ROTOR , ARMATURE CORE & ARMATURE WINDING, COMMUTATOR.

ROTOR:

              Armature:

·         The purpose of armature is to rotate the armature conductors in the uniform magnetic field.

·         It is further divided into two parts namely ;

             Armature core and Armature winding.

 

                                               

                                                             Fig: Armature core.

 

            Armature core:

·         It is cylindrical in shape mounted on the shaft as shown in fig.

·         It consists of slots on its periphery & the air ducts to permit the air flow through armature which serves cooling purposes.

·         It is made from high permeability silicon-steel stampings, each stamping being separated from its neighboring one by thin papers or varnish as insulation.

·         Armature core is for to provide a path of low reluctance to the magnetic flux produced by the field winding.                                                      

Armature winding:

·         It is but the interconnection of the armature conductors placed in the slots provided on the armature core periphery.

·         Armature windings is to generate e.m.f. in the armature winding in case of generator.

·         To carry the current supplies in case of dc motor

There are two types of winding in armature

1)      Lap winding

2)      Wave winding

                                                                                                 

                                                      Fig: Commutator & Brush.

COMMUTATOR:

·     The basic nature of e.m.f. induced in the armature conductor is alternating.

·     This needs rectification in case of D.C.  Generator, which is possible by device called commutator.

·      It is cylindrical in shape and is made up of wedge shape segment of hard drawn, high conductivity copper.

·     Commutator is for collect the current from the armature conductor.

·     And to collect internally developed alternately e.m.f. into unidirectional e.m.f.

                                                  Fig: Commutator.