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As known electrodynamic levitation occurs without active control due to motion induced eddy currents. There are two main drawbacks related to electromagnetic bearings: 1) the presence of losses caused by the eddy currents, and 2) the onset of instability in undamped supercritical rotor systems. Accurate analysis of these devices, especially when the axial symmetry cannot be assumed, can be performed...
In this paper the design optimisation of a 2.2 kW, double rotor, radial axis eddy current coupling operating at 97 % efficiency, designed for a wind turbine drive train application is described. A computationally efficient finite element analysis in conjunction with gradient (MMFD) and population (NSGA) based design optimisation algorithms is used in order to obtain an optimal coupling design. The...
A simple and accurate AC resistance model is essential for online estimation of copper loss which can be utilized in several ways of controlling and monitoring. This paper presents application of Squared Field Derivative on three-phase IPM machine to model AC resistance of rectangular conductors. It focuses on Finite Element Analysis to validate analytical model. The deviations from analytical model...
The performance of the optimized conventional, novel E- and C-core flux-switching permanent magnet (FSPM) machines having different combination of stator and rotor pole numbers is compared by finite element analyses, with particular reference to the conductor and magnet eddy current loss and iron loss. Both iron loss and conductor eddy current loss increase with the rotor pole number, while the 11-...
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