This inventor holds 4 USPTO granted patents and 2 published patent applications. Top assignee: Otis Elevator Company. Active years: 1990-1995.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile
Location History:
- Narita, JP (1990 - 1991)
- Cyoful, JP (1994)
- Tokyo, JP (1995)
Company Filing History:
Years Active: 1990-1995
Title: Kazuhiko Doi: Innovator in Induction Motor Technology
Introduction
Kazuhiko Doi is a notable inventor based in Narita, Japan. He has made significant contributions to the field of induction motor technology, holding a total of 4 patents. His work focuses on improving the efficiency and performance of induction motors, particularly in applications such as elevators.
Latest Patents
Doi's latest patents include a "Temperature compensator circuit for an induction motor" and a "Vector control method of induction motor." The temperature compensator circuit aims to provide secondary resistance low temperature compensation in vector speed control, ensuring that the motor operates efficiently even at startup. This invention utilizes a secondary time constant operator to detect the motor's secondary time constant and a comparator/register to hold and output low temperature data. The damping unit further enhances the motor's performance by maintaining damping characteristics during operation and shutdown.
The vector control method for induction motors is designed specifically for elevator applications. It allows for the quick determination of temperature-corrected secondary time constants by passing a constant current to the excitation side of the motor while the elevator is mechanically stopped. This innovation improves the precision of the determination process, enhancing the overall control of the induction motor.
Career Highlights
Kazuhiko Doi is currently employed at Otis Elevator Company, where he continues to develop innovative solutions for elevator systems. His expertise in induction motor technology has made him a valuable asset to the company.
Collaborations
Doi has collaborated with notable colleagues such as Yasutami Kito and Masayuki Mori. Their combined efforts have contributed to advancements in the field of motor control and efficiency.
Conclusion
Kazuhiko Doi's contributions to induction motor technology demonstrate his commitment to innovation and excellence. His patents reflect a deep understanding of motor dynamics and control, making a significant impact in the industry.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile