Explain the principle of direct current dynamo and describe its working using a labelled diagram
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Answer ⤵️
A dc generator is an electrical machine which converts mechanical energy into direct current electricity.
Construction of direct current dynamo
It mainly consists of three main parts, i.e. Magnetic field system, Armature and Commutator and Brush gear. The other parts of a DC Generator are Magnetic frame and Yoke, Pole Core and Pole Shoes, Field or Exciting coils, Armature Core and Windings, Brushes, End housings, Bearings and Shafts.
1. Magnetic Field System of DC Generator :
The Magnetic Field System is the stationary or fixed part of the machine. It produces the main magnetic flux.
2. Magnetic Frame and Yoke:
The outer hollow cylindrical frame to which main poles and inter-poles are fixed is known as Yoke. It is made of cast steel or rolled steel for the large machines and for the smaller size machine the yoke is generally made of cast iron.
It provides mechanical protection to the inner parts of the machines.
3. Pole Core and Pole Shoes :
The Pole Core and Pole Shoes are fixed to the magnetic frame or yoke by bolts. Usually, the pole core and shoes are made of thin cast steel or wrought iron laminations which are riveted together under hydraulic pressure. The poles are laminated to reduce the Eddy Current loss.