Interpoles are excited with ____________(a) Armature current(b) Field current(c) Separate supply(d) Mains currentI have been asked this question by my college professor while I was bunking the class.Question is taken from Commutation Process -1 in section Commutation Process & Excitation Methods of DC Machines

Interpoles are excited with ____________(a) Armature current(b) Field

1.	Interpoles are excited with ____________(a) Armature current(b) Field current(c) Separate supply(d) Mains currentI have been asked this question by my college professor while I was bunking the class.Question is taken from Commutation Process -1 in section Commutation Process & Excitation Methods of DC Machines
Answer» Correct OPTION is (a) Armature current The best I can explain: These interpoles apply a local CORRECTION to the air-gap flux density wave such that a pip of appropriate flux density EXISTS over the commutating coil to induce in it a voltage of the same sign as that of coil current after commutation. HENCE, they are excited with armature current.

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