## How to calculate back pitch, front pitch, commentator pitch?, Electrical Engineering

Assignment Help:

Q. A 6 - pole, DC armature with 36 slots and 2 coil - slides/slot is to be wave wound (double layer). Calculate the back pitch, front - pitch and commentator pitch. How many dummy coils, if any are required?

Ans.

Given

C = 36

P = 6

C = P/2Yc ± 1

36 = 6/2 Yc ± 1

36 = 3Yc ± 1

Let                    Y = 12 then

C = 3 ×12-1

= 35

SO we choose C = 35 which actually 36 coils be accommodate

Yes = S/P = 36/6 = 6

YB = 2YCS + 1

YB = 2 × 6 + 1

YB = 13

YF = 2Y - YB = 2 ×12 - 13 = 11

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