The Induction Motor in Steady State

Abstract

The Finite Element Method (FEM) has been used extensively in the analysis, of induction machines. This chapter describes the use of magneto-dynamic analysis to study the induction machine in the frequency domain. This information gives average torque, losses and flux density. The solutions can also be used to find equivalent circuit parameters. The magneto-dynamic solution has two other applications. By coupling the solution to external circuits we can obtain a Bode diagram from which a model can be synthesized. This is a simulation of the SSFR (stand still frequency response) test. A second application involves the time domain analysis of the induction motor described in the following chapter. While only the steady state solution may be of interest, it may take many cycles of computation before the starting transient disappears. This information may be of no interest. We can use the frequency domain solution to find initial conditions for the time domain analysis. It is found that when the transient solver is started from the frequency domain solution, the first cycle is close to the steady state solution.