Local Magnetic Properties in Operating Brushless DC Motor

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Kunihiro Senda, JFE Steel Corporation

Abstract

Distribution of the local magnetic properties in the stator of a brushless DC motor under rotating state has been measured using a two-dimensional magnetic sensor with needle probes and Hall elements. Several features that cannot be predicted by simulation calculation have been found, such as rotational behavior of flux density in the yoke and in the teeth, asymmetric rotational flux behavior at the joint part between the yoke and teeth depending on rotation direction, and inhomoge-neous flux density distribution in the yoke.

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