Gramme Ring and Drum Wound Armature in DC Motors

A DC motor can be made using different types of armatures based on its application. There are 2 types of armatures.

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DC Generators

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Armature Reaction in Alternator

Types of Armature winding Drum winding - Lap winding - Wave winding

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File:Drum Wound Armature - Single Coil Example.jpg - Wikipedia