What is typically indicated by an increased brush wear in a DC motor?

Increased brush wear in a DC motor is often associated with issues related to the commutator's condition. When there is threading on the commutator, it creates an uneven surface for the brushes to make contact with, leading to accelerated wear. This uneven surface causes the brushes to experience friction and wear down more quickly than they normally would, resulting in the increased brush wear observed.

The commutator's role is crucial in maintaining the proper functioning of the motor. If its surface is damaged or has any irregularities, it can also lead to sparking and inefficient electrical contact, compounding the wear issue. Thus, when brush wear is observed to be excessive, it is important to check the commutator for such defects to ensure optimal motor performance and longevity.