无刷直流永磁电机的电源虽是直流电，但其内部绕组中的电流仍是交流电，其旋转部分犹如同步电机的磁极转子，其结构及电磁原理与同步电机相似。

With the power being DC, the current of inner winding of the magneto is AC, and the rotating part is just similar to the magnetic rotor of synchronous dynamo.

youdao

无刷双馈电机的结构型式及其设计方法与常规交流电机具有较大的不同。

The structure and design method of Doubly-Fed Brushless Machine (DFBM) is quite different from the conventional AC machine.

youdao