Hideyuki Kumakura

Title: Innovations by Hideyuki Kumakura

Introduction

Hideyuki Kumakura is a notable inventor based in Shizuoka, Japan. He has made significant contributions to the field of electrical engineering, particularly in the development of advanced motor technologies. With a total of two patents to his name, Kumakura's work focuses on enhancing the efficiency and functionality of synchronous motors.

Latest Patents

Kumakura's latest patents include a self-starting permanent magnet synchronous motor and a compressor and refrigeration cycle utilizing the same technology. The self-starting permanent magnet synchronous motor features a unique design where the center axis of the magnetic poles of the rotor is designated as the d-axis. An axis deviating from this by an electric angle of 90 degrees is referred to as the q-axis. This innovative design incorporates at least two starting bars arranged near the d-axis, which are positioned on the bore side of the bars near the q-axis. This arrangement allows for the generation of stable starting torque, regardless of the stator magnetic flux's generating position, thus reducing vibrations and noise during stationary operation.

The second patent, a self-starting type permanent magnet synchronous motor, consists of a stator and a rotor. The rotor is designed with a core that has multiple slots on its outer periphery, along with a cage winding made of conductive bars embedded in these slots. The rotor core also includes at least one magnet insertion hole for embedding a permanent magnet. This design maximizes the flux content generated by the cage winding during startup, enhancing the motor's performance.

Career Highlights

Kumakura is currently employed at Hitachi Appliances, Inc., where he continues to innovate and develop cutting-edge technologies. His work has significantly impacted the efficiency of electrical motors, making them more reliable and effective for various applications.

Collaborations

Kumakura has collaborated with several talented individuals in his field, including Satoshi Kikuchi and Hiroyuki Mikami. These collaborations have fostered a creative environment that encourages the exchange of ideas and advancements in technology.

Conclusion

Hideyuki Kumakura's contributions to the field of electrical engineering, particularly through his patents on self-starting permanent magnet synchronous motors, demonstrate his commitment to innovation. His work at Hitachi Appliances, Inc. and collaborations with fellow engineers highlight the importance of teamwork in driving technological advancements.