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When the coil is powered, a magnetic field is generated around the armature. The left side of the armature is pushed away from the left magnet and drawn towards the right, causing rotation. When the coil turns through 900, the brushes lose contact with the commutator and the current stops flowing through the coil. However the coil keeps turning because of its own momentum.
The efficiency of the DC Motor increases by:
DC - Motor Animation:
Principle of DC Motors - Video:
DC Motor - Presentation: