A Single Locomotive Fixed Rolling Test Bench

Abstract

A stationary rolling test bench for a single locomotive, including 2 reaction frames and 1 upper axle, and a test unit group composed of the same number of test units as the wheel pairs of a single locomotive, wherein: the composition of the test unit is to support the wheels of the locomotive The shaft of the paired track wheel set is connected to the shaft of the wound asynchronous motor; and: the stator windings of each wound asynchronous motor in the test unit group are connected to the grid in parallel through the stator three-phase busbar; the rotor three-phase busbar is connected to the grid through the three-phase switch four-star Two phases of the rotor three-phase busbar are directly connected to the controllable rectifier through switch five, and the other phase of the rotor three-phase busbar is connected to the rotor winding connection point of two adjacent wound asynchronous motors Between, switch six is ​​connected in series, and the middle part of the axle of track wheel pair is equipped with flywheel. This kind of test bench has convenient synchronization, reliability, simple structure, low investment, small space occupation, easy installation and debugging, and convenient and simple test.

Description

technical field [0001] The invention relates to a stationary rolling test bench for railway diesel locomotives, electric locomotives, main line trains and subway trains. Background technique [0002] The function of railway electric or diesel locomotives is to pull trains, and the main working conditions are traction and braking. The main working conditions of main line trains and subway trains are also traction and braking: [0003] 1. Traction working condition: After the electric energy obtained by the electric locomotive from the power grid is converted into an appropriate voltage (including frequency) by the converter, it is converted into mechanical kinetic energy by the traction motor, and can output at different speeds that can be controlled by the driver. The traction force makes the train accelerate or run at a steady speed; the internal combustion engine first converts the chemical energy of the fuel into mechanical energy to drive the AC synchronous generator to ...

AI Technical Summary

Problems solved by technology

The locomotive is tested on the test bench, and its speed is only reflected by the locomotive wheel speed, and the car body does not move. Therefore, the equivalent moment of inertia reflected in the traction motor rotation dynamics equation is reduced to about 1 / 20 of the line operation. Influenced by the locomotive closed-loop control system designed according to the running conditions of the line, the speed may be unstable in the fixed rolling test

The dynamic instability of this kind of locomotive is the main obstacle to the realization of electrical synchronous adjustment accuracy. Many test bench scheme designs do not understand this, and there are no corresponding structural measures

[0016] 3) The stationary rolling test bench simulates the test process of two infinitely long straight rails through multiple independent track wheelsets. Many factors will cause the speed of each track wheel set to be different, making the locomotive mistaken for a certain track wheel set. Some wheel sets stop torque output due to idling, and then resume output to them, making the locomotive run unstable; especially when the locomotive starts, the output torque will stop frequently, making the locomotive unable to start normally

The existence of the shift gear box not only makes the equipment of the test bench complicated, the cost is high, but also makes the installation and adjustment complicated

[0019] 5) The complex synchronous mechanical connection parts, the gear shifting gearbox and the motor driving the track wheel can only be installed on the side of the track wheel set, so that the installation area requires a width of more than 6 meters

Therefore, the requirements for the test plant are high, the test operation is complicated, and due to the limitation of the site, it is difficult to build a fixed rolling test bench in the existing maintenance plant and section

[0020] In short, the existing test bench uses a DC motor to provide dynamic / resistance torque, and the electrical synchronization mainly relies on the DC motor to adjust the armature or excitation.

Images