本文旨在研製四相開關型磁阻電動機驅動系統，並著重於降低轉矩漣波之研究。開關型磁阻電動機採用定子8極、轉子6極之結構，文中以有限元素分析軟體(Ansoft Maxwell 2D)作磁路分析，找出適合兩相同時激磁之接線方式。功率轉換器方面使用兩相串聯型架構，使電動機操作於兩相同時激磁時，兩相繞組等效為串聯。開關型磁阻電動機驅動系統利用霍爾偵測元件回授之信號，配合12極磁環進行轉子角位置偵測及轉速回授，依此完成轉速閉迴路控制。
　　本文以16位元數位信號處理器dsPIC30F4011為控制核心，所有控制皆由軟體完成，可減少硬體成本，並增加系統可靠度。本系統之直流鏈輸入電壓為72V，轉速為500~1000rpm，轉矩為0.5 N-m。於轉速為1000rpm時轉矩漣波成分為28%，大幅改善了開關型磁阻電動機操作於單相激磁控制時之振動問題，驗證兩相同時激磁控制有效改善轉矩漣波。

　　This thesis presents the design of a four-phase switched reluctance motor drive system with special emphasis on the reduction of torque ripple. The switched reluctance motor consists of an 8-pole stator and a 6-pole rotor. Finite element analysis software, Ansoft Maxwell 2D, is used to analyze the magnetic circuit and find the suitable wiring under simultaneous two-phase excitation. Based on the analysis, two-phase series type dc-dc power converter is proposed to support the concurrent winding excitation. As to the motor drive system, Hall effect sensors are used to detect the required rotor positions and the rotational speed of the motor with 12-pole ring magnet. Finally, closed-loop speed control strategy is realized in accordance with the feedback signals.
　　In this thesis, a 16-bit digital signal processor, dsPIC30F4011, is adopted as the control core. The system is controlled by software for cost reduction and reliability enhancement. The input dc-bus voltage of the system is 72V. The rotational speed of the motor ranges from 500 to 1000 rpm. The corresponding torque is 0.50 N-m. At the speed of 1000rpm, the torque ripple component is 28%, which significantly improves the vibration as compared to switched reluctance motor operating under single-phase excitation. Analysis and experiments verify the proposed two-phase excitation control with torque ripple reduction.

[1] R. Krishnan and P. Materu, “Measurement and instrumentation of a switched reluctance motor,” IEEE Industry Applications Society Annual Meeting, vol. 1, pp. 116-121, 1989.
[2] 張家銘，開關式磁阻馬達的設計與特性分析，逢甲大學電機工程學研究所碩士論文，民國九十三年。
[3] R. M. Davis, “Variable reluctance rotor structures-their influence on torque production,” IEEE Transactions on Industrial Electronics, vol. 39, no. 2, pp. 168-174, 1992.
[4] M. Moallem, C. M. Ong and L. E. Unnewehr, “Effect of rotor profiles on the torque of a switch reluctance motor,” IEEE Industry Applications Society Annual Meeting, vol. 28, no. 2, pp. 247-253, 1990.
[5] H. C. Lovatt and J. M. Stephenson, “Influence of number of poles per phase in switched reluctance motors,” IEE Proceedings-Electric Power Applications, vol. 139, no. 4, pp. 307-314, 1992.
[6]R. Robinovici, “Scaling of switched reluctance motors,” IEE Proceedings-Electric Power Applications, vol. 142, no. 1, pp. 1-4, 1995.
[7]B. C. Mecrow, “New winding configurations for doubly salient reluctance machines,” IEEE Industry Applications Society Annual Meeting, vol. 32, no. 6, pp. 1348-1356, 1996.
[8] J. Li, H. X. Sun and Y. Liu ,“New rotor structure mitigating vibration and noise in switched reluctance motor,” International Conference on Information, Networking and Automation, vol. 2, pp.80 -84, 2010.
[9]J. M. Stephenson and M. A. El-Khazendar, “Saturation in doubly salient reluctance motors,” IEE Proceedings-Electric Power Applications, vol. 136, no. 1, pp. 50-58, 1989.
[10]A. M. Michaelides and C. Pollock, “Effect of end core flux on the performance of the switched reluctance motor,” IEE Proceedings-Electric Power Applications, vol. 141, no. 6, pp. 308-316, 1994.
[11]R. Krishnan, R. Arumugam and J. F. Lindsay, “Design procedure for switched-reluctance motors,” IEEE Transactions on Industry Applications, vol. 24, no. 3, pp. 456-461, 1988.
[12]R. Krishnan and R. A. Bedingfield, “Dynamic analysis of an SRM drive system,” IEEE Industry Applications Society Annual Meeting, vol. 1, pp. 265-271, 1991.
[13]G. E. Dawson, A. R. Eastham and J. Mizia, “Switched-reluctance motor torque characteristics ： finite-element analysis and test results,” IEEE Transactions on Industry Applications, vol. 23, no. 3, pp. 532-537, 1987.
[14]M. Ehsani, I. Husdin, K. R. Ramini and J. H. Galloway, “Dual-decay converter for switched reluctance motor drives in low-voltage applications,” IEEE Transactions on Power Electronics, vol. 8, no. 2, pp. 224-230, 1993.
[15]J. Kim, K. Ha and R. Krishnan “sigle-controllable-switch-based switched reluctance motor drive for low cost variable-speed applications,” IEEE Transactions on Power Electronics, vol. 27, no. 1, pp 379 - 387, 2012.
[16]C. Pollock and B. W. Williams, “A unipolar converter for a switched reluctance motor,” IEEE Transactions on Industry Applications, vol. 26, no. 2, pp. 222-228, 1990.
[17]M. Ehsani, I. Husdin, K. R. Ramini and J. H. Galloway, “Dual-decay converter for switched reluctance motor drives in low-voltage applications,” IEEE Transactions on Power Electronics, vol. 8, no. 2, pp. 224-230, 1993.
[18]R. Krishnan and P.N. Materu, “Design of a single-switched per-phase converter for switched reluctance motor drives,” IEEE Transactions on Industrial Electronics, vol. 37, no. 6, pp. 469-476, 1990.
[19]S. Chan and H. R. Bolton, “Performance enhancement of single phase switched-reluctance motor by dc link voltage boosting,” IEE Proceedings-Electric Power Applications, vol. 140. no. 5, pp. 912-921, 1997.
[20] M. Asgar, E. Afjei, A. Siadatan and Ali Zakerolhosseini, “A New modified asymmetric bridge drive circuit switched reluctance motor,” Circuit Theory and Design, 2009. ECCTD 2009. European Conference on, pp. 539 - 542, 2009.
[21]Z. Zhuo, P. Zhaoyu and F. Guojie, “Research on new control model for switched reluctance motor,” International Conference on Computer Application and System Modeling, vol. 5, pp. 198 -202, 2010.
[22]W. Mianhua, “Four phase switched reluctance motor direct torque control,” Third International Conference on Measuring Technology and Mechatronics Automation, vol. 2, pp. 251- 254, 2011.
[23]S. Bolognani and M. Zigliotto, “Fuzzy logic control of a switched reluctance motor drive,” IEEE Transactions on Industry Applications, vol. 32, no. 5, pp. 1063-1068, 1996.
[24]D. S. Reay, M. Mirkazemi-Moud, T. C. Green and B. W. Williams, “Switched reluctance motor control via fuzzy adaptive systems,” IEEE Control Systems Magazine, vol. 15, no. 3, pp. 8-15, 1995.
[25]H. C. Lovatt and J. M. Stephenson, “Computer-optimised current waveforms for switched-reluctance motors,” IEE Proceedings- Electric Power Applications, vol. 141, no. 2, pp. 45-51, 1994.
[26]I. Husain and M. Ehsani, “Torque ripple minimization in switched reluctance motor drives by PWM current control,” IEEE Transactions on Power Electronics, vol. 11, no. 1, pp. 83-88, 1996.
[27]R. S. Wallace and D. G. Taylor, “A balance commutator for switched reluctance motors to reduce torque ripple,” IEEE Transactions on Power Electronics, vol. 7, no. 4, pp. 617-626, 1992.
[28]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, 2012.
[29]N. Matsui, N. Akao and T. Wakino, “High-precision torque control of reluctance motors,” IEEE Transactions on Industry Applications, vol. 27, no. 5, pp. 902-907, 1991.
[30]A. M. Michaelides and C. Pollock, “Modeling and design of switched reluctance motors with two phases simultaneously excited,” IEE Proceedings- Electric Power Applications, vol. 143, no. 5, pp. 361-370, 1996.
[31]J. W. Moon, S. G. Oh, J. W. Ahn and Y. M. Hwang, “A three-phase switched reluctance motor with two-phase excitation,” IEEE Transactions on Industry Applications, vol. 35, no. 5, pp. 1067-1075, 1999.
[32]J. Li and H. Sun, “Modeling and simulation of four-phase 8/6 switched reluctance motor with an improved winding configuration,” 2008 International Conference 2008,on Computer Science and Software Engineering, vol. 4, pp. 1048-1048, 2008.
[33]R. Vandana, S. Nikam and B. G. Fernandes, “High torque polyphase segmented switched reluctance motor with novel excitation strategy,” IET on Electric Power Applications, vol. 6, no. 7, pp. 375-384, 2012.

[34]I. Husain and M. Ehsani, “Rotor position sensing in switched reluctance motor drives by measuring mutually induced voltages,” IEEE Transactions on Industry Applications, vol. 30, no. 3, pp. 665-672, 1994.
[35]X. Kai, Z. Qionghua and L. Jianwu, “A new simple sensorless control method for switched reluctance motor drives,” International Conference on Electrical Machines and Systems, vol. 1, pp. 594-598 , 2005.
[36]A. Lumsdaine and J. H. Lang, “State observers for variable reluctance motors,” IEEE Transactions on Industrial Electronics, vol. 37, no. 2, pp. 133-142, 1990.
[37]M. Ehsani and K. R. Ramini, “Direct control strategies based on sensing inductance in switched reluctance motors,” IEEE Transactions on Power Electronics, vol. 11, no. 1, pp. 74-82, 1996.
[38] 王順泰，數位控制之開關式磁阻馬達驅動系統研製，國立台灣科技大學電機工程學研究所碩士論文，民國九十一年。
[39] 柯柏年，單相昇壓型交流-直流功率轉換器之開關型磁阻電動機驅動系統研製，國立台灣科技大學電機工程學研究所碩士論文，民國九十 四年。
[40] 陳佑鳴，具電流控制之四相開關型磁阻電動機驅動系統研製，國立台灣科技大學電機工程學研究所碩士論文，民國一百零二年。