in this PPT I Gave Information To ac Concentric winding And its placing . and i gave solve example and calcution of concentric winding.

1. Electrical Elements Design (2150904)
Active Learning Assignment
on
Concentric Windings
Prepared By:
Patel RajalKumar H.
(160123109013)
Guided By :
Prof. Purv Mistry
Electrical Department
Batch-B3Gandhinagar Institute of Technology1

2. Introduction
Gandhinagar Institute of Technology2
• Three-phase concentric winding consists of coil groups laid in
the slots so that all the coils of each group are concentric.
• That is, the coil with the smallest slot pitch is surrounding by
the coil with the next larger slot pitch and so on to make up a
coil group.
• Each coil consists of several turns and the cross-over from one
coil to the next is indicated by a short slanted line (jumper).

3. AC Armature
Windings
Single layer
winding
Double layer
winding
Concentric
winding
Mush
winding
Lap
winding
Wave
winding
Hemitro
-pic
Whole
coil
winding
Integral
slot
Fraction
-al slot
Integral
slot
Fraction
-al slot
Types of AC armature winding
Gandhinagar Institute of Technology3

4. Concentrated armature winding
• Concentrated winding is employed where number of slots
on the armature is equal to number of poles in the machine.
• This armature winding of alternator gives maximum output
voltage but not exactly sinusoidal.
• Here, number poles = number of slots = number of coil sides
, which is shown in below fig.
• Here, one coil side is inside one slot under one pole and
other coil side inside other slot under next pole.
Gandhinagar Institute of Technology4

5. Gandhinagar Institute of Technology5

6. Construction of concentrated winding
Gandhinagar Institute of Technology6
• In order to construct the diagram for a winding, the following
data must be known:
S - The number of slots in the stator
P – The number of poles
m – The number of phases
YS – The pitch of the winding
a – The number of parallel circuits in the windings

7. • The pitch of the winding is determined by
the formula
• The pitch is the distance between two sides
of a coil expressed as the difference between
the numbers of the slots in which the sides
lie.
• Another important value of the winding of
ac machines is the number of slot per phase
per pole denoted by the letter q. It can be
determined by the formula
P
S
YS =
mP
S
q
⋅
=
Gandhinagar Institute of Technology7

8. Example#1: on concentric winding
Gandhinagar Institute of Technology8
Full-Pitch ( average pitch)
i.e. there are two coils in a group
i.e. there is two coil groups per phase6
2
4
3
2
3K =⋅=⋅=
P
2
43
24
pm
S
q =
⋅
=
⋅
=
6
4
24
p
S
YS ===

9. 
7204180180 =⋅=⋅= Pγ


30
24
720
===
S
γ
α
slots4
30
120120
=== 

α
λ
Gandhinagar Institute of Technology9

10. PROCEDURE FOR CONSTRUCTING OF
CONCENTRIC WINDINGS
Gandhinagar Institute of Technology10
Data: S= 24, P = 4, a = 1, q = 2, K = 6

11. Coil Groups of Phase A
Gandhinagar Institute of Technology11
2. The first and second slots will be occupied by left-hand
sides of the first coil group of phase A.
3. Leave four, or 2q slots free for other two phases occupy
slots 7 & 8 with the right hand side of the first coil group.
4. Next to it will lie a second coil group of the same size which
occupies slots 9,10,15,16.

12. Coil Groups of Phase B
Gandhinagar Institute of Technology12
slots4
30
120120
=
°
°
=
°
=
α
λ


30
24
720
===
S
γ
α

13. Coil Groups of Phase C
Gandhinagar Institute of Technology13

14. Current direction
Gandhinagar Institute of Technology14
N
1-6
N
13-18
S
7-12
S
19-24

15. Phase A – Coil groups interconnection
Gandhinagar Institute of Technology15

16. Phase B – Coil groups interconnection
Gandhinagar Institute of Technology16

17. Phase C – Coil groups interconnection
Gandhinagar Institute of Technology17

18. Terminals
Gandhinagar Institute of Technology18

19. Gandhinagar Institute of Technology19