Manuscript DOI: 10.1109/TMAG.2024.3521042
Manuscript ID: MAGCON-24-06-0398
Manuscript Title: 3D FE Analysis of Magnet Segmentation for Optimizing Thrust Force and Eddy Current Loss of Arc Linear Servo Motor.

Authors:  Zuhair Abbas , Jun-Hyeok Heo , Ikhlaq Ahmad , Jun-Kyu Kang , and Jin Hur , Fellow, IEEE

Abstract: When employing high-magnetic co-energy sintered NdFeB magnets, permanent magnet linear synchronous machines (PMLSMs)

exhibit several advantages over traditional induction and direct current machines, including greater thrust capability and efficiency.

However, during operation at high frequencies, significant eddy current losses in the permanent magnet (PM) can result in elevated

temperatures, increasing the risk of irreversible demagnetization. This issue is further compounded by the large air gap in such

machines, making the thrust force a critical factor for ensuring efficient performance. A complete magnet segmentation (CMS)

can be an effective method for reducing the PM eddy current losses, but it reduces the thrust characteristics and mechanical

robustness of the PMLSM. Therefore, a partial magnet segmentation (PMS), namely, single-side PMS (SSPMS), is studied for the

new arc-structured PMLSM to optimize the eddy current loss and thrust force. A comparison between the initial PM, CMS, and

SSPMS is performed using the Ansys Maxwell 3-D finite element analysis (FEA) tool. The results demonstrate that the SSPMS

configuration significantly reduces PM eddy current loss while maintaining the same thrust force. Moreover, it offers superior

mechanical robustness and lower manufacturing costs compared to the conventional CMS.