Radial and axial three-degree-of-freedom magnetic bearing with magnetism-isolating ring

Abstract

The invention discloses a radial and axial three-degree-of-freedom magnetic bearing with a magnetism-isolating ring, which comprises a stator and a rotor, the rotor comprises a rotary shaft and a rotor core, the stator comprises a radial core, a permanent magnet and the magnetism-isolating ring which are radially and outwardly connected in sequence along the rotor core, two axial cores are symmetrically arranged on both sides of the rotor core, a radial working air gap is arranged between the radial core and the rotor core, a radial control winding is wound on the radial core, the magnetism-isolating ring is located between the outer edges of the two axial cores, two sets of attracting disks are respectively concentrically arranged on the internal walls of the inner edges of the two axialcores, control disks are concentrically arranged between the two sets of attracting disks, and axial levitation windings are respectively wound on the two sets of the attracting disks. The size of themagnetic bearing disclosed by the invention is small, the production process is simple, the structure is compact, axial levitation force is not coupled with radial levitation force, and axial biasedmagnetic fluxes on both sides of the radial part of the rotor are always equal.

Description

technical field [0001] The invention relates to the field of three-degree-of-freedom magnetic bearings, in particular to a radial and axial three-degree-of-freedom magnetic bearing with a magnetic isolation ring. Background technique [0002] Compared with the mechanical bearings used in traditional motors, magnetic bearings can effectively solve the vibration, wear, Friction, need for lubrication, etc. The unique design principle of the magnetic bearing makes it have high application value and broad application prospects in the fields of high speed, high precision and vacuum. [0003] Patent Publication No. CN201410156526, a patent document named a three-degree-of-freedom magnetic bearing and patent publication No. CN201410461449, a three-degree-of-freedom hybrid magnetic bearing proposed in a patent document named a new axial-radial three-degree-of-freedom hybrid magnetic bearing , the stator is composed of axial and radial iron cores, and the rotor is always in a state ...

AI Technical Summary

Problems solved by technology

As we all know, for the same air gap size, due to the use of high-performance permanent magnet materials, the air gap magnetic field strength generated by the permanent magnet is very large, up to 0.8T or higher, while the air gap magnetic field strength generated by the winding electrification is small, About 0.2T~0.3T, when the suspension control flux adjusts the bias flux, one side decreases from 0.8T to 0.5T, while the other side increases from 0T to 0.3T, the direction of the rotor force does not change , resulting in the axial failure to start

[0004] Patent Publication No. CN201110232913, named as a radial-axial three-degree-of-freedom AC-DC hybrid magnetic bearing, adopts double permanent magnets to provide axial and radial bias magnetic flux structure, although it solves the problem of axial start-up difficulty, but The two permanent magnets in its structure occupy the inner space of the bearing, so that the winding occupies a small space, the axial and radial magnetic pole areas are reduced, and the axial and radial levitation forces generated are reduced; in addition, because the thickness of the magnetic isolation material must be Determined according to the thickness of the air gap, the use of multiple magnetic isolation rings results in a complex structure, high manufacturing process requirements, and high prices

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