Correct Answer - Option 3 : Noise and vibration inspections
Maintenance Guide Summary: To determine the maintenance requirements of a specific motor, the maintenance technician should refer to the manufacturer’s technical documentation prior to performing maintenance.
This guide is divided into the following sub-sections:
- Reviewing the Service History
- Noise and Vibration Inspections
- Visual Inspection
- Windings Tests
- Brush and Commutator Maintenance
- Bearings and Lubrication
Noise and Vibration Inspections:
- Prior to disconnecting the motor and sending it to the shop or a repair facility for maintenance, a noise and vibration inspection should be conducted.
- This requires the motor to be connected to its driven load, energized, and operated normally.
- The existence of mechanical noises or vibrations can indicate a variety of problems, such as mechanical and/or electrical imbalances, misalignments, brush chattering, bad bearings, bent shafts, mechanically loose windings (shaken lose by excessive vibrations, for instance), or simply a loose cooling fan or something stuck inside the vents or shroud.
- If the windings are loose, after it is disassembled, check for insulation and lead damage
