Manual for Induction Motors and Generators
Maintenance - 61
3BFP 000 050 R0101 REV E
7.3.1.3 Stator and rotor
NOTE: It is not recommended that totally enclosed machines are dismantled and inspected
internally more often than every 3-5 years (L3).
7.3.1.4 Auxiliaries
Maintenance object L1 L2 L3 L4 Check / Test
Stator core V V V V / C Fixing, cracks, welds
Stator winding insulation V V / T V / T / C V / T / C Wear, cleanliness, insulation resistance, turn insulation test,
(high voltage test)
Stator coil over hangs V V V V Insulation damages
Stator coil supports V V V V Insulation damages
Stator slot wedges V V V V Movement, tightness
Stator terminal bars V V V V Fixing, insulation
Instrumentation V V V V Condition of cables and cable ties
Rotor winding insulation V V / T V / T / C V / T / C Wear, cleanliness, insulation resistance
Rotor balancing weights V V V V Movement
Shaft V V V V Crack, corrosion
Connections in rotor V V V / T V / T Fixing, general condition
Earthing brushes V V V V Operation and general condition
Maintenance object L1 L2 L3 L4 Check / Test
Pt-100 elements (stator,
cooling air, bearing)
V V / T V / T V / T Resistance
Anticondensation heaters V V / T V / T V / T Operation, insulation resistance
Encoders V V V / T V / T Operation, general condition, alignment
Auxiliary terminal boxes V V / T V / T V / T General condition, terminals, wiring condition
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