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What is the formula of the pole arc of the universal commutator motor?(a) pole arc = ratio of armature axial length to armature diameter * pole pitch(b) pole arc = ratio of armature axial length to armature diameter + pole pitch(c) pole arc = ratio of armature axial length to armature diameter – pole pitch(d) pole arc = ratio of armature axial length to armature diameter / pole pitchThis question was posed to me in examination.I want to ask this question from Design of Small Universal Commutator Motors topic in chapter Design of Small Electrical Machines, Starters and Field Regulators of Design of Electrical Machines

Answer»

Right choice is (b) pole ARC = RATIO of armature axial LENGTH to armature diameter + pole pitch

Explanation: Firstly the ratio of armature axial length to armature diameter is calculated. NEXT, the pole pitch is calculated and on addition of both the TERMS the pole arc is obtained.



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