Yoshio Nozaki

Title: Innovations of Yoshio Nozaki

Introduction

Yoshio Nozaki is a prominent inventor based in Katsuta, Japan. He has made significant contributions to the field of electric vehicle technology, holding three patents that showcase his innovative spirit and technical expertise. His work primarily focuses on control systems for electric motors, which are crucial for the advancement of electric vehicles.

Latest Patents

One of Nozaki's latest patents is a control system for induction motor-driven electric cars. This invention involves supplying a DC voltage to a variable voltage and variable frequency PWM inverter, which converts it into a three-phase alternating current. This current is then supplied to multiple three-phase induction motors connected to different wheels of the electric car. The inverter is controlled based on an operating frequency command, which is adjusted according to the motor speed and a voltage command. Additionally, a motor current command is set and compared with the maximum current of the motors, allowing for corrections to maintain optimal torque characteristics as speed increases.

Another notable patent is a power converter control apparatus. This apparatus includes continuously controlled converter units and on-off controlled converter units for managing powering and regenerative braking of a DC motor. It features a unit change circuit that generates operation signals in response to commands from a master controller. The system effectively applies gate signals to the converter units based on powering control or regenerative braking commands, ensuring efficient operation of the electric motor.

Career Highlights

Yoshio Nozaki is associated with Hitachi, Ltd., a leading company in technology and innovation. His work at Hitachi has allowed him to develop groundbreaking technologies that contribute to the evolution of electric vehicles. His expertise in motor control systems has positioned him as a key figure in the industry.

Collaborations

Nozaki has collaborated with notable coworkers such as Kyozo Tachibana and Shigetoshi Okamatsu. These collaborations have further enhanced the development of innovative technologies in the field of electric vehicles.

Conclusion

Yoshio Nozaki's contributions to electric vehicle technology through his patents and work at Hitachi, Ltd. highlight his role as a significant inventor in the industry. His innovative control systems for electric motors are paving the way for advancements in sustainable transportation.