Three-dimensional balancing magnetic bearing

Abstract

The invention relates to a bearing, in particular to a three-dimensional balanced magnetic bearing, which comprises magnetic components of which mirror images are symmetrically arranged on the same axes. The magnetic components are fixedly arranged in a tubular shell, the magnetic components comprise an inner sleeve and an outer sleeve which are sleeved together and have cylindrical tubular structures, the outer wall of the inner sleeve is fixedly sleeved with an inner sleeve magnetic ring, the inner wall of the outer sleeve is fixedly provided with an outer sleeve magnetic ring, the magneticfields of the inner sleeve magnetic ring and the outer sleeve magnetic ring are distributed in the radial direction, and the polarity of a magnetic pole inside the outer sleeve magnetic ring is the same as the polarity of a magnetic pole outside the inner sleeve magnetic ring. The three-dimensional balanced magnetic bearing is characterized in that at least two outer sleeve magnetic rings in eachmagnetic component and the inner sleeve magnetic rings with equal number as the outer sleeve magnetic rings are axially distributed; and in a magnetic pair consisting of one outer sleeve magnetic ring and one inner sleeve magnetic ring, at least one outer sleeve magnetic ring and one inner sleeve magnetic ring in one magnetic pair are mutually staggered at the radial position. The three-dimensional balanced magnetic bearing can keep the axial positions of the inner sleeve and the outer sleeve unchangeable; and simultaneously, the improved outer sleeve magnetic rings with unequal widths provide uneven magnetic fields, and the uneven magnetic fields can counteract the action of gravity so that the concentricity of the inner sleeve and the outer sleeve is better.

Description

technical field [0001] The invention relates to a bearing, in particular to a three-dimensional balanced magnetic force bearing. Background technique [0002] Bearings achieve the purpose of supporting the rotating shaft through the relative rotation between the inner sleeve and the outer sleeve. Ordinary bearings are provided with small friction mechanisms such as needle rollers and steel balls between the inner sleeve and the outer sleeve to reduce the friction between the inner sleeve and the outer sleeve. coefficient to improve the operating efficiency of the parts. Although this kind of bearing that replaces sliding friction with rolling friction can greatly reduce friction, the rolling friction is still very obvious for high-speed motors and special applications. In order to further reduce friction, magnetic bearings came into being. The magnetic bearing is to set a magnetic ring between the inner sleeve and the outer sleeve, and use the principle of magnetic repulsi...

AI Technical Summary

Problems solved by technology

While reducing friction, this kind of magnetic bearing also has certain defects, which limit its wide application: there is no axial positioning between the inner sleeve and the outer sleeve, and a small axial force can make the inner sleeve and the outer sleeve Axial offset occurs and collides with the shell, which will increase the friction force in the slightest and affect the service life of the bearing in severe cases

In order to achieve axial balance, some magnetic bearings use an additional active controllable magnetic device, which makes the structure of the magnetic bearing very complicated, which affects the industrial production efficiency, greatly increases the production cost, and the product failure rate is also high.

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