Naoto Ohnuma

Title: Naoto Ohnuma: Innovator in Elevator and Mobile Body Control Technologies

Introduction

Naoto Ohnuma is a prominent inventor based in Hitachi, Japan. He has made significant contributions to the fields of elevator technology and mobile body control systems. With a total of three patents to his name, Ohnuma's work reflects a commitment to enhancing safety and efficiency in engineering.

Latest Patents

One of Ohnuma's latest patents is an innovative elevator and control method for elevators. This invention includes a car speed detection device that measures the speed of the elevator car. It features an emergency braking device that engages with the guiderail to stop the car if the speed exceeds a predetermined threshold. Additionally, the system incorporates an electric actuating unit that operates the emergency braking device, a battery for power supply during interruptions, and a safety control unit that monitors the elevator's condition. This control unit assesses the battery's remaining power and determines the proper operation of the emergency braking device when commercial power is restored.

Another notable patent is an apparatus, method, or system for controlling a mobile body. This invention allows for the control of a mobile body’s position without the need for a position detector. It estimates the magnetic pole position of a synchronous motor's rotor based on electrical quantities related to the power supplied to the motor. Consequently, the position of the mobile body is inferred from the estimated magnetic pole position.

Career Highlights

Naoto Ohnuma is associated with Hitachi, Ltd., a leading company in technology and engineering solutions. His work at Hitachi has positioned him as a key player in the development of advanced control systems and safety mechanisms in elevators and mobile technologies.

Collaborations

Ohnuma has collaborated with notable colleagues, including Toshifumi Yoshikawa and Toshisuke Mine. These partnerships have contributed to the innovative advancements in the technologies he has developed.

Conclusion

Naoto Ohnuma's contributions to elevator and mobile body control technologies demonstrate his innovative spirit and dedication to safety and efficiency. His patents reflect a deep understanding of engineering principles and a commitment to improving everyday technologies.