Kazushige Hotta

Title: Kazushige Hotta: Innovator in Power Conversion Technology

Introduction

Kazushige Hotta is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of power conversion technology, holding three patents that showcase his innovative spirit and technical expertise.

Latest Patents

Hotta's latest patents include a speed calculation device and a power conversion device. The speed calculation device aims to provide a speed detection method that maintains fine time axis resolution. This device utilizes an inverter to convert DC voltage into AC voltage, supplying it to a motor. It features a motor speed calculation unit that calculates the motor's speed from output pulses obtained from an encoder connected to the motor. The control unit receives the motor speed and manages the inverter accordingly. The motor speed calculation unit measures the duty cycle of the output pulses, calculating speed based on half cycles if the duty cycle is within a prescribed range from 50%, and using full cycles if it is outside that range.

Another notable patent is the voltage imbalance assessment method for a power conversion device. This method involves a forward converter that rectifies the voltage of a three-phase AC power supply. It includes a smoothing capacitor, a detection unit for the smoothed voltage, and a control unit. The control unit generates data indicating frequency components from the detected voltage and assesses the voltage imbalance of the three-phase AC power supply based on the comparison of frequency components.

Career Highlights

Kazushige Hotta is currently employed at Hitachi Industrial Equipment Systems Co., Ltd. His work at this esteemed company has allowed him to develop and refine his innovative ideas in power conversion technology.

Collaborations

Throughout his career, Hotta has collaborated with talented individuals such as Yusuke Arao and Hiroshi Watanabe. These collaborations have contributed to the advancement of his projects and the successful development of his patents.

Conclusion

Kazushige Hotta is a distinguished inventor whose work in power conversion technology has led to significant advancements in the field. His innovative patents reflect his commitment to improving technology and enhancing efficiency in power systems.