Taihei Koyama
Toshiba
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Publication
Featured researches published by Taihei Koyama.
energy conversion congress and exposition | 2010
Shinichi Noda; Sueyoshi Mizuno; Taihei Koyama; Shigetomo Shiraishi
The intake of dust and dirt contained outside the air into the motor while driving causes the maintenance of dismantling and clean-up operation once every three years. Moreover, excessive acoustic noise during high-speed operation is produced by the cooling fan on the rotor. Totally enclosed airtight motor was developed not only to deal with the dust-intake problem but also to reduce acoustic noise. This motor eliminates the requirement of periodical dismantling and clean-up operation. Excessive noise of internal cooling fan was decreased by newly developed uneven pitch blade fan. Further, traction motor without external fan was developed by thermofluid simulation. Acoustic noise and temperature rise of these motor were measured and compared.
the international power electronics conference - ecce asia | 2010
Shinichi Noda; Taihei Koyama; Shigetomo Shiraishi
The intake of dust and dirt-contained outside air into the motor during the cooling process causes the requirement of dismantling and clean-up operation once every three years. Besides that, high speed of acoustic noise isi produced by the cooling fan mounted on rotor at high speed. totally enclosed, airtight-type motor was developed not only to deal with the dust intake problem and thereby eliminate the requirement of periodical dismantling and clean-up operation, but also for noise reduction purpose. Large noise of internal cooling fan was decreased by newly developed uneven pitch blade fan.
ASME 2003 Pressure Vessels and Piping Conference | 2003
Akira Sone; Arata Masuda; Taihei Koyama; Kohei Washida; Makoto Yamada; Shizuo Yamamoto
In this paper, a non-destructive damage evaluation procedure is presented, which aims at detecting early or fatal cracks in existing piles after severe earthquakes. The bending motion of a target pile excited by an impulsive load, which is induced by hammering at the ground surface nearly, is measured at the top to obtain the dynamic compliance of the pile in one direction. Numerical simulations and experiments show that evaluating the dynamic compliance in every direction can suggest the severity of the cracks as well as their location and orientation.Copyright
Archive | 2012
Takafumi Nakahama; Nobumitsu Tada; Kenya Kurokawa; Tadashi Shudo; Taihei Koyama; Takeo Kakuchi
Archive | 2007
Taihei Koyama; Shinichi Noda; Kenzo Tonoki; Shigetomo Shiraishi
Archive | 2005
Shinichi Noda; Taihei Koyama; Yoshitaka Kobayashi; Nobuyuki Yagi
Archive | 2012
Yuuki Tsukinari; Taihei Koyama; Satoru Abe; Hiroshi Ishii; Satoshi Kurosawa; Akio Sekimoto
Archive | 2007
Shin Murakami; Hitoshi Kawamoto; Kouji Sugiura; Kenzo Tonoki; Taihei Koyama; Yoshinobu Ishikawa; Yoshio Ogimura; Takayuki Kikuchi
Archive | 2007
Kazuaki Yuuki; Yosuke Nakazawa; Masato Hashimoto; Shinichi Noda; Kenzo Tonoki; Taihei Koyama; Atsuhiko Nishio; Masaki Miyairi
Archive | 2016
Akira Itoh; Taihei Koyama; Shinichi Noda; Makoto Matsushita; Toshio Hasebe; Yoshihiro Maeda
