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심기본(Ki Bon Shim),정광석(Kwang Suk Jung) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.11
As a method obtaining linear thrust force for the magnet wheel producing a strong traction torque, the concept of magnetic shield is suggested and compared with the existing approaches. Specially, as the magnet wheel, in which the permanent magnets rotate mechanically instead of ac driving to make traveling field, is physically similar with the rotary induction motor, there is a periodical force ripple in tangential direction as well as normal direction. But, the force ripple can be suppressed from a shape change of the shield plate. Namely, the change brings out a change of entry and exit effect of the circumferential field for the magnet wheel. The feasibility of the shield concept is verified from simulation and experiment.
심기본(Ki Bon Shim),박준규(Jun Kyu Park),이상헌(Sang Heon Lee),정광석(Kwang Suk Jung) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
As known generally, when permanent magnets whose poles are upward and downward in order, arranged into the circumferential direction rotate under the conducting plate, the rotating force acts on the plate as well as the repulsive force. If the magnetic field by the magnet wheel(the above rotating permanent magnets) is partially shielded, the magnet wheel over open region can be a linear induction motor. The distinct feature from induction motor is that the traveling magnet field is produced by the moving permanent magnet instead of ac current. Furthermore, a variation of the open region changes the direction of the thrust force. In this paper, we introduce a concept of the linear actuator using the magnet wheel. Under the above shielding condition, a few simulation results and its verification from a simple test setup are described.
심기본(Ki Bon Shim),정광석(Kwang Suk Jung) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
As a method obtaining linear thrust force for the magnet wheel producing a strong traction torque, the concept of magnet shield is suggested and compared with existing approaches. Specially, as the magnet wheel, in which magnets rotate mechanically instead of ac driving to make traveling field, is physically similar with the rotary induction motor, there is a periodical force ripple in tangential direction as well as normal direction. But, the force ripple can be suppressed from a change of shield plate shape, meaning that it brings out a change of entry and exit effect of magnet wheel. The feasibility of the shield concept is verified from simulation and experiment.
정광석,박준규,심기본,Jung, Kwangsuk,Park, Junkyu,Shim, Kibon 한국교통대학교 융복합기술연구소 2013 융ㆍ복합기술연구소 논문집 Vol.3 No.1
High-precision surface actuator, in which in-plane motion is realized by not two-dimensional actuator superposing linear actuators but integrated planar actuator, has been developed to cope with the severe target performance like precise motion with large envelope. It is very difficult to accomplish the performance with the traditional actuating principle. So, various methods have been tried to break through the problem. This paper discusses some meaningful trials performed in the Nano Measurement and Precision Motion Control Lab. of Korea National University of Transportation.
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정광석(Kwang-Suk Jung),박준규(Jun-Kyu Park),심기본(Ki-Bon Shim),이상헌(Sang-Heon Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Instead of linear BLDC regarded as an optimal solution for planar stage, the induction motors are chosen as driving source for the contact-free planar stage. In general, the induction motor shows a constant thrust force irrespective of its planar displacement, easy hardware implementation, relative simplicity of work-range enlargement, and straightforward kinematic metrology. However, the principle has inherent transient limitation in zero or low-speed zone. So, to implement successfully the induction motor as a servo principle, this study discusses critical issues to be solved as well as embodiment of the tried system. Specially, the early, constant settlement of AC magnetic field in the air-gap is considered as one key factor to dominate the initial transient characteristic. It is guaranteed by experimental result also.