Hybrid Low Power Consumption Of The Ems System Suspension Control Technology

In order to reduce the energy consumption of maglev train's suspension system, this paper carefully researches the suspension control technology of micro-energy consumption in hybrid EMS system, which is based on the analysis of domestic and foreign new-style maglev trains.Firstly, five kinds of new-style maglev trains in America and two kinds of new permanent suspension technologies in China are investigated, involving GA, Magplane, Maglev2000, M3, AMT, MAS and Compensating Suspension. Permanent magnet is used in most of these technologies to reduce energy consumption. Secondly, the zero-power suspension control technique in hybrid EMS system is discussed. A sliding mode controller is designed based on the zero-power model using current feedback control. Simultaneously, a control model using flux feedback merely is given. The stable range of control parameters is calculated and the performance of the controller is simulated. The analysis result indicates that permanent magnet accordingly makes the suspension system more difficult to control. Thirdly, it is validated that the NdFeB can actually decrease the energy consumption of suspension. The restriction on the design of the hybrid magnet is analyzed, which is caused by the characteristic of the NdFeB. A one DOF suspension device with a hybrid magnet is achieved to validate the control strategy. The structure of the device and the design process of the hybrid magnet are introduced detailedly. Lastly, the control experiment is carried out on the designed device. The structure, function and principle of the suspension control system are described. The performance of the hybrid magnet is tested. It is found by the experiment that the hybrid suspension system has the advantages of micro-energy consumption and satisfying dynamic performance. The shortcoming occurred in the experiment is also analyzed.The results of theoretic analysis and control experiment show that by using of the NdFeB permanent, the energy consumption in hybrid EMS system can be eliminated, and the suspension gap can be larger than before. The results of this paper have a great signification to decrease the cost of maglev train.