Considerations on the Effects That Core Material Machining Has on an Electrical Machine's Performance

Ahmed Al-Timimy, Gaurang Vakil, Michele Degano, Paolo Giangrande, Chris Gerada, Michael Galea

Research output: Journal PublicationArticlepeer-review

47 Citations (Scopus)
131 Downloads (Pure)


An often-overlooked aspect during the development process of electrical machines is the validity and accuracy of the machine material properties being used at the design stage. Designers usually consider the data provided by the material supplier, which are measured on material in an unprocessed state. However, the fact that the machining processes required to produce the finished product (e.g., the stator core) can permanently vary the material properties is very often neglected. This paper, therefore, deals with and investigates the effects that such processes can have on the overall machine performance. To do this, three sets of material data, the material suppliers' data, material data based on conventional characterization methods, and material data based on test samples that include the manufacturing processes, are used to develop three versions of the same baseline machine. The results of these three machines are then compared, and the resulting variations of the machine's performance are presented and described. The chosen baseline machine is a high-performance and relatively high speed, aerospace, electrical machine. Special attention is focused on the efficiency maps of the machine, as this aspect is highly dependent on the material properties that are the most sensitive to manufacturing processes such as the material's anhysteretic B-H curve and its specific core loss.

Original languageEnglish
Article number8295137
Pages (from-to)1154-1163
Number of pages10
JournalIEEE Transactions on Energy Conversion
Issue number3
Publication statusPublished - Sept 2018


  • Magnetic materials
  • manufacturing processes
  • performance analysis
  • permanent magnet motors

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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