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The insulating material used between the commutator segments is normally _______

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The insulating material used between the commutator segments is normally _______

(a) Graphite

(b) Paper

(c) Air gap

(d) Mica

I had been asked this question in semester exam.

This is a very interesting question from Commutation Process topic in division Commutation Process & Excitation Methods of DC Machines

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The correct option is (d) Mica

To elaborate: s: Each conducting segment of the commutator is insulated from adjacent segments. Mica is a good electric insulator and good thermal conductor as well. Its applications in electric fields are derived from its unique mechanical properties. Thus, it allows mica to be ductile enough for its appropriate space of application.

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