The Potential for NdFeB Magnets in Electrical Machines and Other Permanent Magnet Excited Devices

  • D Howe
  • T S Birch
  • K J Mitchell

Abstract

The potential for NdFeB magnets in various categories and topologies of permanent magnet excited machine, for applications ranging from spindle-drives for machine tools to the electrodynamic braking of high-speed railway vehicles, as well as in other magnetic devices, has been examined. Design strategies and CAD procedures have been established for brushed dc motors, brushless dc and ac motors, line-start synchronous motors, hybrid stepper motors, and generators. In addition, finite element procedures have been implemented on an IBM PC to aid the design of permanent magnet devices in general. Theoretical designs have been validated against tests on a number of prototype units, some of which are being developed further to be launched as commercial products. The work undertaken under CEAM has indicated that there is little doubt thet NdFeB will become the material of choice for many future designs.

Keywords

Permanent Magnet Synchronous Motor Railway Vehicle NdFeB Magnet Prototype Motor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    Williams, I.J., Howe, D., Staton, D. and Birch, I.S.,:‘The design of a range of permanent magnet dc motors’, IFF Conf. Pub. 254, Elec Machines & Design & App. 1985, 270-274.Google Scholar
  2. 2.
    Williams, I.J., Birch, T.S., Howe, D., and Staton, D. : ‘Computer-aided design procedures for permanent magnet dc motors’, Proc. Controls/ Motors/Drives 85 Conf. 1985,29-35.Google Scholar
  3. 3.
    Staton, D.A., Birch, T.S., and Howe, D.: ‘Design optimisation of permanent magnet dc motors’, Proc. INCEMADS 86, Int. Conf. on Electrical Machines and Drive Systems, 1986.Google Scholar
  4. 4.
    Mitchell,J.L., Birch, T.S., and Howe, D.:‘Design and analysis of brushless dc motors’, Proc. INCEMADS 86, Int. Conf. on Electrical Machines & Drive Systems, 1986.Google Scholar
  5. 5.
    Jenkins, M.K., Birch, T.S., and Howe, D.:‘The influence of magnet mmf on static torgue production in hybrid stepper motors’, ibid, 1986.Google Scholar
  6. 6.
    Jenkins, M.K., Birch, T.S. and Howe, D.: ‘Static torque production in hybrid stepper motors: the influence of saturation and magnet mmf’, 3rd Int. Conf. on ‘Electrical Machines and Drives’, HE, London, Oct. 1987.Google Scholar
  7. 7.
    Chalmers, B.J., Devgan, S.K., Howe, D., and Low, WJ.:‘Synchronous performance predictions for high-field permanent magnet synchronous motors’, Proc. ICEM ’86, 1986, 1067-1070.Google Scholar
  8. 8.
    Howe, D., and Low, W.F.: ‘Methods for predicting steady-state operation of pm synchronous motors’, Proceedings UPEC, April 1987.Google Scholar
  9. 9.
    Howe, D., and Low, W.F.: ‘The finite element method for the direct simulation of the steady-state performance of a permanent magnet line-start synchronous motor’, Proc. IEEE Intermag Conference, Tokyo, April 1987 and IEEE Transactions on Magnetics, Sept. 1987.Google Scholar
  10. 10.
    Tan, G., Howe, D., and Birch, T.S.:‘Design and performance prediction of a permanent magnet air-turbo generator’, Proc. 2nd Int. Conf. on Small & Special Elec. Machines, I.E.E. Conf. Publication, 202, 125-128.Google Scholar
  11. 11.
    Howe, D., Matthews, D.M.H., Birch, T.S., Jablonski, A.P. and Rash, N.M.: ‘An electrodynamic braking system for railway vehicles based on an axle mounted permanent magnet alternator’, Paper W2. 5 presented at the 9th Int. Workshop on Rare-Earth Magnets, Bad Soden, Aug. 1987, 85–92.Google Scholar
  12. 12.
    Taylor, D., Manley, D.J., and Howe, D.:‘Workholdmg assemblies based on NdFeB permanent magnets’, 3rd Int. Conf. on ‘The impact of NdFeB materials on permanent magnet users, producers and raw material suppliers’, San Diego, California, Oct. 1987.Google Scholar
  13. 13.
    Howe, D., Birch, T.S., and Gray, P.: ‘The potential for NdFeB in electrical machines’, invited paper W2.1 presented at the 9th Int. Workshop on Rare-Earth Magnets, Bad Soden, Aug. 1987, 65–84.Google Scholar

Copyright information

© ECSC, EEC, EAEC, Brussels and Luxembourg 1989

Authors and Affiliations

  • D Howe
    • 1
  • T S Birch
    • 1
  • K J Mitchell
    • 1
  1. 1.Department of Electronic & Electrical EngineeringUniversity of SheffieldSheffieldEngland

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