Orthogonal Magnetic Path Shaft Integrated Magnetic Suspension Bearing Based on Symmetrical Self-lubricating Flexible Auxiliary Bearing Structure

Abstract

The invention discloses an orthogonal magnetic circuit radial-axial-integrated magnetic bearing based on a symmetrical self-lubricating flexible backup bearing structure. A radial magnetic bearing coil of the orthogonal magnetic circuit radial-axial-integrated magnetic bearing is mounted on a stator tooth set of a stator iron core; two radial rigid magnetic-conductive rings are mounted at an outerdisc of the stator iron core so as to prevent the short circuit problem of permanent magnetic circuits, wherein a certain gap exists between the two radial rigid magnetic-conductive rings; an axial magnetic bearing coil is located at a thrust disc of a rotor shaft and mounted in a cavity formed by the two magnetic-conductive rings; graphite rings and backup bearing skeletons which achieve the axial self-lubricating effect are arranged on the two sides of the thrust disc correspondingly; and a radial backup bearing skeleton and a graphite internal convex ring are arranged in an inner ring cavity of a radial flexible magnetic conductive ring for achieving the radial self-lubricating effect. By adopting the technical means that axial and radial electromagnetic circuits are combined into a whole, and a radial magnetic bearing and a backup bearing are combined into a whole, the technical problem that traditional magnetic bearings are low in coaxiality is solved.

Description

Technical field [0001] The invention relates to a magnetic suspension bearing, and more particularly, to an orthogonal magnetic path axis integrated magnetic suspension bearing based on a symmetrical self-lubricating flexible auxiliary bearing structure. Background technique [0002] Magnetic Bearing uses magnetic force to suspend the rotor in the air so that there is no mechanical contact between the rotor and the stator. [0003] For the structure of the magnetic levitation motor, please refer to "Modeling and Design of 3-DOF Magnetic Bearing for High-Speed ​​Motor Including Eddy-Current Effects and LeakageEffects", author Yue Yun, etc., Vol. 63, Issue 6, June 2016, published in "IEEE TRANSACTIONS ONINDUSTRIAL ELECTRONICS". Of this document figure 1 The overall structure of a typical high-speed magnetic levitation motor is introduced. figure 1 In the right half of the high-speed magnetic suspension motor, the auxiliary bearing (Backup bearing) and the radial-axis integrated magn...

AI Technical Summary

Problems solved by technology

[0005] 1. Since the magnetic suspension bearing stator and the auxiliary bearing are respectively fixed on different parts, it is difficult for the magnetic suspension bearing stator and the auxiliary bearing to meet the high coaxiality requirements, and then the magnetic gap and the auxiliary bearing are asymmetrical, so that the control system is very difficult. Difficult to achieve high-precision control of magnetic suspension bearings

[0006] 2. When the high-speed maglev rotor loses stability, it will collide violently with the auxiliary bearing. Due to the high rigidity and low damping of the traditional mechanical bearing, the balls of the mechanical bearing are easily deformed by high-frequency impact and the auxiliary bearing will be "stuck" The high-speed rotor and the inner ring of the auxiliary bearing have severe friction, and a large amount of frictional heat will cause the rotor and the auxiliary bearing to fuse together, and the high-speed magnetic levitation motor will be scrapped

[0007] 3. The combined use of magnetic levitation bearings and auxiliary bearings makes the axial length of the high-speed magnetic levitation motor much longer than that of traditional mechanical bearing motors (at least about 2 times), thereby reducing the rigidity mode of the rotor

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