变频牵引电机端子过电压产生原理及影响因素  

Mechanism and Influencing Factors of Overvoltage on Inverter-Fed Traction Motor Terminal

作　　者：佟来生[1] 吴广宁[1] 温凤香[1] 

机构地区：[1]西南交通大学电气工程学院,四川成都610031

出　　处：《西南交通大学学报》2005年第5期673-676,共4页Journal of Southwest Jiaotong University

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：变频牵引电机端子过电压是导致电机绝缘损坏的主要原因.为解决此问题,采用行波传输线理论分析和等效电路仿真研究了过电压产生的原因及影响因素.研究结果表明,变频牵引电机端子过电压由脉冲上升沿时间和电缆长度共同决定,其幅值最大可达脉冲电压的1.9倍.采用并联R-C电抗器抑制电机端过电压,可使电机端过电压幅值下降到脉冲电压幅值的1.1倍.Overvoltage is one of the main causes of damage in the isolation of inverter-fed traction motors. To solve this problem, the mechanism and influencing factors were analyzed with the transmission line theory and simulation on the equivalent circuit. The analyses show that overvoltage is a function of the rise time of the converter output pulse and the lengths of the traction motor cables, and that its magnitude can be as large as 1.9 times of the pulse voltage. The magnitude can be decreased to 1.1 times of the pulse voltage with a shunt R-C reactor.

关 键 词：脉冲 变频牵引电机 过电压 原理 影响因素 

分 类 号：TM344.6[电气工程—电机]