Mohammadi, Esmaeil;
Mohammadi, Ali;
Jalali Kondelaji, Mohammad Amin;
Asef, Pedram;
Boldea, Ion G;
Ionel, Dan;
(2025)
High Torque Density Dual-stator Vernier Motors with Flux Concentrating Rotors.
In:
Proceedings of the IEEE Energy Conversion Congress and Exposition, ECCE.
(pp. pp. 1-7).
IEEE
(In press).
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Abstract
Axial Flux Permanent Magnet (AFPM) machines are increasingly being studied for low-speed, direct-drive applications due to their compact structure and high torque output. This study proposes two novel dual-stator AFPM vernier machine topologies: a spoke-type rotor configuration and a back-to-back Halbach array rotor. Both designs employ dual outer stators with 12 double-layer concentrated windings, and high-polarity rotor configurations to enhance flux concentration. A threedimensional finite element model, which was previously validated by a laboratory prototype motor was utilized to evaluate the electromagnetic characteristics of the proposed topologies. These characteristics include torque density, airgap flux distribution, and harmonic content. Comparative results show that under a current density of 35 A/mm2 , the spoke-type topology achieves an efficiency of 85.2% and an average torque that is 13.5% higher than the double-stator single-rotor (DSSR) Halbach topology, which records 83.5% efficiency. Both topologies exhibit a torque ripple of 2%, highlighting consistent electromagnetic performance and smooth operation. Additionally, the spoke-type DSSR features an extended constant power operating range due to enhanced flux concentration. These findings confirm the spoke-type AFPM machine as a promising candidate for high-performance direct-drive systems, delivering improved electromagnetic torque, efficiency, and operational smoothness through strategic magnetic topology and flux profiling.
| Type: | Proceedings paper |
|---|---|
| Title: | High Torque Density Dual-stator Vernier Motors with Flux Concentrating Rotors |
| Event: | IEEE Energy Conversion Congress and Exposition, ECCE |
| Location: | Philadelphia, PA, USA |
| Dates: | 19th-23rd October 2025 |
| Open access status: | An open access version is available from UCL Discovery |
| Publisher version: | https://ieeexplore.ieee.org/xpl/conhome/1002943/al... |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. |
| Keywords: | AC machines, Axial flux motors, dual stator, finite element analysis, Halbach array, spoke rotor |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10216192 |
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