Discussion
Match the remedy with the problem.
1. Interpole 2. Compensating winding 3. Carbon brush grade
P. Distortion under the pole face Q. Reactance voltage in the commutating coil R. Contact resistance to assist commutation
Answer: B
Correct answer: 1-Q, 2-P, 3-R
Three remedies for three distinct problems. The interpole induces an emf cancelling the reactance voltage in the coil being commutated. The compensating winding, in slots in the pole faces, cancels the armature’s distortion of the flux under the poles. And the brush grade supplies the contact resistance that assists the reversal.
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