A Design Method for Non-Skewed Small and Medium Cage Induction Motors

This paper presents a design method for non-skewed small and medium cage induction motor based on the finite element analysis, in which the approaches of asymmetrical rotor slots, closed slots, nearly slot combination and reasonable air-gap length are adopted and studied systematically. With this method, the cage induction motors with non-skewed rotor bars can be realized meanwhile, the slot harmonic, which is caused by slot opening, can be eliminated effectively and the efficiency can also be improved apparently. Finally, a design example for a 5.5 kW induction motor is also presented.