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마그네틱 능동형 가이드와이어 및 자기장 제어 시스템 연구
전국홍(Guk Hong Jeon),백인철(In-Chul, Baek),김성훈(Sung Hoon Kim) 제어로봇시스템학회 2018 제어·로봇·시스템학회 논문지 Vol.24 No.4
This paper proposed magnetic field control system and active guidewire mechanism for active locomotion with steering function. Using a three-axis Helmholtz coil. The active guidewire consists of a permanent cylindrical magnet, a spiral blade, and a wire. The fabricated spiral-type end-effector is synchronized by the applied rotating magnetic field. To generate a uniform rotating magnetic field, we developed a three-axis Helmholtz coil with control software. Through simulation with various experimental analysis, we verified the performance of the developed magnetic manipulating system with the active guidewire.
황승찬(Seung Chan Hwang),김성훈(Sung Hoon Kim),전국홍(Guk-Hong Jeon) 한국자기학회 2019 韓國磁氣學會誌 Vol.29 No.2
In this study, we introduce PID control-based 1-axis magnetic levitation system. Our goal is to develop a low cost educational system. We use SMPS instead of variable DC power supply. If the DC resistance of the coil does not change, the current or voltage cannot be adjusted when SMPS is used. In this study, the current of the driving coil is controlled by using the pulse width modulation (PWM). PWM control is a method that can control the current flowing in the coil even if voltage and resistance are fixed. The problem of using the Hall sensor for position detection and a method for solving it are suggested. In order to verify the proposed method, various simulations and experiments were conducted. The distance between the magnet and the coil to be floated is within 3 cm and it is driven by 7A maximum.