基于隧道磁阻效应的反正切转速测量方法

发布时间：2018-02-24 11:50

本文关键词： 转速测量隧道磁阻传感器反正切环形磁栅　出处：《传感技术学报》2017年05期 　论文类型：期刊论文

【摘要】：针对传统转速测试系统精度低、温度稳定性差、测量范围窄等问题,提出一种基于隧道磁电阻(TMR)效应的高性能转速测试系统。在没有误差校正的情况下实现了0.19°的位置检测精度,已经达到了工程应用中常见的2 000线编码器精度。本方法在被测转轴上布置磁栅环,利用具有高分辨率高频响特性的隧道磁电阻传感器对磁栅微弱磁场变化进行检测,得出频率随转速变化的正余弦信号。实验分别采用定时测角法、定角测时法和反正切法计算转速,结果表明3种算法中反正切算法检测精度最高,可达1.25%,更适合于隧道磁阻转速测量系统。
[Abstract]:Aiming at the problems of low precision, poor temperature stability and narrow measuring range of traditional rotational speed measuring system, A high performance rotational speed measurement system based on tunneling magnetoresistance (TMR) effect is proposed. The accuracy of position detection is 0.19 掳without error correction. The accuracy of 2 000 line encoder has been achieved in engineering application. In this method, the magnetic gate ring is arranged on the measured axis, and the weak magnetic field change of the magnetic gate is detected by the tunnel magnetoresistance sensor with high resolution and high frequency response characteristic. The frequency of sine cosine signal varying with rotational speed is obtained. The rotation speed is calculated by timing angle measurement method, constant angle measurement method and inverse tangent method respectively. The results show that the detection accuracy of the algorithm is the highest among the three algorithms. Can reach 1. 25, more suitable for the tunnel reluctance speed measurement system.
【作者单位】：中北大学电子测试技术国家重点实验室;中北大学仪器科学与动态测试教育部重点实验室;中北大学微系统集成研究中心;
【基金】：总装预研基金项目国家自然基金项目(61571405)
【分类号】：TH824.1;TP212

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