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The impact of the unbalance in both the voltage and the frequency on the performance of single and cascaded induction motors

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  • El-Kharashi, Eyhab
  • Massoud, Joseph Girgis
  • Al-Ahmar, M.A.

Abstract

This study focuses on the performance and energy conversion process of cascaded induction motors (CIMs) operated under balanced and unbalanced conditions. In this paper, two mechanically combined induction motors having a similar rating (25 Hp) are investigated for comparing with a large induction motor (50 Hp) — imbalances can occur in the applied voltage, operating frequency, or both. The impacts of both unbalanced voltage and unrated frequency on maximum and steady-state torque, power factor, input active and reactive powers, stator and rotor copper losses, and total harmonic distortion (THD) in voltage and current, have been investigated through a simulated model created using Matlab/Simulink software. This work demonstrates that machine performance and efficiency are improved by introducing more electrical and mechanical advantages of cascading the electrical machines. The results show that the maximum torque of the CIMs is higher than that of a single one at different operation cases; it is increased by 18.4% during balanced operation. The total copper losses are reduced by 36.5% in balanced operation when using CIMs instead of the large motor. Consequently, the energy conversion process and performance were significantly improved.

Suggested Citation

  • El-Kharashi, Eyhab & Massoud, Joseph Girgis & Al-Ahmar, M.A., 2019. "The impact of the unbalance in both the voltage and the frequency on the performance of single and cascaded induction motors," Energy, Elsevier, vol. 181(C), pages 561-575.
    • Handle: RePEc:eee:energy:v:181:y:2019:i:c:p:561-575
    DOI: 10.1016/j.energy.2019.05.169
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    References listed on IDEAS

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    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. Popa, Cezar & Pentiuc, Radu, 2012. "Analysis of a new induction thermal converter for heating," Energy, Elsevier, vol. 42(1), pages 81-93.
    3. Sakthivel, V.P. & Subramanian, S., 2011. "On-site efficiency evaluation of three-phase induction motor based on particle swarm optimization," Energy, Elsevier, vol. 36(3), pages 1713-1720.
    4. Paul Waide & Conrad U. Brunner, 2011. "Energy-Efficiency Policy Opportunities for Electric Motor-Driven Systems," IEA Energy Papers 2011/7, OECD Publishing.
    5. El-Kharashi, Eyhab & El-Dessouki, Maher, 2014. "Coupling induction motors to improve the energy conversion process during balanced and unbalanced operation," Energy, Elsevier, vol. 65(C), pages 511-516.
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    Cited by:

    1. Márcio Arvelos Moraes & Vinícius Henrique Farias Brito & José Carlos de Oliveira, 2022. "An Approach for Determining Voltage Imbalance Contributions Based on Complex Independent Component Analysis," Energies, MDPI, vol. 15(19), pages 1-17, September.

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