The main drive motor of extruder is mainly through the parallel shaft helical gear reducer to drive screw's rotation and changes its running speed to constant torque speed under the fundamental frequency.

In the past,  to consider the loaded starting torquethe, it needs to set the corresponding torque to upgrade alignmentthe when we use V/f  control converter in extruder . If the torque's elevation is set to high, the excitation will be too high in light loaded low-frequency which is easy to cause the serious heat of motor to effect the stable operation of equipments.