A Method of Finding Equalizer Section for D-C Armature Winding [includes discussion]

This paper presents a new theorem for equalizer of d-c machinery and a simple method of estimating its required size, for d-c lap windings under some assumed type of unbalance, by an equation derived from the conventional revolving field theory of polyphase induction motors. It is shown that only a very small conductor section will be sufficient for ordinary anticipated type of unbalance. In reaching the equation, power limits of various types of d-c armature windings as a consequence of the permissible voltage between adjacent commutator bars are discussed.