基于等效阻抗的铁心磁导率小信号测量及分析  

Small signal measurement and analysis of core permeability based on equivalent impedance

作　　者：王瑞田[1] 刘晴晴 张新生 李鑫 WANG Ruitian;LIU Qingqing;ZHANG Xinsheng;LI Xin(National Key Laboratory of Electromagnetic Energy,Naval Univ.of Engineering,Wuhan 430033,China)

机构地区：[1]海军工程大学电磁能技术全国重点实验室,武汉430033

出　　处：《海军工程大学学报》2024年第2期32-36,42,共6页Journal of Naval University of Engineering

基　　金：国家自然科学基金资助项目(51707200)。

摘　　要：现有软磁材料磁特性测试设备通常针对带材或者圆环形标准试样,对于大容量变压器或电抗器的铁心磁特性测量则需要搭建测试平台,用时域法测量铁心磁导率。LCR电桥小信号测试方法相比于时域法可以较为方便地测量变压器铁心激磁电感,进而在一定程度上评估铁心磁导率。因此,基于测试回路的等效电路,对比分析了LCR电桥开路电压模式、恒电压模式、恒电流模式3种工作模式下磁导率的测量原理和铁心磁化曲线工作点,总结了基于LCR电桥的铁心磁导率小信号测试方法的适用范围,针对非晶铁心试样开展了浸漆前后磁导率的对比测试。研究结果表明:LCR电桥小信号测试方法相比于时域法,测试步骤更简单便捷,适用于批量化变压器或者电抗器的铁心一致性测试。Existing equipment for testing the magnetic properties of soft magnetic materials is designed for strip and ring shape specimens.The test platforms are constructed when measuring the magnetic properties of the cores of large volume transformers or inductors.The core permeability is then measured using the time domain method.The excitation inductance is measured using a small-signal measurement by the LCR meter to assess the transformer core permeability more conveniently than using the time domain method.Based on the equivalent circuit in the test loops,the principle of measuring the permeability and magnetization curves of the operating points in open-circuit voltage mode,constant voltage mode and constant current mode of LCR meter were compared and analyzed.The test scope of a small-signal LCR meter for core permeability testing was summarized.Magnetic permeability in amorphous iron before and after painting was compared and tested by a small-signal measurement.The results of the study show that the small-singnal LCR meter measurement method is simpler and more convenient than the time domain method,and is suitable for core consistency testing of bulk transformers or reactors.

关 键 词：时域法 磁导率 激磁电感 LCR电桥 

分 类 号：TM432[电气工程—电器]