Techniques for Reducing Eddy Current Losses in Permanent Magnet

This paper focuses on investigating the most effective methods for reducing magnet eddy current loss. These techniques were utilised on permanent magnets in a surface-mounted permanent magnet synchronous machine with a distributed winding. Magnet segmentation and optimization of the segmented magnet shape comprise the initial methodology. On the other hand, the second method involves placing a conductive cylinder, known as a shielding cylinder, around the magnets to provide protection. The electromagnetic field analysis and computation of eddy current losses in the studied machine were performed using a two-dimensional finite element method.

The objective of this paper is to examine various methods for reducing eddy current losses in a surface-mounted Permanent Magnet Synchronous Machine (PMSM). The initial phase focuses on reducing the loss of eddy currents in the magnet through magnet segmentation. This technique is frequently employed to enhance the efficiency of Permanent Magnet Synchronous Motors (PMSMs). In this study, the objective is to improve the efficiency of this technique through the appropriate selection of segmentation parameters, specifically focusing on the shape of the segmented magnet. To achieve this, a constrained optimization process based on a genetic algorithm method is employed. Next, the goal is to analyse the eddy current loss, which can be reduced by adding a shielding conductive cylinder around the magnets.

The finite element method was used to analyse the eddy current loss in the machine under consideration.