DETERMINING THE OPTIMAL LINIAR CURRENT
DENSITY VALUE FOR SYNCHRONOUS
This work presents the way linear current density values influences the dimensions, costs, and performances of some synchronous generators. The studied generators, with various rated speed, were designed following classic and optimal methods in order to determine the linear current density optimal value depending on a specific optimization criterion. The optimal design has been realized with the Simplex algorithm where the objective function aims total cost reduction for the synchronous generator. The linear current density value has been determined for both the classical design and for the optimized solution. Comparing the two results we analysed the impact these variable has on the synchronous generator’s dimensions, mass, losses, on the generator’s efficiency, costs, and flask currents. We draw conclusions referring to the optimal value tendency for the linear current density depending on its variation interval and on the generator’s rotation speed.
From the analysis we observe that to achieve a cost-optimal synchronous generator, the linear current density value must be chosen close to the upper limit of the variation interval.
Keywords: the objective function, the optimal design, synchronous generator, current blanket
Cuvinte cheie: funcţie obiectiv, proiectare optimală, generator sincron, pătura de curent