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In resistance commutation method we add resistance between __________________

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In resistance commutation method we add resistance between __________________

(a) Brushes and external circuit

(b) Commutator and armature winding

(c) At field winding

(d) Commutator and brush

The question was posed to me in my homework.

Question is from Commutation Process -1 in chapter Commutation Process & Excitation Methods of DC Machines

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Correct answer is (d) Commutator and brush

The explanation: High contact resistance between commutator segments and brushes, achieved by using carbon brushes, adds resistance to the circuit of the commutating coil thereby reducing the time constant (L/R) of the current transient (ic(t)), helping it to change faster in the desired direction.

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