Novel Dynamic Model for a Three-phase Induction Motor with Iron Loss and Variable Rotor Parameter Considerations

Iron loss is traditionally neglected in the dynamic analysis of induction motors. Nowadays, however, with more emphasis on improving efficiency in machines and torque control in variable speed drives, the inclusion of iron loss in the machine model needs to be re-addressed. This paper presents a novel model for use in the design and analysis of 3-phase induction motors that incorporates iron losses as well as rotor parameter variations. Simulation results are confirmed by comparison with the conventional steady-state model, measured steady-state performance and measured dynamic machine performance. The correlation between the measured performance and predicted performance is excellent. The error introduced by neglecting iron loss is also shown.