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Use of canned rotors in high-field permanent magnet machines

Use of canned rotors in high-field permanent magnet machines

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© The Institution of Electrical Engineers
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The design of high speed permanent magnet machines needs to address conflicting requirements arising from the requirements of high electromechanical efficiency and mechanical strength and smoothness of running. This paper investigates the use of canning material surrounding the rotor, to give it mechanical strength, and investigates its consequences with regard to the electromagnetic performance of the motor at high speeds. Two designs are investigated in detail. The performance of a high-field magnet configuration is assessed experimentally, and compares well with the results predicted from finite-element computations.

Inspec keywords: rotors; finite element analysis; permanent magnet machines

Other keywords: mechanical strength; high-field permanent magnet machines; canned rotors; finite-element computations; running smoothness; electromechanical efficiency

Subjects: a.c. machines; d.c. machines; Finite element analysis

References

    1. 1)
      • E. Richter . Rare earth-cobalt permanent magnets for electrical machines of medium to large power rations. Goldsmidt Technical Bulletin , 50 - 57
    2. 2)
      • K.J. Binns , T.M. Wong . Analysis and performance of a high-field permanent-magnet synchronous machine. IEE Proc. B. , 6
    3. 3)
      • R. Schifer , T.A. Lipo . Core loss in buried magnet permanent magnet synchronous motors. IEEE Trans. , 2 , 279 - 284
    4. 4)
      • Binns, K.J., Chaaban, F.B., Lisboa, P.J.G., Mellor, P.H.: `The role of neodymium-iron-boron in relation to other materials for permanent magnet machines', Presented at Conference on Electrical machines and drives, 1987, London.
    5. 5)
      • Binns, K.J., Hameed, A.A.K., Chaaban, F.B.: `A canned solid rotor permanent magnet machine with skewed-radial neodymium-iron-boron magnets', Proceedings of International Conference on Electrical machines and drives, 1989, London.
    6. 6)
      • A.G. Armstron , C.S. Biddlecombe . Enhancement to the PE2D package. IEEE Trans. , 2 , 411 - 415
    7. 7)
      • Binns, K.J., Jabbar, M.A., Parry, G.E., Russell, S.W.: `A variable speed drive using a permanent magnet A.C. motor', Proceedings of 2nd International Conference on Electrical variable-speed drives, 1979, London.
    8. 8)
      • Mellor, P.H., Binns, K.J., Al-Taee, M.: `Ultrasonically moduated drive system incorporation PM machine', Proceedings of 3rd International Conference on Power electronics and variable speed drives, 1988, London.
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