PHYSICS /BK21 Colloquium (08/05/16)
관련링크
본문
"Ac magnetic properties measurement under magnetic induction waveforms including higher harmonics
연사: 손대락 교수[한남대]
일시: 2008 년 5 월 16 일 오후 3시
장소: 무은재 기념관 307호 (멀티미디어 강의실)
ABSTRACT:
Under standard measurement conditions, the magnetic properties of electrical steel is to be measured only under the condition of sinusoidal waveform of the magnetic polarization. However the actual magnetic polarization waveforms of the electric machine are almost always not sinusoidal because of the material behavior (anisotropy, non-linear B-H performance in high polarization regions such as the stator tooth of electrical machines), because of PWM modulated voltage for variable speed motors and because of the layout of the magnetic circuit and the winding scheme (tooth harmonics). Magnetic properties obtained by the standard method are not really applicable to an actual electrical machine design because the magnetic properties of ferromagnetic material cannot be predicted easily due to non-linear and hysteresis effects, but these higher harmonic polarizations bring about a large increase in magnetic loss. This seminar reviews methods for measurement of the magnetic properties of electrical steels under the condition of magnetic polarization which include higher harmonic components, and analysis and prediction of their magnetic properties.
문의처: 민병일(054-279-2074, bimin@postech.ac.kr)
"
연사: 손대락 교수[한남대]
일시: 2008 년 5 월 16 일 오후 3시
장소: 무은재 기념관 307호 (멀티미디어 강의실)
ABSTRACT:
Under standard measurement conditions, the magnetic properties of electrical steel is to be measured only under the condition of sinusoidal waveform of the magnetic polarization. However the actual magnetic polarization waveforms of the electric machine are almost always not sinusoidal because of the material behavior (anisotropy, non-linear B-H performance in high polarization regions such as the stator tooth of electrical machines), because of PWM modulated voltage for variable speed motors and because of the layout of the magnetic circuit and the winding scheme (tooth harmonics). Magnetic properties obtained by the standard method are not really applicable to an actual electrical machine design because the magnetic properties of ferromagnetic material cannot be predicted easily due to non-linear and hysteresis effects, but these higher harmonic polarizations bring about a large increase in magnetic loss. This seminar reviews methods for measurement of the magnetic properties of electrical steels under the condition of magnetic polarization which include higher harmonic components, and analysis and prediction of their magnetic properties.
문의처: 민병일(054-279-2074, bimin@postech.ac.kr)
"
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