【目的】永磁辅助同步磁阻电机(PMa-SynRM)因其优异的调速性能和成本优势在工业领域得到广泛应用，但转矩密度不足限制了其进一步发展。为提升电磁转矩，不对称转子PMa-SynRM成为研究热点。然而，现有研究尚未建立永磁转矩与磁阻转矩比例系数和电磁转矩提升能力之间的定量关系，且缺乏对磁极偏移角的系统分析，导致难以通过转矩分配关系和磁极偏移角度快速评估电机转矩性能。为此，本文系统研究转矩比例系数和磁极偏移角对电磁转矩的影响规律。【方法】基于上述规律，本文提出一种不对称转子PMa-SynRM，并采用有限元法计算其电磁性能。【结果】研究发现，随着转矩比例系数增大，电磁转矩提升幅度先增大后减小，在永磁转矩与磁阻转矩之比为2时，电磁转矩提升能力最强；随着偏移角度增大，电磁转矩提升能力逐渐增强。结果表明，所提电机电磁转矩提升7.82%，转矩脉动减小57.73%。【结论】本研究为不对称转子PMa-SynRM的转矩性能优化提供了重要理论依据。

[Objective] The permanent magnet-assisted synchronous reluctance motor (PMa-SynRM) has been widely adopted in industrial applications due to its excellent speed regulation performance and cost advantages. However, its further development is constrained by insufficient torque density. To enhance electromagnetic torque, the asymmetric rotor PMa-SynRM has become a research hotspot. Nevertheless, existing studies have failed to establish a quantitative relationship between the permanent magnet torque to reluctance torque proportion coefficient and electromagnetic torque enhancement capability, while also lacking systematic analysis of pole offset angle. Consequently, rapid evaluation of motor torque performance through torque proportion coefficient and pole offset angle remains challenging. To address this, this paper systematically investigates the impact of the torque proportion coefficient and pole shift angle on electromagnetic torque. [Methods] Based on these findings, this paper proposed an asymmetric rotor PMa-SynRM and evaluated its electromagnetic performance using the finite element method. [Results] The study revealed that as the torque proportion coefficient increases, the electromagnetic torque improvement initially rised and then declined, peaking when the ratio of permanent magnet torque to reluctance torque was 2. Furthermore, as the offset angle increases, the torque enhancement capability gradually strengthened. The results demonstrated that the proposed motor achieves a 7.82% increase in electromagnetic torque and a 57.73% reduction in torque ripple. [Conclusion] This study provides critical theoretical foundation for optimizing the torque performance of asymmetric rotor PMa-SynRMs.

黑龙江省自然科学基金(PL2024E006)