摘要
针对传统电机优化设计方法使用特殊形状的铁心或磁极,导致电机结构复杂、难以加工的问题,采用频谱分析的方法对内置式永磁电机和表贴式永磁电机的齿槽转矩进行研究。用有限元方法计算两种电机模型的齿槽转矩,进而由傅里叶变换得到其各次谐波的功率谱。理论分析表明,采用适当余数的分数槽电机可以消除齿槽转矩中的特定谐波分量;而优化极弧长度则可以使其谐波总量最小化。针对永磁电机齿槽转矩谐波分量较大的缺点,提出二者相结合的方法抑制永磁电机的齿槽转矩。有限元计算结果显示,优化设计后,齿槽转矩的幅值不足额定转矩的0.1%。
Traditional optimazation design methods utilize iron core and magnet poles with special shape to complicate the structure of motors and make them hard to be manufactured.The method of harmonic analysis is adopted to have an insight into the cogging torque in an interior permanent magnet motor（IPM） and a surface mounted permanent magnet motor（SPM）.Cogging torque of the two motors were calculated by finite element method（FEM） and their power spectrums were computed by Fourier transform.Theory analysis leads to a conclusion that special hamonic component can be diminished by fractional slot motor with some residue while total hamonics can be minimized by optimal magnet arc length.A combined method is proposed to eliminate the cogging torque of permanent magnet motors.The FEM results show that the magnitude of cogging torque in both motors is less than 0.1% that of the rated torque after optimization with proposed method.
出处
《电机与控制学报》
EI
CSCD
北大核心
2010年第4期36-40,45,共6页
Electric Machines and Control
关键词
永磁电机
齿槽转矩
优化设计
有限元方法
谐波分析
permanent magnet motors
cogging torque
optimization design
finite element method
harmonic analysis
