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Neodymium-iron-boron magnets used in wind turbines are the core functional materials in permanent magnet synchronous generators (PMSGs). Their selection not only affects power generation efficiency but also directly impacts the overall structural design and cost control of the unit. The quantity, shape, and performance parameters of the magnets must be closely matched to the motor design, making them typical custom-made products.
Regarding the number of magnets required, the quantity needed for a wind turbine is closely related to the number of pole pairs, rotor diameter, and power rating. Generally, small wind turbines may require only a few dozen magnets, while large direct-drive wind turbines can use up to several hundred.
Regarding magnet shape, arc-shaped and wedge shaped magnets are predominant in wind turbines. This design is intended to conform to the large-diameter rotor structure and ensure uniformity of the air gap magnetic field. In practical applications, special-shaped magnets—such as trapezoidal, segmented arc-shaped, or chamfered designs—are also employed based on the motor’s topological structure to optimize flux distribution and reduce cogging torque.
Schematic of Custom-Shaped Special Segmented Arc-Shaped NdFeB Magnets
In terms of performance requirements, neodymium-iron-boron magnets for wind power applications typically use high-performance sintered materials, such as grades N38SH, N40UH, and higher. These magnets not only feature a high energy product (BHmax) but also possess a high intrinsic coercive force (Hcj), enabling them to maintain stable magnetic properties in operating environments above 150°C and prevent irreversible demagnetization. Additionally, to withstand harsh environments such as offshore wind power, they must exhibit excellent corrosion resistance, typically achieved through coatings such as nickel plating or epoxy.
The above provides an overview of neodymium magnets used in wind turbines. These magnets have become a critical foundational material for achieving high efficiency and reliability in wind turbines. If your company requires segmented magnets for motors or multi-pole integrated magnetic rings, please feel free to contact our website customer service.
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