The WindTC™ is the only torsional control on the market that treats forward and reverse torques differently. When a drivetrain’s inertias get out of sync (which field work has shown occurs much more often than commonly believed), the WindTC can quickly damp the reversal and limit the damaging effects. Stock torque limiters cannot react below their high forward setting, thus allow these shock loads to go through the gearbox and the rest of the drivetrain. Most importantly, the WindTC minimizes the significant torque reversal impact at the end of a hard stop. This final impact load occurs AFTER THE TURBINE HAS STOPPED ROTATING and is likely significant driver in damage to turbine components.
With the WindTC, the transients are damped before they can allow the drivetrain to torsionally unload. As a torsional “shock absorber” in the system, an asymmetric approach can react almost instantly to reduce the transients. The wind-up of the system can be reduced, thus preventing high damaging loads. The addition of an asymmetric device in existing turbines is a major step in extending the life of drive components.
The WindTC™ is the only torque limiter that is effective in mitigating the damaging loads on the wind turbine gearbox from harsh negative torque. These loads are particularly bad for gearbox bearings in the turbine as the sudden shock loads do not allow time for the rollers to reposition as they accelerate into the load zone. This can cause skidding and edge loading of the rollers and can cause a damaging impact load on the inner race. With a Wind TC in the system, reversal loading is reduced to a significantly lower level, allowing for gears, rollers and races to be protected when they are at the highest risk.
Easily mounted on the shaft between the generator and the turbine motor, using the existing spacer shaft, the WindTC™ significantly cuts transient torque spikes.
“We inspected these (gearboxes) last June at their 3 year mark. The boxes showed no signs of wear whatsoever. Other than gear mesh marks, they looked brand new…If the limiters extend the life even 6 months, we come out even. If they add a year to the life, I doubled my money by installing them. I believe the limiters add 12 to 24 months of life to the boxes (this is a VERY conservative estimate)” – Site Manager