Loom Warp Feeding Tension Control via Dual Motor Coordination
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Solution Overview
Problem
Existing warp feeding technologies struggle to maintain stable tension during loom operations, particularly when a large tension deviation occurs, leading to hunting issues and prolonged stabilization time due to reliance on single motor control.
Innovation Solution
A method and device that utilize both let-off and take-up motors independently of the main driving motor to control warp tension by comparing detected tension values with reference values, allowing for simultaneous speed adjustments of both motors to quickly stabilize tension, reducing speed changes and hunting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only the let-off motor is controlled to maintain warp tension, then the control system is simple, but the tension stabilization time is prolonged and hunting occurs
Solution Approach 1:
The patent divides the tension control function into two independent segments: one for the let-off motor and one for the take-up motor. Each motor has its own control unit that independently adjusts its rotational speed based on tension deviations, allowing parallel processing of control actions and reducing overall stabilization time without increasing system complexity
2Speed
If the let-off motor speed is greatly increased to eliminate large tension deviation, then the tension is quickly reduced, but the rotational speed cannot be returned to the reference value on time
Solution Approach 1:
The patent applies preliminary action by having the take-up motor control unit anticipate and compensate for the speed changes of the let-off motor. When the let-off motor speed is adjusted to eliminate tension deviation, the take-up motor control unit simultaneously adjusts its speed in the opposite direction, preparing the system to return to the reference rotational speed without delay
Solution Approach 2:
The take-up motor acts as an intermediary element that mediates between the let-off motor's speed changes and the final reference rotational speed. By coordinating its own speed adjustments in response to let-off motor changes, the take-up motor enables smooth transition and timely return to the reference state
3Stress or pressure
If the let-off motor speed is greatly increased to eliminate tension deviation, then the tension is reduced, but the tension exceeds the reference value and increases due to hunting
Solution Approach 1:
The patent implements feedback control where the control units continuously monitor the actual warp tension and compare it with the reference tension value. Based on the deviation, each control unit adjusts its motor's rotational speed in the appropriate direction, creating a closed-loop system that prevents tension from exceeding the reference value and eliminates hunting oscillations
Solution Approach 2:
The patent changes the control parameter from single-motor speed adjustment to coordinated two-motor speed adjustment. By simultaneously adjusting the rotational speeds of both the let-off motor and take-up motor in opposite directions, the system achieves smoother tension control and prevents the hunting phenomenon that occurs with single-motor control
Data Source
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AI summary
A warp feeding method in a loom in which a let-off device (5) and a take-up device (8) have a let-off motor (5c) and a take-up motor (8c) as driving sources, respectively, is provided. The let-off motor (5c) and the take-up motor (8c) are independent of a main driving motor of the loom. The method includes the steps of performing a warp feeding operation by driving the let-off motor (5c) and the take-up motor (8c) while the main driving motor is stopped; during the warp feeding operation, detecting a tension of a warp; comparing a warp tension value that is based on the detection with a previously set reference value of the tension of the warp; and if the warp tension value is not the reference value, performing tension control for returning the tension of the warp to the reference value in accordance with a previously set control mode in which the let-off motor (5c) and the take-up motor (8c) are control objects.