Analysis and Design of a Two-Speed Single-Phase Induction Motor With 2 and 18 Pole Special Windings

Abstract—The motor presented employs multiple independent windings for operation with two very different pole numbers. The 18-pole field is produced with a symmetrical three-phase winding connected in a Steinmetz arrangement to a single-phase supply. A unified analysis method has been developed and used to demon-strate the equivalence of a Steinmetz delta or star connection with a main and auxiliary winding of a single-phase motor. The method has been experimentally validated and also included are some spe-cific motor design considerations. Index Terms—Asynchronous rotating machines, design method-ology, machine windings, phase conversion, single-phase induction motors, squirrel cage motors. I