Sensitivity Analysis of External-Rotor Permanent Magnet Assisted Synchronous Reluctance Motor
In this paper, a proper approach is taken to assess a set of the most effective rotor design parameters for an external-rotor permanent magnet assisted synchronous reluctance motor (PMaSynRM) and therefore to tackle the design complexity of the rotor structure. There are different advantages for introducing permanent magnets into the rotor flux barriers, some of which are to saturate the rotor iron ribs, to increase the motor torque density and to improve the power factor. Moreover, the d-axis and q-axis inductances are of great importance to simultaneously achieve maximum developed torque and low torque ripple. Therefore, sensitivity analysis of the rotor geometry of an 8-pole external-rotor permanent magnet assisted synchronous reluctance motor is performed. Several magnetically accurate finite element analyses (FEA) are conducted to characterize the electromagnetic performance of the motor. The analyses validate torque and power factor equations for the proposed external-rotor motor. Based upon the obtained results and due to an additional term, permanent magnet torque, added to the reluctance torque, the electromagnetic torque of the PMaSynRM increases.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1317186Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 403
 J. K. Kostko, “Polyphase reaction synchronous motors,” J. Am. Inst. Electr. Eng., vol. 42, no. 11, pp. 1162–1168, 1923.
 S. S. R. Bonthu, A. Arafat, and S. Choi, “Comparisons of Rare-Earth and Rare-Earth Free External Rotor Permanent Magnet Assisted Synchronous Reluctance Motors,” IEEE Trans. Ind. Electron., vol. 46, no. 330, pp. 1–1, 2017.
 L. Jian, K. T. Chau, and J. Z. Jiang, “A Magnetic-Geared Outer-Rotor Permanent-Magnet Brushless Machine for Wind Power Generation,” IEEE Trans. Ind. Appl., vol. 45, no. 3, pp. 954–962, 2009.
 H. Chen and J. J. Gu, “Switched reluctance motor drive with external rotor for fan in air conditioner,” IEEE/ASME Trans. Mechatronics, vol. 18, no. 5, pp. 1448–1458, 2013.
 P. J. Holik, D. G. Dorrell, and M. Popescu, “Performance improvement of an external-rotor split-phase induction motor for low-cost drive applications using external rotor can,” IEEE Trans. Magn., vol. 43, no. 6, pp. 2549–2551, 2007.
 S. S. R. Bonthu, S. Choi, A. Gorgani, and K. Jang, “Design of permanent magnet assisted synchronous reluctance motor with external rotor architecture,” in Proceedings - 2015 IEEE International Electric Machines and Drives Conference, IEMDC 2015, 2016, pp. 220–226.
 R. A. Inte and F. N. Jurca, “A novel synchronous reluctance motor with outer rotor for an electric bike,” in Proceedings of the 2016 International Conference and Exposition on Electrical and Power Engineering, EPE 2016, 2016, no. Epe, pp. 213–218.
 Y. Deshpande and H. A. Toliyat, “Design of an outer rotor ferrite assisted synchronous reluctance machine (Fa-SynRM) for electric two wheeler application,” in 2014 IEEE Energy Conversion Congress and Exposition, ECCE 2014, 2014, pp. 3147–3154.
 S. S. R. Bonthu and S. Choi, “Design procedure for multi-phase external rotor permanent magnet assisted synchronous reluctance machines,” in Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC, 2016, vol. 2016–May, pp. 1131–1137.
 M. Z. Islam, S. S. R. Bonthu, and S. Choi, “Obtaining optimized designs of multi-phase PMa-SynRM using lumped parameter model based optimizer,” Proc. - 2015 IEEE Int. Electr. Mach. Drives Conf. IEMDC 2015, pp. 1722–1728, 2016.
 M. Azhagar Raj and A. Kavitha, “Effect of Rotor Geometry on Peak and Average Torque of External Rotor Synchronous Reluctance Motor (Ex-R SynRM) in comparison with Switched Reluctance Motor for Low Speed Direct Drive Domestic Application,” IEEE Trans. Magn., vol. 9464, no. c, pp. 1–1, 2017.
 R. R. Moghaddam and F. Gyllensten, “Novel high-performance SynRM design method: An easy approach for a complicated rotor topology,” IEEE Trans. Ind. Electron., vol. 61, no. 9, pp. 5058–5065, 2014.
 A. Vagati, M. Pastorelli, G. Franceschini, and S. C. Petrache, “Design Of Low-torque-ripple Synchronous Reluctance Motors - Industry Applications, IEEE Transactions on,” vol. 34, no. 4, pp. 758–765, 1998.
 A. Vagati, “Synchronous Reluctance Electrical Motor having a low torque ripple design”, USA patent No. 5,818,140, Oct. 6, 1998.