Question

function of commutator

Answer 1

hey
here is ur answer
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➡There are a number of reasons, including: 
1. Carbon is self-lubricating. 
2. Carbon has a negative temperature coefficient of resistance, which means that its resistance falls as its temperature increases -which is opposite that of metals such as copper. 
3. Carbon is softer than copper, so will not damage the commutator. 
4. Carbon will acquire the shape of the commutator segments and, so, will ensure maximum contact with them.
➡Function of commutator: To keep the torque on a DC motor from reversing every time the coil moves through the plane perpendicular to the magnetic field, a split-ring device called a commutator is used to reverse the current at that point.
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I hope this will help
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