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Describes how electromagnets are formed and factors affecting their strength.
Details the reversal of current in armature conductors for proper commutation.
Discusses motor torque dependence on current and the counter-electromotive force.
Details the brush assembly components and requirements for proper brush-to-commutator contact.
Explains the commutator's construction, function as a reversing switch, and mica plate undercutting.
Discusses the importance of a proper commutator film and signs of a satisfactory surface.
Illustrates and explains common commutator problems like streaking, threading, grooving, and copper drag.
Covers issues like flashovers, overheating, and burns on commutator bars due to various causes.
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