A synchronous hunting electro-permanent magnetic composite thrust bearing and a quasi-zero stiffness design method in any interval thereof

By implementing synchronous axial movement control and quasi-zero stiffness design, the problem of asynchronous rotor axial movement in the electro-permanent magnet composite thrust bearing was solved, achieving a high-precision vibration reduction and isolation effect with low power consumption and low wear.

CN122216239APending Publication Date: 2026-06-16DALIAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DALIAN UNIV OF TECH
Filing Date
2026-05-19
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

In existing electro-permanent magnet composite thrust bearings, the asynchronous movement of the permanent magnet bearing rotor and the electromagnetic bearing thrust disk makes it difficult to achieve effective composite operation. Furthermore, traditional solutions suffer from wear, fatigue risks, and high power consumption.

Method used

By using a built-in displacement sensor to provide real-time feedback on the rotor position and a hollow hydraulic cylinder to adjust the position of the electromagnetic bearing coil, closed-loop synchronous control of the rotor's axial movement is achieved. Combined with the calibration of the permanent magnet bearing's force-displacement characteristics and the setting of the electromagnetic bearing's current parameters, quasi-zero stiffness design in any range is realized.

Benefits of technology

Dynamic control of the air gap between the electromagnetic bearing and the thrust disk was achieved, which reduced operating power consumption, reduced the risk of component wear and fatigue, and improved vibration reduction and isolation performance and control accuracy.

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Abstract

The application belongs to the technical field of hybrid magnetic bearing, and discloses a synchronous shifting electro-permanent magnetic composite thrust bearing and a quasi-zero stiffness design method in any interval of the synchronous shifting electro-permanent magnetic composite thrust bearing. The synchronous shifting electro-permanent magnetic composite thrust bearing is proposed, and the follow-up regulation and control of the air gap thickness between the electromagnetic bearing coil and the thrust disc can be realized through closed-loop control, so that the problem of the mismatch between the rotor shifting amount allowed by the permanent magnetic bearing and the rotor shifting amount allowed by the electromagnetic bearing is solved, and the synchronous shifting electro-permanent magnetic composite thrust bearing has technical advantages of low operation power consumption, complete suspension in the bearing direction, low risk of fatigue failure and wear of parts in actual application. Further, a quasi-zero stiffness design method in any interval of the synchronous shifting electro-permanent magnetic composite thrust bearing is proposed, and two control modes based on current control and air gap control are given, so that the quasi-zero stiffness design in any interval can be realized, thereby improving the longitudinal vibration reduction and isolation performance. The method is simple to operate and has high control precision in actual application.
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