High-speed solid rotor permanent magnet machines: Concept and design

Puvan Arumugam, Zeyuan Xu, Antonino La Rocca, Gaurang Vakil, Matthew Dickinson, Emmanuel Amankwah, Tahar Hamiti, Serhiy Bozhko, Chris Gerada, Stephen J. Pickering

Research output: Journal PublicationArticlepeer-review

58 Citations (Scopus)


This paper proposes a novel solid rotor topology for an interior permanent magnet (IPM) machine, adopted in this case for an aircraft starter-generator design. The key challenge in the design is to satisfy two operating conditions that are a high torque at start and a high speed at cruise. Conventional IPM topologies that are highly capable of extended field weakening are found to be limited at high speed due to structural constraints associated with the rotor material. To adopt the IPM concept for high-speed operation, it is proposed to adopt a rotor constructed from semimagnetic stainless steel, which has a higher yield strength than laminated silicon steel. To maintain minimal stress levels and also minimize the resultant eddy current losses due to the lack of laminations, different approaches are considered and studied. Finally, to achieve a better tradeoff between the structural and electromagnetic constraints, a novel slitted approach is implemented on the rotor. The proposed rotor topology is verified using electromagnetic, static structural, and dynamic structural finite-element analyses. An experiment is performed to confirm the feasibility of the proposed rotor. It is shown that the proposed solid rotor concept for an IPM fulfils the design requirements while satisfying the structural, thermal, and magnetic limitations.

Original languageEnglish
Article number7515169
Pages (from-to)391-400
Number of pages10
JournalIEEE Transactions on Transportation Electrification
Issue number3
Publication statusPublished - Sept 2016


  • Aircraft
  • High-speed machines
  • Interior
  • More electric
  • Permanent magnet (PM)
  • Solid rotor
  • Starter-generator
  • Structural

ASJC Scopus subject areas

  • Automotive Engineering
  • Transportation
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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