• Proceedings of the KSME Conference
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• 2005.11a
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• pp.170.2-170.2
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• 2005

• Transactions of the Korean Society of Mechanical Engineers A
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• v.35 no.3
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• pp.241-250
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• 2011

The new gerotor developed in this paper has an inner rotor in which a circular arc is inserted between the hypocycloid and epicycloid curves, whereas the outer rotor is designed using the simulation results for the rotor and a modification method. The new gerotor has no cusps and loops and no limit on the eccentricity. We increase the average flow rate by adding a new design parameter, $\gamma$, which is the inclined angle of the inner rotor at the intersection of the hypocycloid and the circular arc. A calculation method to calculate the chamber area is also developed. This method can also be used to calculate the flow rate and flow rate irregularity when the contact points are unknown. The control of eccentricity and $\gamma$ is expected to lead to an efficient rotor.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.2044-2045
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• 2007

코로나 발생은 전극의 첨점이 형성되어 전극에 전계가 집중될 경우 불균질성에 의한 방전이다. 수용가용 154kV 인류형 클램프 말단의 전선처리는 코로나 발생을 가속시켜 전력손실, 노이즈 발생 등의 영향을 미친다. 본 연구에서는 수용가용 154kV 수전설비용 자기애자 (Porcelain Insulator)와 가공선로(Overhead Line)의 지지용 금구사이에서 발생하는 코로나 특성을 고찰하였다, 일반적 방법으로 확인 되지않는 코로나를 UV Image 이용하여 애자의 소손 위험성 및 상태를 제시하였으며, 유한요소법(FEMLAB)을 이용하여 나전선의 길이별로 전계분포에 의한 위험성을 제시하였다. 수전설비의 설치조건 및 금구류의 유지보수 및 안전성 향상에 활용될 것으로 기대한다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.39 no.12
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• pp.1237-1244
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• 2015

A gerotor can be manufactured in a miniature size because it has a high discharge per cycle and a simple structure. Gerotors are widely used for the lubrication oil of an engine and as the hydraulic source of an automatic transmission. Recently, improvements in fuel efficiency and noise reduction have come to the fore in the automobile industry, and it has been necessary for better fuel efficiency to continuously improve the flow rate and noise of internal gear pumps through the optimal design of the gerotor and port shape. In this study, gerotors were generated based on the equations derived for a lobe shape with multiple profiles (ellipse 1-elliptical involute-ellipse 2). The ranges of the design parameters were considered to prevent a cusp and loop. In addition, the optimal lobe shape was obtained by determining the influence of the lobe shape on the performances (flow rate, irregularity, etc.), according to the values of the design parameters.