Power Density Optimisation of a Linear Electrical Drive

直线电机提供了一种紧凑且机械效率高的方式来连接电力和直线运动。直线电气传动由电机、功率转换器、运动控制算法、潮流控制器和机械集成组成。在电力推进中，线性电力驱动在自由活塞发动机、航空航天驱动、磁悬浮和电动转向等方面都有应用。除了推进，直线传动还常用于工业过程驱动和可再生能源应用中。尽管电磁传动与旋转传动相同，但直线传动的往复性质对电机和功率转换器提出了独特的挑战，导致电力脉动和磁力不平衡。高力密度、高效率、低成本、健壮性和容错性都是理想的品质，而最合适的设计往往是在对整体系统成本的影响方面在这两者之间进行折衷。通过集成主动质量、支撑结构和电力电子元件的模型，将针对典型的推进规范开发可扩展的线性电驱动。

Linear electrical machines provide a compact and mechanically efficient way of interfacing electrical power and linear motion. A linear electrical drive consists of an electrical machine, a power converter, a motion control algorithm, a power flow controller and mechanical integration. Within electric propulsion, linear electrical drives have applications in free piston engines, aerospace actuation, mag-lev and electric steering. Outside of propulsion, they are commonly found in industrial process actuation and considered in renewable energy applications.Although the electromagnetics are common with their rotatory counterpart, the reciprocating nature of linear drives poses unique challenges to the electrical machine and power converter, resulting in pulsating electrical power and unbalanced magnetic forces. High force density, high efficiency, low cost, robust and fault tolerance are all desirable qualities, and the most appropriate design is often a compromise between these in terms of impact on overall system cost.In this project overall power density (kW/kg) of linear electrical drives will be investigated. By integrating models of active mass, support structures and power electronic components, a scalable linear electric drive will be developed against a typical propulsion specification.