Synchronous Machines : EMF Polygon – 1

The belt factor is defined as the ratio of

A fraction pitch winding is used to reduce
(i) amount of copper in the winding
(ii) size of the machine
(iii) harmonics in the generated EMF
(iv) cost of the machine
From these, the correct answer is

1. The angular slot pitch, γ is given by

The pitch factor, in rotating electrical machinery, is defined as the ratio of resultant EMF of a

If a stator has 48 slots, 6 poles and 3 phase with narrow spread winding, then the third harmonic belt factor is _______

The armature winding of a 2-pole, 3-phase alternator for each phase is distributed in a number of slots per phase. The RMS value of the voltage per phase is less than the RMS value of the voltage per coil multiplied by the number of coils in series because the

A 3-phase machine has integral slot winding with fundamental distribution factor k_d1, the distribution factor for nth harmonic k_dn is ____________

What is the coil span for a 2 pole 18 slot machine?

Consider the following statements regarding the design of distributed armature winding in a 3-phase alternator:
(i) it reduces the phase-belt harmonics
(ii) it increases the utilization of the armature iron and copper
(iii) it increases rigidity and mechanical strength of the winding
(iv) it reduces copper in the overhang of the winding
Which of these statements are correct?

In a machine with coil span 9, if a coil has its one coil-side in slot 1, then its other coil-side must be in ____________