Content

Publications

Books

  1. 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
  2. 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

  1. Sorgdrager, A. J., Wang, R.-J., Grobler, A. J., "Taguchi method in electrical machine design", SAIEE Africa Research Journal, vol. 108, no. 4, pp. 1--15, December 2017 (in press)
  2. Chama, A., Sorgdrager, A. J., Wang, R.-J., "Analytical synchronization analysis of line-start permanent magnet synchronous motors," in Progress In Electromagnetics Research M, (PIER M), vol. 48, pp. 183--193, 2016; doi: 10.2528/PIERM16050311 open access
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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 (PDF) open access
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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).
  17. 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.
  18. 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

  1. Sorgdrager, A.J., Wang, R-J., Grobler, A.J., "Design optimisation of a line-start PMSM considering both transient and steady-state performance objectives", IEEE Energy Conversion Congress and Exposition}, (ECCE), pp. 1-8, 1-5 October 2017, Cincinnati, USA (accepted)
  2. Tlali, P.M., Wang, R-J., "Mass and volume optimization of a permanent magnet vernier machine", Proceedings of the 25th Southern African Universities Power Engineering Conference, (SAUPEC), pp. 315--319, 30 Jan.-1 Feb. 2017, Stellenbosch (PDF)
  3. Chama, A, Gerber,S., Wang, R-J., "Formulation of an alternative analytical solution technique for magnetostatic field problems", Proceedings of the 25th Southern African Universities Power Engineering Conference, pp. 305--308, 30 Jan.-1 Feb. 2017, Stellenbosch (PDF)
  4. 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", Proceedings of the 25th Southern African Universities Power Engineering Conference, (SAUPEC), pp. 94--99, 30 Jan.-1 Feb. 2017, Stellenbosch (PDF)
  5. 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 September 2016; doi: 10.1109/ICELMACH.2016.7732807
  6. Chama, A., Sorgdrager, A. J., Wang, R.-J., "Synchronization criteria of line-start permanent magnet synchronous motors: a revisit," in Proceedings of the Southern African Universities Power Engineering Conference, (SAUPEC), Johannesburg, South Africa, 26-28 January 2016; doi: 10.13140/RG.2.1.3218.2803 open access
  7. 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," in Proceedings of the Southern African Universities Power Engineering Conference, (SAUPEC), Johannesburg, South Africa, 26-28 January 2016; doi: 10.13140/RG.2.1.2693.9927 open access
  8. Smit, Q., Sorgdrager, A. J., Wang, R.-J., "Design and optimisation of a line-start synchronous reluctance motor," in Proceedings of the Southern African Universities Power Engineering Conference, (SAUPEC), Johannesburg, South Africa, 26-28 January 2016; doi: 10.13140/RG.2.1.4266.8560 open access
  9. Gerber, S., Wang, R.-J., "Design and evaluation of a PM vernier machine," in Proceedings of IEEE Energy Conversion Congress and Exposition, (ECCE), pp. 5188--5194, Montreal, Canada, September 2015; doi: 10.1109/ECCE.2015.7310390
  10. Sorgdrager, A. J., Wang, R.-J., Grobler, A. J., "Transient performance investigation and Taguchi optimization of an line-start PMSPM," in Proceedings of IEEE International Electrical Machines and Drives Conference, (IEMDC), Coeur d'Alene, Idaho, USA, pp. 590--595, 10-13 May 2015; doi: 10.1109/IEMDC.2015.7409118
  11. Sorgdrager, A. J., Wang, R.-J., Grobler, A. J., "Retrofit design of a line-start PMSM using the Taguchi method," in Proceedings of IEEE International Electrical Machines and Drives Conference, (IEMDC), Coeur d'Alene, Idaho, USA, pp. 489--495, 10-13 May 2015; doi: 10.1109/IEMDC.2015.7409103
  12. Sorgdrager, A. J., Smith, R., Wang, R.-J., "Rotor design of a line-start permanent magnet synchronous machine using the Taguchi method," in Proceedings of the Southern African Universities Power Engineering Conference, (SAUPEC), Johannesburg, South Africa, pp. 227--232, 28-29 January 2015 open access
  13. Sorgdrager, A. J., Wang, R.-J., Pfeffer, A. K., "Optimisation of a line-start permanent magnet synchronous machine for a load specific application," in Proceedings of the Southern African Universities Power Engineering Conference, (SAUPEC), Johannesburg, pp. 216--220, 28-29 January 2015 open access
  14. Matthee, A., Gerber, S., Wang, R.-J., "A high performance concentric magnetic gear," in Proceedings 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 open access
  15. Tlali, P. M., Wang, R.-J., Gerber, S., "Magnetic gear technologies: a review," in Proceedings of International Conference on Electrical Machines, (ICEM), Berlin, Germany, pp. 544--550, September 2014; doi: 10.1109/ICELMACH.2014.6960233
  16. Gerber, S., Wang, R.-J., "Analysis of the end-effects in magnetic gears and magnetically geared machines," in Proceedings of International Conference on Electrical Machines, (ICEM), Berlin, Germany, pp. 396--402, September 2014; doi: 10.1109/ICELMACH.2014.6960211
  17. Tlali, P. M., Gerber, S., Wang, R.-J., "Gear ratio selection of an outer-stator magnetically geared machine," in Proceedings of the Southern African Universities Power Engineering Conference, (SAUPEC), Durban, South Africa, pp. 242--248, 30-31 January 2014 open access
  18. Els, J. P., Sorgdrager, A. J., Wang, R.-J., "A study of rotor topologies for line-start PM motors for cooling fan applications" in Proceedings of the Southern African Universities Power Engineering Conference, (SAUPEC), Durban, South Africa, pp. 284--289, 30-31 January 2014 open access
  19. Gerber, S., Wang, R.-J., "Implementation of moving band solver for finite element analysis of electrical machines" in Proceedings 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 open access
  20. Sorgdrager, A. J., Grobler, A. J., Wang, R.-J., "Design procedure of a line-start permanent magnet synchronous machine" in Proceedings of the Southern African Universities Power Engineering Conference, (SAUPEC), Durban, South Africa, pp. 307--314, 30-31 January 2014 open access
  21. Wang, R.-J., Gerber, S., "Magnetically geared wind generator technologies: opportunities and challenges," in Proceedings of the 5th International Conference on Applied Energy, (ICAE), Pretoria, South Africa, 9 pages, 1-4 July 2013.
  22. Wang, R.-J., Brönn, L., Gerber, S., Tlali, P. M., "Design and evaluation of a disc-type magnetically geared PM wind generator," in Proceedings 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
  23. Gerber, S., Wang, R.-J., "Design of a magnetically geared PM machine," in Proceedings 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
  24. Wang, R.-J., Heyns, H. C., "Thermal analysis of a water-cooled interior permanent magnet traction machine," in Proceedings 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
  25. Gerber, S., Wang, R.-J., "Evaluation of a prototype magnetic gear," in Proceedings 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
  26. Gerber, S., Wang, R.-J., "Torque capability comparison of two magnetically geared PM machine topologies," in Proceedings 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
  27. Mutize, C., Wang, R.-J., "Performance comparison of induction motor and line start PM motor for cooling fan applications," in Proceedings 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 open access
  28. Kierstead, H. J., Wang, R.-J., Kamper, M. J., "Torque performance of axial flux permanent magnet fractional open slot machine with unequal teeth," in Proceedings 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 open access
  29. Mouton, Z., Wang, R.-J., Kamper, M. J., "Evaluation of axial flux permanent magnet induction generator technology," in Proceedings 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 open access
  30. Wang, R.-J., Kamper, M. J., "Force calculation of electric machines with a flat air-gap using hybrid finite element mesh," in Proceedings of International Conference on Electrical Machines, (ICEM), Rome, Italy, 3 pages, 6-8 September 2010; doi: 10.1109/ICELMACH.2010.5608466
  31. Brönn, L., Wang, R-J., Kamper, M.J., "Development of a shutter type magnetic gear," in Proceedings 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 open access
  32. 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," in Proceedings 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 open access
  33. 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," in Proceedings 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 open access
  34. 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," in Proceedings of the International Conference on Electrical Machines, (ICEM), Vilamoura, Portugal, 5 pages, 6-9 September 2008: doi: 10.1109/ICELMACH.2008.4799996
  35. Randewijk, P. J., Kamper, M. J., Wang, R.-J., "Analysis and performance evaluation of radial flux air-cored permanent magnet machines with concentrated coils," in Proceedings 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
  36. Rix, A., Kamper, M. J., Wang, R.-J., "Design and performance evaluation of concentrated coil permanent magnet machines for in-wheel drives," in Proceedings of IEEE International Electric Machines and Drives Conference, (IEMDC), Antalya, Turkey, pp. 770--775, 2007; doi: 10.1109/IEMDC.2007.382765
  37. Kamper, M. J., Wang, R.-J., Rossouw, F., "Analysis and performance evaluation of axial flux air-cored stator permanent magnet machine with concentrated coils," in Proceedings of IEEE International Electric Machines and Drives Conference, (IEMDC), Antalya, Turkey, pp. 13--20, 2007; doi: 10.1109/IEMDC.2007.382765
  38. 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," in Proceedings of Southern African Universities Power Engineering Conference, (SAUPEC), Cape Town, South Africa, 2007.
  39. 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," in Proceedings of IEEE Africon Conference, (AFRICON), Botswana, vol. 2, pp. 793--797, 2004; doi: 10.1109/AFRICON.2004.1406793
  40. Sibande, S. E., Kamper, M. J., Wang, R.-J., "Design optimisation of 110 kW reluctance synchronous machine with permanent magnet assisted rotor," in Proceedings of Southern African Universities Power Engineering Conference, (SAUPEC), Stellenbosch University, South Africa, Paper No. SAUPEC04-38, January 2004.
  41. Wang, R.-J., Kamper, M. J., "Evaluation of eddy current losses in an axial flux PM machine with an ironless stator," in Proceedings of IEEE-IAS 37th Annual Meeting, Pittsburgh, USA, vol. 2, pp. 1289--1294, 2002; doi: 10.1109/IAS.2002.1042724
  42. Dobson, R. T., Mouton, C. J., Scowby, S., Wang, R.-J., Kamper, M. J., "Thermofluid modeling of an axial flux permanent magnet machine," in Western Cape Forum for Mechanical Engineering Research Conference on Heat Transfer, Energy Conversion and Fluid Dynamics, Stellenbosch University, South Africa, 13-14 September 2001.
  43. 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," in Proceedings of IEEE-IAS 35th Annual Meeting, Rome, Italy, vol. 1, pp. 198--201, 2000; doi: 10.1109/IAS.2000.881075
  44. Wang, R.-J., Gieras, J. F., "Analysis of characteristics of a permanent magnet hybrid linear stepping motor," in Proceedings of International Conference on Electrical Machines, (ICEM), Istanbul, Turkey, pp. 833--838, September 1998.
  45. Wang, R.-J., Gieras, J. F., "Performance calculation of a PM hybrid linear stepping motor by FEM and RNA," in Proceedings of 2nd International Symposium on Linear Drives for Industry Applications, (LDIA), Tokyo, Japan, pp. 400--403, 1998.
  46. Wang, R.-J., Gieras, J. F., "Performance calculation of a PM hybrid linear stepping motor," in Proceedings of the South African Universities Power Engineering Conference, (SAUPEC), Stellenbosch, South Africa, pp. 25--28, 20-21 January 1998.
  47. Wang, R.-J., Gieras, J. F., Ronda, J., "Analysis of forces in a hybrid linear stepping motor," in Proceedings of the 2nd International Symposium on Advanced Electromechanical Motion Systems, (ELECTROMOTION), Cluj-Napoca, Romania, 1997 (invited paper).
  48. Gieras, J. F., Wang, R.-J., "Calculation of forces in a hybrid linear stepping motor for machine tools," in Proceedings of the 7th European Conference on Power Electronics and Applications, (EPE), Trondheim, Norway, vol. 3, pp. 591--595, 1997.
  49. Wang, R.-J., Choi, Jae-ho, Gieras, J. F., "Analysis of a PM hybrid linear stepping motor: The finite element approach," in Proceedings of the 7th Symposium on Fundamental Problems of Power Electronics and Electromechanics, (PPEE), Gliwice-Ustron, Poland, pp. 57--62, 1997.
  50. Wang, R.-J., Gieras, J. F., Wing, M., "Electromagnetic field distribution in a hybrid PM linear stepping motor," in Proceedings of IEEE Africon Conference, (AFRICON), Stellenbosch, South Africa, pp. 200--205, September 1996; doi: 10.1109/AFRCON.1996.563106

Patents

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