Specifications

69
Starting with top layer of coil side 1 (back end side), back pitch is added to obtain the bottom
layer coil side, ie., 6 (back end side). To the coil side 11 (front end side), front pitch is added to
obtain the top layer coil side, ie., 4 (16-12) (front end connection). Proceeding in similar way, all
the coil sides are connected and Table 5.3 gives the winding table for 2 pole 6 slot simplex wave
winding.
Table 5.3 : Winding table for 2 pole, 6 slot simplex wave winding
S.No.
Top coil Side
(+Y
f
)
Bottom coil Side
(+Y
b
)
11 8
211 4
39 2
47 12
55 10
63 8
To draw the main winding diagram, first draw 8 solid vertical lines (equal to no. of coils) of
equal length and equal distance. Next, draw 8 dotted lines nearer to the solid lines of same
length and distance, as shown in Fig. 5.6.
Assign odd numbers to the top layer coil sides of the solid lines and even numbers to the
bottom layer coil sides of the dotted lines.
Give the back end and front end connections with reference to the Table 5.3. Divide the
armature slots (or coils) by the number of poles. This gives the allocation of coil sides to pole
regions. In this example, the number of slots are 6 and number of poles are 2. So, the north
pole, N region, covers first 3 coils (say 1 to 6) in Fig. 5.6. The south pole, S covers coil sides 7
to 12.
Find the current direction by applying Fleming’s right hand rule, when the mode of operation
is a generator and Fleming’s left hand rule, when the mode of operation is a motor. Or the
current direction to all coil sides can be arbitrarily assumed. Mark downward current direction
for the coil sides under the north pole regions and upward current direction under south pole
regions, as shown in Fig. 5.6.
Fig. 5.6 - Main winding diagram for 2 pole 6 slot simplex wave machine
1
3
5
7119
24 6
8
12
10
123456
+ -
AAA
Front end
coil sides
Commutator
segments
Back end
coil sides
N
S
2
4
31
5
9
11
810
12