HW9Z series high efficiency environmental protection fully closed shaft generator is optimized and updated on the basis of normal shaft generator, and adopts fully closed design, and protective class reaches IP55, which solve the problem of traditional generator that can be easily damaged because of poor sealing property, damp, mould, salt fog and so on. It operates well within the speed range from 1050r/min to 1800r/min, and has the characteristic of low voltage variety and high reliability. It applies to small and medium vessel, and is driven by main engine, which save user’s engine and space. At present, the optional rated power range of high efficiency environmental protection fully closed shaft generator is from 16kW to 60kW.