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The reluctance offered to the stator flux by two very large air gaps in series with high permeability iron, in reluctance machine is maximum, when the space angle θr = ___________

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The reluctance offered to the stator flux by two very large air gaps in series with high permeability iron, in reluctance machine is maximum, when the space angle θr = ___________

(a) 0°

(b) 45°

(c) 90°

(d) 180°

I had been asked this question by my college professor while I was bunking the class.

My question comes from Reluctance Motor in portion Basic Concepts in Rotating Machines of Electrical Machines

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The correct choice is (c) 90°

Easiest explanation: Only when θr = 90°, the long rotor axis is perpendicular to the stator d-axis, and thus reluctance is maximum.

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