A new method to determine the 3-D field and transposition way of large generator

In the design of a large generator, in order to determine the best transposition way of stator windings so as to avoid circulating and local overheating, it is necessary to accurately calculate the electromagnetic field in the end-windings. Because the shape of the end-windings is complicated, the distributed end-windings are always replaced by continuous equivalent sheet or line current concentrated on the center line of windings, it is unable to calculate the electromagnetic field in the strands of end-windings. In the paper, the end-windings are considered as many rectangular current element rigid bodies, the position-posture matrix in robot mechanics is applied for the first time to describe the current body´s position, and 3-D distributed stator current in end-windings is considered exactly. The electromagnetic field in the end winding´s strand of a large hydraulic-generator is calculated by an integral method, and then the best transposition way is determined