In many application fields such as offshore wind turbines, electrified transportation, and ship propulsion, permanent magnet wind generators play a critical role. So what challenges does this key technology currently face? And what challenges and opportunities lie ahead for its future development?

I. Industry Challenges

The permanent magnets in permanent magnet wind generators inherently possess magnetic properties, generating both attractive and repulsive forces. This creates significant difficulties in the production process of the magnetic poles, requiring multiple workers to operate with the assistance of specialized assembly tooling.

Since each magnetic pole is composed of multiple small-sized, independently magnetized permanent magnets, it is difficult to ensure consistency in the magnetic parameters of the poles, which in turn affects the overall performance of the permanent magnet wind generator.

Multiple workers are required to install the magnetic steel together.

Completed wind turbine generators are prone to malfunctions due to harsh outdoor operating environments, rotor blockage, bore sweeping, and other issues. These problems can cause high-temperature demagnetization of the rotor magnets, affecting the generator's power generation efficiency and even rendering it inoperable due to demagnetization. Moreover, most wind turbines are installed in remote, sparsely populated areas. Once a fault occurs, returning the unit to the factory for repair is not only costly but also time-consuming, often taking several months—significantly impacting the economic benefits of the wind farm.

1. Permanent Magnet Rotor Production Stage
Magnetic pole assembly efficiency can be increased by 5 to 10 times.

2. Material Recycling Stage
Demagnetization time is shortened to 1 second, energy consumption is reduced by two orders of magnitude, and there is no pollution whatsoever.

3. Operation and Maintenance Stage
A vehicle-mounted pulsed magnetic field generation device can be brought to a maintenance site near the wind farm, completing the entire magnetic pole remagnetization operation within the same day.

The company's integral magnetization and demagnetization technology significantly enhances magnetic pole performance. It enables single-shot integral magnetization of a complete magnetic pole, ensuring consistent magnetization intensity and saturation level across the pole, resulting in a more uniform air gap magnetic field. During transportation, storage, and packaging, the technology allows for non-magnetized transport, at least doubling the single-load capacity.

Currently, the company's products have been applied to permanent magnet wind generators such as CRRC Yongji's 20 MW and Dongfang Electric's 26 MW units, pioneering a transformative technical route for the efficient manufacturing of large-scale permanent magnet wind turbines.

Conclusion

According to forecasts by the National Energy Administration, the installed capacity of wind power is expected to nearly double by 2030 compared to the current level. Therefore, improving the performance and enabling green remanufacturing of large-scale permanent magnet wind generators have become critical demands for the high-quality development of China's industrial sector. Cimai Electric (Dongguan) Co., Ltd. is committed to driving this high-quality development forward.