Marine propulsion and power system are independent but complementary, forming a complete power system. The shaft generator system is a reliable bidirectional energy conversion equipment that connections propulsion power and ship power, enabling a flexible and efficient ship hybrid power system.

For long-distance vessels such as container ships, bulk carriers, oil tankers, and automobile transport ships, their propulsion power is usually provided by efficient two-stroke low-speed diesel engines. Reducing operational fuel consumption and emissions is the direction for continuous improvement and enhancement of their power systems. The shaft belt motor system can fully utilize the surplus power of the propulsion engine for power generation, improving the energy efficiency level of the ship.

The shaft belt system of ocean going ships usually operates in the shaft belt power generation mode, where the propulsion main engine drives the shaft mounted generator to supply power to the ship's power station. With the changes in ship speed and sea conditions, the speed of the propulsion main engine and corresponding shaft motors constantly changes, while the ship power station needs to maintain constant voltage and frequency power supply. The shaft motor system can achieve constant frequency and voltage power output when variable speed input is equipped with an inverter.