飞机电刹车系统电磁干扰产生机理及抑制方法  

Mechanism for Electro-Magnetic Interference in an Aircraft′s Electric Braking System and Its Suppression Method

作　　者：相里康[1] 马瑞卿[1] 张庆超[1] 韩伟健[1] 邓钧君[1] 

机构地区：[1]西北工业大学自动化学院,陕西西安710072

出　　处：《西北工业大学学报》2015年第6期994-1000,共7页Journal of Northwestern Polytechnical University

摘　　要：针对飞机电刹车系统力传感器信号上叠加有高幅干扰这一问题,通过对电刹车系统分析,认为电机三相电流以及机电作动控制器(EMAC)输出PWM波为主要干扰源,电缆线路之间的耦合干扰是造成干扰的主要原因。建立了线路耦合干扰的数学模型,并据此采用电磁屏蔽、线路绞合和有效接地来减少线路耦合,并在EMAC输出端设计了无源EMI滤波器。通过这些改进,极大地减弱了干扰,提高了系统电磁兼容性,保证了刹车力伺服系统正常工作。This paper deals with the problem that the signals of the force sensor of an aircraft＇s electric braking sys- tem are superimposed with high-amplitude interference. The analysis of the electric braking system shows that the three-phase current of its motor and the pulse width modulation （PWM） wave output by the electro-mechanical ac- tuator controller （EMAC） are the primary sources of interference and that the coupling interference between cable lines is the main cause of the interference of signals of the force sensor. The mathematical model of coupling inter- ference between cable lines is established, according to which the transmission cable is designed and the line cou- pling was reduced by using electromagnetic shielding, line twisting and effective grounding. A passive electromag- netic interference （EMI） filter is designed for the output end of the EMAC. Through these improvements, the inter- ference superimposed on the force sensor is greatly reduced. The paper also improves the electromagnetic ＇, compati-bility of the electric braking system and ensures that the braking force servo system works normally.

关 键 词：飞机 电刹车系统 电磁干扰 传输电缆 EMI滤波器 

分 类 号：V242.4[航空宇航科学与技术—飞行器设计]