Lap vs Concentric

Concentric vs lap winding in ac induction motor

Submitted to Prof.Ahmed Kadry By:Amr Diaa l Din !eg.no:"#$$%&$

Concentric 'inding: Development of a single phase single layer concentric winding for a 4 pole AC Machine having 24 slots. 1.Pole pitch = SlotsPole = 244 = ! 2."he pitch for larger coil = ! # 1 = $ %."he pitch for smallest coil = 1 4.&ased on the r'les( the winding is started from the starting end of the middle coil in the )rst *orth Pole( ie.( coil side 4. "he +ac, end of the coil side 4 is connected to the +ac, end of the oil side -( ie.( pitch for larger coil is added to coil side 4. "he front end of the coil side - is connected to front side of coil side $ to form concentric winding. 5. "he

following ta+le gives the complete winding ta+le for 4 pole 24 slot AC Machine

/inding Diagram 

AC (ap 'inding: Development of single phase( single layer AC lap winding for a 4 pole AC machine having 24 slots. 1.0n single layer winding( the n'm+er of coil is e'al to half the n'm+er of slots on the stator( so that each slots contains only one coil side. 2./e ,now that the pole pitch = *'m+er of Slots*'m+er of Poles = 244=! %.Slots per pole per phase( m = 24431 = ! 4.*'m+er of coils C=12 $.Slots 1 to ! and 1% to 15 lie 'nder *orth pole regions *1 and *2 respectively. Similarly slots 6 to 12 and 1- to 24 lie 'nder So'th pole regions S1 and S2 respectively. 0n other words( the )rst pole pair covers slots 1 to 12 and the second pole pair covers slots from 1% to 24. !.7or f'll pitch winding( angle +etween the two sides of the same coil is 158 degrees. 158 degrees corresponds to ! slots. 6.*'m+er of coilsor slots3 per pole= !. 5."he coil in slot no. 1 is to +e connected to coil in slot no. 1 9 slots per pole = 1 9 ! = 3 6 or +ac, pitch( :+ = 6( ie.( if slot no. 1 is at the +eginning of the )rst *orth Pole( *1( the slot no. 6 will +e at the +eginning of the )rst So'th Pole( S1. -."he winding pitch( : = 92 progressive winding3 10. "herefore(

the front pitch( :f = :+ # : = $.

 "he complete winding ta+le for 4 pole( 24 slot ac machine

11./hen the winding for one pole pair is completed then last coil side of this pair is connected to the )rst coil side of the net pole pair( ie.( coil in slot no.12 is connected in series with the coil in slot no. 1%. Similarly( the winding for the second pole pair is completed. 12.Ar+itrarily

ass'me a partic'lar c'rrent direction to the coil sides 'nder the pole

pairs. 7or the coil sides 'nder the north pole regions ass'me downward c'rrent direction for the So'th Pole regions( as shown in 7ig're +elow