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Energies 2017, 10(10), 1492; https://doi.org/10.3390/en10101492

Field-Weakening Performance Improvement of the Yokeless and Segmented Armature Axial Flux Motor for Electric Vehicles

School of Electrical and Information Engineering, Tianjin University, No. 92 Weijin Road, Tianjin 300072, China
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Received: 10 September 2017 / Revised: 23 September 2017 / Accepted: 25 September 2017 / Published: 26 September 2017
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Abstract

In order to avoid the unsafe operation and raise efficiency of yokeless and segmented armature axial flux motors at high speed, the control current of air gap flux is expected to be as small as possible with the same field-weakening effect. To reduce the control complexity, a new structure of module poles with a combination of permanent magnet and soft magnetic material is proposed, which has the characteristics of lower d-axis reluctance and a higher performance of yokeless and segmented armature axial flux motor with surface mounted permanent magnet. According to finite element analysis (FEA), the flux distributions of a rotor pole in no-load and demagnetization condition are contrasted, and under this new configuration, the derivative analytical models of back electromotive-force (EMF), electromagnetic torque, and air gap flux are validated, moreover, the influence of soft magnetic material of rotor poles on controlling the air gap flux is investigated in different load. Based on a particular objective function, the combination of permanent magnet and soft magnetic material is optimized. The results show that optimal solution of field-weakening performance of yokeless and segmented armature axial flux motors can be improved effectively and legitimately. View Full-Text
Keywords: axial flux permanent magnet motor; yokeless and segmented armature; field-weakening; soft magnetic composites; module poles axial flux permanent magnet motor; yokeless and segmented armature; field-weakening; soft magnetic composites; module poles
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Wang, X.; Xu, S.; Li, C.; Li, X. Field-Weakening Performance Improvement of the Yokeless and Segmented Armature Axial Flux Motor for Electric Vehicles. Energies 2017, 10, 1492.

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