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Torque angle λ is the angle between ____________

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Torque angle λ is the angle between ____________

(a) stator MMF Fs and resultant MMF FR

(b) stator MMF Fs and rotor MMF Fr

(c) rotor MMF Fr and resultant MMF FR

(d) any of the mentioned

I got this question in homework.

This interesting question is from Production of Torque in Non-Salient Pole Machines topic in portion Synchronous Machines of Electrical Machines

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Right answer is (b) stator MMF Fs and rotor MMF Fr

Explanation: The electrical space angle λ between stator and rotor MMFs is called the torque angle.

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