Demagnetization and Thermal Analysis of Six-Phase Permanent Magnet Motor-based Integrated Onboard EV Charging

Zia Ullah, Mohamed Y. Metwly, Ahmed Hemeida, Ayman S. Abdel-Khalik, Jiang Biao He, Shehab Ahmed

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Integrated onboard battery charger (IOBC) is an emerging technology that charges electric car battery packs utilizing the same circuitry for electric propulsion, reducing the cost and weight of an EV. During charging, while ensuring zero-average torque to avoid rotation, permanent magnets (PMs) synchronous motors with fractional slot concentrated winding (FSCW) may be subjected to irreversible demagnetization due to sub and super space harmonics with relatively high magnitudes. This paper presents the design and optimization of six-phase surface-mounted permanent magnet (SPM) and interior permanent magnet (IPM) motors with FSCW considering the impact of PM demagnetization during IOBC. A detailed thermal and demagnetization analysis is conducted to identify the risk of PM demagnetization during propulsion and IOBC modes. The performance and demagnetization risk for SPM and IPM motors with different power ratings used in commercial EVs are compared at various operating conditions. In the integrated charging process, grid-to-vehicle and vehicle-to-grid power circulations are practically implemented. Simulations are conducted using a three-dimensional finite element analysis. Experimental results of a 15 kW IPM motor are provided for further verification.

Original languageEnglish
Pages (from-to)1
Number of pages1
JournalIEEE Transactions on Transportation Electrification
StateAccepted/In press - 2023

Bibliographical note

Publisher Copyright:


  • Demagnetization
  • Fractional slot concentrated winding
  • Induction motors
  • Integrated onboard charger
  • PM Demagnetization
  • Propulsion
  • Thermal analysis
  • Torque
  • Traction motors
  • Windings
  • six-phase PMSM
  • thermal analysis

ASJC Scopus subject areas

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


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