The armature windings are placed or housed in the slots grooved on the surface of armature and and are so spaced such that one coils side or say a conductor of coil comes under north pole and the other coilside or second conductor comes under south pole.

Generally in D.C. machines two layer windings with diamond shaped coil is used.The coils are usually former wound.

How the coils are kept in position?

In small machines armature coils are held i position by means of band of steel wire which is wound under tension along core length.In large machine wedges of fiber or wood is used to keep the coils in position ie in the slots and use the wire band to overhang the coil.

Factors affecting armature winding

Armature winding plays an important role in the conversion of energy fro one form to another in electrical machines.The factors which should be given care while designing a winding is that the weight and material should be optimum or best for the high efficiency of machine.It should have necessary mechanical,electrical and thermal strength to meet the machine requirements and a life span about 16 to 20 years.It should be able to maintain the current collection at the commutator side without sparking.

Equilizer Rings

Equalizer connections or equilizer rings are located under the over hang on the commutator side.Equilizer rings could be also accommodated in the other end of armature.Equilizer rings are used to get uniform voltage.

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