Calculation of Short-circuit Resistance due to Interlocking Laminated Cores in Rotating Machines

Interlocking is a promising technique for assembling laminated electrical steel sheets in electrical machines. However, it can create short circuits along the lamination direction, leading to additional eddy-current loss. For a better prediction of the efficiency of electrical machines, the additional loss should be calculated accurately. In this study, we have estimated the electrical resistance of the short circuits caused by interlocking. First, we measured the resistance between various points in a laminated core. Next, using a circuit simulator, we calculated the resistance of the short circuits. The value of resistance obtained in this study will be used for the calculations of eddy-current loss in electrical machines.