When visually inspecting the rotor, the field windings should be inspected for discoloration.
Rotor inspections can detect faults at an early stage and repairs can prevent unplanned outages. That is why rotor inspections are an essential part, but along with that, inspecting field windings is necessary also for discoloration because,
A field winding is a insulated current carrying coil on a magnet that produce the magnetic field intensity required to set up the electrical excitation in a generator or motor. As each coil gets excited in turn, the rotor aligns itself with the magnetic field produced by the excited field winding.
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