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OA

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.