Chulho Kim

Title: Chulho Kim: Innovator in Piezoelectric Technology

Introduction

Chulho Kim is a notable inventor based in Burke, VA (US), recognized for his contributions to piezoelectric technology. With a total of 9 patents, he has made significant advancements in the field of fluid pumping and motor design.

Latest Patents

One of his latest inventions is the piezoelectric rotary pump. This high power and high torque density axial pump utilizes a torsional actuator tube directly coupled to the rotor via two one-way clutches. The cylindrical torsional actuator consists of multiple tubular piezoelectric ceramic segments, which are poled along their length and aligned in alternate polarity. When an alternating electric field is applied, the segments actuate in their shear resonance mode, causing movement perpendicular to the actuator's length. The rotary displacements from both ends of the actuator are transmitted to the rotor, resulting in unidirectional rotary motion for pumping fluids or slurry materials. This innovative design allows for a highly efficient pump, with specific values of torsional angle and torque tailored for various applications.

Another significant invention is the high power density dual-rotor device. This torsional motor comprises a tube made of electroactive material, with adjacent segments arranged in opposed directions. It features two one-way clutches and two rotors, allowing for the transmission of angular displacement to each rotor. This design enhances the efficiency and functionality of the motor.

Career Highlights

Chulho Kim has worked with esteemed organizations, including the United States Navy and the Penn State Research Foundation. His work has contributed to advancements in technology and engineering, particularly in the realm of piezoelectric applications.

Collaborations

Throughout his career, Chulho has collaborated with notable individuals such as Manfred Kahn and Raymond J. Weimer. These partnerships have fostered innovation and development in his projects.

Conclusion

Chulho Kim's innovative work in piezoelectric technology has led to significant advancements in fluid pumping and motor design. His contributions continue to influence the field and inspire future innovations.