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Design consideration on the torque sensor for intelligent mechanical systems

智能机械系统扭矩传感器的设计考虑

基本信息

批准号：
07455173
负责人：
SASADA Ichiro
金额：
$ 5.38万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455173/
关键词：
torque sensor magnetoelastic effect hysteresis magnetic head figure of eight coil steel shaft carburization magnetic anisotropy probe 磁気ひずみ平面コイル

项目摘要

In order to develop a magnetostrictive torque sensor using a steel shaft, factors affecting the accuracy of the sensor, such as magnetic inhomogeneity at the surface of the shaft which causes zero-level-fluctuation with shaft rotation and hysteresis in the input-output relationship, are investigated for several promising steel shaft svailable commercially. We examined, using magnetic heads with figure of eight coils, nickel-chromium-molybdenum steel shafts such as SNCM420, SNCM616 and SNCM447, and chromium-molybdenum steel shafts SCM420. The sensitivity was highest with SNCM616 and then SNCM420/SNCM447 following this, finally SCM420 when these shafts were casehardened. The input-output hysteresis is analyzed for the magnetostrictive shaft torque sensor with phase-sensitive-detection. We describe a method of tuning operating condition of the torque sensor to obtain zero hysteresis for a class of the steel shaft. We found that the lowest hysteresis was obtained with a carburized SNCM420 shaft at the excitation condition of 60 kHz 0.3 A.The linearity measured with this shaft was as good as 0.8% (full scale=1000 Nm for a shaft of 25 mm in diameter). The zero-level-fluctuation of the torque sensor using SNCM420 carburized shaft was (]SY.+-。[)1.3% (full scale). We further established a method to select a proper steel shaft yielding zero hysteresis.We also developed a method of imaging surface anomaly using a miniaturized magnetic anisotropy probe. Using this, we found helical patterns of inhomogeneities at the surface of unheat-treated shafts which were probably induced during a final stage of steel bar manufacturing process.

为了研制磁致伸缩式扭矩传感器，针对几种有市场前景的钢轴，研究了影响传感器精度的因素，如轴表面磁场的不均匀性（引起轴旋转时的零电平波动）和输入输出关系中的磁滞现象。我们使用8字形线圈磁头，对SNCM 420、SNCM 616和SNCM 447等镍铬钼钢轴和SCM 420铬钼钢轴进行了检测。SNCM 616的灵敏度最高，然后是SNCM 420/SNCM 447，最后是SCM 420，当这些轴表面硬化时。分析了磁致伸缩相敏轴扭矩传感器的输入输出迟滞特性。我们描述了一种方法，调整的扭矩传感器的工作条件，以获得零滞后的一类钢轴。我们发现，在60 kHz 0.3 A的激励条件下，用渗碳SNCM 420轴获得最低的滞后。用该轴测量的线性度为0.8%（全刻度=1000 Nm，直径为25 mm的轴）。采用SNCM 420渗碳轴的扭矩传感器的零电平波动为（±）SY. [)1.3%（满刻度）。我们进一步建立了一个方法来选择一个合适的钢轴产生零滞后。我们还开发了一种方法，使用一个小型化的磁各向异性探头成像表面异常。利用这一点，我们发现螺旋图案的不均匀性在未经热处理的轴，这可能是在钢棒制造过程的最后阶段引起的表面。