液压与气动2025，Vol.49Issue(4)：1-10,10.DOI:10.11832/j.issn.1000-4858.2025.04.001
基于形状记忆合金的阀用线性力马达响应特性研究
Research on the Response Characteristics of Linear Force Motor for Valve Based on Shape Memory Alloys
摘要
Abstract
Current valve electromagnets face issues of large size,heavy weight,and high cost.A linear force motor scheme using electrically-heated NiTi shape memory alloys wire to electrically heat and drive the valve core is proposed.Based on Brinson's one-dimensional constitutive equation,a thermodynamic model of shape memory alloys is established.MATLAB Simulink is used to simulate shape memory alloys wire electro-thermal behavior under varying currents,and the heat-induced effects on linear force motor actuation are analyzed.When the spring stiffness is 20 N/mm,the maximum displacement and driving force of three different lengths of shape memory alloys wires with a diameter of 0.5 mm are calculated theoretically.Finally,a test bench is built.When 6 A current is applied at 22℃,the three different lengths of shape memory alloys wires reach the maximum displacement of 1.8,2.1,2.5 mm respectively at about 0.5 s.The corresponding driving forces are 58.4,61,80 N.Compared with the simulation results,the displacement and driving force errors are both within 10%.The natural cooling response time after power-off is 5 s,and the total response time is 5.5 s.The results show that it is feasible to use shape memory alloys linear force motor to drive the hydraulic valve with a frequency response below 0.2 Hz.关键词
形状记忆合金/热力学/响应时间/位移/驱动力Key words
shape memory alloys/thermodynamics/response speed/displacement/driving force分类
机械工程引用本文复制引用
魏列江,蔡江荣,万思梦,卢红煜,陈奕泽..基于形状记忆合金的阀用线性力马达响应特性研究[J].液压与气动,2025,49(4):1-10,10.基金项目
国家重点研发计划项目(2022YFB3403003) （2022YFB3403003）
