切向结构永磁同步电机漏磁系数分析与计算

Analysis and calculation of the leakage coefficient of spoke type permanent magnet synchronous motor

针对切向结构永磁同步电机漏磁系数不易准确选取的问题,依据等效磁路法,提出一种“先合并,后分离”的方法来计算切向结构永磁同步电机漏磁系数。分析切向结构永磁电机的磁通分布,将磁通划分为定子侧磁通与转子侧漏磁通。将定子侧主磁通与齿顶漏磁通合并为气隙磁通,给出气隙磁通与转子侧漏磁通的等效磁路图,建立各磁路等效磁阻的数学模型。根据齿顶漏磁通与主磁通在气隙中所占路径面积之比,将气隙磁通重新分离为主磁通和齿顶漏磁通,进而求取电机的漏磁系数。在此基础上,进一步分析非导磁衬套厚度的选取以及气隙长度对电机漏磁系数的影响。最后对所提出方法进行验证,解析结果与有限元结果、样机试验结果比较,三者误差很小,验证了所研究内容的准确性。

There exists the problem of spoke type permanent magnet synchronous motor being difficult to select the leakage coefficient accurately.A“merge first,then separate”method based on equivalent magnetic circuit is proposed to calculate the leakage coefficient of spoke type permanent magnet synchronous motor.Flux was divided into the stator-side flux and the rotor-side flux based on the analyzing results of its distribution.The main flux and the tooth-tip leakage flux on stator side were combined into the air gap flux,and then the equivalent magnetic circuit diagram and mathematical model of the air gap flux and the leakage flux on rotor side were given.The leakage coefficient of the motor can be obtained after the air gap flux being separated from main flux and tooth tip leakage flux in accordance with the ratio of the area of their paths in air gap.As an extension,the choice of the thickness of the non-magnetism bush and the influence of the air gap length on the leakage coefficient were further investigated.Finally,the predicated results were compared with the results of finite element analysis and prototype test.The error of the three is very small,which verifies the accuracy of the research content.