将轮辐型内置式转子和Halbach永磁阵列结合,并取消转子铁心加强筋,减小漏磁达到高聚磁同时兼顾凸极比,实现高转矩/功率密度和宽调速范围.在保证永磁体用量相同的情况下,建立新型高凸极比聚磁转子和V型转子两种电机模型,针对两者的分段转子拓扑,开展电磁性能对比分析,包括气隙磁密、凸极比、功率以及弱磁扩速能力等.同时,考虑到无转子铁心加强筋会导致转子分段存在结构强度问题,仿真验证新型高凸极比聚磁转子结构在最高转速 6000 r/min时给予碳纤维护套保护下转子结构强度的可靠性;分析温度限制下新型高凸极比转子电机的功率输出.另外,对比两种不同电机结构的振动噪声情况.最后,研制一台 16 极/72 槽新型高凸极比转子永磁电机样机,实验验证有限元分析结果的准确性.进一步说明了新型高凸极比转子永磁电机在转矩/功率密度和宽调速运行等方面的性能优势.
In this paper,the spoke-type rotor and Halbach PM array are combined then the rib is removed,which reduces the rotor flux leakage to achieve high flux concentration while considering the saliency ratio.High torque/power density and wide speed range can be achieved.Under the same volume of PMs,two models with the new rotor and V-shaped rotor are established.Then,the main electromagnetic properties are compared according to the two segmented rotor structures,including air-gap flux density,saliency ratio,field weakening capacity,and power.Meanwhile,considering the structural strength problem of the segmented rotor without rib,the rotor strength analysis result verifies the integrity of the machine with the new high saliency ratio rotor under the protection of carbon fiber at 6000 r/min.This paper also analyzes the output power of the machine with the new rotor under temperature limitation.In addition,the vibration and noise of the two models are also analyzed and compared.Finally,a 16-pole/72-slot prototype with the new high saliency ratio rotor is fabricated.The accuracy of the finite element analysis results is verified by experiments.Meanwhile,the performance of the motor with the new flux-concentrating rotor is superior to the motor with the V-shaped rotor in terms of torque/power density and wide speed range,which is further explained.