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In depth investigation on the physics based mechanisms of the losses in a single silicon steel sheet used in electrical machines

In this work a 3D nonlinear time-stepping simulation is used to directly calculate the eddy currents in a standard silicon steel lamination. The Finite Element model contains a lamination stack which is exposed to a rotating magnetic field. The travelling wave in the air-gap consists of a single harmonic which is calculated for a reference machine and based on an equivalent frequency concept. The calculation of the iron losses with the statistical loss model is compared with the direct 3D eddy current simulation. The statistical loss model is underestimating the losses, and it is shown that the influence of the eddy currents on the magnetic field distribution cannot be neglected.