TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
Development of Simulation Models of Induction Squirrel Cage Motor for Variable-Speed Applications
(Dezvoltarea modelelor de simulare a motoarelor asincrone cu rotorul în scurtcircuit pentru aplicaţii cu viteza variabilă)
Vol LXII • No. 4B/2010
Vasilija Sarac, Goce Stefanov
Electrotechnical Faculty, University Goce Delcev-Stip, P.O. Box 201, 2000 Stip , Macedonia
e-mail: vasilija.sarac@ugd.edu.mk, goce.stefanov@ugd.edu.mk

 Keywords   induction squirrel cage motor, simulation models, variable speed transient characteristics.

 Abstract
Complex analysis of operational regimes of induction squirrel cage motor is performed. First mathematical model for calculation of motor's operational characteristics in FORTAN is developed. As a result of developed model motor's static characteristics of electromagnetic torque, current, speed and power factor are calculated. Further on, motor operating regimes when motor is fed by voltage inverter are analyzed and for this case motor static characteristic of electromagnetic torque is plotted. SIMULINK is used for developing motor simulation models for both cases, when motor is supplied with sinusoidal power supply as well as when it is fed by a voltage inverter. Obtained simulation results for symmetrical sinusoidal power supply are compared with data from the producer showing reasonable agreement. Different operating regimes of motor fed by voltage inverter are analysed: with increased and decreased frequency compared to the rated one while motor flux and electromagnetic torque are maintained constant. In both cases when motor is fed from voltage inverter with increased and decreased frequency compared to the rated one, obtained results of speed and electromagnetic torque are showing good agreement with expected results from analytical calculations.

 Rezumat
A fost realizată o analiza complexa a regimurilor de funcţionare a motorului asincron cu rotorul in scurtcircuit. A fost dezvoltat primul model matematic pentru calculul caracteristicilor motorului, operaţional în FORTAN. Cu modelul dezvoltat, s-au calculat caracteristica statică a cuplului electromagnetic, viteza actuală, şi factorul de putere. SIMULINK este folosit pentru dezvoltarea de modele cu motor de simulare pentru ambele cazuri, atunci când motorul este alimentat cu sursa de alimentare sinusoidală precum şi atunci când este alimentat printr-un invertor de tensiune. Rezultatele obţinute din simulare pentru alimentarea cu energie sinusoidala simetrica sunt comparate cu datele de la producător care arată acord rezonabil. Sunt analizate diferite regimuri de funcţionare a motorului alimentat prin invertor de tensiune.



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