@article{ruviaro_rüncos_sadowski_2013,  title={Wound rotor doubly fed induction machine with radial rotary transformer},  volume={12},  ISSN={2179-1074},  url={https://doi.org/10.1590/S2179-10742013000200013},  DOI={10.1590/S2179-10742013000200013},  number={2},  journal={Journal of Microwaves, Optoelectronics and Electromagnetic Applications},  publisher={Sociedade Brasileira de Microondas e Optoeletrônica e Sociedade Brasileira de Eletromagnetismo},  author={Ruviaro, Maurício and Rüncos, Fredemar and Sadowski, Nelson},  year={2013},  month={Dec},  pages={411–426} }