INTECIN   20395
INSTITUTO DE TECNOLOGIAS Y CIENCIAS DE LA INGENIERIA "HILARIO FERNANDEZ LONG"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Modeling of iron losses in toroidal cores
Autor/es:
SILVEYRA JM; DI LUOZZO, N
Lugar:
San Pablo
Reunión:
Congreso; Soft Magnetic Materials Conference SMM22; 2015
Resumen:
Research interest in iron losses has grown significantly in the last decades, motivated by the need of lower iron losses for high-efficient electric machines. In contrast, higher iron losses improve the efficiency of many industrial processes based on induction heating [1]. Here, inductors carrying time-varying current generate iron losses in the material to heat it up.Even though iron losses have been investigated for more than a century, accurate modelling remains to be a challenge [2]. Models based on Steinmetz equation and loss separation approaches are well suited for fast calculations. The Loss Surface Model, among others, has been proposed to obtain higher accuracy. But these only hold if skin effect is negligible. For bulk and low-resistivity cores, field distribution has to be considered.We present the numerical modelling of the iron losses generated during the tempering by induction heating of a steel ball-bearing race. We discuss the performance of direct and post-processed approaches in the finite element analyses (FEA). To validate the simulations, we measured the iron losses of a solid toroid at frequencies from 50 Hz to 20 kHz, by means of an automatic magnetic hysteresisgraph that supplies sinusoidal voltage. We used theactual current waveforms for exciting the core in the FEA time-dependent studies, rather than energy-equivalent sinusoidal excitations.[1] Rudnev, et al. Handbook of induction heating,2002[2] Krings. Iron Losses in Electrical Machines,2014