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V/F Control of Squirrel Cage Induction Motor Drives Without Flux or Torque Measurement Dependency
Walid Emar, Hussein Sarhan, Rateb Al-Issa, Issam TTrad
Pages - 77 - 92     |    Revised - 01-05-2011     |    Published - 31-05-2011
Volume - 2   Issue - 2    |    Publication Date - May / June 2011  Table of Contents
Induction Motor Drive, Constant Volts Per Hertz, Torque Speed Curve, Dq Transformation, State-Space Model
Based on the popular constant volts per hertz principle, two improvement techniques are presented: keeping maximum torque constant or keeping magnetic flux constant. An open-loop inverter-three-phase squirrel-cage induction motor drive system that provides constant maximum torque or increased maximum torque and reduced slip speed at frequencies below the nominal frequency has been modeled, simulated and tested. Load performance analysis of the proposed system under different operation conditions was provided. These principles of operation are extended to the case of operation from variable frequency or variable voltage control method. Finally, the effects of the non-sinusoidal voltage and/or current wave shapes are covered. The results show that both suggested improvement techniques (constant torque or constant flux) improve the steady-state performance A.C. drive system with squirrel cage induction motors. The slip speed has been decreased and the starting torque and maximum torque have been increased, which means that the suggested control techniques can be used in drive systems with short time operating mode under light loads.
CITED BY (4)  
1 ALI, J. A.,Hannan, M. A., & Mohamed, A. (2015). Rule-based Fuzzy and V/f Control for Induction Motor Speed Responses Using SVPWM Switching Technique. Przeglad Elektrotechniczny, 91(3), 133-136.
2 El-Saady, G., Ibrahim, E. N. A., & Elbesealy, M. A Fuzzy V/F Control for High Performance Induction Motors Drive.
3 Sai, P., Choudhary, D., & Varshney, M. Control of induction machine connected through long cable and Isolation Transformer.
4 El-Saady, G., Ibrahim, E. N. A., & Elbesealy, M. An Improved V/F Control for High Performance Three Phase Induction Motor Drive.
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Dr. Walid Emar
- Jordan
Mr. Hussein Sarhan
- Jordan
Mr. Rateb Al-Issa
- Jordan
Mr. Issam TTrad
- Jordan

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