Comparative Study of Dynamic Mathematical Models for Deep-Bar Rotor Induction Machine

ABSTRACT

The paper is concerned with the problem of mathematical modelling of the deep-bar rotor induction machine. Two kinds of models were analysed in this paper. The multiple-rotor circuit modal with constant parameters was presented in which the rotor circuit was replaced by a finite number of R-L sections. The method of determining of section parameters for trapezoidal rotor bars on the basis of Riccati differential equation solution was demonstrated. Then the one-rotor circuit model with parameters changing in function of the motor slip was analysed. The method of the equivalent circuit parameters determining on the base of motor nominal data for any rotor bar shape rectangular or trapezoidal was presented. Proposed models were used for simulation of asynchronous motor transients. Results of the digital simulation and laboratory tests were discussed and presented mathematical models were compared.