Question

Q12 List any four examples of maintenance work done on motors.

Answer 1

- Generally, there are four types of maintenance theories. They ore 14 -a) Preventive maintenowe P b) corrective maintenance an d c) Risk based maintenance the best c) Conditon based maintenance - Protective maintenance includes changing of oil, greasing, tightening of beet, Changing of filters also called as Corrective maintenance restorative maintenance, includes reparing of various parts. It arises after a fault being carried out The following steps are to be checked for a motor. 1. Check brushes and replace any that are more than half worn 2. Examine brush holders, and clean them if dirty.

3. clean motor thoroughly, blowing out dirt from windings, and wipe commutator and brushes 4. Cheek grease in base or rover bearings 5. Examine connections between! Commutator and armature coils is dit net 6. Test insulation by megohmmeter 7. Clean out magnetic dirt that may be clinging to poles.