Abstract
The electromagnetic force (EMF) generated by planar spiral coils has been broadly applied as actuators in electromagnetic forming, launching, and driving. The distribution of the EMF strongly affects the performance of these actuators, especially in conditions with the allowable stress limits. But its optimization mainly depends on finite element analysis (FEA). Because there is no analytical model to describe the relationship between the distribution and parameters of the coils, optimization is normally highly time-consuming. To solve this problem, we established a model of two coupled coils based on the principle of virtual work, and then a procedure to optimize the distribution of the EMF by using the established model and a proposed genetic algorithm that adjusts the spacing intervals of the coils. Compared to traditional optimization based on FEA, this optimization method can find the desired parameters of the coils much faster.
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