摘要
通过分析雨刮电机电磁辐射干扰的原理,将问题简化为雨刮电机供电线束的辐射干扰,进而建立雨刮电机的整车电磁辐射模型。将电机线束模拟为离散化的传输线集总参数模型,计算出的线束电流分布作为线束辐射的激励源,利用有限积分法研究其辐射特性。结果发现,雨刮电机电磁辐射干扰对车载天线和收音机的影响明显。而相应的电磁辐射抑制措施仿真结果表明,减小电机的接触电阻对降低线束辐射强度的效果不明显;对线束进行共模/差模电容滤波,抑制效果较好,尤其是共模电容滤波更为有效;在共模电容滤波基础上串联电感,构成低通滤波器,可进一步降低线束辐射。参照仿真结果对实车辐射测试超标的雨刮电机进行电磁辐射的改进,在其线束上加入低通滤波器后,电磁辐射干扰显著降低,测试达标。
Through the analysis on the principle of electromagnetic radiation interference （EMI） of wiper motor, the issue is simplified into the radiation interference of its wiring harness, and then a vehicle model for the e-lectromagnetic radiation of wiper motor is established. The wiring harness is simulated as discretized transmission line model with lumped parameters, to calculate its current distribution as the exciting source of wiring harness and its radiation characteristics is investigated by using finite integration technique. The results show that the electromag- netic interference of wiper motor has obvious influences on the antenna and radio in vehicle. The results of simula-tion on the corresponding EMI suppression measures indicate that for suppressing the radiation intensity of harness, the reduction in contact resistance of wiper motor has no apparent effects, while the common-mode/differential-mode capacitor filtering have better effects, in particular the former, and adding series inductance on the base of common- mode capacitor filtering to form a low-pass filter can further reduce harness radiation. With this result as reference, a modification for EMI is conducted on the wipe motor of a real car, whose radiation exceeds the standard limit, by adding low-pass filter, leading to significant reduction in EMI and hence meeting the requirements of regulation.
出处
《汽车工程》
EI
CSCD
北大核心
2012年第10期937-942,共6页
Automotive Engineering
基金
重庆市科技攻关项目(CSTC
2009AB6039)资助
关键词
雨刮电机
传输线模型
电磁辐射
干扰
wiper motor
transmission line model
electromagnetic radiation
interference
