Armature Winding A Practical Analysis of Armature Windings for Direct-Current and Alternating Current Machines, Including Rules and Diagrams for Reco

David Penn Moreton

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: given in Fig. l()8. This winding is trebly re-entrant because the values of Y and S are both divisible by 3. Reduction of Total Inductors to Elements of a Single Turn. ln each of the windings shown in Figs. 89 to I08 inclusive-each element is represented as being composed of only two inductors. This is not always the case. S0 in applying the general equations. it is necessary first to reduce the total number of inductors to the number that would exist on the armature if each element were composed of only two inductors, by dividing the total number of inductors in the winding by the number of turns in one of the elements. For example, if.a six-pole, simplex, singly re-entrant lip winding is composed of 120 inductors and there are only 30 commutator segments, then each element is composed of 4 inductors-or two turns. In this case the number of induttors must be divided by 2 in order to get the value of the number of half-elements. Winding Tables for Armature Windings. All the electrical connections in an armature winding may be readily indicated by means Qf a winding table asshown on pages 84, 85-and 86. Thus in Table II, which corresponds to the winding shown in Fig 91 we find the following connections. Starting with inductor I you pass to the back of the armature, which is indicated in the table b zamount equal to the back pitch Y, -to inductor and then to the front end of the armature. From the front end of inductor 22 you drop back by an amount equal to Y, to inductor 5-etc. All the inductors composing the winding in Fig. 91 are passed through before you return to the starting point. _ The winding shown in_ Fig. I03 closes twice. see Table III. The winding shown in Fig. 107 closes three times-see Table l. Time of Commutation for Lap and Wave Wi..