CALCULATING RADIAL ACTIVE MAGNETIC BEARINGS

Advantages and tasks of the use of the radial active magnetic bearing are reflected. The existent methods of calculations are expounded. Traditional methodology of calculation (developer Zhuravlev U.N.) includes determination of bearing geometry, calculation of puttee and thermal calculation.
For determination of geometry of the radial bearing optimization approach is used: maximal hauling effort will be realized in the set volume of bearing. A starting point in procedure of optimization of geometry is induction in the air-gap of B. It depends on magnetic descriptions of the used steel. In a difference from electric machines a magnetic satiation must not be in radial bearing, as it causes the loss of dirigibility.
The calculation of bearing puttee is further conducted. Radial bearing has four electromagnets, therefore his puttee contains four electric chains. Spools in a chain can be included consistently or in parallel. Obviously, that at the parallel including a greater electric current is required, but less tension. Losses on hysteresis in a rotor will be less than, if magnetomotive forces of two nearby poles of nearby electromagnets have identical direction. The thermal calculation of bearing consists in determination of maximal temperature of explorer of spool and comparison of her with a possible temperature for the used class of isolation. A calculation is based on the law of Оm for the set thermal stream.
This methodology calculation of bearing has defects, consisting in that as a result there are parameters at that maximal hauling effort and length of package can be more than it is necessary. I.V. Zotov and V.G. Lisienko offered methodology of calculation of bearing. It allows to find minimum necessary length of package at a maximal electric current. Accordingly, sizes and bearing cost diminish.
The analysis of methods showed that it is needed to perfect calculations for minimization of sizes and cost magnetic bearing. It is expedient to use these devices in the revolved parts of mountain machines and complexes.

Keywords

Bearing, electromagnet, methodology, calculation, hauling effort, magnetic chain, electric chain, thermal losses, thermal stream, thermal resistance, class of isolation.

Issue number: 5
Year: 2017
ISBN:
UDK: 621.3
DOI:
Authors: Shchekleina I. L., Ugol’nikov A. V., Gorelova A. E.

About authors: Shchekleina I.L., Candidate of Technical Sciences, Assistant Professor, e-mail: gmf.et@m.ursmu.ru, Ugol’nikov A.V., Candidate of Technical Sciences, Assistant Professor, Head of Chair, e-mail: ugolnikov@yandex.ru, Gorelova A.E., Student, e-mail: a.e.gorelova@yandex.ru, Ural State Mining University, 620144, Ekaterinburg, Russia.

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