Publications

Journal Papers

  • M. Johnson, M. C. Gardner, and H. A. Toliyat, “A Parameterized Linear 3D Magnetic Equivalent Circuit for Analysis and Design of Radial Flux Magnetic Gears–Part I: Implementation,” IEEE. Trans. Energy Convers., early access on IEEE Xplore. (pdf) (IEEE Xplore)
  • M. Johnson, M. C. Gardner, and H. A. Toliyat, “A Parameterized Linear 3D Magnetic Equivalent Circuit for Analysis and Design of Radial Flux Magnetic Gears–Part II: Evaluation,” IEEE. Trans. Energy Convers., early access on IEEE Xplore. (pdf) (IEEE Xplore)
  • M. C. Gardner, B. Praslicka, M. Johnson, and H. A. Toliyat, “Optimization of Coaxial Magnetic Gear Design and Magnet Material Grade at Different Temperatures and Gear Ratios,” IEEE. Trans. Energy Convers., vol. 36, no. 3, pp. 2493-2501, Sep. 2021. (pdf) (IEEE Xplore)
  • B. Praslicka, M. C. Gardner, M. Johnson, and H. A. Toliyat, “Review and Analysis of Coaxial Magnetic Gear Pole Pair Count Selection Effects,” IEEE Trans. Emerg. Sel. Topics Power Electron., early access on IEEE Xplore. (pdf) (IEEE Xplore)
  • M. C. Gardner, M. Johnson, and H. A. Toliyat, “Analysis of High Gear Ratio Capabilities for Single-Stage, Series Multistage, and Compound Differential Coaxial Magnetic Gears,” IEEE. Trans. Energy Convers., vol. 34, no. 2, pp. 665-672, Jun. 2019. (pdf) (IEEE Xplore)
  • A. K. Morya, M. C. Gardner, B. Anvari, L. Liu, A. G. Yepes, J. Doval-Gandoy, and H. A. Toliyat, “Wide Bandgap Devices in AC Electric Drives: Opportunities and Challenges,” IEEE Trans. Transport. Electrific., vol. 5, no. 1, pp. 3-20, Mar. 2019. (pdf) (IEEE Xplore)
  • M. C. Gardner, M. Johnson, and H. A. Toliyat, “Comparison of Surface Permanent Magnet Axial and Radial Flux Coaxial Magnetic Gears,” IEEE. Trans. Energy Convers., vol. 34, no. 4, pp. 2250-2259, Dec. 2018. (pdf) (IEEE Xplore)
  • M. Johnson, M. C. Gardner, H. A. Toliyat, S. Englebretson, W. Ouyang, and C. Tschida, “Design, Construction, and Analysis of a Large Scale Inner Stator Radial Flux Magnetically Geared Generator for Wave Energy Conversion,” IEEE. Trans. Ind. Appl., vol. 54, no. 4, pp. 3304 – 3314, Jul.-Aug. 2018. (pdf) (IEEE Xplore)
  • M. C. Gardner, B. E. Jack, M. Johnson, and H. A. Toliyat, “Comparison of Surface Mounted Permanent Magnet Coaxial Radial Flux Magnetic Gears Independently Optimized for Volume, Cost, and Mass,” IEEE. Trans. Ind. Appl., vol. 54, no. 3, pp. 2237-2245, May-Jun. 2018. (pdf) (IEEE Xplore)
  • M. Johnson, M. C. Gardner, and H. A. Toliyat, “A Parameterized Linear Magnetic Equivalent Circuit for Analysis and Design of Radial Flux Magnetic Gears – Part I: Implementation,” IEEE Trans. Energy Convers., vol. 33, no. 2, pp. 784-791, Jun. 2018. (pdf) (IEEE Xplore)
  • M. Johnson, M. C. Gardner, and H. A. Toliyat, “A Parameterized Linear Magnetic Equivalent Circuit for Analysis and Design of Radial Flux Magnetic Gears – Part II: Evaluation,” IEEE Trans. Energy Convers., vol. 33, no. 2, pp. 792-800, Jun. 2018. (pdf) (IEEE Xplore)
  • M. Johnson, M. C. Gardner, and H. A. Toliyat, “Design Comparison of NdFeB and Ferrite Radial Flux Surface Permanent Magnet Coaxial Magnetic Gears,” IEEE Trans. Ind. Appl., vol. 54, no. 2, pp. 1254-1263, Mar.-Apr. 2018. (pdf) (IEEE Xplore)
  • M. Johnson, M. C. Gardner, and H. A. Toliyat, “Design and Analysis of an Axial Flux Magnetically Geared Generator,” IEEE Trans. Ind. Appl., vol. 53, no. 1, pp 97-105, Jan.-Feb. 2017. (pdf) (IEEE Xplore)

Conference Papers

  • A. Daniar and M. C. Gardner, “Investigation of a Multiphase Winding Arrangement for Mitigating Short-Circuit Fault Currents”, in Proc. IEEE Int. Symp. Diagnostics for Elec. Mach. Power Electronics and Drives, 2021, pp. 1-6. (pdf) *Prize Paper Award
  • S. Hasanpour, S. Sheshaprasad, M. C. Gardner, M. Johnson, B. Praslicka, and H. A. Toliyat, “Design and Control of a Fault Tolerant Permanent Magnet Motor with Independently Optimized Phase and Pole Counts”, in Proc. IEEE Int. Symp. Diagnostics for Elec. Mach. Power Electronics and Drives, 2021, pp. 1-7. (pdf)
  • B. Praslicka, M. Johnson, D. Zamarron, A. Marshall, S. Hasanpour, M. C. Gardner, A. Nguyen, A. Goodarzi, E. Bauk, and H. A. Toliyat, “Practical Analysis and Design of a 50:1 Cycloidal Magnetic Gear with Balanced Off-Axis Moments and a High Specific Torque for Lunar Robots” in Proc. IEEE Int. Elect. Mach. and Drives Conf., 2021, pp. 1-8. (pdf) (IEEE Xplore)
  • D. Talebi, M. C. Gardner, S. V. Sankarraman, A. Daniar, and H. A. Toliyat, “Electromagnetic Design Characterization of a Dual Rotor Axial Flux Motor for Electric Aircraft,” in Proc. IEEE Int. Elect. Mach. and Drives Conf., 2021, pp. 1-8. (pdf) (IEEE Xplore)
  • S. Hasanpour, M. C. Gardner, M. Johnson, and H. A. Toliyat, “Comparison of Reluctance and Surface Permanent Magnet Coaxial Magnetic Gears,” in Proc. IEEE Energy Convers. Congr. and Expo, 2020, pp. 307-314. (pdf) (IEEE Xplore)
  • B. Praslicka, M. Johnson, M. C. Gardner, E. Dangtran and H. A. Toliyat, “Effects of Axial Flux Magnetic Gear Misalignment,” in Proc. IEEE Energy Convers. Congr. and Expo, 2020, pp 293-300. (pdf) (IEEE Xplore)
  • M. C. Gardner, M. Johnson, and H. A. Toliyat, “Performance Impacts of Practical Fabrication Tradeoffs for a Radial Flux Coaxial Magnetic Gear with Halbach Arrays and Air Cores,” in Proc. IEEE Energy Convers. Congr. and Expo, 2019, pp. 3129-3136. (pdf) (IEEE Xplore)
  • M. C. Gardner, Y. Zhang, D. Talebi, H. A. Toliyat, A. Crapo, P. Knauer, and H. Willis, “Loss Breakdown of a Dual Conical Rotor Permanent Magnet Motor using Grain Oriented Electrical Steel and Soft Magnetic Composites,” in Proc. IEEE Int. Elect. Mach. and Drives Conf., 2019, pp 1067-1074. (pdf) (IEEE Xplore)
  • M. C. Gardner and H. A. Toliyat, “Nonlinear Analysis of Magnetic Gear Dynamics Using Superposition and Conservation of Energy,” in Proc. IEEE Int. Elect. Mach. and Drives Conf., 2019, pp 210-217. (pdf) (IEEE Xplore)
  • M. C. Gardner, M. Johnson, and H. A. Toliyat, “Comparison of Surface Permanent Magnet Coaxial and Cycloidal Radial Flux Magnetic Gears,” in Proc. IEEE Energy Convers. Congr. and Expo, 2018, pp. 5005-5012. (pdf) (IEEE Xplore)
  • M. C. Gardner, D. A. Janak, and H. A. Toliyat, “A Parameterized Linear Magnetic Equivalent Circuit for Air Core Radial Flux Coaxial Magnetic Gears with Halbach Arrays,” in Proc. IEEE Energy Convers. Congr. and Expo, 2018, pp. 2351-2358. (pdf) (IEEE Xplore)
  • M. Johnson, M. C. Gardner, H. A. Toliyat, S. Englebretson, W. Ouyang, and C. Tschida, “Design, Construction, and Analysis of a Large Scale Inner Stator Radial Flux Magnetically Geared Generator for Wave Energy Conversion,” in Proc. IEEE Energy Convers. Congr. and Expo, 2017, pp. 5017-5024. (pdf) (IEEE Xplore)
  • M. C. Gardner, B. E. Jack, M. Johnson, and H. A. Toliyat, “Comparison of Coaxial Radial Flux Magnetic Gears Independently Optimized for Volume, Cost, and Mass,” in Proc. IEEE Int. Elect. Mach. and Drives Conf., 2017, pp. 1-8. (pdf) (IEEE Xplore)
  • A. Morya, M. Moosavi, M. C. Gardner, and H. A. Toliyat, “Applications of Wide Bandgap (WBG) Devices in AC Electric Drives: A Technology Status Review,” in Proc. IEEE Int. Elect. Mach. and Drives Conf., 2017, pp. 1-8. (pdf) (IEEE Xplore)
  • M. Johnson, M. C. Gardner, and H. A. Toliyat, “Design Comparison of NdFeB and Ferrite Radial Flux Magnetic Gears,” in Proc. IEEE Energy Convers. Congr. and Expo., 2016, pp. 1-8. (pdf) (IEEE Xplore)
  • M. Johnson, M. C. Gardner, and H. A. Toliyat, “Design and Analysis of an Axial Flux Magnetically Geared Generator,” in Proc. IEEE Energy Convers. Congr. and Expo., 2015, pp. 6511-6518. (pdf) (IEEE Xplore) *Prize Paper Award
  • M. Johnson, M. C. Gardner, and H. A. Toliyat, “Analysis of Axial Field Magnetic Gears with Halbach Arrays,” in Proc. IEEE Int. Elect. Mach. and Drives Conf., 2015, pp 108-114. (pdf) (IEEE Xplore)

Patents

  • US Patent: Method and apparatus for compact axial flux magnetically geared machines, H. A. Toliyat, M. Johnson, M. C. Gardner, US20170104388, Apr. 13, 2017.

Books and Chapters

  • Chapter: H. A. Toliyat, M. Johnson, M. C. Gardner, “Magnetic Gears and Magnetically Geared Machines: An Alternative Compact and Reliable Solution for High-Torque, Low-Speed Systems”, in Compendium on Electromagnetic Analysis, vol. 2: World Scientific, 2020.

Webinar

  • H. A. Toliyat, M. C. Gardner, and M. Johnson, “Motivation for magnetic gears and magnetically geared machines,” Nov. 1, 2017.

Tutorial

  • H. A. Toliyat, M. Johnson, and M. C. Gardner, “Non-Contact Magnetic Gears and Magnetically Geared Machines: Operating Principles, Design Considerations, and Applications”, IEMDC 2021.