[حمید]

چنانکه می دانید جهت کنترل آثار سوء ناشی از پدیده اثر پوستی و افزایش تلفات ناشی از آن شمشهای مسی در الترناتورهای بزرگ به نوارهای باریکتر تقسیم می شوند. در این حالت برای کنترل جریانهای گردشی ناشی از شار پراکندگی اعمالی به آنها عمل ترانسپوزیشن توصیه می شود. بنابراین تکنیک فوق یک فاکتور مهم طراحی سیم پیچی بویژه در موتورهای بزرگ محسوب می شود. Despite the fact that the resistance factor is proportional to the square of the number of conductors on top of each other, zt, to reduce the resistance factor and eddy current losses in conductors, the conductors are divided into subconductors, which are connected together only at the beginning and at the end of the winding. To get the full benefit of dividing the conductors, circulating currents in the conductors must be prevented. To prevent such circulating currents flowing through the connections at the beginning and at the end of the winding, every parallel-connected subconductor has to be surrounded exactly by the same amount of slot leakage flux. This is put into effect by transposing the subconductors. If the number of subconductors is zp, the transposition has to be done zp ? 1 times. For instance, if a winding consists of six coils and the conductors are divided into three subconductors, the transposition has to be done twice, which can be done at the end winding area after every two coils, Figure below.