Document Type : Original Research Paper


1 Department of Electrical Engineering, Shri Randeobaba College of Engineering and Management, Nagpur, India

2 Department of Electrical Engineering, Visvesvaraya National Institute of Technology, Nagpur, India.


Pulse-width modulated (PWM) adjustable frequency drives (AFDs) are extensively used in industries for control of induction motors. It has led to significant advantages in terms of the performance, size, and efficiency but the output voltage waveform no longer remains sinusoidal. Hence, overshoots, high rate of rise, harmonics and transients are observed in the voltage wave. They increase voltage and thermal stresses; resulting into accelerated insulation aging. This paper presents the application of fuzzy logic to life estimation of PWM driven induction motors. Insulation stress parameters are experimentally computed for wide range of switching frequency and used in fuzzy logic based life estimation algorithms. The results obtained with the fuzzy expert system show a performance approaching that attainable for the life model based on the inverse power law.


[1] P. Lezana, J. Rodriguez, M. A. Perez, and J. Espinoza “Input Current Harmonics in a Regenerative Multi-cell Inverter with Single-Phase PWM Rectifiers”, IEEE Trans. on Industrial Electronics, vol.56, pp. 408-417, Feb. 2009.
[2] D. Fabiani, A. Cavallini, and G. C. Montanari, “Aging Investigation of Motor Winding Insulation subjected to PWM Supply”, in Proc. Of IEEE Conf. on Elect. Ins. & Dielect. Phenomenon (CEIDP), pp 434-457, 2009.
[3] G. C. Montanari, A. Cavallini, and A. Caprava, “Partial Discharge activity and Aging of Power Electronics Controlled Motors”, in Proc. Of IEEE International symposium on Elect. Insulating Materials (ISEIM), pp. 168-171, 2005.
[4] G. C. Montanari and D. Fabiani, “The Effect of Non-sinusoidal Voltage on Intrinsic Aging Of Cable & Capacitor Insulating Materials” IEEE Trans. on Dielectrics & Elect. Insulation, vol.6, pp 798-802, Dec-1999.
[5] T. G. Arora, M. V. Aware, and D. R. Tutakne, “Accelerated Insulation Aging in Thyristor Controlled Single Phase Induction Motors”, International Joint Journal of Conferences in Engineering, vol.1, pp 54 – 57, May-2009.
[6] Ghinello, G. Mazranti, D. Fabiani and A .Cavallini, “An Investigation of the Endurance of Capacitors Supplied by Nonsinusoidal Voltage”, Proc. Of IEEE CEIDP, Atlanta, USA, pp 723- 727, Oct-1998.
[7] T. G. Arora, M. V. Aware, and D. R. Tutakne, “Accelerated Insulation Aging in Phase Angle Controlled Single Phase Induction Motors”, in Proc. IEEE International Region Ten conference (TENCON-09), Nov-2009.
[8] C. Hudon, N. Amyot, T. Lebey, P. Casteian, and N. Kandev, “Testing of Low-voltage Motor Turn Insulation Intended for Pulse-width modulated Applications”, IEEE Trans. on Dielectrics & Elect. Insulation, vol.7, pp 111-121, Dec-2000.
[9] J. P. Bellommo, P. Casteian, and T. Lebey, “The Effect of Pulsed Voltage on Dielectric Material Properties”, IEEE Trans. on Dielectrics & Elect. Insulation, vol.6, pp 20-26, Feb-1999.
[10] T. G. Arora, M. V. Aware, and D. R. Tutakne, “Fuzzy Logic Application to Life Estimation of Phase Angle Controlled Induction Motors”, International IEEE Symposium on Diagnostic of Electrical Machines and Power Electronic Drives (SDEMPED-09), August-2009.
[11] V. Mihaila, S. Duchesne, and D. Roger, “A Simulation Method to Predict the Turn-to-turn Voltage Spikes in a PWM Fed Motor Winding” IEEE Transactions on Dielectrics and Electrical Insulation, vol. 18, pp 1609-1615, October 2011.
[12] S. U. Haq, S. H. Jayaram, and E. A. Cherney, “Evaluation of Medium Voltage Enameled Wire Exposed to Fast Repetitive Voltage Pulses”, IEEE Trans. on Dielectrics & Elect. Insulation, vol.1, pp 194-203, Dec- 2007.
[13] A. Cavallini and G. C. Montanari, “Effect of Supply Voltage frequency on testing of Insulation System”, IEEE Trans. on Dielectrics & Elect. Insulation, vol.13, pp 111-121, Dec-2006.
[14] E. Sharifi, S. H. Jayaram, and E. A. Cherney, “Analysis of Thermal Stresses in Medium-voltage Motor Coils under Repetitive Fast Pulse and High-frequency Voltages”, IEEE Trans. on Dielectrics & Elect. Insulation, vol.17, pp 1378-1384, Dec-2010.
[15] H. Okubo, N. Hayakawa, and G. C. Montanari, “Tech. Development on PD Measurement & Elect. Insulation Tech. for Low Voltage Motors Driven by Voltage Inverters”, IEEE Trans. on Dielectrics & Elect. Insulation, vol.6, pp 1516-1530, Dec-2007.
[16] E. Lindell, T. Bengtsson1, J. Blennow, and S. M. Gubanski, “Influence of Rise Time on Partial Discharge Extinction Voltage at Semi-square Voltage Waveforms”, IEEE Trans .on Dielectrics & Elect. Insulation, vol.17, pp 141-148, Feb-2010. [17] S. M Gubanski, B. Sonerud., T. Bengtsson, and J. Blennow., “Dielectric Heating in Insulating Materials Subjected to Voltage Waveforms with High Harmonic Content”, IEEE Trans. on Dielectrics and Elect. Insulation, vol. 16, pp 1926-1931, August2009.
[18] A. Tzimas., S. Rowland., L. A. Dissado, M. Fu, and U.H. Nisson, “Effect of Long Time Electrical and Thermal Stresses upon the Endurance Capability of Cable Insulation Material”, IEEE Trans. on Dielectrics and Elect. Insulation, vol.6, pp1436-1443 Oct-2009.
[19] S. Grubic, J.M. Aller, B. Lu, and T.G. Habetler, “A Survey on Testing and Monitoring Methods for Stator Insulation Systems of Low Voltage Induction Machines Focusing on Turn Insulation Problem”, IEEE Trans. on Industrial Electronics, vol.55, pp 4127-4136 Dec- 2008.
[20] E.Cox; The Fuzzy System Handbook, A.P.Professional Press, Cambridge M.A., 1994.
[21] G. C. Montanari, G. Mzzanti, and A. Cavallini, “Progress in Electrothermal Life Modeling of Electrical Insulation during the Last Decades”, IEEE Trans. on Elect. Insulation, vol.9, pp 1730-1741, Oct-2002.
[22] G. C. Stone, E. A. Boulter, I. Culbert, and H. Dhirani; Electrical Insulation for Rotating Machines, IEEE Press series on Power Engineering, Piscataway N J, 2004.


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