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자기부상방식 AMD 를 이용한 모바일 하버용 횡동요 저감 데모 장비의 개발
박철훈(Cheol Hoon Park),함상용(Sang Yong Ham),김병인(Byung In Kim),이성휘(Sung Whee Lee),박희창(Hee Chang Park),조한욱(Han Wook Cho),문석준(Seok Jun Moon),정태영(Tae Young Chung) Korean Society for Precision Engineering 2011 한국정밀공학회지 Vol.28 No.1
Mobile harbor which is a novel concept of ocean transportation to bring the containers from the cargo ship waiting on the ocean away is being focused now. To provide the mobile harbor with the stable loading/unloading condition, it is necessary to develop the oscillation mitigation technologies such as anti-rolling system. Anti-rolling system using AMD(Active Mass Driving) has merits that it can handle the disturbances more actively and mitigate the rolling oscillation faster than other type anti-rolling system. However, rack-and-pinion type AMD has problems such as big friction noise from gears and motor, wear and tear, and continuous maintenance. In this paper, novel anti-rolling system using Maglev type AMD for mobile harbor is suggested in order to resolve the problems caused by the friction. This novel anti-rolling system doesn’t make any friction because it supports the moving mass by using magnetic levitation force and moves it by using propulsion force from the linear motor. The demo system of the novel anti-rolling system using maglev type AMD has been developed in order to investigate its feasibility. This paper presents the procedures and results of development of this demo system.
하이브리드형 자기베어링을 이용한 터보냉매압축기 쓰러스트 베어링 설계
박철훈(Cheol Hoon Park),최상규(Sang Kyu Choi),박준영(Jun Young Park) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
21,000RPM, l45RT class turbo refrigerant compressor which is supported by magnetic bearings are under development. Oil-free bearing has merits that the continuous operation is possible because the lubrication system is not required and the refrigerant is not contaminated bye the oil. This paper presents the design procedure of thrust hybrid magnetic bearing (HMB) for turbo refrigerant compressor. Thrust HMB consists of permanent magnet and electromagnet and it is designed to support 2,000N thrust force by compressor at 21,000rpm operating speed. The simulation results which shows that thrust HMB would generate the designed magnetic force are presented.
코깅토크 측정장치 직접구동용 영구자석 동기전동기의 정밀속도 제어
박철훈(Cheol Hoon Park),손영수(Young Su Son),함상용(Sang Yong Ham),김병인(Byung In Kim),윤동원(Dong Won Yun) Korean Society for Precision Engineering 2009 한국정밀공학회지 Vol.26 No.5
Recently PMSM(Permanent magnet synchronous motor) are used for the various direct drive applications such as index table, telescope system and so on. Because the position/speed control performance of direct drive PMSM is directly affected by the torque ripple, there are lots of studies to reduce the cogging torque in the motor design stage. In order to verify the motor design, the reliable cogging torque measurement system is essentially required. The measured motor must be rotated in the constant speed under 1deg/sec so that the cogging torque profile is measured correctly. In this study, the cogging torque measurement system which uses the direct drive PMSM and the speed controller to rotate the measured motor in 0.1rpm(0.6deg/sec) has been developed. Simulink/xPC target was used for the controller and data acquisition system. Based on PI controller, DOB and AFC have been applied to eliminate the low frequency disturbances and the periodic speed ripple. The experimental results show the good performance of the speed regulation for the reference speed 0.1rpm and the reliable profile of the measured cogging torque by the developed speed controller.
박철훈 ( Cheol-hoon Park ),조용진 ( Yong-jin Cho ),신승혁 ( Seung-hyuk Shin ),정소리 ( So-ri Jeong ),조수현 ( Soo-hyun Cho ),허동우 ( Dong-woo Heo ) 한국정보처리학회 2017 한국정보처리학회 학술대회논문집 Vol.24 No.2
본 연구는 일상에서 길을 찾는 데 어려움을 겪은 보행자나 초행길이 낯선 여행자들을 대상으로, 스마트폰과 더불어 사람들이 많이 지니고 다니는 가방을 가지고 적용하였다. 스마트폰의 LBS, 블루투스 기능과 가방에 부착된 진동 인터페이스가 연결되어 실시간 경로 안내를 받을 수 있는 제품이다. 부가적인 기능으로는 업 상에 회원관리 기능이 있어 개인의 이용 기록에 관한 데이터가 DB에 저장되며 DBMS를 통한 데이터 분석으로 사용자에게 맞춤화된 서비스를 제공해 줄 수 있다. 또한 여러 사용자들이 이용한 플랫폼에 쌓인 데이터를 가지고 새로운 비즈니스를 창출할 수도 있다. 추가적으로 일정 거리 이상 멀어지면 신호의 강도가 약해지는 블루투스의 특성을 이용하여 이용자가 가방과 일정 거리 이상 떨어질 경우, 스마트폰으로 팝업 창을 띄워주는 형태로 분실 방지 기능을 제공해 줄 수도 있다.