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Evaluation of the Rotor Eddy-Current Losses in High-Speed PMSMs With a Shielding Cylinder for Different Stator Sources

Bert Hannon, Peter Sergeant (UGent) and Luc Dupré (UGent)
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Abstract
A continuous demand for more efficient and more compact drives is pushing the popularity of high-speed permanent magnet synchronous machines (PMSMs). However, high rotational speeds and extreme power densities imply that an appropriate cooling of the rotor may be difficult. This is all the more important because of the risk of demagnetization when permanent magnets are operated at high temperatures. Therefore, it is paramount to reduce the losses in the rotor of high-speed machines as much as possible. One technique to reduce the eddy-current losses is introducing a shielding cylinder, i.e., a conductive sleeve that is wrapped around the magnets. However, when badly designed, such a shielding cylinder may increase, rather than decrease, the losses. Therefore, an in-depth study of the effect of the shielding cylinder on the eddy-current losses in high-speed PMSMs is required. By studying how the eddy-current losses are affected by the shielding cylinder’s thickness and its conductivity, this paper aims at providing more insight in how the eddy-current losses can be reduced. Moreover, the study of the eddy-current losses is repeated for different stator sources to evaluate the importance of accounting for the actual control strategy during the machine’s design.
Keywords
Analytical models, eddy-current losses, electric machines, high-speed machine, shielding cylinder

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Citation

Please use this url to cite or link to this publication:

Chicago
Hannon, Bert, Peter Sergeant, and Luc Dupré. 2019. “Evaluation of the Rotor Eddy-Current Losses in High-Speed PMSMs With a Shielding Cylinder for Different Stator Sources.” IEEE Transactions on Magnetics 55 (3): 1–10.
APA
Hannon, B., Sergeant, P., & Dupré, L. (2019). Evaluation of the Rotor Eddy-Current Losses in High-Speed PMSMs With a Shielding Cylinder for Different Stator Sources. IEEE Transactions on Magnetics, 55(3), 1–10.
Vancouver
1.
Hannon B, Sergeant P, Dupré L. Evaluation of the Rotor Eddy-Current Losses in High-Speed PMSMs With a Shielding Cylinder for Different Stator Sources. IEEE Transactions on Magnetics. 2019;55(3):1–10.
MLA
Hannon, Bert, Peter Sergeant, and Luc Dupré. “Evaluation of the Rotor Eddy-Current Losses in High-Speed PMSMs With a Shielding Cylinder for Different Stator Sources.” IEEE Transactions on Magnetics 55.3 (2019): 1–10. Print.
@article{8625054,
  abstract     = {A continuous demand for more efficient and more compact drives is pushing the popularity of high-speed permanent magnet synchronous machines (PMSMs). However, high rotational speeds and extreme power densities imply that an appropriate cooling of the rotor may be difficult. This is all the more important because of the risk of demagnetization when permanent magnets are operated at high temperatures. Therefore, it is paramount to reduce the losses in the rotor of high-speed machines as much as possible. One technique to reduce the eddy-current losses is introducing a shielding cylinder, i.e., a conductive sleeve that is wrapped around the magnets. However, when badly designed, such a shielding cylinder may increase, rather than decrease, the losses. Therefore, an in-depth study of the effect of the shielding cylinder on the eddy-current losses in high-speed PMSMs is required. By studying how the eddy-current losses are affected by the shielding cylinder’s thickness and its conductivity, this paper aims at providing more insight in how the eddy-current losses can be reduced. Moreover, the study of the eddy-current losses is repeated for different stator sources to evaluate the importance of accounting for the actual control strategy during the machine’s design.},
  articleno    = {8101010},
  author       = {Hannon, Bert and Sergeant, Peter and Dupré, Luc},
  issn         = {0018-9464},
  journal      = {IEEE Transactions on Magnetics},
  keywords     = {Analytical models,eddy-current losses,electric machines,high-speed machine,shielding cylinder},
  language     = {eng},
  number       = {3},
  pages        = {8101010:1--8101010:10},
  title        = {Evaluation of the Rotor Eddy-Current Losses in High-Speed PMSMs With a Shielding Cylinder for Different Stator Sources},
  url          = {http://dx.doi.org/10.1109/tmag.2018.2890266},
  volume       = {55},
  year         = {2019},
}

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