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Electromagnetic Analysis of a Synchronous Reluctance Motor with Single-Tooth Windings

Lookup NU author(s): Chris Donaghy-Spargo, Professor Barrie Mecrow, Dr James Widmer

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by Institute of Electrical and Electronics Engineers Inc., 2017.

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Abstract

© 2017 IEEE. This paper explores some of the key electromagnetic design aspects of a synchronous reluctance motor that is equipped with single-tooth windings (i.e., fractional slot concentrated windings). The analyzed machine, a 6-slot 4-pole motor, utilizes a segmented stator core structure for ease of coil winding, pre-assembly, and facilitation of high slot fill factors (60%). The impact on the motors torque producing capability and its power factor of these inter-segment air gaps between the stator segments is investigated through 2-D finite element analysis (FEA) studies where it is shown that they have a low impact. From previous studies, torque ripple is a known issue with this particular slot-pole combination of synchronous reluctance motor, and the use of two different commercially available semi-magnetic slot wedges is investigated as a method to improve torque quality. An analytical analysis of continuous rotor skewing is also investigated as an attempt to reduce the torque ripple. Finally, it is shown that through a combination of 2-D and 3-D FEA studies in conjunction with experimentally derived results on a prototype machine that axial fringing effects cannot be ignored when predicting the q-axis reactance in such machines. A comparison of measured orthogonal axis flux linkages/reactances with 3-D FEA studies is presented for the first time.


Publication metadata

Author(s): Donaghy-Spargo CM, Mecrow BC, Widmer JD

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Magnetics

Year: 2017

Volume: 53

Issue: 11

Print publication date: 01/11/2017

Online publication date: 05/05/2017

Acceptance date: 02/04/2016

Date deposited: 01/02/2018

ISSN (print): 0018-9464

ISSN (electronic): 1941-0069

Publisher: Institute of Electrical and Electronics Engineers Inc.

URL: https://doi.org/10.1109/TMAG.2017.2700896

DOI: 10.1109/TMAG.2017.2700896


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