电磁发射用直线感应电机位置检测系统关键技术研究

Study on Key Technology of Position Measurement System for Linear Induction Motor Applied in Electromagnetic Emission System

电磁发射用直线感应电机采用基于传感器阵列的位置检测系统。该系统以电感式接近开关作为位置传感器并构成传感器阵列,通过电涡流效应感应动子运动并生成相应位置信号。利用位置算法对位置信号进行计算可以实时准确地得到动子位置。设计了位置检测系统的基本原理和拓扑结构,提出系统的参数设计方法。深入研究位置传感器的工作机理,建立传感器内部参数与输出特性的数学模型,分析了适用于电磁发射工况的传感器参数条件。进行位置传感器的性能测试,并在此基础上研制了实际的位置检测装置。通过实际发射平台验证,所设计的位置传感器和位置检测系统能够较好地实现电磁发射特殊工况下的动子位置测量并顺利完成发射任务。

Position measurement system based on sensor array is applied to linear induction motor used in electromagnetic emission. Inductive proximity switches are assembled as position sensor array in the system. The movement of rotor is detected by eddy-current effect between the sensor and the eneoder on the rotor, and position signals are produced by the sensor array. By calculating the position signals, rotor position is acquired instantaneously and accurately. Principle and network topology of the position measurement system was designed. Parameter design method of the system was proposed. Further study on the position sensor was carried out. A mathematical model was built to describe the relationship between the circuit parameters and the performance of the sensor. Strategy to optimize the parameters of the sensor was proposed to make the sensor suitable for the position measurement system. Practical position measurement system was built with qualified position sensors. Through the experiments on the practical emission system, the proposed position measurement system is competent for the electromagnetic emission.