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

摘要

In the design of a large generator, in order to determine the best transposition method of stator windings so as to avoid circulating and local overheating. It is necessary to accurately calculate the electromagnetic field in end-windings. But because the shape of end-windings is complicated, so in the previous models, the distributed end-windings are always replaced by continuous equivalent sheet or line current concentrated on the center line of windings, it is not possible 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, 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 the integral method, and then the best transposition method is determined.