FeCuNbSiB单纳米晶磁芯双绕组新型电流传感器理论分析

炉内等温退火法制得的纳米晶合金F e73.5Cu1N b3S i13.5B9环形磁芯,由于在退火过程中材料内应力得以充分驰豫释放,使其具有高的磁性能温度稳定性及高的磁灵敏度,特别适合于制作对微弱电流进行测量的传感器。利用纳米晶合金材料作为敏感材料,提出了采用单纳米晶磁芯双绕组结构,多谐自振荡励磁,可进行非接触检测微弱电流的新型传感器。建立了传感器的数学模型,从理论上分析了传感器工作原理,该理论与实验结果很好地吻合。并利用傅里叶变换对桥路输出信号进行分析,指出了传感器信号调理电路的设计方法。

Theoretical Analysis of Novel Weak Current Sensor Using FeCuNbSiB Single Nanocrystalline Torodial Core and Double-winding

Fe_(73.5)Cu_1Nb_3Si_(13.5)B_9 nanocrystalline toroidal core made by isothermal furnace annealing shows good thermal stability of magnetic properties and excellent soft magnetic properties due to the internal stresses of the core fully released during the annealing process.Based on the feature of the magnetic core,a novel non-contact type weak current sensor adopted single nanocrystalline core and double-winding excited by multivibrator bridge was proposed.The measuring principles for static current were given in theory by established mathematic model of the sensor.The theory is in good agreement with the experimental results and it indicated clearly the key factors affecting performance parameters for the sensor.The multivibrator bridge output signal was analyzed by Fourier transform.Furthermore according to the theoretical analysis results,the method for designing the signal conditioning circuit was introduced.