Design and analysis of a low speed and high power permanent magnet synchronous motor for a ship’s pod

Abstract

Abstract The route between Gothenburg Port and Frederikshavn Port requires a ship propulsion system capable of delivering 200 kNm torque at 75 RPM. A Permanent Magnet Synchronous Motor (PMSM) is designed for this purpose, with Motor-CAD employed for comprehensive simulations, including geometric design and parameter optimization. The motor, rated at 1568 kW with a maximum current of 800 A, incorporates advanced design considerations to enhance performance. Magnet material selection plays a crucial role in determining the motor’s efficiency and losses. A comparison between the ferrite and the neodymium magnets reveals that the neodymium achieves a higher efficiency of 95.9% compared to 94.1% for the ferrite. Additionally, the neodymium results in significantly lower total losses of 64.19 kW, compared to 95.34 kW for the ferrite, demonstrating superior electromagnetic performance. To address thermal challenges, seawater heat dissipation is implemented as an effective cooling strategy, ensuring optimal system performance. Mechanical stress simulations further guarantee the safety and reliability of the vessel. A life cycle assessment (LCA) evaluates the environmental sustainability of the propulsion system, covering every phase from material selection to decommissioning. This work integrates thermal management, structural analysis, and sustainability to deliver an efficient and environmentally friendly marine propulsion system, offering valuable insights for the development of next-generation ship technologies.