How To Use Magnetic Powder Clutch And Tension Controller

 Manual tension controller overview:

In the winding process of many industrial production materials, the material tension is constantly changing due to the change of the material winding diameter and other factors. In order to keep the tension of the material consistent, it is necessary to adjust the resistance torque or winding torque of the damping device in time. .
At the unwinding end, the tension of the discharge is determined by the torque of the magnetic powder brake provided at the discharge end; at the winding end, the receiving tension is determined by the transmission torque of the magnetic powder clutch, and in order to maintain the uniform tension, the winding diameter must be The size is increased or reduced to transmit 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 excitation current of the magnetic powder brake or the magnetic powder clutch in stages according to the change of the discharge or the receiving coil diameter, thereby obtaining a uniform tension.

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

How can I control the magnetic powder clutch and brake torque with high precision?

Magnetic powder clutches and brakes are not only used for low-tension single-axis control, but also used in multiple multi-axis, synchronous control on one machine, through the mechanical friction between each shaft 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 used in gravure presses is essentially a special follower system in which the input quantity changes according to an 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 color registration accuracy and the reject rate of the gravure printing machine are easily controlled.

The power amplifier uses a tension control device for wires, paper, film manufacturing machines, etc., and controls a DC24V series magnetic powder brake, a magnetic powder clutch, and a dedicated power amplifier for the magnetic excitation current of the micro magnetic powder brake. 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. It is also possible to achieve stable high-precision control by controlling the output current to be a constant duty so that the generated torque is constant.


        The essence of constant tension control with a frequency converter is the dead loop vector control, that is, the encoder feedback. For winding, the winding volume of the winding is changed 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 operating processes, the corresponding torque compensation should be carried out. That is, when the small volume starts, accelerate, decelerate, stop, and when the large volume is started, different torque compensation is performed at different winding times, so that the whole process of winding is stable, and the tension is too large when the small volume is small. The phenomenon of loose yarn when the large roll starts.

 
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, fiber optic manufacturing