Keijiro Igarashi

Title: The Innovations of Keijiro Igarashi: A Pioneer in Motor Technology

Introduction

Keijiro Igarashi, a distinguished inventor based in Ota, Japan, has made significant contributions to the field of motor technology with a total of nine patents to his name. His groundbreaking work at Sanyo Electric Co., Ltd. has led to advancements in synchronous induction motors and brushless DC motors, enhancing their efficiency and performance.

Latest Patents

Among Igarashi's latest inventions are the synchronous induction motor and manufacturing method, as well as a hermetic electric compressor. The synchronous induction motor is particularly noteworthy, featuring improved assemblability of the rotor, significantly reduced production costs, and enhanced operational performance. This innovative design incorporates a plurality of die-cast secondary conductors surrounding a rotor yoke. The end rings are die-cast integrally with these conductors, ensuring robust construction. Permanent magnets are strategically inserted into slots that penetrate the rotor yoke, while end surface members, which are made from a non-magnetic constituent, secure the assembly.

Additionally, Igarashi's brushless DC motor employs a unique concentrated winding type design, which includes a stator formed by laminations of a ferro-magnetic material. This motor design minimizes stress during the winding process, ultimately enhancing performance.

Career Highlights

Throughout his career with Sanyo Electric Co., Ltd., Igarashi has established himself as a leading figure in motor innovation. His nine patents reflect a commitment to improving motor technology, making it more efficient and cost-effective. His inventions have not only advanced his company’s product offerings but have also contributed significantly to the industry's overall advancement.

Collaborations

Igarashi works alongside notable colleagues in the field, including Kazuhiko Arai and Masaaki Takezawa. These collaborations have fostered an environment of innovation and creativity, leading to several pioneering patents that continue to push the boundaries of motor technology.

Conclusion

Keijiro Igarashi's contributions to synchronous induction motors and brushless DC motors underscore his status as a key innovator in the field. With a rich patent portfolio and a focus on enhancing technological efficiencies, Igarashi's work at Sanyo Electric Co., Ltd. promises to influence the future of motor technology for years to come.