access icon openaccess Design of an asymmetrical rotor for easy assembly and repair of field windings in synchronous machines

This study introduces a new asymmetrical rotor design for easy assembly and repair of field windings in synchronous machines. A new rotor geometry is adopted in order to simplify the manufacture and maintenance process of installing the rotor windings. The asymmetrical rotor design is simulated by the two-dimensional finite element analysis, and verified by experimental tests on a 27.5 kVA prototype machine. The proposed topology can drive down the maintenance and repair costs of the machine without impacting on the machine's electro-magnetic performance. This design will have significant economic implications for machine design and repair industry, especially for mass production markets such as wind turbines and engine-generators.

Inspec keywords: maintenance engineering; rotors; finite element analysis; synchronous machines; assembling

Other keywords: synchronous machine; apparent power 27.5 kVA; rotor geometry; maintenance process; field winding assembly; asymmetrical rotor design; repair industry; machine design; field winding repair; two-dimensional finite element analysis; prototype machine; mass production market

Subjects: Finite element analysis; Synchronous machines

References

    1. 1)
      • 7. Zhao, W., Chen, D., Lipo, T.A., et al: ‘Performance improvement of ferrite-assisted synchronous reluctance machines using asymmetrical rotor configurations’, IEEE Trans. Magn., 2015, 51, (11), pp. 14.
    2. 2)
      • 4. Stone, G.C., Culbert, I., Boulter, E.A., et al: ‘Salient pole rotor winding failure mechanisms and repair’, in ‘Electrical Insulation for Rotating Machines: Design, Evaluation, Aging, Testing, and Repair’ (Wiley-IEEE Press, Hoboken, NJ, USA, 2014), pp. 253263.
    3. 3)
    4. 4)
      • 9. Prieto, D., Dagusé, B., Dessante, P., et al: ‘Effect of magnets on average torque and power factor of synchronous reluctance motors’. 20012 IEEE XXth Int. Conf. Electrical Machines (ICEM), 2012.
    5. 5)
    6. 6)
      • 17. Aspden, H.: ‘Magnetic reluctance motor’. UK Patent GB2303255A, 1997.
    7. 7)
      • 10. Liu, W., Lipo, T.A.: ‘On saliency enhancement of salient pole wound field synchronous machines’. 2016 IEEE Energy Conversion Congress and Exposition (ECCE), 2016.
    8. 8)
    9. 9)
      • 16. Chitroju, R., Sadarangani, C.: ‘Phase shift method for radial magnetic force analysis in induction motors with non-skewed asymmetrical rotor slots’. IEEE Int. Electric Machines and Drives Conf., 2009 IEMDC'09, 2009.
    10. 10)
    11. 11)
    12. 12)
    13. 13)
      • 5. IEEE Std 1068-2015 (Revision of IEEE Std 1068-2009): ‘IEEE Standard for the Repair and Rewinding of AC Electric Motors in the Petroleum, Chemical, and Process Industries’, 2006.
    14. 14)
      • 8. Vartanian, R., Toliyat, H.A.: ‘Design and comparison of an optimized permanent magnet-assisted synchronous reluctance motor (PMa-SynRM) with an induction motor with identical NEMA Frame stators’. 2009 IEEE Electric Ship Technologies Symp., 2009, pp. 107112.
    15. 15)
    16. 16)
    17. 17)
      • 12. Liu, H.-C., Jeong, G., Ham, S.-h., et al: ‘Optimal rotor structure design of claw-pole alternator for performance improving using static 3D FEM coupled-circuit model’. 2016 IEEE Conf. Electromagnetic Field Computation (CEFC), 2016.
http://iet.metastore.ingenta.com/content/journals/10.1049/joe.2017.0123
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