Comparison of Simulation Results for Two Types of Induction Motors Using Conventional and Variable Speed Drives

This paper comprehensively compares simulation results for two distinct types of induction motors: wound rotor motors and squirrel cage motors. Both motor types are assessed under identical operating conditions, rated explicitly at 2750 kW, 6.6 kV, and 50 Hz. The study aims to evaluate and analyse two different control methodologies. The first control method employs a conventional approach involving fixed-speed operation and standard control techniques. The second method used an advanced variable-frequency drive system. It removed all the direct online equipment, allowing dynamic motor speed adjustment and improved performance for the second proposed control method. The torque improvement by the second method is more than 20%, and the starting current is very low (there is no inrush current), which saves money. Through detailed simulations, this research highlights the differences in efficiency, torque characteristics, and overall operational effectiveness between these two motor types and their respective control strategies.