An Exploration of Voltage-Type Rotor Magnetic Field Indirect Vector Control

This study primarily delves into the control system of electric braking in urban rail trains, with a particular focus on the asynchronous motor and its associated mathematical model. The investigation embarks upon an exhaustive exploration of two discerning control methodologies: constant voltage-to-frequency ratio control and the rotor magnetic field-oriented vector control method with voltage feedforward decoupling. The culmination of this analysis, coupled with a profound comprehension of the fundamental principles of coordinate transformation, illuminates the intrinsically nonlinear, multivariable essence, and robust coupling characteristics inherent in the asynchronous motor. Through a comparative examination of the two control methods, the constraints of constant voltage-to-frequency ratio control come to the fore, instigating the proposition of a rotor field-oriented vector control strategy. The study reaches its apex with the development of a simulation model, facilitating a comprehensive juxtaposition of the aforementioned control methods. The simulation substantiates the superiority of the vector control method in the context of electric braking control.