What is the causes of sparking of motors?

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Sparking is another common problem on electric motors. Small sparks are yellow in appearance, whereas large sparks are white. White sparks are detrimental to good motor performance. Sparking can be caused by numerous conditions like motor overload, vibration, high humidity, worn brushes and worn commutators. When checking for sparking or arcing, a good visual inspection of the commutator and brushes will have to be performed.

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