Japanese companies Mitsui E&S and Taiyo Electric have completed the joint development of the ‘Overhang Permanent Magnet Shaft Generating System’ for large marine engines.
Unlike Taiyo Electric’s conventional shaft generators installed on intermediate shafts, this new system is mounted on the fore end of the main engine, a configuration which minimises the impact on engine room layout and stern hull design, contributing to improved fuel efficiency and enhanced energy-saving performance. In addition, the engine and generator can be ordered and delivered as a single package, helping reduce the workload for shipyards during installation and outfitting.
The system adopts a permanent magnet generator, which offers higher efficiency and a more compact and lightweight design compared to conventional wound-rotor types. The reduced number of periodically replaced components is expected to contribute to improved maintainability. In addition to PTO, the system supports engine-assist operation through PTI (driving the generator as a motor) providing supplemental propulsion power when required. This enables the system to support stable vessel operation even under adverse weather conditions or in situations where additional acceleration is needed.
Mitsui E&S and Taiyo Electric will continue to expand the application of this system and enhance their service capabilities, thereby contributing to the reduction of GHG emissions and further energy efficiency in vessel operations.
Image: Overhang permanent magnet shaft generating system (source: Mitsui E&S)
