基于隧道磁阻效应的反正切转速测量方法
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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。
In view of the problems of low precision,low temperature stability and narrow measurement range of traditional rotating speed test system,a high performance test system based on the effect of tunnel magnetic resistance( TMR) is proposed. In the case of no error correction,the accuracy of 0.19 degree position detection has been achieved. This method has reached the 2 000 line encoder accuracy in engineering applications. In this method,the magnetic ring is arranged on the shaft to be measured,and the magnetic field is detected by the tunnel magnetoresistive sensor with high resolution and high frequency response. The sine and cosine signals with the frequency change with the speed are obtained. In this paper,we use the method of the timing angle measurement method,the fixed angle time measurement method and the arc tangent methodto calculate the rotation speed. The results show that the arctangent algorithm has the highest detection accuracy of 1.25%,which is more suitable for the measurement system of the tunnel reluctance speed.
In view of the problems of low precision,low temperature stability and narrow measurement range of traditional rotating speed test system,a high performance test system based on the effect of tunnel magnetic resistance( TMR) is proposed. In the case of no error correction,the accuracy of 0.19 degree position detection has been achieved. This method has reached the 2 000 line encoder accuracy in engineering applications. In this method,the magnetic ring is arranged on the shaft to be measured,and the magnetic field is detected by the tunnel magnetoresistive sensor with high resolution and high frequency response. The sine and cosine signals with the frequency change with the speed are obtained. In this paper,we use the method of the timing angle measurement method,the fixed angle time measurement method and the arc tangent methodto calculate the rotation speed. The results show that the arctangent algorithm has the highest detection accuracy of 1.25%,which is more suitable for the measurement system of the tunnel reluctance speed.
引文
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[2]尚剑宇,张晓明,黄建林,等.常规弹药转速测量时频分析方法研究[J].传感技术学报,2012,25(7):951-956.
[3]冯立峰.面向高精度伺服系统的磁电式编码器研究[D].哈尔滨:哈尔滨工业大学,2014.
[4]黎琦.基于磁性隧道结的齿轮传感器研究[D].兰州:兰州大学,2011.
[5]冯英翘,万秋华.小型光电编码器细分误差校正方法[J].仪器仪表学报,2013,34(6):1374-1379.
[6]乔栋,续志军,吴宏圣,等.绝对式光栅尺细分误差补偿方法[J].光学学报,2015,35(1):1-5.
[7]孟庆丰.基于GMR传感器的可辨向齿轮转速传感器的设计[D].杭州:杭州电子科技大学,2012.
[8]王琪,李孟委,王增跃,等.基于隧道磁阻传感器的三维电子罗盘设计[J].传感技术学报,2015,28(6):895-899.
[9]Xu Jian,Zhang Gengshi,Li Benyin.Engine Revolution Speed Measurement Method Based on Single-Point Virtual Vibration Power[J].Chinese Journal of Scientific Instrument,2014,35(3):697-702.
[10]Wang Xianjun.Errors and Precision Analysis of Subdivision Signals for Photoelectric Angle Encoders[J].Optics and Precision Engineering,2012,20(2):379-386.
[11]叶菁.多功能转速测量仪的研制[D].天津:天津大学,2012.
[12]Jiang Lixian,Hiroshi Naganuma,Mikihiko Oogane,et al.Large Tunnel Magnetoresistance of 1 056%at Room Temperature in Mg O Based Double Barrier Magnetic Tunnel Junction[J].Applied Physics Express,2009(2):083002.