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Cleaning a Vacuum Cleaner's Universal Motor Commutator to Reduce Sparks (and Stink!) « Adafruit Industries – Makers, hackers, artists, designers and engineers!
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Cleaning a Vacuum Cleaner's Universal Motor Commutator to Reduce Sparks (and Stink!) « Adafruit Industries – Makers, hackers, artists, designers and engineers!
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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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