Improving Efficiency of a Pole-Changing Vernier Machine Considering Residual Magnetic Flux Density

This paper presents the efficiency improvement of a pole-changing vernier machine (PCVM) by considering residual magnetic flux density (Br) low coercivity force (LCF) permanent magnets (PMs). The PCVM operates in two modes: (VM) mode and magnet synchronous (PMSM) mode, achieved through pole-changing. Pole-changing involves reversing direction LCF PM to alter number rotor pole pairs. By changing pairs, as VM at speeds, providing high torque, PMSM offering efficiency. To achieve this, combination (HCF) is utilized single structure. determined Br, highest when Br reaches its maximum value |Brm|. focuses on improving obtaining Brm −Brm design process. Additionally, finite element analysis (FEA) employed compare performance improved model, which considers with that conventional designed without Br. model achieves higher values each compared resulting increased torque density. Consequently, this leads