Kohei Ishii

Title: Kohei Ishii: Innovator in Permanent Magnet Technology

Introduction

Kohei Ishii is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of electrical engineering, particularly in the development of advanced air conditioning systems and rotating electric machines. With a total of three patents to his name, Ishii's work exemplifies innovation and technical expertise.

Latest Patents

Ishii's latest patents include an air conditioner featuring a permanent magnet rotating electric machine. This innovative air conditioner comprises a compressor that includes a compression unit and a permanent magnet rotating electric machine. The machine features a stator with concentratively wound armature windings that surround multiple teeth formed in a stator core. Additionally, the rotor contains permanent magnets arranged in a convex V-shaped or U-shaped configuration with respect to the rotor axis. This design enhances torque generated by magnetic flux while reducing armature reaction magnetic flux, leading to improved efficiency and performance.

Another notable patent is for a permanent magnet rotating electric machine that also utilizes a stator with concentrated windings. The rotor in this machine is designed with permanent magnets that are similarly arranged in convex V-shaped or U-shaped configurations. The design includes nearly V-shaped recess portions between adjacent poles, which further optimizes the machine's performance by stabilizing its operation even when driven by a position sensorless inverter.

Career Highlights

Kohei Ishii is currently employed at Hitachi, Ltd., a leading company in technology and innovation. His work at Hitachi has allowed him to collaborate with other talented engineers and researchers, contributing to the advancement of electrical engineering technologies.

Collaborations

Ishii has worked alongside notable colleagues such as Haruo Koharagi and Masaharu Senoh. Their collaborative efforts have played a crucial role in the development of innovative technologies within the company.

Conclusion

Kohei Ishii's contributions to the field of electrical engineering, particularly in the area of permanent magnet technology, highlight his innovative spirit and technical prowess. His patents reflect a commitment to enhancing the efficiency and performance of electrical machines, making a significant impact in the industry.