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
R Phase in terms of coil sides
1 + 23 =
24 - 21 =
3 + 23 =
26 - 21 =
5 + 23 =
28 - 21 =
7 + 23 =
30 - 21 =
This coil side belongs to other phase.
Therefore coil side 30 is connected to coil side 6.
6 + 48 - 23 =
31 - 48 + 21 =
4 + 48 - 23 =
29 - 48 + 21 =
2 + 48 - 23 =
27 + 21 =
48 - 23 =
Y Phase in terms of coil sides
17 + 23 =
40 - 21 =
19 + 23 =
42 - 21 =
21 + 23 =
44 - 21 =
23 + 23 =
46 - 21 =
Therefore coil side 46 is connected to coil side 22.
22 + 48 - 23 =
47 - 48 + 21 =
20 + 48 - 23 =
45 - 48 + 21 =
18 + 48 - 23 =
43 - 48 + 21 =
16 + 48 - 23 =
B Phase in terms of coil sides
33 + 23 - 48 =
8 - 21 + 48 =
35 + 23 - 48 =
10 - 21 + 48 =
37 + 23 - 48 =
12 - 21 + 48 =
39 + 23 - 48 =
14 - 21 + 48 =
This coil side belongs to other phase.
Therefore coil side 41 is connected to coil side 38.
38 - 23 =
15 + 21 =
36 - 23 =
13 + 21 =
34 - 23 =
11 + 21 =
33 - 23 =
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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