[1]

Da Costa JP, Pinheiro H, Degner T and Arnold G (2010) Robust controller for DFIGs of grid-connected wind turbines. IEEE Transactions on Industrial Electronics 58, 4023–4038.

[2]

Gao G and Chen W (2009). Design challenges of wind turbine generators. In 2009 IEEE Electrical Insulation Conference, IEEE, pp. 146–152.

[3]

Hall RD and Roberge RP (2010) Carbon brush performance on slip rings. In Conference Record of 2010 Annual Pulp & Paper Industry Technical Conference, IEEE, pp. 1–6.

[4]

IEEE (1975) IEEE standard test procedure for carbon brushes, IEEE Standard 116.

[5]

Hurst C (2010) China's rare earth elements industry: What can the west learn?. Institute for the Analysis of Global Security Washington DC.

[6]

Ludois DC and Brown I (2017) Brushless and permanent magnet free wound field synchronous motors for EV traction (No. DOE-Wisconsin-6849). University of Wisconsin-Madison, Madison, WI (United States), Final Report 3/31/2017.

[7]

Chakraborty C, Basak S and Rao YT (2017) A new series of brushless and permanent magnetless synchronous machines. In 2017 IEEE 26th International Symposium on Industrial Electronics (ISIE), IEEE, pp. 1425–1430.

[8]

Landsman EE (1970) Rotary transformer design. In 1970 IEEE Power Electronics Specialists Conference, IEEE, pp. 139–152.

[9]

Papastergiou KD and Macpherson DE (2007) An airborne radar power supply with contactless transfer of energy – Part Ⅰ: rotating transformer. IEEE Transactions on Industrial Electronics 54(5), 2874–2884.

doi: 10.1109/TIE.2007.902044
[10]

Papastergiou KD and Macpherson DE (2007) An airborne radar power supply with contactless transfer of energy – Part Ⅱ: converter design. IEEE Transactions on Industrial Electronics 54(5), 2885–2893.

doi: 10.1109/TIE.2007.901370
[11]

Legranger J, Friedrich G, Vivier S and Mipo JC (2007) Comparison of two optimal rotary transformer designs for highly constrained applications. In 2007 IEEE International Electric Machines & Drives Conference, vol. 2, IEEE, pp. 1546–1551.

[12]

Tartibi M and Domijan A (1996) Optimizing ac-exciter design. IEEE Transactions on Energy Conversion 11(1), 16–24.

doi: 10.1109/60.486571
[13]

Gomes DR and Chabu IE (2010) Studies on electrical stresses in rotating rectifiers for brushless exciters. In 2010 9th IEEE/IAS International Conference on Industry Applications-INDUSCON 2010, IEEE, pp. 1–6.

[14]

Dillman TL, Skooglund JW, Keay FW, South WH and Raczkowski C (1971) A high initial response brushless excitation system. IEEE Transactions on Power Apparatus and Systems PAS-90(5), 2089–2094.

doi: 10.1109/TPAS.1971.293025
[15]

Allen GFH (1975) Brushless excitation systems for synchronous machines. Electronics and Power 21(15), 866–869.

doi: 10.1049/ep.1975.0905
[16]

Veszpremi K (2004) Comprehensive optimization of brushless excitation of synchronous machine. In 30th Annual Conference of IEEE Industrial Electronics Society, 2004. IECON 2004, vol. 2, IEEE, pp. 1327–1332.

[17]

IEEE (2007) IEEE standard definitions for excitation systems for synchronous machines, IEEE Standard 421.1.

[18]

Wrobel R, Griffo A, Mlot A, Yon J, Mellor P, Turner J and Collins R (2011) Design study of a three-phase brushless exciter for aircraft starter/generator. In 2011 IEEE Energy Conversion Congress and Exposition, IEEE, pp. 3998–4004.

[19]

Marx SH and Bounds RW (1971) A kilowatt rotary power transformer. IEEE Transactions on Aerospace and Electronic Systems AES-7(6), 1157–1163.

doi: 10.1109/TAES.1971.310219
[20]

Papastergiou KD, Macpherson DE and Fisher F (2005) A 1 kW phaseshifted full bridge converter incorporating contact-less transfer of energy. In 2005 IEEE 36th Power Electronics Specialists Conference, IEEE, pp. 83–89.

[21]

Jun LC, Ming Q and Bin ZJ (2008) Modeling and test of contactless transformer used in inductosyn. In 2008 International Conference on Electrical Machines and Systems, IEEE, pp. 4323–4327.

[22]

Smeets JPC, Encica L and Lomonova EA (2010) Comparison of winding topologies in a pot core rotating transformer. In 2010 12th International Conference on Optimization of Electrical and Electronic Equipment, IEEE, pp. 103–110.

[23]

Moradewicz AJ and Kazmierkowski MP (2009) High efficiency contactless energy transfer system with power electronic resonant converter. Bulletin of the Polish Academy of Sciences: Technical Sciences 57(4), 375–381.

doi: 10.2478/v10175-010-0141-0
[24]

Abdolkhani A and Hu AP (2011) A novel detached magnetic coupling structure for contactless power transfer. In IECON 2011–37th Annual Conference of the IEEE Industrial Electronics Society, IEEE, pp. 1103–1108.

[25]

Abdolkhani A and Hu A (2011) A sandwiched magnetic coupling structure for contactless slipring applications. International Geoinformatics Research and Development 2, 8.

[26]

Colonel W, McLyman T and Landsman E (2011) Rotary transformer design, pp. 19.1–19.10.

[27]

Potter BA and Shirsavar SA (2006) Design, implementation and characterisation of a contactless power transfer system for rotating applications. In IECON 2006-32nd Annual Conference on IEEE Industrial Electronics, IEEE, pp. 2168–2173.

[28]

Pedder DA, Brown AD and Skinner JA (1999) A contactless electrical energy transmission system. IEEE Transactions on Industrial Electronics 46, 23–30.

doi: 10.1109/41.744372
[29]

Hu AP (2001) Selected Resonant Converters for IPT Power Supplies (Doctoral dissertation). ResearchSpace@ Auckland.

[30]

Lu M, Bagheri M, James AP and Phung T (2018) Wireless charging techniques for UAVs: a review, reconceptualization, and extension. IEEE Access 6, 29865–29884.

doi: 10.1109/ACCESS.2018.2841376
[31]

Barman SD, Reza AW, Kumar N, Karim ME and Munir AB (2015) Wireless powering by magnetic resonant coupling: recent trends in wireless power transfer system and its applications. Renewable and Sustainable Energy Reviews 51, 1525–1552.

doi: 10.1016/j.rser.2015.07.031
[32]

Lu X, Wang P, Niyato D, Kim DI and Han Z (2014) Wireless networks with RF energy harvesting: a contemporary survey. IEEE Communications Surveys & Tutorials 17, 757–789.

[33]

Roes MG, Duarte JL, Hendrix MA and Lomonova EA (2012) Acoustic energy transfer: a review. IEEE Transactions on Industrial Electronics 60(1), 242–248.

[34]

Ying W, Luguang Y and Shangang X (2005) Modeling and performance analysis of the new contactless power supply system. In 2005 International Conference on Electrical Machines and Systems, vol. 3, IEEE, pp. 1983– 1987.

[35]

Covic GA and Boys JT (2013) Inductive power transfer. Proceedings of the IEEE 101(6), 1276–1289.

[36]

Kurs A, Karalis A, Moffatt R, Joannopoulos JD, Fisher P and Soljačić M (2007). Wireless power transfer via strongly coupled magnetic resonances. Science 317(5834), 83–86.

doi: 10.1126/science.1143254
[37]

Aditya K and Williamson SS (2014) Comparative study of Series-Series and Series-Parallel compensation topologies for electric vehicle charging. In 2014 IEEE 23rd International Symposium on Industrial Electronics (ISIE), IEEE, pp. 426–430.

[38]

Chopra S and Bauer P (2011) Analysis and design considerations for a contactless power transfer system. In 2011 IEEE 33rd International Telecommunications Energy Conference (INTELEC), IEEE, pp. 1–6.

[39]

Pellitteri F, Boscaino V, Di Tommaso AO, Miceli R and Capponi G (2013) Inductive power transfer for 100W battery charging. In IECON 2013-39th Annual Conference of the IEEE Industrial Electronics Society, IEEE, pp. 894–899.

[40]

Wang CS, Covic GA and Stielau OH (2001) General stability criterions for zero phase angle controlled loosely coupled inductive power transfer systems. In IECON'01. 27th Annual Conference of the IEEE Industrial Electronics Society (Cat. No. 37243), vol. 2, IEEE, pp. 1049–1054.

[41]

Wang CS, Stielau OH and Covic GA (2005) Design considerations for a contactless electric vehicle battery charger. IEEE Transactions on Industrial Electronics 52(5), 1308–1314.

doi: 10.1109/TIE.2005.855672
[42]

Rituraj G, Kushwaha BK and Kumar P (2018) Contactless power transfer system for sealed lead acid battery charging. Wireless Power Transfer 5(1), 20.

doi: 10.1017/wpt.2017.18
[43]

Piri M, Špánik P, Frivaldský M and Kondelova A (2016) Wireless (power transfer) transmission of electrical energy (electricity) intended for consumer purposes up to 50 W. Advances in Electrical and Electronic Engineering 14(1), 40–48.

[44]

Trevisan R and Costanzo A (2014) State-of-the-art of contactless energy transfer (CET) systems: design rules and applications. Wireless Power Transfer 1(1), 10–20.

doi: 10.1017/wpt.2014.2
[45]

Vandevoorde G and Puers R (2001) Wireless energy transfer for stand-alone systems: a comparison between low and high power applicability. Sensors and Actuators A: Physical 92(1-3), 305–311.

doi: 10.1016/S0924-4247(01)00588-X
[46]

Soni UK and Tripathi RK (2017) Two phase bipolar and two phase split unipolar operation of PMSM with multiconfiguration stator using LABVIEW. In 2017 4th International Conference on Power, Control & Embedded Systems (ICPCES), IEEE, pp. 1–6.

[47]

Jiang B, Wang JG, Chen LJ, Wang B and Wang Q (2014) A efficient control method for series-parallel CPT system. in 2014 33rd, Chinese Control Conf. (CCC), Nanjing, China, pp. 3500–3504.