Kenji Tojo
Hitachi
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Publication
Featured researches published by Kenji Tojo.
international conference on electrical machines and systems | 2009
Satoshi Kikuchi; Akeshi Takahashi; Hiroyuki Mikami; Shinichi Wakui; Hakuei Kou; Keiji Tanaka; Masashi Miyake; Tomio Yoshikawa; Kenji Tojo
A lot of saving energy policies are being globally instituted from the viewpoints of global warming and environmental preservation. Although a lot of effort has been put into improving industrial air conditioners, there are still efficiency problems with multisystem air conditioners in buildings where constant speed scroll compressors are used. We present the measurement results of a self-starting permanent magnet synchronous motor applied to a compressor drive. Compared with an isometric induction motor, efficiency improvements of 9% and 7% were confirmed for rated operation under 50 Hz and 60 Hz, respectively. The power factors also increased by 17% and 10% for the same rated operations, respectively. Moreover, the efficiency of the compressor equipped with the proposed motor was 9% and 7% higher than that with the conventional induction motor, under 50 Hz and 60 Hz operations, respectively. This result is consistent with the efficiency improvement of the proposed motor itself.
Archive | 2014
Kunihiko Takao; Kenji Tojo; Isao Hayase; Yukio Takahashi; Masaru Ito
Archive | 1983
Nobukatsu Arai; Shigeru Machida; Eiji Sato; Kenji Tojo; Naoshi Uchikawa
Archive | 1980
Kenji Tojo; Taisei Hosoda; Masato Ikegawa; Masao Shiibayashi
Archive | 1983
Kazutaka Suefuji; Kensaku Oguni; Sumihisa Kotani; Kenji Tojo
Archive | 1978
Kenji Tojo; Hirokatu Kousokabe; Nobukatsu Arai; Eiji Sato
Archive | 1984
Eiichi Hazaki; Masaya Imai; Kenji Tojo; Masao Shiibayashi
Archive | 1987
Kenji Tojo; Yuzo Kadomukai; Kunihiko Takao; Yozo Nakamura; Atsushi Suginuma; Isao Hayase; Yukio Takahashi
Archive | 2001
Hirokatsu Kohsokabe; Masahiro Takebayashi; Shunichi Mitsuya; Hiroaki Hata; Yasuhiro Ohshima; Kenji Tojo
Archive | 1988
Kenji Tojo; Shigeru Machida; Kenji Mori