轴流风机辐照电磁干扰计算方法与敏感频率研究

Calculation method and sensitive frequency of irradiation electromagnetic interference for axial flow fan

摘要

研究了轴流风机在电磁辐照环境下的感应电流特性及敏感频率问题。基于 Agrawal 传输线模型与 BLT 方程，通过绕组阻抗测试和建立等效电路模型，提出一种针对线缆端接非线性负载的感应电流频域解析计算方法，并利用数值方法验证了其计算精度和效率。通过对传输线敏感频率分析，发现在特定频率下传输线上感应电流会大幅增加，测试结果显示在 31 MHz 和 93 MHz 两个敏感频点轴流风机容易受到外界电磁波干扰。研究成果可为电子设备辐照电磁干扰预测和防护提供参考。

Abstract

This study investigates the induced current characteristics and sensitive frequency of axial flow fans under an electromagnetic irradiation environment. Based on the Agrawal model and BLT equations, a frequency-domain analytical calculation method of induced current for nonlinear loads is proposed through winding impedance measurement and equivalent circuit modeling. The accuracy and efficiency are also verified using numerical methods. By analyzing the sensitive frequency of the transmission line, it is found that the induced current increases significantly at specific frequencies. Test results show that the axial flow fan is susceptible to exterior electromagnetic interference at the sensitive frequency points of 31 MHz and 93 MHz. The research results can provide a reference for the prediction and protection from the irradiation of electronic equipment.

关键词

轴流风机 / 非线性负载 / 场线耦合 / Agrawal 传输线模型 / BLT 方程 / 敏感频率

Key words

axial flow fan / nonlinear load / field-line coupling / Agrawal model / BLT equation / sensitive frequency

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基金资助

国家自然科学基金(52175218)