Steady State Modeling and Performance Analysis of Static Slip Energy Recovery Controlled Slip Ring Induction Motor Drive B. K. Singh and K. B. Naik Abstract: The paper deals with steady state modeling of static slip energy recovery controlled slip ring induction motor drive. The dc equivalent circuit model of the drive is developed using power balance relationship. The steady state performance equations of the drive are derived using the model. The predicted performance characteristics of the drive are compared with the experimental investigation. The good degree of agreement of the computed results with experimental ones proves the validity of the developed model of the drive. Key words: Energy, Induction motor, Recovery, Slip I. INTRODUCTION With the production of silicon diode and silicon controlled rectifier of adequately large ratings it becomes possible to replace all auxiliary machines of the traditional Scherbius drive by a three phase bridge rectifier and static inverter resulting in more compact static slip energy recovery (SER) controlled slip ring induction motor drive[1]. The static SER induction motor drive is popular among variable speed ac drives because of its inherent characteristics of higher efficiency, low converter cost and simple control circuit. It is being used in industrial applications such as, crane, hoist, pump and fan [2]. The speed control of the drive is achieved by regulating the rotor voltage through the firing angle of the phase commutated inverter [3]. When the firing angle is increased, high dc output voltage of the inverter prohibits the flow of rotor current, resulting low generation of torque, thereby, low speed of the drive. On the other hand if the firing angle is increased, small dc output voltage of the inverter permits the flow of higher rotor current, resulting high torque and high speed. The modeling of static SER induction motor drive has been approached by large number of authors. Fig. 1 Schematic block diagram of static SER controlled slip ring induction motor drive Manuscript received on December 28, 2008. B. K. Singh is with Electronics and Comm. Engg. Department, Kumaon Engineering College, Dwarahat, Almora, Uttarakhand, India: 2636553 (Phone No. 915966-244107; Fax: 915966-244114, e-mail: bksapkec@yahoo.com K. B. Naik is with College of Engineering Science & Technology, Lucknow, U. P., India, e-mail: kbnaik@yahoo.com Proceedings of the International MultiConference of Engineers and Computer Scientists 2009 Vol II IMECS 2009, March 18 - 20, 2009, Hong Kong ISBN: 978-988-17012-7-5 IMECS 2009