In-wheel direct-drive is the most efficient driving mode for electric vehicles,and it is the trend for applications in the future.In this paper,a novel variable-flux outer-rotor permanent magnet synchronous motor with...In-wheel direct-drive is the most efficient driving mode for electric vehicles,and it is the trend for applications in the future.In this paper,a novel variable-flux outer-rotor permanent magnet synchronous motor with a hybrid magnetic structure design is developed.Due to the hybrid magnetic pole with Nd-Fe-B and Al-Ni-Co permanent magnet(PM),the air-gap flux can be adjusted by changing the magnetization states of Al-Ni-Co PM,which is beneficial to realize a wide range of speeds and loads from the electromagnetic structure design.Firstly,basic structure features of the motor and the flux-adjusting principle are introduced.The design and calculation method of the PM dimensions is derived based on magnetic circuit analysis.Then the Preisach hysteresis model of Al-Ni-Co PM is described and is adopted to analyze the motor performance with the coupling of the time step finite element method(FEM),and the magnetization are investigated.Finally,the operational performance of the proposed motor is obtained by simulation,which verifies the design.展开更多
目前空调BLDC(Brushless Direct Current Motor)电机技术成熟度较高,行业同质化严重,同时客户对电机的进一步降本和小型化的需求有所增加。因此提出了一种外转子拓扑结构电机,并基于Maxwell有限元仿真软件对其进行了优化设计。首先,从...目前空调BLDC(Brushless Direct Current Motor)电机技术成熟度较高,行业同质化严重,同时客户对电机的进一步降本和小型化的需求有所增加。因此提出了一种外转子拓扑结构电机,并基于Maxwell有限元仿真软件对其进行了优化设计。首先,从性能角度出发,对不同槽极的配合进行了对比分析;然后,以成本和性能为优化目标,对电机长径比、转子轭厚、永磁体厚、定子齿宽轭宽极靴厚以及槽口宽度进行了优化分析,并得到优化方案;最后,将对优化方案进行了制样验证。结果显示,相同输出功率下外转子优化方案较内转子方案电磁成本降低了19%,体积降低了16%。同时,样机实测数据与仿真数据基本一致,验证了仿真的准确性。综上,针对空调BLDC电机,外转子拓扑较现有内转子方案成本更低,功率密度更高。展开更多
基金Supported by the National Natural Science Foundation of China under Grant 51407064。
文摘In-wheel direct-drive is the most efficient driving mode for electric vehicles,and it is the trend for applications in the future.In this paper,a novel variable-flux outer-rotor permanent magnet synchronous motor with a hybrid magnetic structure design is developed.Due to the hybrid magnetic pole with Nd-Fe-B and Al-Ni-Co permanent magnet(PM),the air-gap flux can be adjusted by changing the magnetization states of Al-Ni-Co PM,which is beneficial to realize a wide range of speeds and loads from the electromagnetic structure design.Firstly,basic structure features of the motor and the flux-adjusting principle are introduced.The design and calculation method of the PM dimensions is derived based on magnetic circuit analysis.Then the Preisach hysteresis model of Al-Ni-Co PM is described and is adopted to analyze the motor performance with the coupling of the time step finite element method(FEM),and the magnetization are investigated.Finally,the operational performance of the proposed motor is obtained by simulation,which verifies the design.
文摘目前空调BLDC(Brushless Direct Current Motor)电机技术成熟度较高,行业同质化严重,同时客户对电机的进一步降本和小型化的需求有所增加。因此提出了一种外转子拓扑结构电机,并基于Maxwell有限元仿真软件对其进行了优化设计。首先,从性能角度出发,对不同槽极的配合进行了对比分析;然后,以成本和性能为优化目标,对电机长径比、转子轭厚、永磁体厚、定子齿宽轭宽极靴厚以及槽口宽度进行了优化分析,并得到优化方案;最后,将对优化方案进行了制样验证。结果显示,相同输出功率下外转子优化方案较内转子方案电磁成本降低了19%,体积降低了16%。同时,样机实测数据与仿真数据基本一致,验证了仿真的准确性。综上,针对空调BLDC电机,外转子拓扑较现有内转子方案成本更低,功率密度更高。
