Location History:
- Koganei, JP (1978)
- Tokyo, JP (1981 - 1982)
Company Filing History:
Years Active: 1978-1982
Title: Yutaka Koiwai: Innovator in Motor Drive Technology
Introduction
Yutaka Koiwai is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of motor drive technology, holding a total of five patents. His work focuses on enhancing the efficiency and reliability of DC and induction motor drive systems.
Latest Patents
One of Koiwai's latest patents is a driving circuit for a DC motor. This invention addresses the issue of thyristor commutation failure during transitions between power inversion and power rectification modes. The circuit includes a thyristor-controlled three-phase full-wave reversible bridge, which adjusts the firing phase based on the speed deviation between the actual and command speeds. Additionally, it features mechanisms for detecting armature current intermittence and blocking the firing of the inverter during such events.
Another notable patent is an induction motor drive apparatus. This invention aims to synchronize the actual speed of an induction motor with a command speed by varying the frequency and effective value of the applied three-phase AC voltage. The apparatus utilizes an inverter, a speed deviation signal generator, and a pulse width modulator to achieve precise control over the motor's performance.
Career Highlights
Yutaka Koiwai is currently employed at Fujitsu Fanuc Limited, where he continues to innovate in the field of motor drive technology. His expertise and inventions have significantly impacted the efficiency of motor operations in various applications.
Collaborations
Koiwai has collaborated with notable colleagues such as Shigeki Kawada and Hiroshi Ishida. Their combined efforts have contributed to advancements in motor drive systems and related technologies.
Conclusion
Yutaka Koiwai's contributions to motor drive technology through his innovative patents demonstrate his commitment to enhancing the efficiency and reliability of motor systems. His work continues to influence the industry and inspire future innovations.
Inventor’s Patent Attorneys refers to legal professionals with specialized expertise in representing inventors throughout the patent process. These attorneys assist inventors in navigating the complexities of patent law, including filing patent applications, conducting patent searches, and protecting intellectual property rights. They play a crucial role in helping inventors secure patents for their innovative creations.