Hydraulic-Electric Analogies: DC Motors, Part 5 (.PDF Download)

The conventional dc motor consists of stationary pole pieces, a rotor coil comprised of one or more turns of a conductor, a series of commutator segments (two for each coil on the rotor), and a pair of brushes to link current from the outside stationary world to the motor interior’s rotating world. Commutator segments are typically made of copper and the brushes consist of graphite. Both are conductors, plus the graphite provides a solid lubricant between the copper and graphite leading to longer brush life...

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