Working Principle of Wind Turbine Brake Pads
Yaw BrakingThe hydraulic system applies pressure to drive the piston, and the friction pads contact the brake disc to generate braking torque for locking the nacelle. When pressure is relieved, the return spring disengages the friction pads to ensure drag-free operation.
High-Speed Shaft BrakingNormally open by design. Triggered hydraulically in emergencies, multiple sets of friction pads clamp the brake disc under enormous pressure, converting kinetic energy into thermal energy for rapid shutdown.
Safety MechanismWorks in conjunction with aerodynamic braking (pitch system). The pitch system first reduces wind energy capture, followed by final locking via mechanical braking, avoiding the risk of single-system failure.
Material Types and Characteristics
Wind turbine brake pads must withstand extreme environments (-40°C ~ +700°C), high loads and frequent braking. The mainstream materials are as follows:
| Material Type | Composition | Core Advantages | Application Scenarios | Limitations |
|---|---|---|---|---|
| Sintered Metal-Based (Mainstream) | Copper-based / iron-based powder metallurgy, containing graphite, sulfide | High temperature resistance (0~700°C), stable friction coefficient, low wear | High-speed shaft / main shaft braking | High cost, slight wear on the brake disc |
| Resin-Based Composite | Resin + carbon fiber / aramid fiber + filler | Low noise, smooth braking, low disc damage | Yaw system | Poor high-temperature stability |
| Carbon-Ceramic-Based | Carbon fiber reinforced ceramic | Ultra-high strength, minimal friction coefficient decay, long service life | High-load units above 3MW | Expensive |
| Polymer Material | Modified PEEK/PPS | Self-lubricating, excellent weather resistance, corrosion resistance | Yaw system | Not suitable for high-load braking |
