Shigetomo Shiraishi
Toshiba
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Publication
Featured researches published by Shigetomo Shiraishi.
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
Kazuaki Yuuki; H. Ueda; Shigetomo Shiraishi; S. Koizumi; Ikuo Yasuoka
We had developed a high efficiency motor drive system, that is, Direct Drive Motor (DDM) system in railway traction. However the wheel shaft voltage induced EMI problem. To solve this, we executed several tests and analysis, and it was concluded that the normal mode current of motor caused the wheel shaft voltage. Only the normal mode filter suppresses the wheel shaft voltage effectively. In this paper, we will explain about this new EMI mode particular to the DDM structure.
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.
Archive | 2003
Takashi Nagayama; Minoru Kitamura; Shigetomo Shiraishi; Tadashi Matsuura
Archive | 1997
Yosuke Nakazawa; Hideyuki Shimizu; Shigetomo Shiraishi; Kazuaki Yuki; 洋介 中沢; 秀幸 清水; 茂智 白石; 和明 結城
Archive | 2006
Takashi Nagayama; Minoru Kitamura; Shigetomo Shiraishi
Archive | 2010
Takashi Nagayama; 永山孝; Shigetomo Shiraishi; 白石茂智
Archive | 2007
Taihei Koyama; Shinichi Noda; Kenzo Tonoki; Shigetomo Shiraishi
Archive | 1994
Toshiro Hasebe; Keiichiro Kondo; Koichi Matsuoka; Shintaro Oe; Shigetomo Shiraishi; 晋太郎 大江; 孝一 松岡; 茂智 白石; 圭一郎 近藤; 寿郎 長谷部
Archive | 2000
Yosuke Nakazawa; Shigetomo Shiraishi; Kazuaki Yuki; 洋介 中沢; 茂智 白石; 和明 結城
