Design and Performance Characteristics of a High-Speed IPM Synchronous Motor for Marine Diesel Engine EGR Blowers

The EGR system is a critical solution for NOx emissions in marine diesel engines. A key component of this system is the driving motor for the EGR blower, which must satisfy demanding operational requirements, including enhanced efficiency, improved rotor shaft stability during high-speed operation, and strict saturation temperature limits. In this study, a high-speed IPMSM utilizing SmCo permanent magnets is proposed to achieve high efficiency and a compact, lightweight design. The proposed IPMSM is designed with rated speed of 9,000rpm, max speed of 12,500rpm, and rated output-power of 150kW. The electromagnetic characteristics were analyzed using the FEM. To validate the design, a prototype IPMSM was fabricated and integrated into an EGR blower system. Finally, the performance characteristics were evaluated and discussed in relation to key electrical and mechanical design parameters.