Modeling and Experimental Analysis of Dynamic Characteristics of Asynchronous Motor

Mathematical modeling of dynamic modes of asynchronous machines is an important tool both to the study of processes occurring in asynchronous motors, and to the design of asynchronous drives. Therefore, the problem of developing the mathematical models of asynchronous machines taking into account the influence of real factors on the parameters remains relevant. The mathematical model of asynchronous machine, based on differential equations in a two-phase orthogonal coordinate system associated with the stator, is present in the article. To take into account the influence of iron losses on mutual inductances, it is proposed using the functions of the magnetic lag angle. The model also takes into account the influence of current displacement in the rotor bars and the influence of saturation both along the path of the main magnetic flux and along the paths of the stator and rotor leakage fluxes. The description of the computer program that implements the model and allows simulating the transients of the asynchronous motor is present. The results of experimental studies of the asynchronous motor start under sinusoidal voltage using a computer stand, and comparison of the oscillograms obtained with simulation results on the proposed model are presented. The comparison between experimental and calculated oscillograms of the current and rotation speed of the investigated asynchronous motor allows making a conclusion about satisfactory accuracy of the offered model and possibility of its application to modeling and analysis of asynchronous electric drives.