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A simple method of AC Copper Loss Reduction in high speed axial flux permanent magnet machines using lamination steel sheet

Lookup NU author(s): Dr Nabeel Ahmed, Nasiru Aliyu, Gary Atkinson



This is the authors' accepted manuscript of a conference proceedings (inc. abstract) published in its final definitive form in 2019. For re-use rights please refer to the publishers terms and conditions.


This paper examines a method of AC copper loss reduction in a single-sided open slotted Axial Flux Machine (AFM) using Soft Magnetic Composite (SMC) core and steel lamination to shield the coils from stray fields. This approach is easy to implement for this topology and does not require the use of more complex twisted and Litz type conductors. To improve performance, the machine has a steel lamination sheet placed between the coils and airgap which has been optimized using 3D finite element analysis (FEA) to minimize both coil AC loss and lamination eddy current losses. Concentrated windings are used. These are pre-wound and slide onto the open, parallel sided stator tooth. This method of construction ensures a very high slot fill factor. The 3DFE simulations are validated with experimental tests and this paper shows the method has reduced AC copper loss by harnessing the shielding effect of the lamination sheet. It is found that the higher the conductivity of lamination, the lower the AC copper loss and better efficiency

Publication metadata

Author(s): Ahmed N, Aliyu N, Stannard N, Atkinson G

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: IEEE International Electric Machines and Drives Conference (IEMDC)

Year of Conference: 2019

Online publication date: 15/05/2019

Acceptance date: 28/03/2019

Date deposited: 17/06/2019