Abstract
The main purpose of our study is to improve efficiency of an induction motor. This paper describes a design approach to decrease stray load loss including loss due to structures (called fundamental losses) and PWM waveforms (called harmonic losses) using magnetic field analysis, where small air gap length and magnetic wedges were applied. It was clarified that reducing the air gap length and applying the magnetic wedges decreased both fundamental loss and harmonic losses. Therefore, the combination of the stray load loss and iron loss of the developed motor was 32% less than that of the conventional one. Moreover, the total loss of the developed motor was reduced by 63% compared with the conventional one, and its fficiency was increased from 95.5% to 96.8%.
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