• Proceedings of the Korean Nuclear Society Conference
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• 1999.10a
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• pp.97.1-97
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• 1999

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.23 no.8
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• pp.67-73
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• 2009

The magnetic saliency effect in surface-mounted permanent-magnet (SMPM) motors on the torque control at high speeds is first presented and analyzed in this paper. The d- and q- axes impedance are measured by proposed State-Filter. Measurement of the d- and q- axes impedance difference is performed to prove the existence of the magnetic saliency. Then, the saliency effects on the torque control performance in the flux weakening region are discussed. Based on the developed motor modeling with the reluctance torque, the proposed control adjusts the d- and q-axis current toward the operating point to track the commanded torque. The feasibility of the presented idea is verified by experimental results on a commercial 600[W] SMPM motor.

• Proceedings of the Korean Magnestics Society Conference
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• 1992.03a
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• pp.34-35
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• 1992

• Proceedings of the KIPE Conference
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• 2010.07a
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• pp.446-447
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• 2010

본 논문에서는 전동기의 고정자 권선 절연파괴 고장을 분석하고 자기 인덕턴스 변화의 비선형성을 고려하기 위해 FEM 시뮬레이션을 이용하여 고장 현상을 해석하고, 실험을 통해 검증하였다. 제안한 고장의 모델링을 통하여 고정자 권선에서 단락이 발생하면 단락된 권선의 순환전류에 의해 고정자에 자기 포화현상이 발생하고, 입력전류의 불평형에 의하여 평균토크가 감소하고, 토크리플이 증가함을 확인 하였다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.36 no.7
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• pp.651-657
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• 2008

A new approach for maximizing torque capability of low efficient reaction wheel assembly is addressed in this paper. At first, to find out a solution in constrainted field, weighted pseudo-inverse and momentum minimized allocation are suggested instead of a general control allocation called pseudo-inverse. The second method is a structural manner to enlarge torque capability of specific axis by changing installed skew angle of wheels. Two proposed methods are applied to large angle maneuvers of satellite. Improvement of control performance and feasibility for applying to commercial satellite attitude control are demonstrated by numeric simulations.

• The Transactions of the Korean Institute of Power Electronics
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• v.6 no.6
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• pp.506-513
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• 2001

The torque of an SRM depends on the phase current and derivative of inductance. But an SRM is difficult to control the desired torques because of saturation in magnetic circuit An SRM is controlled by parameters of input voltage, and switch on , off angle The switch on off angles of an SRM regulate the magnitude and shape of current waveform and decide the magnitude and shape of torque This paper proposes an the optimization control scheme by adjusting both the switch on an switch off angle . The switch off angles are decided by reference of efficiency using simulation and experiments. The switch on angles are decided by load torque , And the dwell angles are controlled for torque control and speed control using GA-neural network which is used to simulated the reasonable switching angle.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.11a
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• pp.237-238
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• 2007

전동기 코어 소재로 사용하는 무방향성 규소강판을 토로이달 형태가 아닌 전동기 적용 모형과 동일한 적층형으로 회전자 코어를 제작하여 초기 및 포화 자화 특성에 대한 고찰을 하였다. 초기자화 특성은 전동기가 처음 기동할 때 토크나 기동전류에 큰 영향을 미친다. 초기 자화 특성을 향상시키면 기동 전류를 줄일 뿐 아니라 전동기의 장기간 수명에도 영향을 미친다. 본 연구에서는 무방향성 규소강판의 가공, 설계, 제작 특성이 초기 기동 특성에 미치는 영향을 간접적으로 조사하기 위하여 초기로 포화 히스테리시스 특성에 대한 고찰을 실시하고 이들 요소가 갖는 여러 가지 가능성을 제시하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.10
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• pp.6270-6275
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• 2014

The paper reports an improvement method on torque ripples of multi-pole interior permanent magnet synchronous motor (IPMSM) applied to a traction motor for hybrid electric vehicles. In the case of multi-pole IPMSM, the magnetic flux generated by a permanent magnet tends to leak through the bridge of the rotor without a link with stator windings. The slit design on the rotor surface was proposed to reduce torque rippling and increase the output power by reducing the leakage flux. Two design parameters for the slit are suggested for optimal design using the response surface method. As an analysis method, the 2D finite element method (FEM) was applied to consider magnetic saturation effect.

• Journal of the Korean Magnetics Society
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• v.2 no.3
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• pp.263-267
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• 1992

We have developed new techniques to measure the magnetization and coercivity of a uniaxial magnetic material using a torque magnetometer. The magnetization could be measured from the slope of the linear region in a plot of the torque ${\tau}/H$ versus the applied field H, when the direction of the applied field was normal to the uniaxial orientation. While, the coercivity could be obtained by taking the value of applied field where the torque was zero, when the direction of the applied field was $(180+{\delta})$ degrees from the uniaxial orientation. The techniques were applied to determine the magnetizations and coercivities of several Co /Pd multilayer thin films and the results were confirmed to be similar within a 2 % difference to those obtained by a vibrating sample magnetometer.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.724-725
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• 2015

본 논문에서는 모터의 방사계 소음 진동에 영향을 미치는 표면전자기력의 발생 매커니즘을 확인하고자 한다. 고정자 표면에서 발생하는 전자기력 가운데 토크에 기여하지 않는 성분을 구분하기 위해 전자리겨 성분을 Radial과 Tangential방향으로 나눈다. 이 중 토크에 기여하지 않는 Radial방향의 힘을 발생시키는 Tangential Flux Density성분의 분포를 확인하고, 자속 포화도 분포와 어떠한 관계가 있는지 확인한다. 모터의 자속밀도 및 전자기력에 대한 계산은 유한요소해석을 기반으로 한 수치 해석기법을 통해 수행하였다.