• Title/Summary/Keyword: Tooth Shape

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Analysis of the Reduction of Detent Force in a Permanent Magnet Linear Synchronous Motor (영구자석형 선형 동기전동기의 디텐트력 저감방식에 관한 특성해석 및 상호 비교)

  • Jang, S.M.;Yoon, I.K.;Lee, S.H.;Lee, J.H.
    • Proceedings of the KIEE Conference
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    • 2000.07b
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    • pp.757-759
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    • 2000
  • The problem in improving the positioning precision of a permanent magnet linear synchronous motor(PMLSM) is the large detent force caused by the permanent magnet. The detent force is thought to arise from the difference of the position of a permanent magnet end and a tooth position. In this paper, Three methods of reducing detent force is presented The first method is adjusting the width of permanent magnet. The second method is varying the shape of armature teeth. The third method is the arrangement of the permanent magnet end. This paper compares with the ratio of reducing the detent force according to the three methods.

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Characteristic Analysis of LPM for Proportional Control Valve (비례제어 밸브용 LPM의 특성 해석)

  • Kim, Sung-Heon;Lee, Eun-Woong;Lee, Dong-Ju;Kim, Sung-Jong;Kim, Ok-Whan
    • Proceedings of the KIEE Conference
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    • 2000.07b
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    • pp.891-893
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    • 2000
  • Because of linear operation by direct drive and compact system, and the free accumulation of position error, LPM is suitable for proportional control valves actuator. In this study, to develop electromagnetic proportional valves actuator we designed tooth shape of double sides LPM and suggested the driving principle based upon the excitation method, It's the magnetic structure is so complex by the cubic effect configuration that finite element analysis is required. By the 3D finite element analysis, we got the magnetic distribution of LPM and analyzed static thrust force characteristics. By this analyzation, we obtained basic data required for the practical use of driving system for the proportional control valves. Thus, considering electrical and mechanical constants we could design and manufacture double sides LPM for the proportional control valves.

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Analysis of Characteristic In Axial Flux Motor Considering the Laminated Stack Directions (적층 방향을 고려한 축방향 자속형 전동기의 특성 해석)

  • Lee, Byung-Jun;Cho, Won-Yong;Kim, Byong-Kuk;Won, Jin-Kuk;Cho, Yun-Hyun;Chun, Yon-Do;Koo, Dae-Hyun
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.1069-1070
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    • 2007
  • In this paper, a new stator shape for axial flux motor was proposed. It consists of tooth and back-yoke laminated and be assembled with each other. The method assembling together has a significant characteristic. It is different direction of lamination between core and back-yoke. This paper shows analysis method considering the lamination direction and analyze characteristic of axial flux motor with stator proposed using 3D finite element method.

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The Static thrust force characteristics for 2 phase 8 poles HB type Linear Pulse Moto (2상8극 HB형 리니어 펄스 모터의 정추력 해석)

  • Kim, Sung-Hun;Lee, Eun-Woong;Lee, Dong-Ju;Lim, Su-Saeng;Oh, Young-Woong
    • Proceedings of the KIEE Conference
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    • 1998.11a
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    • pp.3-6
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    • 1998
  • In this paper, we evaluated the effect the tooth shape influenced against the thrust force which then was confirmed by experimentation. We analyzed the effect of by measuring static thrust force of the Phases of A and B. With this result, we found that there is an area where the thrust force abruptly decreases because the variance of the airgap permeance is very small following the positions of the stator and the mover. And the unbalance among phases showed almost equal, which means that static thrust force of the phases of A and B is very small because magnetic path of the 2-phase 8-pole HB-type is almost equal.

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A Study of the Broach Tool Shape for Improving Concentricity of a T/F Driven Gear (T/F Driven Gear 동심도 향상을 위한 브로치 형상에 관한 연구)

  • Park, S.J.;Kim, D.H.
    • Transactions of Materials Processing
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    • v.23 no.5
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    • pp.275-281
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    • 2014
  • Broaching is widely used for the machining of inner shaped slots in work-pieces. The broach tool is moved vertically (usually by hydraulic power) through the work-piece. Broaching occurs with the work-pieced fix while the broach tool traverses through material and shears it. To produce a T/F driven gear both an outside cutting and an inside cutting are needed. The outside cut determines the tooth profile and the inside cut determines the inner dimension. Broaching can cause problems with concentricity. In the current study, the characteristics of shearing along the cutting blade and the broaching of a T/F driven gear are considered.

A Comparison of Active Contour Algorithms in Computer-aided Detection System for Dental Cavity using X-ray Image (X선 영상 기반 치아와동 컴퓨터 보조검출 시스템에서의 동적윤곽 알고리즘 비교)

  • Kim, Dae-han;Heo, Chang-hoe;Cho, Hyun-chong
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.12
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    • pp.1678-1684
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    • 2018
  • Dental caries is one of the most popular oral disease. The aim of automatic dental cavity detection system is helping dentist to make accurate diagnosis. It is very important to separate cavity from the teeth in the detection system. In this paper, We compared two active contour algorithms, Snake and DRLSE(Distance Regularized Level Set Evolution). To improve performance, image is selected ROI(region of interest), then applied bilateral filter, Canny edge. In order to evaluate the algorithms, we applied to 7 tooth phantoms from incisor to molar. Each teeth contains two cavities of different shape. As a result, Snake is faster than DRLSE, but Snake has limitation to compute topology of objects. DRLSE is slower but those of performance is better.

Easy, Efficient Class II composite resin restoration technique (쉽고 효율적인 클래스 II 복합레진수복테크닉)

  • Lee, Changhoon
    • Journal of the Korean Academy of Esthetic Dentistry
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    • v.27 no.2
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    • pp.66-74
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    • 2018
  • Composite resin restoration on class II cavities is a challenging procedure since it is tough to replicate proper contact, the natural shape of the tooth, etc. Moreover, it is not familiar with the procedure and tools for this specific situation, neither. Nowadays the patients, however, request more and more composite restorations which are relatively quick and more esthetic. In this case report, the class II composite resin restoration procedure is illustrated step by step. Every step must be considered its final consequence thoroughly. In this approach, we can minimize the finishing procedure and save our effort and time.

A Report of Carcinus aestuarii (Decapoda: Brachyura: Carcinidae) from Korea

  • Lee, Sang-kyu;Lee, Sang-Hui;Kim, Hyun Kyong;Song, Sung Joon
    • Animal Systematics, Evolution and Diversity
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    • v.36 no.4
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    • pp.420-423
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    • 2020
  • As a result of continuous taxonomic studies on the Korean crabs, Carcinus aestuarii Nardo, 1847 belonging to the superfamily Portunoidea is newly reported from Korean waters. Carcinus aestuarii has characteristics as followings: cardiac, hepartic and brachial regions are divided by deep furrow; shape of three lobes in frontal area is flatter with hairy; inside of carpus is with one sharp tooth; the posterior-lateral margin of the carapace is concave, and so on. The examined specimen doesn't have hairy and bump on outer margin of the chelipeds which differed from the previous description of the specimens collected from Tokyo Bay, Japan. Here, the diagnosis and the picture of Korean specimen is provided. Korean portunoids currently consist of 20 species belonging to 10 genera.

Analysis of Bending and Rotation Phenomenon of Torsion Bar During Press-fitting Process for EPS Angle Sensors (EPS 각도센서용 토션 바의 압입공정의 휨과 회전현상 분석)

  • H. Lee;S.H. Lee;T.H. Jeon;I.-K. Chung
    • Transactions of Materials Processing
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    • v.32 no.6
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    • pp.376-383
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    • 2023
  • The torsion bar, which is a steering torque sensor, is mounted between the steering pinion and the input shaft in the IPA(input pinion assembly). Accurate torque measurement is important to improve the sense of operation, and the straightness of the torsion bar can affect torque measurement. In this study, the amount of bending was measured and the exact shape was analyzed regarding the bending phenomenon in the press-fitting process for torsion bars. The effect of alignment error was analyzed through finite element forming analysis. Process data analysis was conducted for the double-end press fit model. If there is an alignment error of about 10% of the serration tooth height, the indentation load is reduced by about 10%. If there is an alignment error, the torsion bar is rotated.

Evaluation of imaging reformation for root and pulp canal shapes of permanent teeth using a cone beam computed tomography (Cone beam형 전산화단층영상을 이용한 영구치 치근과 근관의 형태 평가)

  • Hong, Jong-Hyun;Kim, Gyu-Tae;Choi, Yong-Suk;Hwang, Eui-Hwan
    • Imaging Science in Dentistry
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    • v.37 no.3
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    • pp.165-170
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    • 2007
  • Purpose: To estimate the shape of root and pulp canal using a dental cone beam computed tomography (CBCT) and to evaluate the accuracy of imaging reformation. Materials and Methods: CBCT images were obtained with incisors, premolars, and molars as the destination by using PSR $9000N^{TM}$ Dental CT system (Asahi Roentgen Ind. Co., Ltd, Kyoto, Japan) and i-CAT (Imaging Sciences International, Inc, USA) cone beam CT unit that have different kind of detector and field of view, and compared these with the shape and the size of actual root and root canal. Results: When the measuring value of cone beam computed tomography concerning to each root's bucco-lingual diameter and mesio-distal diameter was compared with the value of the actual root, it reveals an error range $-0.49{\sim}+0.63$ mm at PSR900N and $-0.97{\sim}+1.14$ mm at i-CAT (P>0.05). It was possible to identify and measure PSR$9000N^{TM}$ Dental CT system to the limit $0.48{\pm}0.06mm$ (P>0.05) and i-CAT CBCT to the limit $0.86{\pm}0.09mm$ (P<0.05) on estimating the size and the shape of root canal. Two kinds of CBCT images revealed the useful reproducibility to estimate the shape of root, but there was the difference to estimate the shape of root according to apparatus. The reproducibility of root shape in the image of three-dimensions at PSR 900N is low such as 0.65 mm in a case of minute root canal. Conclusions: CBCT images revealed higher accuracy of the imaging reformation for root and pulp and clinically CBCT is a useful diagnostic tool for the assessment of root and canal. However, there are different qualities of imaging reformation according to CBCT apparatus and limitation of reproducibility for minute root canals.

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