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  Short Pitch Winding

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

1 + 23 =

24

2

24 - 21 =

3

3 + 23 =

26

1

26 - 21 =

5

5 + 23 =

28

2

28 - 21 =

7

7 + 23 =

30

3

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

1

4 + 48 - 23 =

29

29 - 48 + 21 =

2

2

2 + 48 - 23 =

27

27 + 21 =

48

3

48 - 23 =

25

 

Finish

 

 

Y Phase in terms of coil sides

4

Start

17

17 + 23 =

40

5

40 - 21 =

19

19 + 23 =

42

6

42 - 21 =

21

21 + 23 =

44

7

44 - 21 =

23

23 + 23 =

46

8

46 - 21 =

25

This coil side belongs to other phase.

Therefore coil side 46 is connected to coil side 22.

9

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

 

Finish

 

 

B Phase in terms of coil sides

1

Start

33

33 + 23 - 48 =

8

2

8 - 21 + 48 =

35

35 + 23 - 48 =

10

3

10 - 21 + 48 =

37

37 + 23 - 48 =

12

4

12 - 21 + 48 =

39

39 + 23 - 48 =

14

5

14 - 21 + 48 =

41

This coil side belongs to other phase.

Therefore coil side 41 is connected to coil side 38.

6

38 - 23 =

15

15 + 21 =

36

7

36 - 23 =

13

13 + 21 =

34

8

34 - 23 =

11

11 + 21 =

33

9

33 - 23 =

9

 

Finish

Fig. gives the main winding diagram for the 3 phase, 2 poles, and 24 slot machine ac machine.

2126_Short Pitch Winding Homework Help.jpg

Diagram - 3 phase double layer 2 poles 24 slot lap (short pitch) winding

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