Kiyoshi Oku

Title: Kiyoshi Oku: Innovator in Synchronous Machine Technology

Introduction

Kiyoshi Oku is a notable inventor based in Osaka, Japan. He has made significant contributions to the field of synchronous machine technology, holding 2 patents that focus on improving the efficiency and functionality of these machines.

Latest Patents

One of his latest patents is a "Synchronous machine excitation control device for absorbing harmonics." This device controls the excitation of a synchronous machine to absorb harmonic currents of a specified order that are superimposed onto the current flowing between an electric power system and the synchronous machine. The device utilizes a harmonic detector that selectively passes a harmonic component of the order of 6n±1, detected by a current transformer. The pass signal is then converted into components on orthogonal axes in a rotating coordinate system, allowing for the cancellation of the specified harmonic current.

Another significant patent is the "Synchronous machine with harmonics dampening." This invention effectively absorbs higher harmonics in an AC system linked to the synchronous machine. It features a damper winding on each magnetic pole, capacitors connected in parallel with divisions of the damper winding, and a DC reactor that blocks higher harmonics from flowing into the DC power supply. The design aims to greatly reduce the impedance of the damper winding and field circuit, thereby extinguishing or reducing higher harmonics in the AC system.

Career Highlights

Kiyoshi Oku has worked with prominent companies such as Kansai Electric Power Co., Inc. and Fuji Electric Co., Ltd. His experience in these organizations has contributed to his expertise in synchronous machine technology and innovation.

Collaborations

Throughout his career, Kiyoshi has collaborated with notable colleagues, including Yoshisuke Ueda and Fuyuto Takase. These partnerships have likely enhanced his work and led to further advancements in the field.

Conclusion

Kiyoshi Oku's contributions to synchronous machine technology through his innovative patents demonstrate his commitment to improving electrical systems. His work continues to influence the industry and pave the way for future advancements.