Orthogonal magnetic circuit radial magnetic suspension bearing based on symmetric self-lubricating flexible auxiliary bearing structure

Abstract

The invention discloses an orthogonal magnetic circuit radial magnetic suspension bearing based on a symmetric self-lubricating flexible auxiliary bearing structure. A rotor shaft (6) of the magneticsuspension bearing is sleeved with a rotor core (7), and the rotor core (7) is located on a stator tooth set (8A) of a stator core (8). A coil is mounted on the stator tooth set (8A) of the stator core (8), and two radial rigid magnetic conducting rings are mounted on an outer disc of the stator core (8). A certain clearance exists between the two radial rigid magnetic conducting rings in the axial direction to prevent the short circuit of a permanent magnetic circuit. A graphite inward protruding ring cooperates with a radial auxiliary bearing framework, is arranged in an inner ring cavity ofa radial flexible magnetic conducting ring and is compressed by a radial bearing check ring, and the graphite inner ring is prevented from axially sliding. A permanent magnet is mounted between the radial rigid magnetic conducting rings and the radial flexible magnetic conducting ring. The magnetic suspension bearing is divided into two parts in bilateral symmetry around the stator core in the axial direction, the design method that a radial magnetic bearing and an auxiliary bearing are combined into a whole is adopted, and the technical problem that the coaxiality of a traditional magnetic bearing and auxiliary bearing is low is solved.

Description

technical field [0001] The present invention relates to a magnetic suspension bearing, more particularly, refers to a magnetic suspension bearing with orthogonal magnetic paths based on a symmetrical self-lubricating flexible auxiliary bearing structure. Background technique [0002] Magnetic Bearing (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 Le Yun, etc., June 2016, Volume 63, Issue 6, published in "IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS". of the article figure 1 The overall structure of a typical high-speed magnetic levitation motor is introduced. figure 1 In the left half of , the radial support part of the high-speed magnetic levitation motor is formed by the a...

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 combination of magnetic levitation bearing and auxiliary bearing makes the axial length of the high-speed magnetic levitation motor much longer than that of the traditional mechanical bearing motor (at least about 2 times), thereby reducing the rigidity mode of the rotor

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