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Efficiency trends in electric machines and drives

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  • Mecrow, B.C.
  • Jack, A.G.

Abstract

Almost all electricity in the UK is generated by rotating electrical generators, and approximately half of it is used to drive electrical motors. This means that efficiency improvements to electrical machines can have a very large impact on energy consumption. The key challenges to increased efficiency in systems driven by electrical machines lie in three areas: to extend the application of variable-speed electric drives into new areas through reduction of power electronic and control costs; to integrate the drive and the driven load to maximise system efficiency; and to increase the efficiency of the electrical drive itself. In the short to medium term, efficiency gains within electrical machines will result from the development of new materials and construction techniques. Approximately a quarter of new electrical machines are driven by variable-speed drives. These are a less mature product than electrical machines and should see larger efficiency gains over the next 50 years. Advances will occur, with new types of power electronic devices that reduce switching and conduction loss. With variable-speed drives, there is complete freedom to vary the speed of the driven load. Replacing fixed-speed machines with variable-speed drives for a high proportion of industrial loads could mean a 15-30% energy saving. This could save the UK 15 billion kWh of electricity per year which, when combined with motor and drive efficiency gains, would amount to a total annual saving of 24 billion kWh.

Suggested Citation

  • Mecrow, B.C. & Jack, A.G., 2008. "Efficiency trends in electric machines and drives," Energy Policy, Elsevier, vol. 36(12), pages 4336-4341, December.
  • Handle: RePEc:eee:enepol:v:36:y:2008:i:12:p:4336-4341
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    References listed on IDEAS

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    1. Gibbins, Jon & Chalmers, Hannah, 2008. "Preparing for global rollout: A `developed country first' demonstration programme for rapid CCS deployment," Energy Policy, Elsevier, vol. 36(2), pages 501-507, February.
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    Cited by:

    1. Hasanuzzaman, M. & Rahim, N.A. & Saidur, R. & Kazi, S.N., 2011. "Energy savings and emissions reductions for rewinding and replacement of industrial motor," Energy, Elsevier, vol. 36(1), pages 233-240.
    2. repec:eee:appene:v:207:y:2017:i:c:p:624-633 is not listed on IDEAS
    3. Saidur, R., 2010. "A review on electrical motors energy use and energy savings," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(3), pages 877-898, April.
    4. Milad Maralani & Milad Maralani & Basil Sharp & Golbon Zakeri, 2016. "The Potential Impact of Industrial Energy Savings on The New Zealand Economy," EcoMod2016 9308, EcoMod.
    5. repec:eee:rensus:v:79:y:2017:i:c:p:970-983 is not listed on IDEAS
    6. Du Plessis, Gideon Edgar & Liebenberg, Leon & Mathews, Edward Henry, 2013. "The use of variable speed drives for cost-effective energy savings in South African mine cooling systems," Applied Energy, Elsevier, pages 16-27.
    7. Abdelaziz, E.A. & Saidur, R. & Mekhilef, S., 2011. "A review on energy saving strategies in industrial sector," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(1), pages 150-168, January.
    8. Saidur, R. & Rahim, N.A. & Ping, H.W. & Jahirul, M.I. & Mekhilef, S. & Masjuki, H.H., 2009. "Energy and emission analysis for industrial motors in Malaysia," Energy Policy, Elsevier, vol. 37(9), pages 3650-3658, September.
    9. Thirugnanasambandam, M. & Hasanuzzaman, M. & Saidur, R. & Ali, M.B. & Rajakarunakaran, S. & Devaraj, D. & Rahim, N.A., 2011. "Analysis of electrical motors load factors and energy savings in an Indian cement industry," Energy, Elsevier, vol. 36(7), pages 4307-4314.
    10. Alireza Rasekh & Peter Sergeant & Jan Vierendeels, 2016. "Development of Correlations for Windage Power Losses Modeling in an Axial Flux Permanent Magnet Synchronous Machine with Geometrical Features of the Magnets," Energies, MDPI, Open Access Journal, vol. 9(12), pages 1-17, November.
    11. Saidur, R. & Mahlia, T.M.I., 2010. "Energy, economic and environmental benefits of using high-efficiency motors to replace standard motors for the Malaysian industries," Energy Policy, Elsevier, vol. 38(8), pages 4617-4625, August.
    12. Sola, Antonio Vanderley Herrero & Mota, Caroline Maria de Miranda & Kovaleski, João Luiz, 2011. "A model for improving energy efficiency in industrial motor system using multicriteria analysis," Energy Policy, Elsevier, vol. 39(6), pages 3645-3654, June.
    13. Saidur, R. & Rahim, N.A. & Hasanuzzaman, M., 2010. "A review on compressed-air energy use and energy savings," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(4), pages 1135-1153, May.
    14. Saidur, R., 2009. "Energy consumption, energy savings, and emission analysis in Malaysian office buildings," Energy Policy, Elsevier, vol. 37(10), pages 4104-4113, October.

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