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Permanent-Magnet A.C. and D.C. Machines

  • B. J. Chalmers
  • E. Spooner
  • A. M. Sitzia
  • K. M. Richardson

Abstract

Design analysis procedures have been developed and validated for permanent-magnet synchronous motors. The potential for exploitation of the properties of Nd-Fe-B is demonstrated by design, construction and evaluation of alternative SmCo5 and Nd-Fe-B rotors in a 7.5 kW machine, showing the performance advantages of the latter material.

The high-field properties of Nd-Fe-B raises the feasibility of slotless-stator brushless d.c. machines. Design approaches to the effective utilisation of magnets in such machines are developed and verified by construction and testing of an experimental machine. This is shown to yield an advantageous reduction of torque pulsation.

Problems of large permanent-magnet machines have been approached by study of new methods of in-situ magnetisation. Results obtained from an experimental magnetiser are reported, with a view to their application in production of a prototype 200kW motor.

Keywords

Induction Motor Electrical Machine Rotor Position Experimental Machine Torque Ripple 
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. Brown, J.E. and Chalmers, B.J. 1988 Locus diagrams and performance characteristics of various types of synchronous motor. Intern. Conf. on Electrical Machines, Pisa.Google Scholar
  2. Chalmers, B.J., Devgan, S.K., Howe, D. and Low, W.F. 1986. Synchronous performance prediction for high-field permanent-magnet synchronous motors. Intern. Conf. on Electrical Machines, Munich.Google Scholar
  3. Chalmers, B.J. and Devgan, S.K. 1988. Assessment of high-field permanent-magnet rotors by measurement of flux distribution in air. Intern. Conf. on Electrical Machines, Pisa.Google Scholar
  4. Chalmers, B.J. and Devgan, S.K. 1988. Comparative performances of 7.5 kW permanent-magnet synchronous motors with SmCo5 and Nd-Fe-B magnets. Intern. Conf. on Electrical Machines, Pisa.Google Scholar
  5. Chalmers, B.J., Hamed, S.A. and Baines, G.D. 1985. Parameters and performance of a high-field permanent-magnet synchronous motor for variable-frequency operation. I. E.E Proc. 132, Pt.B, No.3, 117-124.Google Scholar
  6. Hanitsch, R., Sitzia, A.M., Hemead, E. and Chalmers, B.J. 1988. Improved brushless motors with cup-type winding and Nd-Fe-B magnets. Intern. Conf. on Electrical Machines, Pisa.Google Scholar
  7. Howe, D., Rash, N.M. and Spooner, E. 1985. A permanent-magnet alternator for use as an electro-dynamic brake. I.E.E Conf. on Electrical Machine Design and Application, London.Google Scholar
  8. Richardson, K.M. and Spooner, E. 1987. Magnetisation procedures for Nd-Fe-B magnets in large electrical machines. I.E.E. Intern. Conf. on Electrical Machines and Drives, London.Google Scholar
  9. Sitzia, A.M. and Chalmers, B.J. 1987. Brushless d.c. motors with slotless stator. Electrical Drive Symposium, Cagliari.Google Scholar
  10. Sitzia, A.M. and Chalmers, B.J. 1987. Electromagnetic design of brushless d.c. motor with slotless stator. I.E.E. Intern. Conf. on Electrical Machines and Drives, London.Google Scholar
  11. Spooner, E. and Chalmers, B.J. 1988. Toroidally-wound, axial-flux, permanentmagnet brushless d.c. motors. Intern. Conf. on Electrical Machines, Pisa.Google Scholar
  12. Spooner, E. and Richardson, K.M. 1987. The properties of permanent-magnet materials for the excitation of large electrical machines, Electrical Drive Symposium, Cagliari.Google Scholar

Copyright information

© ECSC, EEC, EAEC, Brussels and Luxembourg 1989

Authors and Affiliations

  • B. J. Chalmers
    • 1
  • E. Spooner
    • 1
  • A. M. Sitzia
    • 1
  • K. M. Richardson
    • 1
  1. 1.Department of Electrical Engineering and ElectronicsUniversity of Manchester Institute of Science and TechnologyManchesterUK

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