Nobuyoshi Mutoh

Title: Nobuyoshi Mutoh: Innovator in Power Conversion Technology

Introduction

Nobuyoshi Mutoh is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of power conversion technology, holding a total of 3 patents. His work focuses on improving the efficiency and reliability of motor driving systems.

Latest Patents

Mutoh's latest patents include a system using a power converter, a microsurge suppressor, and a microsurge suppression method. The motor driving system he developed incorporates an AC power supply, an AC reactor, a power converter, and a motor. A microsurge suppressor is strategically placed on the power supply line from the power converter to the motor, as well as on the line from the AC reactor to the power converter. This suppressor features a multi-layer printed wiring board with two terminals connected to the power converter and the motor, along with a capacitor designed to bypass surges. The configuration ensures that the terminal connected to the motor is directly linked to the motor's terminal, enhancing the system's overall performance.

In his patent for the system using a power converter, Mutoh addresses EMI noise reduction in systems utilizing switching control. The power converter consists of a converter, a smoothing capacitor, and an inverter, which receives power from an AC supply through an AC reactor. This setup converts the power into a desired frequency and voltage for motor supply. Damping impedance elements are incorporated between the motor frame and ground, the cooling fin of the power converter and ground, and the AC reactor and ground. The paths between these components and ground are insulated, except where the damping impedance elements are inserted.

Career Highlights

Throughout his career, Nobuyoshi Mutoh has worked with esteemed institutions such as Keio University and the Japan Society for the Promotion of Science. His research and innovations have significantly impacted the field of electrical engineering, particularly in power systems.

Collaborations

Mutoh has collaborated with various research institutions and organizations, contributing to advancements in technology and engineering practices.

Conclusion

Nobuyoshi Mutoh's innovative work in power conversion technology and his contributions to the field through his patents highlight his role as a leading inventor. His advancements continue to influence the efficiency and reliability of motor systems in various applications.