基于分段动子的长行程永磁式磁浮重力补偿机构设计及优化

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中图分类号：TB9 文献标志码：A 文章编号：1674-5124（2025）11-0025-07

Abstract：Magnetic gravitycompensation （MGC） is a non-contact support technique that utilizes magnetic force to partially or fully counteract gravity. Permanent magnet gravity compensation （PMGC） can achieve a constant levitation force output by optimizing the internal magnetic field distribution， fering significant advantages such as zero power consumption， no Joule heat， simple structure， high reliability. However， a keychallenge in designing PMGC mechanisms for engineering applications isachieving stable buoyancy output with a long stroke high load capacity within a constrained space.To meet the dems ultraprecision positioning platforms for gravity compensation systems with long stroke high stability， this paper presents an optimized design a permanent magnet magnetic levitation gravity compensation device （MGC22- 30） based onasegmented mover.The device incorporatesan axiallyextended asymmetric segmented mover structure to reduce the axial gradient magnetic flux density， thereby significantly minimizing buoyancy fluctuation. Using a finite element simulation platform，this study systematically analyzes the influence key structural parameters the mover stator—including magnet length ratio， spacing， cross-sectional size—on the average output buoyancy buoyancy fluctuation rate.A multi-parameter collaborative optimization scheme is proposed.The optimized structure achieves an average buoyancy output 22.38N within a stroke range ±15mm in simulations，with the buoyancy fluctuation rate reduced to 7.3% .Experimental results from a prototype show that within the ±15mm stroke range， the average output magnetic buoyancy exceeds 22N witha fluctuation rate below 7% ，meeting the design requirements showing strong agreement with the simulation results. This validates the effectiveness the structural design modeling approach. The research outcomes provide a feasible pathway for the engineering implementation long-stroke magnetic levitation compensation systems fer valuable insights for constructing multidegree--freedom，low-power magnetic levitation support platforms.

Keywords： magnetic gravity compensation; segmented actuator; structural optimization; buoyancy fluctuation; finite element simulation

0 引言

重力补偿是高端制造与测试装备中的关键零件，其核心功能是通过施加与负载重力反向的支撑力，使目标系统处于准无重力状态。（剩余9570字）