Vol.3, No 15, 2003 pp.1139-1146
UDC 621.87
Invited Paper
THE INFLUENCE OF NON-LINEAR EXCITATIONS
OF ASYNCHRONOUS ELECTRIC MOTORS
ON THE WORK OF DRIVING MECHANISMS OF CRANES
Zoran Marinković, Saša Marković, Dragan Marinković, Goran Petrović, Predrag Milić
University of Niš, Faculty of Mechanical Engineering, A. Medvedeva 14, 18000 Niš
Abstract. The paper considers two laboratory apparatuses driven by electric motors, used to analyze the work of driving mechanisms of cranes in the period of acceleration. In one case, a cage electric motor, while in the other a slide-ring three-phase asynchronous electric motor with non-linear characteristics of starting, is used. The movement of these mechanisms in the period of acceleration was analytically solved and simulated by means of program package MATLAB/Simulink on a PC, based on an elastic-kinetic model with two revolving masses. The results of these simulations are in high accordance with experimental notes, primarily due to non-lonear modeling of the curves of starting the electric motors. This justifies the procedures of analytic modeling and simulating the work of driving mechanisms of cranes, with the goal of obtaining a number of relevant data in the process of their design, whereby expensive experimental measurements are evaded.
UTICAJ NELINEARNIH POBUDA
ASINHRONIH ELEKTROMOTORA NA RAD
POGONSKIH MEHANIZAMA DIZALICA
U radu su razmatrana dva laboratorijska uređaja na elektromotorni pogon, kojima se analizira rad pogonskih mehanizama dizalica u periodu ubrzanja. U jednom slučaju koristi se kavezni a u drugom kliznokolutni trofazni asinhroni elektromotor sa nelinearnim karakteristikama puštanja u rad. Kretanje ovih mehanizama u periodu ubrzanja je na bazi elasto-kinetičkog modela sa dve obrtne mase analitički rešavano i simulirano programskim paketom MATLAB/Simulink na PC računaru. Rezultati ovih simulacija su veoma saglasni sa eksperimentalnim zapisima, pre svega zahvaljujući nelinearnom modeliranju krivih puštanja u rad elektromotora. Ovim se opravdavaju postupci analitičkog modeliranja i simuliranja rada pogonskih mehanizama dizalica u cilju dobijanja niza relevantnih podataka u procesu njihovog projektovanja, čime se zaobilaze skupa eksperimentalna merenja.