Single-phase induction motors

The purpose of this paper is to develop a complete vector analysis of single-phase induction motor performance as the basis for an accurate circle diagram applicable to motors of even the smallest commercial sizes. To accomplish this, it will be necessary to derive mathematically correct formulas or graphical construction for several quantities and relations which have been treated very loosely heretofore. Of these the most important are 1. The value of the secondary no-load current, as reflected in the primary. 2. The construction of the current circle. 3. The revolutions per minute.