why we use only carbon brush in motor?
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Carbon brushes are used to make contact of a stationary wire with rotating rotor. Most common use is with DC motor. ... The brushes are made of carbon because carbon is a reasonably good conductor of electricity and it is soft, so it makes good contact. However the brushes wear out and have to be replaced periodically.
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A carbon brush is use to sliding contact use to transmit electric current from stic to the rotating part in a motor or a generator and as regards DC machines insuring a spark free commutation. Five brush grade families use brush manufacturing
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