Abstract
When magnetic-passive bearings are heated, the magnetic properties of permanent magnets change and, therefore, the force of interaction between them changes. Depending on the temperature and exposure time, irreversible changes in the strength of the interaction of magnets occur, caused by changes in the magnetic structure, phase composition, as well as reversible changes due to the temperature dependence of the magnetization and coercive force of the magnet material. A distinctive feature of the operation of magnets in bearings is the effect of large external magnetic fields on them. For this reason, it is impossible to predict in advance the properties of bearings at elevated temperatures using only the data given in the literature for magnetically rigid materials or individual magnets. The influence of temperature on the interaction of two coaxially arranged magnets modeling a part of a bearing is theoretically and experimentally considered. Numerical values of temperature coefficients of changes in bearing capacity and stiffness of bearings are determined, as well as the theoretical conclusion about the constancy of these coefficients for bearings with optimal magnet sizes is confirmed.
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