1. Asama, J., Amada, M., Tanabe, N., Miyamoto, N., Chiba, A., Iwasaki, S., Takemoto, M., Fukao, T. and Rahman, M.A., Evaluation of bearingless PM motor with wide magnetic gaps, IEEE Transactions on Energy Conversion, Vol.25, No.4 (2010), pp.957–964.
2. Asama, J., Fujii, Y., Oiwa, T. and Chiba, A., Novel control method for magnetic suspension and motor drive with one three-phase voltage source inverter using zero-phase current, Mechanical Engineering Journal, Vol.2, No.4 (2015), DOI:10.1299/mej.15-00116.
3. Bauer, W., Freudenthaler, P. and Amerhein, W., Experimental characterization of a bearingless rotating field axial-force/torque motor, Proceedings of the 14th International Symposium on Magnetic Bearings (ISMB) (2014), pp.132–136.
4. Fujii, Y., Asama, J., Oiwa, T. and Chiba, A., Balance control of split capacitor potential for magnetically levitated motor system using zero-phase current, Proceedings of the International Power Electronics Conference (IPEC) (2018), pp.4042–4048.
5. Fujii, Y., Asama, J., Oiwa, T. and Chiba, A., Positioning accuracy improvement for a magnetically levitated system using zero-sequence current of a permanent magnet motor, IEEJ Transactions on Industry Applications, Vol.139, No.3 (2019), pp.322–329 (in Japanese).