Isao Tadenuma

Title: Isao Tadenuma: Innovator in Elevator Technology

Introduction

Isao Tadenuma is a notable inventor based in Inazawa, Japan. He has made significant contributions to the field of elevator technology, particularly through his innovative patent related to velocity control in elevators. His work has implications for improving the efficiency and performance of elevator systems.

Latest Patents

Tadenuma holds a patent for a "Velocity control apparatus for an elevator." This invention involves an inverter that supplies alternating current (A.C.) power to a motor driving the elevator cage. The inverter is feedback-controlled by detecting A.C. power through a detector. This detector provides an output, known as offset voltage, even when the inverter is not in operation. The output value fluctuates with changes in environmental conditions, such as temperature variations. These fluctuations can affect the inverter's performance, leading to torque ripple in the motor. Tadenuma's invention addresses this issue by sensing the offset voltage and adjusting the drive control signal for the inverter accordingly, thereby reducing torque ripple during operation.

Career Highlights

Isao Tadenuma is associated with Mitsubishi Electric Corporation, a leading company in the field of electrical and electronic equipment. His work at Mitsubishi has allowed him to focus on innovative solutions that enhance the functionality and reliability of elevator systems.

Collaborations

Tadenuma has collaborated with Tooru Tanahashi, a fellow innovator, to further develop and refine his inventions in elevator technology.

Conclusion

Isao Tadenuma's contributions to elevator technology through his innovative patent demonstrate his commitment to improving the efficiency and performance of these essential systems. His work continues to influence the industry and pave the way for future advancements.