A no-thrust disc permanent magnet biased axial magnetic levitation bearing

By using a permanent magnet biased axial magnetic levitation bearing with no thrust disk design, the problem of structural damage caused by centrifugal force of the thrust disk is solved by superimposing the magnetic field generated by the stator annular iron core permanent magnet and the control winding, and a stable levitation effect with higher speed and lower power consumption is achieved.

CN122429166APending Publication Date: 2026-07-21NANJING TECH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING TECH UNIV
Filing Date
2026-04-14
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

The thrust disc of the existing permanent magnet biased axial magnetic levitation bearing is susceptible to centrifugal force under high-speed rotation, which leads to structural damage, vibration and reduced dynamic balance accuracy, limiting the speed increase and increasing equipment maintenance costs.

Method used

The design adopts a thrust-free design, using permanent magnets on both sides of the stator toroidal core to establish a bias magnetic field, and generating a control magnetic field through the control winding. The combination of these two technologies in the axial air gap achieves stable levitation of the rotor, avoiding the presence of a large-diameter thrust disk.

Benefits of technology

It reduces the centrifugal force on the rotor, improves dynamic stability, increases the upper limit of rotational speed, reduces the risk of structural damage, and lowers power consumption and control difficulty.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a kind of no thrust disc permanent magnet bias axial magnetic suspension bearing, including stator ring core, control winding, first permanent magnet, second permanent magnet and rotor core;First permanent magnet and second permanent magnet are respectively fixed on the left and right side ring surface of stator ring core;Control winding is installed on the center ring hole of stator ring core;Rotor core transversely penetrates the center ring hole of stator ring core, and first air gap ring groove and second air gap ring groove are spaced apart on the outer wall in the middle of rotor core, to form first axial air gap and second axial air gap.The no thrust disc permanent magnet bias axial magnetic suspension bearing adopts the design of no thrust disc permanent magnet bias axial magnetic suspension bearing, compared with existing permanent magnet bias axial magnetic suspension bearing, there is no large-diameter axial thrust disc, the centrifugal force borne by rotor core is reduced, not easy to damage, improve the dynamics stability of rotor core, and then promote the upper limit of rotational speed.
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