Computational Modelling for Solid-State Variable-Frequency Induction Motor Drive - II

This contribution describes a computational model of the solid-state variable-frequency induction motor drive. The model of the induction motor has been represented as a system of differential equations for flux linkages and angular velocity. These equations have been represented in Cartesian coordinate system, the use of which decreased their number to 7 instead of 10 equations and restricted the use of the model only for symmetrical conditions of operation. The output voltages applied to the terminals of the motor have been given according to voltage-versus-frequency patterns of constant V/f 2and constant V/f(1/2). This model has been developed for both transient and steady-state conditions analyses. The waveforms of the current and electromagnetic torque of the motor during sudden acceleration and deceleration have been illustrated and analyzed.