Content

Publications

Books

  • Gieras, J.F., Wang, R-J., Kamper, M.J., Axial Flux Permanent Magnet Brushless Machines, (Second Edition) the Springer, 375 pages, ISBN 978-1-4020-6993-2, (2008) (incl. CD-ROM); doi: 10.1007/978-1-4020-8227-6 Springer Amazon Google Scholar
  • Gieras, J.F., Wang, R-J., Kamper, M.J., Axial Flux Permanent Magnet Brushless Machines, Kluwer Academic Publishers, Dordrecht, The Netherlands, 340 pages, ISBN 1-4020-2661-7, (2004); doi: 10.1007/1-4020-2720-6 Kluwer Amazon Google Scholar

Journals

  • Sorgdrager, A.J., Wang, R-J., Grobler, A.J., "Multi-objective design of a line-start PM motor using the Taguchi method", IEEE Transactions on Industry Applications, vol. 54, no. 5, pp. 4167--4176, Sept.-Oct. 2018; doi: 10.1109/TIA.2018.2834306
  • Matthee, A., Wang, R-J., Agenbach, C.J., Els, D.N.J., Kamper, M.J., "Evaluation of a magnetic gear for air-cooled condenser applications", IET Electric Power Applications, vol. 12, no. 5, pp. 677--683, May 2018; doi: 10.1049/iet-epa.2017.0714
  • Gerber, S., Wang, R-J., "Cogging torque definitions of magnetic gears and magnetically geared machines", IEEE Transactions on Magnetics, vol. 54, no. 4, 8103209, April 2018; doi: 10.1109/TMAG.2017.2784823 download pdf
  • Chama, A., Gerber, S., Wang, R-J., "Newton-Raphson solver for finite element methods featuring nonlinear hysteresis models", IEEE Transactions on Magnetics, vol. 54, no. 1, 7400108, January 2018; doi: 10.1109/TMAG.2017.2761319
  • Sorgdrager, A.J., Wang, R-J., Grobler, A.J., "Taguchi method in electrical machine design", SAIEE Africa Research Journal, vol. 108, no. 4, pp. 150--164, December 2017; ISSN 1991-1696 open access
  • Chama, A., Sorgdrager, A.J., Wang, R-J., "Analytical synchronization analysis of line-start permanent magnet synchronous motors", Progress In Electromagnetics Research M, (PIER M), vol. 48, pp. 183--193, 2016; doi: 10.2528/PIERM16050311 open access
  • Wang, R-J., Matthee, A., Gerber, S., Tlali, P.M., "Calculation of torque performance of a novel magnetic planetary gear", IEEE Magnetics Letters, vol. 7, issue 1, 1303805, 2016; doi: 10.1109/LMAG.2016.2564948 download pdf
  • Tlali, P.M., Gerber, S., Wang, R-J., "Optimal design of an outer-stator magnetically geared permanent magnet machine", IEEE Transactions on Magnetics, vol. 52, no. 2, 8100610, February 2016; doi: 10.1109/TMAG.2015.2487886 download pdf
  • Wang, R-J., Brönn, L., Gerber, S., Tlali, P.M., "An axial flux magnetically geared PM wind generator", IEEJ Transactions on Electrical and Electronic Engineering, vol. 10, issue S1, pp. 123--132, October 2015; doi: 10.1002/tee.22173
  • Gerber, S., Wang, R-J., "Design and evaluation of a magnetically geared PM machine", IEEE Transactions on Magnetics, vol. 51, no. 8, 8107010, August 2015; doi: 10.1109/TMAG.2015.2421474 download pdf
  • Gerber, S., Wang, R-J., "Evaluation of movement facilitating techniques for finite element analysis of magnetically geared electrical machines", IEEE Transactions on Magnetics, vol. 51, no. 2, 7400206, February 2015; doi: 10.1109/TMAG.2014.2351787
  • Wang, R-J., Gerber, S., "Magnetically geared wind generator technologies: opportunities and challenges", Applied Energy, vol. 136, pp. 817--826, Elsevier, November 2014; doi: 10.1016/j.apenergy.2014.07.079
  • Kamper, M.J., Wang, R-J., Rossouw, F.G., "Analysis and performance of axial flux permanent magnet machine with air-cored non-overlapping concentrated stator windings", IEEE Transactions on Industry Applications, vol. 44, no. 5, pp. 1495--1504, September/October 2008; doi: 10.1109/TIA.2008.2002183
  • Kamper, M.J., Rasmeni, S., Wang, R-J., "Finite element time-step simulation of the switched reluctance machine drive under single pulse mode operation", IEEE Transactions on Magnetics, vol. 43, no. 7, pp. 3202--3208, July 2007; doi: 10.1109/TMAG.2007.892792
  • Sibande, S.E., Kamper, M.J., Wang, R-J., "Design and performance evaluation of a medium power PM-assisted reluctance synchronous traction machine using bonded PM-sheets", SAIEE Africa Research Journal, vol. 97, no. 1, pp. 14--21, March 2006 open access
  • Wang, R-J., Kamper, M.J., Dobson, R.T., "Development of a thermofluid model for axial field permanent magnet machines", IEEE Transactions on Energy Conversion, vol. 20, no. 1, pp. 80--87, March 2005; doi: 10.1109/TEC.2004.837301
  • Wang, R-J., Kamper, M.J., van der Westhuizen, K., Gieras, J.F., "Optimal design of a coreless stator axial field permanent magnet generator", IEEE Transactions on Magnetics, vol. 41, no. 1, pp. 55--64, January 2005; doi: 10.1109/TMAG.2004.840183
  • Wang, R-J., Kamper, M.J., "Calculation of eddy current loss in axial field permanent magnet machine with coreless stator", IEEE Transactions on Energy Conversion, vol. 19, no. 3, pp. 532--538, September 2004; doi: 10.1109/TEC.2004.832043
  • Wang, R-J., Mohellebi, H., Flack, T.J., Kamper, M.J., Buys, J.D., Feliachi, M., "Two dimensional Cartesian airgap element (CAGE) for dynamic FE modeling of electrical machines with a flat airgap", IEEE Transactions on Magnetics, vol. 38, no. 2, pp. 1357--1360, March 2002; doi: 10.1109/20.996024
  • Wang, R-J., Dobson, R., Kamper, M.J., "Thermofluid analysis of an axial flux permanent magnet (AFPM) generator", SAIMechE. R & D Journal, vol. 17, no. 1, pp. 18--26, March 2001 (Silver medal award from SA Institution of Mechanical Engineering)
  • Wang, R-J., Gieras, J.F., Ronda, J., "Analysis of forces in a hybrid linear stepping motor", Electromotion, vol. 4, no. 1-2, pp. 15--20, January-June 1997
  • Li, D., Wang, R-J., "Analysis of waveguide to microstrip transition", Microwave and Optical Technology Letters, vol. 5, no. 3, pp. 128--130, March 1992; doi: 10.1002/mop.4650050310

Conferences

  • Gerber, S., Wang, R-J., "Comparison of three prototype flux-modulating permanent magnet machines", XXIII International Conference on Electrical Machines, (ICEM), pp. 2072--2078, 3-6 September 2018, Alexandroupoli, Greece
  • Agenbach, C.J., Els, D.N.J., Wang, R-J., Gerber, S., "Force and vibration analysis of magnetic gears", XXIII International Conference on Electrical Machines, (ICEM), pp. 752--758, 3-6 September 2018, Alexandroupoli, Greece
  • Tlali, P.M., Wang, R-J., Gerber, S., "Comparison of PM vernier and conventional synchronous 15 kW wind generators", XXIII International Conference on Electrical Machines, (ICEM), pp. 2065--2071, 3-6 September 2018, Alexandroupoli, Greece
  • Sorgdrager, A.J., Wang, R-J., Grobler, A.J., "Design optimization of a line-start PMSM considering transient and steady-state performance objectives", Proc. of IEEE Energy Conversion Congress and Exposition, (ECCE), pp. 5057--5064, 1-5 October 2017, Cincinnati, USA; doi: 10.1109/ECCE.2017.8096853
  • Tlali, P.M., Wang, R-J., "Mass and volume optimization of a permanent magnet vernier machine", Proc. of the 25th Southern African Universities Power Engineering Conference, (SAUPEC), pp. 315--319, 30 Jan.-1 Feb. 2017, Stellenbosch download pdf
  • Chama, A, Gerber, S., Wang, R-J., "Formulation of an alternative analytical solution technique for magnetostatic field problems", Proc. of the 25th Southern African Universities Power Engineering Conference, pp. 305--308, 30 Jan.-1 Feb. 2017, Stellenbosch download pdf
  • Sorgdrager, A.J., Wang, R-J., Grobler, A.J., "Transient performance optimisation of line- start permanent magnet synchronous motors using Taguchi based regression rate method", Proc. of the 25th Southern African Universities Power Engineering Conference, (SAUPEC), pp. 94--99, 30 Jan.-1 Feb. 2017, Stellenbosch download pdf
  • Gerber, S., Wang, R-J., "Statistical analysis of cogging torque considering various manufacturing imperfections", 2016 XXII International Conference on Electrical Machines (ICEM), pp. 2066--2072, Lausanne, Switzerland, 4-7 Sept. 2016; doi: 10.1109/ICELMACH.2016.7732807 download pdf
  • Chama, A., Sorgdrager, A.J., Wang, R-J., "Synchronization criteria of line-start permanent magnet synchronous motors: a revisit", Proc. of the Southern African Universities Power Engineering Conference, (SAUPEC), Johannesburg, South Africa, 26-28 January 2016; doi: 10.13140/RG.2.1.3218.2803 download pdf
  • Tlali, P.M., van der Merwe, J.D.G., Wang, R-J., Gerber, S., "Design aspects of a magnetically geared permanent magnet machine with an outer-stator", Proc. of the Southern African Universities Power Engineering Conference, (SAUPEC), Johannesburg, South Africa, 26-28 January 2016; doi: 10.13140/RG.2.1.2693.9927 download pdf
  • Smit, Q., Sorgdrager, A. J., Wang, R.-J., "Design and optimisation of a line-start synchronous reluctance motor", Proc. of the Southern African Universities Power Engineering Conference, (SAUPEC), Johannesburg, South Africa, 26-28 Jan. 2016; doi: 10.13140/RG.2.1.4266.8560 download pdf
  • Gerber, S., Wang, R.-J., "Design and evaluation of a PM vernier machine", Proc. of IEEE Energy Conversion Congress and Exposition, (ECCE), pp. 5188--5194, Montreal, Canada, 20-24 September 2015; doi: 10.1109/ECCE.2015.7310390
  • Sorgdrager, A.J., Wang, R-J., Grobler, A.J., "Transient performance investigation and Taguchi optimization of an line-start PMSPM", Proc. of IEEE International Electrical Machines and Drives Conference, (IEMDC), Coeur d'Alene, Idaho, United States, pp. 590--595, 10-13 May 2015; doi: 10.1109/IEMDC.2015.7409118
  • Sorgdrager, A.J., Wang, R-J., Grobler, A.J., "Retrofit design of a line-start PMSM using the Taguchi method," Proc. of IEEE International Electrical Machines and Drives Conference, (IEMDC), Coeur d'Alene, Idaho, United States, pp. 489--495, 10-13 May 2015; doi: 10.1109/IEMDC.2015.7409103
  • Sorgdrager, A.J., Smith, R., Wang, R.-J., "Rotor design of a line-start permanent magnet synchronous machine using the Taguchi method", Proc. of the Southern African Universities Power Engineering Conference, (SAUPEC), Johannesburg, South Africa, pp. 227--232, 28-29 January 2015 download pdf
  • Sorgdrager, A.J., Wang, R-J., Pfeffer, A.K., "Optimisation of a line-start permanent magnet synchronous machine for a load specific application", Proc. of the Southern African Universities Power Engineering Conference, (SAUPEC), Johannesburg, pp. 216--220, 28-29 January 2015 download pdf
  • Matthee, A., Gerber, S., Wang, R-J., "A high performance concentric magnetic gear", Proc. of the Southern African Universities Power Engineering Conference, (SAUPEC), Johannesburg, South Africa, pp. 203--207, 28-29 January 2015; doi: 10.13140/RG.2.1.1493.6167 download pdf
  • Tlali, P.M., Wang, R-J., Gerber, S., "Magnetic gear technologies: a review", Proc. of International Conference on Electrical Machines, (ICEM), Berlin, Germany, pp. 544--550, 2-5 September 2014; doi: 10.1109/ICELMACH.2014.6960233
  • Gerber, S., Wang, R-J., "Analysis of the end-effects in magnetic gears and magnetically geared machines", Proc. of International Conference on Electrical Machines, (ICEM), Berlin, Germany, pp. 396--402, 2-5 September 2014; doi: 10.1109/ICELMACH.2014.6960211
  • Tlali, P.M., Gerber, S., Wang, R-J., "Gear ratio selection of an outer-stator magnetically geared machine", Proc. of the Southern African Universities Power Engineering Conference, (SAUPEC), Durban, South Africa, pp. 242--248, 30-31 January 2014 download pdf
  • Els, J. P., Sorgdrager, A. J., Wang, R.-J., "A study of rotor topologies for line-start PM motors for cooling fan applications", Proc. of the Southern African Universities Power Engineering Conference, (SAUPEC), Durban, South Africa, pp. 284--289, 30-31 January 2014 download pdf
  • Gerber, S., Wang, R-J., "Implementation of moving band solver for finite element analysis of electrical machines", Proc. of the Southern African Universities Power Engineering Conference, (SAUPEC), Durban, South Africa, pp. 249--254, 30-31 January 2014; doi: 10.13140/RG.2.2.19859.89124 download pdf
  • Sorgdrager, A.J., Grobler, A.J., Wang, R-J., "Design procedure of a line-start permanent magnet synchronous machine", Proc. of the Southern African Universities Power Engineering Conference, (SAUPEC), Durban, South Africa, pp. 307--314, 30-31 January 2014 download pdf
  • Wang, R-J., Gerber, S., "Magnetically geared wind generator technologies: opportunities and challenges", Proc. of the 5th International Conference on Applied Energy, (ICAE), Pretoria, South Africa, 9 pages, 1-4 July 2013.
  • Wang, R-J., Brönn, L., Gerber, S., Tlali, P.M., "Design and evaluation of a disc-type magnetically geared PM wind generator", Proc. of IEEE International Conference on Power Engineering, Energy and Electrical Drives, (POWERENG), Istanbul, Turkey, pp. 1259--1264, 13-17 May 2013: doi: 10.1109/PowerEng.2013.6635793
  • Gerber, S., Wang, R-J., "Design of a magnetically geared PM machine", Proc. of IEEE International Conference on Power Engineering, Energy and Electrical Drives, (POWERENG), Istanbul, Turkey, pp. 852--857, 13-17 May 2013; doi: 10.1109/PowerEng.2013.6635721
  • Wang, R-J., Heyns, H.C., "Thermal analysis of a water-cooled interior permanent magnet traction machine", Proc. of IEEE International Conference on Industrial Technology, (ICIT), Cape Town, South Africa, pp. 416--421, 25-27 February 2013; doi: 10.1109/ICIT.2013.6505708
  • Gerber, S., Wang, R-J., "Evaluation of a prototype magnetic gear", Proc. of IEEE International Conference on Industrial Technology, (ICIT), Cape Town, South Africa, pp. 319--324, 25-27 February 2013; doi: 10.1109/ICIT.2013.6505692
  • Gerber, S., Wang, R-J., "Torque capability comparison of two magnetically geared PM machine topologies", Proc. of IEEE International Conference on Industrial Technology, (ICIT), Cape Town, South Africa, pp. 1915--1920, 25-27 February 2013; doi: 10.1109/ICIT.2013.6505970
  • Mutize, C., Wang, R-J., "Performance comparison of induction motor and line start PM motor for cooling fan applications", Proc. of the Southern African Universities Power Engineering Conference, (SAUPEC), North-West University, Potchefstroom, South Africa, pp. 122--126, 31 January - 1 February 2013; doi: 10.13140/RG.2.1.2542.1922 download pdf
  • Kierstead, H.J., Wang, R-J., Kamper, M.J., "Torque performance of axial flux permanent magnet fractional open slot machine with unequal teeth", Proc. of the Southern African Universities Power Engineering Conference, (SAUPEC), University of Cape Town, South Africa, pp. 203--207, 13-15 July 2011; doi: 10.13140/RG.2.2.32626.30400 download pdf
  • Mouton, Z., Wang, R-J., Kamper, M.J., "Evaluation of axial flux permanent magnet induction generator technology", Proc. of the Southern African Universities Power Engineering Conference, (SAUPEC), University of Cape Town, South Africa, pp. 197--202, 13-15 July 2011; doi: 10.13140/RG.2.1.4901.4883 download pdf
  • Wang, R-J., Kamper, M.J., "Force calculation of electric machines with a flat air-gap using hybrid finite element mesh", Proc. of International Conference on Electrical Machines, (ICEM), Rome, Italy, 3 pages, 6-8 September 2010; doi: 10.1109/ICELMACH.2010.5608466
  • Brönn, L., Wang, R-J., Kamper, M.J., "Development of a shutter type magnetic gear", Proc. of the Southern African Universities Power Engineering Conference, (SAUPEC), Wits University, Johannesburg, South Africa, pp. 78--82, 28-29 January 2010; doi: 10.13140/RG.2.1.5032.5606 download pdf
  • Kierstead, H., Wang, R-J., Kamper, M.J., "Design optimization of a single-sided axial flux permanent magnet in-wheel motor with double-layer non-overlap concentrated winding", Proc. of the Southern African Universities Power Engineering Conference, (SAUPEC), Stellenbosch, South Africa, pp. 36--40, 28-29 January 2009; doi: 10.13140/RG.2.2.11654.78400 download pdf
  • Potgieter, J.H.J., Lombard, A.H., Wang, R-J., Kamper, M.J., "Evaluation of a permanent magnet excited induction generator for renewable energy applications", Proc. of the Southern African Universities Power Engineering Conference, (SAUPEC), Stellenbosch, South Africa, pp. 299--304, 28-29 January 2009; doi: 10.13140/RG.2.2.15010.22726 download pdf
  • Kamper, M.J., Rix, A.J., Wills, D.A., Wang, R-J., "Formulation, finite-element modeling and winding factors of non-overlap winding permanent magnet machines", Proc. of the International Conference on Electrical Machines, (ICEM), Vilamoura, Portugal, 5 pages, 6-9 September 2008: doi: 10.1109/ICELMACH.2008.4799996
  • Randewijk, P.J., Kamper, M.J., Wang, R-J., "Analysis and performance evaluation of radial flux air-cored permanent magnet machines with concentrated coils", Proc. of the International Conference pm Power Electronics and Drive Systems, (PEDS), Bangkok, Thailand, pp. 189--195, November 27-30, 2007; doi: 10.1109/PEDS.2007.4487699
  • Rix, A., Kamper, M.J., Wang, R-J., "Design and performance evaluation of concentrated coil permanent magnet machines for in-wheel drives", Proc. of IEEE International Electric Machines and Drives Conference, (IEMDC), Antalya, Turkey, pp. 770--775, 3-5 May 2007; doi: 10.1109/IEMDC.2007.382765
  • Kamper, M.J., Wang, R-J., Rossouw, F., "Analysis and performance evaluation of axial flux air-cored stator permanent magnet machine with concentrated coils", Proc. of IEEE International Electric Machines and Drives Conference, (IEMDC), Antalya, Turkey, pp. 13--20, 3-5 May 2007; doi: 10.1109/IEMDC.2007.382765
  • Rix, A., Kamper, M.J., Wang, R-J., "Torque ripple and flux density variation due to stator slot opening of a concentrated coil permanent magnet machine", Proc. of Southern African Universities Power Engineering Conference, (SAUPEC), Cape Town, South Africa, 25-26 January 2007
  • Sibande, S.E., Kamper, M.J., Wang, R-J., Rakgati, E.T., "Optimal design of a PM-assisted rotor of a 110 kW reluctance synchronous machine", Proc. of IEEE Africon Conference, (AFRICON), Botswana, vol. 2, pp. 793--797, 15-17 September 2004; doi: 10.1109/AFRICON.2004.1406793
  • Sibande, S.E., Kamper, M.J., Wang, R-J., "Design optimisation of 110 kW reluctance synchronous machine with permanent magnet assisted rotor", Proc. of Southern African Universities Power Engineering Conference, (SAUPEC), Stellenbosch University, South Africa, Paper No. SAUPEC04-38, 22-23 January 2004
  • Wang, R-J., Kamper, M.J., "Evaluation of eddy current losses in an axial flux PM machine with an ironless stator", Proc. of IEEE-IAS 37th Annual Meeting, Pittsburgh, USA, vol. 2, pp. 1289--1294, 13-18 October 2002; doi: 10.1109/IAS.2002.1042724
  • Dobson, R.T., Mouton, C.J., Scowby, S., Wang, R-J., Kamper, M.J., "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 University, South Africa, 13-14 September 2001
  • Mbidi, D., van der Westhuizen, K., Wang, R-J., Kamper, M.J., Blom, J., "Mechanical design considerations of double-stage axial-flux permanent magnet machine", Proc. of IEEE-IAS 35th Annual Meeting, Rome, Italy, vol. 1, pp. 198--201, 8-12 October 2000; doi: 10.1109/IAS.2000.881075
  • Wang, R-J., Gieras, J.F., "Analysis of characteristics of a permanent magnet hybrid linear stepping motor", Proc. of International Conference on Electrical Machines, (ICEM), Istanbul, Turkey, pp. 833--838, 2-4 September 1998.
  • Wang, R-J., Gieras, J.F., "Performance calculation of a PM hybrid linear stepping motor by FEM and RNA", Proc. of 2nd International Symposium on Linear Drives for Industry Applications, (LDIA), Tokyo, Japan, pp. 400--403, 8-10 April 1998
  • Wang, R.-J., Gieras, J.F., "Performance calculation of a PM hybrid linear stepping motor", Proc. of the South African Universities Power Engineering Conference, (SAUPEC), Stellenbosch, South Africa, pp. 25--28, 20-21 January 1998
  • Wang, R-J., Gieras, J.F., Ronda, J., "Analysis of forces in a hybrid linear stepping motor", Proc. of the 2nd International Symposium on Advanced Electromechanical Motion Systems, (ELECTROMOTION), Cluj-Napoca, Romania, 8-9 May 1997 (invited paper)
  • Gieras, J. F., Wang, R.-J., "Calculation of forces in a hybrid linear stepping motor for machine tools", Proc. of the 7th European Conference on Power Electronics and Applications, (EPE), Trondheim, Norway, vol. 3, pp. 591--595, 8-10 September 1997.
  • Wang, R-J., Choi, Jae-ho, Gieras, J.F., "Analysis of a PM hybrid linear stepping motor: The finite element approach", Proc. of the 7th Symposium on Fundamental Problems of Power Electronics and Electromechanics, (PPEE), Gliwice-Ustron, Poland, pp. 57--62, 1997
  • Wang, R-J., Gieras, J.F., Wing, M., "Electromagnetic field distribution in a hybrid PM linear stepping motor", Proc. of IEEE Africon Conference, (AFRICON), Stellenbosch, South Africa, pp. 200--205, 25-27 September 1996; doi: 10.1109/AFRCON.1996.563106

Patents

  • Wang, R-J., Kamper, M.J. Magnetic Gear, Patent no.2012/02016, March 2012