The function of equalizer rings is to avoid un equal distribution of current at the brushes,there by helping to get sparkless commutation- by rizwan ahmad
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Certain "Lap" wound armatures.
Both lap winding and wave winding are found in the use of DC generators. The main difference is as follows: lap winding is high current, low voltage, and wave winding is low current, high voltage.
The lap winding is used in dc generators designed for high-current application
lap winding is most suitable for
This describes the way the machine's armature conductors are connected relative to each other and to the number of poles. The two basic ways of connecting these conductors are called 'lap' and 'wave', but it gets more complicated, because these, in turn, can be connected 'simplex', 'duplex', 'triplex', etc.For lap windings, if there are p poles, then for:simplex: pduplex: 2ptriplex: 3petc.For wave windings, the number of parallel paths are:simplex: 1 x 2duplex: 2 x 2triplex: 3x 2etc.So, for a triplex lap winding machine with six poles, the number of parallel paths will be: 3p =3 x 6 = 18 parallel paths.