Patent ID: 8079539
Filing Date: 2011-12-20
Classification: B65H

Abstract:
1. A built-in module for an inverter and having tension control with integrated tension and velocity closed loops, the tension control module applied to provide a tension control for a winding mechanism which operated by driving at least one motor, the tension control module comprising: a first arithmetic unit receiving an external tension command; a second arithmetic unit receiving an external velocity command; a tension controller electrically connected to the first arithmetic unit to receive a tension force difference and perform a proportional, an integral, and a derivative (PID) operation to the tension force difference to output a torque; a tension feedback calculation unit electrically connected to the first arithmetic unit to receive an angular velocity outputted from the motor and the torque calculated by the tension controller to output a feedback tension force; wherein the tension force difference is obtained by subtracting the feedback tension force from the external tension command through the first arithmetic unit; a third arithmetic unit electrically connected to the tension feedback calculation unit to multiply the feedback tension force outputted from the tension feedback calculation unit by a winding radius of a rotating shaft of the winding mechanism to obtain a resisting torque; a velocity controller electrically connected to the second arithmetic unit to receive a velocity difference and perform a PID operation to the velocity difference to output a compensation torque; wherein the velocity difference is obtained by subtracting the angular velocity from the external velocity command through the second arithmetic unit; and a fourth arithmetic unit electrically connected to the tension controller, the tension feedback calculation unit, the velocity controller, and the third arithmetic unit to obtain a net torque by subtracting the resisting torque from the torque to build a tension control; further the net torque added by the compensation torque to obtain another net torque to build a velocity control; whereby the tension control module firstly builds the tension control to provide a balanced tension to the winding mechanism; afterward, the tension control module builds the velocity control to provide an accelerated or decelerated adjustment for the winding mechanism so that the winding mechanism can stably maintain a tension-balanced operation.