Single shaft controlled type five-degrees-of-freedom (DOF) miniature magnetic bearing

Abstract

The invention discloses a single shaft controlled type five DOF miniature magnetic bearing which is used in working occasions with space constraint requirements. According to the invention, two same flange plates are arranged at left and right above a rotating shaft, and a rotor, two annular stator yokes, an annular axially magnetizing permanent magnet and two axially controlling coils are arranged between the two flange plates; axial air gaps exist between medial surfaces of the flange plates and two transverse planes of the rotor; the stator yokes are fixed arranged at two axial sides of the permanent magnet; the two axially controlling coils are arranged in a cavity formed by the two stator yokes and the two flange plates and are in bilateral symmetry relative to the rotor; a sensor isprovided with at one axial side of the rotating shaft; the permanent magnet generates closed loop static bias flux, and the axially controlling coils generate closed loop axially controlling flux. Passive magnetic bearing and active magnetic bearing are combined in the invention, which enables existing large-size magnetic bearings to be miniaturized; the miniature magnetic bearing provided in theinvention has the advantages of simple construction, low power dissipation, simple control and the like, and enables bearing capacity and working performance to be enhanced and application fields of the bearing to be broadened.

Description

technical field [0001] The invention relates to a non-mechanical contact five-degree-of-freedom magnetic bearing, in particular to a five-degree-of-freedom miniature magnetic bearing, which can be used as a magnetic levitation micro-motor, a commercial hard disk drive, a micro-turbine, an artificial heart axial flow pump, and a magnetic levitation storage device for spacecraft. It can be used as a non-contact suspension support for flywheel systems and other workplaces that require high-speed, clean and pollution-free, long-life mechanical equipment, medical equipment, satellites, and miniature rotating parts in spacecraft. Background technique [0002] The miniature magnetic bearing is a precision mechatronic product that uses the magnetic force between the stator and the rotor to suspend the rotor in space. It is suitable for special occasions such as high speed, ultra-clean and vacuum with limited space. Suspension requires constraints in all five degrees of freedom. [...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art that the magnetic bearing has a large structural size and cannot be applied to occasions with limited space requirements, and proposes a single-axis control type five-degree-of-freedom miniature magnetic bearing, which reduces the magnetic bearing structurally. The volume of the bearing reduces the power consumption of the magnetic bearing

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