Question

Peak value of fundamental component of MMF produced by one N-turn coil carrying a current ‘i’ is ____________

(a) 4/Π(Ni)

(b) 2/Π(Ni)

(c) 1/Π(Ni)

(d) 1/2Π(Ni)

I got this question in class test.

I would like to ask this question from MMF Produced by Distributed Windings topic in chapter Synchronous Machines of Electrical Machines

Answer 1

Correct choice is (b) 2/Π(Ni)

To explain I would say: The fundamental component of rectangular wave is found to be Fα1=(4/Π)(Ni/2)cosα, for 2-pole machine where α=electrical space angle

The peak value of the sine MMF wave for a 2 pole machine is given by F1p=(4/π)(Ni/2)AT’s per pole = 2/π(Ni) AT.