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  Double Layer Lap Winding

Introduction to Double Layer Lap Windings:

Bbuild up the layout of a lap winding for a 3 phase ac machine comprising 4 pole and 24 slots. There are 2 coil sides per slot.

Solution: Coil groups per phase = 3 x 4 = 12

Slots per pole per phase, m =24/(3*4) = 2

Angle among the adjacent slots, â = 180/(24/4) = 300ε.

For full pitch coils, the coil span, á = 0, that is, angle among the two sides of similar coil is 1800e. 1800 corresponds to 180/â = 180/30= 6 slots.

Here 3 phase groups per pole, each having of 2 slots. The distribution of slots, of phase sequence RYB or ABC, is displayed in the below table.

Table: Polar Groups

Poles

N1

S1

N2

S2

Phase

R

B

Y

1,2

3,4

5,6

7,8

9,10

11,12

13,14

15,16

17,18

19,20

21,22

23,24

The start of the phases must be displaced through the 1200 and thus must be finishes. If the start of R or A phase lies in slot number 1, the start of Y or B phase must be in slot number.

 (1 + 120/30 =) 5

And that of B or C phase in slot number (5 + 120/30 =) 9.

This creates the phase sequence RYB or ABC.

The top coil side in slot number 1 is to be connected to bottom coil side in slot number (1 + 6 =) 7 or back pitch, Yb = 13, in terms of coil sides, that is, if slot number 1 is at the beginning of the first North Pole that is denoted by N1, the slot number 7 will be at the beginning of the first South Pole that is denoted by S1.

The winding pitch, Y = +2 (progressive winding).

The front pitch, Yf = Yb - Y = 13 - 2 = 11.

At present, coil sides 1 and 14 form a coil. Coil side 14 is linked to coil side (14 - Yf =) 3, and coil side 3 is linked to coil side (3 + Yb =) 16. Thus coil sides 3 and 16 form the second and the last coils of this pole phase groups.

The below table express the winding table for RYB Phases.

Table: Winding Table for RYB Phases

S.No.

Top coil side (-Y )

Bottom coil side (+Y)

R or A phase per pole per phase

1

2

3

4

5

6

7

8

1

3

13

15

25

27

37

39

14

16

26

28

38

40

2

4

Y or B phase per pole per phase

9

10

11

12

13

14

15

16

9

11

21

23

33

35

45

47

22

24

34

36

46

48

10

12

B or C phase per pole per phase

17

18

19

20

21

22

23

24

5

7

17

19

29

31

41

43

18

20

30

32

42

44

6

8

The diagram below explains the complete main winding diagram for 3 phase 4 pole 24 slots double layer lap winding.

Question: build up the layout of a lap winding for a 3 phase ac machine comprising 2 pole and 24 slots. There are 2 coil sides per slot.

Solution: Coil groups per phase = 3 x 2 = 6. Slots per pole per phase, m = 24/(3*2) = 4

Angle among the adjacent slots, â = 180/(24/2) = 150ε.

For full pitch coils, the coil span, á = 0, that is, angle among the two sides of similar coil is 1800e.

2212_Double Lap Layer Homework Help.jpg

Diagram - 3phase double layer lap winding

1800 corresponds to 180/ â = 180/15= 12 slots.

There are 3 phase groups per pole, each having of 4 slots. The distribution of slots, of

phase sequence RYB or ABC, is displayed in the table below.

Table: Polar Groups

Poles

 

North

 

South

Phase

R

1 - 4

13 - 16

B

5 - 8

17 - 20

Y

9 - 12

20 - 24

Begin of the phases must be displaced through the 1200 and thus have to be finishes. If the begin of R or A phase lies in slot number 1, the start of Y or B phase must be in slot number

 (1 + 120/15 =) 9 and that of B or C phase in slot no. (9 + 120/15 =) 17.

This creates the phase sequence RYB or ABC.

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