see 3433 elements of armature winding in dc machines l.
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SEE 3433 Elements of Armature Winding in DC Machines. Elements of an armature windings. A turn – two conductors connected to an end by an end connector. Elements of an armature windings. A coil – several turns connected in series. Elements of an armature windings.

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slide2

Elements of an armature windings

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

slide3

Elements of an armature windings

A coil – several turns connected in series

slide4

Elements of an armature windings

A winding – several coils connected in series

slide5

180o electrical

= 90o mech

360o electrical

= 180o mech

Elements of an armature windings

The angle between centers of adjacent poles is 180o (electrical)

N

S

S

N

slide6

a

a

b

b

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

180oelec

S

S

N

slide7

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.

slide8

Commutator bar

Elements of an armature windings

Lap winding

  • 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
slide10

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(C1)/p where C is the no. of commutator bars