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영구자석 형상비를 고려한 영구자석 매입형 BLDC 전동기 설계 및 특성해석
尹勤榮(Keun-Young Yun),柳世鉉(Se-Hyun Rhyu),梁炳烈(Byoung-Yull Yang),權炳一(Byung-Il Kwon) 대한전기학회 2006 전기학회논문지 B Vol.55 No.1
Nowaday, owing to high efficiency and easy speed control of brushless DC(BLDC) motor, the demand of BLDC motor that has high power and low noises are increasing. Especially demand of interior permanent magnet(IPM) BLDC with high efficiency and high power in electric motion vehicle is increasing. IPM BLDC motor has permanent magnets in the rotor. Because it has two different flux paths, magnetic reluctance differences are generated in d-axis and q-axis. As the result of the inductance differences that are generated by the saliency(magnetic reluctance differences) in the rotor, the motor has structural advantage that has the additional reluctance torque except a magnet torque and because magnet is situated inside the rotor, the mechanical structure is strong. Therefore IPM BLDC motor makes possible to have high speed and high power. This paper presents a design and characteristics analysis of IPM BLDC motor for electric vehicle. To design IPM BLDC motor, surface mounted permanent magnet(SPM) BLDC motor is used as the initial design model. According to the shape-ratio() of permanent magnet, the characteristic of IPM BLDC motor is analyzed by Finite element method (FEM). Characteristics analysis results of the designed motor are compared with the experimental results.
회전자 자속장벽 설계에 의한 영구자석 매입형 BLDC 전동기 코깅 토오크 저감 연구
尹勤榮(Keun-Young Yun),梁炳烈(Byoung-Yull Yang),權炳一(Byung-Il Kwon) 대한전기학회 2006 전기학회논문지 B Vol.55 No.10
For high efficiency and easy speed control of brushless DC (BLDC) motor, the demand of BLDC motor is increasing. Especially demand of interior permanent magnet (IPM) BLDC with high efficiency and high power in electric motion vehicle is increasing. However, IPM BLDC basically has a high cogging torque that results from the interaction of permanent magnet magnetomotive force (MMF) harmonics and air-gap permeance harmonics due to slotting. This cogging torque generates vibration and acoustic noises during the driving of motor. Thus reduction of the cogging torque has to be considered in IPM BLDC motor design by analytical methods. This paper proposes the cogging torque reduction method for IPM BLDC motor. For reduction of cogging torque of IPM BLDC motor, this paper describes new technique of the flux barriers design. The proposed method uses sinusoidal form of flux density to reduce the cogging torque. To make the sinusoidal air-gap flux density, flux barriers are applied in the rotor and flux barriers that installed in the rotor produce the sinusoidal form of flux density. Changing the number of flux barrier, the cogging torque is analyzed by finite element method. Also characteristics of designed model by the proposed method are analyzed by finite element method.
약물검사에서 관리시료의 농축을 이용한 보고 가능 범위의 설정에 대한 연구
장상우 ( Sang Wu Chang ),김남용 ( Nam Yong Kim ),최호성 ( Ho Sung Choi ),박용원 ( Yong Won Park ),윤근영 ( Keun Young Yun ) 대한임상검사과학회 2004 대한임상검사과학회지(KJCLS) Vol.36 No.1
This study was designed to establish working range for reoportable range in own laboratory in order to cover the upper and lower limits of the range in test method. We experimented ten times during 10 days for setting of reportable range with between run for method evaluation. It is generally assumed that the analytical method produces a linear response and that the test results between those upper and lower limits are then reportable. CLIA recommends that laboratories verify the reportable range of all moderate and high complexity tests. The Clinical Laboratory Improvement Amendments(CLIA) and Laboratory Accreditation Program of the Korean Society for Laboratory Medicine states reportable range is only required for "modified" moderately complex tests. Linearity requirements have been eliminated from the CLIA regulations and from others accreditation agencies, many inspectors continue to feel that linearity studies are a part of good lab practice and should be encouraged. It is important to assess the useful reportable range of a laboratory method, i.e., the lowest and highest test results that are reliable and can be reported. Manufacturers make claims for the reportable range of their methods by stating the upper and lower limits of the range. Instrument manufacturers state an operating range and a reportable range. The commercial linearity material can be used to verify this range, if it adequately covers the stated linear interval. CLIA requirements for quality control, must demonstrate that, prior to reporting patient test results, it can obtain the performance specifications for accuracy, precision, and reportable range of patient test results, comparable to those established by the manufacturer. If applicable, the laboratory must also verify the reportable range of patient test results. The reportable range of patient test results is the range of test result values over which the laboratory can establish or verify the accuracy of the instrument, kit or test system measurement response.
검량보정 검증의 실험적 적합성에 대한 연구 -치료적 약물검사를 중심으로-
장상우 ( Sang Wu Chang ),김남용 ( Nam Yong Kim ),최호성 ( Ho Sung Choi ),박용원 ( Yong Won Park ),추경복 ( Gyung Bok Chu ),윤근영 ( Keun Young Yun ),박병옥 ( Byung Ok Park ) 대한임상검사과학회 2005 대한임상검사과학회지(KJCLS) Vol.37 No.1
The purpose of this study was to verify (i) a consistent calibration verification for the assessment of method linearity and (ii) calibration agreement with calibration settings. We validated calibration verification through method linearity with different lot number of individual calibrators that span the working range for 9 tests except salicylate with control sample in test. We evaluated that it covered broad analyte range to assay from near zero to the top of the measuring range with 5 or 6 points every three times for 10 analytes in TDM test. Target values were plotted on X-axis with assigned or observed values on the Y-axis. Working range were as follows. Calibration verification of the measuring range (maximum to minimum values) has been validated asetaminophen 0.1 to 304.6 μg/mL, salicylate 0 to 1005 μg/mL, valproic acid 3.2 to 154.19 μ g/mL, digoxin 0.17 to 5.65 ng/mL, vancomycine 1.3 to 80.51 μg/mL, carbarmazepine 0.1 to 22.3 μg/mL, phenytonin 0.6 to 40.21 μg/mL, theophyline 0.2 to 40.21 μg/mL, primidone 0 to 24.07 μg/mL, phenobarbital 0.6 to 60.0 μg/mL. Drawing a straight line through five or six points of these data showed good linearity. We are sure that it is important to assess the calibration verification of a test method to ascertain the lowest and highest test results that are reliable.