The aggressive control plan of the slitter is to use a large motor to drive the rewinding and unwinding shaft. A magnetic powder clutch is added to the rewinding and unwinding shaft, and the resistance generated by the magnetic powder clutch is adjusted to control the tension of the data surface. Magnetic powder clutches and brakes are a special type of automated fulfillment component. The torque transmitted through the magnetic powder filled in the working gap can change the magnetic state of the magnetic powder by changing the magnetic current, and then adjust the transmitted torque. It can be used for stepless speed regulation from zero to synchronous speed. It is suitable for high-speed section fine-tuning and medium and small power speed regulation system. It is also used to adjust the torque by adjusting the current to ensure that the tension during the winding process adheres to a constant unwinding or rewinding tension system.