差动式非晶态合金带扭矩传感器

• 作 者: 王绪威 刘广玉
• 机 构: 北京航空学院,北京航空学院
• 出 处: 传感器技术
• 发表日期: 1987年01期
• 关键词: 扭矩传感器 非晶态合金 晶带 差动式 非接触检测 新型传感器 磁各向异性 磁致伸缩系数 扭杆 饱和磁化强度

本文对一种利用应力敏感非晶态合金带的新型传感器—扭矩传感器的发展作了综合论述。这种新型传感器是以磁致伸缩效应为基础来检测扭矩的,为非接触检测。在这种传感器中,两应力—敏感非晶态合金带粘贴在扭杆上,扭杆作为转轴的一部分。在每一敏感带中产生一单轴磁弹性的磁各向异性,两带中的易磁化轴方向与转轴成对称关系。利用一交流偏置场,通过所加扭矩在两非晶带所形成的导磁率差来检测扭矩。非晶带所用合金是Fe-Si-B系,其饱和磁致伸缩系数λ_s 24×10~(-6),饱和磁化强度I_s 1.5T。

In this paper, a new type of sensor using stress-sensitive amorphous alloy ribbon - the development of torque sensors are discussed. The new sensor is based on the magnetostrictive effect to detect torque, non-contact detection. In this sensor, two stress-sensitive amorphous alloy strips are attached to the torsion bar as part of the shaft. In each of the sensitive bands, a uniaxial magneto-elastic anisotropy occurs, and the easy axis of magnetization in the two bands is in a symmetrical relationship with the axis of rotation. Using an AC bias field, the torque is detected by the difference in permeability of the applied torque between the two amorphous ribbons. The alloy used in the amorphous zone is Fe-Si-B, with a saturation magnetostriction coefficient λ_s 24 × 10 -6 and a saturation magnetization I_s 1.5T.