1. LOSSES IN DC MACHINE PREPARED BY Mukesh pal 130510109046
Himanshu panchal
Kushal panchal
Parth Parikh
Tejash parikh
Mayur parmar

2. Losses in dc machine

3. Copper losses:-
This losses occur in those part of de machines which carry electric current.
Copper losses occur due to the current flowing in various windings of the machine.
Armature copper loss
Shunt field copper loss
Series field copper loss

4. Iron losses
These losses occur in the armature of a dd machin and are due to the rotation of armature in the magnetic field of poles.
There are two types
Hysteresis losses
Eddy current losses

5. Hysteresis loss
This is losses is due to the reversal of magnetism of the armature core.
This losses is occur in armature for and teeth of the dc machine
Hysteresis losses can be reduce by using core material of silicon steel which has low hysteresis coefficient.

6. Eddy current losses
When the armature core rotates in magnetic field of poles, it also cuts the magnetic flux. Hence an emf is induced in the body of the core according to the laws of electromagnetic induction. This emf sets up current in the body of the armature core and is known as eddy current loss.
The power due to the flow of this current is known as eddy current loss is given by

7. Mechanical losses
Due to the friction of bearings, air friction or wind age losses occur in dc machines. these are known as mechanical losses.
Friction loss e.g., bearing friction, brush friction etc.
Wind age loss e.g., air friction of rotating armature. .

8. Thank you