复励牵引电动机控制的几个问题

复励牵引电动机便于实现无级磁场削弱,控制简单,并可减少晶闸管元件数量。但复励牵引电动机在控制上也带来一些新问题:如需要预励磁;为使并联牵引电动机间的负荷分配均匀,需要采取特别措施;牵引时串励和他励的调节方式,以避免产生振荡;制动力的控制方式及在低、中速区实现较大制动力的问题。本文就这些问题提出了解决的途径。

Problems in Controlling Compound Tractin Motor

By using compound traction motor, it is easier to realize stageless field weakening with simple control and less thyristor devices, but it brings with it some new problems in the control such as the need for pre-excitation and for special measures to evenly distribute the load between parallel traction motors. How to regulate serial and seperate excitation so as to avoid oscillation, how to control the braking force and how to generate greater braking force during low and medium speed operation of locomotives are also among the problem. This article gives the solution to all the above-mentioned problems.