Design of a Linear Yoke-less Permanent Magnet Synchronous Machine Employing GO Steel for Enhanced Efficiency and Cost Reduction

This study proposes a design approach that applies grain-oriented(GO) electrical steel sheet as a means to improve both the cost and efficiency of a yoke-less linear permanent magnet synchronous motor(LPMSM). Conventionally, LPMSM are designed and manufactured using non-grain-orient(NGO) electrical steel sheet, and thinner laminations are typically employed to enhance performance and efficiency. Although thin laminations offer favorable loss characteristics by reducing eddy-current losses, their high material cost increases the overall system price. In this study, we propose a design method that improves thrust and efficiency even when using thicker GO steel, which is generally less expensive than thin NGO steel. The potential cost advantages and performance benefits of the proposed are verified through electromagnetic design and finite element analysis(FEA).