单相对称磁路湿式力矩马达研究

Research on Wet Type Torque Motor Based on Symmetrical Magnetic Circuit with Singlephase Excitation

摘要:

现有的2D阀用电-机械转换器从磁路原理和结构而言均较为复杂，且不能在湿式状态下工作。为此，基于单相对称磁路设计了一种结构简单、有限转角的新型湿式力矩马达，制作了实验样机并搭建了实验平台，分别基于磁路解析、数值模拟和实验研究了该马达的力矩-转角特性以及频率响应等主要特性。实验结果和模拟结果基本相符，显示该马达的矩角特性曲线呈线性关系，且幅值随着电流增加而增大，其静力矩幅值达到0042N〖DK〗·m，实测频响能够满足直驱式2D比例阀和换向阀等的使用要求，适合作为此类场合的电-机械转换器。

Abstract:

In order to solve problems that conventional electromechanical converter of 2D valve had deficiency of complicated magnetic circuit, intricate structure and lacking high pressure resistance, a torque motor with simple structure, limited working stroke and high pressure resistance was developed based on symmetrical magnetic circuit with singlephase excitation. Working principle and detailed structure were discussed. Prototype motor was fabricated and test rig for static and dynamic characteristics was built. Torqueangle characteristics and frequency response were studied using approaches of magnetic circuit analysis, FEM simulation and experiments. The experimental results were in a close agreement with the simulated results, which indicated the torqueangle characteristic was close to linear relationship and its amplitude increased with excited current. The simulated results don’t have hysteresis characteristics since it is a static electromagnetic simulation. And experimental curves show slight hysteresis, which are mainly due to magnetic hysteresis loops of soft magnetic materials and each static and dynamic frictions existing in the test rig. The maximum static torque reaches about 0.042N·m and the experimental frequency width can meet requirements of 2D proportional and directional valves. Therefore the proposed torque motor is appropriate to be an electromechanical converter of such applications. If proper heat treatment can be performed, the static and dynamic characteristics of torque motor will be further improved.