交流接触器温度场仿真及影响因素的分析

Temperature Field Simulation of AC Contactor and Analysis of Its Influence Factors

通过对交流接触器的热学分析,考虑接触器内部传导散热和外表面的对流和辐射散热,建立了接触器的稳态热分析模型。采用非线性瞬态磁路法计算电磁系统线圈和分磁环的功率损耗;考虑回路电阻、动静触头接触电阻、接线端以及连接导线的发热作用,利用热电耦合分析主回路的温度分布;基于流体相似理论和Stefan-Boltzmann定律计算接触器表面散热系数。用三维有限元方法对一额定电流为100A的交流接触器温度场进行了仿真分析,并进行了实验验证。应用此热分析模型对主回路接线端拧紧力、主触头弹簧终压力以及连接导线截面对接触器温度场的影响进行了研究,为接触器的设计和优化提供了依据。

Based on the analysis of heat transfer process in alternating current （AC） contactor, a thermal model of contactor is proposed in this paper. The conduction in the contactor and the convection and radiation around the exterior surfaces are considered in the model. The transient magnetic circuit method is adopted to calculate the heat generated by the winding and the shading coils. The temperature distribution of the main circuit is calculated by the thermal-electric coupling method, considering the resistance of conducting path, the contact resistance of main contact, the wiring terminals and the feedings. The theory of similarity for fluid and the Stefan-Boltzmann law is applied to calculate the heat transfer coefficient. The temperature field of an AC contactor with nominal current of 100A is simulated. And the results are verified by experiments. Based on the model, the influence of the screw force acting on the wiring terminals, the force of main contact spring and the section area of feedings on the temperature rise are researched. The results are useful in designing and optimizing AC contactor.