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access icon openaccess Torque optimisation of seven-phase BLDC machines in normal and degraded modes with constraints on current and voltage

This is an open access article published by the IET under the Creative Commons Attribution-NonCommercial-NoDerivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/)
Received 22/06/2018, Accepted 27/07/2018, Published 22/01/2019

This study proposes several easy-to-implement control strategies when seven-phase axial flux brushless DC machines with trapezoidal back electromotive forces operate in normal and faulty modes by taking into account constraints on voltage and current. The constraints are related to the converter and machine design in terms of maximum values of current and voltage. The considered faults are cases in which one or two phases of the machine are open-circuited. Numerical computations based on analytical formulations are applied to obtain torque-speed characteristics, including the flux-weakening operation. The methods determine current references to ensure the torque optimisations while currents and voltages are within their limits. The usefulness of the methods is verified by numerical results.

Inspec keywords: torque; electric potential; DC motor drives; machine control; brushless DC motors

Other keywords: current voltage; current references; normal faulty modes; control strategies; flux-weakening operation; torque-speed characteristics; torque optimisation; seven-phase BLDC machines; currents; voltages; account constraints; trapezoidal back electromotive forces; seven-phase axial flux brushless DC machines

Subjects: d.c. machines; Control of electric power systems; Drives

References

    1. 1)
      • 9. Jen-Ren, F., Lipo, T.A.: ‘Disturbance-free operation of a multiphase current-regulated motor drive with an opened phase’, IEEE Trans. Ind. Appl., 1994, 30, pp. 1267–1274.
    2. 2)
      • 15. Semail, E., Bouscayrol, A., Hautier, J.P.: ‘Vectorial formalism for analysis and design of polyphase synchronous machines’, Eur. Phys. J. AP, 2003, 22, pp. 207–220.
    3. 3)
      • 14. Locment, F., Semail, E., Piriou, F.: ‘Design and study of a multiphase axial-flux machine’, IEEE Trans. Magn., 2006, 42, pp. 1427–1430.
    4. 4)
      • 6. Dwari, S., Parsa, L.: ‘Open-circuit fault tolerant control of five-phase permanent magnet motors with third-harmonic back-EMF’. 2008 34th Annual Conf. of IEEE Industrial Electronics, Orlando, Fl, USA, 2008, pp. 3114–3119.
    5. 5)
      • 3. Locment, F., Semail, E., Kestelyn, X.: ‘Vectorial approach-based control of a seven-phase axial flux machine designed for fault operation’, IEEE Trans. Ind. Electron., 2008, 55, pp. 3682–3691.
    6. 6)
      • 16. Semail, E., Kestelyn, X., Bouscayrol, A.: ‘Right harmonic spectrum for the back-electromotive force of an n-phase synchronous motor’. 2004. 39th IAS Annual Meeting Conf. Record of the 2004 IEEE Industry Applications Conf., Seattle, WA, USA, 2004, pp. 71–78.
    7. 7)
      • 13. Locment, F., Semail, E., Kestelyn, X.: ‘Optimum use of DC bus by fitting the back-electromotive force of a 7-phase permanent magnet synchronous machine’. 2005 European Conf. on Power Electronics and Applications, Dresden, Germany, 2005, pp. 1–9.
    8. 8)
      • 8. Fall, O., Nguyen, N.K., Charpentier, J.F., et al: ‘Variable speed control of a 5-phase permanent magnet synchronous generator including voltage and current limits in healthy and open-circuited modes’, Electr. Power Syst. Res., 2016, 140, pp. 507–516.
    9. 9)
      • 7. Sun, Z., Wang, J., Jewell, G.W., et al: ‘Enhanced optimal torque control of fault-tolerant PM machine under flux-weakening operation’, IEEE Trans. Ind. Electron., 2010, 57, pp. 344–353.
    10. 10)
      • 11. Tian, B., An, Q.T., Duan, J.D., et al: ‘Decoupled modeling and nonlinear speed control for five-phase PM motor under single-phase open fault’, IEEE Trans. Power Electron., 2017, 32, pp. 5473–5486.
    11. 11)
      • 2. Duran, M.J., Barrero, F.: ‘Recent advances in the design, modeling, and control of multiphase machines part II’, IEEE Trans. Ind. Electron., 2016, 63, pp. 459–468.
    12. 12)
      • 1. Barrero, F., Duran, M.J.: ‘Recent advances in the design, modeling, and control of multiphase machines part I’, IEEE Trans. Ind. Electron., 2016, 63, pp. 449–458.
    13. 13)
      • 12. Liu, G., Lin, Z., Zhao, W., et al: ‘Third harmonic current injection in fault-tolerant five-phase permanent-magnet motor drive’, IEEE Trans. Power Electron., 2017, PP, pp. 1–10.
    14. 14)
      • 10. Zhou, H., Zhao, W., Liu, G., et al: ‘Remedial field- oriented control of five-phase fault-tolerant permanent-magnet motor by using reduced-order transformation matrices’, IEEE Trans. Ind. Electron., 2017, 64, pp. 169–178.
    15. 15)
      • 4. Dwari, S., Parsa, L.: ‘Fault-Tolerant control of five-phase permanent-magnet motors with trapezoidal back EMF’, IEEE Trans. Ind. Electron., 2011, 58, pp. 476–485.
    16. 16)
      • 5. Mohammadpour, A., Parsa, L.: ‘A unified fault-tolerant current control approach for five-phase PM motors with trapezoidal back EMF under different stator winding connections’, IEEE Trans. Power Electron., 2013, 28, pp. 3517–3527.
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