一种分析永磁电机齿槽转矩的方法

A Method of Analyzing the Cogging Torque of Permanent Magnet Electrical Machine

提出了一种基于单个永磁体的永磁电机齿槽转矩分析方法。从单个永磁体与永磁电机产生的齿槽转矩出发,推导了电机合成齿槽转矩的解析表达式,得到了合成齿槽转矩与由单个永磁体引起的齿槽转矩的关系。以两种分数槽绕组永磁电机为例,将解析表达式分析结果与有限元分析结果进行对比。研究结果表明:在由单个永磁体引起的齿槽转矩中,只有一部分齿槽转矩谐波分量出现在合成齿槽转矩中,解析表达式与有限元分析结果一致;验证了理论分析的正确性。所提永磁电机齿槽转矩分析方法是正确有效的。

A new kind of analysis method of cogging torque of permanent magnet electrical machine is put for- ward. Based on the cogging torque produced by single permanent magnet, the expression of the total cogging torque is deduced and obtainod the relation between the total cogging torque and cogging torque caused by single perma- nent magnet. The FEA results are obtained by analyzing two different fractional-slot windings permanent magnet electrical machines to be compared with the expression results. The study shows that the total cogging torque con- tains only a part of cogging torque harmonic component from cogging torque caused by single permanent magnet, which proves that this analysis method is correct and effective.