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集磁式OCS磁特性随温度变化的研究

, PP. 45-55

Keywords: 光学电流传感器,温度,Jiles-Atherton模型,磁滞回线,集磁环,铁磁材料,气隙

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Abstract:

温漂问题是制约集磁式光学电流传感器实用化的瓶颈之一,目前研究集中在光学器件温度特性分析与补偿方面,缺乏对传感头磁特性随温度变化的分析。实际应用中磁导率和气隙长度随温度变化,使气隙磁场强度改变并影响测量准确度,因此有必要对传感头磁特性随温度变化情况进行分析。本文分析了铁磁材料磁滞回线随温度变化的情况,并在J-A模型的基础上建立带温度系数的磁滞模型;提出热膨胀系数和磁致伸缩系数的近似表达式,修正了热膨胀和磁致伸缩对气隙长度的影响;最后建立集磁环附加温度参数和气隙参数的磁滞模型,分析磁特性随温度变化情况。基于该模型提出一种具有稳定温度特性的传感头设计方法,以铁基非晶合金为例进行了仿真和实验验证,二者结果吻合,证明了模型和设计方法的有效性。

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