May 12th, 2009
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We know that the armature circuit in lap winding of a multipolar machine has as many parallel paths as the number of poles. Because of wear in the bearings, and for other reasons, the air gaps in a generator become unequal and, therefore, the flux in some poles becomes greater than in others. This causes [...]
Written by John on May 12th, 2009 with no comments.
Read more articles on Armature Reaction and Commutation and Direct Current Machines and Electrical Machines.
In this method, an arrangement is made to neutralize the reactance voltage by producing a reversing voltage in the coil undergoing commutation. The reversing voltage acts in opposition to the reactance voltage and neutralizes it to some extent. If the reversing voltage is equal to the reactance voltage, the effect of the latter is completely [...]
Written by John on May 12th, 2009 with 3 comments.
Read more articles on Armature Reaction and Commutation and Direct Current Machines and Electrical Machines.
Improving commutation means to make current reversal in the short-circuited coil as sparkless as possible. The following are the two principal methods of improving commutation: (i) Resistance commutation (ii) E.M.F. commutation We shall discuss each method in turn. Resistance Commutation The reversal of current in a coil (i.e., commutation) takes place while the coil is [...]
Written by John on May 12th, 2009 with 1 comment.
Read more articles on Armature Reaction and Commutation and Direct Current Machines and Electrical Machines.
