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트러스트 요크를 이용한 HDD용 스핀들모터의 베어링 설계
김상욱(Sanguk Kim),김용진(Yongjin Kim),김진환(Jinhwan Kim),이용근(Yonggeun Kim),김영봉(Youngbong Kim) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11
This paper is presented for the design of the thrust yoke for the spindle motors. HDD spindle motors are rotated by fluid dynamic bearing which consists of the shaft and the sleeve with the groove to generate the pressure. Because the thrust and journal clearances between shaft and sleeve is too small, around Bum and 2.5um, respectively, it is very difficult to design the bearing to come up to the disks to read and write the data. By the way, it is also so hard to overcome the load of the disks with only the thrust bearing. So, the paper is proposed for the trust yoke to come up to the disks considering of the force of the thrust bearing. In this paper, we proposed the thrust yoke with an unique fluid dynamic bearing in comparison with the motors without thrust yoke. Experimental results show the performance of the thrust yoke of the spindle motors for an HDD.
김상욱(Sanguk Kim),김진환(Jinhwan Kim),이용근(Yonggeun Kim),김보열(Boyoul Kim),김영봉(Youngbong Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
This paper is presented for the measurement of the bearing stiffness for the spindle motors. BLDC Spindle Motors for the Hard Disk Drive are used by several kinds of the bearings, such as ball bearing, fluid dynamic bearing, and aero dynamic bearing. The spindle motors are attached the platters to read and write the data. Because the platter rotates at high end speed with the load and can be shocked from a suddenly moving, the bearing needs the rated stiffness with the pressure. By the way, it has not been realized to measure the real stiffness for each bearing types. In this paper, we proposed the method of measuring the stiffness for the bearings by using the magnet force. Experimental results show the performance to measure the bearing stiffness of the BLDC spindle motors for an HDD.
Hybrid mode-locked Er-doped fiber femtosecond oscillator with 156 mW output power.
Kim, Seungman,Kim, Yunseok,Park, Jiyong,Han, Seunghwoi,Park, Sanguk,Kim, Young-Jin,Kim, Seung-Woo Optical Society of America 2012 Optics express Vol.20 No.14
<P>We report on an Er-doped fiber oscillator that produces 146 fs pulses with 156 mW average power at a repetition rate of 49.9 MHz. The pulse energy reaches 3.13 nJ, surpassing the conventional power limit in the dispersion-managed soliton regime. Such high pulse power is obtained by devising a hybrid mode-locking scheme that combines saturable absorption with nonlinear polarization evolution. The oscillator also offers excellent temporal purity in the generated pulses with high power, providing a robust fiber-based frequency comb well suited for industrial uses.</P>
Kim, Jung Kuk,Kwon, Ohman,Kim, Jinho,Kim, Eung-Kyun,Park, Hye Kyung,Lee, Ji Eun,Kim, Kyung Lock,Choi, Jung Woong,Lim, Seyoung,Seok, Heon,Lee-Kwon, Whaseon,Choi, Jang Hyun,Kang, Byoung Heon,Kim, Sanguk American Society for Biochemistry and Molecular Bi 2012 The Journal of biological chemistry Vol.287 No.25