Power Density Optimisation of a Linear Electrical Drive

线性电机提供了一种连接电力和线性运动的紧凑且机械有效的方式。线性电驱动由电机、功率转换器、运动控制算法、功率流控制器和机械集成组成。在电力推进中，线性电驱动器应用于自由活塞发动机、航空航天驱动、磁悬浮和电动转向。除了推进之外，它们还常用于工业过程驱动，并被用于可再生能源应用。虽然电磁驱动与旋转驱动相同，但直线驱动的往复运动特性对电机和功率转换器提出了独特的挑战，导致脉动电力和不平衡的磁力。高力密度、高效率、低成本、鲁棒性和容错性都是理想的品质，最合适的设计往往是在这些对整体系统成本的影响方面进行折衷。在本项目中，将研究线性电驱动器的整体功率密度（kW/kg）。通过集成有效质量、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力驱动。

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.