采用磁流体的液压伺服阀力矩马达三维有限元分析(英文)

Analysis of Hydraulic Servo Valve Torque Motor with Magnetic Fluid Using 3-Dimensional Finite Element Method

力矩马达是电液伺服阀的关键元件之一,其输出力矩特性对伺服阀性能具有较大的影响。利用磁流体(magnetic fluid,MF)具有较大的磁导率和在外加磁场作用下具有较大磁化强度的特点,通过在液压伺服阀力矩马达的工作气隙中添加磁流体来改善伺服阀力矩马达磁路效率,提高伺服阀动态性能。给出了添加磁流体的力矩马达磁路三维有限元分析模型。利用电磁场三维有限元分析方法对添加磁流体和不添加磁流体的力矩马达的磁场分布及力矩特性进行了分析。结果表明:添加磁流体后力矩马达的磁场强度及衔铁输出力矩值有明显改进。

As the electric-mechanism converter, torque motor is the key component of the electrohydraulic servo valve. Its characteristics influence the performance of servo valve significantly. Since magnetic fluids have larger magnetic permeability and bigger magnetization intensity under an external magnetic field, the magnetic circuit efficiency of the torque motor and the dynamic performance of the servo-valve can be improved by applying a magnetic fluid. This paper proposed a three-dimensional, finite-element analysis model of torque motor with magnetic fluid. The magnetic field distribution and the torque characteristics of the torque motor are studied with or without magnetic fluids by using three-dimensional finite element and analytical methods. The conclusion is drawn that the torque characteristics of the torque motor with magnetic fluid could improve markedly as compared with that without magnetic fluid.