Reduction of Torque Ripples and Radial Force in Segmental SRM Using Current Profiling Method

Subject Areas : Power Engineering

Milad Allaei ¹ (Department of Electrical Engineering, Khomeinishahr Branch, Islamic Azad University, Isfahan, Iran)
Milad Dowlatshahi ² (Department of Electrical Engineering, Khomeinishahr Branch, Islamic Azad University, Isfahan, Iran)
Sayed Morteza Saghaian-Nejad ³ (Department of Electrical and Computer Engineering, Isfahan University of Technology, Isfahan, Iran)

Received: 2022-04-03 Accepted : 2022-07-24 Published : 2022-11-22

Keywords: torque ripple reduction, Switched reluctance motor (SRM), Segmental switched reluctance motor, Linear torque sharing function,

Abstract :

The torque of the reluctance switch motors is created from the sum of its discrete values, the purpose of which is to create a continuous torque on the motor shaft, causing a phenomenon called torque ripple in the commutation regions. In this paper, in order to reduce the radial force and stabilize the torque, the design of a reluctance switch motor with a discrete rotor structure is simulated using Magnet software. For this purpose, first by examining the radial force acting on the rotor in different currents and situations from the area unaligned to aligned, a function called radial force function is introduced. Then, using the introduced function and the torque-current relationship, the phase reference torque is introduced so that the sum of the torque moments is equal to the reference torque of the motor. For experimental purposes, using Matlab software, the motor circuit and its drive are simulated, and by applying the torque function introduced as the reference torque, the results are compared with the results of the linear torque common function. And the simultaneous representation of the figure of the two radial forces obtained shows that the motor torque ripple is reduced and is almost the same as the torque in the linear common state. This is in a situation where the radial force decreases relative to the radial force of the linear joint torque.

References:

[1] S. K. Sahoo, S. Dasgupta, S. K. Panda and J. -X. Xu, “A Lyapunov Function-Based Robust Direct Torque Controller for a Switched Reluctance Motor Drive System,” IEEE Transactions on Power Electronics, vol. 27, no. 2, pp. 555-564, Feb. 2012, doi: 10.1109/TPEL.2011.2132740.

[2] A. D. Callegaro, B. Bilgin and A. Emadi, “Radial Force Shaping for Acoustic Noise Reduction in Switched Reluctance Machines,” IEEE Transactions on Power Electronics, vol. 34, no. 10, pp. 9866-9878, Oct. 2019, doi: 10.1109/TPEL.2019.2891050

[3] Sh. Wang, Q. Zhan, Z. Ma and L. Zhou, “Implementation of a 50-kW four-phase switched reluctance motor drive system for hybrid electric vehicle,” IEEE Transactions on Magnetics, vol. 41, no. 1, pp. 501-504, Jan. 2005, doi: 10.1109/TMAG.2004.838985.

[4] A. V. Radun, “High-power density switched reluctance motor drive for aerospace applications,” IEEE Transactions on Industry Applications, vol. 28, no. 1, pp. 113-119, Jan.-Feb. 1992, doi: 10.1109/28.120219.

[5] J. Furqani, M. Kawa, C. A. Wiguna, N. Kawata, K. Kiyota and A. Chiba, “Current Reference Selection for Acoustic Noise Reduction in Two Switched Reluctance Motors by Flattening Radial Force Sum,” IEEE Transactions on Industry Applications, vol. 55, no. 4, pp. 3617-3629, July-Aug. 2019, doi: 10.1109/TIA.2019.2910497.

[6] V. P. Vujičić, “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, doi: 10.1109/TPEL.2011.2158447.

[7] R. (Ramu) Krishnan, Switched reluctance motor drives : modeling, simulation, analysis, design, and applications. CRC Press, 2001. Accessed: Jul. 24, 2022.

[8] H. J. Zhang, C. Gao and S. H. Wang, “Analysis of radial force for switched reluctance motor,” 2013 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, 2013, pp. 418-419, doi: 10.1109/ASEMD.2013.6780809.

[9] X. Deng and B. Mecrow, “A comparison of conventional and segmental rotor 12/10 switched reluctance motors,” 2019 IEEE International Electric Machines & Drives Conference (IEMDC), 2019, pp. 1508-1513, doi: 10.1109/IEMDC.2019.8785221.

[10] V. Hanaeinejad and M. Abbasian, “A Non-segmental Outer Rotor Switched Reluctance Machine for In-Wheel Electric Vehicle Application,” Iranian Journal of Science and Technology - Transactions of Electrical Engineering, vol. 43, no. 4, pp. 909–918, Dec. 2019, doi: 10.1007/S40998-019-00192-9.

[11] B. Bilgin, A. Emadi and M. Krishnamurthy, “Design Considerations for Switched Reluctance Machines with a Higher Number of Rotor Poles,” IEEE Transactions on Industrial Electronics, vol. 59, no. 10, pp. 3745-3756, Oct. 2012, doi: 10.1109/TIE.2011.2141102.

[12] P. C. Desai, M. Krishnamurthy, N. Schofield and A. Emadi, “Novel Switched Reluctance Machine Configuration with Higher Number of Rotor Poles Than Stator Poles: Concept to Implementation,” IEEE Transactions on Industrial Electronics, vol. 57, no. 2, pp. 649-659, Feb. 2010, doi: 10.1109/TIE.2009.2034678.

[13] Ch. Choi, S. Kim, Y. Kim and K. Park, “A new torque control method of a switched reluctance motor using a torque-sharing function,” IEEE Transactions on Magnetics, vol. 38, no. 5, pp. 3288-3290, Sept. 2002, doi: 10.1109/TMAG.2002.802295.

[14] A. Jin-U, “Copper Loss and Torque Ripple Minimization in Switched Reluctance Motors Considering Nonlinear and Magnetic Saturation Effects,” Journal of Power Electronics, vol. 14, no. 2, pp. 351–361, Mar. 2014.

[15] J. Ye, B. Bilgin and A. Emadi, “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, doi: 10.1109/TEC.2014.2383991.