用于城市交通的直线电机推进系统

Linear Motor Propulsion for Urban Transit

现代城市交通系统必须提供连发列车间隔时间短的高水平服务。线路的设计必须灵活并且允许存在局部陡峭路际,从而最大程度地降低交通系统成本。不管气候如何,交通系统都务必要保证列车准点到站。直线感应电机(LIM)推进系统在理论上能满足运行要求,而且其加速度和制动力都不依赖于轮轨粘着,其拓扑结构是短一次侧在车上而长二次侧在地面。为了设计可行的交通系统,必须要考虑LIM拓扑的影响。设计时需考虑气隙问题、反应轨结构改变问题、法向力及直接驱动的操作问题。LIM推进系统已经开发出两代,并在5个先进的交通系统中成功应用。

Modern urban transit systems must provide a high level of service with short headways. The design of the route alignment must be flexible and permit steep grades to reduce system cost. Reliable precision stopping at stations under all weather conditions is essential. Linear Induction Motor （LIM） propulsion ideally meets the operating requirements, providing adhesion-independent transmission of acceleration and brake forces. The topology used is a short vehicle mounted primary and a long track mounted secondary. The effects of the LIM topology must be considered in order to design a viable transit system. Issues are the air gap, changes in reaction rail configuration, the vertical forces and the operation as a direct drive. Two generations of LIM propulsion have been developed and are described in this paper. LIM propulsion has been successfully deployed in five advanced transit systems.