为了研究高频方波脉冲电压下高速铁路牵引电机绝缘的老化、失效机理,给电机绝缘结构的设计和优化提供理论基础,本文研究了高频方波脉冲下牵引电机定子绝缘的老化特性.在高频方波脉冲下,对普通和纳米复合薄膜进行了老化,通过扫描电镜分析了试样表面形貌的变化情况,并对试样的剩余击穿场强进行了测试分析.研究表明:老化1小时后两种薄膜的表面形貌都发生了明显改变但变化不同,纳米粒子的添加延缓了局部放电对纳米复合薄膜的老化速率,老化2小时后普通薄膜和纳米复合薄膜的击穿场强分别下降了27.55％和12.90％.%To provide theoretical basis for design and optimization of traction motor insulation structure, an investigation of aging and failure mechanism of insulation materials under high frequency impulse voltage was carried out through inspecting aging characteristics of stator insulation under high frequency square impulse voltage. Electrical aging test was performed on the common and corona resistant polyimide (PI) films with different aging time under high frequency square impulse voltage. The dammage instance of polyimide films' surface was observed under scanning electron microscopy (SEM), and the residual insulation strength was measured and analyzed. Results show that after one hour time aging the surface morphology of the two polyimide film are changed distinctly, but the damage instances were completely different. Nano particles in the corona resistant film slow down the aging rate compared with that of common film. Residual dielectric strength of common and corona resistant polyimide films were reduced by 27. 55% and 12. 90% after two hours aging, respectively.
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