Study Of Parallel Operation Work Characteristic Of AC Traction Motor In Railway Transportion

In the field of railway vehicles' AC driving, 3 phases asynchronous motor is often used as driving motor. Main circuit that many paralleled asynchronous driving motors supplied by one inverter can be found everywhere. Because of the 'hard' characteristic of the 3 phase asynchronous motor, the differences of motor characteristics and wheel diameter greatly affect the appliance of the load of the paralleled motors. But the bias of power apply is a big problem for paralleled motors. As a result, the research of this problem is of great value for the AC driving motors development and railway vehicles locomotives' maintenance.This thesis analyzed the bias of power supply of the asynchronous driving motors in paralleled working status. Evaluation options have been proposed in the thesis, and several concrete assessment methods have also been provided. These plans have been proved correct and realized on the AC exchange experiment bench. When measuring the parameters of AC motors, there are a lot of harmonic wave of voltage and current, and they are difficult for datum processing. In this thesis, datum has been processed by Chirp Z transformation and ellipse filtering. The datum acquainted by the system is coincided with the actual results and the method is feasible. An evaluation way for motor characteristics has been proposed and research of motors match and selection in the procedural of locomotive check.This paper presents experimental evidence for paralleled asynchronous driving motors' power imbalance and proves the evaluation method practical, the electrical characteristics of different evaluation methods properly. The method of motors' selection and matching is suitable for the factory and motor maintenance.