Takefumi Ito
Mitsubishi Electric
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Publication
Featured researches published by Takefumi Ito.
international symposium on discharges and electrical insulation in vacuum | 2006
Satoshi Ochi; Seiichi Miyamoto; Hiromi Koga; Norio Kan; Takakazu Harada; Takefumi Ito; Kenichi Koyama; Shin Yamade
Silver tungsten-carbide (AgWC) has been used for contact materials of low surge type vacuum interrupter because of their properties such as low chopping current and low erosion. However the interrupting capability of AgWC is relatively less than CuCr. Generally, in order to increase the interrupting capability, axial magnetic field (AMF) is applied for large rated currents. On the other hand, it is known that the contact materials greatly affect the interrupting capability and chopping current. In this paper, in order to increase the interrupting capability of low surge type vacuum interrupters, the effect of the intensity of AMF and composition of AgWC under AMF on the interrupting capability were investigated. The contents of Ag and WC were varied and cobalt (Co) was added as a third element. Also the chopping currents were investigated. As a result, it was found that an increase of Co and a decrease of Ag content tended to increase the interrupting capability
Archive | 2004
Takefumi Ito; Yuujitsushi Iwashita; Toshikazu Kawabata; Toshihiro Kurita; Takayuki Nagai; 武文 伊藤; 由実子 岩下; 俊和 川畑; 敏広 栗田; 貴之 永井
Archive | 2007
Takefumi Ito; Toshikazu Kawahata; Yumiko Iwashita; Toshihiro Kurita; Takayuki Nagai
Archive | 2004
Takefumi Ito; Takeshi Sekiguchi; Takanori Sone; Hiroyuki Teramoto; 武文 伊藤; 浩行 寺本; 孝典 曽根; 剛 関口
Archive | 2009
Takefumi Ito; Yumiko Iwashita; Toshikazu Kawabata; Susumu Kawamata; Toshihiro Kurita; 武文 伊藤; 由実子 岩下; 進 川又; 俊和 川畑; 敏広 栗田
Archive | 2008
Toshikazu Kawahata; Takefumi Ito; Takanori Sone; Yumiko Iwashita; Toshihiro Kurita
Archive | 2005
Takefumi Ito; Yuujitsushi Iwashita; Toshikazu Kawabata; Toshihiro Kurita; Takanori Sone; 武文 伊藤; 由実子 岩下; 俊和 川畑; 孝典 曽根; 敏広 栗田
Archive | 2002
Takefumi Ito; Toshinori Kimura; Kenichi Koyama; Satoshi Ochi; Norio Suga; Hiroyuki Teramoto; 伊藤 武文; 寺本 浩行; 小山 健一; 木村 俊則; 菅 則雄; 越智 聡
Archive | 2014
伊藤 武文; Takefumi Ito; 由実子 岩下; Yumiko Iwashita; 勇士 吉田; Yuji Yoshida; 慎吾 奥山; Shingo Okuyama; 啓 三枝; Kei Saegusa
Archive | 2014
伊藤 武文; Takefumi Ito; 由実子 岩下; Yumiko Iwashita; 勇士 吉田; Yuji Yoshida; 慎吾 奥山; Shingo Okuyama; 啓 三枝; Kei Saegusa
