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이지은(Ji-eun Yi),노명규(Myoungyu Noh) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Advances in permanent magnet materials have increased the applications that use permanent magnets. Permanent magnet passive bearings use the repulsive forces between two sets of permanent magnets so that contact free rotation is possible. Various magnetization patterns have been used to achieve the bearing function. Further, several layers of magnets can be used to increase the stiffness. In order to design a passive bearing properly, it is important to calculate the stiffness for various magnetization patterns and arbitrary number of layers. In this paper, we used the current sheet method where the permanent magnets are replaced with the equivalent current sheets. Then we can obtain the stiffness analytically. The result of the current sheet method is compared with the finite element method. The results show that there exists an optimal geometry for maximum stiffness.
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이학인(Hak-in Lee),유승열(Seong-yeol Yoo),이지은(Ji-eun Lee),노명규(Myoungyu Noh) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
We have designed a micro flywheel energy storage system in which the flywheel stores the electrical energy in terms of the kinetic energy and converts this kinetic energy into the electrical energy when necessary. The flywheel is supported by two radial permanent magnet passive bearings. Permanent magnet passive bearings use the repulsive forces between two sets of permanent magnets so that contact free rotation is possible. The toroidally-wound BLDC motor which has high efficiency and little additional negative radial stiffness is used for motoring and generation. Micro flywheel energy storage system is optimally designed to have the maximum energy storage capacity. In this paper, we present the design process of the micro flywheel energy storage system.
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