Comparison of reduced-order dynamic models of induction machines

The paper deals with the validity of various dynamic models of induction ma chines. The fifth-order Park model and various reduced-order models are use d to predict the low-frequency dynamic response of a 15 kW induction machin e, and the theoretical results are compared with an extensive series of mea surements. Several transfer functions are investigated in the perturbation frequency region below 35 Hz using three types of basic excitations: pertur bations in the shaft torque, supply voltage and supply frequency. The maxim um perturbation frequency for an error less than 10% is used to study the v alidity range of the models; this range is evaluated for each model and tra nsfer function, using the data of 31 different machines, The influence of t he machine parameters and various physical phenomena is studied, The result s show that a large number of transfer functions is needed for judging the general validity of a dynamic model.