摘要
传统永磁辅助同步磁阻电机(PMaSynRM)无法充分利用永磁转矩和磁阻转矩,该文提出一种新型不对称交替极永磁辅助同步磁阻电机(ACP-PMaSynRM)。基于永磁磁链相移原理,将交替极永磁阵列、不对称磁极和磁障相结合,实现永磁转矩和磁阻转矩的最大值在相同电流相位下叠加,不但提高了永磁转矩和磁阻转矩的利用率,增强了电机输出转矩能力,而且减少了永磁体用量。采用有限元法对比分析了传统和新型ACP-PMaSynRM的电磁性能,验证了所提电机拓扑的可行性。最后,制造了一台48槽14极样机并对其进行了实验验证。
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 angleλto the left.Therefore,the maximum value of permanent magnet flux-linkage is shifted by an angleγfrom 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)=3/2Pψ_(pm)i_(s)cosβ_(2)+3/4pi_(s)^(2)(L_(q)-L_(d))sin 2(γ+β_(2))=T_(pm)+T_(r)It can be noticed that Tpm and Tr simultaneously reach the maximum value whenγ=π/4 andβ_(2)=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.
作者
周华伟
龙顺海
江光耀
王成明
刘正蒙
Zhou Huawei;Long Shunhai;Jiang Guangyao;Wang Chengming;Liu Zhengmeng(School of Electrical and Information Engineering,Jiangsu University,Zhenjiang 212013 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2024年第2期455-464,共10页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(52277052)
江苏高校“青蓝工程”资助项目。
关键词
永磁辅助同步磁阻电机
交替极
磁链相移
最大转矩
Permanent magnet assisted synchronous reluctance motor
consequent-pole
flux-linkage phase shifting
maximum torque
