Professor Rong-Jie Wang MSc(Eng) UCT, PhD(Eng) Stell, SMIEEE

Research Focus:

Special electric machines, design and optimisation, finite element analysis, computational electromagnetics, cooling and losses analysis, renewable energy systems.

My research interests are special electrical machines, novel topologies of permanent magnet machines, computer-aided design of electrical machines, finite element methods, optimisation methodologies, cooling design and analysis, renewable energy systems. Recently, my work has been focusing on magnetic gear and magnetically geared electrical machine technologies. Our research has been mainly supported by local and international companies.

Current Postgraduate Students

Past Postgraduate Students

Post-doctoral Researchers

Research Publucations:

 

Books:

2nd Edition

J.F. Gieras, R-J. Wang, M.J. Kamper, Axial Flux Permanent Magnet Brushless Machines, (Second Edition) the Springer, 375 pp, ISBN 978-1-4020-6993-2, (2008) (incl. CD-ROM).

Springer Amazon Google Scholar

Book

J.F. Gieras, R-J. Wang, M.J. Kamper, Axial Flux Permanent Magnet Brushless Machines, Kluwer Academic Publishers, Boston-Dordrecht-London, The Netherlands, 340 pp, ISBN 1-4020-2661-7, (2004).

Kluwer AmazonGoogle Scholar

Journal:

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P.M. Tlali, S. Gerber, R-J. Wang, "Optimal design of an outer-stator magnetically geared permanent magnet machine", IEEE Trans. on Magnetics, 52(2): 8100610, Feb 2016 (Link)

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R-J. Wang, L. Bronn, S. Gerber, P.M. Tlali, "An axial flux magnetically geared PM wind generator", IEEJ Trans. Elec. Electron. Eng., 10(S1): S123–S132, 14 Oct 2015; doi: 10.1002/tee.22173 (link)

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S. Gerber, R-J. Wang, "Design and evaluation of a magnetically geared PM machine", IEEE Trans. on Magnetics, 51(8): 8107010, Aug 2015 (Link)

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S. Gerber, R-J. Wang, "Evaluation of movement facilitating techniques for finite element analysis of magnetically geared electrical machines", IEEE Trans. on Magnetics, 51(2): 7400206, Feb 2015

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R-J. Wang, S. Gerber, "Magnetically geared wind generator technologies: Opportunities and challenges", Applied Energy, 136: 817-826, Elsevier, 2014 (Link) (IF: 5.597)

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M.J. Kamper, R-J Wang, F.R. Rossouw,"Analysis and performance of axial flux permanent-magnet machine with air-cored non-overlapping concentrated stator windings,", IEEE Trans. on Industry Applications,44(5): 1495-1504, Sep/Oct 2008.

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M.J. Kamper, S.W. Rasmeni, R-J. Wang, "Finite element time-step simulation of the switched reluctance machine drive under single pulse mode operation", IEEE Trans. on Magnetics, 43(7): 3202-3208, July 2007.

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S.E. Sibande, M.J. Kamper, R-J. Wang, "Design and performance evaluation of a medium power PM-assisted reluctance synchronous traction machine using bonded PM-sheets", SAIEE Africa Research Journal, 97(1): 14-21, March 2006. (PDF)

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R-J. Wang, M.J. Kamper, R.T. Dobson, "Development of a thermofluid model for axial field permanent magnet machines", IEEE Trans. on Energy Conversion, 20(1): 80-87, March 2005.

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R-J. Wang, M.J. Kamper, K. Van der Westhuizen, J.F. Gieras, "Optimal design of a coreless stator axial field permanent magnet generator", IEEE Trans. on Magnetics, 41(1): 55-64, Jan 2005.

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R-J. Wang, M.J. Kamper, "Calculation of eddy current loss in axial field permanent magnet machine with coreless stator'', IEEE Trans. on Energy Conversion, 19(3): 532-538, September 2004.

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R-J. Wang, H. Mohellebi, T.J. Flack, M.J. Kamper, J.D. Buys, M. Feliachi, "Two-dimensional Cartesian air-gap element (CAGE) for dynamic finite element modeling of electrical machines with a flat air-gap'', IEEE Trans. on Magnetics, 38(2): 1357-1360, March 2002.

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R-J. Wang, R.T. Dobson, M.J. Kamper, "Thermofluid analysis of an axial flux permanent magnet (AFPM) generator'', S.A. Institution of Mechanical Engineering, R & D Journal, 17(1): 18-26, March 2001. (paper received silver medal from SAIMechE)

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R-J. Wang, J.F. Gieras, J. Ronda, "Analysis of forces in a hybrid linear stepping motor ", Electromotion Journal, 4(1-2): 15-20, Jan-Jun 1997.

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D. Li, R-J. Wang, "Analysis of waveguide-to-microstrip transition", Microwave and Optical Technology Letter, 5(3): 128-130, Wiley, March 1992.

Conference:

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A. Chama, A.J. Sorgdrager, R-J. Wang, "Synchronization criteria of line-start permanent magnet synchronous motors: a revisit", Proc. of the 24th Southern African Universities Power Engineering Conference, 26-28 Jan. 2016, Vereeniging, South Africa.

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P.M. Tlali, J. van der Merwe, R-J. Wang, S. Gerber, "Design aspects of a magnetically geared permanent magnet machine with an outer-stator", Proc. of the 24th Southern African Universities Power Engineering Conference, 26-28 Jan. 2016, Vereeniging, South Africa.

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Q. Smit, A.J. Sorgdrager, R-J. Wang, "Design and optimisation of a line-start synchronous reluctance motor", Proc. of the 24th Southern African Universities Power Engineering Conference, 26-28 Jan. 2016, Vereeniging, South Africa.

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S. Gerber, R-J. Wang, "Design and evaluation of a PM vernier machine", Proc. of the IEEE Energy Conversion Congress & Exposition (ECCE), pp.5188-5194, 20-24 Sept. 2015, Montreal, Canada.

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A.J. Sorgdrager, R-J. Wang, A.J. Grobler, "Transient performance investigation and Taguchi optimization of a line-start PMSM", Proc. of the IEEE Int'l Electr. Machines & Drives Conf. (IEMDC), pp.590-595, 10-13 May. 2015, Coeur d’Alene, ID, USA.

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A.J. Sorgdrager, R-J. Wang, A.J. Grobler, "Retrofit design of a line-start PMSM using the Taguchi method", Proc. of the IEEE Int'l Electr. Machines & Drives Conf. (IEMDC), pp.489-495, 10-13 May. 2015, Coeur d’Alene, ID, USA.

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A.J. Sorgdrager, R. Smith, R-J. Wang, "Rotor design of a line-start permanent magnet synchronous machine using the Taguchi method", Proc. of the 23rd Southern African Universities Power Engineering Conference, pp.227-232, 28-29 Jan. 2015, Johannesburg, South Africa. (PDF)

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A.J. Sorgdrager, R-J. Wang, A.K. Pfeffer, "Optimisation of a line-start permanent magnet synchronous machine for a load specific application", Proc. of the 23rd Southern African Universities Power Engineering Conference, pp.216-220, 28-29 Jan. 2015, Johannesburg, South Africa. (PDF)

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A. Matthee, S. Gerber, R-J. Wang, " A high performance concentric magnetic gear", Proc. of the 23rd Southern African Universities Power Engineering Conference, pp.203-207, 28-29 Jan. 2015, Johannesburg, South Africa. (PDF)

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S. Gerber, R-J. Wang, "Analysis of the end-effects in magnetic gears and magnetically geared machines", Proc. of the Int. Conf. on Electrical Machines (ICEM), pp.396-402, 2-5 Sept, 2014, Berlin, Germany. (Link)

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P.M. Tlali, R-J. Wang, S. Gerber, "Magnetic gear technologies: a review", Proc. of the Int. Conf. on Electrical Machines (ICEM), pp.544-550, 2-5 Sept, 2014, Berlin, Germany. (Link)

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A.J. Sorgdrager, A.J. Grobler, R-J. Wang, "Design procedure of a line-start permanent magnet synchronous machine", Proc. of the 22nd Southern African Universities Power Engineering Conference, pp.307-314, 30-31 Jan. 2014, Durban, South Africa. (PDF)

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J-P Els, A. Sorgdrager, R-J. Wang, "A study of rotor topologies of line-start PM motors for cooling fan applications", Proc. of the 22nd Southern African Universities Power Engineering Conference, pp.284-289, 30-31 Jan. 2014, Durban, South Africa. (PDF)

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S. Gerber, R-J. Wang, "Implementation of a moving band solver for finite element analysis of electrical machines", Proc. of the 22nd Southern African Universities Power Engineering Conference, pp.249-254, 30-31 Jan. 2014, Durban, South Africa. (PDF)

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P.M. Tlali, S. Gerber, R-J. Wang, "Gear ratio selection of an outer-stator magnetically geared machine", Proc. of the 22nd Southern African Universities Power Engineering Conference, pp.242-248, 30-31 Jan. 2014, Durban, South Africa. (PDF)

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R-J. Wang, S. Gerber, "Magnetically geared wind generator technologies: opportunities and challenges", The 5th Int. Conf. on Applied Energy (ICAE), 9 pp, 1-4 July 2013, Pretoria, South Africa.

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R-J. Wang, L. Bronn, S. Gerber, P.M. Tlali, "Design and evaluation of a disc-type magnetically geared PM wind generator", IEEE Int. Conf. on Power Engineering, Energy and Electrical Drives (POWERENG), (Paper-524), pp.1259-1264, 13-17 May, 2013, Istanbul, Turkey.

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S. Gerber, R-J. Wang, "Design of a magnetically geared PM machine", IEEE Int. Conf. on Power Engineering, Energy and Electrical Drives (POWERENG), (Paper-359), pp.852-857, 13-17 May, 2013, Istanbul, Turkey.

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R-J. Wang, H.C. Heyns, "Thermal analysis of a water-cooled interior permanent magnet traction machine", Proc. of IEEE Int. Conf. on Industrial Technology (ICIT), pp.416-421, 25-27 Feb., 2013, Cape Town, South Africa.

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S. Gerber, R-J. Wang, "Evaluation of a prototype magnetic gear", Proc. of IEEE Int. Conf. on Industrial Technology (ICIT), pp. 319-324, 25-27 Feb., 2013, Cape Town, South Africa.

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S. Gerber, R-J. Wang, " Torque capability comparison of two magnetically geared PM machine topologies", Proc. of IEEE Int. Conf. on Industrial Technology (ICIT), pp.1915-1920, 25-27 Feb., 2013, Cape Town, South Africa.

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C. Mutize, R-J. Wang, "Performance comparison of induction motor and line start PM motor for cooling fan applications", Proc. of the 21st Southern African Universities Power Engineering Conference, pp.122-126, 31 Jan. - 1 Feb., 2013, North-West University, Potchefstroom, South Africa. (PDF)

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H.J. Kierstead, R-J. Wang, M.J. Kamper, "Torque performance of axial flux permanent magnet fractional open slot machine with unequal teeth", Proc. of the 20th Southern African Universities Power Engineering Conference, pp. 203-207, 13-15 July 2011, University of Cape Town, South Africa. (PDF)

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Z. Mouton, R-J. Wang, M.J. Kamper, "Evaluation of axial flux permanent magnet induction generator technology", Proc. of the 20th Southern African Universities Power Engineering Conference, pp.197-202, 13-15 July 2011, University of Cape Town, South Africa. (PDF)

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R-J. Wang, M.J. Kamper, "Force calculation of electric machines with a flat air-gap using hybrid finite element mesh", Int. Conf. on Electrical Machines (ICEM), 3 pp, 6-8 Sept, 2010, Rome, Italy.

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L. Bronn, R-J. Wang, M.J. Kamper, "Development of a shutter type magnetic gear", Proc. of the 19th Southern African Universities Power Engineering Conference, pp.78-82, Jan. 2010, Wits University, Johannesburg. (PDF)

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H. Kierstead, R-J. Wang, M.J. Kamper, "Design optimization of a single-sided axial flux permanent magnet in-wheel motor with double-layer non-overlap concentrated winding", Proc. of the 18th Southern African Universities Power Engineering Conference, pp.36-40, 2009, Stellenbosch. (PDF)

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J.H.J. Potgieter, A.N. Lombard, R-J. Wang, M.J. Kamper, "Evaluation of a permanent magnet excited induction generator for renewable energy applications", Proc. of the 18th Southern African Universities Power Engineering Conference, pp. 299-304, 2009, Stellenbosch. (PDF)

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M.J. Kamper, A.J. Rix, D.A. Wills, R-J. Wang, "Formulation, finite-element modelling and winding factors of non-overlap winding permanent magnet machines", Proc. of Int. Conference on Electrical Machines (ICEM), 6-9 Sept, 2008, Vilamoura, Portugal.

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P.J. Randewijk, M.J. Kamper, R-J. Wang, "Analysis and performance evaluation of radial flux air-cored permanent magnet machines with concentrated coils", 7th Int. Conf. on Power Electronics and Drive Systems, 27-30 Nov, 2007, Bangkok, Thailand (2A.04.P436)

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A. Rix, M.J. Kamper, R-J. Wang, "Torque ripple and flux density variation due to stator slot openning of a concentrated coil permanent magnet machine". Proc. of Southern African Universities Power Engineering Conference, 2007, Cape Town.

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A. Rix, M.J. Kamper, R-J. Wang, "Design and performance evaluation of concentrated coil permanent magnet machines for in-wheel drives", IEEE-IEMDC Conference, pp.770 - 775, May 2007, Turkey.

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M.J. Kamper, R-J. Wang, F.R. Rossouw, "Analysis and performance evaluation of axial flux air-cored stator permanent magnet machine with concentrated coils", IEEE-IEMDC Conference, pp.13 - 20, May 2007, Turkey.

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S.E. Sibande, M.J. Kamper, R-J. Wang, E.T. Rakgati, "Optimal design of a PM-assisted rotor for a large power reluctance synchronous machine" , Proc. of IEEE AFRICON Conference, (2):793 - 797, Sept., 2004, Botswana.

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S.E. Sibande, M.J. Kamper, R-J. Wang, "Design optimisation of 110 kW reluctance synchronous machine with permanent magnet assisted rotor". Proc. of Southern African Universities Power Engineering Conference, Paper No. SAUPEC04-38, Stellenbosch University, 2004.

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R-J. Wang, M.J. Kamper, "Evaluation of eddy current losses in axial flux permanent magnet (AFPM) machine with an ironless stator", 37th IEEE-IAS Annual Meeting Record, Oct. 2002, Pittsburgh, USA.

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R.T. Dobson, C.J. Mouton, S. Scowby, R-J. Wang, M.J. Kamper, "Thermofluid modeling of an axial flux permanent magnet machine", Western Cape Forum for Mechanical Engineering Research Conference on Heat Transfer, Energy Conversion and Fluid Dynamics, Stellenbosch, 13-14 Sept. 2001.

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D.N. Mbidi, K. van der Westhuizen, R-J. Wang, M.J. Kamper, J. Blom, "Mechanical design considerations of a double-stage axial-flux PM machine", 35th IEEE-IAS Conference Record, 2000, Rome, Italy.

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R-J. Wang, J.F. Gieras, "Analysis of characteristics of a permanent magnet hybrid linear stepping motor", Int. Conf. on Electrical Machines (ICEM), 1998, pp. 833-838, Istanbul, Turkey.

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R-J. Wang, J.F. Gieras, "Performance calculation of a PM hybrid linear stepping motor by FEM and RNA", 2nd Int. Symp. on Linear Drives for Industry Applications (LDIA), 1998, pp. 400-403, Tokyo, Japan.

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R-J. Wang, J.F. Gieras, "Performance calculation of a PM hybrid linear stepping motor", Proc. of Southern African Universities Power Engineering Conference (SAUPEC), 20-21 Jan., 1998, pp. 25-28, Stellenbosch, South Africa.

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R-J. Wang, J.F. Gieras, J. Ronda,"Analysis of forces in a hybrid linear stepping motor", the 2nd Int. Symp. on Advanced Electromechanical Motion Systems (ELECTROMOTION), 1997, Cluj-Napoca, Romania (invited paper).

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J.F. Gieras, R-J. Wang, "Calculation of forces in a hybrid linear stepping motor for machine tools", the 7th European Conf. on Power Electronics and Applications (EPE), 1997, vol.3, pp. 591-595, Trondheim, Norway.

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R-J. Wang, Jae-ho Choi, J.F. Gieras, "Analysis of a PM hybrid linear stepping motor: The finite element approach", the 7th Symp. on Fundamental Problems in Power Electronics and Electromechanics (PPEE), Gliwice-Ustron, 1997, pp.57-62, Poland.

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R-J. Wang, J.F. Gieras, "Electromagnetic field distribution in a hybrid PM linear stepping motor", Proc. of IEEE AFRICON Conference, Sept. 1996, pp. 200-205, Stellenbosch, South Africa.

 

Patents:

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R-J. Wang, M.J. Kamper, "Magnetic gear", Patent no. 2012/02016, March 2012
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