Journal of Applied Science and Engineering

Published by Tamkang University Press

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Torque Ripple Minimization Techniques in Three Phase Synchronous Reluctance Motor and Permanent Magnet Assisted Synchronous Reluctance Motor: A Review

 2027

 Volume 36

V Rajini1, V. S. Nagarajan2, Bharatiraja .C3, Krtin Narayanan1, and N Christina Lydia Grace1

1Department of Electrical and Electronics Engineering, Sri Sivasubramaniya Nadar College of Engineering, Chennai, Kalavakkam, Tamil Nadu, 603110, India

2Department of Electrical and Electronics Engineering, SSN School of Engineering, Shiv Nadar University Chennai, Kalavakkam, Tamil Nadu, 603110, India

3Centre for Electric Mobility, SRM Institute of Science and Technology, SRM Nagar, Kattankulathur, 603203, Chengalpattu, Chennai, TN, India

Received: May 30, 2026
Accepted: August 24, 2026
Publication Date: October 09, 2026

上傳圖片

Schematic of Syn RM and PmaSynRM

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: BibTeX | http://dx.doi.org/10.6180/jase.202701_36.008

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Synchronous Reluctance Motor (SynRM), Permanent-Magnet-assisted Synchronous Reluctance Motor (PMa-SynRM), and Ferrite-Assisted Synchronous Reluctance (FASR) motor topologies have emerged as promising alternatives for high efficiency electric drive applications due to their reduced rotor losses, robust construction, and potential for reduced dependence on rare earth materials. However, torque ripple remains a major performance limitation in these machines, leading to vibration, acoustic noise, speed pulsation and reduced drive quality. This paper presents a comprehensive review of torque ripple mitigation techniques reported in the literature for three major reluctance based synchronous machine variants: pure SynRM, PMa-SynRM, and FASR machines. The reviewed techniques include rotor flux barrier number and geometry optimization, barrier shape refinement, rib and bridge design, permanent magnet placement and shaping, ferrite magnet arrangement, rotor skewing and step skewing, stator slot/pole and winding configuration optimization and control based harmonic current injection. The review highlights the relative effectiveness, practical constraints and performance trade offs of these methods with respect to average torque, efficiency, power factor, demagnetization risk, manufacturability and mechanical integrity. By consolidating the available literature, this paper aims to provide a structured understanding of torque ripple reduction strategies and to identify suitable design and control approaches for achieving smoother torque production in SynRM, PMa-SynRM, and FASR motor drives.

Keywords: Ferrite Assisted Synchronous Reluctance (FASR), Finite Element Analysis (FEA), Permanent Magnet assisted Synchronous Reluctance (PMa-SynRM), Rotor step skew, Slot/pole selection, Synchronous Reluctance Motor (SynRM), Torque ripple

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