Specifications

38
12345678910111213141516
17
18 19 20 21 22 23 24
N1 S1 S2N2
19 20 21
22
23 2 3 4
5
6
Table 4.2 Single Phase AC Wave Winding Table
S.No. Y
f
Y
b
117
21319
328
41420
539
61521
7410
81622
9511
10 17 23
11 6 12
12 18 24
To draw the main winding diagram, solid lines of equal length and equal distance equal to
number of slots is drawn. Connect the coils as per the Winding Table 4.2.
Arbitrarily assume a particular current direction to the coil sides under the pole pairs. For
the coil sides under North Pole regions, assume downward current direction and vice versa for
the South Pole regions, as shown in Fig. 4.2.
Fig. 4.2 - Single phase AC Wave Main Winding Diagram
Spiral or Concentric Winding : Develop a single phase single layer concentric winding for a 4
pole AC Machine having 24 slots.
Solution : From equation 3.5, pole pitch = = 6
The pitch for larger coil = 6 – 1 = 5
The pitch for smallest coil = 1
Based on the rules, the winding is started from the starting end of the middle coil in the first
North Pole, ie., coil side 4. The back end of the coil side 4 is connected to the back end of the
slots
Poles
24
4
=