In this paper, the open-circuit dc-winding-induced voltage in a wound field switched flux (WFSFs) machines is analyzed. The phenomenon of open-circuit dc-winding-induced voltage is illustrated and the mechanism is explained. Rotor skewing is proposed to reduce the open-circuit dc-winding-induced voltage, and the optimal skewing angle is analytically derived based on the analytically deduced harmonic orders of the open-circuit dc-winding-induced voltage. Finite-element (FE) analyses show that the open-circuit dc-winding-induced voltages in the analyzed 12-stator-pole partitioned stator WFSF machines having 10-, 11-, 13-, and 14-rotor-pole rotors can be effectively reduced by >94%, while the ac-winding phase-fundamental back-EMFs can be maintained by >95%. Twelve/ten-stator/rotor-pole prototypes with skewed and nonskewed rotors are built and tested to verify the analytical and FE results.

中文翻译：

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通过偏斜降低绕线式磁场开关磁通机中开路直流绕组感应电压

在本文中，分析了绕线场开关磁通 (WFSF) 机器中的开路直流绕组感应电压。阐述了开路直流绕组感应电压的现象，并解释了其机理。提出转子偏斜以降低开路直流绕组感应电压，并基于解析推导的开路直流绕组感应电压谐波次数，解析推导出最佳偏斜角。有限元 (FE) 分析表明，所分析的具有 10、11、13 和 14 转子极转子的 12 定子极分区定子 WFSF 电机中的开路直流绕组感应电压可以是有效地降低了 >94%，而交流绕组相基波反电动势可以保持 >95%。