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

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

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


Yuli Bao

Professor of Advanced Electrical Machines

Shuo Wang

Liu Chuan

Zhuang Xu

He Zhang


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 work 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 work is a first step towards the definition of a viable and novel solution of SynRel machines with improved performance.


Bao, Y., Degano, M., Wang, S., Chuan, L., Xu, Z., Zhang, H., & Gerada, C. (2020). A Novel Concept of Ribless Synchronous Reluctance Motor for Enhanced Torque Capability. IEEE Transactions on Industrial Electronics, 67(4), 2553-2563.

Journal Article Type Article
Acceptance Date Apr 12, 2019
Online Publication Date May 8, 2019
Publication Date 2020-04
Deposit Date Apr 17, 2019
Publicly Available Date Apr 18, 2019
Journal IEEE Transactions on Industrial Electronics
Electronic ISSN 1557-9948
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 67
Issue 4
Pages 2553-2563
Keywords Torque enhancement, Sensitivity analysis, Ribless rotor design, Synchronous reluctance machines
Public URL
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Additional Information © 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.


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