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Authors = Nobuhito Ohnuma

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7 pages, 847 KiB  
Article
Development of Electric Scooter Driven by Sensorless Motor Using D-State-Observer
by Ichiro Aoshima, Masaaki Yoshikawa, Nobuhito Ohnuma and Shinji Shinnaka
World Electr. Veh. J. 2009, 3(1), 48-54; https://doi.org/10.3390/wevj3010048 - 27 Mar 2009
Cited by 2 | Viewed by 1163
Abstract
This paper presents a newly developed sensorless electric scooter, whose traction motor (IPMSM of nonsinusoidal magnetization) is controlled by a sensorless vector control method using the “D-state-observer.” Through an actual development, this paper verifies that sensorless electric scooters can be realizable, and re-verifies [...] Read more.
This paper presents a newly developed sensorless electric scooter, whose traction motor (IPMSM of nonsinusoidal magnetization) is controlled by a sensorless vector control method using the “D-state-observer.” Through an actual development, this paper verifies that sensorless electric scooters can be realizable, and re-verifies that the D-state-observer has a potential applicable to other EVs. Detailed experimental results confirming the verification are also shown. Full article
5 pages, 468 KiB  
Article
Development of Pure Electric Bus with Mn type Li-ion Battery
by Shigeru Motohira, Takashi Ogihara, Izumi Mukoyama, Takahiro Nakamura, Hironori Ozawa, Kunio Fujii, Masao Uede, Nobuhito Ohnuma, Tetsuya Futakuchi, Toshinori Watanabe and Hiroki Morino
World Electr. Veh. J. 2007, 1(1), 165-169; https://doi.org/10.3390/wevj1010165 - 28 Dec 2007
Cited by 5 | Viewed by 2392
Abstract
Aluminum-doped lithium manganese powders were successfully produced by internal combustion-type spray pyrolysis using metal nitrate solution. As-prepared particles with an average diameter of about 4 μm had a porous microstructure and were nonagglomerated. Chemical analysis showed that the molar ratio of Li/Mn and [...] Read more.
Aluminum-doped lithium manganese powders were successfully produced by internal combustion-type spray pyrolysis using metal nitrate solution. As-prepared particles with an average diameter of about 4 μm had a porous microstructure and were nonagglomerated. Chemical analysis showed that the molar ratio of Li/Mn and the content of Aluminum were kept contact with the starting solution concentration. A lithium ion battery module for electric vehicle (EV) was also developed and its performance was examined. A 53 kWh lithium ion battery module was set on an electric microbus, and then its performance was examined. Full article
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