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G. Henneberger S. Küppers Institut of Electrical Machines University of Technology Aachen |
Optimization of Claw-Pole Alternators using 3D Magnetic Field Calculation.Claw-pole alternators are used as automobile generators. The increasing amount of electronic components and small drives in card help to make vehicles safer and more comfortable. So the alternator has to deliver more current, but at the same time its total volume must not change. Parallel the average speed of the combustion engine decreases because of increasing traffic density. So the alternator has to be improved at lower speeds especially.The conventional optimization technique based on magnetic equivalent circuit and construction of a couple of samples is very time consuming, expensive and can be replaced by a more precise method. The tool that is used here bases on numerical field calculation with 3D finite elements. The electrical circuit with B6 rectifier bridge and battery is taken into account. The full calculation method was presented in an earlier paper. A first modification to improve the output current by additional permanent magnets was investigated before. An automatic parameter oriented meshing procedure was developed to investigate the influence of different sizes and to optimize the design of the alternator. In this paper the shape of the claws is modified to find an optimum current at standard stator. |
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