This paper presents core loss analysis of 3-phase induction motors used for industry applications. The core loss is affected by the time rate of the change of magnetic flux density. Generally core loss is spread out in stator and rotor core. And, rotor core loss is less than stator core because of constant field flux density of rotor. Tooth core loss density is large than yoke core loss because tooth has harmonic distortion of flux density. In this paper, transient finite element method used to analyze the magnetic flux density waveform in order to analysis the flux density according to varying time. Core losses in each element are evaluated using core loss curve tested by and Epstein test apparatus. Its result is shown the distribution of core loss density and partial thermal source.
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