... rotor never goes to over speed and has stable control; 3-25m/s wind speed, wind turbine can run smoothly.3. Direct drive ... has aerodynamic brake, electric magnet brake, mechanical brake and manual stop mechanism.5. Sealed slip ring, no cable twist;6. Streamline ... , blade will lose it aerodynamics, start mechanical brake to stop wind turbine.Introduction of 10kw pitch controlled wind turbine10kw pitch ...