Variable Frequency Drive for wind/unwind applications by Darwin Motion

Posted on 20th Jan 2023

Wind/unwind variable frequency drive of Darwin Motion offers control technology for constant roll-to-roll applications. It is for the handling of a web i.e. paper sheet, film, or other material from the unwinding roll into the winding roll. Furthermore, it features steady winding and unwinding routine, and ease of start-up and modification.

The DR880 is a keen roll-to-roll drive providing dedicated functions. It integrates automatic dancer speed control, automatic winding diameter calculations, and sensor less torque control. It performs quick, smooth, and correct winding/unwinding applications with exact tension feedback. Thus delivering steady and exact control in Variable speed drive wind/unwind applications.

These complex features do not require extra sequence or motion control programming. The DR880 VSD built-in PLC cut down the requirement for a separate controller. It offers simple parameterization to set and improve functions. Evidently, it allows users with no advanced tension control knowledge for controlling winding/unwinding applications.

Variable Frequency Drive wind/unwind applications

By utilizing inverter parameters alone, difficult position control of the dancer roll can be set. A PID control function can be helpful in keeping the dancer roll position and cutting down hunting. Consequently, ensuring effective wind/unwinding applications. PID control utilize feedback from the keen dancer roll position or from the tension sensor. Steady control is probable along with the winding diameter calculation. Furthermore, the VFD automatically sets the ideal PI gain to cut down system start-up time.

Winding diameter recompense function

Controlling torque along with speed permit changes in the winding and unwinding diameter shafts during operation. The current winding unwinding shaft diameter derives from the real line speed or the real motor speed to ensure fast and smooth system setup.

Tension control

Torque needed for deceleration and acceleration and the mechanical loss recompense torque are controlled. Consequently, they preserve material tension continuous and cut down wrinkling or deformations inside the roll.

Gain Compensation and Speed Control

PID control uses the feedback from the noticed dancer roll position or feedback from the tension sensor. Steady control arises along with the winding diameter calculation. What’s more, controlling the speed control relative improvement comparative to winding diameter reply remains continuous.

Tension Sensor Feedback Torque Control

The control features increase the tension control accuracy utilizing feedback from the tension detector. This recompense for mechanical loss owing friction on the winding unwinding shaft and dancer role. Compensating even for faults with the winding diameter or mechanical cut down of aging or temperature. Lastly, wind/unwind keen variable frequency drive models from Darwin Motion are best for splitting, printing, twisting, and coasting applications.

DR880 series drive special function of tension winding process

  • Automatic roll change function
  • Built-in roll diameter calculation
  • Built-in dynamic tension compensation and tension taper function
  • PID high dynamic response characteristics, Reduce downtime and increase unit output, Realize constant tension control and save PLC hardware Cost and software development Realize the smoothness of the rewinding and prevent edge stringing Quickly stabilize the pendulum/tension sensor in the equilibrium position

Darwin Motion

Key Indicators:

  • The quality of the winding material (stable tension, neat end face)
  • Equipment reliability (stable, low failure)
  • Yield rate of winding material

Safe and efficient (unit production capacity e) Simple operation and easy maintenance.