SIMO MotorDocument: The torque required on the motor shaft for driving a rolling mill roll consists of four components: rolling torque, additional friction torque, no-load torque, and dynamic torque. Expressed in formula form:

    Total Torque = Rolling Torque + Friction Torque + No-Load Torque + Dynamic Torque

    In this equation, the friction force in the friction torque arises from the rolling bearing, transmission mechanism, and other parts of the rolling mill when the workpiece passes through the rolls; however, the torque required to idle the rolling mill is not included in this friction torque. The no-load torque refers to the torque required to drive the rolling mill under idling conditions. The dynamic torque is the torque on the motor shaft required to overcome inertial forces caused by non-uniform rotation of the rolls.

    Under normal conditions, the rolling torque is the largest. The friction torque and no-load torque depend on the precision of the rolling mill and its components; in actual production, these should be minimized as much as possible.