Design Optimization of a High-Speed Synchronous Reluctance Machine

Mauro Di Nardo, Giovanni Lo Calzo, Michael Galea, Chris Gerada

Research output: Journal PublicationArticlepeer-review

87 Citations (Scopus)


Synchronous reluctance machines, including the permanent-magnet-assisted variants, are competitive motor topologies if the application requires high efficiency and a cost-effective solution with a high flux-weakening capability. However, increasing operating speeds incur challenging design and development decisions, mainly in order to find design solutions that ensure the machine's structural integrity without compromising the overall performance. In this paper, a comprehensive design procedure for high-speed synchronous reluctance machines is presented. In order to validate the procedure, a 5-kW 80 000-r/min machine is considered. The proposed strategy consists of a two-step procedure in which the electromagnetic and structural designs have been properly decoupled, dividing the design space in two subsets. Each subset mainly affects the electromagnetic or the structural performances. Several structural design optimizations have been then performed with the aim of finding the optimal tradeoff between the rotor geometrical complexity (that defines the required computational resources) and the electromagnetic performance. The reported experimental tests of the prototyped machine validate the proposed design strategy, which can be used as general guidelines on the structural design of synchronous reluctance machines.

Original languageEnglish
Article number8055613
Pages (from-to)233-243
Number of pages11
JournalIEEE Transactions on Industry Applications
Issue number1
Publication statusPublished - 1 Jan 2018


  • Finite-element analysis (FEA)
  • high speed
  • multiobjective optimization
  • multiphysics design
  • rotor structural design
  • synchronous reluctance (SyR) machines

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering


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