Classification of AC Winding Design
The windings used in rotating electrical machines can be classified as
1. Concentrated Windings
2. Distributed Windings
• All the winding turns are wound together in series to form one multi-turn coil.
• All the turns have the same magnetic axis.
• For concentrated winding, the number of poles is equal to the number of slots.
• Examples of concentrated winding are:
– field windings for salient-pole synchronous machines
– field windings for D.C. machines
– Primary and secondary windings of a transformer
• All the winding turns are arranged in several full-pitch or fractional-pitch coils.
• These coils are then housed in the slots spread around the air-gap periphery to form phase or commutator winding.
• Number of poles is not equal to the number of slots.
• Examples of distributed winding are
– Stator and rotor of induction machines.
– The armatures of both synchronous and D.C. machines.
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