Modelling and Parameters Identification of Through-Hole Type Wind Turbine Contactless Sliprings


This paper presents a modelling and parameter identification of through-hole type contactless slipring systems for transferring electrical power for wind turbine pitch control. An equivalent circuit model has been developed from the physical structure and dimensions of the contactless slipring using the duality rules, which is very different form traditional transformer. The circuit inductances are determined by the derived expressions from the system reluctances. In particular, the equivalent resistance representing the core loss of the slipring has been determined using phasor diagram of exciting current. FEM (Finite Element Method) models and practical prototypes are developed for testing and verifycations. Both simulation and experimental results have shown that the developed model gives truthful values for numerical calculations in order to obtain the equivalent electric circuit. The effect of fringing flux around the air gap on mutual inductance and the ways of correcting its effects are analysed. The obtained values have shown that the developed models and derived equations are with high accuracy as compared to the FEM simulation and experimental results.

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A. Abdolkhani, A. Hu and N. Nair, "Modelling and Parameters Identification of Through-Hole Type Wind Turbine Contactless Sliprings," Engineering, Vol. 4 No. 5, 2012, pp. 272-283. doi: 10.4236/eng.2012.45036.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] G. Gao and W. Chen, “Design Challenges of Wind Turbine Generators,” IEEE Electrical Insulation Conference, 31 May-3 June 2009, pp. 146-152. doi:10.1109/EIC.2009.5166334
[2] S. H. Marx, “A Kilowatt Rotary Power Transformer,” IEEE Transactions on Aerospace and Electronic Systems, Vol. AES-7, No. 6, 1971, pp. 1157-1163. doi:10.1109/TAES.1971.310219
[3] D. A. G. Pedder, et al., “A Contactless Electrical Energy Transmission System,” IEEE Transactions on Industrial Electronics, Vol. 46, No. 1, 2002, pp. 23-30. doi:10.1109/41.744372
[4] B. Potter and S. Shirsavar, “Design, Implementation and Characterisation of a Contactless Power Transfer System for Rotating Applications,” 32nd Annual Conference on IEEE Industrial Electronics, IECON 2006, 6-10 November 2006, pp. 2168-2173.
[5] A. P. Hu, “Selected Resonant Converters for IPT Power Supplies,” PhD Thesis, University of Auckland, Auckland, 2001.
[6] A. Abdolkhani and A. Hu, “A Sandwiched Magnetic Coupling Structure for Contactless Slipring Applications,” International Geoinformatics Research and Development, Vol. 2, No. 3, 2011, 8 Pages.
[7] A. Abdolkhani and A. P. Hu, “A Novel Detached Magnetic Coupling Structure for Contactless Power Transfer,” IECON 2011—37th Annual Conference on IEEE Industrial Electronics Society, Melbourne, 7-10 November 2011, pp. 1103-1108.
[8] K. D. Papastergiou and D. E. Macpherson, “An Airborne Radar Power Supply with Contactless Transfer of Energy— Part I: Rotating Transformer,” IEEE Transactions on Industrial Electronics, Vol. 54, No. 5, 2007, pp. 2874-2884. doi:10.1109/TIE.2007.902044
[9] C. W. T. McLyman, “Transformer and Inductor Design Handbook,” Vol. 121, CRC Press, New York, 2004. doi:10.1201/9780203913598
[10] E. C. Cherry, “The Duality between Interlinked Electric and Magnetic Circuits and the Formation of Transformer Equivalent Circuits,” Proceedings of the Physical Society. Section B, Vol. 62, No. 2, 1949, p. 101. doi:10.1088/0370-1301/62/2/303
[11] N. Mohan and T. M. Undeland, “Power Electronics: Converters, Applications, and Design,” Wiley, India, 2007.
[12] K. Cheng and P. Evans, “Calculation of Winding Losses in High Frequency Toroidal Inductors Using Multistrand Conductors,” IEE Proceedings of Electric Power Applications, Vol. 142, No. 5, 1995, pp. 313-322. doi:10.1049/ip-epa:19952041
[13] K. Cheng, “Computation of the AC Resistance of Multistranded Conductor Inductors with Multilayers for High Frequency Switching Converters,” IEEE Transactions on Magnetics, Vol. 36, No. 4, 2000, pp. 831-834. doi:10.1109/20.877573
[14] W. G. Hurley, et al., “Optimizing the ac Resistance of multilayer Transformer Windings with Arbitrary Current Waveforms,” IEEE Transactions on Power Electronics, Vol. 15, No. 2, 2000, pp. 369-376. doi:10.1109/63.838110

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