Maximum Torque Control of Induction Traction Motor Based on DQ Axis Voltage Regulation

In the high power traction driving system, induction motor is widely used with its advantages of strong structure, high reliability and low cost. When the voltage source inverter is used as the driving device of the induction motor and the motor speed exceeds the rated speed, it is required to consider the limit of DC bus voltage and inverter rated current. Therefore, an appropriate field weakening control strategy is needed to reduce the rotor flux, and to enhance the output torque of the motor when induction motor operation in the filed weakening region. According to the above problems, considering the DC side bus voltage limit and the inverter current limit, this paper focuses on the analysis the current distribution of induction motor in the field weakening region to achieve maximum torque output, and proposes a method which achieve the maximum torque output in full speed range based on the DQ axis voltage regulation. In the final, the simulation results are verified on the MATLAB/Simulink simulation platform.