Abstract
The efficiency of motor can be increased by optimizing stator, rotor slot design and using more materials, but there is limit within the narrow space of motor frame. Because of limited dimension, high quality material can be adapted, such as copper bar instead of aluminum bar, or low core loss Si-steel. However, adapting low core loss electrical steel does not always mean reduction of core loss. Because of non-linearity of B-H and B-Loss data, applying high grade material could unintentionally increase losses. It is important to consider magnetic flux density and harmonic core loss when applying low core loss electrical steel. In this paper, losses of motor are analyzed with respect to the various electrical steel. Using the finite element analysis (FEA), core loss and stray load loss are calculated with B-H, B-Loss data of electrical steel. Also, test results of 440V, 4pole, 15/30kW induction motor are also provided.
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