How To Use Magnetic Powder Clutch With Tension Controller

Overview of manual tension controller:

In the winding process of many industrial production materials, due to the change in the diameter of the material and other factors, the tension of the material is constantly changing. In order to keep the tension of the material consistent, it is necessary to adjust the resistance moment of the damping device or the winding moment .
At the unwinding end, the tension of the unwinding is determined by the torque of the magnetic powder brake set at the unwinding end. At the rewinding end, the tension of the unwinding is determined by the transmission torque of the magnetic powder clutch. To increase or decrease the transmission torque. The tension control is divided into manual control and automatic control.The manual tension controller, that is, the steady-current power supply, manually adjusts the exciting current of the magnetic powder brake or magnetic powder clutch in stages according to the change in the diameter of the unwinding or receiving coil, so as to obtain a consistent tension.

The so-called tension control is, in popular terms, to be able to control how much force the motor outputs, that is, how many Newtons it outputs. Response to the motor shaft can control the output torque of the motor.

How to control the torque of magnetic powder clutch and brake with high precision?

Magnetic powder clutches and brakes are not only used for low-tension single-axis control, but are also often used in synchronous control of multiple machines with multiple couplings on one machine. The mechanical friction between the shafts and magnetic powder appearing in this control. The characteristics of the clutch and brake are corrected to achieve a stable control effect.


Tension control The tension control system applied to the gravure printing machine is essentially a special follow-up system whose input volume changes according to some adjustable attenuation law. The control of tension can be said to be the core of the whole machine control. As long as the tension control is stable and the tension change is small, the register accuracy and scrap rate of the gravure printing machine can be easily controlled.

The power amplifier is a dedicated power amplifier for controlling the magnetic excitation current of DC24V series magnetic powder brakes, magnetic powder clutches, and miniature magnetic powder brakes using tension control devices such as wires, paper and film making machines. Over constant current control can be used, even if the temperature change of the magnetic powder clutch and brake causes the coil resistance to change. You can also control the output current to a constant shift to make the generated torque constant, thereby achieving stable high-precision control.


The essence of constant tension control with inverter is endless loop vector control, that is, adding encoder feedback. For winding, the winding warp changes from small to large. In order to ensure constant tension, the output torque of the motor is required to change from small to large. At the same time, in different operation processes, corresponding torque compensation should be performed. That is, the moment when the small roll starts, accelerate, decelerate, stop, and when the large roll starts, different torque compensation should be performed during different winding, so that the whole process of winding can be stabilized, and the tension during small rolls can be avoided ; The phenomenon of loose yarn when large rolls are started.

 
Application range
Paper, adhesive tape production, paper processing, wire and cable, printing industry, film, film industry, textile industry, rubber industry, metal foil processing, fiber industry, leather industry, optical fiber manufacturing