Torque Ripple Test and Analysis for Traction Drive System of EMU
AC drive technology has been widely used in the traction drive system of high-speed railway EMUs.The DC-link voltage of the traction converter contains a ripple component with its frequency double of the traction network voltage,leading to beat frequency currents on the traction motor side by which the torque ripple caused.This is hazard to the stable operation of EMU electro-mechanical system.Firstly,generation mechanism of the torque ripple is analyzed.Then,according to the traction converter main circuits,two typical EMU traction drive systems are modeled so as to analyze the dominate influencing factors of torque ripple through digital simulation.Further,field test is carried out,which not only verifies the correctness of the theoretical analysis,but also acquires the relation between the torque ripple and the generated mechanical stress.It is noted that torque ripple is easy to cause mechanical loss to adjacent mechanical components such as traction motor and bogie.Finally,the torque ripple suppression technology is discussed from both hardware circuit and software control aspects.
High-speed EMUtraction drive systembeat frequency currenttorque ripplemechanical stress
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NSTL
万方数据
维普
