• 제목/요약/키워드: 6-Pole

검색결과 449건 처리시간 0.025초

0.18-㎛ CMOS 공정을 이용한 6~18 GHz 8-비트 실시간 지연 회로 설계 (Design of a 6~18 GHz 8-Bit True Time Delay Using 0.18-㎛ CMOS)

  • 이상훈;나윤식;이성호;이성철;서문교
    • 한국전자파학회논문지
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    • 제28권11호
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    • pp.924-927
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    • 2017
  • 본 논문에서는 6~18 GHz 대역 8-비트 true time delay(TTD) 회로의 설계 및 측정결과에 대하여 기술하였다. 단위 지연 회로는 상대적으로 시간 지연 변화율이 일정한 m-유도 필터(m-derived filter)를 이용하였다. 설계한 8-비트 TTD는 2개의 single-pole double-throw(SPDT)와 7개의 double-pole double-throw(DPDT) 스위치로 구현하였으며, 인덕터를 이용하여 반사 특성을 개선하였다. 설계된 8-비트 TTD는 $0.18{\mu}m$ CMOS 공정을 이용하여 제작하였다. 측정된 TTD 회로의 시간 가변 범위는 250 ps이고, 시간 지연 해상도는 약 1 ps이다. 6~18 GHz의 동작 주파수에서 RMS 시간 지연 오차는 11 ps 미만이며, 입출력 반사 손실은 10 dB 이상이다. 공급 전압은 1.8 V이며, 소비 전력은 0.0 mW이다. 칩 면적은 $2.36{\times}1.04mm^2$이다.

Research on Oscillation Character of Six-Phase Fractional-Slot Concentrated-Winding Permanent Motor with Different Slot-Pole Match

  • Qiao, Ming-zhong;Zhu, Yong-xin;Liang, Jing-hui;Li, Geng
    • Journal of Electrical Engineering and Technology
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    • 제11권6호
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    • pp.1693-1699
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    • 2016
  • The oscillation character of permanent magnetic motor is highly related to its slot-pole match. By calculating air-gap magnet field and radial electromagnetic force of 6-phase fractional-slot concentrated-winding permanent magnetic motor with slot-pole match of 48/44, 48/46, 48/50 and 48/52 under no load and load status, oscillation character of permanent magnetic motor is analyzed. A 20kW prototype with 48 slots and 44 poles is designed. With many sensors attaching to the corresponding parts, oscillatory acceleration is measured, and spectrum of oscillation frequency is recorded as well. The experiment results give proof to the analysis method for permanent magnetic motor oscillation in this paper.

잡음 환경에서 짧은 발화 인식 성능 향상을 위한 선택적 극점 필터링 기반의 특징 정규화 (Selective pole filtering based feature normalization for performance improvement of short utterance recognition in noisy environments)

  • 최보경;반성민;김형순
    • 말소리와 음성과학
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    • 제9권2호
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    • pp.103-110
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    • 2017
  • The pole filtering concept has been successfully applied to cepstral feature normalization techniques for noise-robust speech recognition. In this paper, it is proposed to apply the pole filtering selectively only to the speech intervals, in order to further improve the recognition performance for short utterances in noisy environments. Experimental results on AURORA 2 task with clean-condition training show that the proposed selectively pole-filtered cepstral mean normalization (SPFCMN) and selectively pole-filtered cepstral mean and variance normalization (SPFCMVN) yield error rate reduction of 38.6% and 45.8%, respectively, compared to the baseline system.

3상 6/8극 SRM의 설계 및 운전 특성 (Design and Drive of 3-phase 6/8 SRM)

  • ;이동희;안진우
    • 전력전자학회논문지
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    • 제8권1호
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    • pp.48-55
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    • 2003
  • 본 논문은 3상 6/8극 스위치드 릴럭턴스 전동기의 설계 및 특성해석에 대해 다루었다. 고정자와 회전자 극호각의 설계 범위를 해석하고 최적값을 해석하였다. 최적의 값은 선형, 비선형으로 나누어 전통적인 설계접근 방식과 설계용 CAD를 이용하여 해석하였으며 실제 전동기를 제작하여 설계결과를 확인하였다. 이 전동기는 동일한 8/6 SRM에 비해 구동회로가 단순해지며, 권선의 전류밀도와 동손이 감소하여 효율이 상승하는 장점이 있다.

혼합 배전선로에 직격낙뢰시 전주와 케이블직선접속재가 케이블 동심중성선 전위상승에 미치는 영향 (A Study of Concentric-Neutral Line Voltage Increase Related by Pole and Cable Joint When Lightening Overvoltage Injected in Combined Distribution Line)

  • 전용주;전명수
    • 전기학회논문지
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    • 제67권6호
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    • pp.702-707
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    • 2018
  • In case of Lighting occurs in Domestic combined distribution line, normally the voltage for the neutral line increase dramatically. General connection for underground cable is bundled common earth type so the lightning over voltage increase at the concentric-neutral line is not big enough to give impact on cable sheath. But in case of Non bundled common earth type it is necessary to analyze the phenomena on cable sheath caused by lightening overvoltage. Especially pole and cable joint are the core factor to consider. In this paper concrete pole and cable joint were evaluated in case of Non bundled common earth type combined distribution Line. EMTP simulation model has been designed and several case study were made. Also several experimental test were made to verify the simulation result.

9극 10슬롯 구조의 영구자석 선형 동기 전동기의 디텐트력 저감을 위한 최적설계 (Optimal Design of a PMLSM with 9 Pole 10 Slot for Detent Force Reduction)

  • 황인성;윤희성;고창섭
    • 전기학회논문지
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    • 제57권4호
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    • pp.589-595
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    • 2008
  • Detent force of a permanent magnet linear motor(PMLSM) consist of cogging and drag forces, and should be minimized for high precision control purpose applications. This paper shows that the cogging force can be reduced effectively by employing 9 pole 10 slot structure. The drag force is minimized by optimizing the total length and shape of the exterior teeth of armature core simultaneously by using($1+{\lambda}$) evolution strategy coupled with response surface method. After optimization, the optimized PMLSM is proven to reduce 95% and 92.6% of the cogging and total detent forces, respectively, and give 12% and 6.4% higher Back-emf and thrust force, respectively, compared with a conventional 12 pole 9 slot structure under the same condition. Additionally, Simulation results by the proposed optimum design are verified by the experiment results.

A Four Pole, Double Plane, Permanent Magnet Biased Homopolar Magnetic Bearing with Fault-Tolerant Capability

  • Na, Uhn-Joo
    • 한국산업융합학회 논문집
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    • 제24권6_1호
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    • pp.659-667
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    • 2021
  • This paper develops the theory for a novel fault-tolerant, permanent magnet biased, 4-active-pole, double plane, homopolar magnetic bearing. The Lagrange Multiplier optimization with equality constraints is utilized to calculate the optimal distribution matrices for the failed bearing. If any of the 4 coils fail, the remaining three coil currents change via a novel distribution matrix such that the same opposing pole, C-core type, control fluxes as those of the un-failed bearing are produced. Magnetic flux coupling in the magnetic bearing core and the optimal current distribution helps to produce the same c-core fluxes as those of unfailed bearing even if one coil suddenly fails. Thus the magnetic forces and the load capacity of the bearing remain invariant throughout the failure event. It is shown that the control fluxes to each active pole planes are successfully isolated. A numerical example is provided to illustrate the new theory.

정밀저항시리즈 점용접에서 너깃의 대칭성에 미치는 공정변수의 영향 (The Effect of Process Parameter on the Symmetry of Nugget in Micro-resistance Series Spot Welding)

  • 조상명;김송미
    • Journal of Welding and Joining
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    • 제19권6호
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    • pp.622-629
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    • 2001
  • The aim of this experiment is to establish the method that obtains symmetrically two nuggets in microresistance series spot welding. The sheets of austenite stainless steel STS304 applied to various electronic parts were experimented by the inverter welding power source of polarity controllable type and by the twin head for left and right electrode force to be controlled separately. The experimental results were obtained as follows : 1) When series spot welding was carried out by DC 1 pulse as welding current with same electrode force at left and right, the asymmetry of nuggets was resulted from the larger nugget of the (-) pole because of the Peltier effect. The dynamic resistance of weld spot at left and right was appeared differently according to the growth of nuggets. 2) When AC 1 cycle by welding power source of polarity controllable type was applied, the nuggets were almost symmetrically formed. 3) In a twin head, if the electrode force of (-) pole was larger than that of (+) pole, the diameters of two nuggets became to same. It was confirmed that the dynamic resistance of (-) pole was decreased to the same level as it of (+) pole. 4) Although the forces of left and right electrode were same, and only DC 1 pulse was applied, symmetric nuggets were obtained if the conductivity of (+) pole was lower than it of (-) pole.

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Application of Inverse Pole Figure to Rietveld Refinement: II. Rietveld Refinement of Tungsten Liner using Neutron Diffraction Data

  • Kim, Yong-Il;Lee, Jeong-Soo;Jung, Maeng-Joon;Kim, Kwang-Ho
    • The Korean Journal of Ceramics
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    • 제6권3호
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    • pp.240-244
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    • 2000
  • The three-dimensional orientation distribution function of a conical shaped tungsten liner prepared by the thermo-mechanical forming process was analyzed by 1.525$\AA$ neutrons to carry out the Rietveld refinement. The pole figure data of three reflections, (110)(220) and (211) were measured. The orientation distribution functions for the normal and radial directions were calculated by the WIMV method. The inverse pole figures of the normal and radial directions were obtained from their orientation distribution functions. The Rietveld refinement was performed with the RIETAN program that was slightly modified for the description of preferred orientation effect. We could successfully do the Rietveld refinement of the strongly textured tungsten liner by applying the pole density of each reflection obtained from the inverse pole figure to the calculated diffraction pattern. The correction method of preferred orientation effect based on the inverse pole figures showed a good improvement over the semi-empirical texture correction based on the direct usage of simple empirical functions.

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2011 대구 세계육상선수권대회 남자 장대높이뛰기경기 기술의 운동학적 분석 (Kinematic Analyses of Men's Pole Vault in IAAF World Championships, Daegu 2011)

  • 최규정;이경옥;김남희;강지은;김혜림
    • 한국운동역학회지
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    • 제21권5호
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    • pp.551-560
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    • 2011
  • The purpose of this study was to perform the kinematic analyses of the men's pole vault skills in IAAF World Championships Daegu 2011. Subjects were the 1st through 8th place finishers in the pole vault. The kinematic analyses were divided into four phases: two dimensional run up analysis, and three dimensional analyses for the remaining plant, swing up, and extension phases. Run-up variables consisted of run up distance, number of steps, average step length, the ratio of step length to his height, average velocity at the final 6~11 m, approach position. Three variables were analyzed during plant: pole angle, center of gravity (COG) velocity, and takeoff angle of COG. Swing up phase variables included: pole flexion angle, COG velocity (horizontal, vertical, resultant), COG trajectory and bar approach angle of COG. Compared to the 2009 World Championships in Berlin, the average vault height, run up velocity and approach position increased. However, horizontal velocity during the last two steps of the final approach decreased dramatically compared to speeds from 1990. These results reflect the change in both technique and improved physical fitness in pole vaulters. During extension, the peak height of COG averaged 0.3m higher then COG height when the pole was released. These specific results can help coaches and athletes modify training and improve performance.