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Analysis of FE: Mesh discretization for faster and more accurate probabilistic simulations: applied to cogging torque calculations in electrical machines

Peter Offermann (Institute of Electrical Machines (IEM), RWTH Aachen University, Aachen, Germany)
Kay Hameyer (Institute of Electrical Machines (IEM), RWTH Aachen University, Aachen, Germany)

Abstract

Purpose

The consideration of uncertainties in the numerical computation of electromagnetic fields has recently gained a lot of attention. Most publications focus on the creation of models for the uncertainty quantification, however, neglect the inaccuracy of the applied finite element model itself. Thus, the purpose of this paper is to analyze the influence of mesh quality on stochastic cogging torque calculations.

Design/methodology/approach

The presented work consists of three steps. At first, a conventional analysis of the influence of mesh accuracy onto cogging torque is presented. Afterwards, the method is extended to stochastic calculations. Based on a comparison of the convergence behavior of both approaches, a method for more accurate cogging torque predictions with fewer necessary calculations is derived.

Findings

An improved method to calculate probability predictions at minimum computational cost is presented and applied.

Research limitations/implications

The presented approach requires the exact knowledge of the system’s stochastic variation boundaries.

Originality/value

A fast method for more accurate stochastic cogging torque calculations is developed.

Keywords

Acknowledgements

The results presented in this paper have been developed in the research project “Propagation of uncertainties across electromagnetic models” granted by the Deutsche Forschungsgemeinschaft (DFG).

Citation

Offermann, P. and Hameyer, K. (2015), "Analysis of FE: Mesh discretization for faster and more accurate probabilistic simulations: applied to cogging torque calculations in electrical machines", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 34 No. 2, pp. 596-603. https://doi.org/10.1108/COMPEL-07-2014-0174

Publisher

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Emerald Group Publishing Limited

Copyright © 2015, Emerald Group Publishing Limited