Wave Rotor Winding Configuration for a 12-Slot 10-Pole Concentrated Winding Induction Motor

This paper presents a rotor winding configuration aimed at filtering space harmonics in the rotating magnetic field (RMF), resulting from stator fractional-slot concentrated winding (FSCW) configurations in 12-slot 10-pole induction motors. The design comprises multiphase full-pitch wave windings. The stator FSCW configurations generate a specific harmonic that produces the drive-torque and several other harmonics as the dominant components in the stator RMF. Conventional squirrel-cage winding rotors generate torques derived from all the dominant stator RMF harmonics. This inhibits the production of adequate drive-torque and line-start capability. The proposed wave-winding rotor traps the driving RMF harmonic and completely eliminates the effects of the other dominant RMF harmonics. This filtering effect on the stator RMF harmonics leads to the production of an adequate drive-torque and line-start capability. The efficacy of the proposed rotor winding configuration is determined by theoretically estimating the filtering effect on the stator RMF harmonics, numerically predicting the motor performance through a finite element method analysis, and demonstrating the actual motor performance of a prototype. This research provides insights into the design of IMs with stator FSCW configurations, particularly regarding rotor winding configurations, which has received insufficient attention in previous studies.