Maglev Train Suspension Controller Design Study Of The Electronic Load

In the development of Maglev Vehicle, design and testing of the levitation controller is highly important, which is incessantly required to be repeated and improved. If the parameters of the levitation controller are not appropriate in a suspension experiment, the system is not convergent, which brings about mechanism vibration, a excessively great electric current and leads the controlled objects to be damnified. But the suspension experiment must be incessantly repeated and be plentifully investigated to acquire the suitabler controller. In order to make design and testing of the levitation controller convenient and reduce the damnification, a simulated experiment environment is required to be constructed. In the simulated environment, the levitation controller controls a dummy object, while testing and adjusting is executed. The intention of this paper is to design an electronic load to replace the actual controlled objects, with which it is conceivable to test performance and adjust parameter of the controller by performing the suspension experiment in half material object emulation.This article mainly deals with the design of the electronic load. First, the structure of suspension control system and the control principle of levitation controller are studied. Performance indices and testing methods of the levitation controller are investigated. Design requirements of the levitation controller's electronic load are put forward. Various schemes of the electronic load are analyzed and comparatived.The final scheme of the electronic load based on personal computer is provided. After that, the model of suspension controlled objects is studied. Modeling is a key question of the electronic load so as to determine directly whether the electronic load could replace the actual load accurately. The accurate model with neural networks is set up base on studying of theory modeling and routine distinguish modeling. Finally, hardware and software of the electronic load is designed. As dummy load of the levitation controller the electronic load acts the control outputs (voltage) on electromechanical model of the load. Then the state outputs such as electric current clearance and acceleration which will be acted as the next control outputs in next turns are transmitted to the levitation controller. The process is repeated so as to gain the test results on the levitation controller through the dummy load. The electromechanical model of the electronic load is carried out on the PC and the datacollection is realized through CPLD in this paper. The data between dummy load and levitation controller is transmitted through the enhanced parallel port. The paper finds a solution to the real-time data communications based on parallel port with high speed and brings to bear design and prime experiments of the electronic load.