Power
On the basis of the dimensions of the screw, the pitch profile and the product characteristics the
torque and power needed can be determined. Here the difference between a screw feeder and a
transport screw becomes evident. Through the higher filling degree of the screw (beneath the silo
100%, after that at least 80%) and because of the pressure of the product in the silo on the product
in the screw, the torque and power needed is much higher than for a transport screw. in selection
of a drive this is very important.The start-up torque can be estimated on the basis of the silo pressure. it needs to be investigated if
the motor, reductor and frequency regulator can yield this torque. See table below for an example.