Content

Publications

Books

  • 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)
  • Gieras, J.F., Wang, R-J., Kamper, M.J., Axial Flux Permanent Magnet Brushless Machines, (Second Edition) Springer, 375 pages,
    ISBN 978-1-4020-6993-2, (2008) (incl. CD-ROM); doi: 10.1007/978-1-4020-8227-6 (Springer) (Amazon)
  • Wang, R-J., Kamper, M.J. (Eds.), The Study of Emerging Electrical Machine Technologies and Their Applications, MDPI, Basel,
    248 pages, ISBN 978-3-0365-7567-4, (2023); doi: 10.3390/books978-3-0365-7567-4 (Mdpi AG) (Amazon)
  • Gieras, J.F., Wang, R-J., Kamper, M.J., Axial Flux Permanent Magnet Brushless Machines -- 轴向磁通永磁无刷电机 (原书第二版), (Chinese Version) (Translated by: Y. Huang and B. Guo), China Machine Press, 302 pages, ISBN 978-7-1117-7827-1, (2025)

Chapters

  • Teymoori, V., Azid, S.I., Metha, U., Mohammadi, A., Kamper, M.J., Wang, R-J., Sensorless fractional-order PI control of high-power propulsion PMSM based on fast terminal sliding mode observer, In Wang, H. (Ed.), Proceedings of the First International Conference on Advanced Robotics, Control, and Artificial Intelligence (ICARCAI 2024) (Lecture Notes in Networks and Systems, Vol. 1376, pp. 519--533). Springer, ISBN 978-981-96-5373-7, (2025)

Journals

  • Arish, N., Kamper, M.J., Wang, R-J., "Advancements in electrical marine propulsion technologies: a comprehensive overview”, SAIEE Africa Research Journal, vol. 116, no. 1, pp. 14--29, March 2025, doi: 10.23919/SAIEE.2025.10755059 (open access)
  • Eichin, F., Kamper, M.J., Gerber, S., Wang, R-J., "Symmetrical short-circuit behavior prediction of rare-earth permanent magnet synchronous motors", World Electric Vehicle Journal, vol. 15, no. 11, pp. 1--22, Art no. 536, November 2024, doi: 10.3390/wevj15110536 (open access)
  • Mugyema, M, Kamper, M.J., Wang, R-J., Sebitosi, A.B., "Performance and cost comparison of drive technologies for a linear electric machine gravity energy storage system," IEEE Access, vol. 12, pp. 46953--46966, March 2024, doi: 10.1109/access.2024.3383161 (open access)
  • Arish, N., Kamper, M.J., Wang, R-J., "Design and optimisation of a 5-MW permanent magnet vernier motor for podded ship propulsion," World Electric Vehicle Journal, vol. 15, no. 3, pp. 1--21, March 2024, Art no. 119, doi: 10.3390/wevj15030119 (open access)
  • Wang, R-J., Holm, S.R., Scheepers, J., Gerber, S., "Load angle of flux modulated magnetic gears," Progress In Electromagnetics Research C, (PIER C), vol. 132, pp. 255--269, 2023; doi: 10.2528/pierc23031603 (open access)
  • Teymoori, V., Kamper, M.J., Wang, R-J., Kennel, R., "Sensorless control of dual three-phase permanent magnet synchronous machines - A review," Energies, vol. 16, no. 3, pp. 1--21, January 2023, Art no. 1326, doi: 10.3390/en16031326 (open access)
  • Mugyema, M, Botha, C.D., Kamper, M.J., Wang, R-J., Sebitosi, A.B., "Levelised cost of storage comparison of energy storage systems for use
    in primary response application," Journal of Energy Storage, vol. 59, pp. 1--14, March 2023, Art no. 106573, doi: 10.1016/j.est.2022.106573
  • Schommarz, P.D., Wang, R-J., "Development of a transient synchronization analysis tool for line-start PM motors," Energies, vol. 15, no. 23,
    pp. 1--31, December 2022, Art no. 9206, doi: 10.3390/en15239206 (open access)
  • Tlali, P.M., Wang, R-J., "Prospect of PM vernier machine for wind power application," Energies, vol. 15, no. 13, pp. 1--26, July 2022, Art no.
    4912, doi: 10.3390/en15134912 (open access)
  • Idoko, H.C., Akuru, U.B., Wang, R-J., Popoola, O., "Potentials of brushless stator-mounted machines in electric vehicle drives - a literature review," World Electric Vehicle Journal, vol. 13, no. 5, pp. 1--26, May 2022, Art no. 93, doi: 10.3390/wevj13050093 (open access)
  • Pastellides, S., Gerber, S., Wang, R-J., Kamper, M.J., "Evaluation of drive cycle-based traction motor design strategies using gradient optimisation," Energies, vol. 15, no. 3, pp. 1--21, February 2022, Art no. 1095, doi: 10.3390/en15031095 (open access)
  • Botha, C.D., Kamper, M.J., Wang, R-J., "Design optimisation and cost analysis of linear vernier electric machine-based gravity energy storage systems," Journal of Energy Storage, vol. 44, part B, pp. 1--14, December 2021, Art no. 103397, doi: 10.1016/j.est.2021.103397
  • Palangar, M.F., Soong, W.L., Bianchi, N., Wang, R-J., "Design and optimisation techniques in performance improvement of line-start permanent magnet synchronous motors: a review," IEEE Transactions on Magnetics, vol. 57, no. 9, pp. 1--14, September 2021, Art no.
    900214, doi: 10.1109/tmag.2021.3098392
  • Botha, C.D., Kamper, M.J., Wang, R-J. and Chama, A., "Analytical modelling of surface-mounted and consequent-pole linear Vernier hybrid machines," IEEE Access, vol. 9, pp. 26251--26259, February 2021; doi: 10.1109/access.2021.3057716 (open access)
  • Tlali, P.M., Wang, R-J., Gerber, S., Botha, C.D., Kamper, M.J., "Design and performance comparison of Vernier and conventional PM synchronous wind generators," IEEE Transactions on Industry Applications, vol. 56, no. 3, pp. 2570--2579, May/Jun 2020; doi: 10.1109/ tia.2020.2979111 (PDF)
  • 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, September-October 2018; doi: 10.1109/tia.2018.2834306 (PDF)
  • 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 (open access)
  • Gerber, S., Wang, R-J., "Cogging torque definitions of magnetic gears and magnetically geared machines," IEEE Transactions on Magnetics, vol. 54, no. 4, pp. 1--9, April 2018, Art no. 8103209; doi: 10.1109/tmag.2017.2784823 (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, pp. 1--8, January 2018, Art no. 7400108; doi: 10.1109/tmag.2017.2761319 (PDF)
  • 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; doi: 10.23919/saiee.2017.8531928 (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, pp. 1--5, 2016, Art no. 1303805; doi: 10.1109/lmag.2016.2564948 (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, pp. 1--10, February 2016, Art no. 8100610; doi: 10.1109/tmag.2015.2487886 (PDF)
  • 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)
  • Gerber, S., Wang, R-J., "Design and evaluation of a magnetically geared PM machine," IEEE Transactions on Magnetics, vol. 51, no. 8,
    pp. 1--10, August 2015, Art no. 8107010; doi: 10.1109/tmag.2015.2421474 (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, pp. 1--6, February 2015, Art no. 7400206; doi: 10.1109/tmag.2014.2351787 (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 (PDF)
  • 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 (PDF)
  • 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 (PDF)
  • 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; doi: 10.23919/saiee.2006. 9488021 (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 (PDF)
  • 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 (PDF)
  • 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 (PDF)
  • Wang, R-J., Mohellebi, H., Flack, T.J., Kamper, M.J., Buys, J.D., Feliachi, M., "Two-dimensional Cartesian air-gap element (CAGE) for dynamic finite-element modeling of electrical machines with a flat air gap," IEEE Transactions on Magnetics, vol. 38, no. 2, pp. 1357--1360, March 2002; doi: 10.1109/20.996024 (PDF)
  • 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 (ISSN 0257-9669) (Silver medal prize 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 (ISSN 1223 - 057X)
  • 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

  • Oosthuizen, P.S., Kamper, M.J., Wang, R-J., "Evaluation of small-scale permanent magnet wind generators for direct battery charging.", 2025 IEEE IAS Annual Meeting Incorporating the Industrial & Commercial Power Systems Asia Conference, New Taipei City, Taiwan, 15-20 June 2025, pp. 1--8 (accepted)
  • Mugyema, M., Kamper, M.J., Wang, R-J., "Design and prototyping of a linear permanent magnet flux switching machine for energy storage application.", 2025 International Aegean Conference on Electrical Machines and Power Electronics, (ACEMP) & 2025 International Conference on Optimization of Electrical and Electronic Equipment, (OPTIM), Timisoara, Romania, 14-16 May 2025, pp. 1--6
  • Eichin, F., Kamper, M.J., Gerber, S., Wang, R-J., "On the effect of permanent magnet eddy currents during dynamic short-circuits in traction motors", International Conference on Electrical Machines, (ICEM), Torino, Italy, 1-4 Sept. 2024, 6p, doi: 10.1109/ICEM60801.2024.10700273
  • Guo, L., Lu, Y., Li, J., Wang, R-J., "Semi-analytical calculation of AC copper loss in flat wire windings considering PWM harmonics", International Conference on Electrical Machines, (ICEM), Torino, Italy, 1-4 Sept. 2024, pp. 1--7, doi: 10.1109/ICEM60801.2024.10700059
  • Arish, N., Kamper, M.J., Wang, R-J., "Optimization and comparative analysis of magnet shapes in 5 MW PMVMs for marine propulsion", International Conference on Electrical Machines, (ICEM), Torino, Italy, 1-4 Sept. 2024, pp. 1--7, doi: 10.1109/ICEM60801.2024.10700532
  • Teymoori, V., Dastres, H., Kamper, M.J., Wang, R-J., "Improved fixed time sliding mode observer for sensorless operation of permanent magnet synchronous generator wind turbine", IEEE Canadian Conference on Electrical and Computer Engineering, (CCECE), Kingston, ON, Canada, 6-9 August 2024, pp. 56--61, doi: 10.1109/CCECE59415.2024.10667340
  • Arish, N., Dramat, A.Z., Kamper, M.J., Wang, R-J., Phumudzo, M., "Design and optimization of fractional slot concentrated winding PM
    vernier motor," Proc. of the 32nd Southern African Universities Power Engineering Conference, (SAUPEC), pp. 1--6, 24-25 January 2024,
    Stellenbosch, doi: 10.1109/saupec60914.2024.10445038 (PDF)
  • Arish, N., Teymoori, V., Dube, L., Kamper, M.J., Wang, R-J., "Comparative analysis of PM and non-PM design options for small-scale wind generators," Proc. of the 32nd Southern African Universities Power Engineering Conference, (SAUPEC), pp. 1--6, 24-25 January 2024,
    Stellenbosch, doi: 10.1109/saupec60914.2024.10445083 (PDF)
  • Teymoori, V., Kamper, M.J., Garner, G., Wang, R-J., "Comparison of sensorless control methods of PMSM ship propulsion drives", International Conference on Electrical, Computer, and Energy Technologies, (ICECET), Cape Town, 16-17 November 2023, pp. 1--7, doi: 10.1109/icecet58911.2023.10389590
  • Dube, L., Kamper, M.J., Ockhuis, D., Garner, K., Wang, R-J., "On-shore battery-storage strong-grid-forming wind generator systems", 26th International Conference on Electrical Machines and Systems, (ICEMS), Zhuhai, China, 5-8 November 2023, pp. 5348--5353, doi: 10.1109/icems59686.2023.10344488 (Best paper prize)
  • Mugyema, M., Kamper, M.J., Wang, R-J., "Design options and considerations of a linear flux switching machine for dry gravity energy storage", 26th International Conference on Electrical Machines and Systems, (ICEMS), Zhuhai, China, 5-8 November 2023, pp. 5053--5057, doi: 10.1109/icems59686.2023.10344987
  • Arish, N., Kamper, M.J., Wang, R-J., "Performance of large low-pole-ratio non-overlap-winding PM vernier motor", 26th International Conference on Electrical Machines and Systems, (ICEMS), Zhuhai, China, 5-8 November 2023, pp. 5255--5260, doi: 10.1109/icems59686.2023.10344936
  • Teymoori, V., Ghalebani, P., Kamper, M.J., Wang, R-J., "Sensorless adaptive PI control of high-power-propulsion PMSM based on sliding-mode extremum seeking algorithm", 26th International Conference on Electrical Machines and Systems, (ICEMS), Zhuhai, China, 5-8 November 2023, pp. 5158--5163, doi: 10.1109/icems59686.2023.10345350
  • Teymoori, V., Dastres, H., Kamper, M.J., Wang, R-J., Arish, N., "Sensorless control of DTP-PMSM ship-propulsion drives by using nonsingular fast terminal sliding mode observer", 26th International Conference on Electrical Machines and Systems, (ICEMS), Zhuhai, China, 5-8 November 2023, pp. 4257--4262, doi: 10.1109/icems59686.2023.10344422
  • Eichin, F., Kamper, M.J., Gerber, S., Wang, R-J., "Accurate prediction of three-phase short-circuit currents of PM synchronous machines", International Conference on Power Electronics, Machines and Drives, (PEMD), Brussels, Belgium, 23-24 October 2023, pp. 394--401, doi: 10.1049/icp.2023.2028
  • Arish, N., Kamper, M.J., Wang, R-J., "Performance comparison of 5-MW normal and dual three-phase PM vernier motors for ship propulsion", 2023 International Aegean Conference on Electrical Machines and Power Electronics, (ACEMP) & 2023 International Conference on Optimization of Electrical and Electronic Equipment, (OPTIM), Istanbul, Turkiye, 1-3 September 2023, pp. 1--8, doi: 10.1109/acemp-optim57845.2023.10287025
  • Teymoori, V., Dastres, H., Kamper, M.J., Wang, R-J., Arish, N., "Enhanced fast terminal sliding mode observer for wide-speed sensorless control of PM vernier ship propulsion machine drives", 2023 International Aegean Conference on Electrical Machines and Power Electronics, (ACEMP) & 2023 International Conference on Optimization of Electrical and Electronic Equipment, (OPTIM), Istanbul, Turkiye, 1-3 Sept. 2023, pp. 1--7, doi: 10.1109/acemp-optim57845.2023.10287020
  • Mugyema, M., Kamper, M.J., Wang, R-J., "Design optimisation of a linear wound field flux switching machine for dry gravity energy storage", 14th International Symposium on Linear Drives for Industry, (LDIA), Hannover, Germany, 28-30 June 2023, pp. 1--5, doi: 10.1109/ldia59564.2023.10297529
  • Mugyema, M., Kamper, M.J., Wang, R-J., "Design and evaluation of a linear permanent magnet flux switching machine for use in dry gravity energy storage", 2023 IEEE International Magnetic Conference, (INTERMAG), Sendai, Japan, 15-19 May 2023, pp. 1--5, doi: 10.1109/ intermag50591.2023.10265013
  • Mugyema, M., Kamper, M.J., Wang, R-J., "Performance evaluation of a linear vernier hybrid machine for use in dry gravity storage," 2022 International Conference on Electrical Machines, (ICEM), Valencia, Spain, 5-8 September 2022, pp. 1675--1681, doi: 10.1109/icem51905.2022.9910727
  • Mugyema, M., Rabadia, M.M., Botha, C.D., Kamper, M.J., Wang, R-J., "Design and control of a linear electric machine based gravity energy storage system," 30th Southern African Universities Power Engineering Conference, (SAUPEC), 25-27 January 2022, Durban, pp. 1--8; doi: 10.1109/saupec55179.2022.9730745
  • Wu, L., Li, J., Lu, Y., Wang, R-J., He, K., Wang, H., Sun, J., "Research and experimental evaluation on the control strategy of the linear induction motor for Maglev", 13th International Symposium on Linear Drives for Industry, (LDIA), Wuhan, China, July 2021, pp. 1--6, doi: 10.1109/ldia49489.2021.9505797
  • Arish, N., Kamper, M.J., Wang, R-J., "Electromagnetic analysis of flux barrier U-shaped permanent magnet Vernier motor," 2021
    International Aegean Conference on Electrical Machines and Power Electronics    , (ACEMP) & 2021 International Conference on
    Optimization of Electrical and Electronic Equipment    , (OPTIM), 2-3 September 2021, Brasov, Romania, pp. 198--204; doi: 10.1109/optim-acemp50812.2021.9590067 (PDF)
  • Du Plessis, F., Pastellides, S.G., Wang, R-J., "Design and comparison of three surface-mounted PM motors for a light electric vehicle," 2021 Southern African Universities Power Engineering Conference/Robotics and Mechatronics/Pattern Recognition Association of South Africa, (SAUPEC/RobMech/PRASA), Potchefstroom, South Africa, 2021, pp. 1--6; doi: 10.1109/saupec/robmech/prasa52254.2021.9377239 (PDF)
  • Tlali, P.M., Wang, R-J., "PM Vernier machine for utility scale wind generator applications: design and evaluation," Proc. of XXIV International Conference on Electrical Machines, (ICEM), pp.2637--2643, 23-26 August 2020, Gothenburg; doi: 10.1109/icem49940.2020.9270837 (PDF)
  • Gerber, S., Wang, R-J., "Traction motor optimization using mesh reshaping for gradient evaluation," Proc. of XXIV International Conference on Electrical Machines, (ICEM), pp. 2546--2552, 23-26 August 2020, Gothenburg, Sweden; doi: 10.1109/icem49940.2020.9270711 (PDF)
  • Pastellides, S.G., Gerber, S., Wang, R-J., Kamper, M.J., "Design of a surface-mounted PM motor for improved flux weakening performance," Proc. of XXIV International Conference on Electrical Machines, (ICEM), pp. 1772--1778, 23-26 August 2020, Gothenburg, Sweden; doi: 10.1109/icem49940.2020.9270671 (PDF)
  • Botha, C.D., Kamper, M.J., Wang, R-J., Sorgdrager, A.J., "Force ripple and cogging force minimisation criteria of single-sided consequent-pole linear vernier hybrid machines," Proc. of XXIV International Conference on Electrical Machines, (ICEM), pp. 469--475, 23-26 August 2020, Gothenburg, Sweden; doi: 10.1109/icem49940.2020.9270845 (PDF)
  • Sorgdrager, A.J., Wang, R-J, Grobler, A.J., "Robust torque ripple mitigation of a line-start PMSM by means of the Taguchi method," 2019
    Southern African Universities Power Engineering Conference/Robotics and Mechatronics/Pattern Recognition Association of South
    Africa, (SAUPEC/RobMech/PRASA)    , pp. 259--264, 28-30 January 2019, Bloemfontein; doi: 10.1109/robomech.2019.8704771 (PDF)
  • Gerber, S., Wang, R-J, "Reduction of inverter-induced shaft voltages using electrostatic shielding," 2019 Southern African Universities
    Power Engineering Conference/Robotics and Mechatronics/Pattern Recognition Association of South Africa, (SAUPEC/RobMech/PRASA)    , pp. 310--315, 28-30 January 2019, Bloemfontein; doi: 10.1109/robomech.2019.8704702 (PDF) (Best paper prize)
  • Masuku, T.M., Wang, R-J, Botha, M., Gerber, S., "Design strategy of traction induction motors," 2019 Southern African Universities Power Engineering Conference/Robotics and Mechatronics/Pattern Recognition Association of South Africa, (SAUPEC/RobMech/PRASA),
    pp. 316--321, 28-30 January 2019, Bloemfontein; doi: 10.1109/robomech.2019.8704761 (PDF)
  • Pastellides, S., Gerber, S., Wang, R-J., "Design strategy and comparison of four PM motor topologies for a 2 kW traction application," 2019
    Southern African Universities Power Engineering Conference/Robotics and Mechatronics/Pattern Recognition Association of South
    Africa, (SAUPEC/RobMech/PRASA)    , pp. 358--363, 28-30 January 2019, Bloemfontein; doi: 10.1109/robomech.2019.8704829 (PDF)
  • 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; doi: 10.1109/icelmach.2018.8506736 (PDF)
  • 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; doi: 10.1109/icelmach.2018.8506690 (PDF)
  • Tlali, P.M., Wang, R-J., Gerber, S., "Comparison of PM Vernier and conventional synchronous 15 kW wind generators," Proc. of XXIII International Conference on Electrical Machines, (ICEM), pp. 2065--2071, 3-6 September 2018, Alexandroupoli, Greece; doi: 10.1109/icelmach.2018.8506882 (PDF)
  • 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 January-1 February 2017, Stellenbosch (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, (SAUPEC), pp. 305--308, 30 January-1 February 2017, Stellenbosch (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 January-1 February 2017, Stellenbosch (PDF)
  • Gerber, S., Wang, R-J., "Statistical analysis of cogging torque considering various manufacturing imperfections," XXII International Conference
    on Electrical Machines, (ICEM)    , pp. 2066--2072, Lausanne, Switzerland, 4-7 September 2016; doi: 10.1109/icelmach.2016.7732807 (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 (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 (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 January 2016; doi: 10.13140/rg.2.1.4266.8560 (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 a 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 (PDF) (Best paper prize)
  • 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 (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 (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 (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 (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 (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 (PDF)
  • 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
  • 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.
  • 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 (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,
    pp. 203--207, 13-15 July 2011; doi: 10.13140/rg.2.2.32626.30400 (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 (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 (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 (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 (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 on Power Electronics and Drive Systems, (PEDS), Bangkok, Thailand, pp. 189--195, 27-30 November, 2007; doi: 10.1109/peds.2007.4487699
  • 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, 25-26 January 2007
  • 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.2007.383545
  • 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