Motoyasu Yoshino

Title: Motoyasu Yoshino: Innovator in Brushless Motor Technology

Introduction

Motoyasu Yoshino is a prominent inventor based in Kyoto, Japan. He has made significant contributions to the field of motor technology, particularly in the development of drive circuits for three-phase brushless motors. With a total of 6 patents to his name, Yoshino's work has had a substantial impact on the efficiency and functionality of motor systems.

Latest Patents

One of Yoshino's latest patents is a drive circuit for a three-phase brushless motor. This innovative circuit switches its three-phase outputs by producing drive signals that are displaced in phase relative to one another. A reference clock is formed from signals obtained by comparing the output voltages across the coils of the motor with a common voltage terminal. The design includes an edge detection circuit to minimize noise components generated during output switching. The resulting edge detection output is used to trigger an RS flip-flop, forming a pulse-train signal that controls the charging and discharging of a capacitor. This capacitor generates a sawtooth voltage that is compared with a predetermined reference voltage, allowing for precise control of the motor's phase displacement.

Another notable patent is related to motor control and drive circuits. In this invention, a peak level of a drive signal is detected, and a detection signal is outputted when the peak level does not reach a predetermined value. This detection signal indicates the out-of-step condition of the motor, enabling easy reactivation without the need for strict adjustments. This innovation simplifies the process of activating motor rotation, making it more efficient.

Career Highlights

Yoshino is currently associated with Rohm Co., Ltd., a company known for its advancements in semiconductor technology and electronic components. His work at Rohm has allowed him to focus on developing cutting-edge solutions for motor control systems.

Collaborations

Throughout his career, Yoshino has collaborated with notable colleagues, including Norio Fujii and Fumihiko Ito. These collaborations have contributed to the advancement of technology in their respective fields.

Conclusion

Motoyasu Yoshino's contributions to brushless motor technology exemplify his innovative spirit and dedication to engineering excellence. His patents reflect a commitment to improving motor efficiency and functionality, making a lasting impact on the industry.