Hybrid Multi-DOF Motor for Multi-Copter Unmanned Aerial Vehicle Lee, Ho-Joon ; Liu, Huai-Cong ; Lee, Jae-Jun ; Lee, Ju ; Jung, Dong-Hoon Abstract Publication: IEEE Transactions on Magnetics Pub Date: June 2019 DOI: 10.1109/TMAG.2019.2895135 Bibcode: 2019ITM....5595135L