多运行工况下广域高效可控漏磁类永磁电机系统研究

Permanent magnet motors have attracted considerable attention due to inherent merits of high torque/power density and high efficiency. However, the motor air-gap density is almost kept constant and thus the speed range is relatively narrow. And such adverse factors limit the further large-scale application in electric vehicles, where wide-area high efficiency is needed. In this project, by integrating the new design concept of flux-leakage-controllable into the theory of wide-speed-range motors, a new kind of flux leakage controllable permanent magnet motors is proposed. In such motors, the d-q-axis magnetic path of stator armature windings are purposely coupled with the flux leakage path of PMs, thus not only the motor speed range is effectively widened, but also the wide-area high efficiency of motors under multiple operation modes can be realized. The purposes of this project are to explore the basic structure characteristics and operating principle of this new motor, to investigate the comprehensive design theory and approaches of the wide-area high efficiency motors based on multi-objective optimization method, and to propose the multi-mode drive control strategy and high efficiency operation theory of this kind of motors under complicated operation conditions. Consequently, the research of this project will improve and enrich the design theory of multi-mode wide-area high efficiency motors. Furthermore, it will contribute to the application of controllable-flux-leakage motors in electric vehicles and promote the sustainable development of electrical vehicles.

永磁电机具有高效率、高功率密度等优点，但电机气隙磁场基本保持恒定，调速范围窄，在电动汽车等需要宽调速、广域高效场合的应用受到一定限制。本项目将提出的“可控漏磁”设计方法与“宽调速电机”相融合，形成了一类新型可控漏磁宽调速永磁电机。该电机通过将定子电枢绕组d、q轴磁路与永磁体漏磁磁路相互耦合，基于不同运行工况下电枢电流的变化，调节和控制漏磁通与有效主磁通，力图实现电机多运行工况下的广域高效。本项目旨在探索该类具有新型漏磁、聚磁结构的电机工作原理和基本特征；研究基于“多目标优化”的广域高效多工况电机综合设计方法；提出复杂运行工况下该类电机多模式驱动控制策略。本项目的研究，将为丰富和完善车用驱动电机多工况广域高效电机设计理论提供理论基础；同时也将为可控漏磁类永磁电机在电动汽车中的推广应用、促进电动汽车的长期稳定发展，提供有益帮助。

永磁电机具有高效率、高功率密度等优点，但电机气隙磁场基本保持恒定，调速范围窄，在电动汽车等需要宽调速、广域高效场合的应用受到一定限制。本项目所提出的“可控漏磁”设计方法与“宽调速电机”相融合，形成了一类新型可控漏磁宽调速永磁电机。该电机通过将定子电枢绕组d、q轴磁路与永磁体漏磁磁路相互耦合，基于不同运行工况下电枢电流的变化，调节和控制漏磁通与有效主磁通，实现电机多运行工况下的广域高效。本项目研究了该类具有新型漏磁、聚磁结构的电机工作原理和基本特征；研究基于“多目标优化”的广域高效多工况电机综合设计方法；提出复杂运行工况下该类电机多模式驱动控制策略。本项目的顺利开展为丰富和完善车用驱动电机多工况广域高效电机设计理论提供理论基础；同时也将为可控漏磁类永磁电机在电动汽车中的推广应用、促进电动汽车的长期稳定发展，提供有益帮助。