PDF] Speed Control of Three Phase Slip Ring Induction Motor Using Chopper

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In recent years induction motors are the widely used electrical motors due to their reliability, low cost and robustness. But, characteristically the induction motor does not have the capability of variable speed operation. Due to this reason, formerly dc motors were applied in most of industry. But nowadays speed control methods of the induction motor have developed to their large scale used in almost all industries. The aim of this paper is to make a simple control system for speed variations of a Slip Ring Induction Motor as an extension to the available non slip power recovery system available for low power SRIMs. There are numerical methods to improve the Speed but most easy ways of speed control of a slip ring induction motor is either from the stator or rotor side. The system employed here is to control the speed via bridge circuit and on/off switch at the rotor side of this slip ring induction motor. Here the core system is to control the high power system by directly varying the rotor side current by using the single IGBT which is used as a chopper.