Minimization of Torque Ripples in Multi-Stack Slotted Stator Axial-Flux Synchronous Machine by Modifying Magnet Shape

Zia Mahmood, Junaid Ikram, Rabiah Badar, Syed Sabir Hussain Bukhari, Madad Ali Shah, Ali Asghar Memon and Mikulas Huba
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Zia Mahmood: Department of Electrical and Computer Engineering, COMSATS University Islamabad, Islamabad 45550, Pakistan
Junaid Ikram: Department of Electrical and Computer Engineering, COMSATS University Islamabad, Islamabad 45550, Pakistan
Rabiah Badar: Department of Electrical and Computer Engineering, COMSATS University Islamabad, Islamabad 45550, Pakistan
Syed Sabir Hussain Bukhari: Department of Electrical Engineering, Sukkur IBA University, Sukkur 65200, Pakistan
Madad Ali Shah: Department of Electrical Engineering, Sukkur IBA University, Sukkur 65200, Pakistan
Ali Asghar Memon: Department of Electrical Engineering, Mehran University of Engineering and Technology, Jamshoro 76062, Pakistan
Mikulas Huba: Institute of Automotive Mechatronics, Faculty of Electrical Engineering and Information Technology, Slovak University of Technology in Bratislava, 81219 Bratislava, Slovakia

Mathematics, 2022, vol. 10, issue 10, 1-16

Abstract: This paper presents a proposed model of a multi-stack slotted stator axial-flux type permanent magnet synchronous machine (AFPMSM) specifically for reducing torque ripple. The proposed AFPMSM model uses pentagon-shaped permanent magnets (PMs). It has a low value of cogging torque and torque ripples compared to the conventional model with a trapezoidal magnet shape. Additionally, it has increased internal generated voltage (Ef) as compared to the conventional model. To further enhance Ef phases and minimize cogging torque of the proposed model, the proposed AFPMSM model was optimized by varying different sides of PMs using a genetic algorithm (GA). A time-stepped three-dimensional (3D) finite element analysis (FEA) was performed for the comparative analysis of conventional, proposed, and optimized AFPMSM models. From this comparative performance analysis, it is observed that torque ripples and cogging torque of the optimized AFPMSM are significantly decreased, while output average torque is appreciably increased. Ef and output power are also enhanced.

Keywords: axial-flux machine; pentagon magnet shape; torque ripple; internal generated voltage (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2022
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