摘 要:为了削弱直驱永磁同步发电机的齿槽转矩,根据其结构特点,研究了极弧系数和极槽配合对齿槽转矩的影响。首先,采用解析法确定了对齿槽转矩有影响的气隙磁密平方的傅里叶分解系数,并得到了傅里叶分解系数与极弧系数的变化函数关系,进而分析了极弧系数对齿槽转矩的影响,然后用有限元法对不同极弧系数下的齿槽转矩进行了计算,验证了解析法的正确性,最后,通过24台样机的设计数据,分析总结了不同极槽配合对齿槽转矩的影响规律。结果表明,合理选取极弧系数和极槽配合,可以有效削弱永磁同步发电机的齿槽转矩。 关键词:直驱永磁同步发电机;极弧系数;极槽配合;齿槽转矩;有限元法
Abstract: In order to reduce the cogging torque of directly-driven permanent magnet synchronous generator(PMSG), the effects of pole-arc coefficient and pole-slot combination on cogging torque were discussed according to PMSG’s structural features. Firstly, the airgap flux density squared Fourier decomposition coefficients was determined by using analytical method, the function relationship between the Fourier decomposition coefficients and pole-arc coefficient was also presented. The impact of pole-arc coefficient on the cogging torque was analyzed. Finite element method was then used to calculate the PMSG’s cogging torque with different pole-arc coefficients and the results verified the correctness of the analytical method. At last, the impact of slot-pole combination on the cogging torque was discussed and concluded by the design data of 24 prototypes. The results show that the cogging torque of PMSG can be reduced effectively by choosing reasonable pole-arc coefficient and slot-pole combination. Key words: directly-driven permanent magnet synchronous generator; pole-arc coefficient; slot-pole combination; cogging torque; finite element method
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