Dynamic modelling and simulation of squirrel-cage asynchronous machine with non-linear effects

The paper presents the dynamic modelling and computer simulation of a squirrel-cage induction machine with non-linear effects. The computer simulation for the transient operation is obtained from the non-linear differential system of equations which describe the induction machine in the rotor reference frame and with currents as state variables. It is shown that by using the characteristic data available from d.c. measurement, no-load, Blocked rotor and retardation tests of the machine as well as the results obtained from the optimisation of the T-model rotor circuit, accurate simulation of the machine under dynamic condition is possible. The simulated time function of the transient current, mechanical speed and shaft torque characteristics of the machine are compared with the experimental results.