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How total number of brushes in a commutator are determined in a given DC machine?

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How total number of brushes in a commutator are determined in a given DC machine?

(a) Speed of armature

(b) Type of winding

(c) Voltage

(d) Amount of current to be collected

The question was posed to me in final exam.

The origin of the question is Brushes and Commutator Assembly topic in division DC Machines of DC Machines

1 Answer

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Best answer
The correct choice is (d) Amount of current to be collected

Easiest explanation: Brushes are in contact with rotating part and stationary part. Thus, if more amount of current is to be carried, it requires more number of brushes. Hence brush number depends directly on the amount of current that needs to be collected and fed up in or out.

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