Recently, Huazhong University of Science and Technology made an important announcement. Professor Li Liang, heading a team at the National Pulsed Magnetic Field Science Center, has achieved a significant milestone. The team has successfully carried out in-situ demagnetization and re-magnetization of a 26-megawatt large permanent magnet wind turbine. This comes after their previous accomplishment
Recently, Huazhong University of Science and Technology made an important announcement. Professor Li Liang, heading a team at the National Pulsed Magnetic Field Science Center, has achieved a significant milestone. The team has successfully carried out in-situ demagnetization and re-magnetization of a 26-megawatt large permanent magnet wind turbine. This comes after their previous accomplishment with a 20-megawatt turbine in September 2023, signifying remarkable progress in the area of green remanufacturing for decommissioned large permanent magnet wind turbines.
Permanent magnet wind turbines are the predominant type in China's wind power generation sector. The core component, the permanent magnetic pole, is constructed by assembling numerous magnetic steels. Owing to their inherent magnetic characteristics and mutual repulsive forces, the traditional manufacturing process, which involves magnetizing the magnets prior to assembly, has faced difficulties such as complexity and low efficiency. To overcome these challenges, Professor Li Liang's team has introduced an innovative concept. They proposed that the components be assembled without magnets first and then be subjected to overall magnetization.
Professor Li Liang further elaborated that both the maintenance and recycling of decommissioned permanent magnet wind turbines necessitate demagnetization treatment. The existing methods that involve heating the entire machine consume a large amount of energy, cause environmental pollution, and also pose a risk of damage to the parts. The team's proposed in-situ charging-discharging technology can complete full demagnetization in just over 100 milliseconds through discharge. The demagnetized materials can then be reprocessed according to new requirements and re-magnetized into new poles for repeated utilization. This achievement has already been implemented at Dongfang Electric Corporation’s Dongfang Motor Company, demonstrating its practical value and potential impact on the wind power industry's sustainable development.