Low-speed Maglev Train. In Suspended Electromagnet Of The Electromagnetic Characteristics

Suspension control technology is the core of the maglev system. To investigate the dynamci characteristic of the electromagnetic field of suspension electromagnet is the basic of the suspension controller design. Suspension electromagnet is the main executor of the suspension control system and supplies the attractive force needed by the suspension function. The characteristic of the electro-magnetic field has a direct influence on the performance of the suspension control system.This paper analyzes the electromagnetic field of suspension electromagnet of the low speed maglev train with Finite Element Analysis (FEA) method. Based on the electromagnetic modelling of the suspension magnet and guideway, the FEA software is used to research the electromagnet field in two dimension. The aim of the analysis is to study the relation of the electormagnetic force, current and the suspension gap. Consequently, the law of the force and the electromagnet coil current change, the law of the force and the gap between guideway and electromagnet are concluded. Synchronously, the characteristics of the horizontal offset and rolling electromagnetic field are studied during the train running. Next, The 3D electromagnetic field analysis is given to validate and reinforce the 2D analysis results, and the analysis results and experiment are compared. Finally, the magnet structure dimension is improved with the criterion of the electromagnetic force and electromagnetic field saturated state. The result may be regarded as a reference of the suspension electromagnet design.The main result of this paper is proved by the experiment and can be used to instruct the design of the suspension electro-magnet and controller.