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Cell equalization is a critical technology to enlarge battery pack capacity and prolong battery cycle life. A cell equalizer based on an isolated bidirectional flyback converter is introduced in this paper. Energy can be transferred from one cell to the pack or from the pack to some cell through a double winding transformer. An n-MOSFET and a milliohm resistor for current sampling are connected to...
It is presented in this paper an active magnetic levitation system used for the nanogram detection in biomedical domain. The design, simulation and levitation experiment are presented in detail. The device is composed of three parts: planar coil electro magnetic (EM) as lower stator, permanent magnetic (PM) as rotor and capacitance plate as lower stator. The levitation force versus displacement is...
An electrostatically levitated gyroscope based on UV-LIGA fabrication process is introduced. The stable levitation is vitally important for the gyroscope to work efficiently. Two types of levitation control model of such a device are presented to realize initial levitation. The axial squeeze film damping coefficient is calculated by finite element analysis and deduced by analytical solution. From...
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