Modifications from Squirrel-cage Rotor to Multi-layer Flux-Barrier Reluctance Rotor to Achieve Higher Machine Efficiency

This is the authors' abstract. We don't add key points for this paper.

This paper is mainly focused on the feasibility of replacing the squirrel-cage rotor with the flux-barrier reluctance rotor for refrigeration compressors to achieve higher efficiency. Initially, given a certain stator from an applied IM, the design and optimization of the flux-barrier reluctance rotor are carried out considering the influence of different pole-pair numbers and flux-barrier numbers on electromagnetic performance. Then, two methods, including adopting the unequal turn winding and employing the Ferrite-Assisted Synchronous Reluctance Machine (FA-SynRM), are proposed to reduce the voltage caused by the low power factor of the Synchronous Reluctance Machine (SynRM). Meanwhile, the mechanical stress optimization is performed for the high-speed operating condition. Finally, the electromagnetic performance of the SynRM and the FA-SynRM are analyzed and compared, whose outcomes demonstrating that adopting the SynRM rotor brings a much more significant efficiency increase.