Research On Controlling Electric Magnetic Levitation Device On Rotating Magnetic Field

ABSTRACT:Maglev train is a kind of new-style ground vehicles, no contact with high pollution, noise, low energy consumption, easy maintenance, high safety. Currently the maglev trains have two kinds of type, but the suspension control complex. Type of control simpler, but usually only in vehicle movement when suspension. In recent years, in order to realize the static electric magnetic levitation vehicles, put forward two kinds of schemes, foreign exchange is permanent magnet coil type wheel and magnetic levitation. Among them, permanent magnet wheeled needs high-speed mechanical rotation; Exchange coil type needs high-frequency currents. Our vast territory, a big population and since the reform and opening up, along with the continuous economic development and the acceleration of urbanization, the development of technology is long-term maglev transportation plan and has important strategic significance.Rotating magnetic levitation device type is through on-board axial magnetic induction motor stator and overall type on the ground of aluminum induction plate interaction to work. This suspension are unique; the more Simple structure, convenient maintenance, No machinery, more energy, No noise high-speed rotary machinery.This paper studies the characteristics of induction motor model and analysis on the induction motor rotation and physical structure of induction motor and former differences related research achievements, and on the basis of analysis of the common reference motor, this paper presents a new model of electromagnetic field, and at the same time, a one-dimension model analysis methods of the equivalent circuit model T. The effect of transverse edge by introducing the air-gap equivalent length calculation process, saves the equivalent circuit of the lateral side effect coefficient. In order to understand the linear induction motor sports disc in the process of electromagnetic field distribution, using Ansoft software of electromagnetic induction motor for 3d finite element analysis, and analyses the air-gap magnetic field distribution curve.In the research on the control strategy of considering effect of indirect field-oriented vector control methods studied and analyzed, and the application of SIMULINK tool for the fixed vector control scheme is simulated.In the hardware, discusses the overall structure of the system, power main circuit and control circuit of two parts. The main circuit power rectifier circuit, by the filter circuits and IPM power conversion module. Control circuit design based on DSP controller, the main development board signal acquisition circuit (main circuit current), the hardware system structure compact, reliable. Which gives some important component selection and calculation of the parameters. In the design of software system, the first identified SPWM modulation method, and then gives DSP control system of main program and important interrupt subroutines program flowchart.Finally, based on this topic design of a prototype and driving control system, the motor running experiment, and achieved good control signal data waveform, the good performance of motor speed motor speed and torque control.