Company Filing History:
Years Active: 1981-1982
Title: Innovations by Hideaki Rokutan
Introduction
Hideaki Rokutan is a notable inventor based in Katsuta, Japan. He has made significant contributions to the field of electric vehicle technology, holding a total of 2 patents. His work focuses on advanced motor control systems that enhance the efficiency and performance of electric motors.
Latest Patents
Rokutan's latest patents include a chopper control system and a motor control apparatus with an improved thyristor chopper circuit. The chopper control system features a thyristor chopper that connects a battery to a series motor of an electric vehicle. It utilizes a magnetic phase shifter to control the gate signal, ensuring optimal performance. When the duty factor of the chopper reaches 100%, a bypass contactor short-circuits the chopper, allowing for effective motor current management. The system can detect excessive motor current and adjust accordingly, either by releasing the bypass contactor or engaging a field-weakening resistor to accelerate the motor.
The motor control apparatus patent describes a thyristor chopper circuit that supplies current from a D-C source to an electric motor. This circuit includes main and auxiliary thyristors, along with commutating elements that generate a pulse of current to turn off the main thyristor. A saturable current transformer is also integrated into the design, enhancing the overall functionality of the motor control system.
Career Highlights
Rokutan is currently employed at Hitachi, Ltd., where he continues to innovate in the field of electric vehicle technology. His work has contributed to advancements in motor control systems, making electric vehicles more efficient and reliable.
Collaborations
Throughout his career, Rokutan has collaborated with esteemed colleagues such as Michimasa Horiuchi and Masahiko Ibamoto. These partnerships have fostered a creative environment that encourages innovation and the development of cutting-edge technologies.
Conclusion
Hideaki Rokutan's contributions to electric vehicle technology through his patents and collaborations highlight his role as a significant inventor in the field. His innovative approaches to motor control systems continue to influence the industry and pave the way for future advancements.