Determination Scheme of Stator Parameters for Making Rotating Fields Circular in a Single-Phase Induction Motor

Unlike three-phase induction motors, circular rotating fields cannot be inherently formed in single-phase induction motors (SPIMs). Backward rotating fields inevitably result in elliptical rotating fields and degradations of the performance (efficiency, torque). Therefore, the necessity for making rotating fields circular should be emphasized to maximize the effectiveness of design at an arbitrary operating point. In this article, the determination scheme of stator parameters based on circular rotating fields is introduced from equivalent circuits. The derived parameters of stator winding consider circular rotating fields and minimizing copper loss of stator windings, respectively. Then, examples of the design demonstrate the validation of the algorithm. Finally, the comparisons between reference and designed model illustrate that the proposed algorithm can provide insight into the design of high-performance capacitor-run SPIMs.