Influence of Gear Ratio on the Performance of Fractional Slot Concentrated Winding Permanent Magnet Machines

Abstract

Fractional slot concentrated winding (FSCW) permanent magnet synchronous machines (PMSMs) have been a research hotspot over the past few decades. Recently, the magnetic gearing effect in FSCW PMSMs is revealed along with its gear ratio which is a function of slot/pole number combination. At the design stage of FSCW PMSMs, one of the key issues is the selection of the slot/pole number combination. This paper shows that the gear ratio can contribute to a proper slot/pole number selection in any multi-phase FSCW PMSMs by acting as a unified index for a quick overall performance comparison. In the paper, firstly, the magnetic gearing effect in FSCW PMSMs is explained and the gear ratio is further discussed. The advantages of adopting gear ratio as the overall performance index over other indices are revealed. The influence of the gear ratio on the winding factor, torque output, cogging torque, inductance and rotor losses of 3- and 6-phase FSCW PMSMs are analyzed and validated by experiments, thus proving the analyses.

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Item Type:	Article
Authors/Creators:	Liu, Y. Zhu, Z.Q. https://orcid.org/0000-0001-7175-3307
Copyright, Publisher and Additional Information:	© 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works. Reproduced in accordance with the publisher's self-archiving policy.
Keywords:	Power capacitors; Gears; Torque; Harmonic analysis; Windings; Indexes; Measurement; concentrated winding; fractional slot; gear ratio; inductance; losses; magnetic gearing effect; permanent magnet machines; winding factor
Dates:	Published: October 2019 Published (online): 13 December 2018 Accepted: 20 November 2018
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Electronic and Electrical Engineering (Sheffield)
Depositing User:	Symplectic Sheffield
Date Deposited:	16 May 2019 13:36
Last Modified:	03 Dec 2021 09:50
Status:	Published
Publisher:	Institute of Electrical and Electronics Engineers (IEEE)
Refereed:	Yes
Identification Number:	10.1109/TIE.2018.2885728
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:146204

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Influence of Gear Ratio on the Performance of Fractional Slot Concentrated Winding Permanent Magnet Machines

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