Question

What is the formula to reduce flux pulsations?

(a) armature slot/number of poles = integer

(b) armature slot/number of poles = integer + 0.5

(c) armature slot/number of poles = integer – 0.5

(d) armature slot/number of poles = integer +-0.5

This question was posed to me in class test.

The above asked question is from Design of Armature topic in division Thermal Design Aspects of Electrical Machines & D.C of Design of Electrical Machines

Answer 1

The correct answer is (d) armature slot/number of poles = integer +-0.5

To explain I would say: First the number of armature slots is calculated. Then the ratio of the number of armature slots to the number of poles is approximately equal to integer+-0.5.