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  Spiral or Concentric Winding

Introduction to Spiral or Concentric Winding:

Build up a single phase single layer concentric winding for a 4 pole AC Machine comprising 24 slots.

Solution: From equation 5, pole pitch = slots/ poles = 24/4=6.

The pitch for larger coil = 6 - 1 = 5

The pitch for smallest coil = 1

Relies on the rules, the winding is begin from the starting end of the middle coil in the first North Pole, that is, coil side 4. The back end of the coil side 4 is linked to the back end of the coil side 9, that is, pitch for larger coil is added to coil side 4. The front end of the coil side 9 is linked to front side of coil side 5 to form concentric winding. Following the above described process, the below table provides the complete winding table for 4 pole 24 slot AC Machine.

Table: Single Phase Concentric Winding Table

S.No

Front End Coil Side

Back End Coil side

1

2

3

4

5

6

7

8

9

10

11

12

4

9 - 4 = 5

8 - 2 = 6

7 + 6 = 13

12 + 2 = 14

11 + 4 = 15

10 + 6 = 16

21 - 4 = 17

20 - 2 = 18

19 + 6 = 1

24 + 2 = 2

23 + 4 = 3

4 + 5 = 9

5 + 3 = 8

6 + 1 = 7

13 - 1 = 12

14 - 3 = 11

15 - 5 = 10

16 + 5 = 21

17 + 3 = 20

18 + 1 = 19

25 - 1 = 24

26 - 3 = 23

27 - 5 = 22

Draw 24 solid lines of equivalent length at equal distance. This presents the number of slots.

This as well presents the number of coils, like this is a single layer winding. After that assign the numbers to the top side of the coils, as displayed in the below diagram. Along with the below table complete the winding diagram.

1272_Spiral or Concentric Winding Homework Help.jpg

Diagram - Single Phase AC Concentric Main Winding Diagram

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