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Successful development of the first large permanent magnet motor in HUST


permanent magnet machine

On June 9, the first large-scale integrated permanent magnet machine magnetization equipment jointly developed by Huazhong University of science and technology national high intensity pulsed magnetic field Science Center (hereinafter referred to as high-intensity magnetic field center) and Xiangtan Electric Co., Ltd. (hereinafter referred to as Xiangtan Electric Co., Ltd.) completed the integral magnetization of 2.5MW direct-drive permanent magnet wind turbine rotor in Xiangtan Electric Co., Ltd, The magnetized permanent magnet wind turbine has passed the type test, and all test indexes meet the product technical requirements, which indicates that China has made a breakthrough in the overall magnetization technology of large permanent magnet motor, and the development level of related technology and equipment ranks in the forefront of the world.


The rotor diameter of a permanent magnet wind turbine is more than 4.3 meters and the height is up to 1.5 meters. There are 84 permanent magnet poles in total, and each pole is assembled by more than 20 magnetic steel blocks. In the traditional manufacturing process, it is usually necessary to magnetize a single magnetic steel block to make it magnetic, and then manually assemble it to the rotor surface. The assembly of magnetic steel is difficult, which affects the assembly quality of the magnetic pole, and the operation is dangerous and the production efficiency is low. After using the integral magnetization technology, the magnetic steel can be easily assembled without magnetism, and then the integral magnetization equipment is used for the integral magnetization of the rotor permanent magnet pole. This technology successfully reduces the difficulty of assembly, improves the assembly accuracy, increases the production efficiency by more than 8 times compared with traditional manufacturing, and greatly improves safety. Compared with the same type of foreign products, the magnetization equipment can realize the magnetization of one whole magnetic pole at one time, instead of multi-stage magnetization, which avoids the local demagnetization caused by the stage magnetization process and further improves the production efficiency.


 permanent magnet machine


The overall magnetization technology was first proposed by Professor Li Liang, director of the high-intensity magnetic field center. It is an important application of the high-intensity magnetic field center to combine the high-intensity magnetic field technology with the major national needs. Under the leadership of Professor Li Liang, the R & D team of high-intensity magnetic field centers is composed of teachers and students such as LV Yiliang, Ding Hongfa, and Yang Yuping. The R & D team of Xiangdian Co., Ltd. is composed of senior engineer Liu Heming, deputy general manager, and engineering and technical personnel such as Zhu Limin, Zhang Wenge, and Cheng Han. They have worked together to open up the application channel of overall magnetization technology in engineering products. At the experimental site, Zhou Jianjun, chairman of Xiangdian Co., Ltd., stressed: "this is a model of university enterprise cooperation, which is problem-oriented, focuses on the pain points of low production efficiency and high production safety risk in the manufacturing process of large-scale products, adopts new technologies and processes, implements accurate policies, and strives to achieve the landing of scientific research and application scenarios."


Due to the advantages of high power density, permanent magnet motors are widely used in wind power generation, electric vehicles, household appliances, industrial drive and control, and the market potential is huge. In terms of wind power generation, China's existing onshore wind power installed capacity is 230 million kilowatts, which will reach 670 million kilowatts by 2030, and offshore wind power technology development potential is more than 2 billion kilowatts. Wind power generation will contribute to China's goal of achieving carbon neutrality by 2060. In terms of electric vehicles, by the end of 2020, the number of vehicles in China will reach 281 million, with only 4 million electric vehicles, accounting for 1.4%. China's "new energy vehicle industry development plan (2021-2035)" points out that by 2035, "pure electric vehicles will become the mainstream of new sales vehicles, and public sector vehicles will be fully electric". Britain, the Netherlands, and other countries, as well as major automobile companies, have also proposed plans to ban the sale of fuel vehicles around 2030.



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