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  Double Layer Simplex Lap Winding

Introduction to Double Layer Simplex Lap Winding Diagram

Draw the winding diagram for a 2 pole, 6 slot simplex lap connected dc machine along with commutator comprising 6 segments. Point out the position of brushes.

Solution: Slots per pole = s/p = 6/2 = 3;

No. of coils, C = number of commutator segments=6

No. of coil sides = 2C = 12;

Hence, coil sides per slot = 12/6 = 2

According to the equation 2, the back pitch, Yb = 2C/P + K = (12/2) + K = 6 + 1 = 7 (odd integer)

According to the equation 3, the winding Pitch, Y = +2 for progressive winding (even integer). According to the equation 5, the front pitch, Yf = Yb - Y = 7 - 2 = 5 (odd integer). Starting with coil side 1 (back end side), back pitch is added to acquire the bottom layer coil side, that is, 8 (back end side). To the coil side 8 (front end side), front pitch is subtracted to acquire the top layer coil side, that is, 3 (front end connection). Proceeding in identical way, all the coil sides are connected and a winding table, as displayed in the Table below.

Table: Winding table for 2 poles, 6 slot simplex lap winding

S.No.

Top coil Side (-Yf)

Bottom coil Side (+Yb)

1

2

3

4

5

6

1

3

5

7

9

11

8

10

12

2

4

6

To represent the main winding diagram, first sketch 6 solid vertical lines (equivalent to no. of coils) of equivalent length and equivalent distance. Next, draw 6 dotted lines nearer to the solid lines of similar length and distance, as displayed in the diagram below.

Assign even numbers to the bottom layer coil sides of the dotted lines and odd numbers to the top layer coil sides of the solid lines.

Give the front end and back end connections with reference to the above table. After that, draw solid vertical lines (equivalent to no. of coils) from the top mid-point of each front end connections, as displayed in the diagram below.

Present commutator segments (equivalent to no. of coils) through rectangular boxes below the front end connections, as displayed in the diagram below.

Divide the armature slots (or coils) from the number of poles. This provides the allocation of coil sides to pole regions. In this instance, the no. of slots are 6 and no. of poles are 2. Thus, the North Pole, N region, covers first 3 coils (say 1 to 6) in the diagram below. The South Pole, S covers coil sides 7 to 12.

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