4 Major Troubles in a DC Motor with Reasons

DC motor fault zone analysis is a vital plan of any DC motor maintenance program. Several troubles may arise in a DC motor. A few of them are discussed below:

Failure to start
Sparking at brushes
Vibrations and pounding noises
Overheating of DC Motor

Table of Contents

Reasons for Failure to start

Failure to start may be due to the following reasons

ground fault
open or short-circuit fault
wrong connections
too low supply voltage
frozen bearing
excessive load.

Read: Working Principle of DC Motor

Reasons for Sparking at brushes

Sparking at brushes in a dc motor may be due to

troubles in brushes
troubles in commutator
troubles in armature
excessive load.

Brush troubles may arise due to the insufficient contact surface, too short brush, too little spring tension or wrong brush setting.

Commutator troubles may be due to dirt on the commutator, high mica, rough surface or eccentricity.

Armature troubles may be due to an open armature coil. An open armature coil will cause sparking each time the open coil passes the brush. The location of this open coil is noticeable by a burnt line between segments connecting the coil.

Read: Armature Reaction in DC Motor