A renowned Danish wind energy company developing direct-drive permanent magnet synchronous generators for their new generation 8MW offshore wind turbines, facing critical technical challenges:

• Each unit required over 2 tons of NdFeB magnetic steel, with magnetic decay <5% over 25-year design life
• High salt spray marine environment, must resist C5-M offshore atmospheric corrosion classification
• Generator operating temperature 80-120°C requiring excellent thermal stability
• Must pass IEC 61400-21 grid compatibility certification and DNV-GL type certification
• Initial order for 500 wind turbine sets of magnetic steel, total value exceeding $8 million

Vision Plastics Magnetoelectricity established a dedicated technical team providing comprehensive magnetic circuit solutions:

• N40SH grade NdFeB magnetic steel selected, balancing performance and cost
• Energy Product: 40 MGOe ensuring high power generation efficiency
• Intrinsic Coercive Force: 20 kOe providing excellent demagnetization resistance at 120°C
• Remanence Temperature Coefficient: -0.11%/°C, adapting to Nordic cold to generator operating temperature conditions

• Proprietary marine-grade protection: Ni-Cu-Ni base + epoxy sealing + polyurethane topcoat
• Passed 3000-hour salt spray testing, achieving C5-M anti-corrosion classification
• Coating adhesion ≥15MPa, impact strength ≥50kg·cm

• Arc magnet dimensional tolerance: ±0.05mm ensuring uniform air gap
• Magnetic field uniformity ≥98%, reducing generator harmonic losses
• 100% magnetic flux detection with complete traceability records

• 6-month strategic inventory established, hedging rare earth price volatility
• Monthly capacity 5,000 sets, meeting customer delivery schedule
• Danish technical service center providing localized support

• Performance Verification: First batch prototypes passed DNV-GL full type testing, generator efficiency reached 96.8%, exceeding design target by 0.3%
• Reliability Data: Accelerated aging test (120°C*3000h) showed only 1.2% magnetic decay, projecting <4% decay over 25-year life
• Corrosion Verification: After 3 years operation in North Sea offshore wind farm, zero corrosion on magnetic steel, 100% coating integrity
• Economic Benefits: High energy product enabled 12-ton generator weight reduction, reducing tower foundation costs by 8%
• Delivery Performance: First 200 units delivered on schedule, helping customer win Hornsea offshore wind farm order in UK
• Strategic Partnership: Signed 5-year framework agreement, becoming sole Asian magnetic steel strategic supplier for this customer

Through the high performance of N40SH grade, marine-class anti-corrosion coating system, and precision manufacturing processes, Vision Plastics Magnetoelectricity successfully entered the European offshore wind power core supply chain. This case validates the long-term reliability of NdFeB magnets in extreme marine environments, demonstrating the critical requirements for high-stability magnetic steel in large megawatt-class wind turbines. As a Chinese magnetic materials enterprise, we not only provided quality products but also won long-term trust from international top-tier wind energy companies through localized technical services and supply chain assurance, laying a solid foundation for expanding into the global renewable energy market.