The axial flux permanent magnet (AFPM) machines with the parallel magnetic circuit (PMC) rotor can effectively improve its torque density. The PMC rotor consists of two sub‐rotors, radial Halbach array permanent magnet (PM) and tangential PM. The magnetic fields generated by two sub‐rotors are not in the same 2‐D analytical planes. In this paper, an equivalent analytical model of PMC‐AFPM machines is proposed to solve this problem. The radial Halbach array PM rotor is equated to the axial Halbach array PM rotor based on the equivalent transformation principle. The exact subdomain models of equivalent axial Halbach array PM rotor and tangential PM rotor are built respectively and then superimposed to obtain the magnetic field distribution. The electromagnetic characteristics of the PMC‐AFPM machine under no‐load and load conditions are calculated by the proposed analytical model and compared with calculations of the finite element model (FEM). The results verify the accuracy of the equivalent analytical model. The comparative analysis of the AFPM machines with PMC rotor and tangential PM rotor verifies the advantage of PMC rotor configuration to improve the torque density. © 2024 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

中文翻译：

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并联磁路轴向磁通永磁电机磁场等效解析模型

带有并联磁路（PMC）转子的轴向磁通永磁（AFPM）电机可以有效提高其扭矩密度。PMC转子由两个子转子组成，径向Halbach阵列永磁体（PM）和切向PM。两个子转子产生的磁场不在同一二维解析平面上。本文提出了PMC-AFPM机器的等效分析模型来解决这个问题。根据等效变换原理，将径向Halbach阵列永磁转子等效为轴向Halbach阵列永磁转子。分别建立等效轴向Halbach阵列永磁转子和切向永磁转子的精确子域模型，然后叠加以获得磁场分布。通过所提出的分析模型计算了 PMC-AFPM 电机在空载和负载条件下的电磁特性，并与有限元模型（FEM）的计算进行了比较。结果验证了等效分析模型的准确性。通过对带有PMC转子和切向永磁转子的AFPM电机的对比分析，验证了PMC转子配置在提高扭矩密度方面的优势。© 2024 日本电气工程师协会和 Wiley periodicals LLC。