Dynamic analysis of induction motors with saturable inductances

The paper describes the development of a computer model to simulate an induction motor including the effects of saturation on leakage and magnetizing inductance. The machine dynamics are presented by a set of nonlinear time-varying differential equations. The machine saturable inductances are modeled by closed-form nonlinear functions. A 1100 W induction motor is tested and the machine parameters are estimated. The identified model is simulated using the fourth-order Runge-Kutta method for both saturable and unsaturable inductances. The model is validated by comparing a sample simulated result with the dynamic performance measured in the laboratory.