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Energies 2017, 10(10), 1500; doi:10.3390/en10101500

Performance Comparison of Conventional Synchronous Reluctance Machines and PM-Assisted Types with Combined Star–Delta Winding

1
Department of Electrical Energy, Metals, Mechanical Constructions and Systems, Ghent University, 9000 Ghent, Belgium
2
Electrical Engineering Department, Kafrelshiekh University, Kafr El-Sheikh 33511, Egypt
3
Electrical Power and Machines Department, Tanta University, Tanta 31527, Egypt
4
Flanders Make, The Strategic Research Center for the Manufacturing Industry, B-8500 Kortrijk, Belgium
*
Author to whom correspondence should be addressed.
Received: 23 August 2017 / Revised: 18 September 2017 / Accepted: 20 September 2017 / Published: 27 September 2017
(This article belongs to the Special Issue Electric Machines and Drives for Renewable Energy Harvesting 2017)

Abstract

This paper compares four prototype Synchronous Reluctance Motors (SynRMs) having an identical geometry of iron lamination stacks in the stator and rotor. Two different stator winding layouts are employed: a conventional three-phase star connection and a combined star–delta winding. In addition, two rotors are considered: a conventional rotor without magnets and a rotor with ferrite magnets. The performance of the four SynRMs is evaluated using a two-dimensional (2D) Finite Element Model (FEM). For the same copper volume and current, the combined star–delta-connected stator with Permanent Magnets (PMs) in the rotor corresponds to an approximately 22% increase in the output torque at rated current and speed compared to the conventional machine. This improvement is mainly thanks to adding ferrite PMs in the rotor as well as to the improved winding factor of the combined star–delta winding. The torque gain increases up to 150% for low current. Moreover, the rated efficiency is 93.60% compared to 92.10% for the conventional machine. On the other hand, the impact on the power factor and losses of SynRM when using the star–delta windings instead of the star windings is merely negligible. The theoretical results are experimentally validated using four identical prototype machines with identical lamination stacks but different rotors and winding layouts. View Full-Text
Keywords: combined star–delta winding; design; FEM; PM-assisted; synchronous reluctance motor (SynRM) combined star–delta winding; design; FEM; PM-assisted; synchronous reluctance motor (SynRM)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Ibrahim, M.N.F.; Rashad, E.; Sergeant, P. Performance Comparison of Conventional Synchronous Reluctance Machines and PM-Assisted Types with Combined Star–Delta Winding. Energies 2017, 10, 1500.

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