... Aerodynamic brake 3. Maintenance free 4.Long life on-grid wind turbineTouch screen interface, GPRS remote control, Hydraulic brake, fail- ... at optimum TSR, run in high efficiency; over rated wind speed, wind rotor never goes to over speed and has stable ... control; 3-35m/s wind speed, wind turbine can run smoothly.3. Direct drive permanent magnet generator, low startup resistance moment, ...