Single-phase induction-motor performance

A COMMON procedure in the design of single-phase induction motors involves the determination of a stator winding to yield a desired maximum torque, followed by a check on motor performance. Yet in spite of the importance of the maximum torque value, little can be found in the technical literature concerning methods of predicting its magnitude, outside of those wherein the slip at which maximum torque occurs is substituted in the motor equations and the resulting maximum torque determined.¹ Inspection and trial from motor equations or the circle diagram are possible, but tedious, methods of approach.