In order to realize a decarbonized society, we are proposing the concept of an electric propulsion system with flexibility to meet various needs as one of the solutions to reduce CO2 emissions from ocean mobility for society as a whole. We designed and conducted performance verification a contra-rotating rim-driven propulsion system that reduces the design constraints of ship configuration and has robust propulsion performance under operating conditions. The rim-driven propulsion system does not have a drive shaft and mounts the propeller blades inside the motor. The system is characterized by its compactness. By applying contra-rotating technology and other elements to this propulsion system, we aimed to achieve high propulsion performance under a wide range of operating conditions. Following the verification, we confirmed that the contra-rotating rim-driven propulsion system has improved propulsion performance compared to a propulsion system that adapt to a wide range of conventional operating conditions, as typified by a nozzle propeller.
