变频调速交流牵引电机绝缘电老化机理的研究  

Investigation on Insulation Electrical Aging Mechanism of Inverter-Fed AC Traction Motors (Abstract of the Ph. D. Dissertation)

作　　者：佟来生[1] 吴广宁[2] 

机构地区：[1]南车集团株洲电力机车有限公司 [2]西南交通大学电气工程学院,四川成都610031

出　　处：《中国铁道科学》2008年第3期137-139,共3页China Railway Science

基　　金：国家自然科学基金资助项目(50377035);霍英东教育基金资助项目(91060)

摘　　要：Inverter-fed traction motors used in motor train unit are regarded as the research object for insulation electric aging mechanism,based on research productions of insulation technique of inverter-fed motors.High frequency equivalent circuit models of cable and stator winding are established to simulate over-voltage of motor terminals and uneven voltage distribution of windings.A novel high frequency high voltage test system has been developed to carry out life time tests of traction motor windings.Change tendency of dielectric loss,partial discharge and thermally stimulated current(TSC) are used to deduce insulation electric breakage mechanism.High frequency equivalent circuit models of cable and stator winding are established to simulate over-voltage of motor terminals and uneven voltage distribution of windings.The simulation results show that the over-voltage is the function of rise time,cable length and reflection ratio on motor terminals.Critical length and critical rise time is corresponding one to one.The over-voltage is up to the maximum value as long as the cable length is greater than the critical length.A novel high frequency high voltage test system has been developed in place of inverters to carry out insulation aging test.Pulse square waves are generated by IGBT and are enlarged by high frequency and high voltage transformers in the device.The maximum value of high frequency and high voltage square waves is up to 10 kV.The results of life tests of motor windings indicate that the relationship of insulation lifetime and the amplitude of pulses is the inverse power law model,the relationship of insulation lifetime and the frequency of pulses is exponential model under continuous pulses condition.When the test ambient temperature is below 200 ℃,the temperature has little influence on insulation lifetime of magnet wire with polyimide corona resistant film insulation.A novel partial discharge detection device was developed by impulse current sensor,oscillograph and computer.According to the characterisInverter-fed traction motors used in motor train unit are regarded as the research object for insulation electric aging mechanism, based on research productions of insulation technique of inverter-fed motors. High frequency equivalent circuit models of cable and stator winding are established to simulate over-voltage of motor terminals and uneven voltage distribution of windings.

关 键 词：电机绝缘 交流牵引 变频调速 老化机理 等效电路模型 电压分布特性 研究成果 绝缘技术 

分 类 号：U260.13[机械工程—车辆工程] TM307.1[交通运输工程—载运工具运用工程]