Slip ring induction motor is used as a variable speed drive in SERIM scheme. The speed of SRIM can be easily control by simple & primitive method, mechanically variation of rotor circuit resistance. This method of speed control has is very inefficient because the slip energy is wasted in rotor circuit resistance. However, several advantages of this method are as absence of in-rush starting current, availability of full rated torque at starting, high line power factor, absence of line current harmonics, and smooth & wide range of speed control. This wasted power can be utilising by so many techniques are available like chopper control, Static Kramer Drive and static Scherbius drive. This paper deals with the slip energy recovery scheme using power electronic based converter technique of power recovery and energy saving with thyristor control is achieved, the simulation is made in MATLAB environment.

1. Jawed Faiz,H. Barati, and EyupAkpinar, "Harmonic Analysis and Performance Improvement of Slip Energy Recovery Induction Motor Drives," IEEE Transactions on Power Electronics, vol. 16, NO. 3, pp 410-417, May 2001
2. W. S. Zakaria, A. A. Shiiltout& S. E. Alrvash, "A Novel Double-Circuit-Rotor Balanced Induction Motorfor Improved Slip-Energy Recovery Drive Performance Part I1 : Experimental Verification & Harmonic Analysis", IEEE Transactions on Energy Conversion, vol. 11, No. 3, pp 563-569 ,September 1996.
3. Lavi, & R. J. Polge, "Induction Motor Speed Control with Static Inverter in the Rotor", IEEE Transactions On Power Apparatus And Systems, VOL. PAS-85, NO. 1,pp. 76-84, January, 1966
4. L. Refoufi&P,Pillay, "Harmonic Analysis Of Slip Energy Recovery Induction Motor Drives", IEEE Transactions on Energy Conversion, Vol. 9, No. 4, pp 665-672,December 1994.
5. E. Akpinar, P. Pillay& A. Ersak, "Starting Transients In Slip Energy Recovery Induction Motor Drives- Part 1: Formulation And Modeling" IEEE Transactions on Energy Conversion, Vol. 7. No. 1,pp. 238-244 March 1992.
6. E. Akpinar and P. Pillay, "Modeling and Performance Of Slip Energy Recovery Induction Motor Drives", IEEE Transactions on Energy Conversion, Vol. 5, No. 1, pp 203-210,March 1990.
7. M. Ramamoorthi, and NS Wani,"Dynamic Model for Chopper Controlled Slip-Ring Induction Motor" IEEE Trans. On Industrial Electronics and control Instrumentation. Vol. IECI-25 , no. 3, pp 260-266, Aug. 1978.
8. B. K. Bose, Advance Power Electronics and AC Drive. Englewood Cliffs, NJ: Prentice-Hall, 1988.
9. Jagendrasingh, Swati Rani,&Rohini, " Slip Power recovery system in Three Phase Slip Ring Induction motor", IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE).
10. H. Azizi, A. Vahedi& M. A. S Masom, "Study of Slip Energy Recovery of Induction Motor Drive Using Matlab/SimuIink",pp 563-569
11. M. T. Outeiro , E. S. Saraiva , "Harmonics on the Electromagnetic Torque of a Slip Energy RecoverySystem with Two Thyristor Bridges and no DC Coil"pp. 1-8.
12. J. D. Van Wyk, "Variable-speed a. c. drives with slip-ring induction machines and a resistively loaded force commutated rotor chopper",Electric Power Applications, October 1979, Vol. 2, No. 5,pp. 149-160
13. Dhaval D. Mer, Rakeshkumar A. Patel & Manish G. Prajapati, "Comprehensive Study of Speed Control And Power Loss Analysis Using Rotor Resistance And Slip Power Recovery Method", International Journal Of Innovative Research In Electrical, Electronics, Instrumentation And Control Engineering,Vol. 2, Issue 3, March 2014.

Slip Ring Induction Motor slip Power Recovery.