Work

Fault-Tolerant Redesign of a Quad-Winding PMSM to Prevent Irreversible Partial Demagnetization

Year: 2026

Type: article

Abstract: This paper proposes a fault-tolerant optimal design method for quad-winding permanent magnet synchronous motors (PMSMs) considering irreversible demagnetization under fault conditions. In quad-winding motors, when one or more winding sets become unavailable, the remaining windings must carry higher current to maintain the required torque. This increases the external magnetomotive force acting on the permanent magnets and may cause irreversible demagnetization, particularly in spoke-type magnet structures. To address this issue, the demagnetization characteristics of the quad-winding motor were analyzed under healthy and faulty operating conditions. Based on this analysis, an optimization process using a Radial Basis Function–Multi-Layer Perceptron (RBF–MLP) surrogate model and a combination of grid-based search and local optimization was applied to obtain an optimal motor design. The optimization results show that the irreversible demagnetization ratio was reduced from 5.9% to 0.5% while maintaining a similar magnet volume. The proposed design approach effectively suppresses irreversible demagnetization in quad-winding PMSMs.

Source: Actuators

DOI: 10.3390/act15050245

Authors: Min-Seong Jo, Young-Joon Song, Kyung-il Woo, Kyu-Yun Hwang

Institutions: Kumoh National Institute of Technology, Pukyong National University

Language: English

Topic: Electric Motor Design and Analysis

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: gold

Estimated APC paid: $2,896