Estimation of 3-D eddy currents in conducting laminations by an anisotropic conductivity and a 1-D analytical model

To circumvent the high computational costs of modelling each lamination to compute the eddy current distribution in three dimensions in conducting lam inations, a simple method has been developed. The laminar nature of the edd y currents due to the magnetic leakage field has been considered by applyin g an anisotropic conductivity with zero or very low value in the direction normal to the laminations. This yields an overall field distribution servin g as basis. In a second step, the much smaller eddy current loops caused by the main magnetic flux parallel to the laminations have been taken into co nsideration by a one-dimensional analytical model Nonlinearity is neglected .