ホール素子法による玉軸受の玉の運動計測法に関する誤差の検討

概要

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It is well known that balls in a ball bearing are rotating three dimensionally. But it is not so easy to obtain this three dimensional ball motion experimentally. The only one method ever reported heretofore is the Hall element method developed by Kawakita et al., where some Hall elements are arranged around a magnetized ball so as to detect an orientation of a magnetic axis of the ball. Nevertheless the reported angular velocity has large fluctuation. This study was carried out to find out the cause of this fluctuation to increase the accuracy of the Hall element method. It starts from the derivation of some equations required to calculate the magnetic field around a uniformly magnetized ball. By means of these equations some possible factors are evaluated to cause fluctuation such as miss-alignment of the Hall elements, calculation method for angular velocity components and a slight deviation from the theoretical sinusoidal wave of the Hall voltage. The result shows all these factors have some responsible for fluctuation in angular velocity components especially the deviation from the theoretical curve has a large responsible for it.
一般社団法人日本機械学会の論文
1999-06-25