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Dive into the research topics where Toshifumi Yoshikawa is active.

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Featured researches published by Toshifumi Yoshikawa.


applied power electronics conference | 2000

Analysis of parallel operation methods of PWM inverter sets for an ultra-high speed elevator

Toshifumi Yoshikawa; Hiromi Inaba; Toshisuke Mine

Characteristics of some current control schemes that are for an inverter parallel set operation and easily implemented by microprocessor, are analyzed. To analyze an inverter parallel set system, equivalent circuits separated into two groups are derived. One group generates a motor current, the other generates a cross current flowing between inverters, and they are decoupling approximately. Thus, these circuits are utilized to comprehend the behavior of an inverter parallel set system. Applying these circuits, three current control schemes based on a suboscillation current control are analyzed and a control scheme, which can regulate both the motor current and the cross current, shows excellent performance.


Archive | 1996

Control system for power transmission and distribution system

Minoru Kanoi; Yuzuru Imamura; Saburo Yasukawa; Masahiko Amano; Shinji Tanifuji; Toshifumi Yoshikawa; Masahiro Watanabe


Archive | 2002

Power supply and power supply method upon interruption of electric service

Toshifumi Yoshikawa; Yasuo Satou


Archive | 2003

MOTOR DRIVE SYSTEM AND ELEVATOR DRIVE SYSTEM

Atsuya Fujino; Sadao Hokari; Reiji Kajiwara; Shunsuke Mitsune; Hiroshi Nagase; Hirokazu Nagura; Tomoji Onishi; Kiyoshi Sato; Toshifumi Yoshikawa; 三根 俊介; 潔 佐藤; 定夫 保苅; 敏文 吉川; 寛和 名倉; 友治 大西; 令史 梶原; 篤哉 藤野; 長瀬 博


Archive | 1999

Reactive power compensation system

Kenji Abiko; Hidetoshi Aizawa; Yoshihiro Hirai; Yasuyuki Hiyama; Kazuo Takasugi; Toshifumi Yoshikawa; 敏文 吉川; 堅二 安孫子; 義浩 平井; 泰之 日山; 英俊 相澤; 和郎 高杉


Archive | 1998

Voltage reactive power control device

Masahiko Amano; Takaharu Ishida; Osamu Kubo; Saburo Yasukawa; Toshifumi Yoshikawa; 理 久保; 敏文 吉川; 雅彦 天野; 三郎 安川; 隆張 石田


Archive | 2013

ELECTRONIC SAFETY ELEVATOR

Shinsuke Inoue; Masaya Furuhashi; Hironori Fukata; Kiyoshi Okamura; Toshifumi Yoshikawa


Archive | 2006

ELEVATOR GROUP SUPERVISORY OPERATION SYSTEM AND ITS SERVICE ELEVATOR GUIDE DISPLAY METHOD

Keiichi Aida; Atsuya Fujino; Takamichi Hoshino; Tomoaki Maehara; Kazufumi Muraoka; Rei Okabe; Masaaki Tamada; Shunichi Tanae; Satoshi Toyabe; Toshifumi Yoshikawa; 敬一 会田; 知明 前原; 敏文 吉川; 令 岡部; 孝道 星野; 一史 村岡; 正昭 玉田; 俊一 田苗; 篤哉 藤野; 訓 鳥谷部


Archive | 2006

GROUP MANAGEMENT CONTROL SYSTEM AND GROUP MANAGEMENT CONTROL METHOD FOR ELEVATOR

Keiichi Aida; Atsuya Fujino; Takamichi Hoshino; Tomoaki Maehara; Kazufumi Muraoka; Rei Okabe; Masaaki Tamada; Shunichi Tanae; Satoshi Toyabe; Kenji Yoneda; Toshifumi Yoshikawa; 敬一 会田; 知明 前原; 敏文 吉川; 令 岡部; 孝道 星野; 一史 村岡; 正昭 玉田; 俊一 田苗; 健治 米田; 篤哉 藤野; 訓 鳥谷部


Archive | 2002

MOTOR DRIVER AND POWER SOURCE USED THEREFOR AND METHOD FOR REDUCING CAPACITY OF POWER SOURCE FACILITY OF MOTOR DRIVER

Sadao Hokari; Hiromi Inaba; Shunsuke Mitsune; Hiroshi Nagase; Toshifumi Yoshikawa; 三根 俊介; 定夫 保苅; 敏文 吉川; 博美 稲葉; 長瀬 博

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