactions. The wear of the diodes in the rectifier bridge is usually related to abnormal electrical
operating conditions. It is usually a slow process, but it is strongly dependent on the operation
conditions of the machines and system disturbances.
Air filters, which protect the machine interior from contamination, become themselves saturated
with air impurities and need to be replaced to ensure the correct operation of the cooling unit,
and the continuous protection of sensitive machine parts.
Manual for Induction Motors and Generators
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After Sales Support and Spare Parts - 111