液压与气动2026，Vol.50Issue(8)：65-74,10.DOI:10.11832/j.issn.1000-4858.2026.08.007
电液伺服阀力矩马达螺栓装配应力及其松弛对衔铁零位的影响分析
Effect of Bolt Assembly Stress and Its Relaxation on Armature Null Offset in Electro-hydraulic Servo Valve Torque Motors
摘要
Abstract
Inconsistent bolt preload and stress relaxation are critical factors causing armature null offset in electro-hydraulic servo valve torque motors.We establish a quantitative link between bolt preload and armature null offset using a joint ANSYS-COMSOL structural-electromagnetic simulation.Firstly,an ANSYS finite element model simulates five bolt relaxation modes to analyze the variation in air gap asymmetry.This deformation data is then imported into a COMSOL magneto-structural coupling model.This model quantifies the armature deflection angle for each case and defines an explicit predictive relationship between the bolt relaxation rate and the deflection angle.The results show that air gap asymmetry depends on the spatial distribution of bolt relaxation.Relaxation of bolts on the same lateral side produces the largest deflection angle.In contrast,simultaneous relaxation of bolts on the lower side or in diagonal positions has a negligible impact on the null position.In these cases,the structural deformations cancel each other in the lateral directions.关键词
电液伺服阀/力矩马达/螺栓/预紧力/气隙/零位偏移Key words
electro-hydraulic servo valve/torque motor/bolt/preload/air gap/null offset分类
机械制造引用本文复制引用
顾添翼,包慧铭,李佳,李松晶..电液伺服阀力矩马达螺栓装配应力及其松弛对衔铁零位的影响分析[J].液压与气动,2026,50(8):65-74,10.基金项目
国家自然科学基金面上项目(51675119) （51675119）
