Fluid Dynamic-based Pole Shaping for Electrically Excited Synchronous Motor

This paper presents a novel approach to achieve optimal pole shaping in Electrically Excited Synchronous Motors (EESM). The study begins by introducing a new excitation pole design and explaining the equations used to design it. The proposed geometry incorporates fluid dynamic equations to shape the rotor pole body and pole shoe while the airgap design follow the electromagnetic aim to maximize the sinusoidal flux density while minimizing spatial harmonic content. The optimal design process involves the implementation of a magnetic network that satisfies flux density limits at the yoke, body, air gap, and rotor current density requirements. This process is carried out for both the traditional and fluid-based pole shaping geometries. A deeper comparison is then conducted, considering the electromagnetic, fluid dynamics, and mechanical performance aspects of both designs. To validate the performance of the proposed geometry, finite element simulations are employed. The results demonstrate the effectiveness of the new solution in achieving improved motor performance. Overall, this research contributes to the advancement of pole shaping techniques in EESMs, offering potential enhancements in various performance metrics.