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差动变压器式位移传感器的结构简单,工作可靠,频带宽,时间常数小,灵敏度高,线性好,而被广泛应用。大行程高精度位移传感器,是指行程大于100mm精度优于0.2％的位移传感器。影响其精度因素主要有:传感器线圈结构设计、初级工作电流大小、激励电压频率高低、衔铁(通常称为铁芯)长短、线圈骨架结构和材料、外壳结构和材料、屏蔽结构和材料、拉杆材料的选取和处理工艺以及AC/DC转换形式、滤波电路等。本文着重研究非均匀磁场及磁化、初级激励电压频率高低对其精度的影响,从而提出大行程高精度位移传感器设计方法。
Differential transformer displacement sensor has the advantages of simple structure, reliable operation, wide frequency band, small time constant, high sensitivity and good linearity, and is widely used. Large stroke high-precision displacement sensor, the displacement is greater than 100mm displacement accuracy of better than 0.2% of the sensor. Affect the accuracy of the main factors: the structure of the sensor coil design, the size of the primary current, the excitation voltage frequency level, the length of the armature (usually called the core), the coil skeleton structure and materials, shell structure and materials, shielding structures and materials, rod material The selection and processing technology and AC / DC conversion form, filter circuit. This paper focuses on the non-uniform magnetic field and magnetization, the primary excitation voltage frequency on the accuracy of its impact, thus proposed large-stroke high-precision displacement sensor design method.