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All Journal International Journal of Electrical and Computer Engineering Bulletin of Electrical Engineering and Informatics
Syed Muhammad Naufal Syed Othman
Universiti Tun Hussein Onn Malaysia
Computer Science & IT Electrical & Electronics Engineering

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Preliminary analysis of eddy current and iron loss in magnetic gear in electric vehicle Mohd Firdaus Mohd Ab Halim; Erwan Sulaiman; Mahyuzie Jenal; Raja Nor Firdaus Kashfi Raja Othman; Syed Muhammad Naufal Syed Othman
International Journal of Electrical and Computer Engineering (IJECE) Vol 12, No 2: April 2022
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijece.v12i2.pp1161-1167

Abstract

The inclusion of a high energy density permanent magnet into magnetic gear improves the machine's torque density. However, it also contributes to eddy current loss, especially in a high-speed application such in electric vehicle. In this paper, the losses from eddy current and iron loss are investigated on concentric magnetic gear (CMG). Torque multiplier CMG is designed with 8/3 gear ratio for this study. Iron loss and eddy current loss are compared and discussed. Based on this study, eddy current loss contributes to almost 96% of the total loss. This finding is hoped to direct the researcher to focus more on reducing loss associated with eddy current loss.
Comparative analysis of modular outer rotor and modular inner rotor permanent magnet flux switching machine Roshada Ismail; Erwan Sulaiman; Syed Muhammad Naufal Syed Othman; Nur Afiqah Mostaman; Irfan Ali Soomro
Bulletin of Electrical Engineering and Informatics Vol 15, No 1: February 2026
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v15i1.8456

Abstract

A modular rotor is an advanced design in electric motor (EM) technology, offering enhanced performance and efficiency for various applications. Its segmented structure allows for optimized magnetic flux paths, reducing iron losses and improving energy efficiency. The modular rotors can be classified into modular inner rotors and modular outer rotors (ORs). While both have their applications, modular inner rotor permanent magnet flux switching machines (PMFSMs) face limitations, including lower torque density, inefficient magnetic flux operation, and reduced cooling capability, making them less suitable for high-torque applications. This paper presents an analysis of the comparison between a new modular OR and a modular inner rotor PMFSM. The outer OR-PMFSM offers higher torque density due to more efficient magnetic flux positioning, resulting in a better torque-to weight ratio. The design and analysis are conducted using JMAG designer version 18 under no-load and load conditions to test the proposed design's effectiveness. Hence, the suggested design obtained an increment of torque and power of 6.06% and 5.4%, respectively. In conclusion, the modular OR produces higher torque and power than the modular OR. The proposed motor can be very useful in electric bike applications for practical high performance and low cost.
Co-Authors Erwan Sulaiman Irfan Ali Soomro Mahyuzie Jenal Mohd Firdaus Mohd Ab Halim Nur Afiqah Mostaman Raja Nor Firdaus Kashfi Raja Othman Roshada Ismail