Collaborative Research: Direct-Drive Modular Transverse Flux Electric Machine without Using Rare-Earth Permanent Magnet Material

摘要本研究的目的是开发紧凑、高扭矩密度、节能、无稀土材料的电机，用于替代能源和运输应用。方法是使用横向磁通路径的概念与非常规的“环”绕组，允许增加极数而不减少每极的安培匝数。本研究的目标将通过电磁、结构和热设计、分析和优化，然后制造和测试一个50kW的原型电驱动来实现。知识优势：所提出的横向磁通机具有模块化结构，使用磁通聚焦技术来增加气隙磁通密度，而无需使用高磁通密度的材料。杆的模块化允许易于组装和机器的可扩展性。每个模块或相位的双绕组为开发创新的控制方法打开了大门。该结构具有高定子铁芯利用率和高容错能力，这是牵引机和风力发电机非常需要的特性。更广泛的影响：该研究将建立高扭矩和功率密度电机的设计和设计方法，而不使用昂贵的稀土磁铁材料。即将设计的实用且成本较低的机器将促进替代运输，并提高可再生能源收集技术的普及率。该研究将建立美国在紧凑型，高扭矩电机领域的立足点，促进无齿轮机电系统。以替代能源和交通运输的讲座和实验模块为基础的综合教育计划将有助于培养许多研究生和本科生。

Earth Permanent Magnet MaterialAbstractThe objective of this research is to develop compact, high torque density, energy-efficient, rare-earth-material-free electric machines for alternative energy and transportation applications. The approach is to use the concept of transverse flux paths with the unconventional "ring" winding that allows the increase of pole numbers without the reduction of ampere-turn per pole. The goals of this research will be achieved through electromagnetic, structural and thermal design, analysis and optimization followed by fabrication and testing of a 50kW prototype electric drive. Intellectual Merit: The proposed transverse flux machine has a modular structure that uses the flux focusing technique to increase air-gap flux density without having to use high flux density materials. The modularity of poles allows for easy assembly and scalability of the machine. The double windings per module or phase open the door for developing innovative control methodologies. The structure has high stator core utilization, and high fault tolerance capability, which are highly desirable features in traction machines and wind generators. Broader Impacts: The research will establish designs and design methodologies for high torque and power density electric machines without using expensive rare-earth magnet materials. The practical and lower cost machines to be designed will promote alternative transportation and increase the penetration rate of renewable energy harvesting technologies. The research will establish the US foothold in the area of compact, high-torque motors facilitating gearless electromechanical systems. The comprehensive educational plan built with lecture and laboratory modules on alternative energy and transportation will help train many graduate and undergraduate students.