• Title/Summary/Keyword: Precision Machinery

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Design and Fabrication of a Brushless DC Motor with 3mm Outer Diameter (외경 3mm급 브러시레스 DC 모터의 설계 및 제작에 관한 연구)

  • Jung In-Soung;Kim Joo-Han;Choi Jun-Hyuk;Hur Jin;Sung Ha-Gyeong
    • Proceedings of the KIEE Conference
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    • summer
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    • pp.755-757
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    • 2004

  • A design and fabrication result of a ultra-small brushless DC motor is presented. The outer diameter of the motor is 3mm. This motor is designed to 3 phase coreless winding, and operated with synchronous type driver. The experimental results for back EMF value, static torque and speed characteristics are presented and discussed.

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Influence of Parameter Setting in an Oil Cooler on the Temperature Characteristics of an Ultra-precision Hydrostatic Table (초정밀 유정압 테이블에서 냉각장치의 변수 설정이 온도특성에 미치는 영향)

  • Khim, Gyungho;Kim, Chang Ju;Oh, Jeong Seok;Park, Chun Hong
    • Journal of the Korean Society for Precision Engineering
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    • v.32 no.6
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    • pp.571-576
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    • 2015

  • Temperature characteristics of supply oil in an ultra-precision hydrostatic table are largely influenced by parameter setting in an oil cooler such as the location of reference sensor and cooling temperature. In this paper, influences of the parameter setting on the temperature variation in the hydrostatic table are experimentally analyzed to suggest the guidelines for practical application. In case of using temperature of inlet oil as a reference sensor in the oil cooler, temperature rise of the supply oil is smaller and thermal settling time is faster than that of using temperature of outlet oil as a reference sensor. The experimental results also show that temperatures of table, rail and return oil can be made almost same, and thermal settling time can be decreased by setting cooling temperature in the oil cooler to be lower than atmospheric temperature.

  • https://doi.org/10.7736/KSPE.2015.32.6.571 인용 PDF KSCI

Practical application of picosecond laser micro-machining to the direct fabrication of a diffraction grating mold (피코초 레이저를 이용한 회절 격자 금형 개발)

  • Noh Ji-Whan;Lee Jae-Hoon;Sohn Hyon-Kee;Suh Jeong;Shin Dong-Sig
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.487-488
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    • 2006

  • Picosecond (ps) laser micro-machining has emerged as an attractive method of fabricating high-precision microstructures, especially in metals. In this paper, a metallic mold for diffraction gratings is fabricated with a mode-locked 12 Ps $Nd:YVO_4$ laser. Laser pulses with a wavelength of 355nm are irradiated on the surface of NOK 80, a mold material, to generate line patterns. In order to minimize the line width, laser power is set just above the ablation threshold of NOK 80. Results show that the spectrum from the fabricated mold is good enough for some industrial application.

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