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High Speed Permanent Magnet Assisted Synchronous Reluctance Machine - Part II: Performance Boundaries

Di Nardo, Mauro; Gallicchio, Gianvito; Palmieri, Marco; Marfoli, Alessandro; Degano, Michele; Gerada, Chris; Cupertino, Francesco

High Speed Permanent Magnet Assisted Synchronous Reluctance Machine - Part II: Performance Boundaries Thumbnail


Mauro Di Nardo

Gianvito Gallicchio

Marco Palmieri

Alessandro Marfoli

Francesco Cupertino


The insertion of permanent magnets (PMs) within the rotor slots of Synchronous Reluctance Machines (SyRM) is the most common design strategy used to increase significantly their performance. In this paper it is shown how a permanent magnet assisted synchronous reluctance machine (PMaSyRM) can be optimized to satisfy all the electromagnetic and structural constraints arising as the maximum operating speed increases. This is done considering a variety PMs material. This work, the second of two companion papers, briefly recalls the novel systematic design approach proposed in Part I, and then describes the characteristics of the optimal machines achieved considering a maximum speed ranging from 1 to 140 krpm with and without the assistance of ferrite and neodymium based PMs. The reasons behind the performance deterioration as the speed increases are all investigated along with the geometrical variations of the optimal designs. The selection of the design solution to be manufactured is justified as well as the final structural and electromagnetic refinement stages leading to the final prototype. All the reported considerations are experimentally validated testing an 8.5kW at 80krpm PMaSyRM, comparing the measured and expected performance in terms of torque and internal power factor.

Journal Article Type Article
Acceptance Date May 14, 2022
Online Publication Date May 20, 2022
Publication Date 2022-12
Deposit Date Jul 7, 2022
Publicly Available Date May 21, 2024
Journal IEEE Transactions on Energy Conversion
Print ISSN 0885-8969
Electronic ISSN 1558-0059
Publisher Institute of Electrical and Electronics Engineers (IEEE)
Peer Reviewed Peer Reviewed
Volume 37
Issue 4
Pages 2567-2577
Keywords Electrical and Electronic Engineering; Energy Engineering and Power Technology
Public URL
Publisher URL


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