Application of Ring Winding in Induction Motor

To solve the low power factor and efficiency of the conventional induction motor (IM), ordinary single-layer windings are changed to ring windings (RW) to improve motor performance. Firstly, structural features of RW are described. Then a dual-rotor ring winding induction motor (DRRWIM) is proposed, and the structure, magnetic circuit and circuit characteristics of DRRWIM are analyzed. Based on the analysis result, the motor design method for DRRWIM is proposed. The basic size is determined through the proposed method, and the electromagnetic performance of DRRWIM is calculated. Finally, a comparison between DRRWIM and the Y-type traditional IM with the same power and poles number proves that DRRWIM is more efficient and energy- saving.