Daily Concept Booster Electrical Engineering: Classification of AC Winding Design

Table of Contents

Classification of AC Winding Design

The windings used in rotating electrical machines can be classified as
1. Concentrated Windings
2. Distributed Windings

Concentrated 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

Distributed Windings

• 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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