01 / Overview
Application Overview
Permanent-magnet wind generators use magnets arranged around a rotor. Magnet quantity and mass depend on the generator topology, speed and geometry; direct-drive and geared designs cannot be assigned one mass-per-megawatt rule. Corrosion protection and access for maintenance influence the assembly design.
02 / Material
Why NdFeB for Wind Turbines
NdFeB can provide high field within a restricted generator volume. Compare the generator’s magnetic output, losses and maintenance requirements with the alternatives at the system level.
03 / Specifications
Key Design Requirements
Corrosion durability
Qualify the complete coating and encapsulation for the actual humidity, salt exposure and thermal cycling.
Temperature stability
Use the magnet temperature map and hot curves for normal duty and fault conditions.
Block-to-block uniformity
Define the field or magnetic-moment test and acceptance limits for the generator design.
Dimensional precision
Agree critical faces, coating allowance and assembly tolerances on the drawing.
Service life
Set a project-specific life requirement and validation plan. Salt-spray hours cannot be converted directly to years in service.
04 / Grade Selection
NdFeB grade references for Wind Turbines
These educational references do not establish supply or thermal suitability. Review the actual hot curves, load line, opposing field and duty cycle before selecting a grade.
N42SH
150°C class · Super High Temperature (SH)N42SH reference: 40–43 MGOe at 20°C, with a nominal 150°C temperature class.
Reference; drawing review required
N45SH
150°C class · Super High Temperature (SH)N45SH reference: 43–46 MGOe at 20°C, with a nominal 150°C temperature class.
Reference; drawing review required
N42UH
180°C class · Ultra High Temperature (UH)N42UH reference: 40–43 MGOe at 20°C, with a nominal 180°C temperature class.
Reference; drawing review required
N45UH
180°C class · Ultra High Temperature (UH)N45UH reference: 43–46 MGOe at 20°C, with a nominal 180°C temperature class.
Reference; drawing review required
05 / Geometry
Typical Magnet Configurations
- Blocks retained on the rotor periphery
- Curved tile assemblies matched to the rotor radius
- Skewed or segmented arrangements evaluated for the required waveform
Typical dimensions
Block and tile sizes, segment count and total magnet mass come from the generator drawing and bill of materials.
06 / Engineering Notes
Design & Procurement Considerations
- 01Specify coating stack, thickness, preparation and acceptance criteria before comparing corrosion results.
- 02Confirm production capacity and delivery against the actual quantity and manufacturing route.
- 03Review coating and enclosure protection together, including damage during assembly.
- 04Keep material and lot records required by the customer and applicable product rules.
07 / Resources
Further Reading
Technical
NdFeB Magnet Coatings: Specify and Test the Complete System
Compare NiCuNi, epoxy, zinc and parylene against the actual environment, assembly and inspection requirements.
Technical
Grain Boundary Diffusion: Magnetic Results and Part Qualification
A reported N45H magnetic comparison and a separate historical Dy-reduction example support different conclusions.
Market Update
China Rare Earth Export Controls: Item Classification and MOFCOM Licensing
Review the actual magnet or assembly, composition, exporter, parties and end use. A grade name does not determine the licensing outcome.
08 / Compare
Related Engineering Comparisons
Comparison
NiCuNi vs Epoxy
NiCuNi is a metal plating stack; epoxy is a polymer coating that may be applied over a specified base layer.
Comparison
Radial Multi-pole vs Arc Segment
A radial ring has one magnetic body; a segmented rotor uses separate magnets. Compare the waveform and assembly in the actual motor.
FAQ / Questions
Frequently Asked Questions
How much NdFeB is used in a wind generator?
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The generator’s bill of materials determines the quantity. Use a named model and topology for any mass example; generator power alone is insufficient to calculate magnet mass.
What NdFeB grade is used in direct-drive wind generators?
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Compare the required field with material curves at the generator’s working temperatures and opposing fields. SH and UH references can help define the evaluation, but they do not establish a universal minimum or additional corrosion resistance.
How are NdFeB magnets protected from corrosion in wind applications?
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The design may combine a coating with encapsulation or an enclosure. Validate the finished system under the intended exposure and thermal cycling. ASTM B117 defines a salt-spray method; the product acceptance time and failure criterion must be agreed separately.
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