Recently, the subway permanent magnet direct drive motor traction system developed and produced by CRRC Times Electric successfully completed the loading inspection, which indicates that the company has become the only traction equipment supplier in China to master this core technology and continue to lead the domestic rail transit traction technology. Direction of development.
The permanent magnet direct drive motor traction system eliminates the reduction gear box in the traditional traction system, which can effectively improve the system transmission efficiency, reduce the noise and maintenance, and on the other hand shorten the wheelbase of the bogie and effectively improve the curve passing ability of the train. . Based on its unique technical advantages, the permanent magnet direct drive motor traction system has become a hotspot for the research of various rail transit powers. Because of its high technical threshold, it also represents the highest technical level of rail vehicle traction system suppliers.
In 2014, CSR Times Electric carried out research work on the traction system of the permanent magnet direct-drive motor of the subway relying on the research project of the “City Rail Transit Direct Drive Permanent Magnet Synchronous Traction System”. Based on the deep accumulation of the company's permanent magnet synchronous traction system technology for many years, after two years of research, it has overcome the parameters optimization matching strategy of direct drive traction system, the position sensorless control algorithm of permanent magnet motor, and the electromagnetic design of low speed and high torque permanent magnet motor. The core technology of thermal management design method and key manufacturing process of the axle-type motor successfully developed the traction system of the permanent magnet direct-drive motor of the subway. Through the verification of the ground test, the efficiency of the permanent magnet direct drive motor is as high as 94%, and the motor noise is only 87dB, which is 15dB lower than that of the gearbox drive traction motor.
In March of this year, the subway permanent magnet direct drive motor traction system developed by CRRC Times Electric successfully completed the train loading test, and completed the train dynamic performance test, the adhesion utilization control test and the direct drive bogie dynamic test. The performance indicators are satisfied. Application requirements for subway trains. The test results show that the energy consumption of the permanent magnet direct drive motor traction system is reduced by more than 15%, which can reduce the vehicle noise by 3dB.