The brushes do make contact with the commutator on a DC motor which is usually pressed onto the armature shaft. The run in is not necessarily for alignment purposes but to make sure the brushes are correctly seated against the commutator. If the brushes are not seated correctly, arcing will...
Yes, you are on the right track with the capacitators weakening. This will cause all sorts of faults, especially in a unit that has been continuously ran for 15 years without a recondition.
I have also seen problems with power quality affecting the operation of VFD's. You can install a line...
1. Encoder alignment is critical and can cause many problems including over temp if it is not set correctly. Check out this article to find out more about issues with encoders; it might help you understand issues with encoders more.
2. Was the windings mapped so it could be rewound with the...
DC motors do not run on VFD's; they run on direct current. The voltage and speed can be adjusted and vary. You may be thinking of an AC motor if it runs on VFD?
Jade York,
www.repairzone.com
