자기 폐회로를 갖는 축형 마그네틱 기어

정광석(Kwang Suk Jung) 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.7

마그네틱 셔터 기어는 원주상에 마주하는 영구자석 레이어간의 자기장을 고조파 모듈레이터를 통해 동기화시켜 동력을 전달하는 장치이다. 이러한 장치는 기계식 감속기에 필적할만한 토크를 발생시키기 위해 과다한 희토류 영구자석이 이용되기 때문에 본 논문에서는 영구자석간의 자기 경로를 변화시켜 영구자석의 양을 기존 마그네틱 기어 대비 50% 수준으로 감소시킨 새로운 방식의 축형 마그네틱 기어를 제안한다. 제안한 시스템의 토크 크기는 공극 자기장의 고조파 분석과 유한 요소 해석을 통해 기존 시스템과 비교된다. 모듈레이터 두께와 개방비가 전달 토크의 크기에 영향을 미치는 주요 설계변수로 고려되어 민감도 해석이 수행되며 고속측과 저속측의 영구자석 극수에 의해 결정되는 기어비에 따른 코깅의 크기가 분석된다. 기계적인 접촉없이 커플링되어 동력을 전달하는 고속측과 저속측 사이의 동적 지배 모델이 유도된다. 2관성 공진계의 동특성을 갖는 유도된 모델을 기초로 하여 선형 제어기를 설계하여 고속측의 계단 입력 위치 제어를 수행하였다. A magnetic shutter gear is a device that transfers mechanical power by synchronizing the magnetic field between permanent magnet layers facing circumferentially through a harmonic modulator. However, magnetic gears uses many rare-earth permanent magnets to guarantee comparable torque density to that of mechanical reducer. Hence, we propose a novel axial magnetic gear with a dramatically reduced number of permanent magnets and a closed magnetic path. The torque of the system was compared to that of an existing shutter gear through a harmonic analysis of the air-gap magnetic field. The modulator thickness and open ratio were considered as the primary design parameters, and the cogging effect was analyzed for variation of the reduction ratio. A dynamic model between the high-speed side and low-speed side was derived, and position control was performed for a constructed hardware implementation.

대지전계 측정을 위한 필드밀 센서의 설계

정광석(Kwang-Seok Jung),최민식(Min-Sik Choi),윤장현(Jang-Hyun Yoon),길경석(Gyung-Suk Kil) 한국조명·전기설비학회 2014 한국조명·전기설비학회 학술대회논문집 Vol.2014 No.5

패밀리 레스토랑 이벤트 활동이 고객의 관계지향성과에 미치는 영향

정광석(Kwang Suk Jung),김종원(Chong Won Kim),김정경(Jeong Kyong Kim) 한국호텔외식관광경영학회 2002 호텔경영학연구 Vol.11 No.1

The purpose of this study is as follows; first, to examine systematically visual security of assessment on event activities at the family restaurants and it`s contribution on the inclination of the customer relationship, second, to examine the efficient marketing plans of events at the family restaurants, for maximizing the enterprise profits with efficient management. The data of this study was taken from five foreign brand family restaurants(T.G.I. Friday`s, Bennigan`s, Sizzler, Outback steakhouse, Marche`) run in Seoul, Korea. It was surveyed to every 5th customers who visited from May, 1, 2001 to May, 20, 2001 and December, 20, 2001 to December, 31, 2001 in the family restaurants by an interview method of self-filling up. The results were as followings; Sales service group, low income earner group, young age-group and female group in variability verification of each group by demographic characteristics are perceived highly effect and valuation on event activities. In the difference of each group by use form the groups such as frequent visiting group, group accompanied by friends and family, highly paid group and a benefit club or a graduates` association are perceived highly effect and valuation on event activities. The factors affected to the relationship inclination of the customers, visiting the family restaurants should be embossed customer care factor in the relational quality (satisfaction, credibility) and necessary systematical approach on publicity and guidance factor in the relationship result(repurchase intention, recommendation and support)

자기차륜을 이용한 전도성 평판 이송 시스템에서 평판 위치 제어를 위한 새로운 방법

정광석(Kwang Suk Jung) 한국생산제조학회 2013 한국생산제조학회지 Vol.22 No.6

Two-axial electrodynamic forces generated on a conductive plate by a partially shielded magnet wheel are strongly coupled throughthe rotational speed of the wheel. To control the spatial position of the plate using magnet wheels, the forces should be handled independently. Thus, three methods are proposed in this paper. First, considering that a relative ratio between two forces is independent of the length of the air-gap from the top of the wheel, it is possible to indirectly control the in-plane position of the plate using only the normal forces. In doing so, the control inputs for in-plane motion are converted into the target positions forout-of-plane motion. Second, the tangential direction of the open area of the shield plate and the rotational speed of the wheel become the new control variables. Third, the absolute magnitude of the open area is varied, instead of rotating the open area. The forces are determined simply by using a linear controller, and the relative ratio between the forces creates a unique wheel speed. The above methods were verified experimentally.

레퍼런스 패턴 기반 면내 위치 측정 방법

정광석,Jung, Kwang Suk 한국교통대학교 융복합기술연구소 2012 융ㆍ복합기술연구소 논문집 Vol.2 No.1

Generally, in-plane position of moving object is measured referring to the reference pattern attached to the object. From optical camera to magnetic reluctance probe, there are many ways detecting a variation of the periodical pattern. In this paper, the various operating principles developed for in-plane positioning are reviewed and compared each other. And, a novel method measuring large rotation as well as x, y linear displacements is suggested, including a detailed description of the overall system layout. It is a modified version of the surface encoder, which is a robust digital measuring method. From the surface encoder, the rotation of an object is measured indirectly through a compensated input of optical servo and independently of linear displacements. So, the operating range can be extended simply by enlarging the reference pattern, without magnifying the decoding units.

마그네트 기반 감속기의 민감도 해석

정광석,Jung, Kwang Suk 한국교통대학교 융복합기술연구소 2014 융ㆍ복합기술연구소 논문집 Vol.4 No.2

Magnet gear transfers a high speed torque of the driving side to a low speed following side. Of course, the torque is amplified as much as a ratio between pole number of magnet gears constituting both sides through ferromagnet modulator. However, the parameters of the overall magnetic system influence the transmitting torque strongly. They include a pole number of permanent magnet, magnet thickness, reducing ratio, harmonic modulator thickness, and open ratio etc. In this paper, the influences of the parameters are analyzed using finite element method tool. By comparison, a desirable design specification is proposed, including a recommended modulator pattern.

마그네틱 기어를 이용한 2단 감속 장치

정광석(Kwang Suk Jung) 한국생산제조학회 2018 한국생산제조학회지 Vol.27 No.5

Magnetic gears exhibit torque transfer densities that are comparable to those of helical gears because all the permanent magnets arranged along the circumferential direction contribute to power transmission. However, the reduction ratio that can be realized with a single magnetic gear is not theoretically limited; however, this parameter is not effective in a single gear owing to the decrease in the magnetic strength of the permanent magnet depending on its volume. High reduction ratio can be realized by connecting multiple magnetic gears in series. This study examines the power transfer characteristics of a double reduction gear unit with two magnetic gears having a reduction ratio of 1/3.25. The theoretical modeling, frequency response characteristics, and control test results of this system implemented using hardware are described in detail.

반발식 동전기 휠을 이용한 비접촉 반송 시스템의 변수 설계

정광석(Jung, Kwang Suk) 한국산학기술학회 2016 한국산학기술학회논문지 Vol.17 No.3

도전성 평판에 부분적으로 걸쳐 회전하는 축형 동전기 휠을 구동원으로 이용하는 비접촉 반송 시스템을 제안한다.회전하는 동전기 휠에는 3축력이 발생되는데 이 중 중력방향 힘과 횡방향 힘은 자기안정성을 갖고 있으므로 공간상에서 반송 시스템의 동적 안정성을 확보하기 위해서는 길이 방향 힘만을 제어하는 것으로 충분하다. 동전기 휠은 원주 방향을 따라 주기적으로 반복되는 극성을 갖는 영구자석으로 구성되어있으므로 기본 극의 기하학적 형상이나 극수 등은 안정성 여유에 큰 영향을 미친다. 또한 휠과 전도판간의 중첩된 영역 역시 횡방향으로의 강성을 결정하는 주요 인자이므로 본 논문에서는 안정성을 성능 지표로 휠을 구성하는 주요 설계 변수에 대한 민감도 해석을 수행한다. 얻어진 설계 값을 이용하여 제작된 시스템으로 휠을 포함하는 이동 개체의 수동적인 안정성을 실험적으로 검증한다. We propose a novel contact-free transportation system in which an axial electrodynamic wheel is applied as an actuator. When the electrodynamic wheel is partially overlapped by a fixed conductive plate and rotates over it, three-axis magnetic forces are generated on the wheel. Among these forces, those in the gravitational direction and the lateral direction are inherently stable. Therefore, only the force in the longitudinal direction needs to be controlled to guarantee spatial stability of the wheel. The electrodynamic wheel consists of permanent magnets that are repeated and polarized periodically along the circumferential direction. The basic geometric configuration and the pole number of the wheel influence the stability margin of a transportation system, which would include several wheels. The overlap region between the wheel and the conductive plate is a dominant factor affecting the stiffness in the lateral direction. Therefore, sensitivity analysis for the major parameters of the wheel mechanism was performed using a finite element tool. The system was manufactured based on the obtained design values, and the passive stability of a moving object with the wheels was verified experimentally.

유도형 축방향 모터의 6축력 제어를 이용한 대회전 구현용 통합 구동기

정광석(Kwang-Suk Jung),이상헌(Sang-Heon Lee) 제어로봇시스템학회 2006 제어·로봇·시스템학회 논문지 Vol.12 No.8

비접촉 이송 시스템의 구동원으로서 동전기 휠의 응용

정광석,Jung, Kwang Suk 한국교통대학교 융복합기술연구소 2016 융ㆍ복합기술연구소 논문집 Vol.6 No.2

The rotating electrodynamic wheels can produce three-axial forces on the conductive target. The forces are linked strongly each other, and their magnitudes depend on the rotating speed of the wheel. However, the wheels can be used effectively as an actuating principle for transfer system of conductive material. The conductive material is a pipe with a constant cross-section or a conductive plate. In this paper, a few applications using the electrodynamic wheels as transferring means are introduced including the full description of the real hardware implementation.