车体过电压对动车组轴端速度传感器的影响机理

Impact Mechanism of EMU Body Overvoltage on the Shaft End Speed Sensor

针对动车组在运行过程中因速度传感器被干扰导致车门无法开启的故障,分析了速度传感器发生电磁干扰的原因,建立和验证了速度传感器的电磁耦合仿真模型,采用仿真模型研究了车体浪涌过电压幅值、信号传输电缆长度及屏蔽层串联电容对速度传感器电磁干扰的影响。研究结果表明,速度传感器的电磁干扰与车体浪涌过电压幅值、信号传输电缆长度和屏蔽层串联电容成正相关,其中车体浪涌过电压幅值的变化对速度传感器产生的电磁干扰影响最大。研究结论为速度传感器的电磁干扰深化研究提供了参考依据。

In view of the open door failure caused by the disturbed speed sensors during EMU operation,the electromagnetic interference of speed sensors is analyzed.Then,an electromagnetic coupling simulation model of the speed sensor is established,verified and used to study the impact of the amplitude of vehicle body surge voltage,the length of signal transmission cable,and the series capacitance of signal transmission cable shielding layer on the electromagnetic interference of speed sensor.The results show that the electromagnetic interference of speed sensor is positively related to the amplitude of the surge voltage,the length of the signal transmission cable and the series capacitance of the shielding layer,in which the variation of the surge voltage amplitude of the vehicle body has the greatest impact on the electromagnetic interference produced by speed sensor.The conclusion of this research provides a reference for further researches on the electromagnetic interference of speed sensor.