A New Design Concept for Permanent Magnet Vernier Machine: Positive-Mutual-Coupling for Improved Power Factor and Higher Field-Weakening Capability

• DOI: 10.36227/techrxiv.171863608.83766474/v1
• Publication Date: 2024-06-17T14:54:51Z
• Authors: Shuangchun Xie; Christopher H.T. Lee
• Keywords: Engineering; Field weakening; Inductance; 620

This article investigates a permanent magnet vernier machine (PMVM) equipped with positive-mutual-coupling (PMC) winding. The conventional winding layout typically presents negative-mutual-coupling (NMC) among the three-phase windings due to 120 spatial phase shift. It is illustrated that in NMC winding, q-axis self- and mutual flux linkages are superimposed on each other. In contrast, proposed PMC exhibits counteracted linkages, which contributes reducing terminal voltage. generic methodology design presented exemplified 24-slot, 5-armature pole pair, 19- rotor pair PMVM. Finite element analysis shows PMVM could improve rated power factor widen constant torque region. With reduced voltage more margins, can employ higher current generate torque, thus significantly enhancing output during field-weakening operations. As result, capability speed range (CPSR) improved dramatically. Finally, prototype manufactured validate efficacy of improving factor.