Design and Analysis of Asymmetric Consequent-Pole Permanent Magnet Assisted Synchronous Reluctance Motor Based on Flux Linkage Phase Shifting Principle
Zhou Huawei, Long Shunhai, Jiang Guangyao, Wang Chengming, Liu Zhengmeng
School of Electrical and Information Engineering Jiangsu University Zhenjiang 212013 China
Abstract In recent years, with the rising price of permanent magnet materials, magnet motors with high efficiency, high torque density, and fewer permanent magnets have gained much attention. The electric propulsion system for high torque density, low torque ripple, and low-cost permanent magnet motor is required. This paper proposes a new asymmetric consequent-pole permanent magnet-assisted synchronous reluctance motor (ACP- PMaSynRM), which can enhance output torque, reduce torque ripple, and decrease permanent magnet amounts. An ACP-PMaSynRM with 48 slots and 14 poles was designed based on the phase-shifting principle of permanent magnet flux linkage. Double three-phase double-layered distributed windings are adopted, and the flux barriers of the second and third layers are asymmetrical in the rotor. Additionally, the asymmetrical consequent-pole permanent magnets are embedded in the flux barriers of the second and third layers. The asymmetric rotor structure comprises the consequent-pole permanent magnets and the asymmetric flux barriers. The right flux barriers of the second and third layers are shifted by a phase angle λ to the left. Therefore, the maximum value of permanent magnet flux-linkage is shifted by an angle γ from the traditional d-axis to the new d1-axis, thus forming a new d1-q1 coordinate system. Therefore, it can be deduced that the output torque of ACP-PMaSynRM in the d1-q1 coordinate system is ${{T}_{e}}=\frac{3}{2}p{{\psi }_{pm}}{{i}_{s}}\cos {{\beta }_{2}}+\frac{3}{4}pi_{s}^{2}\left( {{L}_{q}}-{{L}_{d}} \right)\sin 2\left( \gamma +{{\beta }_{2}} \right)={{T}_{pm}}+{{T}_{r}}$ It can be noticed that Tpm and Tr simultaneously reach the maximum value when γ =π/4 and β2=0. Using the finite element method (FEM), the structural parameters of permanent magnets were optimized to fully utilize the permanent magnet and reluctance torque. Compared with traditional PMaSynRM, the amount of permanent magnet of ACP-PMaSynRM is reduced by 9.9%. The fundamental component of back-EMF of ACP-PMaSynRM is almost the same as that of traditional PMaSynRM. Meanwhile, the utilization of permanent magnet and reluctance torque of ACP-PMaSynRM is increased by 20.5% and 4.2%, respectively. The current phase angles corresponding to the maximum permanent magnet torque and the maximum reluctance torque are the same, thus realizing the full utilization of the permanent magnet and reluctance torque. Therefore, compared with the traditional PMaSynRM, the average torque of ACP-PMaSynRM is increased by 10.5%, and the torque ripple is reduced by 50%. Finally, a prototype with 48 slots and 14 poles was fabricated to verify its feasibility. The measured results are almost consistent with the simulation. The following conclusions can be drawn: (1) ACP-PMaSynRM can improve the utilization rate of the permanent magnet, realize the full utilization of permanent magnet and reluctance torque, and enhance output torque capability. (2) Compared with traditional PMaSynRM, ACP-PMaSynRM uses an asymmetric consequent- pole permanent magnet array, which can improve the air-gap magnetic density, back-EMF, and output torque capacity while reducing torque ripple. (3) The third harmonic back-EMF is high, and further research is needed to suppress the harmonic.
Zhou Huawei,Long Shunhai,Jiang Guangyao等. Design and Analysis of Asymmetric Consequent-Pole Permanent Magnet Assisted Synchronous Reluctance Motor Based on Flux Linkage Phase Shifting Principle[J]. Transactions of China Electrotechnical Society, 2024, 39(2): 455-464.
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2024, Vol. 39 
