文档介绍：定子槽宽对永磁电机齿槽转矩的影响彭润泽(上海大学机电工程与自动化学院,上海 200072 ) 摘要:本文简要介绍了齿槽转矩产生的原理,用能量法推导出齿槽转矩的解析表达式,指出可以通过改变定子槽口的大小影响相对气隙磁导进而影响齿槽转矩大小。针对定子电枢槽口宽度,本文对比了尺寸相同的整数槽和分数槽内置式永磁同步电机在不同槽口宽度下,磁路计算的方法和有限元法计算出的齿槽转矩的大小和其基波所占大小,得到了定子槽宽和齿槽转矩的关系,并揭示了磁路计算方法的指导作用。关键词:永磁同步电机;齿槽转矩;槽口宽度;有限元法 I nfluence of slut- opening on the cogging torque of permanent synchronous motor Peng Runze (School of Engineering - Mechatronics and automation, Shanghai University, Shanghai 200072, China) Abstract: This paper introduces the principle of the cogging torque and deduces the analytical expression of it. On the bass of the Fourier series of the analytical expression , the paper finds the relation between the size of slot and gap ic conductance . Circuit c alculation method and finite element method are conducted while calculating the cogging torque in both integer and fractional slot motor of the same size. Results are enumerated at different slot widths so that conclusion of slot width and cogging torque can be summed up. Results also show the guiding role of the ic circuit calculation method. Key words : PMSM; cogging torque; finite element method; slot opening; 0 引言近年来, 随着永磁材料性能不断提高和价格的不断下降, 永磁电机以其体积小、结构简单、运行可靠、功率密度高、输出转矩大、动态性能好以及电机形状和尺寸灵活多样等显著优点, 越来越广泛地应用于国防、工农业生产和日常生活中[1]. 然而永磁电机自身也存在许多问题。由于永磁电机中永磁体和开槽电枢铁心相互作用, 不可避免产生齿槽转矩, 导致转矩波动, 降低永磁电机伺服驱动系统的控制特性和运行可靠性, 影响系统的控制精度, 并引起振动、噪声等问题[2] 。如何抑制齿槽转矩成为了国内学者研究的对象。分析齿槽转矩常用的方法通常有解析法、有限元