The rotor structure is one of the key factors affecting the performance of the brushless doubly fed generator (BDFG). So far, three types of rotor structure have been developed, namely the reluctance rotor, the special cage rotor, and the double sine wound rotor. However, there still exist some problems, such as the high harmonic content of the rotor winding, resulting in large losses and low efficiency of the machine, and the complex winding design and manufacturing process. These problems restrict the industrial application of the BDFG. To so...
