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reverse polarity - Reversed universal universal motor sparks and shows arcing even though brushes are completely perpendicular to the commutator - Electrical Engineering Stack Exchange
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Sparking carbon brushes ~ Cleaning the armatures commutator bar on a circular saw - YouTube
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DC Shunt Motor with Brushes Sparking Case Study - Mawdsleys
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Motor carbon brush sparking. Why it happens and how can I fix it? | All About Circuits
