Question

the purpose of brush in a dc machine​

Answer 1

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The primary function of carbon brushes is to deliver or collect current from a rotating part of an electric machine. The brushes should maintain a close contact with rotating part (commutator or slip rings) in order to ensure sparkles operation without wearing itself too quickly

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Answer 2

Answer:

The brushes in a DC motor have two purposes. They carry current to the armature (the rotating part). The brushes work with the commutator to switch the current to the proper winding of the armature as it rotates. This creates the correct magnet fields to make the motor run.

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