A Novel Transverse Flux Permanent Magnet Generator for Small-Scale Direct Drive Wind Turbine Application: Design and Analysis

Document Type : Article

Authors

1 Department of Electrical Engineering, K.N. Toosi University of Technology, Tehran, Iran

2 Electrical Machine Group, Niroo Research Institute (NRI), Tehran, Iran

Abstract

This study focuses on a special topology of Transvers Flux Permanent Magnet Generator which benefits from low PM cost due to using cheap Ferrite PMs. In this structure, only one PM per phase is used where leads to easy manufacturing process. In spite of the above mentioned advantages of the topology, there are some disadvantages such as unbalanced voltage, high demagnetisation risk of the PM, and high cogging torque. Aiming to solve these problems while maintaining the advantages of the topology, a new structure is proposed. The stator of this structure contains two series connected coils which eliminates all the even order harmonics and balances the voltage waveform. This trick reduces the armature reaction as well as demagnetisation of the PMs, significantly. Additionally, the rotor teeth of the proposed structure are skewed where leads to a noticeable reduction in cogging torque. The output results of the proposed structure are compared with the original one in terms of harmonic components, cogging torque profile, and PM demagnetisation.

Keywords

Main Subjects

References

References:
1. Gieras, J.F. "Permanent magnet motor technology: design and applications", pp. 364-401, CRC press, Florida, USA (2009).
2. Pourmoosa, A.A. and Mirsalim, M. "A transverse  flux generator with a single row of permanent magnets: Analytical design and performance evaluation", IEEE Transactions on Industrial Electronics, 66(1), pp. 152- 161 (2018).
3. Dobzhanskyi, O., Gouws, R., and Amiri, E. "Analysis of PM transverse-flux outer rotor machines with different configuration", IEEE Transactions on Industry Applications, 53(5), pp. 4260-4268 (2017).
4. Husain, T., Hasan, I., Sozer, Y., Husain, I., and Muljadi, E. "Design considerations of a transverse  flux machine for direct-drive wind turbine applications", IEEE Transactions on Industry Applications, 54(4), pp. 3604-3615 (2018).
5. McDonald, A. and Bhuiyan, N.A. "On the optimization of generators for offshore direct drive wind turbines", IEEE Transactions on Energy Conversion, 32(1), pp. 348-358 (2016).
6. Jia, Z., Lin, H., Fang, S., and Huang, Y. "Cogging torque optimization of novel transverse flux permanent magnet generator with double C-hoop stator", IEEE Transactions on Magnetics, 51(11), pp. 1-4 (2015).
7. Husain, T., Hasan, I., Sozer, Y., Husain, I., and Muljadi, E. "Cogging torque minimization in transverse  flux machines", IEEE Transactions on Industry Applications, 55(1), pp. 385-397 (2018).
8. Arand, S.J. and Ardebili, M. "Cogging torque reduction in axial- flux permanent magnet wind generators with yokeless and segmented armature by radially segmented and peripherally shifted magnet pieces", Renewable Energy, 99, pp. 95-106 (2016).
9. Vaz, J.R., Wood, D.H., Bhattacharjee, D., and Lins, E.F. "Drivetrain resistance and starting performance of a small wind turbine", Renewable Energy, 117, pp. 509-519 (2018).
10. Oh, J.H. and Kwon, B.I. "Design, optimization, and prototyping of a transverse  flux-type-switched reluctance generator with an integrated rotor", IEEE Transactions on Energy Conversion, 31(4), pp. 1521- 1529 (2016).
11. Ahsanullah, K., Dutta, R., and Rahman, M.F. "Analysis of low-speed IPMMs with distributed and fractional slot concentrated windings for wind energy applications", IEEE Transactions on Magnetics, 53(11), pp. 1-10 (2017).
12. Ueda, Y. and Takahashi, H. "Transverse- flux motor design with skewed and unequally distributed armature cores for reducing cogging torque", IEEE Transactions on Magnetics, 53(11), pp. 1-5 (2017).
13. Liu, C., Zhu, J., Wang, Y., Lei, G., and Guo, Y. "Cogging torque minimization of SMC PM transverse flux machines using shifted and unequal-width stator teeth", IEEE Transactions on Applied Superconductivity, 26(4), pp. 1-4 (2016).
14. Wang, Q., Zhao, B., Zhao, H., Li, Y., and Zou, J. "Optimal design of tubular transverse  flux motors with low cogging forces for direct drive applications", IEEE Transactions on Applied Superconductivity, 26(7), pp. 1-5 (2016).
15. Washington, J.G., Atkinson, G.J., and Baker, N.J. "Reduction of cogging torque and EMF harmonics in modulated pole machines", IEEE Transactions on Energy Conversion, 31(2), pp. 759-768 (2016).
16. Nasiri-Zarandi, R., Ghaheri, A., and Abbaszadeh, K."Cogging torque reduction in U-core TFPM generator using different halbach-array structures", In 2018 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM), Amalfi Coast, Italy, pp. 1153-1158 (2018).
17. Green, J. "Development of high-performance generator for wind turbines", Final Report, Stage II, National Wind Technology Center, Boulder, USA (2009).
18. Gieras, J.F., Hamilton Sundstrand Corp. "Transverse flux machine", U.S. Patent 7,830,057 (2010).
19. Kastinger, G. "August. Design of a novel transverse flux machine", In Proc. ICEM, Brugge, Belgium (2002).
20. Liu, C., Lei, G., Ma, B., Wang, Y., Guo, Y., and Zhu, J. "Development of a new low-cost 3-D flux transverse flux FSPMM with soft magnetic composite cores and ferrite magnets", IEEE Transactions on Magnetics, 53(11), pp. 1-5 (2017).
21. Husain, T., Hasan, I., Sozer, Y., Husain, I., and Muljadi, E. "Design of a modular E-core flux concentrating transverse flux machine", IEEE Transactions on Industry Applications, 54(3), pp. 2115-2128 (2018).
22. Bastawade, P., Chaudhari, B.N., Ugale, R.T., and Pramanik, A. "Analytical and FEA based analysis of homopolar poly-phase transverse flux machine", In 2016 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES), Trivandrum, India, pp. 1-6 (2016).
23. Liu, G., Shao, M., Zhao, W., Chen, Q., and Mo, L. "Cost reduction of a new fault-tolerant Halbach permanent magnet machine using ferrite magnet", IEEE Transactions on Magnetics, 50(11), pp. 1-4 (2014).
24. Zhao, X. and Niu, S. "Design of a novel consequentpole transverse- flux machine with improved permanent magnet utilization", IEEE Transactions on Magnetics, 53(11), pp. 1-5 (2017).
25. Ahmed, A., Wan, Z., and Husain, I. "Permanent magnet transverse flux machine with overlapping stator poles", In 2015 IEEE Energy Conversion Congress and Exposition (ECCE), Montreal, Canada, pp. 791-798 (2015).
26. Oskarsdottir, M. O. "A general description and comparison of horizontal axis wind turbines and vertical axis wind turbines", Doctoral Dissertation, School of Engineering and Natural Sciences, University of Iceland, Iceland, pp. 130-365 (2014).
27. Nasiri-Zarandi, R., Ajamloo, A.M., and Abbaszadeh, K. "Proposing the output equations and 3-D MEC modeling for U-Core TFPM generators", In 2018 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM), Amalfi Coast, Italy, pp. 292-297 (2018).
28. Anglada, J.R. and Sharkh, S.M. "Analytical calculation of the torque produced by transverse flux machines", IET Electric Power Applications, 11(7), pp. 1298-1305 (2017).
29. Anglada, J.R. and Sharkh, S.M. "Analysis of transverse flux machines using a virtual mutual inductance approach", IEEE Transactions on Energy Conversion, 33(2), pp. 465-472 (2017).
30. Alam, F.R. and Abbaszadeh, K. "Magnetic field analysis in eccentric surface-mounted permanentmagnet motors using an improved conformal mapping method", IEEE Transactions on Energy Conversion, 31(1), pp. 333-344 (2015).
31. Ostovic, V., Dynamics of Saturated Electric Machines, pp. 112-368, Springer Science & Business Media, Berlin, Germany (2012).
32. Sudhoff, S.D., Power Magnetic Devices: A Multi-Objective Design Approach, John Wiley & Sons, New Jersey, USA, pp. 264-355 (2014).
33. Ojaghlu, P., Vahedi, A., and Totoonchian, F. "Magnetic equivalent circuit modelling of ring winding axial  flux machine", IET Electric Power Applications, 12(3), pp. 293-300 (2017).
34. Tong, W., Wang, S., Dai, S., Wu, S., and Tang, R. "A quasi-three-dimensional magnetic equivalent circuit model of a double-sided axial flux permanent magnet machine considering local saturation", IEEE Transactions on Energy Conversion, 33(4), pp. 2163- 2173 (2018).
35. Horvath, D.C., Pekarek, S.D., and Sudhoff, S.D. "A scaled mesh/nodal formulation of magnetic equivalent circuits with motion", IEEE Transactions on Energy Conversion, 34(1), pp. 58-69 (2018).
36. Mignot, R.B., Espanet, C., Chamagne, D., and Martin, T. "Modeling of an axial flux pm motor using a 3D magnetic equivalent circuit", In 2014 IEEE Vehicle Power and Propulsion Conference (VPPC), Coimbra, Portugal, pp. 1-9 (2014).
37. Johnson, M., Gardner, M.C., and Toliyat, H.A. "A parameterized linear magnetic equivalent circuit for analysis and design of radial flux magnetic gears-Part I: Implementation", IEEE Transactions on Energy Conversion, 33(2), pp. 784-791 (2017).
38. Hasan, I., Husain, T., Sozer, Y., Husain, I., and Muljadi, E. "Analytical modeling of a double-sided flux concentrating E-core transverse  flux machine with pole windings", In 2017 IEEE International Electric Machines and Drives Conference (IEMDC), Miami, USA, pp. 1-7 (2017).
39. Hasan, I., Husain, T., Uddin, M.W., Sozer, Y., Husain, I., and Muljadi, E. "Analytical modeling of a novel transverse flux machine for direct drive wind turbine applications", In 2015 IEEE Energy Conversion Congress and Exposition (ECCE), Montreal, Canada, pp. 2161-2168 (2015).
Scientia Iranica
Volume 28, Issue 6 - Serial Number 6
Transactions on Computer Science & Engineering and Electrical Engineering (D)
November and December 2021
Pages 3363-3378

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