Issued Patents All Time
Showing 1–25 of 51 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7869232 | Electric power converter suppressing output voltage variation due to input voltage fluctuation | Koichiro Nagata, Shigetoshi Okamatsu, Koichi Miyazaki | 2011-01-11 |
| 7671558 | Induction motor controller | Kouki Yamamoto, Hiroyuki Tomita, Yoshitaka Iwaji, Koichiro Nagata | 2010-03-02 |
| 7545116 | Driver for induction motor and method of driving the same | Koichiro Nagata, Kouki Yamamoto, Hiroyuki Tomita | 2009-06-09 |
| 7332888 | Driving apparatus for a motor | Koichiro Nagata, Haruo Nemoto, Toshio Katayama | 2008-02-19 |
| 6844700 | Inverter apparatus | Keijiro Sakai, Kinya Nakatsu, Hiroyuki Tomita, Junji Kato, Teiichi Furukawa | 2005-01-18 |
| 6841911 | Machine tool | Houng Joong Kim | 2005-01-11 |
| 6741063 | Inverter apparatus | Keijiro Sakai, Kinya Nakatsu, Hiroyuki Tomita, Junji Kato, Teiichi Furukawa | 2004-05-25 |
| 6704212 | PWM inverter with long carrier wave insertion | Teiichi Furukawa, Masahiro Hiraga, Hiroyuki Tomita, Seiji Ishida | 2004-03-09 |
| 6670786 | Apparatus for controlling an induction motor | Kazuaki Tobari | 2003-12-30 |
| 6657412 | Pulse width modulation method, pulse width modulator and power converter | Seiji Ishida, Keijiro Sakai, Hiroshi Fujii, Hiroyuki Tomita, Tatsuo Ando +2 more | 2003-12-02 |
| 6646896 | Controller of AC machine | Yoshitoshi Akita, Koichiro Nagata, Shigetoshi Okamatsu | 2003-11-11 |
| 6642689 | Control apparatus for power converter | Seiji Ishida, Takashi Ogawa, Tetsuo Kojima, Kiyoshi Nakata | 2003-11-04 |
| 6633495 | DC apparatus and vehicle using the same | Seiji Ishda, Tetsuo Kojima, Kiyoshi Nakata, Akira Horie | 2003-10-14 |
| 6611125 | Method for calculating inertia moment and driver for electric motor | Koichiro Nagata, Hiroshi Fujii, Shigetoshi Okamatsu | 2003-08-26 |
| 6556460 | Method for controlling a vehicle provided with an electric power converter | Seiji Ishida, Tetsuo Kojima, Kiyoshi Nakata, Akira Horie | 2003-04-29 |
| 6556464 | PWM converter system | Keijirou Sakai, Kinya Nakatsu, Seiji Ishida, Hiroshi Fujii, Junji Kato +1 more | 2003-04-29 |
| 6496397 | Inverter device | Keijiro Sakai, Kinya Nakatsu, Seiji Ishida, Hiroshi Fujii, Junji Kato +1 more | 2002-12-17 |
| 6344726 | Method of controlling an induction motor | Kazuaki Tobari | 2002-02-05 |
| 6300741 | Speed controlling method for induction motor | — | 2001-10-09 |
| 6229719 | Method of inverter control and apparatus of the same | Keijiro Sakai, Hiroshi Fujii | 2001-05-08 |
| 5808442 | Method of charging a plurality of lithium ion rechargeable batteries | Osamu Kaite | 1998-09-15 |
| 5475293 | Method for measuring characteristic constants of alternating current motor and controller thereof based on said method | Keijiro Sakai, Tsunehiro Endo, Hiroshi Fujii | 1995-12-12 |
| 5414339 | Electric vehicle control system | Ryoso Masaki, Nobuyoshi Mutoh, Tsutomu Ohmae | 1995-05-09 |
| 5355749 | Control apparatus and control method for motor drive vehicle | Sanshiro Obara, Ryoso Masaki, Tsutomu Ohmae, Keigo Naoi, Makoto Shioya | 1994-10-18 |
| 5033565 | Motor-driven power steering apparatus | Toshimi Abukawa, Kazuo Tahara, Katsuji Marumoto, Toshiyuki Koterazawa, Mitsuyuki Hombu +6 more | 1991-07-23 |