Multi-objective Optimization Design of Multiphase Permanent Magnet External Rotor Pulsed Alternator

In order to rapidly optimize the current waveform quality and the projectile velocity of the electromagnetic launch system, the multiphase trigger angle optimization problem of the pulsed alternator is simplified based on the two-dimensional finite element analysis and circuit co-simulation, and the corresponding equivalent circuit model is established. Based on the splitting process of armature winding, three kinds of trigger angle optimization strategies are proposed, which are equivalent two-phase, equivalent four-phase and full eight-phase. Based on the equivalent circuit, aiming to obtain the best current waveform quality and the maximum projectile velocity of the electromagnetic launch system, three trigger angle optimization strategies are optimized by using multi-objective genetic algorithm. Among the Pareto frontier points obtained by the three optimization strategies, the points with similar projectile velocity are selected as the optimization results, and the results show that they have similar output characteristics, which verifies the effectiveness of the three trigger angle optimization strategies. At the same time, the trigger angle optimization strategy can be extended to the pulsed alternator with similar armature winding characteristics, which has certain reference significance for the optimization of pulsed alternator.