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It depends on the type of sparking/arcing. If you mean in a DC or series-wound motor, it is caused by the making and breaking of the commutator segments against the motor brushes.

If you mean under a car, then it could mean that the muffler is dragging the ground.

If you mean in a CRT television, then it is likely problems with the flyback transformer.

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12y ago

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Sparking at the brushes of a universal motor can be caused by several factors, including worn or damaged brushes, improper brush alignment, or inadequate brush pressure against the commutator. Additionally, dirt or debris on the commutator surface can lead to poor electrical contact, resulting in arcing. Excessive load on the motor or improper voltage supply may also contribute to increased sparking. Regular maintenance and inspection can help mitigate these issues.


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