#### Short Pitch Winding

Introduction to Short Pitch Winding:

It is supposed that the winding is short pitched through 1 slot.

Hence, coil span = 11, in terms of slots, or Yb = 23 in terms of coil sides.

The winding pitch, Y = +2 (progressive winding).

The front pitch, Yf = Yb - Y = 23 - 2 = 21 in terms of coil sides.

The below table explains the winding table for RYB or ABC Phase, in terms of coil sides.

Table: Winding Table for RYB Phases in terms of coil sides

 S.No. R Phase in terms of coil sides 1 Start 1 1 + 23 = 24 2 24 - 21 = 3 3 + 23 = 26 1 26 - 21 = 5 5 + 23 = 28 2 28 - 21 = 7 7 + 23 = 30 3 30 - 21 = 9 This coil side belongs to other phase. Therefore coil side 30 is connected to coil side 6. 4 6 + 48 - 23 = 31 31 - 48 + 21 = 4 1 4 + 48 - 23 = 29 29 - 48 + 21 = 2 2 2 + 48 - 23 = 27 27 + 21 = 48 3 48 - 23 = 25 Finish Y Phase in terms of coil sides 4 Start 17 17 + 23 = 40 5 40 - 21 = 19 19 + 23 = 42 6 42 - 21 = 21 21 + 23 = 44 7 44 - 21 = 23 23 + 23 = 46 8 46 - 21 = 25 This coil side belongs to other phase. Therefore coil side 46 is connected to coil side 22. 9 22 + 48 - 23 = 47 47 - 48 + 21 = 20 10 20 + 48 - 23 = 45 45 - 48 + 21 = 18 11 18 + 48 - 23 = 43 43 - 48 + 21 = 16 12 16 + 48 - 23 = 41 Finish B Phase in terms of coil sides 1 Start 33 33 + 23 - 48 = 8 2 8 - 21 + 48 = 35 35 + 23 - 48 = 10 3 10 - 21 + 48 = 37 37 + 23 - 48 = 12 4 12 - 21 + 48 = 39 39 + 23 - 48 = 14 5 14 - 21 + 48 = 41 This coil side belongs to other phase. Therefore coil side 41 is connected to coil side 38. 6 38 - 23 = 15 15 + 21 = 36 7 36 - 23 = 13 13 + 21 = 34 8 34 - 23 = 11 11 + 21 = 33 9 33 - 23 = 9 Finish

Fig. gives the main winding diagram for the 3 phase, 2 poles, and 24 slot machine ac machine.

Diagram - 3 phase double layer 2 poles 24 slot lap (short pitch) winding

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