[W-MO-13] Evaluation of a 2D Brush Motor Analysis Accounting for 3D Geometry

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1.Introduction

As brush motors are cost efficient and do not require control circuits, these familiar DC motors are used in a wide range of applications, from toys to industrial products.
Though brush motors have a relatively simple operating mechanism, performing an analysis on them is difficult, and the following items pose challenges.
 - Since current flows by mechanical contact between a brush and a commutator, the model must take this brush-commutator contact into account.
 - The axis length of the rotor core, magnet, and housing are all different, so magnetic flux in the axial direction cannot be ignored.
 - Because the housing is thin, magnetic saturation has a large effect, leading to an increase in magnetic flux in the axial direction.
In this applied case, the structure of a 2D analysis model accounting for 3D geometry is evaluated through the comparison with a 3D analysis model. The modeling validity is proved by comparing these results.

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