Page 771 - Basic Electrical Engineering

winding were made, what would have been the induced EMFs. Assume the
distribution factor and the pitch factor as 0.96 and 0.98, respectively.

Solution:

If concentrated winding and full-pitch coils are used, the EMF induced will
be

E = 4.44 ϕf T V

But with distributed winding and use of short-pitch coils

E = 4.44 ϕf T K K V
p
d
with the given

This shows that due to the distribution of winding throughout the stator

periphery and use of short-pitch coils, the EMF induced has been reduced in
this case by 692 V. However, the use of distributed winding and short-pitch
coils improves the heat dissipation and wave shape of the voltage generated,

respectively.

Example 10.4 A three-phase 36-pole synchronous generator is rotated by a

water turbine at 167 rpm. The stator has 324 slots and each slot has 10
conductors. The flux per pole is 20 mWb. Calculate the EMF induced per
phase if full-pitch coils are used for the winding.

Solution:

Synchronous speed,