少稀土类多励磁源双定子磁通切换电机系统基础研究

With the sustainable macro-control of such strategic resources as rare-earth, the unstable supplies and increasing price have become one of negative factors to the rapid development of the rare-earth permanent magnet motors and as well as electric vehicles (EVs). So a new type of less-rare-earth permanent magnet (LREPM) motor has become one of hot issues in the new energy vehicles. In this project, by incorporating the theories of partitioned stator flu-switching permanent-magnet machines, online flux-controllable motor and co-excitation of multi-type of permanent magnets into the less-rare-earth permanent magnet motor, a new less-rare-earth multi-excitation double-stator flux-switching motor is proposed for EVs, which has merits of high power density, high efficiency, wide sped rand and low cost. The reasonable structure and basic operation principle of the new motor will be investigated in details. Furthermore, the multi-objective optimization design method will be explored; the relationship between the amount of different permanent magnet material, the power density and speed range of the motor will be researched; multi-mode driving strategies based on online flux control will be investigated under different operation conditions. This project will lay a theoretical foundation and technical support for the application of LREPM motor in EVs.

随着我国持续对稀土永磁等战略资源实现宏观调控，供应源不稳定、价格持续攀升等成为制约稀土永磁电机以及电动汽车快速发展的不利因素。少稀土类永磁电机已成为目前新能源汽车驱动电机领域的研究热点和前沿之一。本项目将新型“定子分区式”磁通切换电机运行机理、“在线调磁”电机理论与“多励磁源励磁”理论相融合，提出一类适合电动汽车运行特点、具有“高功率密度、高效率、宽调速范围和低成本”的新型少稀土类多励磁源双定子磁通切换电机。本项目旨在探索该类多励磁源共同励磁的少稀土类永磁电机的合理结构、工作原理和基本设计原则；研究基于多目标优化设计理论的电机一般设计方法；归纳出多励磁源类电机中不同永磁材料的用量、电机的功率密度、调速范围等之间的内在联系和一般规律；提出符合电动汽车运行规律和特点的基于在线调磁的多模式分区驱动控制策略。本项目的研究，将为少稀土永磁电机及系统在电动汽车中的应用研究提供一定的理论基础和技术支持。

本项目将新型“定子分区式”磁通切换电机运行机理、“在线调磁”电机理论与“多励磁源励磁”理论相融合，针对电动汽车潜在应用背景的运行特点，提出了具有“高功率密度、高效率、宽调速范围和低成本”的少稀土类多励磁源双定子磁通切换电机，其中包括：定子分区混合励磁磁通切换电机；少稀土类混合永磁定子分区磁通切换电机；少稀土类定子分区式双侧混合励磁型磁通切换电机，并制造加工相关样机2台。在探索该类多励磁源共同励磁的少稀土类永磁电机的合理结构、工作原理的基础上，建立了组合励磁型少稀土类定子分区式磁通切换电机有限元建模、电磁参数计算、温度分析、机械强度校核、系统建模和仿真的一般方法；提出了兼顾电机“功率密度、效率、调速范围、成本”等多个性能指标的多目标优化设计方法；针对电动汽车等领域不同运行工况下对电机效率、转矩以及调速范围的要求，提出了基于在线调磁的多模式分区驱动控制策略。.项目执行期间，共发表相关学术论文7篇，其中SCI论文4篇，EI论文3篇，申请国家发明专利4项，其中授权2项。项目的顺利实施和完成，也为项目负责人和团队成员继续从事电动汽车领域新型永磁电机的科学研究，奠定了基础。