S-curve-control for active load peak damping in the drive train

Comminuting processes cause stochastic loads with high amplitudes in the electromechanical drive train. In the long run, peak loads cause premature material fatigue of the drive components alongside high thermal loads in the asynchronous machine. Furthermore load peaks arise in the supply grid, which leads to higher overheads (demand charge). A new drive train with a novel non-linear speed control (SC-control) was developed based on the operating performance of commercial comminuting units (e.g. shredding plants), according to the specifications of higher throughput, damping the load peaks arising from the comminuting process and thus also, lowering the voltage fluctuations in the electrical grid. A non-linear SC-control was designed and tested. By this a rotational speed flexible operation of the shredding drive system was realised, so that the rotating masses' kinetic energy is used to smooth the load peak from the process. In this way it was possible to reduce the cumulative load in the drive train, instantaneously achieving high process performance.