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It is the process of conversion of generated ac voltage into the armature of a dc generator to dc voltage at the terminal of the dc generator by use of pair of brushes and commutator.
OR It is the process of conversion of given dc voltage at the terminal of the dc motor to ac voltage in the armature windings in a dc motor by use of pair of brushes and commutator.
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∙ 13y ago
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Why DC transformer is not available?
it does so...as because of commutation process. bcoz......in dc current we cant avoid sparking and hence it uses ac supply.... so that i changes its direction in up nd down motion just like a sine wave..so commutation procees occurs..and it avoids sparking.......... hence ac is preferd
Why carbon brushes are used in DC machines?
Carbon brushes used in DC machines because carbon is soft material and it does not generate spikes when contact with commutator
What is a line commutation?
it is the natural commutation ...by making open circuit or short circuit on the thyristor to make it turn off.
What are different types of electric machines?
Based on the electric supply electric machines are classified in to two types namely AC and DC machines. These are further classified in to different ones.
What is a compound dc generator?
generators are machines that convert machanical energy to electrical energy and could be AC or DC. if in a DC generator has it field armature connection in both series and parallel its said to be compound dc generator.
What are the problems of commutation in a DC generator?
1.resistance commutation 2.e.m.f commutation
What are the difference between choppers and inverters?
chopper transforms ac to dc (dc chopper) while all inverter transform dc to ac commutation used in chopper: forced,load commutation used in inverter:forced(180 vsi),natural or line(120 vsi)
How does the area of copper-carbon contacts decide the distribution of current in commutation process of DC machine?
Copper carbon decides the distribution of commutation from the rotation. It tells what direction for it flow.
How does voltage commutation work in DC machine?
In voltage commutation process, the introduction of interpoles between main poles compensate armature mmf and reduces the effect of armature reaction.
What is the difference between current and voltage commutation?
Voltage commutation: This is possible in ac circuits...The thyristor gets turned off by reverse bias (negative half cycle) voltage applied across it. This is also called line commutation. Current Commutation: This is possible in dc circuits ...This type of commutation makes use of auxiliary circuit which contains inductor,capacitor,diode and even a thyristor(auxiliary). This is called Forced commutation.
What has the author Francisco A Guillen written?
Francisco A. Guillen has written: 'DC-side single commutation inverter'
What is magnetic neutral axis in dc machines?
connects the brushes to obtain a good commutation. its also a line joining two points at which no emf is induced.
What is mechanical loss in dc machines?
Friction and windage causes mechanical loss in DC machines.
What are the types of commutation?
Two types of commutation process 1) Natural commutation 2) Forced commutation
What is the principles of DC machines?
All DC machines are works based on the principle of FARADAY'S LAW OF ELECTROMAGNETIC INDUCTION.
Why DC transformer is not available?
it does so...as because of commutation process. bcoz......in dc current we cant avoid sparking and hence it uses ac supply.... so that i changes its direction in up nd down motion just like a sine wave..so commutation procees occurs..and it avoids sparking.......... hence ac is preferd
How commutation can be improve?
Generally there are two methods of improving Commutation :- 1.Resistance Commutation 2.Emf or Voltage Commutation The Commutation can also be improve by using interpoles and compensating windings.
