Watch the blades at the noisy but they are reversing not by stalling (increasing angle of attack) the blades but reversing them. The turbine is acting as a propeller against the wind...
All turbines have mechanical brakes, for holding them stopped in wind, and they may also be able to emergency stop the turbine, don't underestimate engineering.
Could also slow the blades with the generator either feed in reverse current, or just short our the field windings, different method same result.
Its called active stall. You can create massive amounts of drag by pitching blades further into the wind rather than pitch out which takes more time. If you applied the brake to a full speed rotor the brake wouldn't do shit. The amount of torque on the high speed shaft would just burn straight through the brake. I love Enercon machines, no gearbox, its beautiful.
The machine has an emergency brake. They work in conditions that exceed normal operation. For normal operation, the orientation of the blades is the only system used. The use of brakes would cause a loss of energy that is to be avoided. For the overspeed test you can see on the video, the rotation speed was 25 rpm while in normal operation, this machine does not exceed 19.5 rpm. Brakes have been used to rapidly reduce the rotational speed of 25 to 0 rpm.
The turbine is only stopped by pitching the blades to 90° position... the holding-brake is normally not used to stop the rotor. Only if someone pushs the emergency-stop button or manually enables the brake.
I dont think there are any "breakes", im pretty sure it just tilts the blades so they are parrallel with the wind so they stop rotating. i think it also slows down fast due to the wings going against the rotational direction of movement creating high wind resistance. pretty smart
Watch the blades at the noisy but they are reversing not by stalling (increasing angle of attack) the blades but reversing them. The turbine is acting as a propeller against the wind...
All turbines have mechanical brakes, for holding them stopped in wind, and they may also be able to emergency stop the turbine, don't underestimate engineering.
Could also slow the blades with the generator either feed in reverse current, or just short our the field windings, different method same result.
kadmow 3 weeks ago
What a waste of expensive non renewable wind :(
knurri 2 months ago 2
Its called active stall. You can create massive amounts of drag by pitching blades further into the wind rather than pitch out which takes more time. If you applied the brake to a full speed rotor the brake wouldn't do shit. The amount of torque on the high speed shaft would just burn straight through the brake. I love Enercon machines, no gearbox, its beautiful.
baur02 3 months ago
The machine has an emergency brake. They work in conditions that exceed normal operation. For normal operation, the orientation of the blades is the only system used. The use of brakes would cause a loss of energy that is to be avoided. For the overspeed test you can see on the video, the rotation speed was 25 rpm while in normal operation, this machine does not exceed 19.5 rpm. Brakes have been used to rapidly reduce the rotational speed of 25 to 0 rpm.
Losinable 6 months ago
@Losinable
The turbine is only stopped by pitching the blades to 90° position... the holding-brake is normally not used to stop the rotor. Only if someone pushs the emergency-stop button or manually enables the brake.
easyci 6 months ago
I dont think there are any "breakes", im pretty sure it just tilts the blades so they are parrallel with the wind so they stop rotating. i think it also slows down fast due to the wings going against the rotational direction of movement creating high wind resistance. pretty smart
gaypotter 6 months ago
those sound like jedi's blades
rodstartube 7 months ago
what kind of brake decelerates the wings that fast?
UnowMe00 10 months ago
@UnowMe00 disc brake
charlou3 8 months ago
This has been flagged as spam show
@charlou3 They must be burning!
UnowMe00 8 months ago
WTF was the big noise at the ending?
MrTheFanMan111 10 months ago
@MrTheFanMan111 The big noise at the ending is due to brakes.
Losinable 10 months ago
@Losinable OH they are LOUD LOL
MrTheFanMan111 10 months ago
@Losinable - Is it a friction brake or does it "feather" the blades. (To use pilot speak.)
aaron8862006 7 months ago