[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.