Influence of End Region Structure on the Equivalent Circuit Based on Frozen Permeability for Induction Machines

The influence of the end clamping plates on the induction machine performance is generally ignored in the initial design stage, resulting in the inaccurate calculation of the machine torque, loss and power factor. In this paper, a novel calculation method of end leakage inductances is proposed based on the frozen permeability approach. Considering the influence of the end clamping plates, the main performances of the induction machine are estimated and discussed. Moreover, according to the results from 3D finite element analysis, an improved equivalent circuit is proposed and compared with the traditional one taking the end region structures into account.