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Abstract

This paper presents the comparison results between two new generator configurations. These generator units are namely a field assisted switched reluctance generator (SRG) and a brushless dc (BLDC) generator. No permanent magnets are used in either unit. The field assisted SR generator consists of two magnetically dependent stator and rotor sets (layers), where each stator set includes twelve salient poles with windings wrapped around them, while the rotor comprises of eight salient poles without any winding or permanent magnet. There is a stationary reel, which has the field coil wrapped around it and is placed between the two-stator sets. The BLDC generator is also made up of two magnetically dependent stator and rotor sets, but each stator set includes nine salient poles with windings wrapped around them while, the rotor comprises of six salient poles without any windings or permanent magnets. There is also a stationary reel between the two layers to produce the magnetic field through the motor assembly. This magnetic field travels through a guide to the rotor then the stator and finally completes its path via the generator housing. The generator phase windings for each layer are connect such that all the stator poles in that set can have either north or south pole configuration while the stator poles in the other layer have the opposite pole arrangement. This type of connection can be used in motoring mode as well. To evaluate the performance of the generators, two types of analysis, namely, numerical technique and experimental study have been utilized. In the numerical analysis, three dimensional finite element analysis is employed, whereas in the experimental study, proto-types have been built and tested.

1. Schofield, N. and S. Long, "Generator operation of a switched reluctance starter/generator at extended speeds," IEEE Transactions on Vehicular Technology, Vol. 58, No. 1, 48-56, 2009.
doi:10.1109/TVT.2008.924981 Google Scholar

2. Lee, H., et al. "Practical control for improving power density and efficiency of the BLDC generator," IEEE Transactions on Power Electronics, Vol. 20, No. 1, 192-199, 2005.
doi:10.1109/TPEL.2004.839805 Google Scholar

3. Lee, H. W., T. H. Kim, and M. Ehsani, "Maximum power throughput in the multiphase brushless DC generator," IEE Proceedings Electric Power Applications, Vol. 152, No. 3, 501-508, 2005.
doi:10.1049/ip-epa:20045051 Google Scholar

4. Kim, T., H. W. Lee, and M. Ehsani, "Position sensorless brushless DC motor/generator drives: Review and future trends," IET Electric Power Applications, Vol. 1, No. 4, 557-564, 2007.
doi:10.1049/iet-epa:20060358 Google Scholar

5. Chen, H. C., T. Y. Tsai, and C. K. Huang, "Low-speed performance comparisons of back-EMF detection circuits with position-dependent load torque," IET Electric Power Applications, Vol. 3, No. 2, 160-169, 2009.
doi:10.1049/iet-epa:20080017 Google Scholar

6. Zhang, Z., Y. Yan, S. Yang, et al. "Development of a new permanent-magnet BLDC generator using 12-phase half-wave rectifier," IEEE Transactions on Industrial Electronics, Vol. 56, No. 6, 2023-2029, 2009.
doi:10.1109/TIE.2009.2016511 Google Scholar

7. Chen, H. and J. J. Gu, "Implementation of the three-phase switched reluctance machine system for motors and generators," IEEE Transactions on Mechatronics, Vol. 15, No. 3, 421-432, 2010.
doi:10.1109/TMECH.2009.2027901 Google Scholar

8. Torkaman, H. and E. Afjei, "FEM analysis of angular misalignment fault in SRM magnetostatic characteristics," Progress In Electromagnetics Research, Vol. 104, 31-48, 2010.
doi:10.2528/PIER10041406 Google Scholar

9. Afjei, E., A. Seyadatan, and H. Torkaman, "A new two phase bidirectional hybrid switched reluctance motor/field-assisted generator," Journal of Applied Sciences, Vol. 9, No. 4, 765-770, 2009.
doi:10.3923/jas.2009.765.770 Google Scholar

10. Ding, W. and D. Liang, "Dynamic modeling and control for a switched reluctance starter/generator system," International Conference on Electrical Machines and Systems, 3315-3320, 2008. Google Scholar

11. Ferreira, C. A., S. R. Jones, W. S. Heglund, et al. "Detailed design of a 30-kW switched reluctance starter/generator system for a gas turbine engine application," IEEE Transactions on Industry Applications, Vol. 31, No. 3, 553-561, 1995.
doi:10.1109/28.382116 Google Scholar

12. Echenique, E., J. Dixon, R. Cardenas, et al. "Sensorless control for a switched reluctance wind generator, based on current slopes and neural networks," IEEE Transaction on Industrial slopes and neural networks, Vol. 56, No. 3, 817-825, 2009. Google Scholar

13. Cardenas, R., R. Pena, M. Perez, et al. "Control of a switched reluctance generator for variable-speed wind energy applications," IEEE Transaction on Energy Conversion, Vol. 20, No. 4, 781-791, 2005.
doi:10.1109/TEC.2005.853733 Google Scholar

14. Fahimi, B., A. Emadi, R. B. Sepe, and Jr., "A switched reluctance machine-based starter/alternator for more electric cars," IEEE Transactions on Energy Conversion, Vol. 19, No. 1, 116-124, 2004.
doi:10.1109/TEC.2003.822322 Google Scholar

15. Afjei, E. and H. Torkaman, "The novel two phase field-assisted hybrid SRG: Magnetio static field analysis, simulation, and experimental confirmation," Progress In Electromagnetics Research B, Vol. 18, 25-42, 2009.
doi:10.2528/PIERB09082404 Google Scholar

16. Hanselman, D. C., Brushless Permanent Magnet Motor Design, McGraw-Hill, 1994.

17. Afjei, E. and H. Toliyat, "A novel hybrid brushless dc motor/generator for hybrid vehicles applications," International Conference on Power Electronics, Drives and Energy Systems, 1-6, 2006.
doi:10.1109/PEDES.2006.344366 Google Scholar

18. Ravaud, R., G. Lemarquand, V. Lemarquand, and C. Depollier, "The three exact components of the magnetic field created by a radially magnetized tile permanent magnet," Progress In Electromagnetics Research, Vol. 88, 307-319, 2008.
doi:10.2528/PIER08112708 Google Scholar

19. Ravaud, R., G. Lemarquand, V. Lemarquand, S. I. Babic, and C. Akyel, "Mutual inductance and force exerted between thick coils," Progress In Electromagnetics Research, Vol. 102, 367-380, 2010.
doi:10.2528/PIER10012806 Google Scholar

20. Ravaud, R., G. Lemarquand, V. Lemarquand, S. Babic, and C. Akyel, "Mutual inductance and force exerted between thick coils," Progress In Electromagnetics Research, Vol. 102, 367-380, 2010.
doi:10.2528/PIER10012806 Google Scholar

21. Torkaman, H. and E. Afjei, "Magnetio static field analysis regarding the effects of dynamic eccentricity in switched reluctance motor," Progress In Electromagnetics Research M, Vol. 8, 163-180, 2009.
doi:10.2528/PIERM09060205 Google Scholar

22. Torkaman, H. and E. Afjei, "Hybrid method of obtaining degrees of freedom for radial airgap length in SRM under normal and faulty conditions based on magnetiostatic model," Progress In Electromagnetics Research, Vol. 100, 37-54, 2010.
doi:10.2528/PIER09111108 Google Scholar

23. Magnet CAD package, , User Manual, Infolytica Corporation Ltd., 2007.

Prof. Hossein Torkaman

Prof. Seyed Ebrahim Afjei