Optimal Design of an Interior Permanent Magnet Synchronous Motor with Cobalt Iron Core

Pedro P. C. Bhagubai, Luís F. D. Bucho, João F. P. Fernandes and P. J. Costa Branco
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Pedro P. C. Bhagubai: IDMEC, Instituto Superior Técnico, University of Lisboa, 1049-001 Lisboa, Portugal
Luís F. D. Bucho: IDMEC, Instituto Superior Técnico, University of Lisboa, 1049-001 Lisboa, Portugal
João F. P. Fernandes: IDMEC, Instituto Superior Técnico, University of Lisboa, 1049-001 Lisboa, Portugal
P. J. Costa Branco: IDMEC, Instituto Superior Técnico, University of Lisboa, 1049-001 Lisboa, Portugal

Energies, 2022, vol. 15, issue 8, 1-21

Abstract: The use of a cobalt-iron (VaCoFe) core is investigated as an alternative to silicon-iron (FeSi) in the design of interior permanent magnet synchronous motors (IPMSM). Considering VaCoFe and FeSi cores, a spoke-type IPMSM geometry is optimized for a torque range up to 40 N·m, providing a general comparative analysis between materials. This is done considering the application of a four-motor competition vehicle’s powertrain. A genetic optimization algorithm is coupled to the motor’s electromagnetic and thermal hybrid analytical/finite-element model to provide sufficiently accurate results within a feasible time. VaCoFe allows an estimated increase of up to 64% in torque for the same efficiency level, or up to 5% in efficiency for the same torque. After optimization and using a detailed time-dependent model, a potential 3.2% increase in efficiency, a core weight reduction of 4.1%, and a decrease of 9.6% in the motor’s core volume were found for the VaCoFe at 20 N·m. In addition, for the same motor volume, the VaCoFe allows an increase of 51.9% in torque with an increase of 1.1% in efficiency when compared with FeSi.

Keywords: electric vehicle applications; electromagnetic model; optimization; thermal model; vanadium cobalt (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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