The starting of single-phase induction motors having asymmetrical stator windings in quadrature

The operation of an asymmetrical 2-phase induction motor on single-phase supply system is analysed by the method of symmetrical components, and performance equations for the special problem of starting the machine are expressed in terms of three dimensionless parameters. The effects of variation of these parameters are studied in detail, and conditions for optimum starting performance are established. Starting characteristics are given for a wide range of the parameters, but it is shown that the best performance is obtained with a capacitive convertor selected to give minimum unbalance. Properly interpreted, the results are applicable to standard single-phase induction motors of any rating.