The Modeling and Simulating Research of Electrical Synchronization Speed-regulating System in Rolling Test-rig

The rolling test-rig is a sort of larger test apparatus, which can test electric locomotive´s pulling and braking performance scientifically. The principle of rolling test-rig is to simulate the same rail with four rail wheels, and rotational speed of four rail wheels must be completely consistent. Based on the following three factors: the pulling characteristic of SS8 electric locomotive, dynamic circuit model of DC motor operating in braking condition, and control model of electric drive system, this paper has built a transfer function model of exciting current single closed-loop electrical synchronization speed-regulating system in rolling test-rig. The simulating results show that synchronism of four motors´ rotational speed with synchronous regulator is much better than that without it. Under the two cases the rotational speed differences of the four motors are separately analyzed and compared in the dynamic and static rotational speed-regulating course. The theoretical analysis and simulating results manifest that synchronous regulator is an important part of the whole model, and the mathematical model with synchronous regulator is right and rational