A time-stepping coupled finite element-state space model for induction motor drives - Part 1: Model formulation and machine parameter computation

A Time-stepping coupled Finite Element-State-Space model for induction moto r drives is developed. The model utilizes an iterative approach to include the effects of magnetic nonlinearities, and space harmonics-due to the mach ine magnetic circuits' topology and discrete winding layouts. Model formula tion and development, which include an improvement in the layout of the cag e circuit representation, are given in this paper. This improvement leads t o an enhancement of the "well-posedness", that is, reduction ofill-conditio ning in the overall numerical convergence of the model. Meanwhile, in a com panion paper results of induction motor performance simulation are compared with no-load and load tests for sinusoidal and inverter operating conditio ns. Particular attention is given to comparison between sinusoidal and inve rter operating losses obtained from this generalized model.