The first domestically produced nuclear power 1E-class emergency diesel generator was developed by Shanghai Electric Group Shanghai Electric Machinery Factory Co., Ltd. It adopts a hidden pole synchronous generator structure, the exciter is an AC exciter, and the secondary exciter is a permanent magnet AC generator. Except for bearings and bearing cooling pump systems, all components and raw materials have been localized. Nuclear power plant Class 1E emergency diesel generator is equipment that provides emergency power supply to nuclear power plants. The generator can be safely and reliably started and operated under specified environmental conditions and earthquake loads, and when loaded according to specified loading procedures during and after the accident, providing corresponding power for various emergency equipment. Compared with conventional motors, the main characteristics of this motor are: 1. It belongs to Class K3 electrical equipment on the nuclear island, meets the 1E safety requirements of nuclear power plants, meets the requirements of relevant national regulations, and has passed national identification; 2. The motor has special structural performance, good overall structural strength, and the ability to withstand several asynchronous parallel connections (non-synchronous grid connection)(required to withstand 15 times the maximum rated torque, and this product can withstand 20 times); 3. Highly optimized electromagnetic scheme and advanced motor parameters meet the loading sequence time of the nuclear power plant emergency system and the emergency power grid voltage drop requirements (X"d<12%, this product achieves 9%); 4. The motor has high reliability, has a long service life (40 years, 60 years after identification), and can be safely, normally and quickly started and operated with load in various accidents in and after accidents (OBE, SSE) in nuclear power plants (starting time is 10 seconds, It can reach full load within 40 seconds); this motor product has the following innovations and technological breakthroughs in structure: 1. The stator frame adopts a three-stage stator frame, open ventilation method, and brushless excitation (simple structure, convenient installation and maintenance); 2. The rotor damping system adopts a special structure full damping system (which can greatly improve motor performance and operating stability); 3. The cooperation between the rotor core and the shaft adopts a special combination key with independent patented technology (special fixing method, simple and reliable); 4. The moment of inertia of the motor rotor is small, and the motor starts at a fast speed (providing faster starting speed for emergency situations to meet needs); the successful development of the first domestic TFHY series nuclear power plant 1E-level emergency diesel generator has high technical added value and has reached the advanced level of similar foreign products, and currently monopolizes all domestic similar product markets. This product has sufficient technical competitiveness in the domestic market and can completely replace similar imported products. It has cooperated with foreign units to create greater economic and social benefits for users and enterprises. In addition, through the development of this project, Power Supply Company has further improved its nuclear power quality assurance system, deepened its nuclear power culture, and laid a solid foundation for future nuclear power product manufacturing and ensuring nuclear power quality. At the same time, Shanghai Electric Group Shanghai Electric Machinery Factory Co., Ltd. can meet the requirements of mass production in terms of technology, tooling, testing and other aspects.