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코깅토크 저감을 위한 BLDC 전동기의 형상 설계 및 특성 분석
서경식(Kyung-Sik Seo),정상용(Sang-Yong Jung),이철균(Cheol-Gyun Lee) 대한전기학회 2014 전기학회논문지 Vol.63 No.11
This paper presents the shape design for reducing cogging torque and characteristic analysis in Brushless DC (BLDC) motor. In this BLDC motor, Δ(delta)-winding is applied, and in order to obtain the 60° trapezoidal phase back-EMF waveform, permanent magnet shape design is carried out. And then, a method on specifying design parameters to effectively reduce cogging torque is developed. back-EMF, input voltage and input current which are analyzed by the Finite Element Method (FEM) are validated by experimental results. Also, efficiency calculations based on analysis and experimental results are performed and analyzed.
정한백(Han-Baek Chung),서경식(Kyung-Sik Seo),최찬영(Chan-Young Choi),박일한(Il-Han Park) 대한전기학회 2017 전기학회논문지 P Vol.66 No.3
In this paper, we propose a separation method of the dielectric particles in the liquid flow. Since particles are dielectric in most cases, they experience dielectrophoretic(DEP) force under non-uniform electric field. The field characteristics in the electromagnetic and fluid dynamic systems are solved by using the finite element method. The motional equation of the particles is calculated by the Runge-Kutta method. The field analysis shows the feasibility of the proposed method. The particle separation model with large DEP force exerting on particles is designed by analyzing field characteristics.