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An electromechanical energy conversion device has cylindrical stator but salient pole rotor. If δ is the angle between stator field and rotor field, the average torque developed is proportional to (A and B are constants) __________

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An electromechanical energy conversion device has cylindrical stator but salient pole rotor. If δ is the angle between stator field and rotor field, the average torque developed is proportional to (A and B are constants) __________

(a) Asinδ

(b) Asin2δ

(c) Asinδ+Bsin2δ

(d) δ

This question was posed to me in exam.

My question is taken from Elementary Synchronous Machines in portion Basic Concepts in Rotating Machines of Electrical Machines

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Right option is (c) Asinδ+Bsin2δ

Explanation: Te(av) = 1/8 Im^2(Ld-Lq)sin2δ+1/2 IfImMmaxsinδ = Asinδ+Bsin2δ.

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