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In all rotating electrical machine, electrical torque is developed when relative speed between stator field and rotor field is ____________(a) zero(b) equal to rotor speed(c) equal and opposite to rotor speed(d) dependent upon the type of electrical machineThe question was asked by my college professor while I was bunking the class.This intriguing question originated from Production of Torque in Non-Salient Pole Machines topic in section Synchronous Machines of Electrical Machines

Answer»

Right choice is (a) zero

The explanation is: If the relative speed between stator FIELD and rotor field is not zero, then the load ANGLE δr varies with time.

From equation TE = -(Π/8)P^2ΦFrsinδr Nm, we can say that average torque over a COMPLETE CYCLE is zero, implies Te=0.



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