灌封胶固化工艺对传感器元器件焊点热应力影响的研究  

Research on the Influence of Curing Process of Potting Adhesive on Thermal Stress of Sensor Components Solder Joints

作　　者：柯飙 吕阳 刘丹 张燕亮 郑华雄 金波 KE Biao;LV Yang;LIU Dan;ZHANG Yanliang;ZHENG Huaxiong;JIN Bo(Ningbo CRRC Times Transducer Technology Co.,Ltd.,Ningbo 315021,China)

机构地区：[1]宁波中车时代传感技术有限公司,浙江宁波315021

出　　处：《传感器世界》2023年第6期1-7,共7页Sensor World

基　　金：国家重点研发计划(No.2021YFB3203200)。

摘　　要：文章首先对灌封型速度传感器故障问题开展分析,识别产品失效的原因是内部电气元部件焊点疲劳开裂,从机理层面定性焊点开裂的主要原因是焊点与周围材料的热膨胀系数不匹配;随后开展灌封胶固化工艺研究,定性对比不同固化工艺下灌封胶的性能差异;同时,结合现车实际运营环境,识别高速动车组转向架电机非传动端的温度载荷工况,通过有限元分析,对不同固化工艺下传感器内部焊点开展热应力分析,评估产品全寿命周期疲劳损伤,预测焊点的疲劳寿命;最后,通过试验验证了采用灌封胶高温固化工艺可有效提高灌封型速度传感器可靠性。Firstly,the paper analyzed the fault problem of potting type speed sensor,identified that the cause of product failure was the fatigue cracking of solder joints of internal electrical components,and located the main cause of solder joint cracking from the mechanism level was the mismatch of thermal expansion coefficient between solder joints and surrounding materials.Subsequently,the curing process of potting adhesive was studied,and the performance differences of potting adhesive under different curing processes were qualitatively compared.At the same time,combined with the actual operating environment of the vehicle,the temperature load conditions of the nontransmission end of the bogie motor of the high-speed EMU are identified.Through the finite element analysis,the thermal stress analysis of the internal solder joints of the sensor under different curing processes was carried out to evaluate the fatigue damage of the product life cycle and predict the fatigue life of the solder joints.Finally,it was verified by experiments that the high temperature curing process of potting adhesive can effectively improve the reliability of potting speed sensor.

关 键 词：传感器 灌封材料 固化工艺 热应力 疲劳寿命 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]