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Refurbishing three‑phase synchronous reluctance machines to multiphase machines

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Abstract
Refurbishing electrical machines to have a higher performance and/or reliability is a clear trend in the circular economy. This paper investigates the gain in efficiency, torque density and reliability with replacing the windings and the iron of the stator of existing three-phase synchronous reluctance machines (SynRMs), resulting in a multiphase machine. The stator housing, shaft, bearings and the rotor are not changed, to keep the cost of refurbishing low. As the housing and rotor are kept, logical constraints are to have the same inner and/or outer stator diameters, air gap length and axial length. In the new windings, an identical copper volume is considered as a constraint. An optimization technique is coupled to 2D finite element method to select the optimal slot dimensions. Case studies showed that it is possible to replace the stator of existing three-phase SynRMs with a better performance multiphase one. It is found that the average torque, efficiency and power factor of the five-phase SynRM are increased by 11.78%, 0.72% and 5.54%, respectively, compared to a three-phase SynRM at rated conditions. At higher speeds (three times rated value), the efficiency and average torque are greatly improved by about 3.64% and 33.67%, respectively, compared to the three-phase SynRM. Moreover, a faulty case of one phase opened is also investigated. The five-phase SynRM works at 75.45% of the healthy rated torque of the three-phase SynRM, whereas the three-phase SynRM works at only 43%. Measurements on an existing 5.5-kW, three-phase SynRM confirm the observed results.
Keywords
FEM, Machine design, Multiphase machines, Optimization, Synchronous reluctance motor, Winding factor, DESIGN OPTIMIZATION, MOTOR

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MLA
Basem Tawfiq Albassioni, Kotb, et al. “Refurbishing Three‑phase Synchronous Reluctance Machines to Multiphase Machines.” ELECTRICAL ENGINEERING, 2020, doi:10.1007/s00202-020-01064-w.
APA
Basem Tawfiq Albassioni, K., Ibrahim, M. N. F., El-Kholy, E., & Sergeant, P. (2020). Refurbishing three‑phase synchronous reluctance machines to multiphase machines. ELECTRICAL ENGINEERING. https://doi.org/10.1007/s00202-020-01064-w
Chicago author-date
Basem Tawfiq Albassioni, Kotb, Mohamed Nabil Fathy Ibrahim, Elwy El-Kholy, and Peter Sergeant. 2020. “Refurbishing Three‑phase Synchronous Reluctance Machines to Multiphase Machines.” ELECTRICAL ENGINEERING. https://doi.org/10.1007/s00202-020-01064-w.
Chicago author-date (all authors)
Basem Tawfiq Albassioni, Kotb, Mohamed Nabil Fathy Ibrahim, Elwy El-Kholy, and Peter Sergeant. 2020. “Refurbishing Three‑phase Synchronous Reluctance Machines to Multiphase Machines.” ELECTRICAL ENGINEERING. doi:10.1007/s00202-020-01064-w.
Vancouver
1.
Basem Tawfiq Albassioni K, Ibrahim MNF, El-Kholy E, Sergeant P. Refurbishing three‑phase synchronous reluctance machines to multiphase machines. ELECTRICAL ENGINEERING. 2020;
IEEE
[1]
K. Basem Tawfiq Albassioni, M. N. F. Ibrahim, E. El-Kholy, and P. Sergeant, “Refurbishing three‑phase synchronous reluctance machines to multiphase machines,” ELECTRICAL ENGINEERING, 2020.
@article{8670713,
  abstract     = {Refurbishing electrical machines to have a higher performance and/or reliability is a clear trend in the circular economy. This paper investigates the gain in efficiency, torque density and reliability with replacing the windings and the iron of the stator of existing three-phase synchronous reluctance machines (SynRMs), resulting in a multiphase machine. The stator housing, shaft, bearings and the rotor are not changed, to keep the cost of refurbishing low. As the housing and rotor are kept, logical constraints are to have the same inner and/or outer stator diameters, air gap length and axial length. In the new windings, an identical copper volume is considered as a constraint. An optimization technique is coupled to 2D finite element method to select the optimal slot dimensions. Case studies showed that it is possible to replace the stator of existing three-phase SynRMs with a better performance multiphase one. It is found that the average torque, efficiency and power factor of the five-phase SynRM are increased by 11.78%, 0.72% and 5.54%, respectively, compared to a three-phase SynRM at rated conditions. At higher speeds (three times rated value), the efficiency and average torque are greatly improved by about 3.64% and 33.67%, respectively, compared to the three-phase SynRM. Moreover, a faulty case of one phase opened is also investigated. The five-phase SynRM works at 75.45% of the healthy rated torque of the three-phase SynRM, whereas the three-phase SynRM works at only 43%. Measurements on an existing 5.5-kW, three-phase SynRM confirm the observed results.},
  author       = {Basem Tawfiq Albassioni, Kotb and Ibrahim, Mohamed Nabil Fathy and El-Kholy, Elwy and Sergeant, Peter},
  issn         = {0948-7921},
  journal      = {ELECTRICAL ENGINEERING},
  keywords     = {FEM,Machine design,Multiphase machines,Optimization,Synchronous reluctance motor,Winding factor,DESIGN OPTIMIZATION,MOTOR},
  language     = {eng},
  pages        = {14},
  title        = {Refurbishing three‑phase synchronous reluctance machines to multiphase machines},
  url          = {http://dx.doi.org/10.1007/s00202-020-01064-w},
  year         = {2020},
}

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