A Novel Concept of Ribless Synchronous Reluctance Motor for Enhanced Torque Capability

Yuli Bao, Michele Degano, Shuo Wang, Liu Chuan, He Zhang, Zhuang Xu, Chris Gerada

Research output: Journal PublicationArticlepeer-review

43 Citations (Scopus)


The rotor structure of synchronous reluctance machines (SynRel) is conventionally retained mechanically by iron ribs. In this paper, a novel structure for high-speed synchronous reluctance rotor is presented. The novelty of this paper is the proof of a concept of SynRel machine without iron ribs. Structurally, the rotor iron lamination segments are embedded in an adhesive resin material with high temperature resistance and mechanical strength. Three four-pole SynRel machines have been designed with the target of improving motor torque, and compared for different ribs configuration. It has been shown that the proposed motor performs enhanced torque, power factor, and efficiency with respect to conventional SynRel with iron ribs. An extensive sensitivity analysis of the ribless rotor geometry is carried out, followed by both mechanical analysis and experimental over speed test to guarantee its robustness above the operating speed range. The manufacturing procedure of this novel rotor is introduced. Finally, the experimental results on both SynRel prototypes are presented, showing the increase in torque, power factor, and efficiency of the proposed solution. This paper is a first step toward the definition of a viable and novel solution of SynRel machines with improved performance.

Original languageEnglish
Article number8710000
Pages (from-to)2553-2563
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Issue number4
Publication statusPublished - Apr 2020


  • Ribless rotor design
  • sensitivity analysis
  • synchronous reluctance machines (SynRel)
  • torque enhancement

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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