Shape Optimization of Conductor in Induction Motor For Torque Maximization

Motors using permanent magnet widely used for a power source of hybrid vehicle but nowadays lack of supplying of rare earth resources occurs cost increasing problem. Thus there are many efforts to substitute non-permanent magnet motor with permanent magnet motors and most of all squirrel cage type induction motor is announced for an alternative. A conventional approach for induction motor optimization problem is changing rotor conducting bar���s shape based on parameter optimization. However, with this technique, shape change and motor performance between initial and optimized model is not large different. Using Level-set method boundary of shape moves by sensitivity of objective function thus the optimized shape is different than parameter optimization result. In this paper, Level-set method applied to Squirrel Cage Induction Motor���s conducting bar for a power source of hybrid vehicle to maximize torque at operating region. To validate proposed method, compare the flux density at each angle of rotor, mean flux density at air gap and torque between optimized model and initial model