简要介绍了电磁兼容, 电磁干扰、电磁屏蔽的基本内容。主要论述了机箱盖的屏蔽效能以及机箱连接缝隙处屏蔽效能的计算方法, 分析了影响机箱屏蔽效能的主要因素, 给出了提高机箱屏蔽效能的主要措施, 最后通过对某控制器机箱的实例分析, 验证了提高机箱缝隙屏蔽效能措施的可靠性。在进行电磁屏蔽设计时需综合考虑影响电磁屏蔽的各影响因素才能达到较好的屏蔽效果。

The basic contents of electromagnetic compatibility, interference and shielding are introduced briefly. The shielding effectiveness of the chassis cover and the calculation method of shielding effectiveness of the chassis connection gap are discussed. The main factors influencing the shielding effectiveness of the chassis are analyzed. The main measures to improve the shielding effectiveness of the chassis are proposed. Based on an analysis of a control chassis, the reliability of the measures improving the shielding effectiveness of the chassis gap is verified. In the design of electromagnetic shielding, it is necessary to comprehensively consider the various influencing factors which can influence the electromagnetic shielding, so a better shielding effect can be achieved.