Working of D.C Generator
As explained before the D.C generator converts mechanical energy
into electrical (D.C) energy. The generator is usually coupled to a prime-mover.
The prime-mover may be a diesel/petrol engine, or a turbine depending upon the
rating and application of the generator. The prime-mover converts some sort of
energy (diesel/petrol/water/steam/gas etc.) into mechanical energy. This mechanical
energy is supplied to the generator (i.e. generator input).
Working of D.C Generator
If the generator is very small for commercial purpose i.e.
for a shop or small work shop or cinema etc. the prime-mover is a diesel
engine. If the generator is very big like in power stations then the prime-mover
will be a turbine. Again depending upon the resources the turbine may be a
water turbine, steam turbine, gas turbine etc.
When the prime-mover output is given to the generator, the
generator armature starts rotating. Usually the poles on the yoke are made of
permanent magnets. Therefore, the armature conductors cuts the weak magnetic
field established by permanent magnets and small amount of e.m.f is induced in
the armature winding according to faraday laws of electromagnetic induction. This
induced e.m.f circulates a small amount of current through the field winding
and strengthens the magnetic flux established and hence the induced e.m.f thus
due to the reinforcement of the flux and e.m.f the generator establishes the
rated voltage.
You written clearly on DC Generator Working PrincipleDC Machine Construction
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