基于磁链相移原理的不对称交替极永磁辅助同步磁阻电机设计与分析

doi:10.19595/j.cnki.1000-6753.tces.221805

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Abstract

In recent years, with the rising price of permanent-magnet material, permanent magnet motors with high efficiency, high torque density and fewer permanent-magnets have gain much attention. To meet the demand of electric propulsion systems for high torque density, low torque ripple, and low-cost permanent magnet motor, 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 amount of permanent magnet.
An ACP-PMaSynRM with 48 slots 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 is composed of 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

It can be noticed that T_pm and T_r simultaneously reach the maximum value when γ= π/4 and β₂= 0.
By 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 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 basically consistent with the simulation.
The following conclusions can be drawn: 1) ACP-PMaSynRM can not only improve the utilization rate of the permanent magnet, and realize the full utilization of permanent magnet and reluctance torque, but also 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.

Key words： permanent magnet assisted synchronous reluctance motor consequent-pole flux-linkage phase shifting maximum torque

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TM352

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	Articles by authors
	Zhou Huawei
	Long Shunhai
	Jiang Guangyao
	Wang Chengming
	Liu Zhengmeng

Cite this article:

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, 0, (): 96-96.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.221805 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/96

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