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introduction about electrical machines

*elecreical machines can be devided into:
 -generetors-which convert mechanical energy into electrical energy
 -motors- which convert electrical energy into mechanical energy.

*Both types operates through the interaction between a magnetic field and a set of windings



Classification of Electrical Machines



DC Generators and Motors(DC Machines):
A more efficient approach is to replace the two slip rings with a single split slip ring called a commutator.
   -This is arranged so that connections to the coil are reversed as the voltage from the coil changes polarity.
   -Hence the voltage across the brushes is of a single polarity.
   -Adding additional coils produces a more constant output.

Basic arrangement of dc machine:




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