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本文分析了直流串励牵引电动机的数学模型,讨论了磁饱和的影响,给出了数字仿真的差分方程,最后化简得出“直流串励牵引电动机可用一个可变电阻替代”的结论。另外,本文通过理论分析和一系列实验找出了同步牵引发电机转速、负载阻抗、磁饱和对电机动态特性的影响,并给出了电机动态特性简便的测试方法。
In this paper, the mathematical model of DC traction windings motor is analyzed, the influence of magnetic saturation is discussed, and the difference equation of digital simulation is given. Finally, the conclusion that “a variable resistor can be replaced by DC traction windings motor” is simplified. In addition, the paper analyzes the influence of the synchronous traction generator speed, load impedance and magnetic saturation on the dynamic characteristics of the motor through theoretical analysis and a series of experiments, and gives a simple and convenient test method of the motor dynamic characteristics.