【摘要】 常导高速磁悬浮的平稳运行依赖于其车载电磁铁的稳定工作，而电磁铁在工作时存在难以散热的问题。制备应用于电磁铁绝缘层的新型PI材料，测试得到其具有较高的导热系数0.41 W/(m·K)。建立常导磁悬浮列车的电磁铁有限元模型，通过仿真软件计算出PEN绝缘层电磁铁和新PI材料绝缘层电磁铁在不同速度和不同工况下的温升及温度场分布，结果表明，若电磁铁使用2种更高导热系数的PI-A和PI-B材料，其最高温度分别降低37.25%和38.85%。高导热系数的绝缘层能够明显降低工作时电磁铁内部温度及积热问题，从而提升电磁铁在正常运行时的稳定性，可避免电磁铁因长期过热材料老化导致的频繁检修更换等问题。更多还原

【Abstract】 The stable operation of EMS high-speed maglevs relies on the stability of on-board electromagnets, but electromagnets have the problem of difficultly dissipating heat when they are conducting relatively high electric currents. In this paper, a new PI material for electromagnets insulation was made and tested, with a higher thermal conductivity of 0.41 W/(m·K). A 2D finite element model of the electromagnet was established. Under different speeds and working conditions of an EMS high-speed maglev, the temperature rise and temperature distribution for PEN insulated electromagnets and new PI insulated electromagnets were simulated. The results show that in the cases of two new insulation layers(PI-A and PI-B) used with higher thermal conductivity, their respective maximum temperatures can be reduced by 37.25% and 38.85%. High thermal conductivity insulation can reduce the temperature rise of electromagnets and relieve heat accumulation problem, improve the stability of the electromagnet, and potentially avoid the frequent maintenance and replacement of electromagnets due to long-term overheating and material aging.更多还原