【目的】针对双转子异步电机在分数槽集中绕组(FSCW)结构下产生的非主导极次谐波问题,本研究旨在提出一种高效的谐波抑制方法,以降低谐波引发的电机效率损失,提升电机的运行稳定性与综合性能。【方法】首先,基于FSCW的相带划分与排布规律,采用定义法和谐波合成法分别推导了偶数槽与奇数槽的分布系数计算式,明确了不同极对数下各次谐波磁动势在轴线位置的峰谷分布特性。其次,结合分布系数的理论分析,提出了两种补偿绕组配置策略:直接补偿法通过调整补偿绕组与主绕组的相位关系,使拟抑制谐波的磁动势峰谷与主谐波反向叠加;移相补偿法则通过多组补偿绕组的相位偏移设计,实现特定次谐波的主动抵消。此外,建立了基于有限元仿真的三维电机模型验证补偿方法的有效性。【结果】通过理论计算和有限元仿真验证了所提方法能够有效地抑制特定谐波成分,并少量增强工作谐波,提高了电机的运行稳定性和效率。【结论】本研究表明,直接补偿法与移相补偿法可依据谐波峰谷分布特性灵活应用于非主导极次谐波抑制。前者适用于拟抑制谐波与工作谐波峰谷反向的场景,后者则解决二者峰谷同向时的谐波抵消难题。两种方法都可以在抑制目标谐波的同时适度增强工作谐波,为高精度电机设计与谐波治理提供了理论依据和技术支撑。

Abstract: [Objective] Aiming at the problem of non-dominant pole harmonics generated by double rotor asynchronous motors with fractional-slot concentrated winding (FSCW) structure, this study aims at proposing an efficient harmonic suppression method to reduce the harmonic-induced efficiency loss of the motor and to improve the operational stability and overall performance of the motor. [Methods] Firstly, based on the phase band division and arrangement of the FSCW, the distribution coefficients of even-slot and odd-slot were derived by the definition method and the harmonic synthesis method, respectively, and the peaks and valleys of the harmonic magnetic potentials at the axial position under the different pole-pair numbers were clarified. Secondly, combined with the theoretical analysis of the distribution coefficients, two compensation winding configurations were proposed: the direct compensation method by adjusting the phase relationship between the compensation windings and the main winding, so that the peaks and valleys of the magnetic potentials of the harmonics to be suppressed were superimposed with the main harmonics in reverse direction; and the phase-shifting compensation method by the phase-shifting design of multiple sets of compensation windings, so as to achieve the active offset of the specific subharmonics. In addition, a three-dimensional motor model based on finite element simulation was established to verify the effectiveness of the compensation method. [Results] The theoretical calculation and finite element simulation verified that the proposed methods can effectively suppress specific harmonic components and enhance the operating harmonics in small amounts, which improves the operation stability and efficiency of the motor. [Conclusion] This study shows that the direct compensation method and the phase-shift compensation method can be flexibly applied to the suppression of non-dominant pole harmonics based on the characteristics of harmonic peaks and valleys distribution. The former is suitable for the scenario where the peaks and valleys of the proposed harmonic suppression and the operating harmonics are reversed, while the latter solves the harmonic cancellation problem when the peaks and valleys of the two are in the same direction. Both methods can moderately enhance the working harmonics while suppressing the target harmonics, providing a theoretical basis and technical support for high-precision motor design and harmonic management.

中国博士后科学基金面上项目(2017M621086);江苏省配电网智能技术与装备协同创新中心开放基金项目(XTCX202405);江苏省研究生科研与实践创新计划(SJCX24_1305)