Machine Parts

In lap winding it is seen that the coils are connected in series .So that the induced voltages are additive, that is one coil side under north pole is connected by end connections to the coil side under the south pole. This is in turn is connected in series with another coil having a coil side under the same north pole as the previous coil. But in a wave winding coil A has one coil side under the north pole and the other side under the south pole, coil B is connected in series with coil A. Coil B is not located under the same poles as coil A but under the next pair of poles as demonstrated in figure 1. As a sequence coil B and C is under the set of poles.                                   Protecting Coating Shop               ...

 The equivalent circuit of a four point – pole dynamo with a simplex winding. The voltage induced in each path is assumed to both to be same and should be if the reluctance of each magnetic path is the same, so that the lines of flux cut by each inductor of each path are the same. However wear of the bearings or deflection of the armature shaft may cause the armature to be closer to some poles and farther from others, thus changing the length of the air gap, and therefore the reluctance of the magnetic circuits of the poles is not identical. This factors cause the voltage in the materials making up the magnetic circuit. These factors cause the voltage in each parallel path differ, and the unequal voltages in turn cause flow of a circulating   current through the windings and brushes , undue heating of the armature and waste the power. To reduce the circulating current, points on the winding which should be at the same potentials are brought to the same potentials by c...