Hiroyuki Tamagawa

Title: Innovations by Hiroyuki Tamagawa

Introduction

Hiroyuki Tamagawa is a notable inventor based in Tokyo, Japan. He has made significant contributions to the field of motor drive technology, holding a total of 5 patents. His work focuses on enhancing the efficiency and performance of brushless motors.

Latest Patents

Tamagawa's latest patents include a motor drive apparatus designed to drive a 3-phase brushless motor without the use of a hall sensor. This innovative apparatus features a comparison circuit that evaluates the voltages of the 3-phase coil terminals against the voltage of a neutral point terminal. It accurately determines which voltage is higher or lower, enabling precise zero ampere current detection. This allows for the detection of the zero cross point of the voltage in the position detection phase without introducing a mask period. Another significant patent is a motor driving circuit that includes an induced voltage detecting circuit, a rotation speed/phase detecting circuit, and an output matrix circuit. This design generates multiple control signals based on the detection results, significantly reducing motor driving noise while improving efficiency through sinusoidal waveform shaping of output currents.

Career Highlights

Throughout his career, Tamagawa has worked with prominent companies, including Mitsubishi Electric Corporation. His experience in these organizations has contributed to his expertise in motor technology and innovation.

Collaborations

Tamagawa has collaborated with notable individuals in his field, including Satoshi Narumi and Toshiya Suzuki. These partnerships have likely fostered a creative environment that encourages innovation and the development of advanced technologies.

Conclusion

Hiroyuki Tamagawa's contributions to motor drive technology exemplify his innovative spirit and dedication to enhancing efficiency in engineering. His patents reflect a deep understanding of motor systems and a commitment to advancing the field.