[W-MO-17] Alternator Analysis Using Tetrahedral/Pentahedral Mixed Mesh

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1.Introduction

Claw pole alternators are used commonly as alternators for automobiles – due to the unique 3D structure and complicated flow of magnetic flux, the 3D electromagnetic field simulation with the finite element method (FEM) is effective as an evaluation method of output power prediction.
Mesh models for analysis are generally created by automatically generating mesh composed of tetrahedral elements for geometry created with CAD. However, as rotors are solid cores for alternators, they require mesh accounting for skin effect due to eddy current and calculation takes too much time as the number of elements greatly increases. Solving speed rises not only with acceleration of the solver, but also generating mesh appropriate for the analysis model; this is also important in decreasing file size.
This paper looks at tetrahedral/pentahedral mixed mesh and aims to generate effective mesh to reduce calculation time. We compared calculation times and accuracy when analysis is run with conventional tetrahedral mesh, and investigated the effects of division size in the axis direction of pentahedral elements for mixed mesh.

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