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 tradi- tional 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 magnetore- sistive 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 measure- ment system of the tunnel reluctance speed.
出处
《传感技术学报》
CAS
CSCD
北大核心
2017年第5期692-696,共5页
Chinese Journal of Sensors and Actuators
基金
总装预研基金项目
国家自然基金项目(61571405)
关键词
转速测量
隧道磁阻传感器
反正切
环形磁栅
rotational speed measurement
TMR sensor
anyway cut
toroidal magnetic gate.
