Engineering How to find short pitch and pole pairs of motors

[kenok1216]

Homework Statement

Homework Equations

p=n_sf
δ=mϒ
K_d=[sin(δ/2)]/msin(γ/2)
K_p=cosε/2
e.m.f=4.44TφfK_dK_p

The Attempt at a Solution

i do not know why pole pair =2 and it is short 2 pitch.
how can i find pole pair and short pitch from its original developed diagram?
i know that Phase spread=60(we choose)
So for narrow spread ,the pattern is A-CB-AC-B
for m=2 for each phase it have 2 slot.

 

[jim hardy]

have you looked up definitions of the terms ? One always starts with vocabulary .

these look helpful
http://www.davidsonsales.com/docs_pdf/CoilPitch.pdf
https://en.wikipedia.org/wiki/Winding_factor
found them with search on "coil pitch"