汽车继电器触点瞬态接触行为分析及数值模型建立

Analysis of Transient Contact Behavior of Automotive Relay Contacts and Establishment of Numerical Model

继电器是车辆电器控制的一种重要元器件,其工作环境是瞬间大电流通过周期性闭合的触点,由于接触触点间接触电阻在闭合瞬间大电流的作用下产生焦耳热,导致触点极易发生熔焊的可能,严重影响继电器的使用性能,危害行车安全。继电器触点间接触行为是影响其接触电阻的关键因素。为此,本文基于Greenwood-Williamson模型建立接触力学数值模型,为探析触点间瞬态接触电阻奠定基础,为继电器热防护机构的设计及可靠性评估提供参考。

Relay is an important component of vehicle electrical control.Its working environment is that momentary high current passes through periodically closed contacts.The contact resistance between contacts generates heat under the action of the large current at the moment of closing,which leads to contact.It is extremely prone to fusion welding,which seriously aff ects the performance of the relay and endangers driving safety.The contact behavior between relay contacts is a key factor aff ecting its contact resistance.For this reason,this paper establishes a numerical model of contact mechanics based on the Greenwood-Williamson model,which lays a foundation for the analysis of transient contact resistance between contacts,and provides a reference for the design and reliability evaluation of the relay thermal protection mechanism.