Performance of SliP Ring Induction Motor using Switched Capacitors in The Rotor Circuit

Abstract

The use of induction motors for variable-speed industrial drive applications has always been a valuable suggestion. The induction motor, often the best choice among AC machines for many industrial tasks, is simple and best in construction. In this thesi3 a technique for induction motor speed control is illustr<..ted. This technique uses switched capacitors to replace resistors in the rotor side.The speed control IS accomplished by • controlling the switched frequency of the capacitor. An experimental system is built and tested for motor performance and operation. This method provides a mean of speed control which is simple and continuous. It is well suited to electronic control using any suitable electronic circuit . Many researches have focused on speed control of slip nng induction motors by switched capacitor in rotor. Abdel Fattah, EI-Deep, Am in and EI-Nahry studied in [I] the speed control of the slip nng induction motor usmg a microprocessor to drive a power transistor switched capacitor circuit on the rotor side. The steady-state performance of this motor is studied in [2]. A dynamic model is developed to study the open loop and closed loop drive performance , also theoretical and experimental results for the transfer functions