A Nine-phase Six-Terminal Fractional-Slot-Winding for Interior Permanent-Magnet Machines with Low Space Harmonics

Ayman S. Abdel-Khalik, Shady Gadoue, Shehab Ahmed

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

This paper introduces a nine-phase six-terminal fractional slot concentrated winding layout suitable for Interior Permanent-Magnet (IPM) machine with a number of stator slots equals a multiple of nine. The winding layout when compared with a three-phase machine having the same slot/pole combination can effectively eliminate all air-gap flux sub harmonics. This highly reduces rotor core and magnet losses. Moreover, it offers a torque gain of approximately 2.5% over conventional three-phase winding layout. The proposed layout is investigated based on some well-known slot-pole combinations, namely, 9-slot/8-pole and 9-slot/10-pole, and a comparison is carried out with the conventional three-phase case assuming same stator and rotor dimensions. Being a multiphase winding, the proposed layout also offers a higher reliability-oriented design over the three-phase based systems. During a fault in one of the three-phase converters, the machine can steadily run at approximately half load with the faulty converter disconnected. The proposed winding is also compared with the well-known six-phase 12-slot/10-pole combination in terms of torque production, torque ripple, and induced eddy current losses.
Original languageEnglish (US)
Title of host publication2018 XIII International Conference on Electrical Machines (ICEM)
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages499-505
Number of pages7
ISBN (Print)9781538624777
DOIs
StatePublished - Oct 25 2018

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