新型电液伺服阀直线力马达的研究

发布时间：2018-05-24 18:46

本文选题：动圈式 + 直线力马达　；参考：《兰州理工大学》2012年硕士论文

【摘要】：电液伺服控制系统综合了电气和液压两方面的优点，具有控制精度高、响应速度快、信号处理灵活、输出功率大、结构紧凑、重量轻等优点。目前的液压伺服系统中，以力反馈双喷嘴挡板两级电液伺服阀和直接位置内反馈两级滑阀式电液伺服阀应用较广。比起力反馈双喷嘴挡板两级电液伺服阀来说，内反馈两级滑阀式电液伺服阀结构简单，加工精度相对低，对油的清洁度要求不高，因而工作可靠。但因为直接位置内反馈两级滑阀式电液伺服阀的动圈式直线力马达的质量比较大，影响了阀的固有频率和动态性能，导致其性能较差，频宽一般为30-70Hz，只能用于要求不高的场合。本文对电液伺服控制系统中的直接位置内反馈两级电液伺服阀内的动圈式直线力马达进行改进，通过对传统动圈式直线力马达的永磁体放置方法及其永磁体磁化方向进行分析，发现磁力线分布不均匀，磁通密度低，，而且与线圈电流方向不垂直。在现有的技术基础上，本文提出根据磁力线方向的异同在轴向放置三组线圈，形成一种新型五环型Halbach磁化阵列动圈式直线力马达。静态磁场与动态特性的仿真结果表明，新型直线力马达产生的电磁力提高2.5倍左右,阶跃响应时间为6ms，频宽达到277Hz。
[Abstract]:The electro-hydraulic servo control system has the advantages of high control precision, fast response speed, flexible signal processing, large output power, compact structure and light weight. In the present hydraulic servo system, the force feedback double nozzle baffle two stage electro-hydraulic servo valve and the direct position feedback two stage slide valve type electro-hydraulic servo valve are widely used. Compared with the two-stage electro-hydraulic servo valve with double-nozzle baffle with force feedback, the internal feedback two-stage slide valve has simple structure, low machining precision and low cleanliness of oil, so it works reliably. However, because of the high quality of the moving coil linear force motor of the direct position feedback two-stage slide valve type electro-hydraulic servo valve, which affects the inherent frequency and dynamic performance of the valve, the performance of the motor is poor, and the frequency width is generally 30-70 Hz, which can only be used in the situation where the requirement is not high. In this paper, the direct position feedback in the electro-hydraulic servo control system is improved. The method of permanent magnet placement and the magnetization direction of the permanent magnet are analyzed through the improvement of the moving coil linear force motor in the two-stage electro-hydraulic servo valve. It is found that the distribution of the magnetic field line is uneven, the flux density is low, and it is not perpendicular to the current direction of the coil. On the basis of the existing technology, three sets of coils are placed in the axial direction according to the difference of the direction of the magnetic force line to form a novel five-ring Halbach magnetized array moving-coil linear force motor. The simulation results of static magnetic field and dynamic characteristics show that the electromagnetic force generated by the new linear force motor is increased about 2.5 times, the step response time is 6 Ms, and the frequency width is up to 277 Hz.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH137.52

【引证文献】