Low power linear actuator for direct drive electrohydraulic valves

作     者：Yong LI Fan DING Jian CUI Qi-peng LI 

作者机构：State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China School of Mechanical and Automobile Engineering Zhejiang University of Science and Technology Hangzhou 310023 China 

出 版 物：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 (浙江大学学报（英文版）A辑（应用物理与工程）)

年 卷 期：2008年第9卷第7期

页      面：940-943页

核心收录：

学科分类：080704[工学-流体机械及工程] 08[工学] 080401[工学-精密仪器及机械] 0807[工学-动力工程及工程热物理] 0804[工学-仪器科学与技术] 

主　　题：Electrohydraulic valves Linear actuator Low power High pressure Positive magnetic stiffness 

摘      要：This paper presents a bi-directional permanent-magnet linear actuator for directly driving electrohydraulic valves with low power consumption. Its static and dynamic performances were analyzed using the 2D finite element method,taking into account the nonlinear characterization and the eddy current loss of the magnetic material. The experiment and simulation results agree well and show that the prototype actuator can produce a force of ±100 N with the maximum power being 7 W and has linear characteristics with a positive magnetic stiffness within a stroke of ±1 mm. Its non-linearity is less than 1.5% and the hysteresis less than 1.5%. The actuator s frequency response(-3 dB) of the displacement reaches about 15 Hz,and the most significant factor affecting the dynamic performance is identified as the eddy current loss of the magnetic material.