The torque equation for non salient pole machine is Te = -(P/2)(μoΠrl/g)(FsFr)sinλNm. What does the negative sign in the torque expression indicates?(a) stator and rotor MMF tend to reduce angle λ(b) stator and rotor MMF tend to increase angle λ(c) stator tend to reduce the air gap g(d) rotor tend to reduce the air gap gThe question was posed to me during an interview.The query is from Production of Torque in Non-Salient Pole Machines in chapter Synchronous Machines of Electrical Machines

The torque equation for non salient pole machine is Te = -(P/2)(μoΠr

1.	The torque equation for non salient pole machine is Te = -(P/2)(μoΠrl/g)(FsFr)sinλNm. What does the negative sign in the torque expression indicates?(a) stator and rotor MMF tend to reduce angle λ(b) stator and rotor MMF tend to increase angle λ(c) stator tend to reduce the air gap g(d) rotor tend to reduce the air gap gThe question was posed to me during an interview.The query is from Production of Torque in Non-Salient Pole Machines in chapter Synchronous Machines of Electrical Machines
Answer» The correct OPTION is (a) STATOR and rotor MMF tend to REDUCE angle λ The best I can EXPLAIN: The torque acts in such a direction as to align the two MMFs Fs and FR and thereby reduce the angle λ between them.

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