Difference between ac and dc generator

 We all know that the power electronics knowledge is that the AC generator generates an output voltage which alters in amplitude as well as time whereas the DC generator as a constant output voltage which does not change in amplitude as well as time. Here this post gives information about the difference between AC and DC generator to better understand this topic.


The main KEY difference between AC and DC generator are given below:

  • AC generator is a mechanical device which converts mechanical energy into AC electric power while in DC generator is a mechnical device which converts mechanical energy in DC electric power supply.
  • AC generator generates AC electric power while the DC generator generates DC electric power.
  • In AC generator current flow in one direction while in DC generator current periodically change direction.
  • AC generator has slip rings, while DC generator uses a split ring commutator.
  • AC generator requires very less maintenance and thus more reliable than a DC generator while DC generator requires frequent maintenance.
  • In AC generator slip rings have smooth and uninterrupted surfaces which allow the brushes to remains in contact uninterrupted with the slip ring surfaces. Hence the brushes do not wear as quickly as in case of a DC  generator and there is almost no possibility of a short circuit while DC generator uses commutators and brushes were out quickly in the commutator because of sparking.
  • AC generator requires very less maintenance and thus more reliable than a DC generator while DC generator requires frequent maintenance.
  • AC generator used to generate very high voltages, DC generator used to generate comparatively lower voltages.
  • AC generator does not have commutator, DC generator possesses commutators in order to counter the changing polarities effect.
  • AC voltage can be distributed quite easily using a transformer but in DC generator DC voltage is comparatively difficult to distribute efficiently.
  • AC generator has a different type like rotating armature, single phase, three phases, rotating field while in DC generator has a different type like a permanent magnet, Self-excited and separately excited.

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