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If total ampere turns per pole is equal to 6000 A-turns, peak ampere turns for a 4-pole machine is _____

(a) 24000

(b) 3000

(c) 1500

(d) 4500

This question was posed to me in semester exam.

Query is from Armature Reaction in section Armature Reaction of DC Machines

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The correct option is (c) 1500

Easy explanation: Peak flux density in terms of total flux density is given by ATa (peak) = ATa (total) /P. Thus, for a 4-pole machine, ATa (total)= 6000 and P=4. Thus, Peak flux density is equal to 6000/4= 1500.

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