Abstract

Justek has redefined the landscape of linear motor technology through groundbreaking innovations in moving magnet systems, air bearing linear motors, and water-cooled linear motors in the Korean industrial market. This keynote will delve into these technological advancements, highlighting their transformative potential across various high-precision industries.

1. Moving Magnet Linear Motors (LMS):
Justek’s LMS integrates advanced AI capabilities, akin to autonomous driving, enabling users to focus solely on machine operations without worrying about logistics flow. The motors feature an all-in-one design that combines coils, sensors, and drivers for optimized performance. Furthermore, through innovative design, Justek has minimized edge effects and cogging, creating a moving magnet system with unparalleled precision and efficiency.
2. Air Bearing Linear Motors:
Leveraging MMC composite materials, Justek has developed ultra-lightweight, high-precision air bearing guides, surpassing traditional porous puck or grooved granite designs. These innovations result in exceptional straightness and enable high-speed travel exceeding 2 m/s. To complement this, Justek has implemented a reaction force compensation algorithm and stage configuration, minimizing residual vibrations during high-speed operation and achieving nanometer-level precision in dynamic motion.
3. Water-Cooled Linear Motors:
Justek’s adoption of cutting-edge CFRP (Carbon Fiber Reinforced Polymer) water cooling jackets marks a significant leap in thermal management. These systems are lighter and more efficient than conventional water cooling solutions, ensuring superior cooling performance and reliability in demanding applications.

This keynote will showcase the challenges and breakthroughs encountered during the development of these advanced technologies, illustrating their impact on precision automation, high-speed manufacturing, and other critical applications. By sharing Justek’s vision for the future of linear motor systems, this presentation aims to inspire collaboration and further innovation in the field of precision motion.

Biography

Dr. Chang-young Lee is a principal researcher of Korea Railroad Research Institute(KRRI) & New transportation innovative research center. He worked at LS cable from 1995 to 2005, where he conducted R&D program on High-Tc superconducting power cables. Since 2006, he has dedicated to develop propulsion and magnetic levitation technologies for high-speed maglev at KRRI. He contributed to develop 500km/h high-speed Maglev(SUMA) and 1000 km/h Hypertube of Korea. Currently, he is the project leader of Hypertube research program in Korea.

Abstract

Korea Railroad Research Institute(KRRI) has researched on 1000 km/h Hypertube(Korean Hyperloop, HTX), which is based on high-speed superconducting maglev technology. To prove the speed feasibility of Hypertube, a small-scale Hypertube model was developed and successfully demonstrated up to 1,210 km/h at the vacuum condition of 1 mbar. A prototype superconducting linear synchronous motor using cryocooler-free high-Tc superconducting magnet was developed and tested at 150m track. Hypertube uses high-density super concrete as a tube material. A prototype full-scale tube was developed and tested successfully by Korea Institute of Civil Engineering and Building Technology(KICT). Conceptual design and R&D status on Hypertube will be introduced in the speech.

Biography

Toshihiko Sugiura obtained his PhD in nuclear engineering from the University of Tokyo in 1991 for his research on electromagnetic field analysis of fusion reactor first walls and superconductors. During his doctoral period, he had the opportunity to conduct applied research on high-temperature superconductivity under the supervision of Professor F.C. Moon of Cornell University, who is renowned for his work on superconducting applications and nonlinear dynamics.
At Toshiba Corporation, where he worked from 1991 to 1994, he was involved in the development and design of superconducting coils for use in accelerators. He is now a professor of mechanical engineering at the Faculty of Science and Technology, Keio University, Japan. His laboratory's energy is focused on investigating electro-mechanical coupling and nonlinear dynamics of mechanical systems by analyses and experiments. Topics of his research include nonlinear oscillation of superconducting magnetic levitation systems, ultrasonic nondestructive evaluation of structures, and the dynamics of microbubbles for applications such as ultrasonic cleaning, ultrasound contrast agents and drug delivery.

Abstract

My presentation will focus on nonlinear dynamical phenomena occurring in superconducting magnetic levitation systems. High-temperature superconducting magnetic levitation systems can achieve contactless and stable levitation without the need for control, thus avoiding energy loss due to friction and the generation of impure debris. This feature is expected to be used in applications such as linear drive transport and flywheels for power storage. The evaluation of the dynamical characteristics of such systems is an important issue in their mechanical design. Unlike mechanically supported conventional systems, the dynamics of those systems are characterized primarily by low damping due to non-contact support and stability resulting from the pinning force of the superconductor. Another important feature is that, due to their low damping, nonlinear vibration phenomena caused by the nonlinearity of electromagnetic forces are also likely to occur. Examples of such phenomena include bending of the resonance peak in frequency responses to low frequency side and super-harmonic and sub-harmonic resonance. Furthermore, more complicated vibrations can also be caused by the nonlinear coupling of multiple degrees of freedom via electromagnetic forces. Examples are internal resonance, autoparametric excitation, combination resonance, and mode localization. Safety design of high-temperature superconducting magnetic support systems must be based on a thorough understanding of the characteristics of nonlinear dynamics that cannot be predicted in the linear regime. Methods to passively suppress the resonances of these levitation systems and to utilize their non-linear resonances are currently under investigation. The progress of these studies will also be presented.