A Six-Phase 24-Slot/10-Pole Permanent-Magnet Machine with Low Space Harmonics for Electric Vehicle Applications

Ayman S. Abdel-Khalik, Shehab Ahmed, Ahmed M. Massoud

Research output: Contribution to journalArticlepeer-review

46 Scopus citations


This paper proposes a six-phase surface-mounted permanent-magnet machine with a 24-slot/10-pole fractional slot winding, which not only eliminates the air-gap flux subharmonics, but also minimizes the effect of slot harmonics, which highly affect both the core and magnet losses. The six-phase winding design also offers an improved drive train availability for electric vehicle applications due to its inherent high fault-tolerant capability. When compared with a three-phase design, the proposed winding offers approximately 3.5% improvement in torque density, a significant reduction in both the core and magnet losses, and an improved overall efficiency. The proposed winding is deduced based on the stator shifting concept of two 12-slot/10-pole stators with single tooth windings. The coil span of the resulting machine will be two slots, which stands as a compromise between single tooth and distributed windings. The concept of stator shifting is first presented, and then, a prototype machine is designed and simulated using the 2-D finite-element analysis to validate the proposed concept. A comparative study is also carried out to compare six-phase and three-phase designs with the same slot/pole combination and also with the 18-slot/10-pole combination, which was recently shown to be a competitive alternative.

Original languageEnglish (US)
Article number7420728
JournalIEEE Transactions on Magnetics
Issue number6
StatePublished - Jun 1 2016
Externally publishedYes


  • Eddy current losses
  • fractional slot-concentrated winding (FSCW)
  • six-phase
  • slot/pole combinations
  • stator shifting
  • surface-mounted permanent-magnet (PM) machine

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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