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Concentric Winding (EED)
- 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