新型混合磁极型变磁通记忆电机及其高效控制技术研究

高效能高品质电机系统已成为我国向高端智能制造强国转型与发展的关键和核心。变磁通记忆电机利用电流脉冲改变永磁磁化水平，几乎无励磁损耗，被称作真正意义上的全域高效宽调速电机系统，有望解决传统永磁电机气隙磁场难以调控、高效恒功率区受限的“卡脖子”问题。本项目创新性地提出一类混合磁极型变磁通记忆电机，将不同结构形式的混合永磁磁极相结合，进行分离交错设计，打破原有记忆电机混合永磁存在的“空间”制约，兼具反凸极记忆电机“宽调磁强稳磁”和内置式永磁电机“高转矩密度”的优势。重点研究：1）新型拓扑及设计规律；2）混合磁极协同工作及调磁机理；3）基于混合解析模型的电磁性能快速计算与全局协同优化设计理论；4）基于全转速范围磁链观测和磁化状态在线选择的最大转矩电流比控制技术。该项目的开展不仅能丰富和发展变磁通电机理论与技术体系，而且面向国家对于宽调速领域用高效能电机系统的重大需求，具有重要科学意义和工程价值。

High-efficiency and high-quality electrical machine system has become a key and core role in China’s transformation and development progress into a powerful country in terms of cutting-edge intelligent manufacturing. Variable flux memory machine (VFMM) is widely recognized as a truly overall-driving-cycle high-efficiency and wide-speed-range machine system, which utilizes a current pulse to change the magnetization level of low coercive force (LCF) magnet with negligible excitation loss. Thus, VFMM can well address the critical issues of conventional permanent magnet (PM) machine in terms of non-adjustable air-gap flux, and limited high-efficiency constant power speed range. This project innovatively proposes a series of novel hybrid-magnet-pole VFMMs (HMP-VFMMs), which combine different types of hybrid PM poles characterized by a separately alternate design. As a consequence, the proposed design can break the spatial restriction between hybrid magnets in the existing VFMMs, combining the distinct advantages of “wide flux controllability and excellent demagnetization withstand capability of LCF PMs” in reverse saliency VFMM, as well as “high torque density” in interior PM machines. The key objectives of this project are: 1) novel machine topologies and design rules; 2) collaborative work principle and variable flux mechanism of hybrid PM poles; 3) rapid computational technique of the electromagnetic performance and global coordinative design optimization theory based on a hybrid analytical model; 4) a maximum-torque-per-ampere control scheme based on full-speed-range flux linkage estimation and online magnetization state selection. The establishment of this project can not only enrich and develop the theoretical and technological system of VFMM, but also cater to national strategic desire for high-efficiency and high-quality electrical machine system for wide-speed-range applications. Therefore, this project is of great scientific significance, as well as engineering application value.