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**SEE 3433 Elements of Armature Winding in DC Machines**

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**Elements of an armature windings**

A turn – two conductors connected to an end by an end connector

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**Elements of an armature windings**

A coil – several turns connected in series

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**Elements of an armature windings**

A winding – several coils connected in series

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**Elements of an armature windings**

The angle between centers of adjacent poles is 180o (electrical) 180o electrical = 90o mech 360o electrical = 180o mech N S S N

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**Elements of an armature windings**

The angle between centers of adjacent poles is 180o (electrical) If coil sides are placed 180o electrical apart, the coil is said to be full-pitch N a b a b 180oelec S S N

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**Elements of an armature windings**

The most common ways of connecting coils for armature windings: Lap winding Wave winding Ends of the coils are connected to the commutator bars In DC machines most of the coils are full-pitch.

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**Elements of an armature windings**

Lap winding Commutator bar One coil between adjacent commutator bars 1/p of total coils are connected in series No. of poles no. of brushes no. of parallel paths

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**Elements of an armature windings**

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**Elements of an armature windings**

Wave winding p/2 coils in series between adjacent commutator bars ½ of all coils between brushes Regardless of no. of poles, there are always 2 parallel path The distance between end coils (commutator pitch) is 2(C1)/p where C is the no. of commutator bars

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**Elements of an armature windings**

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