A Novel Slitted Tooth Core Design to Improve the Torque-Speed Characteristic of Squirrel Cage Induction Motor

Abstract

In this study, a new design was suggested in order to improve the performance of induction motors. In these new designs, slits were applied in the middle of stator and rotor tooth parts. In these slitted models, the depth and width of slits were optimized by Finite Element Method Magnetics (FEMM) by using Finite Elements Method (FEM). Starting torque, pull-out torque, rated torque and torque-speed characteristics of the new motor model formed with the proposed slitted construction and reference motor model are given in comparison. The motor model is made with 56 slits which have different depth and width to see the effects of slits in the stator and rotor. In modeling, 3 kW squirrel-cage induction motor was used. As a result of modeling, increase in the coupling flux provided 2.085% and 4% increase especially in pull-out and rated torque values respectively.