Comparative study of torque ripple minimization techniques for a three-phase switched reluctance motor

de Paula, M. V., Barros, T. A. S., Santos Neto, P. J. , de Souza, R. R., and Ruppert Filho, E.



Switched reluctance machines (SRM) raise advantages such as ruggedness, simplicity and fault tolerance, which highlights these machines among other topologies for variable speed applications. However, inherent drawbacks as high torque ripple and acoustic noise occur, both caused by the doubly salient structure and drive principle. This paper presents an investigation regarding SRMs torque ripple mitigation. The principles of SRM are addressed to explain the torque ripple presence. Then, instantaneous torque control (ITC) techniques, such as common torque sharing functions (TSF), direct instantaneous torque control (DITC) and direct torque control (DTC) are discussed and compared. Simulations are performed to verify the control algorithms. The simulated system consists of a control block containing the control algorithm of one aforementioned technique, an asymmetric half bridge (AHB), an 80 V power supply, and an 1,5 kW, 12/8 SRM. Simulations convey that, among the TSFs, the sinusoidal TSF arise lower torque ripple. After that, the sinusoidal TSF was compared to the other methods, in this case, sinusoidal TSF produced minor torque ripple from 0 to 1000 rpm and for higher speeds, DITC presented smaller torque ripple. It is possible to conclude that TSF is recommended for low speed applications, while DITC is suggested for higher speed applications.

Published in: Renewable Energy & Power Quality Journal (RE&PQJ, Nº. 16)
Pages: 270-275 Date of Publication: 2018/04/20
ISSN: 2172-038X Date of Current Version:2018/03/23
REF: 280-18 Issue Date: April 2018
DOI:10.24084/repqj16.280 Publisher: EA4EPQ

Authors and affiliations

de Paula, M. V.1, Barros, T. A. S.1, Santos Neto, P. J. 1, de Souza, R. R. 1, and Ruppert Filho, E. 1
1 Faculty of Electrical and Computer Engineering, University of Campinas. Campus of Campinas – Campinas (Brazil)

Key words

Switched Reluctance Motor, Torque Ripple Reduction, Direct Torque Control, Direct Instantaneous Torque Control, Torque Sharing Function, Instantaneous Torque Control.


[1] M. Krishnamurthy, C. S. Edrington, A. Emadi, P. Asadi, M. Ehsani, and B. Fahimi, “Making the case for applications of switched reluctance motor technology in automotive products,” IEEE Transactions on Power Electronics, vol. 21, no. 3, pp. 659–675, May 2006.
[2] Gan, J. Wu, S. Yang, and Y. Hu, “Phase current reconstruction of switched reluctance motors from dc-link current under double high-frequency pulses injection,” IEEE Transactions on Industrial Electronics, vol. 62, no. 5, pp. 3265–3276, May 2015.
[3] R. Mikail, Y. Sozer, I. Husain, M. Islam, and T. Sebastian, “Torque ripple minimization of switched reluctance machines through current profiling,” in 2011 IEEE Energy Conversion Congress and Exposition, Sept 2011, pp. 3568–3574.
[4] R. Mikail, I. Husain, M. S. Islam, Y. Sozer, and T. Sebastian, “Four quadrant torque ripple minimization of switched reluctance machine through current profiling with mitigation of rotor eccentricity problem and sensor errors,” IEEE Transactions on Industry Applications, vol. 51, no. 3, pp. 2097–2104, May 2015.
[5] Y. Guo, Q. Ma, and W. Ye, “Comparative study on torque ripple suppression method of three-phase 6/4 switched reluctance motor,” in 2016 IEEE International Conference on Aircraft Utility Systems (AUS), Oct 2016, pp. 356–361.
[6] Ye, B. Bilgin, and A. Emadi, “An extended-speed low-ripple torque control of switched reluctance motor drives,” IEEE Transactions on Power Electronics, vol. 30, no. 3, pp. 1457–1470, March 2015.
[7] ——, “An offline torque sharing function for torque ripple reduction in switched reluctance motor drives,” IEEE Transactions on Energy Conversion, vol. 30, no. 2, pp. 726–735, June 2015.
[8] V. Petrus, A. C. Pop, C. S. Martis, V. Iancu, and J. Gyselinck, “Direct instantaneous torque control of srms versus current profiling - comparison regarding torque ripple and copper losses,” in 2012 13th International Conference on Optimization of Electrical and Electronic Equipment (OPTIM), May 2012, pp. 366–372.
[9] V. P. Vujicic, “Minimization of torque ripple and copper losses in switched reluctance drive,” IEEE Transactions on Power Electronics, vol. 27, no. 1, pp. 388–399, Jan 2012.
[10] X. D. Xue, K. W. E. Cheng, and S. L. Ho, “Optimization and evaluation of torque-sharing functions for torque ripple minimization in switched reluctance motor drives,” IEEE Transactions on Power Electronics, vol. 24, no. 9, pp. 2076–2090, Sept 2009.
[11] K. Russa, I. Husain, and M. E. Elbuluk, “Torque-ripple minimization in switched reluctance machines over a wide speed range,” IEEE Transactions on Industry Applications, vol. 34, no. 5, pp. 1105–1112, Sept 1998.
[12] S. Kurian and N. G. K., “Torque ripple minimization of srm using torque sharing function and hysteresis current controller,” in 2015 International Conference on Control Communication Computing India (ICCC), Nov 2015, pp. 149–154.
[13] Husain, “Minimization of torque ripple in srm drives,” IEEE Transactions on Industrial Electronics, vol. 49, no. 1, pp. 28–39, Feb 2002.
[14] R. B. Inderka and R. W. A. A. D. Doncker, “Ditc-direct instantaneous torque control of switched reluctance drives,” IEEE Transactions on Industry Applications, vol. 39, no. 4, pp. 1046–1051, July 2003.
[15] Y. Sozer, I. Husain, and D. A. Torrey, “Guidance in selecting advanced control techniques for switched reluctance machine drives in emerging applications,” IEEE Transactions on Industry Applications, vol. 51, no. 6, pp. 4505–4514, Nov 2015.
[16] X. Zhao, A. Xu and W. Zhang, "Research on DTC system with variable flux for switched reluctance motor," in CES Transactions on Electrical Machines and Systems, vol. 1, no. 2, pp. 199-206, 2017.
[17] Guiying Song, Zhida Li, Zhenghan Zhao and Xiang Wang, "Direct torque control of switched reluctance motors," 2008 International Conference on Electrical Machines and Systems, Wuhan, 2008, pp. 3389-3392.
[18] A. D. Cheok and Y. Fukuda, "A new torque and flux control method for switched reluctance motor drives," in IEEE Transactions on Power Electronics, vol. 17, no. 4, pp. 543-557, Jul 2002.
[19] N. H. Fuengwarodsakul, M. Menne, R. B. Inderka, and R. W. D. Doncker, “High-dynamic four-quadrant switched reluctance drive based on ditc,” IEEE Transactions on Industry Applications, vol. 41, no. 5, pp. 1232–1242, Sept 2005.
[20] H. Zeng, H. Chen, and J. Shi, “Direct instantaneous torque control with wide operating range for switched reluctance motors,” IET Electric Power Applications, vol. 9, no. 9, pp. 578–585, 2015.
[21] T. A. S. Barros, P. S. Nascimento Fo, A. B. Moreira, V. S. C. Teixeira, M. G. Villalva, and E. Ruppert, “Sistema automático de caracterização de maquinas de relutância variável e modelagem não linear por interpolação utilizando smoothing splines. ” Eletrônica de Potência, vol. 20, pp. 140-150, 2015.