This article proposes a novel hybrid-magnetic-circuit variable flux memory machine (HMC-VFMM) by combining series and parallel hybrid magnet structures. Thus, the synergies of wide flux regulation range in parallel type and excellent on-load demagnetization withstand capability in series type can be simultaneously obtained with the proposed HMC design. Meanwhile, two sets of the permanent magnets (PMs) with high coercive force and low coercive force (LCF), i.e., NdFeB and AlNiCo PMs, are employed to achieve high torque density and energy-efficient magnetization state adjustment. The topologies and tradeoffs of traditional parallel and series VFMMs are addressed first. In addition, the structure evolution, features and operating principle of the proposed HMC-VFMM are described, respectively. A simplified equivalent magnetic circuit is modeled to reveal the performance improvement of the machine. Then, the design improvements with q-axis barriers are presented to elevate the LCF PM working point for preventing the on-load demagnetizing effect, while maintaining the torque capability. The electromagnetic characteristics of the HMC design are investigated and compared with the parallel/series counterparts. Finally, the experiments have been carried out to validate the finite-element analyses.

中文翻译：

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一种新型混合磁路可变磁通记忆机


本文提出了一种结合串联和并联混合磁体结构的新型混合磁路可变磁通记忆机（HMC-VFMM）。因此，通过所提出的 HMC 设计，可以同时获得并联型宽磁通调节范围和串联型优异的负载退磁承受能力的协同效应。同时，采用两组高矫顽力和低矫顽力（LCF）永磁体（PM），即NdFeB和AlNiCo永磁体，实现高扭矩密度和节能的磁化状态调节。首先讨论传统并联和串联 VFMM 的拓扑和权衡。此外，还分别描述了所提出的HMC-VFMM的结构演变、特点和工作原理。对简化的等效磁路进行建模，以揭示机器性能的改进。然后，提出了 q 轴势垒的设计改进，以提高 LCF PM 工作点，以防止负载退磁效应，同时保持扭矩能力。研究了 HMC 设计的电磁特性，并与并联/串联设计进行比较。最后，进行了实验以验证有限元分析。