Electromagnetic Analysis of a Synchronous Reluctance Motor with Single Tooth Windings

Donaghy-Spargo, C.M.; Mecrow, B.C.; Widmer, J.D.

Abstract

This paper explores some key electromagnetic design aspects of a synchronous reluctance motor which 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 2D 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 are 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 through a combination of 2D & 3D 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/reactance with 3D FEA studies is presented for the first time.

Citation

Donaghy-Spargo, C., Mecrow, B., & Widmer, J. (2017). Electromagnetic Analysis of a Synchronous Reluctance Motor with Single Tooth Windings. IEEE Transactions on Magnetics, 53(11), Article 8206207. https://doi.org/10.1109/tmag.2017.2700896

• Journal Article Type: Article
• Acceptance Date: May 2, 2017
• Online Publication Date: May 5, 2017
• Publication Date: Nov 1, 2017
• Deposit Date: May 2, 2017
• Publicly Available Date: May 4, 2017
• Journal: IEEE Transactions on Magnetics
• Print ISSN: 0018-9464
• Electronic ISSN: 1941-0069
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 53
• Issue: 11
• Article Number: 8206207
• DOI: https://doi.org/10.1109/tmag.2017.2700896
• Public URL: https://durham-repository.worktribe.com/output/1380410