Adjustable electromagnetic negative stiffness low frequency inertia actuator and vibration active control system

CN122083113AActive Publication Date: 2026-05-26HARBIN ENG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HARBIN ENG UNIV
Filing Date
2026-04-23
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing inertial actuators struggle to simultaneously guarantee high force transmission rate and static load-bearing capacity of the moving part in ultra-low frequency vibration control, resulting in poor control performance, high system energy consumption, and an inability to effectively cope with ultra-low frequency vibrations characterized by long wavelengths, high energy, strong penetration, and high resonance risk.

Method used

Design an adjustable electromagnetic negative stiffness ultra-low frequency inertial actuator. The equivalent dynamic stiffness of the actuator is adjusted by controlling the current through the stiffness compensation coil in the electromagnetic negative stiffness component. The current amplitude of the stiffness compensation coil is adjusted according to the vibration characteristics of the controlled object. Combined with the design of the stator and mover components, the output force spectrum can be effectively adjusted.

Benefits of technology

It ensures the load-bearing capacity of the mover within a limited assembly space, improves the control effect of ultra-low frequency vibration, increases energy utilization, adapts to various vibration control scenarios, has a large output force amplitude, wide bandwidth, and fast response speed, adapts to complex environments, and improves control accuracy and versatility.

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Abstract

This invention provides an adjustable electromagnetic negative stiffness ultra-low frequency inertial actuator and an active vibration control system, belonging to the field of active vibration control technology. The actuator includes: a stator assembly comprising a stator core, a main coil, and a stator frame, with the stator core mounted on the stator frame and the main coil wound on it; a mover assembly comprising a mover magnetic conductor, a permanent magnet, a mover frame mounted on the stator frame, and a counterweight, with the mover magnetic conductor mounted on the mover frame and the permanent magnet embedded within it, and the mover frame having a counterweight; and an electromagnetic negative stiffness assembly comprising an armature, a yoke, and a stiffness compensation coil mounted on the counterweight, with the stiffness compensation coil wound on the yoke. This invention reduces the equivalent dynamic stiffness of the actuator by controlling the current of the stiffness compensation coil, and adjusts the current amplitude in the stiffness compensation coil according to the vibration characteristics of the controlled object, enabling rapid response to vibration control needs under various operating conditions and improving the active vibration control effect under ultra-low frequency conditions.
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Citation Information

Patent Citations

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  • Zero-stiffness vibration isolator

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  • Electromagnetic permanent magnet hybrid quasi-zero stiffness energy feedback vibration isolator

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