A time-stepping coupled finite element-state space model for induction motor drives - Part 2: Machine performance computation and verification

In a companion paper, a Time-Stepping Coupled Finite Element State-Space al gorithm for modeling of induction motor drives was developed. The model for mulation and algorithm allows one to rigorously model the effects of space harmonics caused by magnetic circuit nonlinearities, topology and winding l ayouts, as well as their interaction with time harmonics caused by the powe r condition (inverter) operation. In this paper, the model is used in the c omputation of the parameters and prediction of performance characteristics of a 3-phase, 2 pole, 1.2-hp, 208 Volts squirrel-cage case-study induction motor. In addition, emphasis is laid on comparison between sinusoidal and i nverter operations, with regard to effects on ohmic and core losses, as wel l as torque ripples. Furthermore, this includes harmonic breakdowns of sele cted inductance profiles and developed torque profiles. Numerical simulatio ns were verified by comparison to test data with excellent correlation betw een both sets of results.