• Title/Summary/Keyword: Flat-topped current

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Online Switching Angle Control for Performance Optimization of the SRM (최적의 스위칭각제어를 통한 SRM의 성능최적화에 관한 연구)

  • Jeong, B.H.;Choi, Y.O.;Cho, G.B.;Baek, H.L.;Lee, S.G.;Choi, M.H.
    • Proceedings of the KIEE Conference
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    • 2006.07b
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    • pp.1061-1062
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    • 2006
  • This paper represent improved On-line Turn off, commutation Angle control schemes for switched reluctance motors based on current control. For the purpose of the finding optimal commutation switching angle point, it is utilized turn on and turn off position calculation with inductance vs. current vs. flux linkage analysis method. The goal of proposed paper is the maximization of the energy conversion per stroke and maximizing efficiency and obtaining approximately flat-topped current waveform. The proposed control scheme is demonstrated on a simulation experimental result.

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Design of 65kW Class SRM for HEV (65kW급 HEV용 SRM의 설계)

  • Kim, Tae-Hyoung;Ahn, Jin-Woo;An, Young-Joo;Moon, Jae-Won
    • Proceedings of the KIPE Conference
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    • 2005.07a
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    • pp.562-564
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    • 2005
  • This paper presents the reasonable design parameters of a SRM for hybrid electric vehicle driving. For the design of SRM, the initial model is designed using the equivalent magnetic circuit method. In order to optimize the SRM for HEV. The initial model is redesigned by FEM with the variation of the stock length and turns of winding. This paper shows that a flat-topped current of a phase can be made from a change of the stack length and the number of turns for high efficiency, high average torque and a lower torque ripple. The change of current falling time as a variation of turn-off angle was shown by FEA. The iron loss and copper loss were described. The torque of the redesigned motor is suitable for low and high speed ranges to drive a HEV that was verified by the speed-torque curve.

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Design and Drive Characteristics of SRM for HEV (HEV용 SRM의 설계 및 구동특성)

  • Kim, Tae-Hyoung;Ahn, Jin-Woo;An, Young-Joo;Moon, Jae-Won
    • Proceedings of the KIEE Conference
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    • 2005.07b
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    • pp.1141-1143
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    • 2005
  • This paper presents the reasonable design parameters of a SRM for hybrid electric vehicle driving. For the design of SRM, the initial model is designed using the equivalent magnetic circuit method. In order to optimize the SRM for HEV. The initial model is redesigned by FEM with the variation of the stock length and turns of winding. This paper shows that a flat-topped current of a phase can be made from a change of the stack length and the number of turns for high efficiency, high average torque and a lower torque ripple. The change of current falling time as a variation of turn-off angle was shown by FEA. The iron loss and copper loss were described. The torque of the redesigned motor is suitable for low and high speed ranges to drive a HEV that was verified by the speed-torque curve.

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Partial Spectrum Detection and Super-Gaussian Window Function for Ultrahigh-resolution Spectral-domain Optical Coherence Tomography with a Linear-k Spectrometer

  • Hyun-Ji, Lee;Sang-Won, Lee
    • Current Optics and Photonics
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    • v.7 no.1
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    • pp.73-82
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    • 2023
  • In this study, we demonstrate ultrahigh-resolution spectral-domain optical coherence tomography with a 200-kHz line rate using a superluminescent diode with a -3-dB bandwidth of 100 nm at 849 nm. To increase the line rate, a subset of the total number of camera pixels is used. In addition, a partial-spectrum detection method is used to obtain OCT images within an imaging depth of 2.1 mm while maintaining ultrahigh axial resolution. The partially detected spectrum has a flat-topped intensity profile, and side lobes occur after fast Fourier transformation. Consequently, we propose and apply the super-Gaussian window function as a new window function, to reduce the side lobes and obtain a result that is close to that of the axial-resolution condition with no window function applied. Upon application of the super-Gaussian window function, the result is close to the ultrahigh axial resolution of 4.2 ㎛ in air, corresponding to 3.1 ㎛ in tissue (n = 1.35).

Online Turn-Off Angle Contro1 for Performance Optimization of the Switched Reluctance Motor (온라인 턴 오프각제어를 통한 SRM의 성능최적화)

  • Jeong, Byeong-Ho;Choi, Youn-Ok;Lee, Kang-Yeon;Cho, Geum-Bae;Chung, Soo-Bok
    • The Transactions of the Korean Institute of Power Electronics
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    • v.12 no.1
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    • pp.98-106
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    • 2007
  • This paper represent improved on-line turn off angle control schemes for switched reluctance motors based on current control. For the purpose of finding the optimal commutation switching angle point with improved controller, it is utilized turn on and turn off position calculation with inductance vs. current vs. not linkage analysis method. The goal of proposed paper is the maximization of the energy conversion per stroke and torque ripple reduction and obtaining approximately flat-topped current waveform. The proposed control scheme is demonstrated simulation and on a prototype experimental system.

Geophysical and Sedimentological Characteristics of Lomilik Seamount, West Pacific (서태평양 Lomilik 해저산 퇴적환경 특성)

  • Lee, Hyun-Bok;Oh, Jae-Kyung;Park, Cheong-Kee;Chi, Sang-Bum;Kim, Jong-Uk;Moon, Jai-Woon;Nam, Sang-Heon
    • Ocean and Polar Research
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    • v.26 no.2
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    • pp.207-218
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    • 2004
  • Lomilik Seamount in the west Pacific was seismically surveyed and photographed to illuminate the bottom topography, the condition of manganese crust, and the characteristics of sedimentary environment. Lomilik Seamount has a NW-SE elongated bottom topography with steep slopes in the NESW direction part. Even though the steep slopes of the seamount are devoid of deposits, the summit area and gentle slope of the seamount are covered with thick deposits. The seismic data indicate that Lomilik Seamount is a flat-topped and step-faulted guyot of volcanic origin. Deep-sea camera photographs show that much of the seafloor is rippled in symmetrical and asymmetrical patterns. The traces of biological activity were distinct on gentle seafloor suggesting the low-energy bottom conditions. Some photographs also show outcrops encrusted with manganese crusts. Sedimentary environments in the Lomilik Seamount appear have been governed by regional morphology and strong bottom current.