Lookup NU author(s): Chris Donaghy-Spargo,
Professor Barrie Mecrow,
Dr James Widmer
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.
For re-use rights please refer to the publisher's terms and conditions.
© 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.
Author(s): Donaghy-Spargo CM, Mecrow BC, Widmer JD
Publication type: Article
Publication status: Published
Journal: IEEE Transactions on Magnetics
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.
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