This project is a comprehensive technological innovation project in the field of motor system energy conservation. It includes multiple key projects such as the national science and technology support plan and the formulation of national standards. It is funded by government funds and is the implementation of energy conservation during the national "Eleventh Five-Year Plan" and even the "Twelfth Five-Year Plan" period. Key areas of concern of the national policy of emission reduction. The project aims to solve the urgently needed common and key technologies in the implementation of energy conservation in motor systems. It involves the main AC motor products such as efficient and ultra-efficient motors mentioned in the motor system energy conservation project. The key technologies involve the development and application of new materials, new processes, and new technologies., multi-professional large-scale comprehensive technological innovation research such as high-efficiency motor design technology and testing technology that are in line with international standards, which is large in scale and difficult. The project proposes measures to reduce various losses in AC motors, and grasps the core technologies for the design and manufacturing of efficient, ultra-efficient and energy-saving motors that meet the new IEC energy efficiency standards. Adopting a new independently developed fan and optimizing its structure, the ventilation loss of the external fan is reduced; through the study of motor loss distribution and wind speed and air volume, combined with the verification test of fan size, the relationship between temperature rise and stator and rotor copper loss and mechanical loss is solved; selecting appropriate groove matching and motor air gap to reduce additional losses; adopting different brands of cold-rolled silicon steel sheets and studying their punching and shearing processes to reduce iron loss and additional losses; Optimizing the bearing configuration and determining the bearing specifications and working clearance according to the load distribution effectively reduces the mechanical loss of the motor; innovatively adopting a new double-layer concentric grouped coil to reduce the stator copper loss; at the same time, major breakthroughs have been made in additional loss testing technology, etc., overcoming the key technology of the "Uncertainty Evaluation Method" for motor efficiency, and innovatively developing the first set of low-uncertainty motor testing device with independent intellectual property rights in China; By comparing the IEEE 112B method and two test methods for estimating additional losses based on the input power of 0.5%, the influence of winding loss temperature correction and measured additional losses on the stator and rotor copper losses of the motor is found out, which improves the test accuracy; The additional loss calculation program based on time-stepped finite element is completed, which makes up for the shortcomings of estimating additional losses in traditional motor design. Novelty search and expert appraisal show that the efficiency of the two independently innovated series of motor products YE2 and YE3 have reached the IE2 and IE3 levels in the IEC60034 -30 energy efficiency standard respectively, and the comprehensive level is internationally advanced. The project has achieved many innovative results, applying for a total of 13 patents (5 invention patents and 8 utility model patents) and 2 software copyrights; published 10 papers in core journals at home and abroad; and formulated 3 national standards. The social and economic benefits of the project are significant. Calculated by a 3% increase in the average efficiency of YE2 high-efficiency motors, the annual power saving reaches 59.5 billion kilowatt-hours; calculated by a 4.5% increase in the average efficiency of YE3 ultra-efficient motors, the annual power saving can reach 89.2 billion kilowatt-hours., It plays an immeasurable role in solving the energy bottleneck constraints of economic and social development and achieving the important goal of reducing carbon emissions per unit of GDP by 40-45% by 2020. Through the industry-university-research cooperation model, the project unites many companies to participate in the rapid industrialization of technological achievements. It has strong market competitiveness and a high degree of industrialization. The research results, key technologies and drawings of independent innovation have been transferred to 29 small and medium-sized motors. Key production enterprises and built 29 pilot test lines and production lines, which can realize mass production of motors and product performance testing. The direct economic benefits from technology development and transfer reached more than 10 million yuan, forming a R & D and testing base dominated by Shanghai Electrical Science Research Institute (Group) Co., Ltd. Low motor efficiency uncertainty testing equipment is used as necessary test equipment for motor production enterprises to optimize design and product quality supervision. It is conducive to improving the company's new product research and development capabilities. It has initially formed a test system production and complete set capacity with an annual output value of 30 million yuan. The system has been promoted to more than 20 production companies and professional testing institutions in the motor industry, and will be gradually promoted to the entire motor industry. The key technologies obtained by the project are of great significance to improving the overall technical level of my country's motor industry.