CBSE : Class X : Science : Chapter 13 : Magnetic Effects of Electrical Current : What are the various parts of Electric motor ?

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  • Published date: April 8, 2019
    • Vasai East, Thane, Maharashtra

Ans : Following are the various parts of electric motor:

a) Armature Coil: It is rectangular coil of insulated copper wire. When the current flows through it, it becomes electromagnet 

b) Field Magnet : The armature is kept between the field magnet with North pole and South pole on the left and right sides in such a way that the arms AB and CA of the coils are perpendicular to the direction of magnetic field.

 c) Split ring or Commutator: A commutator is a ring cut into 2 parts seperated by some distance where R1 is connected to AB and R2 is connected to CD. The inner side of these halves are insulated and attached to the axle. The function of the commutator is to change the direction of electric current in the coil after every half rotation (180°) to keep the armature rotate in the same direction throughout.

 d)Brushes: B1 and B2 are two conducting stationary brushes made up of graphite or any other metal plate. The brushes are pressed tightly against the external edges of the split rings R1 and R2 of the commutators. The function of brushes is to supply continuous current to the rotating coil through the commutator.

 e) Battery : A battery is connected across the brushes to provide current to the armature through the split rings which in turn converts the electrical energy into the mechanical energy.

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