This manuscript proposes a wye-delta winding configuration for brushless operation of a wound field synchronous machine (BL-WFSM). In existing third harmonically excited BL-WFSM topologies, the additional third harmonic component of the stator magnetomotive force (MMF) was produced by an extra thyristor drive circuit or by utilizing an additional inverter. In the proposed single inverter topology, the stator winding is divided into two coil sets: the wye coil and delta coil. Triplen harmonic currents are produced owing to the delta coils set and start to circulate in the delta coils. This triplen harmonic circulating currents produce a triplen harmonic pulsating MMF in the airgap. The additional triplen harmonic pulsating MMF induces voltage in the rotor harmonic winding. This induced voltage in the harmonic winding is used to excite the rotor field. A 2D finite element analysis is performed, and the simulation results confirmed the operation principle of the proposed brushless topology.

中文翻译：

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星形-三角形绕组配置，用于无刷操作的绕线同步电机

该手稿提出了用于绕线励磁同步电机（BL-WFSM）的无刷操作的星形-三角形绕组配置。在现有的三次谐波励磁BL-WFSM拓扑中，定子磁通势（MMF）的附加三次谐波分量是通过附加的晶闸管驱动电路或利用附加的逆变器产生的。在提出的单逆变器拓扑中，定子绕组分为两个线圈组：星形线圈和三角形线圈。由于设置了三角形线圈，因此会产生三次谐波电流，并开始在三角形线圈中循环。该三次谐波循环电流在气隙中产生三次谐波脉动MMF。附加的三次谐波脉动MMF在转子谐波绕组中感应出电压。谐波绕组中的感应电压用于激励转子磁场。进行了二维有限元分析，仿真结果证实了所提出的无刷拓扑的工作原理。