Novel Ultra-high Polarity and High-frequency Axial Flux Electric Machines and Wide Band Gap Power Electronic Drives

电动机占电力消耗的60%以上，电机和相关的电力电子驱动器代表了数十亿美元的产业。该研究将通过转型设计，多物理场分析和电力电子（包括宽带隙器件）的最新发展的协同组合，为高效率和高性能电机和驱动器开发基础知识和创新概念。该项目将培训研究生和本科生，促进工程教学和培训课程的开发，以宣传方式传播成果，支持STEM初中和高中的外联活动，并加大努力吸引包括妇女和少数民族在内的学生接受科学和工程高等教育。提高电机的基本工作频率原则上会提高功率密度，前提是可以克服传统设计特有的较高损失、较低材料利用率和更复杂结构等典型挑战。该研究将在这方面提供创新的解决方案，并研究两种新型的轴向磁通永磁电机拓扑结构，这些拓扑结构最适合超高极数和高基频操作，通过具有宽带隙器件的电力电子控制供电来确保。一种适用于高速操作的构造采用了具有多层中的创新连续波相绕组布置的无芯定子。适用于低速直接驱动操作的另一种构造采用特殊的转子和具有绕组图案的创新的铁磁芯定子，使得定子线圈和齿比转子磁极的数量低一个数量级，这是远远超过已知拓扑结构的特性的设计特征。该机器还具有扭矩放大效果，在给定功率输出的情况下，有助于减小尺寸和提高效率。对于两相机设计，创新的混合H桥逆变器，包括一个腿与宽带隙器件和硅器件的另一个腿提出了控制和系统集成。计算研究包括电磁，热和机械应力的多物理分析，数学优化的差分进化算法，以及数千个候选设计的系统比较。实验研究包括建立原型演示和实验室测试。其成果是超高功率密度和高效的电机驱动系统。该奖项反映了NSF的法定使命，并且通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

Electric motors account for more than 60% of the electricity consumed and electric machines and associated power electronic drives represent a multi-billion dollar industry. The research will develop fundamental knowledge and innovative concepts for high-efficiency and high-performance electric machines and drives through a synergetic combination of transformational designs, multiphysics analysis, and the latest developments in power electronics, including wide band gap devices. The project will train graduate and undergraduate research students, lead to engineering teaching and training curriculum development, publically disseminate the results, and support STEM middle and high school outreach activities and increased efforts to attract students, including women and minorities, to higher education in science and engineering.Raising the fundamental operating frequency for electrical machines results, in principle, in increased power density, provided that the typical challenges of higher losses, lower material utilization, and more complicated constructions, which are specific to conventional designs, can be overcome. The research will provide innovative solutions in this respect and study two novel axial flux permanent magnet machine topologies, which are best fitted for ultra-high number of poles and operation with high fundamental frequency, ensured through controlled supply from power electronics with wide band gap devices. One construction, suitable for high-speed operation, employs a coreless stator with an innovative continuous-wave phase winding arrangement in multiple layers. Another construction, suitable for low-speed direct drive operation, employs special rotors and innovative ferromagnetic-core stators with a winding pattern such that the stator coils and teeth are one order of magnitude lower than the number of rotor poles, a design feature that far exceeds the characteristics of known topologies. This machine also incorporates a torque magnification effect, which contributes to size reduction and efficiency increase for given power output. For two-phase machine designs, innovative hybrid H-bridge inverters comprising one leg with wide band gap devices and another leg with silicon devices are proposed for control and system integration. Computational studies include multi-physics analysis for electromagnetic, thermal, and mechanical stress, and differential evolutionary algorithms for mathematical optimization, and systematic comparison of thousands of candidate designs. Experimental studies include building prototype demonstrators and laboratory testing. The outcomes are ultra-high power density and efficient electric machine - drive systems.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.