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 + 23 =
24
2
24 - 21 =
3
3 + 23 =
26
26 - 21 =
5
5 + 23 =
28
28 - 21 =
7
7 + 23 =
30
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 + 48 - 23 =
29
29 - 48 + 21 =
2 + 48 - 23 =
27
27 + 21 =
48
48 - 23 =
25
Finish
Y Phase in terms of coil sides
17
17 + 23 =
40
40 - 21 =
19
19 + 23 =
42
6
42 - 21 =
21
21 + 23 =
44
44 - 21 =
23
23 + 23 =
46
8
46 - 21 =
Therefore coil side 46 is connected to coil side 22.
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
B Phase in terms of coil sides
33
33 + 23 - 48 =
8 - 21 + 48 =
35
35 + 23 - 48 =
10 - 21 + 48 =
37
37 + 23 - 48 =
12 - 21 + 48 =
39
39 + 23 - 48 =
14
14 - 21 + 48 =
Therefore coil side 41 is connected to coil side 38.
38 - 23 =
15
15 + 21 =
36
36 - 23 =
13
13 + 21 =
34
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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