What is Generator & Types of Generator


A generator is an electrical machine which converts mechanical form of energy into electrical form. Generator works on the principle that whenever a conductor moves in a magnetic field, an emf gets induced in the conductor. This principle is called as generator action.
Generators have generally two basic parts named “Stator” and “Rotor”. Mechanical energy is provided to the rotor of a generator by means of a prime mover (i.e. a turbine). Turbines are of different types like steam turbine, water turbine, wind turbine etc. Mechanical energy can also be provided by IC engines or similar other sources.
To learn more about how generators work, read the following articles.



  • AC Generator (converts mechanical energy into Alternating Current (AC) electricity)
  • DC Generator (converts mechanical energy into Direct Current (DC) electricity)

AC generator

An AC Generator converts mechanical energy into alternating current electricity. Because power transferred into the field circuit is much less than power transferred into the armature circuit, AC generators nearly always have the field winding on the rotor and the armature winding on the stator.

AC generators

  • In an induction generator, the starter magnetic flux induces currents in the rotor. The prime mover then drives the rotor above the synchronous speed, causing the opposing rotor flux to cut the stator coils producing active current in the stator coils, thus sending power back to the electrical grid. An induction generator draws reactive power from the connected system and so cannot be an isolated source of power.
  • In a Synchronous generator (alternator), the current for the magnetic field is provided by a separate DC current source.

DC generator

An electric generator is a machine that converts mechanical energy into electrical energy. An electric generator works based on the principle that whenever conductor cuts the magnetic field, an emf is induced which will cause the current to flow if conductor circuit is closed. Take the working of Simple loop Generator as an example.


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