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This paper reports electric properties calculation of a composite housed SF6 insulated bushing based on the finite element method. After introducing different stages of electric field distribution under DC voltage, the finite element method and boundary conditions are described. The electric field distribution, time constant of transmission from conductive distribution to resistive distribution are...
The split ratio, i.e. the ratio of stator bore radius to stator outer radius, is an important design parameter for permanent magnet (PM) linear machines, as it significantly influences the thrust force capability and efficiency. The optimal split ratio for maximum thrust force is investigated analytically for both surface-mounted PM (SPM) and interior PM (IPM) E-core linear oscillating actuators....
An improved analytical model is developed to predict the electromagnetic performance of a single-phase tubular oscillating permanent magnet actuator. The analytically predicted thrust force, flux-linkage and back-EMF coefficient of an actuator equipped with a quasi-Halbach magnetized mover are compared with results deduced from finite element analyses and measurements. In addition, the influence of...
Several novel linear, either planar or tubular, flux-switching permanent magnet (FSPM) brushless machines with different winding configurations and mover slot/stator pole combinations are proposed and compared, with particular reference to the tubular format. Coil connections are determined from the coil back-EMF vectors. The influence of major design parameters, such as the split ratio, the stator...
Single-phase permanent magnet (PM) linear oscillating actuators having alternative topologies are designed and analyzed by finite element analysis, with particular reference to a novel tubular E-core interior permanent magnet (IPM) oscillating actuator. Their electromagnetic performance is compared and relative merits are evaluated. It shows that the E-core actuators exhibit much less end flux leakage...
In this paper, the FEM (finite element method) for the quasi static condition has been applied to evaluate the EM field interaction with the cells in different shapes, such as ellipsoid. The influences of the cells shape and its orientation to the applied electric field have been assessed. The results obtained have cast light on a number of observations in the process of electroporation.
At the present there exist two different types of riot helmet shells, a thermoplastic and a composite shell. The composite shell is believed to be superior in impact performance, but more expensive and complicated in manufacturing partially due to the fact that the textile reinforcement material has to be cut into pattern pieces before they can be applied to the helmet shaped mould. However, the discontinuation...
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